Pump-compressor cascade phase-change refrigeration system

doi:10.11949/j.issn.0438-1157.20161412

Abstract

Abstract:

The phase-change refrigeration system of cascade pump-compressor is aimed at high heat flux components heat radiation cooling technology.The characteristics of starting and stable operation and the adaptability on high-temperature environment are investigated in this paper.The results show that at the first stage of the mechanical pump starting,because of the flow characteristics of the refrigerant and the inlet suction effect, the pressure increased firstly and then decreased.At the start time of the heat source, less pressure and temperature fluctuations, heat source starts stably.At stable operation stage, not only the flow rate of system increases from 2.22 g·s^-1 to 5.56 g·s^-1,but also the dryness of the evaporator' outlet declines, pressure drop of the evaporator' outlet increases and the surface temperature of evaporator declines.In the high temperature environment, the refrigeration system can meet the demand of the cooling requirement of heat source, and the fluctuation of pressure and outlet temperature rises.

Key words: phase-change, heat-transfer, micro channels, start-up stage, stable operation, high-temperature environment

摘要：

泵-压缩机复叠式相变冷却系统是针对高热通量发热元件散热问题的主动式冷却技术，以机械泵循环为重点，实验研究了系统的启动特性、稳定运行特性以及环境适应性等工作特性。结果表明：在机械泵启动时，由于入口抽吸作用和系统内工质的流动特性，系统的压力先降低后升高，热源启动时，系统蒸发器和储液器压力温度波动较小，热源启动稳定。稳定运行阶段，系统流量从2.22 g·s^-1增加至5.56 g·s^-1时，蒸发器出口工质干度下降，蒸发器进出口的压降增大、压降的振荡幅度增加，蒸发器表面温度下降。在高温环境中，冷却系统能够满足热源的散热需求，储液器压力和蒸发器出口温度波动增大。

关键词: 相变, 传热, 微通道, 启动阶段, 稳定运行, 高温环境

CLC Number:

TB61⁺1

YUAN Junfei, YAN Xiaona, ZHANG Minhui, WANG Lin. Pump-compressor cascade phase-change refrigeration system[J]. CIESC Journal, 2016, 67(S2): 142-148.

袁俊飞, 闫晓娜, 张敏慧, 王林. 泵-压缩机复叠式相变冷却系统[J]. 化工学报, 2016, 67(S2): 142-148.

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