subject:(Borehole Heat Exchanger BHE )

Delft University of Technology

1. Caballero Hernandez, Enrique (author). In situ experimentation and numerical model validation of thermal flow in shallow crystalline rock, Otaniemi case.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:de329bb1-e218-40ff-9016-7c34b8ea5fd5

► Nowadays more attention to environmental-friendly sources of energy has been given, aiming to slow down and counteract the damage to the ecosystem product of the… (more)

▼ Nowadays more attention to environmental-friendly sources of energy has been given, aiming to slow down and counteract the damage to the ecosystem product of the abuse of fossil fuels. Different technologies on energy production, solar, wind, tidal, geothermic, etc., have been researched with the additional challenge of how to store it. From the different types of energy, heat represents a basic need in countries where the climate conditions lead to long and cold periods, namely countries at high latitudes where a big part of the produced energy is destined to household and district heating. The Academy of Finland implemented the New Solar Community Concept project to research the development and application of alternative technologies for production and storage of energy. The use of the local geological domains has been considered as a possible solution for seasonal and long-term energy storage, specifically heat. Aalto University participates in Tackling the challenges of a Solar-Community Concept in High Latitudes by researching the seasonal storage of thermal energy in the ground simulating and assessing thermal flow for different borehole heat exchangers arrays. To do this, numerical models have been implemented, special attention to the Weak Form Equations (WFE) and the Heat Transfer in Pipes (HTiP) models. These models are evaluated using the COSMOL® Multiphysics software, each of them with advantages and disadvantages over the other. An in situ experiment has been performed in Aalto’s research tunnel to validate the results of the numerical models. The aim of the experiment was to assess the performance of the models based on the result comparison between the simulated and the observed data under controlled conditions. The experiment consisted of a single U-pipe borehole heat exchanger operating under seasonal conditions. Two phases were defined, heating and cooling. In the first phase, a constant heat flux is provided to the rock by circulating a heated carrier fluid in the BHE. In the second phase, the circulation is stopped allowing the rock to cool down under normal conditions. The heat field in the rock was tracked with a monitoring borehole one meter away from the heat source. Several digital temperature sensors were installed at the monitoring point in customized equipment referred in this work as Thermal Multisensor Probes for this purpose. The comparison made between model and observed results returned an acceptable accuracy of the predicted values of the models for the heat flow in the rock mass. Additionally, it was identified the WFE model can be improved by calibrating the borehole thermal resistance parameter in the equations, parameter that must come from experimental data. Finally, it was seen that the few discontinuities present across the boreholes had a low impact on the flow of heat through the rock for this experiment. Currently, the tuning of the numerical models is being performed at Aalto University by increasing the weight of different parameters in the… Advisors/Committee Members: Heimovaara, Timo (mentor), Rinne, M. (mentor), Siren, Topias (graduation committee), Janiszewski, Mateusz (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Borehole Heat Exchanger (BHE); numerical modelling; model validation; in situ experiment; heat flow; seasonal storage

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Caballero Hernandez, E. (. (2017). In situ experimentation and numerical model validation of thermal flow in shallow crystalline rock, Otaniemi case. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:de329bb1-e218-40ff-9016-7c34b8ea5fd5

Chicago Manual of Style (16^th Edition):

Caballero Hernandez, Enrique (author). “In situ experimentation and numerical model validation of thermal flow in shallow crystalline rock, Otaniemi case.” 2017. Masters Thesis, Delft University of Technology. Accessed January 19, 2021. http://resolver.tudelft.nl/uuid:de329bb1-e218-40ff-9016-7c34b8ea5fd5.

MLA Handbook (7^th Edition):

Caballero Hernandez, Enrique (author). “In situ experimentation and numerical model validation of thermal flow in shallow crystalline rock, Otaniemi case.” 2017. Web. 19 Jan 2021.

Vancouver:

Caballero Hernandez E(. In situ experimentation and numerical model validation of thermal flow in shallow crystalline rock, Otaniemi case. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Jan 19]. Available from: http://resolver.tudelft.nl/uuid:de329bb1-e218-40ff-9016-7c34b8ea5fd5.

Council of Science Editors:

Caballero Hernandez E(. In situ experimentation and numerical model validation of thermal flow in shallow crystalline rock, Otaniemi case. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:de329bb1-e218-40ff-9016-7c34b8ea5fd5

Delft University of Technology

2. Panteli, Nefeli (author). Assessment of the effect of groundwater flow on the performance of Borehole Thermal Energy Storage systems.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:c590ae66-5236-429c-baaa-078cf36bff21

► In a Borehole Thermal Energy Storage (BTES) system, heat is extracted from or injected to the subsurface, taking advantage of the relatively constant temperatures of… (more)

▼ In a Borehole Thermal Energy Storage (BTES) system, heat is extracted from or injected to the subsurface, taking advantage of the relatively constant temperatures of the underground. Both thermal conduction and advection can influence the performance of BTES systems, but thermal advection is often neglected in the design process. However, in areas with groundwater flow, the heat exchange between the BTES system and the soil can be significantly affected, as the stored heat is transported from the borehole with the flow. This project studies the influence of groundwater flow on the performance of a BTES system. A detailed 3D numerical model is created using MODFLOW and MT3D to simulate groundwater flow and heat transfer under various conditions. The model is verified using an analytical solution as well as experimental data, and is subsequently used to perform a sensitivity analysis and simulate a case study, in order to gain insight on the influence of groundwater flow on the heat exchange process and the conditions that favor this effect. The results reveal that groundwater flow is enhancing the heat exchange rates both in heating and in cooling mode. The magnitude of the effect depends on the total groundwater discharge, and the porosity and background temperature of the soil. In cases of combined heating and cooling, the effect also depends on the magnitude and ratio of the injected and extracted energy loads, as well as the frequency of switching between storage and extraction. Finally, it is revealed that groundwater flow is beneficial for systems with unbalanced energy loads, as it counterbalances the net heat extraction or injection that could decrease the system’s heat exchange capacity in the long term. Advisors/Committee Members: Bakker, Mark (mentor), des Tombe, Bas (graduation committee), Bloemendal, Martin (graduation committee), Vardon, Phil (graduation committee), Witte, Henk (graduation committee), de Winkel, Frank (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: groundwater; BTES; geothermal energy; groundwater modelling; MODFLOW; MT3DMS; heat exchangers; Borehole Heat Exchanger (BHE)

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Panteli, N. (. (2018). Assessment of the effect of groundwater flow on the performance of Borehole Thermal Energy Storage systems. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:c590ae66-5236-429c-baaa-078cf36bff21

Chicago Manual of Style (16^th Edition):

Panteli, Nefeli (author). “Assessment of the effect of groundwater flow on the performance of Borehole Thermal Energy Storage systems.” 2018. Masters Thesis, Delft University of Technology. Accessed January 19, 2021. http://resolver.tudelft.nl/uuid:c590ae66-5236-429c-baaa-078cf36bff21.

MLA Handbook (7^th Edition):

Panteli, Nefeli (author). “Assessment of the effect of groundwater flow on the performance of Borehole Thermal Energy Storage systems.” 2018. Web. 19 Jan 2021.

Vancouver:

Panteli N(. Assessment of the effect of groundwater flow on the performance of Borehole Thermal Energy Storage systems. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 19]. Available from: http://resolver.tudelft.nl/uuid:c590ae66-5236-429c-baaa-078cf36bff21.

Council of Science Editors:

Panteli N(. Assessment of the effect of groundwater flow on the performance of Borehole Thermal Energy Storage systems. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:c590ae66-5236-429c-baaa-078cf36bff21

Delft University of Technology

3. Koenders, David (author). Interaction between UTES systems: A simulation study to asses the effect of Aquifer Thermal Energy Storage systems on the efficiency of Borehole Heat Exchangers.

Degree: 2020, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:cb04b092-26da-443f-be08-14107dcac863

►

Underground thermal energy storage (UTES) is an efficient technique to fulfill the heating and cooling demand of buildings. UTES uses stable subsurface temperatures store and… (more)

▼

Underground thermal energy storage (UTES) is an efficient technique to fulfill the heating and cooling demand of buildings. UTES uses stable subsurface temperatures store and extract energy. This study covers two types of UTES systems: aquifer thermal energy systems (ATES) and borehole heat exchangers (BHE). UTES systems in the Netherlands have seen a significant growth over the past years (Bloemendal, 2018) and are expected to contribute up to 20% of the heating and cooling demand of buildings by 2050 (Naber et al., 2016). As more UTES systems are installed, the risk of unwanted interaction between different system increases. However, ATES-BHE interaction is largely unknown. The objective of this study is to gather more insight in the interaction of ATES system on the efficiency of BHE systems. A numerical model is used to simulate an ATES well near a BHE system using SEAWAT (Langevin et al., 2008). The model is used to run different simulations, from which the efficiency of a BHE system is computed under different circumstances over a five year period. Four conclusions are drawn from the results. First, groundwater and temperature interference from ATES systems affect the efficiency of a BHE system differently. Simulations show that the effect of groundwater flow induced by an ATES system always has a positive effect on the efficiency of a BHE system. The effect of temperature interference is dependent on the temperature of the ATES well. Groundwater was also found to interfere at larger distances between both systems compared to temperature. Second, the degree of interference is related to the distance between the ATES and BHE system. For distances smaller than 0.5 times the thermal radius of the ATES system, interference from temperature was found to be dominant in the simulations. For distances larger than 0.5 times the thermal radius of the ATES system, groundwater interference was found to be the dominant factor. The third conclusion is that the depth placement of the ATES well screen has little to no effect on the amount of interference on the BHE system. Fourth, it is important to realize that no energy is spontaneously generated or lost as BHE efficiencies increase or decrease respectively. Energy is simply exchanged between the ATES and BHE system through the subsurface. Whether that is disadvantageous depends on the energy demands of both systems. Most energy demands are imbalanced, meaning either cooling or heating demand is larger than the other. It is recommended to consider UTES system installations from a holistic point of view.

