新能源电动汽车低温热泵型空调系统研究*

doi:10.19562/j.chinasae.qcgc.2020.12.018

Abstract

Abstract: In order to enhance the energy economy of electric vehicles and reduce the degradation of low-temperature heating performance, three solutions of heat pump air conditioning system in low temperature environment are proposed and comparatively analyzed: (1) waste heat recovery and utilization: the waste heat of battery, motor and electric control system is recovered and utilized, optimizing the energy consumption of vehicle while improving the performance of heat pump air conditioning system; (2) vapor-injection heat pump air conditioning system: experimental study is conducted on heat pump air conditioning system using R1234yf refrigerant, and the results show that the heat generating COP with vapor injection is about 10%~30% higher than that without vapor injection. The lower the ambient temperature, the more obvious the improvement of COP;(3) heat pump air conditioning system with CO₂ refrigerant: researches indicate that due to the characteristics of CO₂ refrigerant, heat pump system can provide stable and effective heating at an ambient temperature of - 20　℃. So a conclusion is drawn that at present, vapor injection heat pump air conditioning system is an effective mean for the low temperature heating in electric vehicles, while in the future, the use of natural refrigerant CO₂ will be the inevitable trend

Key words: electric vehicle, low temperature heat pump, R1234yf, waste heat recovery, vapor injection, CO₂

Wang Linlin, Jiao Pengfei, Wang Wei, Yi Hucheng, Mu Liansong, Liu Shuangxi, Xu Xiang. Research on Low Temperature Heat Pump Air Conditioning System in New Energy Electric Vehicle[J].Automotive Engineering, 2020, 42(12): 1744-1750.

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Research on Low Temperature Heat Pump Air Conditioning System in New Energy Electric Vehicle

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