(0035) Performance of the PEM fuel cell module. Part 2. Effect of excess ratio and stack temperature

Janusz T. Cieśliński


The paper describes a fuel cell based system performance under different thermal conditions. The system is based on two fuel cell units (1,2 kW each, produced by Ballard Power Systems Inc. and called Nexa), DC/DC converter, DC/AC inverter, microprocessor control unit, load unit, bottled hydrogen supply system and set of measurement instruments. In present study steady-state operation of the PEM fuel cell system at different values of air excess ratio and different stack temperature was investigated. The load of the system was provided with the aid of the set of resistors. Obtained results show that the net power of the system does not depend on the air excess ratio within the range of from 1.9 to 5.0. The polarization curves of the fuel cell module showed that the fuel cell performance was improved with increase stack temperature within the range of 30°C to 65°C.

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