You searched for subject:(Ground Source Heat Pump GSHP system).
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University of Canterbury
1.
Bustard, Samuel Kent.
A technical and economic feasibility study for the integration of GSHP technology in the Christchurch rebuild.
Degree: Engineering, 2014, University of Canterbury
URL: http://hdl.handle.net/10092/8943 
► Mr Wayne Tobeck, Director of Southrim Group (SRG), sponsored this 2013 MEM Project titled; A Technical and Economic Feasibility Study for the Integration of GSHP…
(more)
▼ Mr Wayne Tobeck, Director of Southrim Group (SRG), sponsored this 2013 MEM Project titled; A Technical and Economic Feasibility Study for the Integration of GSHP Technology in the Christchurch Rebuild.
Following the recent Christchurch earthquakes, a significant amount of land has become too unstable to support traditional building foundations. This creates an opportunity to implement new and unique foundation designs previously unconsidered due to high costs compared to traditional methods.
One such design proposes that an Injection Micro-Piling technique could be used. This can also be coupled with HVAC technology to create a Ground Source Heat Pump (GSHP) arrangement in both new buildings and as retrofits for building requiring foundation repair.
The purpose of this study was to complete a feasibility study on the merits of SRG pursuing this proposed product.
A significant market for such a product was found to exist, while the product was also found to be technically and legally feasible. However, the proposed product was found to not be economically feasible with respect to Air Source Heat Pumps due to the significantly higher capital and installation costs required.
Further analysis suggests GSHPs may become more economically attractive in operating temperatures lower than -9 °C, though the existence of markets with this climate in NZ has not been studied.
It is therefore suggested that SRG do not proceed with plans to develop a GSHP coupled foundation solution for the Christchurch rebuild.
Subjects/Keywords: GSHP; Ground Source Heat Pump; Geothermal Heat Pump; GHP; HVAC; Renewable Energy; Geothermal Energy
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APA (6th Edition):
Bustard, S. K. (2014). A technical and economic feasibility study for the integration of GSHP technology in the Christchurch rebuild. (Thesis). University of Canterbury. Retrieved from http://hdl.handle.net/10092/8943
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bustard, Samuel Kent. “A technical and economic feasibility study for the integration of GSHP technology in the Christchurch rebuild.” 2014. Thesis, University of Canterbury. Accessed December 14, 2019.
http://hdl.handle.net/10092/8943.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bustard, Samuel Kent. “A technical and economic feasibility study for the integration of GSHP technology in the Christchurch rebuild.” 2014. Web. 14 Dec 2019.
Vancouver:
Bustard SK. A technical and economic feasibility study for the integration of GSHP technology in the Christchurch rebuild. [Internet] [Thesis]. University of Canterbury; 2014. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10092/8943.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bustard SK. A technical and economic feasibility study for the integration of GSHP technology in the Christchurch rebuild. [Thesis]. University of Canterbury; 2014. Available from: http://hdl.handle.net/10092/8943
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Halmstad University
2.
Sharma, Prajesh.
Potential of Geothermal Energy in India.
Degree: Engineering and Science, 2019, Halmstad University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40524
► In this research paper, review of world geothermal energy production and their capacity is shown. Here, a research is conducted to know the potential…
(more)
▼ In this research paper, review of world geothermal energy production and their capacity is shown. Here, a research is conducted to know the potential and possibility of geothermal energy in India. All the geothermal province with their geographical locations are shown and a brief calculation is conducted in order to show the potential of the particular province. As India is having the low temperature geothermal fields, binary geothermal plants are used for this analysis and results are calculated by using R134a as a working fluid at different temperatures. The results are sufficient to prove the potential of geothermal energy in India. Importance of Ground Source Heat Pump (GSHP) and power savings by its contribution over traditional heating and cooling methods is shown statistically. 9 different states of India are divided by their climatic condition, severe winter and moderate winter to calculate the heat demand in those states. Also, for the cold demands these states are considered to be same as per the climatic situation in summer. Then, comparison is done between GSHP and the traditional heating and cooling systems. The result shows the drastic power saving by using GSHP for space heating as well as cooling, over electric heater and air conditioner respectively.
Subjects/Keywords: Geothermal energy; Ground Source Heat Pump (GSHP); Renewable Energy; Power saving; Power generation; Energy Systems; Energisystem
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APA (6th Edition):
Sharma, P. (2019). Potential of Geothermal Energy in India. (Thesis). Halmstad University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40524
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sharma, Prajesh. “Potential of Geothermal Energy in India.” 2019. Thesis, Halmstad University. Accessed December 14, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40524.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sharma, Prajesh. “Potential of Geothermal Energy in India.” 2019. Web. 14 Dec 2019.
Vancouver:
Sharma P. Potential of Geothermal Energy in India. [Internet] [Thesis]. Halmstad University; 2019. [cited 2019 Dec 14].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40524.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sharma P. Potential of Geothermal Energy in India. [Thesis]. Halmstad University; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40524
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Ryerson University
3.
Nguyen, Hiep Van.
Analysis of the factors affecting hybrid ground-source heat pump installation potential.
Degree: 2014, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A2722
► A series of sensitivity analysis was performed to a variety of design parameters as a way of increasing the knowledge base of automatically sizing GSHPs…
(more)
▼ A series of sensitivity analysis was performed to a variety of design parameters as a way of increasing the knowledge base of automatically sizing GSHPs as a component of a hybrid system. The present work investigates the effects of geographical location (weather patterns and utility rates), operating costs (fixed vs. time-of-use rates), inflation rates, the control strategies used, project life, heat pump entering fluid temperature (EFT), carbon taxation, and building retrofit on the sizing of hybrid GSHP systems in North America. Based on an economic approach to sizing hybrid GSHP systems by selecting the most economical design (based on minimizing the net present value of capital and operating costs), significant energy and cost savings and reductions in CO2 emissions can be achieved.
Subjects/Keywords: Ground source heat pump systems.
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APA (6th Edition):
Nguyen, H. V. (2014). Analysis of the factors affecting hybrid ground-source heat pump installation potential. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A2722
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nguyen, Hiep Van. “Analysis of the factors affecting hybrid ground-source heat pump installation potential.” 2014. Thesis, Ryerson University. Accessed December 14, 2019.
https://digital.library.ryerson.ca/islandora/object/RULA%3A2722.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nguyen, Hiep Van. “Analysis of the factors affecting hybrid ground-source heat pump installation potential.” 2014. Web. 14 Dec 2019.
Vancouver:
Nguyen HV. Analysis of the factors affecting hybrid ground-source heat pump installation potential. [Internet] [Thesis]. Ryerson University; 2014. [cited 2019 Dec 14].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2722.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nguyen HV. Analysis of the factors affecting hybrid ground-source heat pump installation potential. [Thesis]. Ryerson University; 2014. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2722
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
De Montfort University
4.
Naicker, Selvaraj Soosaiappa.
Performance analysis of a large-scale ground source heat pump system.
Degree: PhD, 2015, De Montfort University
URL: http://hdl.handle.net/2086/12265
► The UK government’s Carbon Plan-2011 aims for 80% carbon emission reduction by 2050, and the 2009 UK National Renewable Energy Action Plan has set a…
(more)
▼ The UK government’s Carbon Plan-2011 aims for 80% carbon emission reduction by 2050, and the 2009 UK National Renewable Energy Action Plan has set a target of delivering 15% of total energy demand by renewable energy sources by 2020. Ground Source Heat Pump (GSHP) systems can play a critical role in reaching these goals within the building sector. Achieving such benefits relies on proper design, integration, installation, commissioning, and operation of these systems. This work seeks to provide evidence to improve the practices in design, installation and operations of large GSHP systems. This evidence has been based on collection and analysis of data from an operational large-scale GSHP system providing heating and cooling to a university building. The data set is of significance in that it is collected from a large-scale system incorporating fifty-six borehole heat exchangers and four heat pumps. The data has been collected at high frequency since the start of operation and for a period of three years. The borehole heat exchanger data is intended to form a reference data set for use by other workers in model validation studies. The ground thermal properties at the site have been estimated using a novel combination of numerical model and parameter estimation methods. The utility of the reference data set has been demonstrated through application in a validation study of a numerical borehole heat exchanger model. The system heat balances and power consumption data have firstly been analysed to derive a range of performance metrics such as Seasonal Performance Factors. Analysis has been carried out at the system and individual heat pump level. Annual performance has been found satisfactory overall. A series of analyses have been carried out to investigate the roles of circulating pump energy, control system operation and dynamic behaviour. Monitoring data from one of the heat pumps has also been analysed in further detail to make comparisons with manufacturer’s steady-state performance data and with consideration to variations in fluid properties. Some modest degradation from stated performance has been identified. The most significant operational factors accounting for degradation of overall system performance have been excessive pump energy demands and short cycling behaviour. Some faults in operation of the system during the monitoring period have also been identified. A series of recommendations are made as to ways to improve the design and operation of large-scale GSHP systems based on this evidence. These recommendations are chiefly concerned with better design for part-load operation, reduction in pump energy demands and more robust control systems.
Subjects/Keywords: 697; Ground Source Heat Pump (GSHP) system; Borehole Heat Exchanger (BHE); Thermal Response Test (TRT); Reference data set; Monitoring and Performance Analysis; Seasonal Performance Factor (SPF); Co-efficient of Performance (COP)
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APA ·
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APA (6th Edition):
Naicker, S. S. (2015). Performance analysis of a large-scale ground source heat pump system. (Doctoral Dissertation). De Montfort University. Retrieved from http://hdl.handle.net/2086/12265
Chicago Manual of Style (16th Edition):
Naicker, Selvaraj Soosaiappa. “Performance analysis of a large-scale ground source heat pump system.” 2015. Doctoral Dissertation, De Montfort University. Accessed December 14, 2019.
http://hdl.handle.net/2086/12265.
MLA Handbook (7th Edition):
Naicker, Selvaraj Soosaiappa. “Performance analysis of a large-scale ground source heat pump system.” 2015. Web. 14 Dec 2019.
Vancouver:
Naicker SS. Performance analysis of a large-scale ground source heat pump system. [Internet] [Doctoral dissertation]. De Montfort University; 2015. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/2086/12265.
Council of Science Editors:
Naicker SS. Performance analysis of a large-scale ground source heat pump system. [Doctoral Dissertation]. De Montfort University; 2015. Available from: http://hdl.handle.net/2086/12265
University of British Columbia
5.
Hanova, Jana.
Environmental and techno-economic analysis of ground source heat pump systems
.
Degree: 2008, University of British Columbia
URL: http://hdl.handle.net/2429/1610
► Climate change stabilization requires an unprecedented effort to change our current approach to energy production and consumption. While rising energy prices are drawing increased attention…
(more)
▼ Climate change stabilization requires an unprecedented effort to change our current approach to energy production and consumption. While rising energy prices are drawing increased attention to reducing energy demand, heightened concern about the environmental consequences of fuel choice requires that this demand be met at lower emission levels. In Canada, the realization of commitments to our GHG emission goals entails reducing residential energy use - a sector responsible for close to 20 percent of end-use energy consumption. This study focuses on the energy demand and emission levels of space and water heating, since these two components comprise 76 percent of residential energy demand.
Ground source heat pumps (GSHPs) are a technology that provides heating at 25 to 30 percent of the energy consumed by even the most efficient conventional alternatives. GSHPs have been identified as the most energy-efficient, environmentally clean, and cost-effective space conditioning systems available. However, their drawbacks have been high capital costs, and uncertainty about whether the electric power used by heat pumps has higher system-wide emissions.
This thesis delineates how adoption of GSHPs in the residential sector can help align Canada’s technology choices with commitments made to the Kyoto Protocol. The manuscripts delineate conditions under which GSHP systems achieve the largest net emission reductions relative natural gas, heating oil, and electric heat counterparts. Electricity generation methods and emissions embodied in inter-provincial and international electricity trade are shown to significantly affect the emission savings achievable through GSHP. The thesis quantifies how relative fuel prices influence annual operating savings that determine how rapidly the technology can achieve payback. This analysis reveals GSHPs to hold significant potential for substantial GHG reductions at a cost savings relative to conventional alternatives; the time horizons for payback are as short as nine years for average-sized homes, and significantly shorter for larger homes.
