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PEM Fuel Cells by Ken S. Chen, Yun Wang

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8.6 COOLING METHODS

Effective and efficient cooling is critical to water and thermal management of PEM fuel cells, particularly for high-power applications. Cooling PEM fuel cells is more challenging than the internal combustion engines (ICEs) for two major reasons: (1) the exhaust gas of PEM fuel cells, unlike that of ICEs, does not carry along significant amount of waste heat. As a result, the rate of waste heat needed to be dissipated by the cooling ­system is much more (approximately doubled) than that of ICEs. (2) The difference in temperature available for heat transfer in PEM fuel cells is significantly lower (by approximately 50%) than that in ICEs. This is because the working temperature of coolants in a PEM fuel cell (and thus the ...

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