本研究中，吾人自行設計一組瓩級水冷式質子交換膜燃料電池堆，且進行不同實驗條件測試，包含:燃料氣體條件、入口水溫、入口水流率，進而了解此三個參數對於電池堆性能輸出與阻抗分析的影響。根據實驗結果進行定性化的檢視，且採用最佳的氣體供應參數，搭配適當的散熱條件，而使溫度分佈均勻性最佳者，做為此電池堆使用。由實驗結果顯示，於水流率5 L/min、水溫55ºC、氫氣計量比1.5、空氣計量比3.0、增濕溫度為65ºC操作下，能使該電池堆展現最佳的性能，而整體發電功率達1,431 W且其發電功率密度為694.8 mW/cm2，而最高發電效率達40.6%。
此外，由實驗結果可得知，於增加水溫與降低水流率條件下，電池堆的溫度較容易提升，而改善電化學反應之進行，故電荷轉移阻抗下降；然而，隨著電池堆溫度的提升，其歐姆阻抗則因薄膜較乾而上升。於低入口水流率下，溫度操作條件對電池堆的性能表現將有顯著之影響，其歸因於電池堆顯著的溫度分佈不均勻性，因此入口水溫的搭配操作尤為關鍵。

In this study, a kW-scale water-cooled PEMFC stacks is designed and tested under different conditions, including fuel conditions, inlet water temperatures , inlet water flow rates, in order to understand effects of the above three parameters on the stack performance and impedance. Based on the qualitative analysis of the experimental results, the gas parameters and thermal management conditions which make the water-cooled PEMFC stack best to be uniform thermally are applied to the stack. The experimental results show that the best performance of this stack, 1431 Watts, and its power density, 694.8 mW/cm2 is exhibited at the inlet water flow rate of 5 L/min, the inlet water temperature of 55oC, the hydrogen stoichiometric ratio of 1.5, the air stoichiometric ratio of 3.0, the air dew point temperature of 65oC. And the maximum power generating efficiency is up to 40.6 %.
In addition, with increasing the inlet water temperature and decreasing the inlet water flow rate will decrease the charge transfer resistance because elevated stack temperatures improve the electrochemical reaction. However, the Ohmic resistance rises due to membrane dehydration at elevated stack temperatures. It is also noticed that the stack performance changes significantly with temperature operating conditions at low inlet water flow rates owing to significantly non-uniform temperature distributions over the stack. As a result, the inlet water temperature becomes a critical operational parameter at low inlet water flow rates.

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