为解决燃料电池液冷介质热电性能的兼容问题,该文设计制备了一种基于杂化氮化硼复合相变微胶囊的潜热型功能流体.通过系统的测试和表征对比了多种相变微胶囊和悬浮液样品的物性和换热能力,并将功能流体应用于质子交换膜(PEM)燃料电池冷却过程中,分析了相变微胶囊的掺混浓度对电堆输出特性的影响.结果表明:相变微胶囊的加入最高可以使基液的换热能力提高3.61倍,而对PEM燃料电池输出性能的提升可高达8.6%.相比之下,20%重量百分比浓度的悬浮液综合性能最优,在恒流工况中可将电压变化幅值控制在0.02 V,在变载工况下能有效将电压过冲量以及恢复时长分别减少23.1%和13 s.
Design of hybrid BN composite phase change microcapsule suspension and its application in PEM fuel cell cooling
A latent heat functional fluid based on hybrid boron nitride(BN)composite phase change micro-capsules was designed and prepared to solve the compatibility of thermoelectric properties of proton exchange membrane(PEM)fuel cell cooling medium.The physical properties and heat exchange capacities of a variety of phase change microcapsules and suspension samples were compared through systematic testing and chara-cterization,and the functional fluid was applied to the cooling of PEM fuel cell to analyze the effect of the doping concentration of phase change microcapsules on the output characteristics of the stack.The results show that the incorporation of phase change microcapsules can increase the heat exchange capacity of the base fluid by up to 3.61 times,while the enhancement of the output performance of the PEM fuel cell can be as high as 8.6%.In contrast,the suspension with 20 wt%concentration has the best overall performance,which can control the voltage variation amplitude to 0.02 V under the condition of constant current,and effectively reduce the voltage overshoot and recovery time by 23.1%and 13 s,respectively,under the condition of variable load.
NETL
NSTL
万方数据