Civil Engineering | Water Management

Advisors/Committee Members: Bloemendal, J.M. (mentor), Hartog, Niels (mentor), Bakker, M. (graduation committee), Vardon, P.J. (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Aquifer Thermal Energy Storage (ATES); Borehole Heat Exchanger (BHE); Numerical model; interference; Groundwater flow

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Koenders, D. (. (2020). Interaction between UTES systems: A simulation study to asses the effect of Aquifer Thermal Energy Storage systems on the efficiency of Borehole Heat Exchangers. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:cb04b092-26da-443f-be08-14107dcac863

Chicago Manual of Style (16^th Edition):

Koenders, David (author). “Interaction between UTES systems: A simulation study to asses the effect of Aquifer Thermal Energy Storage systems on the efficiency of Borehole Heat Exchangers.” 2020. Masters Thesis, Delft University of Technology. Accessed January 19, 2021. http://resolver.tudelft.nl/uuid:cb04b092-26da-443f-be08-14107dcac863.

MLA Handbook (7^th Edition):

Koenders, David (author). “Interaction between UTES systems: A simulation study to asses the effect of Aquifer Thermal Energy Storage systems on the efficiency of Borehole Heat Exchangers.” 2020. Web. 19 Jan 2021.

Vancouver:

Koenders D(. Interaction between UTES systems: A simulation study to asses the effect of Aquifer Thermal Energy Storage systems on the efficiency of Borehole Heat Exchangers. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Jan 19]. Available from: http://resolver.tudelft.nl/uuid:cb04b092-26da-443f-be08-14107dcac863.

Council of Science Editors:

Koenders D(. Interaction between UTES systems: A simulation study to asses the effect of Aquifer Thermal Energy Storage systems on the efficiency of Borehole Heat Exchangers. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:cb04b092-26da-443f-be08-14107dcac863

Karlstad University

4. 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)

Subjects/Keywords: heat pump system; ground-coupled; ground source; combination; dual; horizontal; vertical; borehole heat exchanger; BHE; complementary source; flow control

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th 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 January 19, 2021. 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 (7^th Edition):

Denker, Richard. “Dimensioning and control for heat pump systems using a combination of vertical and horizontal ground-coupled heat exchangers.” 2015. Web. 19 Jan 2021.

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 2021 Jan 19]. 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

Uppsala University

5. Westin, Rasmus. Värmeöverföring i bergvärmesystem : En numerisk analys av den ringformade koaxiala borrhålsvärmeväxlaren.

Degree: Electricity, 2012, Uppsala University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176915

► The borehole heat exchangers of today suffer from poor thermal and hydrodynamic performance. The purpose of this thesis is to improve the performance of… (more)

Subjects/Keywords: annular coaxial borehole heat exchanger; ground source heat pump; BHE; CBHE; thermal borehole resistance; Koaxial borrhålsvärmeväxlare; borrhålsmotstånd; värmepump; bergvärme; bergkyla; termisk prestanda

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Westin, R. (2012). Värmeöverföring i bergvärmesystem : En numerisk analys av den ringformade koaxiala borrhålsvärmeväxlaren. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176915

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Westin, Rasmus. “Värmeöverföring i bergvärmesystem : En numerisk analys av den ringformade koaxiala borrhålsvärmeväxlaren.” 2012. Thesis, Uppsala University. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176915.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Westin, Rasmus. “Värmeöverföring i bergvärmesystem : En numerisk analys av den ringformade koaxiala borrhålsvärmeväxlaren.” 2012. Web. 19 Jan 2021.

Vancouver:

Westin R. Värmeöverföring i bergvärmesystem : En numerisk analys av den ringformade koaxiala borrhålsvärmeväxlaren. [Internet] [Thesis]. Uppsala University; 2012. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176915.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Westin R. Värmeöverföring i bergvärmesystem : En numerisk analys av den ringformade koaxiala borrhålsvärmeväxlaren. [Thesis]. Uppsala University; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176915

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

De Montfort University

6. 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)

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th Edition):

Naicker, Selvaraj Soosaiappa. “Performance analysis of a large-scale ground source heat pump system.” 2015. Doctoral Dissertation, De Montfort University. Accessed January 19, 2021. http://hdl.handle.net/2086/12265.

MLA Handbook (7^th Edition):

Naicker, Selvaraj Soosaiappa. “Performance analysis of a large-scale ground source heat pump system.” 2015. Web. 19 Jan 2021.

Vancouver:

Naicker SS. Performance analysis of a large-scale ground source heat pump system. [Internet] [Doctoral dissertation]. De Montfort University; 2015. [cited 2021 Jan 19]. 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

KTH

7. Monzó, Patricia. Comparison of different Line Source Model approaches for analysis of Thermal Response Test in a U-pipe Borehole heat Exchanger.

Degree: Applied Thermodynamics and Refrigeration, 2011, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-72834

► Ground Source Heat Pumps (GHSPs) is a relevant application and around 3 million installations are setting up at the beginning of 2010 (IEA ECES… (more)

Subjects/Keywords: Borehole Thermal Energy Storage; Borehole Heat Exchanger; Ground Heat Pump System; Thermal Response Test

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Monzó, P. (2011). Comparison of different Line Source Model approaches for analysis of Thermal Response Test in a U-pipe Borehole heat Exchanger. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-72834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Monzó, Patricia. “Comparison of different Line Source Model approaches for analysis of Thermal Response Test in a U-pipe Borehole heat Exchanger.” 2011. Thesis, KTH. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-72834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Monzó, Patricia. “Comparison of different Line Source Model approaches for analysis of Thermal Response Test in a U-pipe Borehole heat Exchanger.” 2011. Web. 19 Jan 2021.

Vancouver:

Monzó P. Comparison of different Line Source Model approaches for analysis of Thermal Response Test in a U-pipe Borehole heat Exchanger. [Internet] [Thesis]. KTH; 2011. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-72834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Monzó P. Comparison of different Line Source Model approaches for analysis of Thermal Response Test in a U-pipe Borehole heat Exchanger. [Thesis]. KTH; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-72834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

KTH

8. 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)

Subjects/Keywords: Thermal Response Test; Borehole Heat Exchanger; Ground Source Heat Pump

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th Edition):

Kamarad, Anthony. “Design and construction of a mobile equipment for thermal response test in borehole heat exchangers.” 2012. Thesis, KTH. Accessed January 19, 2021. 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 (7^th Edition):

Kamarad, Anthony. “Design and construction of a mobile equipment for thermal response test in borehole heat exchangers.” 2012. Web. 19 Jan 2021.

