POLYNOMIAL CURVE-FITS FOR REFRIGERANT THERMODYNAMIC PROPERTIES - EXTENSION TO INCLUDE R134A

Coefficients that extend previously published polynomial curve-fit equ ations for thermodynamic properties of refrigerants to R134a are prese nted. The calculations are simple, and computationally fast; for commo nly encountered refrigeration conditions predicted properties generall y 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 refrigerat ion system performance in which some accuracy must be sacrificed in fa vour of computation speed. The coefficients to extend a simple empiric al method for calculation of energy requirements for commercial and in dustrial refrigeration systems to R134a are also presented. The error in this simple method is less than 3% compared with full mass and ener gy balance calculations.