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The Effect Of Using Heat Pipes On Heat Management In Pem Fuel Cell- Metal Hydride System

Hosseini, Atiyeh | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44335 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Roshandel, Ramin; Shafii, Mohammad Behshad
  7. Abstract:
  8. On-board hydrogen storage systems (as a substitute for fossil fuels) employing high-pressure metal hydrides, promise advantages including high volumetric capacities and cold start capability. In this project, we discuss the development of a system simulation model in Matlab/Simulink platform. Transient equations for mass balance and energy balance are presented. During driving, the bed requires external heat source, which is planned to be supplied by rejected heat from proton-exchange membrane (PEM) fuel cell. Therefore, this study develops a system-level dynamic model of a PEM fuel cell that is capable of characterizing the mixed effects of temperature, gas flow and capacitance, with particular emphasis focused on system’s temperature transient behavior. The fuel cell system is divided into three control volumes and thus a lumped-parameter model for these sub-systems is established using a combination of intrinsic mechanistic relations and empirical modeling. The dynamic model is simulated using Matlab/Simulink. A thermosyphon is used to passively transfer PEMFC’s heat to the metal hydride tank. The thermosyphon maintains the temperature of the PEM fuel cell in a specific range and carries the remaining thermal energy to the hydrogen tank. An energy-based model of the thermosyphon with a thermal resistance network was developed to determine overall performance. Finally, drive cycle simulations for a fuel cell vehicle are performed and detailed results are presented. The results show that by transferring excess fuel cell heat to the metal hydride tank, metal hydride tank’s operational parameters will increase substantially comparing to the independent system. In addition, fuel cell thermal efficiency is increased by about %40 due to using its excess heat by implementing heat pipes, which help us become closer to economic efficient FCVs
  9. Keywords:
  10. Proton Exchange Membrane (PEM)Fuel Cell ; Heat Pipe ; Metal Hydrid Tank ; Heat Management ; Heat Integration

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