Vancouver:

Kamarad A. Design and construction of a mobile equipment for thermal response test in borehole heat exchangers. [Internet] [Thesis]. KTH; 2012. [cited 2021 Jan 19]. 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 Windsor

9. Gordon, David Tyler. Analytical and Experimental Study on Coaxial Borehole Heat Exchangers.

Degree: MA, Mechanical, Automotive, and Materials Engineering, 2017, University of Windsor

URL: https://scholar.uwindsor.ca/etd/6598

► This research focuses on methods of direct-use geothermal energy considering a coaxial borehole heat exchanger (BHE) as a major component in a ground-source heat pump… (more)

▼ This research focuses on methods of direct-use geothermal energy considering a coaxial borehole heat exchanger (BHE) as a major component in a ground-source heat pump (GSHP) system. A GSHP system is a sustainable energy system that transfers thermal energy between the surrounding ground and the conditioned space of a building. Various methods exist to accomplish the ground-side heat exchange for a GSHP, where the focus of this thesis remains on closed-loop systems which utilize loops of fused high-density polyethylene (HDPE) pipes buried vertically in boreholes ranging between 80 and 200 meters deep. This thesis provides an overview of the critical design considerations used in sizing a BHE where a comparison is made between a typical U-tube BHE and a thermally improved coaxial BHE where various benefits may be realized by the latter. The motivation for this research is to provide a tool to accurately compare various coaxial systems, where a semi-analytical model for heat transfer is proposed. The proposed model, referred to as the composite coaxial (CCx) model, is semi-analytical in nature being that it relies on a curve-fitted cylindrical response function, or g-function. The CCx model is made to produce accurate simulations for the fluid temperature measured at the outlet of a coaxial BHE over the course of a typical thermal response test (TRT). The model considers coaxial configurations where the inner and outer pipes may have differing thermal properties, diameters, and thicknesses. The model is validated using known input parameters and physical measured temperature data for three different TRTs showing root mean square errors (RMSE) as low as 0.09 °C, which is well within the uncertainty of the measurement for the given test. The general development of the model is largely empirical in nature, where various aspects were introduced keeping logical constraints in mind to produce an acceptable fit to each of the three physical tests. Further experimental analysis is performed using a lab-scale coaxial heat exchanger to verify the trends produced by the CCx model during short term operation considering laminar annular flow. The measured outlet fluid temperature is again compared to the temperature simulated by the CCx model showing an RMSE of 0.16 °C, which is again found to be within the uncertainty of the measurement. In summary, the primary contribution of this research is the CCx model itself, where this model has been developed as a tool for future use in the case-by-case optimization of coaxial systems. This model is capable of capturing the effect of various pipe materials and sizes as shown through the validation presented in this thesis. Advisors/Committee Members: Ting, David, Bolisetti, Tirupati.

Subjects/Keywords: Borehole heat exchanger; Coaxial borehole; Composite coaxial model; Cylindrical source model; Geothermal; Thermal response test

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gordon, D. T. (2017). Analytical and Experimental Study on Coaxial Borehole Heat Exchangers. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/6598

Chicago Manual of Style (16^th Edition):

Gordon, David Tyler. “Analytical and Experimental Study on Coaxial Borehole Heat Exchangers.” 2017. Masters Thesis, University of Windsor. Accessed January 19, 2021. https://scholar.uwindsor.ca/etd/6598.

MLA Handbook (7^th Edition):

Gordon, David Tyler. “Analytical and Experimental Study on Coaxial Borehole Heat Exchangers.” 2017. Web. 19 Jan 2021.

Vancouver:

Gordon DT. Analytical and Experimental Study on Coaxial Borehole Heat Exchangers. [Internet] [Masters thesis]. University of Windsor; 2017. [cited 2021 Jan 19]. Available from: https://scholar.uwindsor.ca/etd/6598.

Council of Science Editors:

Gordon DT. Analytical and Experimental Study on Coaxial Borehole Heat Exchangers. [Masters Thesis]. University of Windsor; 2017. Available from: https://scholar.uwindsor.ca/etd/6598

KTH

10. BÖRJESSON, MARCUS. Performance evaluation of ground source heat pump heating systems in Stockholm.

Degree: Industrial Engineering and Management (ITM), 2020, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286000

►

GSHP systems are common in Sweden but there are few evaluations quantifying the performance of the systems and highlighting problem that occurs during operations. The… (more)

▼

GSHP systems are common in Sweden but there are few evaluations quantifying the performance of the systems and highlighting problem that occurs during operations. The research project Annex 52 Long-term performance measurement of GSHP systems serving commercial, institutional and multifamily building part of IEA HPT TCP proves the need to systematically be able to evaluate GSHP systems. This thesis aims to expand the knowledge of how to evaluate GSHP systems and provide case studies for Annex 52. Three residential ground source heating systems used for heating has been evaluated and analyzed in this study. The evaluation has consisted of three parts. The first part analyzes the operation and stability of the GSHP systems. The second part consist of a detailed study of the performance of the GSHP systems. The seasonal performance factor has been calculated for different system boundaries based on the work done by SEPEMO. In addition, a method on how to evaluate the efficiency of the heat pumps based on the two temperature levels, source side temperature and the heat sink temperature, that the heat pump is operating at throughout a year has been developed within this thesis. This has included a method on how to normalize the temperatures based on the operation of the heat pump in order to quantify one temperature for each the two temperature levels. The third part consist of a comparison of the mean secondary fluid temperature between the calculated temperature using the software EED and the measured temperatures. This includes a comparison evaluation and sensitivity analysis on input parameters during the design of the borehole heat exchanger fields. This study has expanded the available reference cases of GSHP systems in Sweden. It also can be used as a guideline for those who will evaluate future GSHP systems. Designers of GSHP system will also benefit from the recommendations listed in this thesis regarding instrumentation and possible problems that may occur. The results show that the evaluation successfully managed to quantify the performance and operational issues that have occurred for each system. The method developed in this study was able to quantify the operation of the different systems based on the temperature levels and can be used for future GSHP evaluations of similar system type.

Bergvärmesystem är vanligt förekommande i Sverige men trots detta finns det få studier där prestandan har utvärderats och de vanligt förekommande problemen under drift har belysts. Forskningsprojektet Annex 52 Annex 52 Long-term performance measurement of GSHP systems serving commercial, institutional and multi-family building som är en del av IEA HPT TCP visar på behovet av att systematisk utvärdera bergvärmesystem. Detta examensarbete syftar till att utveckla och bidra till kunskap om hur bergvärmesystem kan utvärderas och att bidra med exempelstudier till Annex 52. Inom detta examensarbete har tre bergvärmesystem som betjänar flerbostadshus utvärderats och analyserats. Utvärderingen bestod av…

Subjects/Keywords: Ground source heat pump system; GSHP system; vertical borehole; ground heat exchanger; BHE; EED; evaluation; COP; SPF; Ideal temperature dependent SPF; temperature dependent SPF efficiency; SEPEMO; Sweden; Bergvärmesystem; borrhål; kollektor; EED; utvärdering; COP; SPF; ideal temperaturberoende SPF; temperaturberoende SPF-verkningsgrad; SEPEMO; Sverige; Engineering and Technology; Teknik och teknologier

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

BÖRJESSON, M. (2020). Performance evaluation of ground source heat pump heating systems in Stockholm. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286000

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

BÖRJESSON, MARCUS. “Performance evaluation of ground source heat pump heating systems in Stockholm.” 2020. Thesis, KTH. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286000.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

BÖRJESSON, MARCUS. “Performance evaluation of ground source heat pump heating systems in Stockholm.” 2020. Web. 19 Jan 2021.

Vancouver:

BÖRJESSON M. Performance evaluation of ground source heat pump heating systems in Stockholm. [Internet] [Thesis]. KTH; 2020. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286000.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

BÖRJESSON M. Performance evaluation of ground source heat pump heating systems in Stockholm. [Thesis]. KTH; 2020. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286000

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

KTH

11. GUILLAUME, François. Analysis of a novel CBHE.

Degree: Applied Thermodynamics and Refrigeration, 2011, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35387

Subjects/Keywords: CBHE Coaxial Borehole Heat Exchanger

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

GUILLAUME, F. (2011). Analysis of a novel CBHE. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35387

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

GUILLAUME, François. “Analysis of a novel CBHE.” 2011. Thesis, KTH. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35387.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

GUILLAUME, François. “Analysis of a novel CBHE.” 2011. Web. 19 Jan 2021.

Vancouver:

GUILLAUME F. Analysis of a novel CBHE. [Internet] [Thesis]. KTH; 2011. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35387.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

GUILLAUME F. Analysis of a novel CBHE. [Thesis]. KTH; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35387

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

De Montfort University

12. He, Miaomiao. Numerical modelling of geothermal borehole heat exchanger systems.

Degree: PhD, 2012, De Montfort University

URL: http://hdl.handle.net/2086/5990

► The large proportion of energy used in the built environment has made improving energy efficiency in buildings, in particular their heating, ventilation, and air conditioning… (more)

▼ The large proportion of energy used in the built environment has made improving energy efficiency in buildings, in particular their heating, ventilation, and air conditioning (HVAC) systems, a policy objective for reducing energy consumption and CO2 emissions nationally and internationally. Ground source heat pump (GSHP) systems, due to their high coefficient of performance (COP) and low CO2 emissions are consequently, receiving increasing attention. This work is concerned with the modelling of borehole heat exchangers (BHEs), the commonest form of ground heat exchangers found in GSHP systems. Their careful design is critical to both the short timescale and long timescale performance of geothermal heat pump systems. Unlike conventional components of HVAC systems, BHEs cannot be designed on the basis of peak load data but require 3 application of dynamic thermal models that are able to take account of the heat transfer inside the borehole as well as the surrounding ground. The finite volume method has been applied to develop a dynamic three-dimensional (3D) model for a single BHE and BHE arrays. The multi-block boundary fitted structured mesh used in this model allows the complex geometries around the pipes in BHEs and the surrounding ground around the borehole to be represented exactly. The transport of the fluid circulating along the pipe loop has been simulated explicitly in this model. The ground underneath the borehole has also been represented in this model. Validation of the 3D model has been carried out by reference to analytical models of borehole thermal resistance and fluid transport in pipes, as well as experimental data. In this work, the 3D numerical model has been applied to investigate the three-dimensional characteristics of heat transfer in and around a BHE at both short and long timescales. By implementing a two-dimensional (2D) model using the same numerical method and comparing the simulation results from the 3D and 2D models, the most significant three-dimensional effects have been identified and quantified. The findings have highlighted some of the limitations of 2D models, and based on the findings, methods to improve the accuracy of a 2D model have been suggested and validated. Furthermore, the 3D and 2D finite volume models have been applied to simulate an integrated GSHP system and their effects on overall system performance predictions have been investigated. The 3D numerical model has also been applied to examine thermal interactions within BHE arrays and to evaluate the assumptions of the line source model and their implications in the analysis of thermal response test data.

