Abstract
Transportation powertrains need to be versatile in power generation to meet the varying vehicular dynamic loads. The PEM fuel cell stacks within vehicles are therefore designed to meet this additional requirement under part-load and varying-load driving conditions. The size of the on-board energy storage systems can be reduced significantly if the fuel cell powertrain is able to generate the load faithfully in corresponding to the varying demand load. The voltage and pressure drop variations in response to changes in the temperature and load conditions are experimentally studied in the current investigation for characterizing the dynamic system behavior. Temperature of the cell was changed over 20°C - 80°C in short time periods (<600 seconds) and the load conditions were changed by 400 mA/cm2 in 300 seconds. It was observed that changes in load at lower temperatures have a significant impact on the pressure drop in the channels. Additionally, a rapid increase or decreases in temperature have an adverse effect on the cell performance. Rapid increase in cell temperature results in dehydration of the membrane, thereby reducing the performance; while rapidly decreasing the cell temperature may result in increased condensation.
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