Thermodynamic state surface and cycle analysis for Refrigerant 22.

Abstract

In order to examine thermophysical properties and cycle analysis for a nonazeotropic mixture of Refrigerant 22 (CHCIF2) +Refrigerant 114 (CCIF2CCIF2), and equation of state for Refrigerant 22 was formulated based on the available PVT measurements taking the thermodynamic consistency into consideration . The developed equation of state, whose functional form is the same as that for Refrigerant 114 reported previously, is expressed by the reduce Helmholtz function as a function of temperature and density. The derived properties of isochoric specific heat capacity, isobaric specific heat capacity, speed of sound and vapor pressure were critically examined. The developed equation is effective for a range of temperatures from 200 to 550 K, and of pressures up to 20 MPa, which corresponds to the density range up to 1500 kg/m3. 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 Refrigerant 22 is more suitable for low temperature heat pump systems than Refrigerant 114.