Thermophysical Properties of 1,1,1,2-Tetrafluoroethane (CH2FCF3) Refrigerant−Oil Mixtures in the Saturated Liquid Phase with Lubricant Concentration in the Range (0 to 100) ppm

Abstract

The kinematic viscosity, the specific heat capacity at constant pressure, the specific heat capacity at constant volume, and the surface tension of 1,1,1,2-tetrafluoroethane (R134a) refrigerant−oil mixtures in the saturated liquid phase were measured when the lubricant concentrations were (20, 50, 80, and 100) ppm. According to the experimental results, the effect of lubricant concentration on the above four thermophysical properties was analyzed, and the relational expressions describing the relation between these four thermophysical properties and temperature and lubricant concentration were also established.