变工况对带涡流发生器的PEMFC性能的影响

Influence of variable operating conditions on performance of PEMFC with vortex generator

中文关键词: 质子交换膜燃料电池，涡流发生器，响应面法，数值模拟，运行工况

英文关键词: Proton exchange membrane fuel cell, Vortex generator, Response surface method, Numerical simulation, Operating conditions

中文摘要:

      质子交换膜燃料电池（PEMFC）是一种高效的能量利用装置。为了提高其工作性能，在其中加装涡流发生器，并研究工况对其性能的影响，对其进行了单因素和多因素影响分析，利用响应面法建立数学关系式。结果表明，加装涡流发生器，可以明显改善PEMFC温度均匀性、提高燃料利用率、改善通道排水，对燃料电池的性能有明显提升，电压为0.4伏时电流密度提升了55.4%；另在所选区间内温度为65℃，相对压力为100kPa，湿度为60%，化学计量比为2.5时，燃料电池的功率密度最大。

英文摘要:

      Phase change walls have the problems such as unsuitable phase change temperature,low energy storage capacity,multiple construction forms but lack of unified performance evaluation. Aimed at the above problems, the performance of phase change material(PCM)mortar and PCM board wall were evaluated and optimized. Solid and liquid paraffin,high density polyethylene (HDPE)was mixed to preparea form-stabilized PCM with a suitable phase change temperature of about 34.000 ℃.The latent heat was increased to more than 2.00 times of the existing literature. Based on the prepared PCM,PCM mortar and PCM board walls were established. According to the heat characteristics and energy saving analysis, the maximumtem perature of inner wall can be reduced by 0.730 ℃and 1.760 ℃ byPCM mortar and PCM board wall compared with normal mortar.The thermal insulation performance of PCM board is better.The heat load of air conditioning can be reduced by 21.9% with the PCM board,which is higher than PCM mortar.However,its raw material costis 3.38 times of that of the traditional mortar,32.8%higher that hat of PCM mortar, but the recovery cycleis 33.3% lower.