重庆理工大学学报2025，Vol.39Issue(9)：238-245,8.DOI:10.3969/j.issn.1674-8425(z).2025.05.029
电动汽车新型热泵系统制热性能研究
Research on the heating performance of new heat pump systems for electric vehicles
摘要
Abstract
In a low-temperature environment,the heating performance of the heat pump system on electric vehicles is unsatisfactory when it is under the dual heating conditions for both the cabin and the battery.To improve its heating performance,this paper recovers the waste heat of the motor during the operation.The battery and the motor are connected in parallel with the branch of the heat pump system on the cabin side.By using them as another condensation end and evaporation end of the heat pump system,a new type of heat pump system is designed.The Amesim software is employed to build a simulation model,whose reliability is verified according to the experimental results.The heating performance is studied under dynamic working conditions,and the impacts of different temperatures and different vehicle speeds on the performance of the system are analyzed. Results show when operating under one CLTC working condition at 0℃,the heating in the cabin by the new heat pump system is increased by 2.45 times compared with that of the traditional heat pump system.Moreover,the battery temperature rises by 9.6%and the coefficient of performance(COP)of the system is up by 119.02%.Due to the accelerated heating speed of the cabin of the new heat pump system,the rotational speed of the compressor decreases rapidly after the temperature of the passenger compartment reaches its target temperature.The heat obtained by the battery is reduced.Therefore,the temperature rise of the battery is slow in the early stage.With the passing of time,the new system recovers more waste heat from the motor,the compressor gradually increases its rotational speed,and the battery witnesses an accelerated rise in temperature.The higher ambient temperature leads to the faster heating in the cabin.The compressor markedly reduces its rotational speed,causing a decline in the temperature rise of the battery.But the COP of the system increases significantly. The speed of the vehicle mainly affects the temperature rise of the battery,but exerts little impact on the heating speed of the cabin.In the end,the battery temperature increases by 6.6℃,12.3℃and 20.5℃respectively.The faster the vehicle speed,the greater the temperature rise of the battery.Within a time period of 805 seconds to 1 605 seconds,the system at a vehicle speed of 20 m/s has the largest COP.Within this time period,the COP of the system with a vehicle speed of 30 m/s keeps decreasing,and the rotational speed of the compressor rises rapidly.The rotational speed of the compressor does not drop until the open degree of the throttle valve reaches the maximum value,and then the COP of the system rises.关键词
电动汽车/制热性能/余热回收/热泵空调Key words
electric vehicle/heating performance/waste heat recovery/heat pump air conditioner分类
交通工程引用本文复制引用
高春艳,洪连杰,梁坤峰,刘宏波,韩依梦..电动汽车新型热泵系统制热性能研究[J].重庆理工大学学报,2025,39(9):238-245,8.基金项目
国家自然科学基金项目(52378094,52376005) （52378094,52376005）
河南省科技发展项目(222102220033) （222102220033）
