带低压补气的纯电动汽车空调系统制冷性能研究

Study on cooling performance of air-conditioner with low compress vapor inject for pure electric vehicle

为了解决纯电动汽车空调系统在夏季制冷时,由于压缩机排气温度较高所带来的系统制冷性能严重衰减、甚至不能稳定运行的问题,采用低压补气技术,设计了带补气的纯电动汽车热泵空调系统,并搭建了纯电动汽车性能测试实验台。基于R410A制冷剂,研究了压缩机转速在3000~5000 r/min和环境温度在21.00~50.00℃分别变化时,低压补气系统与不补气系统性能的变化。结果表明:在环境温度35℃时,低压补气系统与不补气系统相比,制冷量增加了8%~20%,压缩机排气温度降低了1.30~4.50℃,系统制冷性能系数COP提高了5.8%~18.9%;在压缩机转速4000 r/min时,低压补气系统排气温度均低于不补气系统,尤其在高温50.00℃环境下,低压补气系统排气温度为74.60℃,下降了6.25℃,制冷量增加了0.2%~6.1%,系统制冷性能系数COP提高了1.9%~14.4%。

In summer,due to the high temperature of the compressor of the air conditioner,the refrigeration performance of the pure electric vehicle is seriously attenuated or even unstable operation.In order to solve this problem,the system of heat pump for pure electric vehicle with low compress vapor inject was designed and a pure electric vehicle performance test bench was built.Taking R410 A as refrigerant,the system performances with and without the low compress vapor inject were studied when the compressor speed was between 3000-5000 r/min and the ambient temperature was between 21.00-50.00℃.The results show thatcompared with that of the system without vapor inject,the refrigeration capacity of the system with gas inject increases by 8.0%-20.0%and the refrigeration performance coefficient C OP increases by 5.8%-18.9%,and the compressor discharge temperature reduces by 1.30-4.50℃when the ambient temperature is 35.00℃.The compressor discharge temperatures of the system with vapor inject are lower than that without vapor inject system,especially under the environment of high temperature 50.00℃,the compressor discharge temperatures is 74.60℃,dropped by 6.25℃,the refrigeration capacity increases by 0.2%-6.1%,and the system refrigeration performance coefficient C OP increases by 1.9%-14.4%when the compressor speed was 4000 r/min.