Subjects/Keywords: Ground source heat pump;
GHG emissions;
GSHP;
HVAC;
Heating;
Environment
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APA ·
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Manager
APA (6th Edition):
Hanova, J. (2008). Environmental and techno-economic analysis of ground source heat pump systems
. (Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/1610
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hanova, Jana. “Environmental and techno-economic analysis of ground source heat pump systems
.” 2008. Thesis, University of British Columbia. Accessed December 14, 2019.
http://hdl.handle.net/2429/1610.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hanova, Jana. “Environmental and techno-economic analysis of ground source heat pump systems
.” 2008. Web. 14 Dec 2019.
Vancouver:
Hanova J. Environmental and techno-economic analysis of ground source heat pump systems
. [Internet] [Thesis]. University of British Columbia; 2008. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/2429/1610.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hanova J. Environmental and techno-economic analysis of ground source heat pump systems
. [Thesis]. University of British Columbia; 2008. Available from: http://hdl.handle.net/2429/1610
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
6.
Mays, Cristin Jean.
Ground-coupled heat pump systems: a pumping analysis.
Degree: MS, Department of Architectural
Engineering, 2012, Kansas State University
URL: http://hdl.handle.net/2097/15099
► Ground-coupled heat pump (GCHP) systems use the ground as a heat source or sink that absorbs heat from or rejects heat to the soil, respectively;…
(more)
▼ Ground-coupled
heat pump (GCHP) systems use the
ground
as a
heat source or sink that absorbs
heat from or rejects
heat to
the soil, respectively; this is referred to as the geothermal
heat
exchanger. Apart from the geothermal
heat exchanger, there are two
other main
system components that make up a GCHP
system:
heat pumps
and circulation pumps. This report studies four GCHP pumping
systems and makes comparisons between the four using life-cycle
cost analyses for six building models. The goal for this analysis
was to discover commonalities between the models in order to
provide designers insight into which pumping
system is the most
cost effective.
The analysis was performed by first creating
energy models to obtain
system and zone load information, as well
as
system part-load data and geothermal
heat exchanger performance.
From the zone load information,
heat pump selections were then
performed to indicate the worst case piping path that is required
for
pump head calculations. Piping layouts were created to
establish pipe lengths for the
pump head calculations as well.
Other piping components such as valves and fittings and the air
separator pressure drops were also calculated. Once the
pump head
calculations were complete for each
system,
pump schedules were
created. From there initial unit and installation costs were
determined for each
pump, as well as their replacement costs. The
part-load data from the energy models were then used to obtain
annual
pump energy consumption and
pump utility cost. Finally,
assumptions were made to establish regular and preventative
maintenance requirements for each pumping
system.
Initial and
replacement unit costs, annual utility cost and regular and
preventative maintenance costs were the components used in the
life-cycle cost analysis. Each of these components was converted to
30-year projected costs and added to create a total life-cycle cost
for each pumping
system. Comparisons were then made and the results
showed that a primary pumping
system with VFD control and 100%
redundancy was the most cost effective
system. However, there are
other considerations such as controllability, flexibility and
availability that might persuade designers to choose one of the
other alternate solutions.
Advisors/Committee Members: Fred Hasler.
Subjects/Keywords: Ground-coupled; Heat
pump; Pumping
system;
HVAC;
Ground-source;
Distributive; Architectural engineering (0462)
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APA (6th Edition):
Mays, C. J. (2012). Ground-coupled heat pump systems: a pumping analysis. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/15099
Chicago Manual of Style (16th Edition):
Mays, Cristin Jean. “Ground-coupled heat pump systems: a pumping analysis.” 2012. Masters Thesis, Kansas State University. Accessed December 14, 2019.
http://hdl.handle.net/2097/15099.
MLA Handbook (7th Edition):
Mays, Cristin Jean. “Ground-coupled heat pump systems: a pumping analysis.” 2012. Web. 14 Dec 2019.
Vancouver:
Mays CJ. Ground-coupled heat pump systems: a pumping analysis. [Internet] [Masters thesis]. Kansas State University; 2012. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/2097/15099.
Council of Science Editors:
Mays CJ. Ground-coupled heat pump systems: a pumping analysis. [Masters Thesis]. Kansas State University; 2012. Available from: http://hdl.handle.net/2097/15099
Oklahoma State University
7.
Xing, Lu.
Estimations of Undisturbed Ground Temperatures Using Numerical and Analytical Modeling.
Degree: Mechanical Engineering, 2014, Oklahoma State University
URL: http://hdl.handle.net/11244/15208
► The interaction of buildings and ground source heat pump systems with the surrounding ground is quite important for design and energy calculation procedures. Building design…
(more)
▼ The interaction of buildings and
ground source heat pump systems with the surrounding
ground is quite important for design and energy calculation procedures. Building design load calculations, building energy calculations,
ground heat exchangers design and design and energy analyses of district heating and cooling systems often require as inputs the undisturbed
ground temperatures.Currently, the available undisturbed
ground temperatures are rather limited. In the U.S., the
ground temperatures are usually represented with a three-parameter one-harmonic model. The model parameters for the continental US or North America are presented in maps in the ASHRAE handbooks. The results presentation in small maps can be quite difficult to read for a specific location. Furthermore, the sources of some results are unknown, and where the
source is known, the results were published more than half a century ago. ASHRAE district heating manual also published a world-wide data set presented in one-harmonic model with model parameters presented in tables. However, the data are computed based on a simplified approximation that the
ground surface temperature is equal to the air temperature; this approximation can lead to significant error in the cold climates and arid climates.Therefore, the main objective of this research is to provide a new set of
ground temperature estimates for use by engineers. A numerical model and a simplified design model have been developed for the estimations of the typical year
ground temperature and maximum/minimum
ground temperatures of multiple years. Both models have been validated against the experimental results. The validated numerical model will be run with 1020 TMY3 weather files in the U.S., 80 CWEC weather files in Canada and 3012 IWEC-2 weather files around the world. The simplified design model relies on empirical parameters to estimate the
ground temperatures. Therefore, the numerical model results will be used to generate parameters for the design model. Two sets of
ground temperature estimates approximated for with two different earth surface conditions will be developed; these two earth surface conditions are short grass, tall grass. These
ground temperatures are presented in a two-harmonic form using parameters estimated from the numerical model results.
Advisors/Committee Members: Spitler, Jeffrey D. (advisor), Fisher, Daniel E. (committee member), Ghajar, Afshin J. (committee member), Beier, Richard A. (committee member).
Subjects/Keywords: analytical model; building energy; ground source heat pump system; ground temperatures; numerical model; worldwide map
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Manager
APA (6th Edition):
Xing, L. (2014). Estimations of Undisturbed Ground Temperatures Using Numerical and Analytical Modeling. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/15208
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Xing, Lu. “Estimations of Undisturbed Ground Temperatures Using Numerical and Analytical Modeling.” 2014. Thesis, Oklahoma State University. Accessed December 14, 2019.
http://hdl.handle.net/11244/15208.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Xing, Lu. “Estimations of Undisturbed Ground Temperatures Using Numerical and Analytical Modeling.” 2014. Web. 14 Dec 2019.
Vancouver:
Xing L. Estimations of Undisturbed Ground Temperatures Using Numerical and Analytical Modeling. [Internet] [Thesis]. Oklahoma State University; 2014. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/11244/15208.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Xing L. Estimations of Undisturbed Ground Temperatures Using Numerical and Analytical Modeling. [Thesis]. Oklahoma State University; 2014. Available from: http://hdl.handle.net/11244/15208
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Karlstad University
8.
Denker, Richard.
Dimensioning and control for heat pump systems using a combination of vertical and horizontal ground-coupled heat exchangers.
Degree: Engineering and Physics, 2015, Karlstad University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36475
► A model has been developed which simulates a system consisting of a horizontal and vertical ground-coupled heat exchanger connected in parallel to the same…
(more)
▼ A model has been developed which simulates a system consisting of a horizontal and vertical ground-coupled heat exchanger connected in parallel to the same heat pump. The model was used in computer simulations to investigate how the annual minimum and mean fluid temperatures at the heat pump varied as several parameters of the combined system were changed. A comparison was also made between different control settings for fluid flow rate distribution between the two exchangers. For the case when the flow rate distribution was not controlled, the effect of viscosity differences between a colder and warmer exchanger was investigated. The short term effects of letting the vertical heat source rest during the warm summer months was then tested. Lastly, the results of the model was compared to a simple 'rule of thumb' that have been used in the industry for this kind of combined system. The results show that using a combined system might not always result in increased performance, if the previously existing exchanger is a vertical ground-coupled heat exchanger. The effects of viscosity differences on the flow distribution seems to be negligible, especially for high net flows. Controlling the fluid flow rates seems to only be worth the effort if the the pipe lengths of the two combined exchangers differ heavily. Letting the vertical ground-coupled heat exchanger rest during summer was shown to in some cases yield an increased short-term performance in addition to the already known positive long term effects. The rule of thumb was shown to recommend smaller dimensions for combination systems than the more realistic analytical model.
Subjects/Keywords: heat pump system; ground-coupled; ground source; combination; dual; horizontal; vertical; borehole heat exchanger; BHE; complementary source; flow control
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APA ·
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Manager
APA (6th Edition):
Denker, R. (2015). Dimensioning and control for heat pump systems using a combination of vertical and horizontal ground-coupled heat exchangers. (Thesis). Karlstad University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36475
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Denker, Richard. “Dimensioning and control for heat pump systems using a combination of vertical and horizontal ground-coupled heat exchangers.” 2015. Thesis, Karlstad University. Accessed December 14, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36475.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Denker, Richard. “Dimensioning and control for heat pump systems using a combination of vertical and horizontal ground-coupled heat exchangers.” 2015. Web. 14 Dec 2019.
Vancouver:
Denker R. Dimensioning and control for heat pump systems using a combination of vertical and horizontal ground-coupled heat exchangers. [Internet] [Thesis]. Karlstad University; 2015. [cited 2019 Dec 14].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36475.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Denker R. Dimensioning and control for heat pump systems using a combination of vertical and horizontal ground-coupled heat exchangers. [Thesis]. Karlstad University; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36475
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
9.
Thompson III, Willis Hope.
Numerical Analysis of Thermal Behavior and Fluid Flow in Geothermal Energy Piles.
Degree: MS, Mechanical Engineering, 2013, Virginia Tech
URL: http://hdl.handle.net/10919/24013
► Geothermal heat exchangers are a growing energy technology that improve the energy efficiency of heating and cooling systems in buildings. Vertical borehole heat exchangers (BHE)…
(more)
▼ Geothermal
heat exchangers are a growing energy technology that improve the energy efficiency of heating and cooling systems in buildings. Vertical borehole
heat exchangers (BHE) coupled with
ground source heat pumps have been widely developed and researched in the past century. The major disadvantage of BHEs is the initial capital cost required to drill the boreholes. Geothermal energy piles (GEP) were developed to help offset the high initial cost of these systems. A GEP combines
ground source heat pump technology with deep earth structural foundations of buildings. GEPs are relatively new technology and robust standards and guidelines have not yet been developed for the design of these systems. The main operational difference between GEPs and conventional BHEs is the length and diameter of the below
ground heat exchangers. The diameter of a GEP is much larger and the length is typically shorter than BHEs. Computational fluid dynamics (CFD) analysis is used in this study to investigate and better understand how structural piles perform as geothermal
heat exchangers.
The CFD analysis is used to simulate an existing experimental energy pile test. The experimental test is modeled as built including fluid modeling to provide additional detail into the behavior of the circulation fluid within the pile. Two comparisons of large diameter GEPs are made using CFD analysis to gain knowledge of the effects of varying pile diameter and loop configuration. The thermal response test was successfully modeled using the CFD model. The CFD results closely match the results of the field test. The large diameter comparisons show that the performance of an energy pile will increase as the diameter increases with a constant loop density. Multiple numbers of loops were tested in a constant diameter pile and the results show that with symmetrically placed loops the performance will increase with a greater number of loops in the pile.
Advisors/Committee Members: Ekkad, Srinath V. (committeechair), Olgun, Celal Guney (committee member), Wheeler, Joseph H. (committee member), Ellis, Michael W. (committee member).
