Reduced complexity models for water management and anode purge scheduling in DEA operation of PEMFCs
Siegel, Jason B. and Yeşilyurt, Serhat and Stefanopoulou, Anna G. (2010) Reduced complexity models for water management and anode purge scheduling in DEA operation of PEMFCs. In: Polymer Electrolyte Fuel Cells 10, Las Vegas, NV (Accepted/In Press)
In this work, the dynamic behavior of Fuel Cell operation under Dead-Ended Anode conditions is shown. A DEA can be fed with dry hydrogen, since water crossing through the membrane is sufficient to humidify the fuel. The reduced requirements for inlet humidification yield a system with lower cost and weight compared to FCs with flow-through or recirculated anodes. The accumulation of water and nitrogen in the anode channel is first observed near the outlet. A stratified pattern develops in the channel where a hydrogen-rich area sits above a depleted region and is stabilized by the effect of gravity. A model is presented which describes the dynamic evolution of a blanketing N2 front in the anode channel and a hydrogen starved region. Understanding, modeling, and predicting the front evolution can reduce the H2 wasted during purges, avoid over drying the membrane, and mitigate degradation associated with hydrogen starved areas.
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