| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 101 === In this study, fuel, oxidant supply and cooling systems with a microcontroller unit (MCU) were developed in a compact design to fit two 5 kW proton exchange membrane fuel cell (PEMFC) stacks (Ballard 1310). The original design of the subsystems, which had a longer pipeline and excessive control sensors, caused a large pressure drop and high power consumption. However, with an MCU, the fuel consumption and humidity can be effectively controlled within a proper purge period. Additionally, this study includes stack performances under different hydrogen recycling modes and the direct electrical coupling of two similar 5 kW stacks with diodes to obtain a higher power output. The result showed that the efficiency of the 5 kW stack is 43.46 % with a purge period of 2 minutes with hydrogen recycling and that the hydrogen utilization rate, μf, is 66.31 %. In addition, the maximum power output of the twin-coupled module (a power module with two stacks in electrical cascade/parallel arrangement) is 9.52 kW.
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