Subjects/Keywords: 333.79; geothermal energy; borehole heat exchanger; numerical modelling

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

He, M. (2012). Numerical modelling of geothermal borehole heat exchanger systems. (Doctoral Dissertation). De Montfort University. Retrieved from http://hdl.handle.net/2086/5990

Chicago Manual of Style (16^th Edition):

He, Miaomiao. “Numerical modelling of geothermal borehole heat exchanger systems.” 2012. Doctoral Dissertation, De Montfort University. Accessed January 19, 2021. http://hdl.handle.net/2086/5990.

MLA Handbook (7^th Edition):

He, Miaomiao. “Numerical modelling of geothermal borehole heat exchanger systems.” 2012. Web. 19 Jan 2021.

Vancouver:

He M. Numerical modelling of geothermal borehole heat exchanger systems. [Internet] [Doctoral dissertation]. De Montfort University; 2012. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/2086/5990.

Council of Science Editors:

He M. Numerical modelling of geothermal borehole heat exchanger systems. [Doctoral Dissertation]. De Montfort University; 2012. Available from: http://hdl.handle.net/2086/5990

Linköping University

13. Ramanathan, Sriram. Sensitivity Analysis and Optimization of the Vertical GSHP (Ground source heat pump).

Degree: Applied Thermodynamics and Fluid Mechanics, 2020, Linköping University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-171867

► GSHP (Ground source heat pump), uses geothermal energy which is a form of green and sustainable energy. Geothermal energy is also a continuous source… (more)

▼ GSHP (Ground source heat pump), uses geothermal energy which is a form of green and sustainable energy. Geothermal energy is also a continuous source of energy, unlike wind energy. The results from this thesis work will be applicable for both GSHP that are being used for space heating, and the ones which have a bottom organic Rankine cycle. The bottom organic Rankine cycle and continuous energy production of GSHP make it a potential source for electricity generation. The GSHP is of various types, in regard to the configuration of the pipe and their setup in the ground and also based on their grouting. In this study only vertical GSHP and with a single u-tube and water filled grout will be analyzed. The GSHP performance is based on a number of parameters including, the depth of the heat exchanging unit in the ground, other key dimensions of the unit like diameter and outer wall thickness, the fluid flow, and the type of working fluid. Therefore it becomes necessary to study the effect of all of these parameters individually and their individual effect on the energy output and the performance of the BHE. One of the thesis objectives is to establish a sensitivity analysis of the BHE based on the above mention parameters and then further optimize the design with the heat enhancement devices. The major findings of this thesis work are how shank spacing (spacing between the inlet and the outlet pipe) affects the heat transfer in the BHE. The shank spacing seems to reduce the energy output of the GSHP, this is contrary to the high conductive solid grout, where the shank spacing doesn't affect the BHE so much. The diameter of the BHE in the water-filled grout has a completely opposite effect from the solid grout. Increasing the depth of the BHE after a certain length only increases the entropy of the system which reduces the energy output. The working fluid with a higher Prandtl number helps in higher energy output. The optimization results suggest that having a deeper borehole is not very energy efficient in spite of the greater thermal gradient available at a higher depth.

Subjects/Keywords: GSHP; Borehole heat exchanger; Geo-thermal energy.; Energy Engineering; Energiteknik

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ramanathan, S. (2020). Sensitivity Analysis and Optimization of the Vertical GSHP (Ground source heat pump). (Thesis). Linköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-171867

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ramanathan, Sriram. “Sensitivity Analysis and Optimization of the Vertical GSHP (Ground source heat pump).” 2020. Thesis, Linköping University. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-171867.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ramanathan, Sriram. “Sensitivity Analysis and Optimization of the Vertical GSHP (Ground source heat pump).” 2020. Web. 19 Jan 2021.

Vancouver:

Ramanathan S. Sensitivity Analysis and Optimization of the Vertical GSHP (Ground source heat pump). [Internet] [Thesis]. Linköping University; 2020. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-171867.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ramanathan S. Sensitivity Analysis and Optimization of the Vertical GSHP (Ground source heat pump). [Thesis]. Linköping University; 2020. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-171867

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universitat Politècnica de València

14. 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

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th 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 January 19, 2021. http://hdl.handle.net/10251/125696.

MLA Handbook (7^th 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. 19 Jan 2021.

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 2021 Jan 19]. 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

15. Wajman, Michal. Technical and Economical Analysis of Ground Source Heat Pump Systems with BHE in Poland.

Degree: Applied Thermodynamics and Refrigeration, 2011, KTHKTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33642

► Nowadays, Ground Source Heat Pumps (GSHPs) are more frequently acting as a main or the only device covering the building heat/cool demand. The most… (more)

Subjects/Keywords: Ground Source Heat Pumps; Borehole Heat Exchanger; Mechanical engineering; Maskinteknik; Environmental engineering; Miljöteknik

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wajman, M. (2011). Technical and Economical Analysis of Ground Source Heat Pump Systems with BHE in Poland. (Thesis). KTHKTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33642

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wajman, Michal. “Technical and Economical Analysis of Ground Source Heat Pump Systems with BHE in Poland.” 2011. Thesis, KTHKTH. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33642.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wajman, Michal. “Technical and Economical Analysis of Ground Source Heat Pump Systems with BHE in Poland.” 2011. Web. 19 Jan 2021.

Vancouver:

Wajman M. Technical and Economical Analysis of Ground Source Heat Pump Systems with BHE in Poland. [Internet] [Thesis]. KTHKTH; 2011. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33642.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wajman M. Technical and Economical Analysis of Ground Source Heat Pump Systems with BHE in Poland. [Thesis]. KTHKTH; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33642

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

KTH

16. 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)

Subjects/Keywords: ground source heat pump; borehole heat exchanger; g-function; analytical solution; temperature prediction

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th Edition):

Derouet, Marc. “Analysis of borehole heat exchanger in an existing ground-source heat pump installation.” 2014. Thesis, KTH. Accessed January 19, 2021. 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 (7^th Edition):

Derouet, Marc. “Analysis of borehole heat exchanger in an existing ground-source heat pump installation.” 2014. Web. 19 Jan 2021.

Vancouver:

Derouet M. Analysis of borehole heat exchanger in an existing ground-source heat pump installation. [Internet] [Thesis]. KTH; 2014. [cited 2021 Jan 19]. 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

University of Western Ontario

17. Drysdale, Ronan. Thermal Performance and Sustainability of Borehole Heat Exchangers within Building Clusters.

Degree: 2019, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/6102

► Geothermal energy has greatly increased in prevalence over the last 20 years. With many new installations, the desire to introduce geothermal energy into unused urban… (more)

Subjects/Keywords: Geothermal; building clusters; borehole heat exchanger; thermal transport; geo-exchange system; hydrogeology.; Other Earth Sciences

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Drysdale, R. (2019). Thermal Performance and Sustainability of Borehole Heat Exchangers within Building Clusters. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/6102

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Drysdale, Ronan. “Thermal Performance and Sustainability of Borehole Heat Exchangers within Building Clusters.” 2019. Thesis, University of Western Ontario. Accessed January 19, 2021. https://ir.lib.uwo.ca/etd/6102.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Drysdale, Ronan. “Thermal Performance and Sustainability of Borehole Heat Exchangers within Building Clusters.” 2019. Web. 19 Jan 2021.

