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Critical control volume sizing for improved transient thermal modeling of PEM fuel cells

机译:关键控制体积的大小可改善PEM燃料电池的瞬态热建模

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Many control-oriented models represent the entire fuel cell stack's thermal response with a single lumped temperature. While this simplification greatly reduces the computational expense of these models, it does not afford any information regarding cell-to-cell differences. In many cases, the operating conditions in the outermost (inlet and outlet) cells are significantly different from the rest of the stack. As a result, these cells also often limit the stack performance. Previous experiments performed by the authors have shown this phenomenon, particularly in the inlet cells. Poor performance in these cells led to a gradual decline in the stack average voltage at high loads, and caused the inaccuracy of the lumped fuel cell model prediction. These results suggest a need for individual modeling of the end cells to properly model performance in these areas, particularly during high demand phases.
机译:许多面向控制的模型以单个集总温度表示整个燃料电池堆的热响应。尽管这种简化大大减少了这些模型的计算费用,但它没有提供任何有关单元间差异的信息。在许多情况下,最外面的单元(入口和出口)的工作条件与电池堆的其余部分明显不同。结果,这些单元还经常限制堆叠性能。作者先前进行的实验已经证明了这种现象,特别是在进气孔中。这些电池的不良性能导致在高负载下电池组平均电压逐渐下降,并导致集总燃料电池模型预测的准确性。这些结果表明,需要对端电池进行单独建模,以正确地模拟这些区域中的性能,尤其是在高需求阶段。

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