| 초록 |
Proton Exchange Membrane (PEM) fuel cells are promising future power source, due to their high power density, simple and safe construction, even at low temperatures. However, physical phenomena of PEM fuel cell, especially at the electrode, are not well-known, yet. And PEM fuel cell has many parameters which have an influence on a cell performance and are unmanageable mathematically. Mathematical models are so useful tools for understanding PEM fuel cell in a view of physical and electrochemical phenomena, and for optimizing various operating parameters (e.g. cell temperature, humidity of inlet gases, etc.) to improve its performance and efficiency. In this study, dynamic model was adopted for a mass balance, whereas steady-state models were in general use. Dynamic model favored to observe mass transfer phenomena and analyse performance changes as physical property varies (e.g. pore size). This model of PEM fuel cell involved a membrane resistance model which is correlated with water uptake, ion conductiATLAB had been used to compute this model. The model of PEM fuel cell was rigorous and consisted of a large Non-Linear Programming (NLP) problem. The result of computing showed that the important factors of PEM fuel cell performance are the humidity inlet gas and water uptake of membrane.
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