Vancouver:

Drysdale R. Thermal Performance and Sustainability of Borehole Heat Exchangers within Building Clusters. [Internet] [Thesis]. University of Western Ontario; 2019. [cited 2021 Jan 19]. Available from: https://ir.lib.uwo.ca/etd/6102.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Drysdale R. Thermal Performance and Sustainability of Borehole Heat Exchangers within Building Clusters. [Thesis]. University of Western Ontario; 2019. Available from: https://ir.lib.uwo.ca/etd/6102

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Vytautas Magnus University

18. Tamošaitis, Donatas. Geoterminio šildymo ekonominis ir techninis įvertinimas.

Degree: Master, Physics, 2011, Vytautas Magnus University

URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110224_091359-85043 ;

►

Žemės šilumos siurblių sistemos surenka žemės šilumą, dažniausiai vertikaliu U formos gręžinio šilumokaičiu. U formos gręžinio šilumokaičio našumas priklauso nuo šiluminių žemės savybių, taip pat… (more)

▼

Žemės šilumos siurblių sistemos surenka žemės šilumą, dažniausiai vertikaliu U formos gręžinio šilumokaičiu. U formos gręžinio šilumokaičio našumas priklauso nuo šiluminių žemės savybių, taip pat nuo gręžinyje naudojamo skiedinio ar užpildo. Siekiant, kad Žemės šilumos siurblių sistemos pasiteisintų, projektuojant reikia atsižvelgti į geologinių struktūrų šiluminį laidumą ir gręžinio šilumokaičio šiluminę varžą. Šio darbo tikslas buvo nustatyti šilumos siurblio, naudojančio grunto šilumą, pritaikymo individualioje sodyboje siurblio techninis ir ekonominis įvertinimas. Nustatyta, kad investicijos projektui įgyvendinti, kai gyvenamajam pastatui šildyti ir buitiniam karštam vandeniui ruošti šildymo sezono metu šilumą gamina šilumos siurblys, naudojantis grunto šilumą, palyginti su tiesioginiu elektros naudojimu pastatui šildyti ir buitiniam karštam vandeniui ruošti, atsiperka per 6,3 metus. Šiluminės reakcijos testas padeda nustatyti šiluminį žemės laidumą (λ) gręžinio šilumokaičio įrengimo vietoje, bei efektyvią gręžinio šilumokaičio šiluminę varžą (Rb). Pagrindinis tikslas buvo suderinti gręžinio šilumokaitį su žemės sąlygomis, taip pat nustatyti gręžinio gylio poveikį (60 m: VB2; 90 m: VB3).

Ground source heat pump systems exchange heat with the ground, often through a vertical, U-tube, borehole heat exchanger. The performance of this U-tube borehole heat exchanger depends on the thermal properties of the ground formation, as well as grout or backfill in the borehole. The design and economic probability of ground source heat pump systems need the thermal conductivity of geological structure and thermal resistance of borehole heat exchanger. An economic and technical evaluation of the heat pump, which is using ground heat, in individual homestead. It was found that the investment for this project, when heat pump using ground heat is used to heat residential building and domestic hot water in heating season, compared with the use of direct electric heating of buildings and domestic hot water payback within 6.3 years. Thermal response test method allows the in-situ determination of the thermal conductivity (l) of the ground formation in the vicinity of a borehole heat exchanger, as well as the effective thermal resistance (Rb) of this latter. The main goal has been to determine same in-situ ground type of borehole heat exchanger, including the effect of borehole’s depths (60 m: VB2; 90 m: VB3).

Advisors/Committee Members: Pranevičius, Liudas (Master’s thesis supervisor), Kanapickas, Arvydas (Master’s thesis reviewer).

Subjects/Keywords: Gręžinio šilumokaitis; Žemės šilumos siurblys; Šiluminės reakcijos testas; Borehole heat exchanger; Ground source heat pump; Thermal response test

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tamošaitis, Donatas. (2011). Geoterminio šildymo ekonominis ir techninis įvertinimas. (Masters Thesis). Vytautas Magnus University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110224_091359-85043 ;

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

Tamošaitis, Donatas. “Geoterminio šildymo ekonominis ir techninis įvertinimas.” 2011. Masters Thesis, Vytautas Magnus University. Accessed January 19, 2021. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110224_091359-85043 ;.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

Tamošaitis, Donatas. “Geoterminio šildymo ekonominis ir techninis įvertinimas.” 2011. Web. 19 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

Tamošaitis, Donatas. Geoterminio šildymo ekonominis ir techninis įvertinimas. [Internet] [Masters thesis]. Vytautas Magnus University; 2011. [cited 2021 Jan 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110224_091359-85043 ;.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

Tamošaitis, Donatas. Geoterminio šildymo ekonominis ir techninis įvertinimas. [Masters Thesis]. Vytautas Magnus University; 2011. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110224_091359-85043 ;

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

KTH

19. Righi, Alexandro. Numerical models and simulations of geothermal heat exchangers.

Degree: Applied Thermodynamics and Refrigeration, 2013, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185816

Subjects/Keywords: ground source heat pump; borehole heat exchanger; numerical model

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Righi, A. (2013). Numerical models and simulations of geothermal heat exchangers. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185816

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Righi, Alexandro. “Numerical models and simulations of geothermal heat exchangers.” 2013. Thesis, KTH. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185816.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Righi, Alexandro. “Numerical models and simulations of geothermal heat exchangers.” 2013. Web. 19 Jan 2021.

Vancouver:

Righi A. Numerical models and simulations of geothermal heat exchangers. [Internet] [Thesis]. KTH; 2013. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185816.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Righi A. Numerical models and simulations of geothermal heat exchangers. [Thesis]. KTH; 2013. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185816

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

20. Kovářík, Tomáš. Tepelná čerpadla země - voda: Ground-source heat pump.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/30292

Master’s thesis deals with the theme in three parts theoretical, practical and experimental. Project deals with heating nursery school and experiment deals with capacity reduction borehole heating exchanger for ground – source heat pump. Advisors/Committee Members: Počinková, Marcela (advisor), Horák, Petr (referee).

Subjects/Keywords: Tepelné čerpadlo země – voda; vrt pro tepelná čerpadla; vytápění; větrání; mateřská škola; tepelný výměník.; Ground – source heat pump; borehole heating exchanger; heating systém; cooling systém; nursery school; heat exchanger.

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kovářík, T. (2019). Tepelná čerpadla země - voda: Ground-source heat pump. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/30292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kovářík, Tomáš. “Tepelná čerpadla země - voda: Ground-source heat pump.” 2019. Thesis, Brno University of Technology. Accessed January 19, 2021. http://hdl.handle.net/11012/30292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kovářík, Tomáš. “Tepelná čerpadla země - voda: Ground-source heat pump.” 2019. Web. 19 Jan 2021.

Vancouver:

Kovářík T. Tepelná čerpadla země - voda: Ground-source heat pump. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/11012/30292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kovářík T. Tepelná čerpadla země - voda: Ground-source heat pump. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/30292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

21. Ilisei, Gheorghe. Numerical analysis using simulations for a geothermal heat pump system. : Case study: modelling an energy efficient house.

Degree: Energy system, 2018, University of Gävle

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29101

►

The ground source resources are becoming more and more popular and now the ground source heat pumps are frequently used for heating and cooling… (more)

▼

The ground source resources are becoming more and more popular and now the ground source heat pumps are frequently used for heating and cooling different types of buildings. This thesis aims at giving a contribution in the development of the thermal modelling of borehole heat storage systems. Furthermore, its objective is to investigate the possibility of implementing of a GSHP (ground source heat pump) with vertical boreholes, in order to deliver the heating and cooling demand for a passive house and to emphasize some certain advantages of this equipment even in the case of a small building (e.g. residential house). A case study is presented to a suitable modelling tool for the estimation of the thermal behaviour of these systems GSHP by combining the outcome from different modelling programs. In order to do that, a very efficient residential solar house (EFden House – a passive residential single-family house, which was projected and built in Bucharest with academic purposes) is being analysed. The numerical results are produced using the software DesignBuilder, EED (Earth Energy Designer) and a sizing method for the length of the boreholes (ASHRAE method). The idea of using 2 different modelling programs and another sizing method for the borehole heat exchanger design (ASHRAE method) is to make sure that all the calculations and results are valid and reliable when analysing such a system theoretically (in the first phases of implementing a project), before performing a geotechnical study or a thermal response test in order to assess the feasibility of such a project beforehand. The results highlight that the length of the borehole, which is the main design parameter and also a good index in estimating the cost of the system, is directly influenced by the other fundamental variables like thermal conductivity of the grout, of the soil and the heat carrier fluid. Also, some correlations between these parameters and the COP (coefficient of performance) of the system were made. The idea of sizing the length of boreholes using two different methods shows the reliability of the modelling tool. The results showed a difference of only 2.5%. Moreover, the length of borehole is very important as it was calculated that can trigger a difference in electricity consumption of the GSHP up to 28%. It also showed the fact that the design of the whole system can be done beforehand just using modelling tools, without performing tests in-situ. The method aims at being considered as an efficient tool to estimate the length of the borehole of a GSHP system using several modelling tools.

The presentation was made via Skype due to the programme being online based

Subjects/Keywords: Low enthalpy Geothermal Energy; Borehole Heat Exchanger; Ground Source Heat pump; Ground water; Design Builder; EED (Earth Energy Designer); Energy Systems; Energisystem

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ilisei, G. (2018). Numerical analysis using simulations for a geothermal heat pump system. : Case study: modelling an energy efficient house. (Thesis). University of Gävle. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29101

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ilisei, Gheorghe. “Numerical analysis using simulations for a geothermal heat pump system. : Case study: modelling an energy efficient house.” 2018. Thesis, University of Gävle. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29101.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ilisei, Gheorghe. “Numerical analysis using simulations for a geothermal heat pump system. : Case study: modelling an energy efficient house.” 2018. Web. 19 Jan 2021.

