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You searched for subject:(combined power source). Showing records 1 – 3 of 3 total matches.

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University of Bath

1. Cooper, Samuel J. G. Thermodynamic analysis of air source heat pumps and micro combined heat and power units participating in a distributed energy future.

Degree: PhD, 2013, University of Bath

Achieving the reductions in carbon dioxide emissions which are necessary will require improvements in the way in which domestic space heating is supplied. Air Source Heat Pumps and micro-Combined Heat and Power units both have the potential to reduce emissions while using primary energy resources more efficiently. The performance which these technologies can achieve is fundamental to fulfilling this potential and yet it is still subject to some uncertainty. This thesis analyses the performance of Air Source Heat Pumps and micro-Combined Heat and Power units in terms of their energy and exergy requirements and in terms of the carbon dioxide emissions associated with their operation. A review of the literature identified that it was appropriate to develop a novel modelling approach. Models of many components currently exist and these are adopted and extended wherever possible within this modelling approach. However, it is the unique way in which this research combines these models and adds additional components which delivers performance data relating to a wider range of conditions at a greater level of detail than that which was previously available. The model which was developed can dynamically simulate the heating and power demands in many dwellings simultaneously, facilitating meaningful study of effects which are dependent upon the sum of their power flows. Consideration of the effect of operating conditions includes permutations of climate, control systems (including those which engage with demand side management), grid generation mixes and building properties. Efficient Air Source Heat Pumps units have the potential to make energy and carbon emissions savings at present but their performance is sensitive to the conditions studied. In particular, appropriate control of the units can yield energy savings of around 25%. Additionally, the carbon emissions intensity of the grid is an important consideration which is explored in depth. Currently, energy requirements and carbon emissions can be reduced by the use of micro-Combined Heat and Power units. Their potential to further reduce carbon emissions diminishes if the grid is predominantly decarbonised but units with high electrical efficiencies can still save energy. The effect of the control approach which is adopted is also significant and has different effects on fuel-cell based units compared to combustion-based units. The key contribution of this work is the analysis of performance data for a selection of units operating under a range of conditions, calculated with a consistent, accurate methodology. Comparison is made between the technologies and between the effects of different operating conditions. A second significant contribution of this work is the development of the model which was used to generate the performance results. These advances allow more detailed comparative analysis of performance data in a wider range of conditions than previously possible.

Subjects/Keywords: 621.4025; air source heat pumps; micro combined heat and power; energy analysis; efficiency; carbon emissions

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APA (6th Edition):

Cooper, S. J. G. (2013). Thermodynamic analysis of air source heat pumps and micro combined heat and power units participating in a distributed energy future. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/thermodynamic-analysis-of-air-source-heat-pumps-and-micro-combined-heat-and-power-units-participating-in-a-distributed-energy-future(09bf15f0-813d-4d61-af7a-39940f3f876f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577742

Chicago Manual of Style (16th Edition):

Cooper, Samuel J G. “Thermodynamic analysis of air source heat pumps and micro combined heat and power units participating in a distributed energy future.” 2013. Doctoral Dissertation, University of Bath. Accessed October 17, 2019. https://researchportal.bath.ac.uk/en/studentthesis/thermodynamic-analysis-of-air-source-heat-pumps-and-micro-combined-heat-and-power-units-participating-in-a-distributed-energy-future(09bf15f0-813d-4d61-af7a-39940f3f876f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577742.

MLA Handbook (7th Edition):

Cooper, Samuel J G. “Thermodynamic analysis of air source heat pumps and micro combined heat and power units participating in a distributed energy future.” 2013. Web. 17 Oct 2019.

Vancouver:

Cooper SJG. Thermodynamic analysis of air source heat pumps and micro combined heat and power units participating in a distributed energy future. [Internet] [Doctoral dissertation]. University of Bath; 2013. [cited 2019 Oct 17]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/thermodynamic-analysis-of-air-source-heat-pumps-and-micro-combined-heat-and-power-units-participating-in-a-distributed-energy-future(09bf15f0-813d-4d61-af7a-39940f3f876f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577742.

Council of Science Editors:

Cooper SJG. Thermodynamic analysis of air source heat pumps and micro combined heat and power units participating in a distributed energy future. [Doctoral Dissertation]. University of Bath; 2013. Available from: https://researchportal.bath.ac.uk/en/studentthesis/thermodynamic-analysis-of-air-source-heat-pumps-and-micro-combined-heat-and-power-units-participating-in-a-distributed-energy-future(09bf15f0-813d-4d61-af7a-39940f3f876f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577742

2. Niemoeller, Benjamin A. An approach to controlling an active parallel interface between a transient energy source and a dc voltage bus.

Degree: MS, 1200, 2011, University of Illinois – Urbana-Champaign

This thesis investigates controlling a dc-dc converter connecting a capacitor or ultracapacitor (UC) to a dc voltage bus by regulating the series impedance of the converter. Decoupling the capacitance from the voltage bus is shown to reduce the size and/or weight of the power source. The impedance of the dc-dc converter is shaped by a high-pass filter so that it is low at high frequencies, but infinite at dc. This shaped-impedance controller allows load current to be shared between the dc source and decoupled capacitor, even when the dc source is uncontrolled, as long as the dc source has nonzero source impedance. Charge transfer to and from the capacitor is limited to a finite value proportional to a step change in bus voltage. The same control approach was applied to the converter which added decoupled bus capacitance to an electric vehicle power source, where the dc source is a battery connected directly to the output voltage bus, and to a voltage regulator module (VRM) for a desktop computer processor. Design equations and small- and large-signal models are developed in detail for the vehicle power source. A second loop was added to the controller to help regulate UC charge level. Small-signal system stability is verified across the range of expected operating points. Experimental results of a scaled-down combined source verify theoretical predictions. For the VRM, a multiphase buck converter is augmented by a second set of phases which carry only fast current transients. Large-signal models and switch dissipation analyses predict that the proposed topology eliminates the need for bulk electrolytic capacitors on the voltage bus yet has efficiency comparable to a conventional multiphase VRM. Advisors/Committee Members: Krein, Philip T. (advisor).

