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PEM Fuel Cells by Ken S. Chen, Yun Wang

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8.8 CHAPTER SUMMARY

In this chapter, heat transfer fundamentals in PEM fuel cells are presented and discussed when phase change is absent. The key points in this chapter are summarized as follows:

Heat conduction and convection are the two major modes of heat transfer in PEM fuel cells and radiation is not important or negligible. Conduction dominates heat transfer in membrane, catalyst layers, gas diffusion layers (GDLs), and bipolar plates (BPs), whereas convection is the major mechanism of thermal transport in reactant and cooling flow channels; the reactant gas flow removes less than 5% of total heat generated; the relative importance of convection to conduction can be evaluated by the dimensionless Nusselt number; and thermal conductivity ...

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