Subjects/Keywords: Geothermal Energy Pile; Ground Source Heat Pump
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APA (6th Edition):
Thompson III, W. H. (2013). Numerical Analysis of Thermal Behavior and Fluid Flow in Geothermal Energy Piles. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/24013
Chicago Manual of Style (16th Edition):
Thompson III, Willis Hope. “Numerical Analysis of Thermal Behavior and Fluid Flow in Geothermal Energy Piles.” 2013. Masters Thesis, Virginia Tech. Accessed December 14, 2019.
http://hdl.handle.net/10919/24013.
MLA Handbook (7th Edition):
Thompson III, Willis Hope. “Numerical Analysis of Thermal Behavior and Fluid Flow in Geothermal Energy Piles.” 2013. Web. 14 Dec 2019.
Vancouver:
Thompson III WH. Numerical Analysis of Thermal Behavior and Fluid Flow in Geothermal Energy Piles. [Internet] [Masters thesis]. Virginia Tech; 2013. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10919/24013.
Council of Science Editors:
Thompson III WH. Numerical Analysis of Thermal Behavior and Fluid Flow in Geothermal Energy Piles. [Masters Thesis]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/24013
10.
Σαγιά, Ζωή.
Heat transfer computational methods which can also be applied to geothermal field of study for energy saving and environmental benefits.
Degree: 2012, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)
URL: http://hdl.handle.net/10442/hedi/31687
► The current work is focused on the Ground Source Heat Pump Systems (GSHPSs) coupled to closed vertical ground loop. Several factors that affect the system’s…
(more)
▼ The current work is focused on the Ground Source Heat Pump Systems (GSHPSs) coupled to closed vertical ground loop. Several factors that affect the system’s performance are examined. Two different approaches are developed. In the first one, an overall view of system’s performance is studied using GLD 2009, GLHEPRO 4.0a and TRNSYS 17. The system is examined as a total of unbreakably connected parts. A parametric analysis is performed to examine the influence of undisturbed ground temperature, Ground Heat Exchanger (GHE) length and borehole separation distance to system’s operational characteristics, so as to cover given building loads. In the second one, the operation of parts is examined independently of the system. The borehole thermal resistance is examined through different types of analysis such as analytical correlations, commercial software GLD 2009 and 2-D finite element analysis through COMSOL 4.0a. Despite the different type of analysis, the deviations are small and that is why borehole thermal resistance output values are considered satisfactory. In addition, MATLAB codes are built to simulate the operation of heat pump and open circuit cooling tower that may be included in a Hybrid Ground Source Heat Pump System (HGSHPS). By studying heat pump’s refrigeration cycle, alternative refrigerant mixtures to R-410A are proposed. Furthermore, the performance of cooling tower is evaluated with the ratio pressure drop per packing height for four packings. The results are generally applicable to the estimation of the performance of these devices and not restricted only to geothermal applications. Moreover, a HGSHPS coupled to a closed circuit cooling tower is studied. A new strategy is developed to control this system so as to minimize its electric power consumption. Despite the fact that it is designed considering only the net cooling period, it is a well-promising policy because it is based on the continuous monitoring of system’s previous hourly state, so as to adjust its operation to the following hour (feedback).
Η παρούσα εργασία επικεντρώνεται στα συστήματα αβαθούς γεωθερμίας που έχουν κατακόρυφο κλειστό κύκλωμα γεωεναλλακτών. Πολλοί παράγοντες που επηρεάζουν την απόδοση του συστήματος εξετάζονται. Δύο διαφορετικές προσεγγίσεις αναπτύσσονται. Με την πρώτη, η απόδοση του συστήματος εξετάζεται συνολικά χρησιμοποιώντας τα λογισμικά GLD 2009, GLHEPRO 4.0a και TRNSYS 17. Το σύστημα εξετάζεται ως ένα σύνολο από αναπόσπαστα συνδεδεμένα τμήματα. Μια παραμετρική ανάλυση εκτελείται για να μελετηθεί η επίδραση της αδιατάρακτης θερμοκρασίας του εδάφους, του μήκους του γεωεναλλάκτη και της απόστασης των γεωτρήσεων στα λειτουργικά χαρακτηριστικά του συστήματος έτσι ώστε να καλυφθούν τα δεδομένα φορτία του κτηρίου. Με τη δεύτερη, η λειτουργία των τμημάτων του συστήματος εξετάζεται ανεξάρτητα. Η θερμική αντίσταση της γεώτρησης μελετάται με διαφορετικά είδη ανάλυσης όπως με αναλυτικές σχέσεις, με το εμπορικό λογισμικό GLD 2009 και με μια δισδιάστατη ανάλυση πεπερασμένων στοιχείων μέσω του COMSOL 4.0a. Παρά τα διαφορετικά…
Subjects/Keywords: Γεωεναλλάκτης; Γεώτρηση; Αντλία θερμότητας; Ψυκτικός πύργος; Σύστημα αβαθούς γεωθερμίας; Υβριδικό σύστημα; Στρατηγική ελέγχου; Γεωθερμική ενέργεια; Ground heat exchanger; Boreholes; Heat pump; Cooling towers; Ground source heat pump systems; Hybrid ground source heat pump system; Control strategy; Geothermal energy
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APA (6th Edition):
Σαγιά, . . (2012). Heat transfer computational methods which can also be applied to geothermal field of study for energy saving and environmental benefits. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/31687
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Σαγιά, Ζωή. “Heat transfer computational methods which can also be applied to geothermal field of study for energy saving and environmental benefits.” 2012. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed December 14, 2019.
http://hdl.handle.net/10442/hedi/31687.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Σαγιά, Ζωή. “Heat transfer computational methods which can also be applied to geothermal field of study for energy saving and environmental benefits.” 2012. Web. 14 Dec 2019.
Vancouver:
Σαγιά . Heat transfer computational methods which can also be applied to geothermal field of study for energy saving and environmental benefits. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10442/hedi/31687.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Σαγιά . Heat transfer computational methods which can also be applied to geothermal field of study for energy saving and environmental benefits. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. Available from: http://hdl.handle.net/10442/hedi/31687
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Ryerson University
11.
Alzahrani, Waleed, S.
Experimental study of the performance of a vertical and a horizontal ground loops coupled to a ground source heat pump system:.
Degree: 2014, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A2613
► The performance of vertical and horizontal ground loops coupled to a Ground-Source Heat Pump (GSHP) was investigated under four different scenarios. For this purpose, an…
(more)
▼ The performance of vertical and horizontal
ground loops coupled to a
Ground-
Source Heat Pump (
GSHP) was investigated under four different scenarios. For this purpose, an experimental set-up was designed and constructed at the Archetype Sustainable houses in Vaughan, Ontario, Canada. In the first two tests, the two vertical
ground loops coupled to the
GSHP were tested in heating, and cooling modes. In heating mode, the
GSHP COP ranged between 2.7 and 3.15. In cooling mode, the
GSHP performed better than the heating mode with COP range of 3.75 and 5.4. In the last two tests, two scenarios were tested to compare the horizontal and the vertical
ground loops in cooling mode. In the first scenario, the
ground loop flow was divided equally between the loops and the
GSHP overall COP was 5.42. The last test used equal Reynolds number in both loops and the
GSHP overall COP was 5.36.
Advisors/Committee Members: Ryerson University (Degree grantor).
Subjects/Keywords: Heat pumps – Efficiency; Heat pumps – Efficiency – -; Ground source heat pump systems; Ground source heat pump systems – -
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APA (6th Edition):
Alzahrani, Waleed, S. (2014). Experimental study of the performance of a vertical and a horizontal ground loops coupled to a ground source heat pump system:. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A2613
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Alzahrani, Waleed, S. “Experimental study of the performance of a vertical and a horizontal ground loops coupled to a ground source heat pump system:.” 2014. Thesis, Ryerson University. Accessed December 14, 2019.
https://digital.library.ryerson.ca/islandora/object/RULA%3A2613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alzahrani, Waleed, S. “Experimental study of the performance of a vertical and a horizontal ground loops coupled to a ground source heat pump system:.” 2014. Web. 14 Dec 2019.
Vancouver:
Alzahrani, Waleed S. Experimental study of the performance of a vertical and a horizontal ground loops coupled to a ground source heat pump system:. [Internet] [Thesis]. Ryerson University; 2014. [cited 2019 Dec 14].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2613.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alzahrani, Waleed S. Experimental study of the performance of a vertical and a horizontal ground loops coupled to a ground source heat pump system:. [Thesis]. Ryerson University; 2014. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2613
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oklahoma State University
12.
Cullin, James Robert.
Advancements in the Simulation of Ground Source Heat Pump Systems.
Degree: Mechanical Engineering, 2014, Oklahoma State University
URL: http://hdl.handle.net/11244/14786
► With ground source heat pump systems becoming an increasing focus in the building energy efficiency sector, fully understanding their behavior is key. For systems such…
(more)
▼ With
ground source heat pump systems becoming an increasing focus in the building energy efficiency sector, fully understanding their behavior is key. For systems such as these, computer simulation is typically performed to design them, or to examine their potential energy performance. Therefore, having detailed simulations that take into account all relevant behaviors of these systems is of the utmost importance.After discussing the current state of
ground source heat pump system simulation, a first-order analysis shows that the horizontal piping in a vertical borehole
system can play a very significant effect on the overall performance, and that the selection of the design temperatures can influence the long-term behavior of the
system. To further delve into particular aspects of
ground source heat pump behavior, a new, detailed model is developed that focuses much computational effort on the area surrounding the borehole, which possesses the highest temperature gradient and therefore the highest
heat transfer rate.The new model, as well as a widely-used existing model, are then validated against multiple experimental data sets. This validation shows that the new model performs well for smaller systems, but struggles when the number of boreholes increases due to computation time. Meanwhile, the existing model performs well for typical systems of all sizes; where it fails, though, is in failing to account for thermal short-circuiting inside the borehole, which becomes significant as the fluid residence time grows.Finally, two notable design methodologies are also validated. One, a simulation-based standalone design tool, sizes systems very accurately, and the error falls within the range attributable to not using a more detailed hourly simulation. On the other hand, the current ASHRAE Handbook design equation fails to predict the lengths with any accuracy; this is predominantly due to the simplistic nature in which it represents the building loads.
Advisors/Committee Members: Spitler, Jeffrey D. (advisor), Fisher, Daniel E. (committee member), Ghajar, Afshin J. (committee member), Beier, Richard A. (committee member).
Subjects/Keywords: geothermal; ground source heat pump; heat exchanger; heat transfer; numerical modeling
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APA ·
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APA (6th Edition):
Cullin, J. R. (2014). Advancements in the Simulation of Ground Source Heat Pump Systems. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/14786
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cullin, James Robert. “Advancements in the Simulation of Ground Source Heat Pump Systems.” 2014. Thesis, Oklahoma State University. Accessed December 14, 2019.
http://hdl.handle.net/11244/14786.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cullin, James Robert. “Advancements in the Simulation of Ground Source Heat Pump Systems.” 2014. Web. 14 Dec 2019.
Vancouver:
Cullin JR. Advancements in the Simulation of Ground Source Heat Pump Systems. [Internet] [Thesis]. Oklahoma State University; 2014. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/11244/14786.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cullin JR. Advancements in the Simulation of Ground Source Heat Pump Systems. [Thesis]. Oklahoma State University; 2014. Available from: http://hdl.handle.net/11244/14786
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
13.
Blair, Jacob Dale.
Development of an integrated building load and ground source heat pump model to assess heat pump and ground loop design and performance in a commercial office building.
Degree: MSin Engineering, Mechanical Engineering, 2014, University of Texas – Austin
URL: http://hdl.handle.net/2152/26320
► Ground source heat pumps (GSHPs) offer an efficient method for cooling and heating buildings, reducing energy usage and operating cost. In hot, arid regions such…
(more)
▼ Ground source heat pumps (GSHPs) offer an efficient method for cooling and heating buildings, reducing energy usage and operating cost. In hot, arid regions such as Texas and the southwest United States, building load imbalance towards cooling causes design and performance challenges to
GSHP systems in residential and commercial building applications.
