Effects of operating parameters on cell performance of commercialized PEM fuel cells

• Main Authors: Yi-Fang Kuo, 郭益帆
• Other Authors: Wei-Mon Yan
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/45549893371720761254

碩士 === 華梵大學 === 機電工程研究所 === 95 === ABSTRACT In this thesis, the main focus is to experimentally measure the optimal effects of the operating temperature, fuel flow rate, humidity and thickness of proton exchange membrane for the PEM fuel cells with serpentine flow field. In addition, the effects of different parameters on the cell performance and pressure drop of the PEM fuel cells under the real operating conditions are investigated in details. The experimental results reveal that the cell performance would be augmented with an increase in the humidification temperature due to the enhancement in the transport rate of ionic and conductivity of the membrane. Additionally, PEM fuel cell can achieve the optimal performance when the cell temperature matches appropriately with the humidification temperature. As for the pressure drop, the pressure drop is also increased with increasing humidification temperature. For the fuel flow rate effects, the cell performance is improved due to the increase in the fuel flow rate owing to the enhancement in the transport of reacting fuel in the electrode and providing the strong electrochemical reaction. For the effects of the fuel humidity, better cell performance is noted for the inlet fuel condition with pre-humidification. But, the pressure drop is also much larger for the inlet fuel condition with pre-humidification. For the effects of the membrane thickness, the thin membrane has a better cell performance. It can operate at the lower inlet temperature and to obtain better cell performance. In this thesis, it is found that the optimal cell and humidification temperatures are 65℃and 70℃, respectively.