流体机械

2019, v.47;No.564(06) 56-61

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EXV开度对纯电动汽车热泵空调性能的影响
Effects of EXV Opening on Performance of Electric Automotive Heat Pump Air Conditioning System

华若秋;武卫东;余强元;栾忠骏;
Hua Ruoqiu;Wu Weidong;Yu Qiangyuan;Luan Zhongjun;Institute of Refrigeration and Cryogenics Engineering,University of Shanghai for Science and Technology;

摘要(Abstract):

基于搭建的电动汽车热泵空调系统性能试验台,详细研究了EXV开度变化对系统的冷凝和蒸发压力、过冷度、热泵出风温度、制热量、压缩机功耗和性能系数COP的影响。结果表明:在压缩机转速、冷凝器进风温度和风量一定的条件下,随着EXV开度增加,冷凝压力减小而蒸发压力变化较小,过冷度、制热量和热泵出风温度均呈减小并当EXV开度增大到一定程度后减小幅度变缓,压缩机功耗先减小后基本维持不变,系统COP先增大后减小;冷凝器出口过冷度较大时,通过改变EXV开度可有效调节热泵出风温度,且在开度较小时增大EXV开度有利于获得较高的COP。研究结果可为纯电动汽车热泵空调系统性能的调节和控制策略制定提供参考。
Based on the built performance test rig of the electric automotive heat pump air conditioning system,the effects of variation in EXV opening on condensation and evaporation pressure,subcooling,air outlet temperature of heat pump,heating capacity,compressor power consumption and coefficient of performance(COP) were experimentally investigated. The results show that under the condition of fixed compressor rotational speed,condenser air inlet temperature and air flow rate,as the EXV opening increased,the condensing pressure decreased,but the change in evaporating pressure was relatively small,and subcooling,heating capacity and air outlet temperature of heat pump all decreased and their decrease magnitudes became gentle when the EXV opening increased to a certain extent,and the compressor power consumption decreased at first and then remained basically unchanged,and the system COP increased first then decreased. When the air outlet subcooling of the condenser was relatively big,the air outlet temperature of the heat pump could be effectively adjusted by changing the EXV opening,and when the opening was relatively small, increasing EXV opening was conducive to obtaining a higher COP. The research results can provide a reference for the regulation and control strategy of the performance of the air conditioning system of pure electric automotive heat pump.

关键词(KeyWords): 电子膨胀阀(EXV);热泵空调;电动汽车;调节控制
electronic expansion valve(EXV);heat pump air conditioning system;electric vehicle;regulation and control

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基金项目(Foundation): 教育部留学回国人员科研启动基金项目(LXJJ2015);; 上海市联盟计划项目(LM201709)

作者(Author): 华若秋;武卫东;余强元;栾忠骏;
Hua Ruoqiu;Wu Weidong;Yu Qiangyuan;Luan Zhongjun;Institute of Refrigeration and Cryogenics Engineering,University of Shanghai for Science and Technology;

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