摘要
针对电动汽车热泵用平行流车外换热器,通过建立基于制冷剂不均匀分配的分布参数模型,发现单流程和四流程结构的冬夏总体性能较差。单流程布置与二流程布置相比,夏季工况和冬季湿工况的换热能力分别下降25.3%和23.3%,四流程、三流程和二流程布置的换热能力差别不大。四流程布置和三流程布置的制冷剂侧压降分别是二流程布置的2.5~2.8和1.8~2.5倍。系统试验结果表明:在冬夏各工况下,二流程换热器系统的性能系数COP均高于三流程换热器系统,其中在冬季湿工况下,二流程换热器系统的制热量和COP较三流程换热器系统分别提高6.4%和9.4%。与三流程结构相比,二流程结构更适合电动汽车热泵的车外换热器。
Based on the uneven distribution of refrigerant flow,a thermal-hydraulic simulation mode for the external heat exchanger of heat pumps in electric vehicles was built,and it is found that the overall performance of the layout of single-pass as well as 4-pass is in an inferior position.Compared with that of the 2-pass configuration,the heat transfer capacity of the single-pass configuration is decreases by 25.3%in summer and 23.3%in winter wet conditions,respectively.The difference between the heat transfer capacities of the configurations of 4-pass,3-pass,and 2-pass is insignificant.The refrigerant side pressure drops of the structures of 4-pass and 3-pass are 2.5~2.8 and 1.8~2.5 times those of the structure of 2-pass,respectively.The experimental results of the system show that,under various operating conditions,the coefficient of performance(COP)of the heat pump system with the 2-pass external heat exchanger is higher than that of the heat pump system with the 3-pass external heat exchanger.Under wet operating conditions in winter,the heating capacity and COP of the system with the 2-pass external heat exchanger are increased by 6.4%and 9.4%,respectively,compared to those of the system with the 3-pass external heat exchanger.It is concluded that the 2-pass structure is more suitable for the external heat exchanger of heat pumps in electric vehicles.
作者
赵兰萍
鲍国
郑钦月
杨志刚
ZHAO Lanping;BAO Guo;ZHENG Qinyue;YANG Zhigang(School of Mechanical Engineering,Tongji University,Shanghai 201804,China;Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems,Tongji University,Shanghai 201804,China)
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第7期1114-1123,共10页
Journal of Tongji University:Natural Science
基金
国家重点研发计划(2022YFE0208000)
中央高校基本科研业务费专项资金(2022YFE0208000)。
关键词
电动汽车热泵
平行流车外换热器
流程布置
换热能力
制冷剂侧压降
electric vehicle heat pump
parallel flow heat exchanger outside the vehicle
flow layout
heat transfer capacity
refrigerant side pressure drop