Vancouver:

Ilisei G. Numerical analysis using simulations for a geothermal heat pump system. : Case study: modelling an energy efficient house. [Internet] [Thesis]. University of Gävle; 2018. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29101.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ilisei G. Numerical analysis using simulations for a geothermal heat pump system. : Case study: modelling an energy efficient house. [Thesis]. University of Gävle; 2018. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29101

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Johannes Gutenberg Universität Mainz

22. Malm, Florian. Bestimmung thermischer Untergrundparameter in Erdwärmesondenfeldern und Evaluierung tiefenaufgelöster Thermal-Response-Tests durch thermohydraulische Modellierungen.

Degree: 2013, Johannes Gutenberg Universität Mainz

URL: http://ubm.opus.hbz-nrw.de/volltexte/2013/3477/

►

Die oberflächennahe Geothermie leistet im Bereich der Nutzung regenerativer Wärme einen wichtigen Beitrag zum Klima- und Umweltschutz. Um die technische Nutzung oberflächennaher Geothermie zu optimieren,… (more)

▼

Die oberflächennahe Geothermie leistet im Bereich der Nutzung regenerativer Wärme einen wichtigen Beitrag zum Klima- und Umweltschutz. Um die technische Nutzung oberflächennaher Geothermie zu optimieren, ist die Kenntnis der Beschaffenheit des geologischen Untergrundes ausschlaggebend. Die vorliegende Dissertation befasst sich mit der Bestimmung verschiedener Untergrundparameter an einem Erdwärmesondenfeld. Es wurden Untersuchungen zur Bestimmung der Wärmeleitfähigkeit wie der enhanced Thermal Response Test (eTRT), sowie eine Untergrund-Temperaturüberwachung im ersten Betriebsjahr durchgeführt. Die Überwachung zeigte keine gegenseitige Beeinflussung einzelner Sonden. Ein Vergleich zwischen dem geplanten und dem tatsächlichem Wärmebedarf des ersten Betriebsjahres ergab eine Abweichung von ca. 35%. Dies zeigt, dass die Nutzungsparameter der Anlage deren Effizienz maßgeblich beeinflussen können. Der am Beispielobjekt praktisch durchgeführte eTRT wurde mittels numerischer Modellierung auf seine Reproduzierbarkeit hin überprüft. Bei einem rein konduktiven Wärmetransport im Untergrund betrug die maximale Abweichung der Messung selbst unter ungünstigen Bedingungen lediglich ca. 6% vom zu erwartenden Wert. Die Detektion von grundwasserdurchflossenen Schichten ist in den Modellen ebenfalls gut abbildbar. Problematisch bleibt die hohe Abhängigkeit des Tests von einer konstanten Wärmezufuhr. Lediglich die Bestimmung der Wärmeleitfähigkeit über das Relaxationsverhalten des Untergrundes liefert bei Wärmeeintragsschwankungen hinreichend genaue Ergebnisse. Die mathematische Nachbearbeitung von fehlerhaften Temperaturkurven bietet einen Einstiegspunkt für weiterführende Forschung.

Shallow geothermal energy plays a major role in the field of regenerative energy utilization. To optimize the technical utilization of shallow geothermics, knowledge of the local geology is crucial. This dissertation deals with the determination of underground parameters at a borehole heat exchanger field. Investigations like an enhanced Thermal Response Test (eTRT) or a temperature monitoring of the first operating year have been carried out. The monitoring showed no mutual influence between single BHEs. A comparison between the results of planned and real heat demand in this period showed a deviation of about 35%. This demonstrates that the utilization parameters have a crucial effect on the efficiency. Numerical modeling has been used to test the reproducibility of the eTRT. Even under unfavorable conditions the maximum deviation of the thermal conductivity from the expected value did not exceed 6%. It was also shown that the method is capable of detecting layers with groundwater flow. The models have shown that a stable heat supply during the test is crucial. Only the evaluation of the thermal conductivity with the thermal relaxation behavior provides suitable results with a fluctuating heat supply. The post-processing of flawed temperature data presents an entry point for further research.

Subjects/Keywords: Oberflächennahe Geothermie, Wärmeleitfähigkeit, Thermal Response Test, Erdwärmesonde, Hydrogeologie; shallow geothermal energy, thermal conductivity, thermal response test, borehole heat exchanger, hydrogeology; Earth sciences

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Malm, F. (2013). Bestimmung thermischer Untergrundparameter in Erdwärmesondenfeldern und Evaluierung tiefenaufgelöster Thermal-Response-Tests durch thermohydraulische Modellierungen. (Doctoral Dissertation). Johannes Gutenberg Universität Mainz. Retrieved from http://ubm.opus.hbz-nrw.de/volltexte/2013/3477/

Chicago Manual of Style (16^th Edition):

Malm, Florian. “Bestimmung thermischer Untergrundparameter in Erdwärmesondenfeldern und Evaluierung tiefenaufgelöster Thermal-Response-Tests durch thermohydraulische Modellierungen.” 2013. Doctoral Dissertation, Johannes Gutenberg Universität Mainz. Accessed January 19, 2021. http://ubm.opus.hbz-nrw.de/volltexte/2013/3477/.

MLA Handbook (7^th Edition):

Malm, Florian. “Bestimmung thermischer Untergrundparameter in Erdwärmesondenfeldern und Evaluierung tiefenaufgelöster Thermal-Response-Tests durch thermohydraulische Modellierungen.” 2013. Web. 19 Jan 2021.

Vancouver:

Malm F. Bestimmung thermischer Untergrundparameter in Erdwärmesondenfeldern und Evaluierung tiefenaufgelöster Thermal-Response-Tests durch thermohydraulische Modellierungen. [Internet] [Doctoral dissertation]. Johannes Gutenberg Universität Mainz; 2013. [cited 2021 Jan 19]. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2013/3477/.

Council of Science Editors:

Malm F. Bestimmung thermischer Untergrundparameter in Erdwärmesondenfeldern und Evaluierung tiefenaufgelöster Thermal-Response-Tests durch thermohydraulische Modellierungen. [Doctoral Dissertation]. Johannes Gutenberg Universität Mainz; 2013. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2013/3477/

23. Burlin, Jesper. Geoenergi med och utan värmepump.

Degree: Applied Physics and Electronics, 2017, Umeå University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-135751

► Detta examensarbete utfördes på uppdrag av Umeå Kommun. Uppgiften bestod av att utvärdera dagens användning av en borrhålsbrunn samt undersöka vad som är det… (more)

▼ Detta examensarbete utfördes på uppdrag av Umeå Kommun. Uppgiften bestod av att utvärdera dagens användning av en borrhålsbrunn samt undersöka vad som är det optimala användningsområdet för borrhålsbrunnen. Borrhålsbrunnen används i dagsläget för att förvärma samt kyla utomhusluft in till kontorsbyggnaden Kubens ventilationsaggregat. Ventilationens förvärmning består av två delar, en markkanal och ett geoenergibatteri. Viktiga parametrar hos förvärmningen analyserades med hjälp av mätvärden för temperatur och flöde. Resultaten jämfördes därefter med alternativet att använda borrhålsbrunnen tillsammans med en värmepump. Då borrhålsbrunnens kapacitet inte var tillräcklig för att klara byggnadens hela uppvärmningsbehov, undersöktes det hur en värmepump skulle kunna köras i kombination med fjärrvärme. Två driftstrategier, Bas och Kapatoppar, undersöktes. Bas leverar en basproduktion under hela vinterperioden medan Kapatoppar startar vid -6°C för att sänka effekttoppar. Utvärderingen av förvärmningen visade att geoenergibatteriet är mer kompatibelt med ventilationsaggregat av VAV-typ (Variable Air Volume) än vad markkanalen är. Däremot är inte förvärmning i kombination med roterande värmeväxlare ett bra koncept för byggnaden som den används idag. På grund av att förvärmningen är placerad före den roterande värmeväxlaren så är bara 15-20 % av förvärmningseffekterna energibesparande. Detta kombinerat med en optimerad drift av aggregatet sett till tidsstyrning och behovsstyrning av flöde gör att förvärmningen har en liten påverkan både på byggnadens maximala effektbehov och totala energibehov. Att köra värmepump i kombination med fjärrvärme för uppvärmning var ekonomiskt lönsamt främst på grund av att värmepumpen kunde kapa byggnadens effektoppar. Kostnaden för storleken på den abonnerade effekten uppgår idag till drygt 40 % av den totala fjärrvärmekostnaden. Dagens relation mellan el- och fjärrvärmepriser bidrog naturligtvis också till att värmepumpsalternativet var lönsamt. För de undersökta förutsättningarna så blev paybacktiden för en värmepump med den lönsammaste driftstrategin, Bas, 4,4 år.

