流体机械2025，Vol.53Issue(2)：8-15,57,9.DOI:10.3969/j.issn.1005-0329.2025.02.002
室外蒸发器前加气液分离器对霜层分布和换热量的影响
A study on heat distribution and frost formation of an outdoor evaporator with optimized gas-liquid separator added in heat pump air conditioning system for electric vehicle
摘要
Abstract
In responese to the current low temperature conditions of electric rehicle heat pump air conditioning systems,the surface of the outdoor evaporator is prone to frosting,which in turn affects the heat transfer efficiency,system performance,and driving range.Existing research has found that due to the different heat exchange capabilities of the two phases of the refrigerant in the evaporator,the frosting phenomenon is uneven,thus having a negative impact on the system performance.To address this issue,this paper proposes a solution of adding a gas-liquid separator in front of the outdoor evaporator.By adjusting the opening degree of the gas-phase bypass valve,the evaporation pressure can be optimized,and the overall performance of the evaporator and the system can be improved.By comparing the specific variation trends of the system's heat transfer efficiency,coefficient of performance(COP),and the outlet temperature of the evaporator under the conditions of the optimal opening degree of the gas-phase bypass valve and zero opening degree,at different ambienttemperatures(-5,0,5℃),evaporation pressures(0.199,0.242,0.291 MPa),and compressor speeds(2 000,3 000,4 000 r/min),the experimental results show that after adding the gas-liquid separator,the heat transfer efficiency is increased by up to 6.9%,the COP is increased by up to 7.4%,and the outlet air temperature of the evaporator is increased by 3.6%～11.2%.This improved design can effectively alleviate the frosting problem under low-temperature conditions and enhance the system performance.关键词
电动汽车/气液分离器/热泵系统/热泵性能Key words
electric vehicle/gas-liquid separator/heat pump system/heat pump performance分类
建筑与水利引用本文复制引用
苗言明,胡家云,谭明飞,夏丁羽,李超,何其泽,王佳韵,李康..室外蒸发器前加气液分离器对霜层分布和换热量的影响[J].流体机械,2025,53(2):8-15,57,9.基金项目
国家自然科学基金面上项目(52376203) （52376203）
