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Modeling and Analysis of Optimal Control and Condition Monitoring of Fuel Cell System Based on Performance History

Parhizgar, Tarannom | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43694 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Roshandel, Ramin
  7. Abstract:
  8. The short life of Polymer Electrolyte Membrane (PEM) fuel cells is one of the critical criteria to their commercialization. A longer operation life time should be achieved to reach high reliability, low $/kWh cost and to use fuel cells as economical alternative energy systems.Therefore,diagnosing degradation mechanisms and the causes of power loss in fuel cell life time is of great importance. Operating conditions affect output power density and performance degradation. To achieve maximum power generation through fuel cell life time, a model is needed which is able to estimate power density and performance degradation simultaneously regarding to operating conditions. In present work, a single PEM fuel cell is investigated. Membrane and catalyst layers (anode and cathode electrodes) are considered as critical components that affect the degradation of the cell.The model used in this work diagnoses degradation of MEA (platinum degradation in catalyst layers and membrane thinning and dehydration in polymer membrane), and by considering the degradation over operating time, estimates power density over system lifetime. In this thesis, also three optimization model with different objective functions are developed to maximize total energy production. The results show that by continuously optimizing the operating conditions, total energy generation of the system will increase up to 3.16%.

  9. Keywords:
  10. Proton Exchange Membrane (PEM)Fuel Cell ; Modeling ; Operating Condition ; Optimization ; Component Degradation

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