Polynomial curve-fits for refrigerant thermodynamic properties: extension to include R134a

Abstract

Coefficients that extend previously published polynomial curve-fit equations thermodynamic properties of refrigerants to R134a are presented. The calculations are simple, and computationally fast; for commonly encountered refrigeration conditions predicted properties generally agree with the source data to within about ±0.4%, and differences of more than 0.6% occur only occasionally. This level of accuracy is satisfactory for applications such as dynamic simulation of refrigeration system performance in which some accuracy must be sacrificed in favour of computation speed. The coefficients to extend a simple empirical method for calculation of energy requirements for commercial and industrial refrigeration systems to R134a are also presented. The error in this simple method is less than 3% compared with full mass and energy balance calculations.