An integrated building load and
GSHP model is developed in this thesis to test approaches to reduce
GSHP cost, to properly size
ground heat exchanger (GHEX) installations and to offer methods to improve
GSHP performance in commercial buildings. The integrated model is comprised of a three-story office building,
heat pumps, air handling
system and a GHEX. These component models were integrated in the Matlab® Simulink® modeling environment, which allows for easy model modification and expansion.
The building-load model was developed in HAMBASE, which simulates the thermal and hygric response of each zone in the building to external weather and internal loads. The building-load model was validated using the ASHRAE 140-2007 Standard Method of Test and with results from EnergyPlus. The
heat pump model was developed as a performance map, based on data commonly provided by
heat pump manufacturers. This approach allows for easy expansion of the number and type of
heat pump models supported. The GHEX model was developed at Oklahoma State University and is based on Eskilson’s g-function model of vertical borehole operation. The GHEX model accurately represents the interaction between boreholes and the
ground temperature response over short and long time-intervals. The GHEX model uses GLHEPRO files for parameter inputs.
Long time-interval simulations of the integrated model are provided to assess the sensitivity of the
GSHP system to various model parameters. These studies show that: small changes in the total GHEX length reduce
system cost with minimal impact on performance; increased borehole spacing improves
system performance with no additional cost; supplemental
heat rejection reduces installation costs and improves
system performance; industry-recommended design cutoff temperatures properly size the GHEX
system; and, while cooling is the greatest contributor to operating cost in the southwest and southcentral United States, heating is the limiting design case for GHEX sizing.
Advisors/Committee Members: Masada, Glenn Y. (advisor), Moon, T. J. (Tess J.) (advisor).
Subjects/Keywords: Ground source heat pump; Building climate model; Supplemental heat rejection; GSHP; SHR; GHEX
…318
xvii
List of Figures
Figure 1: Ground-source heat pump schematic for summer operation… …x28;cooling mode) ..... 2
Figure 2: Ground-source heat pump schematic for winter… …variation for San Antonio, TX
(International Ground Source Heat Pump Association, 2009, pp. 1… …10
2.2. Modeling a Water-Source Heat Pump… …178
Table 58: Ground loop specifications for heat pump EWT design cutoff temperature
test…
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APA ·
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APA (6th Edition):
Blair, J. D. (2014). Development of an integrated building load and ground source heat pump model to assess heat pump and ground loop design and performance in a commercial office building. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/26320
Chicago Manual of Style (16th Edition):
Blair, Jacob Dale. “Development of an integrated building load and ground source heat pump model to assess heat pump and ground loop design and performance in a commercial office building.” 2014. Masters Thesis, University of Texas – Austin. Accessed December 14, 2019.
http://hdl.handle.net/2152/26320.
MLA Handbook (7th Edition):
Blair, Jacob Dale. “Development of an integrated building load and ground source heat pump model to assess heat pump and ground loop design and performance in a commercial office building.” 2014. Web. 14 Dec 2019.
Vancouver:
Blair JD. Development of an integrated building load and ground source heat pump model to assess heat pump and ground loop design and performance in a commercial office building. [Internet] [Masters thesis]. University of Texas – Austin; 2014. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/2152/26320.
Council of Science Editors:
Blair JD. Development of an integrated building load and ground source heat pump model to assess heat pump and ground loop design and performance in a commercial office building. [Masters Thesis]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/26320
Ryerson University
14.
Safa, Amir Alizadeh.
Performance analysis of a two-stage variable capacity air source heat pump and a horizontal loop coupled ground source heat pump system.
Degree: 2012, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A1281
► The thermal performance of a new two-stage variable capacity air source heat pump (ASHP) and a horizontal ground loop ground source heat pump (GSHP) was…
(more)
▼ The thermal performance of a new two-stage variable capacity air
source heat pump (ASHP) and a horizontal
ground loop
ground source heat pump (
GSHP) was investigated side-by-side at the Archetype Sustainable Twin Houses located in Toronto, Canada. The
heat pumps were tested in cooling mode, as well as heating mode under extreme winter conditions. In cooling mode, the ASHP COP ranged from 4.7 to 5.7 at an outdoor temperature of 33 degrees C and 16 degrees C respectively, while the
GSHP COP ranged from 4.9 (at an ELT of 8.5 degrees C and EST of 19.2 degrees C) to 5.6 (at an ELT of 12. 4 degrees C and EST of 17.8 degrees C). In heating mode, the ASHP COP ranged from 1.79 to 5.0 at an outdoor temperature of -19 degrees C and 9 degrees C respectively, while the
GSHP COP ranged from 3.05 (at an ELT of 44.4 degrees C and an EST of 2.7 degrees C) to 3.44 (at an ELT of 41.5 degrees C and an EST of 5.48 degrees C) during the earlier winter test period. Data extrapolation and energy simulation was also performed to predict annual
heat pump performance in Toronto as well as other Canadian regions.
Advisors/Committee Members: Fung, Alan (Thesis advisor).
Subjects/Keywords: Heat pumps; Ground source heat pump systems; Dwellings – Heating and ventilation
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APA (6th Edition):
Safa, A. A. (2012). Performance analysis of a two-stage variable capacity air source heat pump and a horizontal loop coupled ground source heat pump system. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A1281
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Safa, Amir Alizadeh. “Performance analysis of a two-stage variable capacity air source heat pump and a horizontal loop coupled ground source heat pump system.” 2012. Thesis, Ryerson University. Accessed December 14, 2019.
https://digital.library.ryerson.ca/islandora/object/RULA%3A1281.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Safa, Amir Alizadeh. “Performance analysis of a two-stage variable capacity air source heat pump and a horizontal loop coupled ground source heat pump system.” 2012. Web. 14 Dec 2019.
Vancouver:
Safa AA. Performance analysis of a two-stage variable capacity air source heat pump and a horizontal loop coupled ground source heat pump system. [Internet] [Thesis]. Ryerson University; 2012. [cited 2019 Dec 14].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1281.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Safa AA. Performance analysis of a two-stage variable capacity air source heat pump and a horizontal loop coupled ground source heat pump system. [Thesis]. Ryerson University; 2012. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1281
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
15.
Kamarad, Anthony.
Design and construction of a mobile equipment for thermal response test in borehole heat exchangers.
Degree: Applied Thermodynamics and Refrigeration, 2012, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99558
► In 2010, the Ground Source Heat Pumps (GSHPs) market in the European Union went up over one million (1 014 436 units at the end of…
(more)
▼ In 2010, the Ground Source Heat Pumps (GSHPs) market in the European Union went up over one million (1 014 436 units at the end of 2010 according to EUROBSERV’ER 2011). In 2011, it was estimated around 1.25 million according to Bayer et al. (2012). With more than 378 000 units installed in 2010, according to the Swedish heat pump association (SVEP), the Swedish GSHPs market was the first in the EU. As for the French GSHPs market, it was estimated to 151 938 units in service in 2010, which propelled France at the third rank in the EU. However, despite a relatively important number of GSHPs installed in the whole EU, since 2008 GSHP sales have shrank. Even Sweden which has been the most competitive country sees its GSHP sales decline in the first quarter of 2012 (EUROBSERV’ER 2011). This report is the achievement of my Master of Science Thesis project. It also represents the end of my studies at INSA Lyon in France and concludes my degree in Energetic and Environment Engineering. This report deals with the improvement of a heat injection apparatus which is available at KTH (Royal Institute of Technology). This equipment is better known as Thermal Response Test (TRT) apparatus. This kind of equipment improves Borehole Heat Exchangers (BHE) design in terms of size and cost benefits. This technology is generally used to design GSHP installations in both domestic and industrial purposes. It allows to determine really important thermal BHE parameters: the thermal conductivity of the ground and the borehole thermal resistance. The report covers a theoretical description of TRT experiments, the reasons and objectives of such a project, the apparatus design and its construction. The last part is dedicated to a first experimental laboratory results and some problems met during the project course.
Subjects/Keywords: Thermal Response Test; Borehole Heat Exchanger; Ground Source Heat Pump
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APA (6th Edition):
Kamarad, A. (2012). Design and construction of a mobile equipment for thermal response test in borehole heat exchangers. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99558
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kamarad, Anthony. “Design and construction of a mobile equipment for thermal response test in borehole heat exchangers.” 2012. Thesis, KTH. Accessed December 14, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99558.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kamarad, Anthony. “Design and construction of a mobile equipment for thermal response test in borehole heat exchangers.” 2012. Web. 14 Dec 2019.
Vancouver:
Kamarad A. Design and construction of a mobile equipment for thermal response test in borehole heat exchangers. [Internet] [Thesis]. KTH; 2012. [cited 2019 Dec 14].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99558.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kamarad A. Design and construction of a mobile equipment for thermal response test in borehole heat exchangers. [Thesis]. KTH; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99558
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manitoba
16.
Olfman, Maeir Zalman.
Characterization of the Ground Thermal Response to Heating by a Deep Vertical Borehole Heat Exchanger.
Degree: Mechanical and Manufacturing Engineering, 2012, University of Manitoba
URL: http://hdl.handle.net/1993/5086
► This thesis presents an experiment and an analysis that evaluates some of the long-standing assumptions in deep vertical borehole ground heat exchanger (GHX) theory. These…
(more)
▼ This thesis presents an experiment and an analysis that evaluates some of the long-standing assumptions in deep vertical borehole
ground heat exchanger (GHX) theory. These assumptions neglect
ground heterogeneity and depth variations in GHX output and the
ground temperature response (GTR). This thesis describes an apparatus and an experiment that measured the GTR at several depths, times, and at two different horizontal distances from a GHX both during and immediately after its operation. This thesis also reports the temperature response data, which may not be available from other sources in such detail. The experiment showed that the GTR can be highly depth dependant. The analysis involved a parametric study to characterize the GTR by developing an effective computer simulation of the experiment. The analysis showed that
ground heterogeneity significantly affected the GTR and the GHX output in this study. Furthermore, this GHX output showed depth and time, dependence.
Advisors/Committee Members: Woodbury, Allan (Civil Engineering) Bartley, Jonathan (Mechanical and Manufacturing Engineering) (supervisor), Kuhn, David (Mechanical and Manufacturing Engineering) Sri Ranjan, Ramanathan (Biosystems Engineering) (examiningcommittee).
Subjects/Keywords: Geothermal; Ground-Source; Heat Pump; Heat Transfer; Environment; Engineering
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APA (6th Edition):
Olfman, M. Z. (2012). Characterization of the Ground Thermal Response to Heating by a Deep Vertical Borehole Heat Exchanger. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/5086
Chicago Manual of Style (16th Edition):
Olfman, Maeir Zalman. “Characterization of the Ground Thermal Response to Heating by a Deep Vertical Borehole Heat Exchanger.” 2012. Masters Thesis, University of Manitoba. Accessed December 14, 2019.
http://hdl.handle.net/1993/5086.
MLA Handbook (7th Edition):
Olfman, Maeir Zalman. “Characterization of the Ground Thermal Response to Heating by a Deep Vertical Borehole Heat Exchanger.” 2012. Web. 14 Dec 2019.
Vancouver:
Olfman MZ. Characterization of the Ground Thermal Response to Heating by a Deep Vertical Borehole Heat Exchanger. [Internet] [Masters thesis]. University of Manitoba; 2012. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/1993/5086.
Council of Science Editors:
Olfman MZ. Characterization of the Ground Thermal Response to Heating by a Deep Vertical Borehole Heat Exchanger. [Masters Thesis]. University of Manitoba; 2012. Available from: http://hdl.handle.net/1993/5086
Ryerson University
17.
Ghahfarrokhy, Seyed Masih Alavy.
Optimization of Hybrid Ground Source Heat Pump System Design.
Degree: 2013, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A2052
► The lack of a computerized approach to optimally size hybrid Ground Source Heat Pump (GSHP) systems leaves a glaring gap in our knowledge of their…
(more)
▼ The lack of a computerized approach to optimally size hybrid Ground Source Heat Pump (GSHP) systems leaves a glaring gap in our knowledge of their benefits when utilized in an urban environment. To address this issue, this study introduces two new, robust methodologies, one for determining optimal GSHP size as part of a hybrid system for an individual building and one for assessing the appropriateness of combining multiple buildings onto a single hybrid GSHP system. Both methodologies simultaneously consider heating and cooling and are applicable to residential, commercial and industrial buildings that are either heating or cooling dominant. Using these methodologies can result in significant reductions in initial costs of installation, payback period, and operation costs, when compared to following rules of thumb or using non-hybrid systems. In most cases, when optimization is performed, the GSHP meets very large portions of the total annual heating and cooling demand of buildings.
