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首页> 外文期刊>International journal of green energy >Process modeling of an automotive pern fuel cell system
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Process modeling of an automotive pern fuel cell system

机译：汽车Pern燃料电池系统的过程建模

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摘要

A system level, steady-state thermodynamics model for an automotive PEM fuel cell system was developed to investigate the effects of vehicle speed and operating pressure on the size of the system components, heat and water formation, fuel consumption, fuel cell, and system efficiency. Moreover, the consequences of the choices of membrane's thickness and ionic conductivity on thermal and system efficiencies as a function of vehicle speed are analyzed. The model consists of a PEM fuel cell stack model and supplementary models for all necessary auxiliary components. Results show that increasing the system pressure has a significant positive impact on the water balance characteristics of the system, since less water is needed to reach the required relative humidity levels for the reactants. On the other hand, the high-pressure system requires more power in order to operate the compressor, which in turn, decreases the system efficiency. Decreasing air stoichiometry at high operating pressures improves the water management but has no effect at low pressures. Results also show that increasing the membrane's ionic conductivity and decreasing its thickness enhances the system efficiency especially at higher vehicle speeds. Lastly, it is obtained that the system efficiency decreases as the vehicle speed increases.
机译：开发了用于汽车PEM燃料电池系统的系统级稳态热力学模型，以研究车速和工作压力对系统组件尺寸，热量和水的形成，燃料消耗，燃料电池和系统效率的影响。此外，分析了膜厚度和离子电导率的选择对热效率和系统效率的影响，这些影响是车速的函数。该模型包括一个PEM燃料电池堆模型和所有必要辅助组件的补充模型。结果表明，增加系统压力对系统的水平衡特性有明显的积极影响，因为需要较少的水才能达到反应物所需的相对湿度水平。另一方面，高压系统需要更多功率才能运行压缩机，这又降低了系统效率。在高工作压力下降低空气化学计量比可改善水管理，但在低压下则无效。结果还表明，增加膜的离子电导率并减小其厚度可提高系统效率，尤其是在较高的车速下。最后，获得了随着车速的增加系统效率降低的信息。

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