Abstract: This paper analyzed the key factors and their internal relations which influence the heat transfer capacity and efficiency of air conditioning heat exchangers, through the analysis of thermodynamic theory and the verification of the actual matching of the system. And this paper also analyzed and compared the resistance characteristics and the variation rules of the refrigerant flow of current heat exchanger, and provided some references for the system design of the heat exchanger.

Key words: Refrigerant flow rate, Coefficient of heat transfer, Pressure loss