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PEM Fuel Cells by Ken S. Chen, Yun Wang

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9.5 CHAPTER SUMMARY

This chapter discusses the phase-change phenomena in PEM fuel cells, including the liquid–vapor (evaporation) and liquid–solid (ice formation or icing) phase changes. The key points in this chapter are summarized as follows:

Heat transfer and water transport are highly coupled in PEM fuel cell operation. Water vapor-phase diffusion is significant and is able to transport ~40% or higher of water produced at 80°C, and heat pipe effect and water vapor-phase diffusion promote each other; the vapor-phase diffusion driven by temperature gradients occurs from the catalyst layer (CL) to the gas flow channel (GFC), and from the region under channel to that under land, and vapor-phase diffusion increases liquid water saturation level ...

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