The Phenomena Analysis of Medium Temperature PEMFC in Different Relative Humidity

• Main Authors: Chao-CHI Shih, 石肇圻
• Other Authors: 翁芳柏
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/60924341515767595782

碩士 === 元智大學 === 機械工程學系 === 96 === When fuel cell operated at medium temperatures can reduce CO poisoning and simplify heat rejection, but cause Nafion type membrane dried out to make membrane degradation. To add mineral can reinforce mechanical strength and hold out water content. The purpose of this study is to analyze the experimental data in the medium temperature tested by homemade cell with Zirconium phosphate .The analysis result shows that computing performance is quite similar to testing performance during cell voltage of 0.3V and 0.7V. At ambient pressure, low humidity and medium temperature, the membrane has higher water content in the upstream. Toward downstream the water forms superheated vapor and then can’t humidify membrane. To add backpressure can enhance catalyst reaction ability. The larger mass flow rate can provide more enough fuel and elevate convection heat transfer to increase membrane conductivity. The counter flow type can make the membrane conductivity more uniform.