Subjects/Keywords: Ground source heat pump systems – Construction and design; Hybrid power systems – Construction and design; Ground source heat pump systems – Simulation methods
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APA ·
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APA (6th Edition):
Ghahfarrokhy, S. M. A. (2013). Optimization of Hybrid Ground Source Heat Pump System Design. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A2052
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ghahfarrokhy, Seyed Masih Alavy. “Optimization of Hybrid Ground Source Heat Pump System Design.” 2013. Thesis, Ryerson University. Accessed December 14, 2019.
https://digital.library.ryerson.ca/islandora/object/RULA%3A2052.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ghahfarrokhy, Seyed Masih Alavy. “Optimization of Hybrid Ground Source Heat Pump System Design.” 2013. Web. 14 Dec 2019.
Vancouver:
Ghahfarrokhy SMA. Optimization of Hybrid Ground Source Heat Pump System Design. [Internet] [Thesis]. Ryerson University; 2013. [cited 2019 Dec 14].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2052.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ghahfarrokhy SMA. Optimization of Hybrid Ground Source Heat Pump System Design. [Thesis]. Ryerson University; 2013. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2052
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
18.
Schön, Gustav.
NUMERICAL MODELLING OF A NOVEL PVT COLLECTOR AT CELL RESOLUTION.
Degree: Energy Technology, 2017, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212731
► Solar photovoltaic-thermal (PVT) modules produce heat and power via a heat exchanger attached to the rear of the PV cells. The novel PVT collector…
(more)
▼ Solar photovoltaic-thermal (PVT) modules produce heat and power via a heat exchanger attached to the rear of the PV cells. The novel PVT collector in this study is previously untested and therefore its behaviour and thermo-electric performance due to fluid channel configuration and in various climate and operating conditions are unknown. Moreover, the working fluid flowing through the heat exchanger cause a temperature gradient across the module such that a cell near the inlet and a cell near the outlet may have significant temperature differences. PV cells are sensitive to temperature; however the most common way to simulate power output from a PVT is to use the average temperature and ignore the gradient. In this study, a single diode PV model is incorporated into a commercial thermal solver to co-simulate the thermal and electrical output of a novel PVT module design with cell level resolution. The PVT system is modelled in steady state under various wind speeds, inlet temperatures, ambient temperatures, flow rates, irradiation, convection coefficients from coolant and back of the module and two different fluid channel configurations. The results show that of the controllable variables, the inlet temperature has the highest influence of the total power output and that a parallel flow of the fluid channel configuration is preferable. The difference between the cell resolution and the module resolution simulations do not motivate the use of a higher resolution numerical simulation.
En kombinerad solcellspanel och solvärmefångare (PVT) producerar värme och elenergi på samma yta genom att en värmeväxlare upptar värmen från baksidan av solcellspanelen. Den PVT som berörs i denna studien är nyutvecklad och har aldrig tidigare testats, vilket medför att data för hur den beter sig samt dess termo-elektiska prestanda saknas för olika driftförhållanden samt flödeskonfigurationer. Vidare ger mediet som flödar genom värmeväxlaren upphov till en temperaturgradient, vilken kan innebära en påtaglig skillnad i temperatur mellan solcellerna i solcellspanelen vid mediets in- respektive utlopp. Trots solcellers temperaturkänslighet, så sker simulering i allmänhet med avseende på panelens medeltemperatur istället för att hänsyn tas till denna temperaturgradient. I den här studien implementeras en så kallad ”single diode”-modell i en kommersiell numerisk mjukvara termiska beräkningar för att samsimulera termiskt och elektriskt effektuttag ur den nyutvecklade PVT-designen. Designen modelleras statiskt under givna variationer av vindhastighet, inloppstemperatur, omgivande temperatur, flödeshastighet, solinstrålning och konvektionskoefficienter för mediet samt baksidan av modulen. Resultaten visar att kontrollerbara variabler som inloppstemperatur har högst inverkan på den totala effekten samt att en parallell flödeskonfiguration lämpar sig bäst. Studien visar också att skillnaden mellan simulering på cellnivå och modulnivå inte motiverar en numerisk beräkningsmetod med upplösning satt till solcellsnivå.
Subjects/Keywords: Photovoltaic; Thermal; Solar; Hybrid system; Ground Source Heat Pump; Energy; Renewable; Collector; Absorber; TAITherm; PVT; PV/Thermal; Mechanical Engineering; Maskinteknik
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APA ·
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APA (6th Edition):
Schön, G. (2017). NUMERICAL MODELLING OF A NOVEL PVT COLLECTOR AT CELL RESOLUTION. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212731
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Schön, Gustav. “NUMERICAL MODELLING OF A NOVEL PVT COLLECTOR AT CELL RESOLUTION.” 2017. Thesis, KTH. Accessed December 14, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212731.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Schön, Gustav. “NUMERICAL MODELLING OF A NOVEL PVT COLLECTOR AT CELL RESOLUTION.” 2017. Web. 14 Dec 2019.
Vancouver:
Schön G. NUMERICAL MODELLING OF A NOVEL PVT COLLECTOR AT CELL RESOLUTION. [Internet] [Thesis]. KTH; 2017. [cited 2019 Dec 14].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212731.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Schön G. NUMERICAL MODELLING OF A NOVEL PVT COLLECTOR AT CELL RESOLUTION. [Thesis]. KTH; 2017. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212731
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Colorado
19.
Kwag, Byung Chang.
Thermal Performance and Design Guidelines of Thermo-Active Foundations.
Degree: PhD, 2015, University of Colorado
URL: https://scholar.colorado.edu/cven_gradetds/144
► A thermo-active foundation system can be a cost-effective technology to utilize ground thermal energy to heat and cool buildings. Indeed, thermo-active foundations, also known…
(more)
▼ A thermo-active foundation
system can be a cost-effective technology to utilize
ground thermal energy to
heat and cool buildings. Indeed, thermo-active foundations, also known as thermal piles, integrate
heat exchangers with the foundation elements and thus eliminate the need of drilling deep boreholes typically required by the conventional
ground source heat pumps. In order to properly design thermo-active foundation systems, their thermal performance under various operating and climatic conditions are evaluated as part of this study using detailed modeling and simulation analyses. In particular, a transient three-dimensional finite difference numerical model has been developed and validated to analyze thermal performances of thermo-active foundations. The numerical model is then used to assess the impact of design parameters such as foundation depth, shank space, fluid flow rate, and the number of loops on the effectiveness of thermal piles to exchange
heat between the building and the
ground. Moreover, thermal response factors have been developed to integrate the performance of thermo-active foundations within detailed whole-building simulation programs. In this study, response factors specific to thermo-active foundations are implemented into EnergyPlus to investigate the impact of design and operating conditions. The results from the detailed simulation analysis are then used to develop a set of guidelines to properly design thermo-active foundation to meet heating and cooling loads of commercial buildings. This paper develops the design guide chart for TAF systems. The design guide chart provides the determination of required
heat exchanger pipe length per water-to-water
heat pump capacity for certain annual average
ground temperature and for certain targeted maximum entering water temperature to a
heat pump. Using an example application, this paper presents the usage of the design guide chart as well as shows the potential of the design guide chart for designing TAF
system.
Advisors/Committee Members: Moncef Krarti, Michael J. Brandemuehl, John Z. Zhai, Wil V. Srubar, Junghyon Mun.
Subjects/Keywords: design guideline; energy foundation; ground source heat pump system; thermal response factors; thermo-active foundation; Architectural Engineering
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Kwag, B. C. (2015). Thermal Performance and Design Guidelines of Thermo-Active Foundations. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/144
Chicago Manual of Style (16th Edition):
Kwag, Byung Chang. “Thermal Performance and Design Guidelines of Thermo-Active Foundations.” 2015. Doctoral Dissertation, University of Colorado. Accessed December 14, 2019.
https://scholar.colorado.edu/cven_gradetds/144.
MLA Handbook (7th Edition):
Kwag, Byung Chang. “Thermal Performance and Design Guidelines of Thermo-Active Foundations.” 2015. Web. 14 Dec 2019.
Vancouver:
Kwag BC. Thermal Performance and Design Guidelines of Thermo-Active Foundations. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2019 Dec 14].
Available from: https://scholar.colorado.edu/cven_gradetds/144.
Council of Science Editors:
Kwag BC. Thermal Performance and Design Guidelines of Thermo-Active Foundations. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/cven_gradetds/144
University of Utah
20.
Nakaoka, Joshua.
Heat transfer analysis of thermosiphons and U-tube ground source heat pumps.
Degree: MS, Mechanical Engineering, 2012, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2024/rec/1212
► Ground source thermal energy transport systems have the potential to improve theefficiency of space heating.Two such systems, a thermosiphon and a vertical U-tube system, were…
(more)
▼ Ground source thermal energy transport systems have the potential to improve theefficiency of space heating.Two such systems, a thermosiphon and a vertical U-tube system, were installed in ahousing unit in Park City, Utah with the aim of assessing performance. From temperaturemeasurements, the heating Coefficient of Performance (COP) for the U-tube system wasdetermined to be around 3. When taking into consideration only space heating, becauseof the poor performance of the U-tube system and the relatively inexpensive cost ofnatural gas, the high installation cost of this particular U-tube GSHP will not be recoupedin energy cost savings. COP was not used to assess the thermosiphon, but the heattransfer rate per unit length associated with the thermosiphon was found to beapproximately 2.3 times greater than that of the U-tube system.Transient temperature measurements led to the development of a conceptual heattransfer model that described the convective heat transfer between flowing groundwaterand the thermal grout sealing each piping network. Using this model, a method wasdeveloped to infer the convective heat transfer coefficient of each system directly fromtemperature measurements along the outside of each piping network without directlymeasuring groundwater velocity. From this method, the heat transfer coefficient for theU-tube was accurately found to be between 8 and 14.4 W/m2-K.
Subjects/Keywords: Geothermal; Ground Source Heat Pump; Thermosiphon; U-Tube GSHPs
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❌
APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nakaoka, J. (2012). Heat transfer analysis of thermosiphons and U-tube ground source heat pumps. (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2024/rec/1212
Chicago Manual of Style (16th Edition):
Nakaoka, Joshua. “Heat transfer analysis of thermosiphons and U-tube ground source heat pumps.” 2012. Masters Thesis, University of Utah. Accessed December 14, 2019.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2024/rec/1212.
MLA Handbook (7th Edition):
Nakaoka, Joshua. “Heat transfer analysis of thermosiphons and U-tube ground source heat pumps.” 2012. Web. 14 Dec 2019.
Vancouver:
Nakaoka J. Heat transfer analysis of thermosiphons and U-tube ground source heat pumps. [Internet] [Masters thesis]. University of Utah; 2012. [cited 2019 Dec 14].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2024/rec/1212.
Council of Science Editors:
Nakaoka J. Heat transfer analysis of thermosiphons and U-tube ground source heat pumps. [Masters Thesis]. University of Utah; 2012. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/2024/rec/1212
University of Minnesota
21.
Li, Mo.
Life Cycle Assessment of Residential Heating and Cooling
Systems in Minnesota: A comprehensive analysis on life cycle
greenhouse gas (GHG) emissions and cost-costeffectiveness of ground
source heat pump (GSHP) systems compared to the conventional gas
furnace and air conditioner system.
Degree: MS, Bioproducts/Biosystems Science Engineering and Management, 2013, University of Minnesota
URL: http://purl.umn.edu/146449
► University of Minnesota M.S. thesis. January 2013. Major: Bioproducts/Biosystems Science Engineering and Management. Advisor: Timothy M. Smith. 1 computer file (PDF); viii, 77 pages, appendices…
(more)
▼ University of Minnesota M.S. thesis. January 2013.
Major: Bioproducts/Biosystems Science Engineering and Management.
Advisor: Timothy M. Smith. 1 computer file (PDF); viii, 77 pages,
appendices p. 60-77.
