电动汽车用热泵空调系统制热性能的试验研究

Experimental research on heating performance of heat pump air-conditioning system for electric vehicle

基于一款电动汽车空调设计热泵空调系统试验台架,研究不同压缩机转速和环境温度条件下双换热器系统和三换热器系统对热泵空调系统换热性能、总成出风口平均温度及系统COP的影响。结果表明,环境温度越高双换热器系统和三换热器系统的换热性能越高,且三换热器系统的性能优势越明显;压缩机转速为5 500 r/min,室外环境温度分别为7℃,1℃和-5℃工况下,三换热器系统较双换热器系统总成出风口平均温度分别高8.0℃,7.2℃和6.1℃,系统COP分别提高15.0%,16.5%和18.2%,电动汽车除霜、除雾的速度提高。

Based on one test bench of heat pump air-conditioning system for the electric vehicle air-conditioning, the impact on the transfer performance, average temperature of the outlet assembly and the COP of heat pump air-conditioning system are studied through two exchangers system and three exchangers system under different compressor^s speeds and ambient temperatures. The test results indicate that： the ambient temperature is higher, the heat transfer performance of the two exchangers system and three exchangers system are higher, and the heat transfer performance advantages of the three exchangers system are more obvious; under 5 500 r/min of the compressor＇s speed and the ambient temperature of 7 ℃,1 ℃ and - 5 ℃, the average temperature of outlet assembly of the three exchangers system is higher than the two exchangers system by 8.0 ℃, 7.2 ℃ and 6.1℃, and the COP is increased by 15.0%, 16.5% and 18.2% respectively. The time of defrosting and demisting is shorten.