Influence of air flow rate on the performance of air cooled hydrogen fuel cell stack

被引：0
|
作者：
Wei L. [1 ,2 ]
Guo J. [1 ,2 ]
Liao Z. [1 ,2 ,3 ]
Dafalla A.M. [1 ,2 ]
Jiang F. [1 ,2 ]
机构：
[1] Laboratory of Advanced Energy Systems, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), Guangdong, Guangzhou
[2] CAS Key Laboratory of Renewable Energy, Guangdong, Guangzhou
[3] University of Chinese Academy of Sciences, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 07期
关键词：
fuel cell; heat and water management; heat transfer; mass transfer; numerical analysis;
D O I：
10.11949/0438-1157.20220272
中图分类号：
学科分类号：
摘要：
The air cooled hydrogen fuel cell adopts an open cathode, which has the characteristics of self-humidification, simple and portable system, etc. However, its performance is not as well as a water cooled fuel cell. It is necessary to reveal the relationship between temperature and water content in the air cooled fuel cell in order to increase the output power. An 800 W air cooled fuel cell stack assembled in the laboratory was tested and analyzed. The voltage-current curve, net power, mass and heat transfer characteristics of the stack under different air fan speeds were compared. The experimental results show that at low currents the low flow rate under slow fan speed can maintain high temperature in the stack to reduce the activation loss of the catalyst, so that the stack could achieve large net output power. While under high current conditions, low flow rate will lead to excessive temperature and decrease the consistency. The distribution of oxygen concentration, water content and temperature in the fuel cell are visualized by numerical method. It is indicated the ohmic loss caused by low water content is the key factor limiting the output power, and by increasing fan speed and increasing the air flow, a better cooling effect can be ensured, thereby increasing the content water volume, reducing ohmic losses. © 2022 Chemical Industry Press. All rights reserved.
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页码：3222 / 3231
页数：9
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