Ground Source Heat Pump (GSHP) technologies for
residential heating and cooling are often suggested as an effective
means to curb energy consumption, reduce greenhouse gas (GHG)
emissions and lower homeowners' heating and cooling costs. As such,
numerous federal, state and utility-based incentives, most often in
the forms of financial incentives, installation rebates, and loan
programs, have been made available for these technologies. While
GSHP technology for space heating and cooling is well understood,
with widespread implementation across the U.S., research specific
to the environmental and economic performance of these systems in
cold climates, such as Minnesota, is limited. In this study, a
comparative environmental life cycle assessment (LCA) is conducted
of typical residential HVAC (Heating, Ventilation, and Air
Conditioning) systems in Minnesota to investigate greenhouse gas
(GHG) emissions for delivering 20 years of residential heating and
cooling - maintaining indoor temperatures of 68ºF (20ºC) and 75ºF
(24ºC) in Minnesota-specific heating and cooling seasons,
respectively. Eight residential GSHP design scenarios (i.e.
horizontal loop field, vertical loop field, high coefficient of
performance, low coefficient of performance, hybrid natural gas
heat back-up) and one conventional natural gas furnace and air
conditioner system are assessed for GHG and life cycle economic
costs. Life cycle GHG emissions were found to range between 1.09 ×
105 kg CO2 eq. and 1.86 × 105 kg CO2 eq. Six of the eight GSHP
technology scenarios had fewer carbon impacts than the conventional
system. Only in cases of horizontal low-efficiency GSHP and hybrid,
do results suggest increased GHGs. Life cycle costs and present
value analyses suggest GSHP technologies can be cost competitive
over their 20-year life, but that policy incentives may be required
to reduce the high up-front capital costs of GSHPs and relatively
long payback periods of more than 20 years. In addition, results
suggest that the regional electricity fuel mix and volatile energy
prices significantly influence the benefits of employing GSHP
technologies in Minnesota from both environmental and economic
perspectives. It is worthy noting that with the historically low
natural gas price in 2012, the conventional system's energy bill
reduction would be large enough to bring its life-cycle cost below
those of the GSHPs. As a result, the environmentally favorable GSHP
technologies would become economically unfavorable, unless they are
additionally subsidized. Improved understanding these effects,
along with design and performance characteristics of GSGP
technologies specific to Minnesota's cold climate, allows better
decision making among homeowners considering these technologies and
policy makers providing incentives for alternative energy
solutions.
Advisors/Committee Members: Timothy M. Smith.
Subjects/Keywords: Economic; Environmental; Ground source heat pump; Life cycle assessment
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, M. (2013). Life Cycle Assessment of Residential Heating and Cooling
Systems in Minnesota: A comprehensive analysis on life cycle
greenhouse gas (GHG) emissions and cost-costeffectiveness of ground
source heat pump (GSHP) systems compared to the conventional gas
furnace and air conditioner system. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/146449
Chicago Manual of Style (16th Edition):
Li, Mo. “Life Cycle Assessment of Residential Heating and Cooling
Systems in Minnesota: A comprehensive analysis on life cycle
greenhouse gas (GHG) emissions and cost-costeffectiveness of ground
source heat pump (GSHP) systems compared to the conventional gas
furnace and air conditioner system.” 2013. Masters Thesis, University of Minnesota. Accessed December 14, 2019.
http://purl.umn.edu/146449.
MLA Handbook (7th Edition):
Li, Mo. “Life Cycle Assessment of Residential Heating and Cooling
Systems in Minnesota: A comprehensive analysis on life cycle
greenhouse gas (GHG) emissions and cost-costeffectiveness of ground
source heat pump (GSHP) systems compared to the conventional gas
furnace and air conditioner system.” 2013. Web. 14 Dec 2019.
Vancouver:
Li M. Life Cycle Assessment of Residential Heating and Cooling
Systems in Minnesota: A comprehensive analysis on life cycle
greenhouse gas (GHG) emissions and cost-costeffectiveness of ground
source heat pump (GSHP) systems compared to the conventional gas
furnace and air conditioner system. [Internet] [Masters thesis]. University of Minnesota; 2013. [cited 2019 Dec 14].
Available from: http://purl.umn.edu/146449.
Council of Science Editors:
Li M. Life Cycle Assessment of Residential Heating and Cooling
Systems in Minnesota: A comprehensive analysis on life cycle
greenhouse gas (GHG) emissions and cost-costeffectiveness of ground
source heat pump (GSHP) systems compared to the conventional gas
furnace and air conditioner system. [Masters Thesis]. University of Minnesota; 2013. Available from: http://purl.umn.edu/146449
University of Minnesota
22.
Li, Mo.
Life Cycle Assessment of Residential Heating and Cooling Systems in Minnesota: A comprehensive analysis on life cycle greenhouse gas (GHG) emissions and cost-costeffectiveness of ground source heat pump (GSHP) systems compared to the conventional gas furnace and air conditioner system.
Degree: MS, Bioproducts/Biosystems Science Engineering and Management, 2013, University of Minnesota
URL: http://purl.umn.edu/146449
► Ground Source Heat Pump (GSHP) technologies for residential heating and cooling are often suggested as an effective means to curb energy consumption, reduce greenhouse gas…
(more)
▼ Ground Source Heat Pump (GSHP) technologies for residential heating and cooling are often suggested as an effective means to curb energy consumption, reduce greenhouse gas (GHG) emissions and lower homeowners' heating and cooling costs. As such, numerous federal, state and utility-based incentives, most often in the forms of financial incentives, installation rebates, and loan programs, have been made available for these technologies. While GSHP technology for space heating and cooling is well understood, with widespread implementation across the U.S., research specific to the environmental and economic performance of these systems in cold climates, such as Minnesota, is limited. In this study, a comparative environmental life cycle assessment (LCA) is conducted of typical residential HVAC (Heating, Ventilation, and Air Conditioning) systems in Minnesota to investigate greenhouse gas (GHG) emissions for delivering 20 years of residential heating and cooling - maintaining indoor temperatures of 68ºF (20ºC) and 75ºF (24ºC) in Minnesota-specific heating and cooling seasons, respectively. Eight residential GSHP design scenarios (i.e. horizontal loop field, vertical loop field, high coefficient of performance, low coefficient of performance, hybrid natural gas heat back-up) and one conventional natural gas furnace and air conditioner system are assessed for GHG and life cycle economic costs. Life cycle GHG emissions were found to range between 1.09 × 105 kg CO2 eq. and 1.86 × 105 kg CO2 eq. Six of the eight GSHP technology scenarios had fewer carbon impacts than the conventional system. Only in cases of horizontal low-efficiency GSHP and hybrid, do results suggest increased GHGs. Life cycle costs and present value analyses suggest GSHP technologies can be cost competitive over their 20-year life, but that policy incentives may be required to reduce the high up-front capital costs of GSHPs and relatively long payback periods of more than 20 years. In addition, results suggest that the regional electricity fuel mix and volatile energy prices significantly influence the benefits of employing GSHP technologies in Minnesota from both environmental and economic perspectives. It is worthy noting that with the historically low natural gas price in 2012, the conventional system's energy bill reduction would be large enough to bring its life-cycle cost below those of the GSHPs. As a result, the environmentally favorable GSHP technologies would become economically unfavorable, unless they are additionally subsidized. Improved understanding these effects, along with design and performance characteristics of GSGP technologies specific to Minnesota's cold climate, allows better decision making among homeowners considering these technologies and policy makers providing incentives for alternative energy solutions.
Subjects/Keywords: Economic; Environmental; Ground source heat pump; Life cycle assessment
Record Details
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Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, M. (2013). Life Cycle Assessment of Residential Heating and Cooling Systems in Minnesota: A comprehensive analysis on life cycle greenhouse gas (GHG) emissions and cost-costeffectiveness of ground source heat pump (GSHP) systems compared to the conventional gas furnace and air conditioner system. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/146449
Chicago Manual of Style (16th Edition):
Li, Mo. “Life Cycle Assessment of Residential Heating and Cooling Systems in Minnesota: A comprehensive analysis on life cycle greenhouse gas (GHG) emissions and cost-costeffectiveness of ground source heat pump (GSHP) systems compared to the conventional gas furnace and air conditioner system.” 2013. Masters Thesis, University of Minnesota. Accessed December 14, 2019.
http://purl.umn.edu/146449.
MLA Handbook (7th Edition):
Li, Mo. “Life Cycle Assessment of Residential Heating and Cooling Systems in Minnesota: A comprehensive analysis on life cycle greenhouse gas (GHG) emissions and cost-costeffectiveness of ground source heat pump (GSHP) systems compared to the conventional gas furnace and air conditioner system.” 2013. Web. 14 Dec 2019.
Vancouver:
Li M. Life Cycle Assessment of Residential Heating and Cooling Systems in Minnesota: A comprehensive analysis on life cycle greenhouse gas (GHG) emissions and cost-costeffectiveness of ground source heat pump (GSHP) systems compared to the conventional gas furnace and air conditioner system. [Internet] [Masters thesis]. University of Minnesota; 2013. [cited 2019 Dec 14].
Available from: http://purl.umn.edu/146449.
Council of Science Editors:
Li M. Life Cycle Assessment of Residential Heating and Cooling Systems in Minnesota: A comprehensive analysis on life cycle greenhouse gas (GHG) emissions and cost-costeffectiveness of ground source heat pump (GSHP) systems compared to the conventional gas furnace and air conditioner system. [Masters Thesis]. University of Minnesota; 2013. Available from: http://purl.umn.edu/146449
KTH
23.
Beltran, Francisco.
Techno-Economic Analysis of Solar Photovoltaic and Heat Pump Systems for a North Macedonian Hospital.
Degree: Industrial Engineering and Management (ITM), 2019, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264241
► The International Energy Agency’s Global Status Report 2017 estimates that existing buildings must undergo deep energy renovations, which reduce the energy intensity of buildings…
(more)
▼ The International Energy Agency’s Global Status Report 2017 estimates that existing buildings must undergo deep energy renovations, which reduce the energy intensity of buildings by 50% - 70% in order to achieve the “Beyond 2°C” scenario [1]. Many buildings in Bitola, The Republic of North Macedonia, will need considerable upgrades to meet these goals. Among them, health care facilities and education centers have the greatest potential, with energy savings that could reach 35 to 40% [2]. PHI Clinical Hospital Bitola is the largest health care facility in the southwestern region of North Macedonia with a capacity of 500 beds, providing care to almost 300.000 patients annually. It has a heating system based on heavy fuel oil, and an inefficient distribution system which has not been upgraded since the 1970s. There is no centralized ventilation or cooling systems, making it necessary to open and close windows in order to regulate the indoor temperature and generate natural ventilation. This study aims to replace the use of heavy fuel oil (HFO), reduce building related GHG emissions, and increase the primary renewable energy fraction of PHI Clinical Hospital Bitola, by investigating a replacement energy system using heat pumps and solar energy. Special consideration is given to increasing the level of comfort of patients and improving the safety of the indoor environment. Space conditioning, domestic hot water, and electricity demands for three critical buildings are considered in Polysun over a 1-year period. The costs and benefits of technologies including air and ground source heat pumps, solar photovoltaics, and ice thermal energy storage are analyzed. It is determined which of these technologies can be implemented in an energy and cost-efficient manner in the Republic of North Macedonia, thus contributing to the reduction of building related greenhouse gas emissions and other pollutants that contribute to poor air quality. Ground source heat pumps perform superior to air source heat pumps, however, the total life cycle costs of ground source heat pump systems are much higher than air source heat pump systems, making the marginal gains in the technical performance not worth the investment in a borehole field. When using ice thermal energy storage within the cooling and domestic hot water systems the benefits of improved heat pump performance and reduced electricity consumption are not observed. The configuration of thermal storage tested here uses the domestic hot water system to withdraw heat from the thermal storage tank, creating ice, which is then used to decrease the need for cooling using the chiller. However, the cooling load is much larger than the hot water demand, and so any ice generated in the tank is depleted within the first few days of cooling. Many other configurations and control strategies for thermal storage exist which could be the subject of further research. When selecting a renewable energy system that could replace the current HFO boiler in the hospital, the…
Subjects/Keywords: ground source heat pump; air source heat pump; ice thermal energy storage.; Engineering and Technology; Teknik och teknologier
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APA (6th Edition):
Beltran, F. (2019). Techno-Economic Analysis of Solar Photovoltaic and Heat Pump Systems for a North Macedonian Hospital. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264241
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Beltran, Francisco. “Techno-Economic Analysis of Solar Photovoltaic and Heat Pump Systems for a North Macedonian Hospital.” 2019. Thesis, KTH. Accessed December 14, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264241.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Beltran, Francisco. “Techno-Economic Analysis of Solar Photovoltaic and Heat Pump Systems for a North Macedonian Hospital.” 2019. Web. 14 Dec 2019.