Subjects/Keywords: geoenergi; borehole heat exchanger; ventilation; Energy Systems; Energisystem

…Borehole Heat Exchanger)[6]. En experimentell 3 Geoenergi med och utan… …att förvärmas av den. Denna teknik kallas EAHE (Earth-to-air Heat Exchanger) och… …kollektorslinga av detta slag ansluts oftast till värmepumpar och benämns inom branschen som BHE (… …värmepump studie har visat att BHE presterar bättre än EAHE till följd av de mer fördelaktiga… …värmeöverföringsförutsättningarna [12]. då Detta BHE utförs med för BHE-kongurationer luft…

11 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Burlin, J. (2017). Geoenergi med och utan värmepump. (Thesis). Umeå University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-135751

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Burlin, Jesper. “Geoenergi med och utan värmepump.” 2017. Thesis, Umeå University. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-135751.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Burlin, Jesper. “Geoenergi med och utan värmepump.” 2017. Web. 19 Jan 2021.

Vancouver:

Burlin J. Geoenergi med och utan värmepump. [Internet] [Thesis]. Umeå University; 2017. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-135751.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Burlin J. Geoenergi med och utan värmepump. [Thesis]. Umeå University; 2017. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-135751

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. Sheik ismail L. Studies on pressure drop and heat Transfer characteristics of compact Plate fin heat exchangers;.

Degree: Studies on pressure drop and heat Transfer characteristics of compact Plate fin heat exchangers, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/30467

►

A plate fin heat exchanger is a form of compact heat exchanger newlineconsisting of a block of alternating layers of corrugated fins and flat newlineseparators… (more)

Subjects/Keywords: Compact heat exchanger

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

L, S. i. (2014). Studies on pressure drop and heat Transfer characteristics of compact Plate fin heat exchangers;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/30467

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

L, Sheik ismail. “Studies on pressure drop and heat Transfer characteristics of compact Plate fin heat exchangers;.” 2014. Thesis, Anna University. Accessed January 19, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/30467.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

L, Sheik ismail. “Studies on pressure drop and heat Transfer characteristics of compact Plate fin heat exchangers;.” 2014. Web. 19 Jan 2021.

Vancouver:

L Si. Studies on pressure drop and heat Transfer characteristics of compact Plate fin heat exchangers;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Jan 19]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/30467.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

L Si. Studies on pressure drop and heat Transfer characteristics of compact Plate fin heat exchangers;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/30467

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tennessee – Knoxville

25. Talley, Derrick Alan. Performance Degradation Due to Micro Fouling Layers in Large-Scale Industrial Heat Exchangers.

Degree: MS, Mechanical Engineering, 2019, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_gradthes/5533

► The 16T Propulsion Wind Tunnel, located at Arnold Engineering Development Complex (AEDC), Arnold Air Force Base, Tennessee, is a closed-circuit wind tunnel consisting of a… (more)

Subjects/Keywords: Heat Exchanger; Fouling

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Talley, D. A. (2019). Performance Degradation Due to Micro Fouling Layers in Large-Scale Industrial Heat Exchangers. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/5533

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Talley, Derrick Alan. “Performance Degradation Due to Micro Fouling Layers in Large-Scale Industrial Heat Exchangers.” 2019. Thesis, University of Tennessee – Knoxville. Accessed January 19, 2021. https://trace.tennessee.edu/utk_gradthes/5533.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Talley, Derrick Alan. “Performance Degradation Due to Micro Fouling Layers in Large-Scale Industrial Heat Exchangers.” 2019. Web. 19 Jan 2021.

Vancouver:

Talley DA. Performance Degradation Due to Micro Fouling Layers in Large-Scale Industrial Heat Exchangers. [Internet] [Thesis]. University of Tennessee – Knoxville; 2019. [cited 2021 Jan 19]. Available from: https://trace.tennessee.edu/utk_gradthes/5533.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Talley DA. Performance Degradation Due to Micro Fouling Layers in Large-Scale Industrial Heat Exchangers. [Thesis]. University of Tennessee – Knoxville; 2019. Available from: https://trace.tennessee.edu/utk_gradthes/5533

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Western Ontario

26. Dehkordi, S. Emad. Hydrogeological and Thermal Sustainability of Geothermal Borehole Heat Exchangers.

Degree: 2013, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/1722

► Assessment of the current approach taken by guidelines and design methods of vertical closed loop heat exchangers shows that often groundwater flow is either disregarded… (more)

▼ Assessment of the current approach taken by guidelines and design methods of vertical closed loop heat exchangers shows that often groundwater flow is either disregarded or is not methodically incorporated. The state of scientific research in this arena reveals that overlooking the groundwater flow in the design procedure may not always be a correct assumption. The significance of advective heat transport compared to conduction is defined by the groundwater flux or Darcy velocity which heavily depends on the hydraulic conductivity of the ground, followed by the hydraulic gradient which has a relatively limited range. A sensitivity analysis on ground and borehole properties ranks groundwater flux together with the thermal conductivity of the ground and the temperature gradient between the antifreeze and the ground (i.e. inlet and background temperatures) as the key factors defining the heat exchange efficiency. The study confirms that the effect of groundwater advection on an operational borehole heat exchanger (BHE) becomes notable at fluxes ≥10-7 m/s; fluxes ≥10-8 m/s accelerate the returning of ground temperatures to the initial background temperature (i.e. thermal recovery) when the BHE is not operational. Examining the groundwater flow impact on multiple BHEs shows that as increasing the number of boreholes causes larger temperature disturbances, the effect of advective transport becomes more substantial. The thermal interference between BHEs induced by groundwater flow in line arrays can be of higher relevance than square arrays, depending on the flow direction. Although the BHE spacing is a major design parameter, in the long-term groundwater flow may be more critical to improving the thermal performance of the system as it considerably shortens the time to reach steady state. The effect of hydrogeological inhomogeneities, i.e. fractures, depends on their dip angle. Modeling of vertical features up to 10 m away from a BHE with aperture ≥1 mm, which can be recognized through geological investigation techniques but not thermal response testing (TRT), shows long-term impacts. Depending on the openness and distance from the borehole, one major fracture has the most influence on the BHE. For horizontal features, fracture frequency is the key parameter to consider.

Subjects/Keywords: Borehole heat exchanger; Borehole thermal energy storage; Geothermal heat pump; Groundwater flow; Heat transport; Vertical closed loop; Civil Engineering; Energy Systems; Environmental Engineering; Geology; Geophysics and Seismology; Geotechnical Engineering; Heat Transfer, Combustion; Hydrology; Natural Resources Management and Policy; Oil, Gas, and Energy; Other Civil and Environmental Engineering; Other Earth Sciences; Other Environmental Sciences; Sustainability; Water Resource Management

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dehkordi, S. E. (2013). Hydrogeological and Thermal Sustainability of Geothermal Borehole Heat Exchangers. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/1722

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dehkordi, S Emad. “Hydrogeological and Thermal Sustainability of Geothermal Borehole Heat Exchangers.” 2013. Thesis, University of Western Ontario. Accessed January 19, 2021. https://ir.lib.uwo.ca/etd/1722.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dehkordi, S Emad. “Hydrogeological and Thermal Sustainability of Geothermal Borehole Heat Exchangers.” 2013. Web. 19 Jan 2021.

Vancouver:

Dehkordi SE. Hydrogeological and Thermal Sustainability of Geothermal Borehole Heat Exchangers. [Internet] [Thesis]. University of Western Ontario; 2013. [cited 2021 Jan 19]. Available from: https://ir.lib.uwo.ca/etd/1722.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dehkordi SE. Hydrogeological and Thermal Sustainability of Geothermal Borehole Heat Exchangers. [Thesis]. University of Western Ontario; 2013. Available from: https://ir.lib.uwo.ca/etd/1722

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

27. Lippy, Matthew Stephen. Development of a Minichannel Compact Primary Heat Exchanger for a Molten Salt Reactor.

Degree: MS, Mechanical Engineering, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/32603

► The first Molten Salt Reactor (MSR) was designed and tested at Oak Ridge National Laboratory (ORNL) in the 1960â s, but recent technological advancements now… (more)

Subjects/Keywords: nuclear; molten salt reactor; primary heat exchanger; compact heat exchanger; heat exchanger

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lippy, M. S. (2011). Development of a Minichannel Compact Primary Heat Exchanger for a Molten Salt Reactor. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32603

Chicago Manual of Style (16^th Edition):

Lippy, Matthew Stephen. “Development of a Minichannel Compact Primary Heat Exchanger for a Molten Salt Reactor.” 2011. Masters Thesis, Virginia Tech. Accessed January 19, 2021. http://hdl.handle.net/10919/32603.

