The effects of air stoichiometry and air excess ratio on the transient response of a \PEMFC\ under load change conditions
By Bosung Kim and Dowon Cha and Yongchan Kim
Published in Applied Energy
NULL
2015
Abstract
The transient response of a proton exchange membrane fuel cell (PEMFC) is an important issue for transportation applications. The objective of this study is to investigate the effects of operating and controlling parameters on the transient response of a \PEMFC\ for achieving more stable cell performance under load change conditions. The transient response of a \PEMFC\ was measured and analyzed by varying air stoichiometry, air humidity, and air excess ratio (AER). The optimal air stoichiometry and \AER\ were determined to minimize the voltage drop, undershoot, and voltage fluctuation under the load change, while maintaining high cell performance. Based on the present data, the optimal air stoichiometry was determined to be between 2.0 and 2.5, and the optimal \AER\ was suggested to be between 1.65 and 2.0.
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