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Modeling and Heat Management in Polymer Electrolyte Membrane Fuel Cell Using Heat pipes for CHP Applications

Tahmasbi, Amir Abbas | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44436 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Roshandel, Ramin; Shafii, Mohammad Behshad
  7. Abstract:
  8. Fuel cell-based CHP systems for distributed residential power generation represent an interesting alternative to traditional thermoelectric plants. This is mainly due to the high efficiency obtainable in the production of electricity and heat in a decentralized, quiet and environmental friendly way. The current thesis focuses on the development, in Matlab_Simulink environment, of a complete dynamic model of a residential cogenerative (CHP) energy system consisting of the Proton Exchange Membrane fuel cell (PEMFC), in two scenarios. The first scenario emphasizes on use of fan and usual Heat Exchanger for cooling of Proton membrane fuel cell and conveying generated heat in PEM fuel cell to consumed water by residential users. The second scenario consist of using a thermosyphon Heat Pipe for both cooling and providing adequate heat for production of hot water in order to satisfy hot water consumption by residential users. The target of the study is the investigation through such a model of the behavior of CHP systems based on fuel cell (FC) at variable electrical and thermal load, in reference to typical load curves of residential users. With the aim to evaluate the system performance (efficiency, fuel consumption, hot water production, response time) and then to characterize its better operating conditions with particular attention to implement heat pipe instead of usual Heat Exchangers, suitable simulations were carried out. They are characterized by the following of a typical electrical load trend and in relation to two different thermal load profiles. The dynamic model presented in this paper has allowed observing the fully functioning of the FC based system under variable loads and it has permitted to present appropriate design for this system. Our results show that by means of Heat Pipe and eliminating fan from PEMFC, electrical efficiency of PEMFC will increase from 46.4 to 51 percent. Furthermore thermal efficiency and total efficiency of CHP system will increase from 40 to 44 and 86.4 to 95 percent. In addition with this new strategy, temperature of the PEMFC retains in appropriate operational condition range and consumption of Hydrogen and Natural gas as a feed entry to CHP system will decreases
  9. Keywords:
  10. Proton Exchange Membrane (PEM)Fuel Cell ; Modeling ; Heat Management ; Combined Heat and Power Generation ; Heat Pipe

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