Startup characteristics of pump-assisted capillary phase change loop
Startup characteristics of pump-assisted capillary phase change loop
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DOI：
10.1016/j.applthermaleng.2017.02.043
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发表时间：
2017-11
影响因子：
6.4
通讯作者：
Chi Jiang;Wei Liu;Zhichun Liu;Jinguo Yang;B. Duan;Xiaobing Luo
中科院分区：
文献类型：
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作者：
Chi Jiang;Wei Liu;Zhichun Liu;Jinguo Yang;B. Duan;Xiaobing Luo
在本研究中，实验研究了泵辅助毛细管相变回路在不同工况下的启动特性。为了减小回路的体积和重量，设计了自行设计的叶轮泵。选择甲醇作为工质。试验结果表明，蒸发器的预置条件对启动特性影响较大。当蒸汽室在启动前部分或全部被液体占据时，加热器壁温度曲线出现温度超调。当蒸发器承受较高的热负荷时，补偿室中会产生气泡。在此条件下，回路仍能稳定运行，蒸发器的换热能力得到提高。为了避免补偿腔内出现沸腾现象，降低散热器温度或增加泵送功率是有效的方法。
In this study, startup characteristics of a pump-assisted capillary phase change loop under various operational conditions were experimentally investigated. For the loop fabrication, a self-designed impeller pump was selected to reduce the volume and weight of the loop. Methanol was chosen as the working fluid. The test results indicated that the pre-conditions in the evaporator had a large impact on the startup characteristics. When the vapor chamber was occupied, partially or completely, with liquid before startup, a temperature overshoot appeared in the heater wall temperature profile. As a higher heat load was applied to the evaporator, vapor bubbles generated in the compensation chamber. Under these conditions, the loop still operated steadily, and the heat transfer capability of the evaporator improved. To avoid the boiling conditions that appeared in the compensation chamber, either lowering the heat sink temperature or increasing the pumping power was the effective manner.