Thermodynamic State Surface and Cycle Analysis for Refrigerant 114

Abstract

An equation of state for Refrigerant 114 (CCIF2 CCIF2) was formulated based on available PVT measurements, taking the thermodynamic consistency into consideration. The developed equation of state is expressed by the reduced Helmholtz function as a function of reduced temperature and reduced density. Derived 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 200 to 550 K and of pressures up to 20 MPa, which corresponds to the density range up to 1 750 kg/m3. With the aid of the proposed equation, the cycle analysis for the heat pump, refrigeration and Rankine cycle was carried out, and it became clear that Refrigerant 114 is a suitable working fluid especially for high-temperature heat pump systems.