Vancouver:
Beltran F. Techno-Economic Analysis of Solar Photovoltaic and Heat Pump Systems for a North Macedonian Hospital. [Internet] [Thesis]. KTH; 2019. [cited 2019 Dec 14].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264241.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Beltran F. Techno-Economic Analysis of Solar Photovoltaic and Heat Pump Systems for a North Macedonian Hospital. [Thesis]. KTH; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264241
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Back, Natalii.
Bergvärme som energikälla.
Degree: Sustainable Development of Society and Technology, 2008, Mälardalen University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-712
► 2008-05-26 Bedrock heat as an energy source The sun has warmed up the bedrock and this heat can be used for warming up houses.…
(more)
▼ 2008-05-26 Bedrock heat as an energy source The sun has warmed up the bedrock and this heat can be used for warming up houses. Approximately 100 – 200 meters down in the bedrock the temperature of the heat is stable. This is a source of energy that can be used by installing a heat pump system. The ground source heat pumps are low maintenance and can last for many years. There is also a pollution risk for the groundwater and therefore the wells in the area. Before the ground source heat pump can be installed the municipality need to give permission, according to the environmental code. To install the system without permission is a crime against the environmental code. A requirement when applying for permission to install the heat pump system is to get the neighbours to agree with the place for the bore hole. The neighbour can appeal against the environmental and health authorities’ decision to give permission to install the ground source heat pump system. However there needs to be more research done regarding the environmental effects that may occur in the future, if the ground source heatpump system continues to increase as rapidly as today.
Subjects/Keywords: Ground source heat pump; ground water; well; environmental code; Environmental law; Miljörätt
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APA (6th Edition):
Back, N. (2008). Bergvärme som energikälla. (Thesis). Mälardalen University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-712
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Back, Natalii. “Bergvärme som energikälla.” 2008. Thesis, Mälardalen University. Accessed December 14, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-712.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Back, Natalii. “Bergvärme som energikälla.” 2008. Web. 14 Dec 2019.
Vancouver:
Back N. Bergvärme som energikälla. [Internet] [Thesis]. Mälardalen University; 2008. [cited 2019 Dec 14].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-712.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Back N. Bergvärme som energikälla. [Thesis]. Mälardalen University; 2008. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-712
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Ryerson University
25.
Rad, Farzin M.
Viability Of Hybrid Ground Source Heat Pump System With Solar Thermal Collectors.
Degree: 2009, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A1838
► This thesis presents a study for examining the viability of hybrid ground source heat pump (GSHP) systems that use solar thermal collectors as the supplemental…
(more)
▼ This thesis presents a study for examining the viability of hybrid ground source heat pump (GSHP) systems that use solar thermal collectors as the supplemental component in heating dominated buildings. Loads for an actual house in the City of Milton near Toronto were estimated. TRNSYS, a system simulation software tool, was used to model the yearly performance of conventional GSHP as well as the proposed hybrid GSHP system.The house was equipped with a data monitoring system which was installed to read and record fluid flow, temperature and electricity consumption in different components of the system. The actual yearly data collected from the site was examined against the simulation results. In addition, a sensitivity analysis was carried out to determine the relationship between the solar collector area and the ground loop heat exchanger (GHX) length. It was shown that the ratio of GHX length reduction to solar panel area of 4.7 m/m2 results in the optimum ratio, which corresponds to 32 m GHX length reduction with a 6.81m2 solar collector area.This study demonstrates that a hybrid GSHP system, combined with solar thermal collectors, is a feasible choice for space conditioning for heating dominated houses. It was shown that the solar thermal energy storage in the ground could reduce a large amount of ground loop heat exchanger length. Combining three solar thermal collectors with a total area of 6.81m2 to the GSHP system will reduce GHX length by %15 (from 222 m to 188 m). System malfunctioning in the cooling season was also detected, and options for fixing the problem were presented. A sensitivity analysis was carried out on different cities in Canada, and results demonstrated that Vancouver, with the mildest climate compared to other cities, was the best candidate for the proposed solar hybrid GSHP system with 7.64 m/m2GHX length reduction to solar collector area ratio. Overall system economical viability was also evaluated using a 20-year life-cycle cost analysis. The analysis showed that there is a economic benefit in comparing to GSHP. The net present value of the proposed hybrid system and GSHP system were estimated to be 44,834 and 41,406, respectively.
Subjects/Keywords: Ground source heat pump systems – Computer simulation; Solar collectors – Testing; Heat storage devices – Testing
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APA (6th Edition):
Rad, F. M. (2009). Viability Of Hybrid Ground Source Heat Pump System With Solar Thermal Collectors. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A1838
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rad, Farzin M. “Viability Of Hybrid Ground Source Heat Pump System With Solar Thermal Collectors.” 2009. Thesis, Ryerson University. Accessed December 14, 2019.
https://digital.library.ryerson.ca/islandora/object/RULA%3A1838.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rad, Farzin M. “Viability Of Hybrid Ground Source Heat Pump System With Solar Thermal Collectors.” 2009. Web. 14 Dec 2019.
Vancouver:
Rad FM. Viability Of Hybrid Ground Source Heat Pump System With Solar Thermal Collectors. [Internet] [Thesis]. Ryerson University; 2009. [cited 2019 Dec 14].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1838.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rad FM. Viability Of Hybrid Ground Source Heat Pump System With Solar Thermal Collectors. [Thesis]. Ryerson University; 2009. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1838
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
26.
Derouet, Marc.
Analysis of borehole heat exchanger in an existing ground-source heat pump installation.
Degree: Applied Thermodynamics and Refrigeration, 2014, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148158
► Ground-source heat pumps systems (GSHP) are commonly used all over Sweden to supply heat and sometimes cool to different kinds of housings or commercial…
(more)
▼ Ground-source heat pumps systems (GSHP) are commonly used all over Sweden to supply heat and sometimes cool to different kinds of housings or commercial facilities. Many large installations are by now between 10 and 20 years old. Even when the design of such system has been tackled, rare are the studies that have dealt with following their performance throughout time in detail. Based on conductive heat transfer, the heat extraction process makes the ground temperature decrease when installations are only used for heating. This thesis aims at proposing a method to evaluate how the temperature in a borehole heat exchanger of a GSHP will evolve. The project is focusing on the heat transfer from the ground to the boreholes modelled using Finite Line Source (FLS) based generated g-functions. “g-functions” are non-dimensional parameters characterizing the evolution of the ground thermal resistance enduring variable heat extraction loads. A model using Matlab has been developed and validated against relevant publications. As a case study, the method is applied to an existing 15 years old GSHP installation, composed of 26 boreholes and 3 heat pumps, so as to compare the obtained results with data measured on site. Two sub-borehole fields compose this installation: 14 of them were drilled in 1998 and the remaining 12 in 2009. Measured variable heat extraction loads were superposed using dedicated site g-functions for the two boreholes fields. As a result, a comparison between modelled and calculated heat carrier fluid in the boreholes over the last 6 months is presented here, as well as a 20 years forecast of the ground temperature at the interface with the boreholes.
Subjects/Keywords: ground source heat pump; borehole heat exchanger; g-function; analytical solution; temperature prediction
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APA (6th Edition):
Derouet, M. (2014). Analysis of borehole heat exchanger in an existing ground-source heat pump installation. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148158
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Derouet, Marc. “Analysis of borehole heat exchanger in an existing ground-source heat pump installation.” 2014. Thesis, KTH. Accessed December 14, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148158.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Derouet, Marc. “Analysis of borehole heat exchanger in an existing ground-source heat pump installation.” 2014. Web. 14 Dec 2019.
Vancouver:
Derouet M. Analysis of borehole heat exchanger in an existing ground-source heat pump installation. [Internet] [Thesis]. KTH; 2014. [cited 2019 Dec 14].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148158.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Derouet M. Analysis of borehole heat exchanger in an existing ground-source heat pump installation. [Thesis]. KTH; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148158
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universitat Politècnica de València
27.
Cazorla Marín, Antonio.
MODELLING AND EXPERIMENTAL VALIDATION OF AN INNOVATIVE COAXIAL HELICAL BOREHOLE HEAT EXCHANGER FOR A DUAL SOURCE HEAT PUMP SYSTEM
.
Degree: 2019, Universitat Politècnica de València
URL: http://hdl.handle.net/10251/125696
► [ES] La energía geotérmica de baja entalpía es una alternativa eficiente y renovable a los sistemas convencionales para proporcionar calefacción, refrigeración y producir agua caliente…
(more)
▼ [ES] La energía geotérmica de baja entalpía es una alternativa eficiente y renovable a los sistemas convencionales para proporcionar calefacción, refrigeración y producir agua caliente sanitaria (ACS) de forma sostenible.
El proyecto GEOTeCH plantea el desarrollo de sistemas con bomba de calor geotérmica más eficientes y con un coste menor en comparación con el mercado. Para ello, se ha desarrollado un nuevo tipo de intercambiador enterrado coaxial con flujo helicoidal en el tubo externo que presenta una mayor eficiencia y permite reducir la longitud de intercambiador a instalar, así como una bomba de calor dual con compresor de velocidad variable, capaz de trabajar con el terreno o el aire como fuente/sumidero, seleccionando la que proporcione un mejor rendimiento del sistema. El principal objetivo es desarrollar un sistema eficiente y replicable para proporcionar calefacción, refrigeración y producir ACS en el sector de mercado de pequeños edificios con un tamaño menor en el campo de intercambiadores enterrados y un aumento de la eficiencia. Para demostrar la aplicabilidad de estos sistemas, se han construido tres instalaciones demostración en tres países europeos.
En esta tesis doctoral se ha desarrollado un modelo dinámico completo del sistema en el software TRNSYS, capaz de reproducir el comportamiento de los diferentes componentes y del sistema en general. Este modelo constituye una herramienta útil para el desarrollo y análisis de diferentes estrategias de control sin la necesidad de implementarlas en instalaciones reales, así como analizar el comportamiento del sistema funcionando bajo condiciones diferentes. Para este propósito, es necesario desarrollar modelos detallados de los nuevos componentes desarrollados en el proyecto: el intercambiador enterrado coaxial helicoidal y la bomba de calor dual; para poder acoplarlos al resto de componentes en el modelo completo del sistema.
Por ello, se ha desarrollado un modelo dinámico del nuevo intercambiador, capaz de reproducir con precisión el comportamiento a corto plazo del intercambiador, enfocado a la evolución de la temperatura del fluido, y se ha validado con datos experimentales en diferentes condiciones de operación. Para poder reproducir no solo el comportamiento dinámico del intercambiador enterrado, sino también la respuesta a largo plazo del terreno y la interacción entre intercambiadores en un campo, se ha desarrollado otro modelo en TRNSYS que realiza esta función. De esta manera, al acoplar ambos modelos es posible reproducir el comportamiento a corto plazo del intercambiador enterrado a la vez que la respuesta a largo plazo del terreno.
Por otro lado, se ha implementado en TRNSYS un modelo de la bomba de calor dual desarrollado. Con este modelo es posible calcular la capacidad de la bomba de calor dependiendo del modo de operación en que esté funcionando, de la frecuencia del compresor y otras variables y condiciones de operación.
El modelo del sistema dual en TRNSYS se ha utilizado para hacer un análisis de su comportamiento funcionando en…
Advisors/Committee Members: Corberán Salvador, José Miguel (advisor), Montagud Montalvá, Carla Isabel (advisor).
