The cooling and humidification systems have a great influence on design, operation and overall performance of proton exchange membrane fuel cell (PEMFC) stacks. The choice of air cooling or water cooling system implies different dimensions, compactness, flow channels configurations, active area and, thus, different temperature profiles and performance. Two stacks, characterized by these cooling systems, have been tested by varying some operating parameters. The stacks have been fed with a hydrogen reach gas and their behaviour, under different working conditions, have been compared.
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