电子膨胀阀对纯电动冷藏车制冷性能的影响

Influence of electronic expansion valve on the refrigeration performance of pure electric refrigerated vehicles

电子膨胀阀的阀门开度会影响冷藏系统制冷剂的流量,从而影响冷藏系统的制冷性能。在标准焓差实验室中,搭建中压补气型冷藏系统试验台,研究主阀过热度设定值与补阀开度对系统制冷性能的影响。结果表明:系统不补气、补阀开度为0的情况下,主阀过热度设定值为6 K时,冷藏系统的制冷性能最好。系统中压补气、主阀过热度值设定值为6 K的情况下,补阀开度从5%增加到20%时,压缩机排气温度下降了2.52%~6.16%,压缩机功率升高了0.81%~1.57%;补阀开度为10%时,制冷量最大,为4.12 kW,COP最大,为1.66。研究表明,主阀过热度设定值为6 K、补阀开度为10%时,冷藏系统的制冷性能最佳。

The opening degree of the electronic expansion valve affects the refrigerant flow in the refrigeration system,thereby influencing the refrigeration performance of the refrigeration system.In a standard enthalpy difference laboratory,a medium-pressure supplementary gas type refrigeration system test bench was constructed to study the impact of the setting value of the main valve superheat degree and the opening of the supplementary valve on the refrigeration performance of the system.The results show that when there is no supplementary gas and the opening of the supplementary valve is 0,the best refrigeration performance of the refrigeration system is achieved with a setting value of 6 K for the main valve superheat.In the case of medium-pressure supplementary gas and a setting value of 6 K for the main valve superheat,when the opening of the supplementary valve increases from 5% to 20%,the compressor discharge temperature decreases by 2.52% to 6.16%,and the compressor power increases by 0.81% to 1.57%.When the opening of the supplementary valve is 10%,the refrigeration capacity is the highest at 4.12 kW,and the COP is the highest at 1.66.The study indicates that the optimal refrigeration performance of the refrigeration system is achieved when the setting value of 6 K for the main valve superheat,and opening of the supplementary valve is 10%.