Subjects/Keywords: Battery; ultracapacitor; hybrid; electric vehicle; Hybrid Electric Vehicle (HEV); Voltage Regulator Module (VRM); dc-dc converter; electric storage; power converter; combined source; combined electric source; combined power source; multiphase VRM; multiphase buck; reduce size of bulk capacitance; dynamic model of dc-dc converter

…showing the combined power source with its controller. Power-handling elements are in the… …This waveform draws full load power from the combined source for 10 21 seconds, followed… …1 1.1 Combined Battery and Ultracapacitor Source for a Vehicle .......................3… …voltage across source (and load) terminals will never change. Real dc power sources… …also allow the combined source to deliver more current to the load for a period of time. When… 

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

APA (6th Edition):

Niemoeller, B. A. (2011). An approach to controlling an active parallel interface between a transient energy source and a dc voltage bus. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/18296

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

Chicago Manual of Style (16th Edition):

Niemoeller, Benjamin A. “An approach to controlling an active parallel interface between a transient energy source and a dc voltage bus.” 2011. Thesis, University of Illinois – Urbana-Champaign. Accessed October 17, 2019. http://hdl.handle.net/2142/18296.

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

MLA Handbook (7th Edition):

Niemoeller, Benjamin A. “An approach to controlling an active parallel interface between a transient energy source and a dc voltage bus.” 2011. Web. 17 Oct 2019.

Vancouver:

Niemoeller BA. An approach to controlling an active parallel interface between a transient energy source and a dc voltage bus. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2011. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/2142/18296.

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

Council of Science Editors:

Niemoeller BA. An approach to controlling an active parallel interface between a transient energy source and a dc voltage bus. [Thesis]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/18296

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


Brno University of Technology

3. Sedlák, Martin. Modernizace výtopny na biomasu.

Degree: 2008, Brno University of Technology

Diplomová práce má za úkol posoudit vhodnost použití kogenerační výroby elektrické energie a tepla v Bystřici nad Pernštejnem, která zatím využívá pouze teplo z obecní výtopny na biomasu. Text je koncipován tak, aby popsal zákonitosti a potenciál obnovitelných zdrojů i možnosti využití kombinované výroby elektřiny a tepla jak v České republice tak v Evropském a světovém rámci aktuálních událostí. Z úvodních obecných kapitol vychází samotné řešení konkrétního příkladu využívání obnovitelných zdrojů v Bystřici nad Pernštejnem. Postupně jsou analyzovány současné instalované zařízení, potenciál biomasy jako základního palivového zdroje pro budoucí projekty a možnosti rozšíření stávajícího portfolia energetických zdrojů v obci. Na tomto základě jsou navrhnuty tři v úvahu přicházející varianty, pro něž je proveden základní návrh cyklu a vyhodnocení po ekonomické stránce a vysloveny závěry o vhodném dalším postupu města.; The thesis examines the suitability of a CHP project in Bystřice nad Pernštejnem, a small town in Vysočina region, Czech Republic, which is currently supplied by biomass central heating. It reviews situation and availability of renewable energy sources and opportunities for CHP both in the Czech Republic and in Europe, including the context of current global developments. The opening chapters are followed with the renewable energy project for Bystřice nad Pernštejnem itself. The current technology, availability of biomass fuel for a potential future project, and possible development of energy sources in the town are analysed. Three alternative solutions for the CHP plant are suggested, with proposal for the technology and economic analysis, and possible future steps of the town council are discussed. Advisors/Committee Members: Skála, Zdeněk (advisor).

Subjects/Keywords: biomasa; obnovitelné zdroje energie; kotel; kogenerace; organický Rankinův cyklus (ORC); energetická bezpečnost; decentralizace; biomass; renewable source energy; boiler; combined heat and power; organic Rankin cycles (ORC); energy security

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Sedlák, M. (2008). Modernizace výtopny na biomasu. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/71118

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

Chicago Manual of Style (16th Edition):

Sedlák, Martin. “Modernizace výtopny na biomasu. ” 2008. Thesis, Brno University of Technology. Accessed October 17, 2019. http://hdl.handle.net/11012/71118.

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

MLA Handbook (7th Edition):

Sedlák, Martin. “Modernizace výtopny na biomasu. ” 2008. Web. 17 Oct 2019.

Vancouver:

Sedlák M. Modernizace výtopny na biomasu. [Internet] [Thesis]. Brno University of Technology; 2008. [cited 2019 Oct 17]. Available from: http://hdl.handle.net/11012/71118.

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

Council of Science Editors:

Sedlák M. Modernizace výtopny na biomasu. [Thesis]. Brno University of Technology; 2008. Available from: http://hdl.handle.net/11012/71118

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

.