Subjects/Keywords: Ground Source Heat Pump;
Borehole Heat Exchanger;
Dynamic modelling;
B2G model;
Coaxial helical borehole heat exchanger;
Dual Source Heat Pump;
Heating and cooling
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APA ·
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Export
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APA (6th Edition):
Cazorla Marín, A. (2019). MODELLING AND EXPERIMENTAL VALIDATION OF AN INNOVATIVE COAXIAL HELICAL BOREHOLE HEAT EXCHANGER FOR A DUAL SOURCE HEAT PUMP SYSTEM
. (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/125696
Chicago Manual of Style (16th Edition):
Cazorla Marín, Antonio. “MODELLING AND EXPERIMENTAL VALIDATION OF AN INNOVATIVE COAXIAL HELICAL BOREHOLE HEAT EXCHANGER FOR A DUAL SOURCE HEAT PUMP SYSTEM
.” 2019. Doctoral Dissertation, Universitat Politècnica de València. Accessed December 14, 2019.
http://hdl.handle.net/10251/125696.
MLA Handbook (7th Edition):
Cazorla Marín, Antonio. “MODELLING AND EXPERIMENTAL VALIDATION OF AN INNOVATIVE COAXIAL HELICAL BOREHOLE HEAT EXCHANGER FOR A DUAL SOURCE HEAT PUMP SYSTEM
.” 2019. Web. 14 Dec 2019.
Vancouver:
Cazorla Marín A. MODELLING AND EXPERIMENTAL VALIDATION OF AN INNOVATIVE COAXIAL HELICAL BOREHOLE HEAT EXCHANGER FOR A DUAL SOURCE HEAT PUMP SYSTEM
. [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2019. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10251/125696.
Council of Science Editors:
Cazorla Marín A. MODELLING AND EXPERIMENTAL VALIDATION OF AN INNOVATIVE COAXIAL HELICAL BOREHOLE HEAT EXCHANGER FOR A DUAL SOURCE HEAT PUMP SYSTEM
. [Doctoral Dissertation]. Universitat Politècnica de València; 2019. Available from: http://hdl.handle.net/10251/125696
Virginia Tech
28.
McDaniel, Matthew Lee.
Proposed Design for a Coupled Ground-Source Heat Pump/Energy Recovery Ventilator System to Reduce Building Energy Demand.
Degree: MS, Mechanical Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/33610
► The work presented in this thesis focuses on reducing the energy demand of a residential building by using a coupled ground-source heat pump/energy recovery ventilation…
(more)
▼ The work presented in this thesis focuses on reducing the energy demand of a residential building by using a coupled
ground-
source heat pump/energy recovery ventilation (
GSHP-ERV)
system to present a novel approach to space condition and domestic hot water supply for a residence. The proposed
system is capable of providing hot water on-demand with a high coefficient of performance (COP), thus eliminating the need for a hot water storage tank and circulation
system while requiring little power consumption. The necessary size of the proposed
system and the maximum and normal heating and cooling loads for the home were calculated based on the assumptions of an energy efficient home, the assumed construction specifications, and the climate characteristics of the Blacksburg, Virginia region. The results from the load analysis were used to predict energy consumption and costs associated with annual operations.The results for the predicted heating annual energy consumption and costs for the
GSHP-ERV
system were compared to an air-
source heat pump and a natural gas furnace. On average, it was determined that the proposed
system was capable of reducing annual energy consumption by 56-78% over air-
source heat pumps and 85-88% over a natural gas furnace. The proposed
GSHP-ERV
system reduced costs by 45-61% over air-
source heat pump systems and 52-58% over natural gas furnaces. The annual energy consumption and costs associated with cooling were not calculated as cooling accounts for a negligible portion (6%) of the total annual energy demand for a home in Blacksburg.
Advisors/Committee Members: Battaglia, Francine (committeechair), Nain, Amrinder (committee member), Huxtable, Scott T. (committee member).
Subjects/Keywords: energy efficiency; energy recovery ventilator; Ground-source heat pump; building energy demand
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APA (6th Edition):
McDaniel, M. L. (2011). Proposed Design for a Coupled Ground-Source Heat Pump/Energy Recovery Ventilator System to Reduce Building Energy Demand. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33610
Chicago Manual of Style (16th Edition):
McDaniel, Matthew Lee. “Proposed Design for a Coupled Ground-Source Heat Pump/Energy Recovery Ventilator System to Reduce Building Energy Demand.” 2011. Masters Thesis, Virginia Tech. Accessed December 14, 2019.
http://hdl.handle.net/10919/33610.
MLA Handbook (7th Edition):
McDaniel, Matthew Lee. “Proposed Design for a Coupled Ground-Source Heat Pump/Energy Recovery Ventilator System to Reduce Building Energy Demand.” 2011. Web. 14 Dec 2019.
Vancouver:
McDaniel ML. Proposed Design for a Coupled Ground-Source Heat Pump/Energy Recovery Ventilator System to Reduce Building Energy Demand. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/10919/33610.
Council of Science Editors:
McDaniel ML. Proposed Design for a Coupled Ground-Source Heat Pump/Energy Recovery Ventilator System to Reduce Building Energy Demand. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/33610
Cornell University
29.
Beckers, Koenraad.
Low-Temperature Geothermal Energy: Systems Modeling, Reservoir Simulation, And Economic Analysis
.
Degree: 2016, Cornell University
URL: http://hdl.handle.net/1813/44328
► Performance of low-temperature geothermal energy systems has been investigated though systems modeling, reservoir simulation, and economic analysis. Both utilization of deep geothermal energy with focus…
(more)
▼ Performance of low-temperature geothermal energy systems has been investigated though systems modeling, reservoir simulation, and economic analysis. Both utilization of deep geothermal energy with focus on direct-use
heat though Enhanced Geothermal Systems (EGS) and shallow geothermal energy exploited with hybrid
heat pump systems have been studied. To assess power output and economic competitiveness of deep geothermal energy for production of
heat and/or electricity, a computer tool GEOPHIRES has been developed which combines cost correlations and economic models with reservoir, wellbore, and surface plant models. Simulations show that low-grade EGS resources (with geothermal gradients of ~30? C/km) are unattractive for solely electricity production with estimated levelized costs of electricity between 20 and 60 ¢/kWhe . Utilizing low-grade resources instead for low-temperature (<120? C) direct-use
heat applications, results in competitive levelized costs of
heat (LCOH) between 6 and 14 $/MMBTU (2.0 and 4.8 ¢/kWhth ). Given that low-grade resources are widely available and the market for low-temperature
heat is significant, geothermal energy becoming a major low-temperature
heat supplier should be considered. To evaluate the energetic and economic performance of hybrid geothermal
heat pump (
GSHP) systems for cooling-dominated applications, a TRNSYS systems model has been developed and validated with data collected at a full-size experimental hybrid
GSHP system providing cooling for a Verizon Wireless cellular tower shelter in Varna, NY with average continuous cooling load of 11 kWth . Simulations indicate that for the Varna Site weather and operational conditions in the base case scenario,
GSHP-based systems allow the owner to save up to 30% of lifetime electricity consumption in comparison with airsource
heat pump (ASHP)-based systems. However, mainly because of lower upfront capital costs, ASHP-based systems can have up to 10% lower total cost of ownership. A novel approach for simulating transient
heat transfer with slender bodies in a conductive medium, e.g. geothermal wells and slinky-coil
heat exchangers, using the slender-body theory (SBT) has been developed. An efficient numerical implementation is obtained based on a judicious choice of the discrete elements used to represent the body and implementation of the Fast Multipole Method (FMM). The SBT requires a onedimensional spatial discretization only along the axis of the body in contrast to the threedimensional discretization for finite element models. Two case studies,
heat transfer from two parallel cylinders and
heat transfer from a slinky-coil
heat exchanger, are used to show the speed and accuracy of the SBT model and its ability to model interacting slender bodies of finite length and bodies with centerline curvature and internal advective
heat flow.
Advisors/Committee Members: Koch,Donald L (committeeMember), Jordan,Teresa Eileen (committeeMember).
Subjects/Keywords: Low-Temperature Geothermal Energy;
Enhanced Geothermal Systems;
Hybrid Ground-Source Heat Pump Systems
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Manager
APA (6th Edition):
Beckers, K. (2016). Low-Temperature Geothermal Energy: Systems Modeling, Reservoir Simulation, And Economic Analysis
. (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/44328
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Beckers, Koenraad. “Low-Temperature Geothermal Energy: Systems Modeling, Reservoir Simulation, And Economic Analysis
.” 2016. Thesis, Cornell University. Accessed December 14, 2019.
http://hdl.handle.net/1813/44328.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Beckers, Koenraad. “Low-Temperature Geothermal Energy: Systems Modeling, Reservoir Simulation, And Economic Analysis
.” 2016. Web. 14 Dec 2019.
Vancouver:
Beckers K. Low-Temperature Geothermal Energy: Systems Modeling, Reservoir Simulation, And Economic Analysis
. [Internet] [Thesis]. Cornell University; 2016. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/1813/44328.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Beckers K. Low-Temperature Geothermal Energy: Systems Modeling, Reservoir Simulation, And Economic Analysis
. [Thesis]. Cornell University; 2016. Available from: http://hdl.handle.net/1813/44328
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
30.
Rhoda, Benjamin.
Investigation of Pumping and Piping System Design for Commercial Ground Source Heat Pumps.
Degree: Mechanical Engineering, 2013, Oklahoma State University
URL: http://hdl.handle.net/11244/15087
► This study focused on the simulation of previously researched design methodologies and pumping strategies and compared them in detailed simulations to see the impacts of…
(more)
▼ This study focused on the simulation of previously researched design methodologies and pumping strategies and compared them in detailed simulations to see the impacts of certain designs on the performance of the pumping energy and the performance of the
heat pumps. This included both direct and reverse return systems, pipe sizing criteria, central and distributed pumping, and a combined central with distributed pumping, the effects of differential temperature set point, and differential pressure set point. This study also compared the traditional two-pipe distribution
system to the one-pipe distribution
system. Through the analysis, the most important factor in pumping performance was the control mechanisms used and
pump efficiency. The variance in energy consumption between the four configurations that were studied was at most 7%. Using 0.61 m (2 ft) of head loss per 30.5 m (100 ft) of pipe as a pipe sizing technique was the transition point for the pumping power to go from a `B' to an `A' grade. Ensuring the
pump is equipped to be shut off when no
heat pumps are operating can save significant amounts of energy. The one-pipe
system had the lowest pumping energy of all four configurations but also had the highest
heat pump energy consumption. As a result, the one-pipe
system consumed the most energy for all four locations that were analyzed. The best performing
system in all four locations was the two-pipe configuration with distributed-pumping-with-hydraulic-separation assuming a circulator pumping efficiency of 50% as is attainable with ECM pumps. The temperature differential set point to control the
ground loop fluid flow rate varied depending on the location. If a standard induction motor
pump is used, the two-pipe
system with central pumping was the best performing configuration.
Advisors/Committee Members: Spitler, Jeffrey D. (advisor), Fisher, Daniel (committee member), Cremaschi, Lorenzo (committee member).
Subjects/Keywords: ground source heat pump; pumping
…ix
NOMENCLATURE
GSHP – Ground Source Heat Pump
LCC – Life Cycle Cost
HVAC – Heating… …Source Heat Pump (GSHP) takes advantage of the earth’s ground temperature
remaining… …Once a heat pump has been selected, the flow rate of a GSHP system is determined by
how many… …heat is
either absorbed by or dissipated from a facility via a water source heat pump. The… …water source
heat pump provides heating and cooling by absorbing or dissipating heat from a…
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APA (6th Edition):
Rhoda, B. (2013). Investigation of Pumping and Piping System Design for Commercial Ground Source Heat Pumps. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/15087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rhoda, Benjamin. “Investigation of Pumping and Piping System Design for Commercial Ground Source Heat Pumps.” 2013. Thesis, Oklahoma State University. Accessed December 14, 2019.
http://hdl.handle.net/11244/15087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rhoda, Benjamin. “Investigation of Pumping and Piping System Design for Commercial Ground Source Heat Pumps.” 2013. Web. 14 Dec 2019.
Vancouver:
Rhoda B. Investigation of Pumping and Piping System Design for Commercial Ground Source Heat Pumps. [Internet] [Thesis]. Oklahoma State University; 2013. [cited 2019 Dec 14].
Available from: http://hdl.handle.net/11244/15087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rhoda B. Investigation of Pumping and Piping System Design for Commercial Ground Source Heat Pumps. [Thesis]. Oklahoma State University; 2013. Available from: http://hdl.handle.net/11244/15087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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