Abstract
Objective of this work is the experimental determination of exergy losses of the PEM fuel cell system Nexa from Ballard for different steady-state operating points. After selection of appropriate system boundaries experimental data are substituted into balance equations of the first and second law of thermodynamics. The results are exergy losses due to heat transfer from the stack to the cooling air, due to dissipation of electric power by electronics and due to irreversible electrochemical processes of the stack. These different exergy losses are compared to identify the sub-process with the largest exergy loss and therefore the largest optimization potential.
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