MLA Handbook (7^th Edition):

Lippy, Matthew Stephen. “Development of a Minichannel Compact Primary Heat Exchanger for a Molten Salt Reactor.” 2011. Web. 19 Jan 2021.

Vancouver:

Lippy MS. Development of a Minichannel Compact Primary Heat Exchanger for a Molten Salt Reactor. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10919/32603.

Council of Science Editors:

Lippy MS. Development of a Minichannel Compact Primary Heat Exchanger for a Molten Salt Reactor. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/32603

KTH

28. Casellato, Francesco. Heat exchange phenomena and COP evaluation in heat pump systems coupled to single borehole heat exchangers.

Degree: Applied Thermodynamics and Refrigeration, 2013, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137234

► In recent years a growing interest in Borehole Heat Exchangers (BHEs) has been shown in Europe thanks to the increase of installations in systems… (more)

Subjects/Keywords: borehole; COP; convection; geothermal; heat pump

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Casellato, F. (2013). Heat exchange phenomena and COP evaluation in heat pump systems coupled to single borehole heat exchangers. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137234

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Casellato, Francesco. “Heat exchange phenomena and COP evaluation in heat pump systems coupled to single borehole heat exchangers.” 2013. Thesis, KTH. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137234.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Casellato, Francesco. “Heat exchange phenomena and COP evaluation in heat pump systems coupled to single borehole heat exchangers.” 2013. Web. 19 Jan 2021.

Vancouver:

Casellato F. Heat exchange phenomena and COP evaluation in heat pump systems coupled to single borehole heat exchangers. [Internet] [Thesis]. KTH; 2013. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137234.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Casellato F. Heat exchange phenomena and COP evaluation in heat pump systems coupled to single borehole heat exchangers. [Thesis]. KTH; 2013. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137234

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

29. Pešl, Metka. Odzivne funkcije in toplotni vpliv različnih konfiguracij vertikalnih toplotnih prenosnikov v vrtini v sistemih zemeljskih toplotnih črpalk.

Degree: 2016, Univerza v Mariboru

URL: https://dk.um.si/IzpisGradiva.php?id=57369 ; https://dk.um.si/Dokument.php?id=96821&dn= ; https://plus.si.cobiss.net/opac7/bib/19685654?lang=sl

►

V magistrskem delu je temeljni poudarek na treh različnih konfiguracijah vrtin za katere so prikazane grafične primerjave g-funkcij, ki so izračunane z analitičnim modelom končnega… (more)

▼

V magistrskem delu je temeljni poudarek na treh različnih konfiguracijah vrtin za katere so prikazane grafične primerjave g-funkcij, ki so izračunane z analitičnim modelom končnega črtnega vira in določene z numeričnim modelom Eskilsona. Rezultati kažejo, da analitična rešitev sledi zelo dobro numeričnim rezultatom. Predstavljena je tudi študija, kako se temperatura zemlje s časom spreminja v primeru različnih konfiguracij vrtin, če toploto odvajamo iz zemlje (ogrevanje) in če toploto dovajamo v zemljo (hlajenje). Rezultati kažejo, da je sprememba temperaturnega polja odvisna od razdalje med vrtinami. Toplotni vpliv med vrtinami je skoraj neopazen v začetku delovanja sistema s toplotno črpalko, vendar pa s časom postaja vse večji, dokler se ne doseže stacionarno stanje. Toplotni vpliv med vrtinami pada z naraščajočo razdaljo med njimi in je zanemarljiv, če je razdalja med vrtinami večja od dolžine vrtine. Na koncu magistrskega dela je za primer enodružinske hiše izvedeno dimenzioniranje toplotne črpalke, ki omogoča ogrevanje, hlajene in pripravo tople sanitarne vode. Vir toplote je zemlja z vertikalnima toplotnima prenosnikoma v vrtini. Vračilna doba naložbe je 13,7 leta.

In master thesis the primary focus is on three various multiple borehole configurations for which a graphical comparison of g-functions, calculated after an analytical model of final line source and obtained with numerical model derived from the work of Eskilson, are shown. The results show that the analytical solution follows the numerical results very well. A case study is also presented to show how the ground temperature changes with time for various multiple borehole configurations for heat extraction (heating) and heat injection (cooling). The results show that the change of temperature field is dependent on spacing between boreholes. Thermal influence between boreholes is almost imperceptible in the start of operation, but it becomes higher with time until the stationary state is not achieved. Thermal influence between boreholes decreases with increasing the spacing between boreholes and become negligible, if the spacing is larger than length of borehole. In the end of master thesis dimensioning of heat pump for heating, cooling and preparation of domestic hot water for single-family detached house is presented. The heat source is ground with vertical heat exchangers in borehole. Investment return period is 13,7 years.

Advisors/Committee Members: Goričanec, Darko.

Subjects/Keywords: geotermalna energija; toplotna črpalka zemlja/voda; vertikalni toplotni prenosnik v vrtini; temperaturno polje; brezdimenzijske temperaturne odzivne g-funkcije; geothermal energy; ground-water heat pump; vertical borehole heat exchanger; temperature field; non-dimensional temperature response g-function; info:eu-repo/classification/udc/621.577.2+697.1(043)

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pešl, M. (2016). Odzivne funkcije in toplotni vpliv različnih konfiguracij vertikalnih toplotnih prenosnikov v vrtini v sistemih zemeljskih toplotnih črpalk. (Masters Thesis). Univerza v Mariboru. Retrieved from https://dk.um.si/IzpisGradiva.php?id=57369 ; https://dk.um.si/Dokument.php?id=96821&dn= ; https://plus.si.cobiss.net/opac7/bib/19685654?lang=sl

Chicago Manual of Style (16^th Edition):

Pešl, Metka. “Odzivne funkcije in toplotni vpliv različnih konfiguracij vertikalnih toplotnih prenosnikov v vrtini v sistemih zemeljskih toplotnih črpalk.” 2016. Masters Thesis, Univerza v Mariboru. Accessed January 19, 2021. https://dk.um.si/IzpisGradiva.php?id=57369 ; https://dk.um.si/Dokument.php?id=96821&dn= ; https://plus.si.cobiss.net/opac7/bib/19685654?lang=sl.

MLA Handbook (7^th Edition):

Pešl, Metka. “Odzivne funkcije in toplotni vpliv različnih konfiguracij vertikalnih toplotnih prenosnikov v vrtini v sistemih zemeljskih toplotnih črpalk.” 2016. Web. 19 Jan 2021.

Vancouver:

Pešl M. Odzivne funkcije in toplotni vpliv različnih konfiguracij vertikalnih toplotnih prenosnikov v vrtini v sistemih zemeljskih toplotnih črpalk. [Internet] [Masters thesis]. Univerza v Mariboru; 2016. [cited 2021 Jan 19]. Available from: https://dk.um.si/IzpisGradiva.php?id=57369 ; https://dk.um.si/Dokument.php?id=96821&dn= ; https://plus.si.cobiss.net/opac7/bib/19685654?lang=sl.

Council of Science Editors:

Pešl M. Odzivne funkcije in toplotni vpliv različnih konfiguracij vertikalnih toplotnih prenosnikov v vrtini v sistemih zemeljskih toplotnih črpalk. [Masters Thesis]. Univerza v Mariboru; 2016. Available from: https://dk.um.si/IzpisGradiva.php?id=57369 ; https://dk.um.si/Dokument.php?id=96821&dn= ; https://plus.si.cobiss.net/opac7/bib/19685654?lang=sl

30. Simondon, Camille. Optimization of thermal response test equipment and evaluation tools.

Degree: Applied Thermodynamics and Refrigeration, 2014, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147764

► Nowadays Ground Source Heat Pumps (GSHP) are widely used to provide heating and/or cooling as well as domestic hot water in commercial and residential… (more)

Subjects/Keywords: Borehole Heat Exchanger; Ground Source Heat Pump; Distributed Thermal Response Test; Python; Evaluation Tool

…called borehole heat exchanger. The U-pipe configuration is the most common BHE used in many… …2 Figure 5: Thermal resistance fundamental in borehole heat exchanger… …circulating in the borehole heat exchanger, i.e. the ground side. Nowadays, ground-source heat pumps… …5. Figure 5: Thermal resistance fundamental in borehole heat exchanger 3 It can also… …borehole heat exchanger is represented as a cylinder filled with a backfill material and the…

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Simondon, C. (2014). Optimization of thermal response test equipment and evaluation tools. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147764

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Simondon, Camille. “Optimization of thermal response test equipment and evaluation tools.” 2014. Thesis, KTH. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147764.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Simondon, Camille. “Optimization of thermal response test equipment and evaluation tools.” 2014. Web. 19 Jan 2021.

Vancouver:

Simondon C. Optimization of thermal response test equipment and evaluation tools. [Internet] [Thesis]. KTH; 2014. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147764.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Simondon C. Optimization of thermal response test equipment and evaluation tools. [Thesis]. KTH; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147764

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations