Thermodynamic State Surface and Cycle Analysis for Refrigerant 114

Abstract

An equation of state for Refrigerant 114 (CClF₂ CClF₂) has been 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 temperature and density. Derived isochoric specific heat capacity, isobaric specific heat capacity, speed of sound and vapor pressure have been critically examined. The devoloped equation is effective for a range of temperature 200 to 550 K and of pressures up to 20 MPa which corresponds to the density range up to 1750 kg/m³. With the aid of the proposed equation, the cycle analysis of the heat pump, refrigeration and Rankine cycle has been carried out and it becomes clear that R 114 is a suitable working fluid especially for high temperature heat pump systems.