Abstract
This work is aimed to present and validate a thermodynamic model that enables the prediction of vapor−liquid equilibria of refrigerant mixtures of alkanes and hydrofluorocarbons, in the temperature and pressure ranges of interest for refrigeration cycles and heat pump applications. A modified Redlich−Kwong−Soave equation of state is used with Huron−Vidal mixing rules and a modified UNIFAC group-contribution approach for calculating the component infinite-pressure activity coefficients. A new classification of functional groups is suggested, and the values of interaction parameters between groups are provided. These parameters are regressed from selected binary vapor−liquid equilibrium data. A good regression is obtained for all group pairs, with a maximum root-mean-square deviation on relative pressure residuals of 1.86%. The proposed method is totally predictive since only the structure, critical constants, and vapor pressure of pure components are needed in order to calculate thermodynamic properties of...
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