ABSTRACT

In order to improve the cold-start performance of the fuel cell vehicles, a rapid anode heating system is provided to enable the stack to quickly reach its optimal performance at low temperatures. In this study, a three-dimensional element model of plate-fin heat exchanger has been developed and used to study the effect of structural parameters of staggered fins on the hydrogen transport phenomena and heat transfer performance. A series of simulations were carried out to study the influence of different fin parameters on heat transfer performance. Good agreement is found by comparing the simulation values with the predicted values of the experimental correlation and the deviation is less than 10%. It is shown that fin length has the greatest impact on the thermal performance factor of the radiator, while the contribution of fin thickness is minimal. Experiments show that the maximum heat transfer capacity of the plate-fin heat exchanger reaches 900 W, and the performance of the stack is increased by about 15%. Through the sensitivity analysis of the structural parameters of the hydrogen preheater, the optimal parameter combination was obtained. This research provides guidance for the design of the preheater and plays an important role in improving the low-temperature durability of hydrogen fuel cell engines.

抽象的

为了改善燃料电池车辆的冷启动性能，提供了快速阳极加热系统，以使电池组能够在低温下快速达到其最佳性能。在这项研究中，建立了板翅式换热器的三维元模型，并用于研究交错翅片的结构参数对氢输运现象和传热性能的影响。进行了一系列模拟，以研究不同翅片参数对传热性能的影响。通过将模拟值与实验相关性的预测值进行比较，可以发现良好的一致性，并且偏差小于10％。结果表明，翅片长度对散热器的热性能系数影响最大，而鳍片厚度的贡献最小。实验表明，板翅式换热器的最大传热能力达到900 W，烟囱的性能提高了约15％。通过对氢气预热器结构参数的敏感性分析，获得了最优的参数组合。该研究为预热器的设计提供了指导，对提高氢燃料电池发动机的低温耐久性具有重要作用。