Thermodynamic Analysis and Performance Analysis of Refrigeration Cycle Based on Reduced Temperature

Refrigerant, working conditions and cycle process determine the thermodynamic performance of vapor compression refrigeration cycle. In order to characterize the coupling relationship between the internal variables of the cycle, this paper establishes the relationship between the key physical properties of refrigerant, working conditions and cycle performance based on the thermodynamic analysis method of vapor compression refrigeration cycle:COP = f(C_p', ω, T_cri, Teva, T_con). Combining with the traditional numerical simulation method (calling the key physical parameters of typical refrigerants in NIST to calculate the theoretical performance coefficient of refrigeration cycle), it is found that: 1) Besides temperature parameters, the main influencing factors of COP in refrigeration cycle are specific heat at constant pressure and acentric factor; 2) In refrigeration cycle, the influence of supercooling degree on COP is stronger than that of superheating degree, and the influence law is approximately linear law; 3) At the same reduced temperature of evaporation and condensation, the COP of different refrigerants is approximately equal. The thermodynamic analytical model and conclusions in this paper have certain reference value for refrigerant design of refrigeration cycle and improvement of performance coefficient of actual refrigeration cycle.