Correlation of Dew- and Bubble-Point Curves for Binary Refrigerant Mixtures

Abstract

This paper reports a correlation of dew- and bubble-point curves for seven binary refrigerant mixtures of engineering importance. The present correlations have been established based upon the reliable measurements of dew and bubble points by the present authors and others using a constant volume method. We have made the present correlations by calculating the differences between the experimental and the calculated values using Raoult's law. After correlating these differences, ΔPd orΔPb with temperatures, we represented these temperature terms in terms of the composition χ₁ of the first components, which have the lower critical temperature of the binary components. It was confirmed that the present correlations for seven binary refrigerant mixtures effectively modeled the dew- and bubble-point curves for any mixture with an arbitrary composition, and reproduced the dew- and bubble-point pressures even in the neighborhood of the critical points where the Soave-Redlich-Kwong equation could not reproduce the measured vapor-liquid equilibria.