节点温差对汽车空调制冷系统性能影响  

Influence of node temperature difference on the performance of automobile air conditioning refrigeration system

作　　者：唐景春 王小倩 张秀平 TANG Jingchun;WANG Xiaoqian;ZHANG Xiuping(School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China;Hefei General Machinery Research Institute Co., Ltd., Hefei 230031, China)

机构地区：[1]合肥工业大学汽车与交通工程学院,安徽合肥230009 [2]合肥通用机械研究院有限公司,安徽合肥230031

出　　处：《合肥工业大学学报（自然科学版）》2022年第5期577-581,596,共6页Journal of Hefei University of Technology：Natural Science

基　　金：压缩机技术国家重点实验室(压缩机技术安徽省实验室)开放基金资助项目(SKL-YSJ201914)。

摘　　要：文章选用4种制冷工质,分析在不同的蒸发器出口空气温度、冷凝器出口空气温度下,节点温差对汽车空调制冷系统性能系数的影响规律,并以单位换热面积的系统性能系数为目标函数,对平行流换热器的总换热面积进行优化。研究结果表明:对于所选工质,随着节点温差的增大,制冷系统性能系数降低,换热器面积减小,而目标函数值先升高后降低,即存在最优节点温差使得制冷系统经济性能最佳;在设定的工况条件下,R245fa、R1234ze、R134a、R123对应的最佳冷凝器节点温差分别为4、4、6、4℃,最佳蒸发器节点温差分别为22、20、20、24℃;采用R134a制冷剂时,当蒸发器出口空气温度为15℃、冷凝器出口空气温度为45℃时,单位换热面积的系统性能系数最大。In this paper,four kinds of refrigerants are selected to analyze the influence of node temperature difference on the performance coefficient of automobile air conditioning refrigeration system under different evaporator outlet air temperature and condenser outlet air temperature.And the total heat transfer area of parallel flow heat exchanger is optimized with the system performance coefficient per unit heat transfer area as the objective function.The results show that for the selected refrigerants,with the increase of the node temperature difference,the performance coefficient of the refrigeration system decreases,the area of the heat exchanger decreases,and the objective function value first increases and then decreases,suggesting that there is an optimal node temperature difference which makes the best of the economic performance of the refrigeration system.Under the set operating conditions,the optimal condenser node temperature differences of R245fa,R1234ze,R134a and R123 are 4℃,4℃,6℃and 4℃,respectively,and the optimal evaporator node temperature differences are 22℃,20℃,20℃and 24℃,respectively.As for R134a refrigerant,when the outlet air temperature of evaporator is 15℃and the outlet air temperature of condenser is 45℃,the performance coefficient per unit heat transfer area is the largest.

关 键 词：节点温差 汽车空调 平行流换热器 性能系数 优化 

分 类 号：TB657.5[一般工业技术—制冷工程]