Thermodynamic state surface and cycle analysis for refrigerant 22+refrigerant 114 system.

Abstract

In order to examine thermophysical properties and cycle analysis for a nonazeotropic mixture of the Refrigerant 22 (CHCIF2) + Refrigerant 114 (CCIF2 CCIF2) system, an equation of state coupled with empirical mixing rules was formulated based on the available PVTx measurements taking thermodynamic consistency into consideration. The developed equation of state is expressed by the Helmholtz function as a function of temperature, density and composition, and is effective for a range of temperatures from 250 to 500 K and of pressures up to 10 MPa, which corresponds to the density range up to the critical value. With the aid of the proposed equation, the cycle analysis on the heat pump and refrigeration systems was theoretically carried out, and it became clear that the Refrigerant 22 + Refrigerant 114 system is suitable for industrial heat pump systems or air-conditioning and hot-water-supply heat pump systems. It was confirmed that the effect of change in composition on the theoretical coefficient of performance had the same behavior as that reported by an experimental testing.