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PEM Fuel Cells by Ken S. Chen, Yun Wang

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9.4 SYSTEM-LEVEL ANALYSIS OF COUPLED THERMAL AND WATER MANAGEMENT

The open system of a PEM fuel cell is drawn in Figure 9-34, showing the inputs and outputs of interest. The analysis is established based on the balance of mass and energy. Anode reformate (hydrogen gas, water, and CO2), air, and cooling water are independent streams and not mixed. The following assumptions are made for the analysis:

CH009-F034.tif

Figure 9-34. Open-system schematic of a PEM fuel cell [22].

1. Product water generated in the cathode is assumed to be in the liquid state.

2. Equilibrium between vapor phase and liquid water holds true.

3. The fuel cell is treated as a lumped system ...

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