摘要
冷却流道设计对质子交换膜燃料电池(protonexchangemembranefuelcell,PEMFC)的热管理性能有重大影响。本研究针对传统平行流道散热性能低等问题,提出了3种新型流道以提高PEMFC的热管理性能。结果表明,新型流道在冷却效率、温度均匀性方面均优于平行流道。其中,新型流道C性能最优,在0.2m/s的冷却液流速下,其最大表面温度较平行流道降低3.22K,温差减少4.09K,体现出在较小压降增幅下实现高效散热的优势。此外,本研究还进一步探究了热通量、冷却液流速对热管理性能的影响。研究发现:高热通量会加剧温度分布不均,凸显了高热负荷下优化热分布均匀性的重要性;而提高流速虽能显著增强冷却效果,但会导致压降急剧上升。因此,实际应用中需在冷却效率与能耗之间寻求平衡。本研究所提出的新型流道设计能够有效提升PEMFC的热管理性能,为推动高功率密度PEMFC的工程化应用提供了理论依据和技术支撑。
Thermal management of micro-electromechanical-system under the extreme temperature condition is an issue that needs to be addressed.The ideal cooling technology(i.e.low energy consumption,safe and reliable)is urgently needed.Therefore,this study proposes a thermal switching composite spontaneous cooling system combined with thermoelectric spontaneous heat dissipation and phase change technology so as to achieve variable power passive cooling.First,the model is constructed and the cooling performance is analyzed.Second,the influence of the related factors(i.e.thermal switch temperature difference,phase change temperature and thickness)on the system cooling is discussed,and the evaluation indexes of heat source temperature and voltage are explored.Finally,the self-supply potential of the system is analyzed.The results show that the optimal phase change temperature of the system is 337.15 K,and the optimal phase change thickness is 2 mm.Under this condition,the peak heat source temperature of the system is 361.55 K,and the production capacity is 0.542 J,which is 40.41%higher than 5 mm.This means greater self-supply power potential.All these could further improve the self-supply power potential and extend the service life of the thermal switch power system.
作者
齐美玲
黄瑛
QI Meiling;HUANG Ying(College of Mechanicul Engineering,Guizhou University,Guiynng 550025,China)
出处
《贵州大学学报(自然科学版)》
2025年第4期50-59,共10页
Journal of Guizhou University:Natural Sciences
基金
贵州省科技计划项目(黔科合基础[2024]1Y076)。
关键词
质子交换膜燃料电池
冷却流道
热管理
数值模拟
温度均匀性
proton exchange membrane fuel cell(PEMFC)
cooling channel
thermal management
numerical simulation
temperature uniformity
