Experimental study of a Capillary Pumped Loop for cooling power electronics: Response to high amplitude heat load steps
Experimental study of a Capillary Pumped Loop for cooling power electronics: Response to high amplitude heat load steps
复制标题
用于冷却电力电子设备的毛细泵回路的实验研究：对高振幅热负载阶跃的响应
DOI：
10.1016/j.applthermaleng.2015.05.015
复制
发表时间：
2015
影响因子：
6.4
通讯作者：
J. Lluc
中科院分区：
文献类型：
--
作者：
Ahmed Kaled;Ahmed Kaled;S. Dutour;S. Dutour;V. Platel;J. Lluc;J. Lluc
在未来陆地电力运输增长的挑战中，毛细管泵送回路（CPL）和环路热管（LHP）处于冷却电力电子解决方案的前沿。在目前的工作中，为地面应用设计的CPL在车辆的标准功率循环中受到快速和大的热负荷（高达2千瓦）的影响。循环时间响应与热负荷阶跃幅值的关系进行了研究：动力学是由冷凝器和储罐之间的液体再分配主导的，其中观察到大的（比稳态值高一个数量级）液体质量流率过冲和过冲。因此，连续热负荷变化的第一分钟是灯芯在机械激发方面的关键时期，实际上，这一瞬态可能导致实质性的回路性能限制：对蒸发器温度稳定性的影响，失效模式。这些结果表明，在突然的大振幅热负荷情况下，基于稳态模型的尺寸不能保证环路性能。
Among the challenges of future increases in electric terrestrial transportation, the Capillary Pumped Loop (CPL) and Loop Heat Pipe (LHP) are at the forefront of the solutions for cooling power electronics. In the present work, a CPL designed for ground applications is subjected to fast and large heat loads (up to 2 kW) as they occur in standard power cycles of vehicles. The loop time response is investigated versus the amplitude of the heat load step: the dynamics is dominated by the liquid redistribution between the condenser and the reservoir in which large (one order of magnitude above the steady state value) liquid mass flow rate overshoots and undershoots are observed. The first minute consecutive to the heat load change is thus a critical period for the wick in terms of mechanical solicitation and actually, this transient can lead to substantial loop performance limitations: effects on the stability of the evaporator temperature, failure mode. These results demonstrate that dimensioning based on a steady-state model will not guarantee loop performance in the event of sudden large amplitude heat loading.