Study Of Mixing Rules For Equation Of State And Vapor-Liquid Equilibrium Of Mixture Refrigerants

HCFCs (hydrochlorofluorocarbons) are important refrigerants in vapor compression refrigeration system. However, concern about the depletion of the stratospheric ozone layer by chlorine derived from HCFCs has led to the Montreal Protocol and relative international agreements. These require the phase out of chlorine containing HCFCs. The investigations show that their pure alternative refrigerants hardly exist. Hence, mixture refrigerants are being used as a replacement. As they are environmentally friendly, and excellent thermodynamic and safety performances, the mixture refrigerants with R161 can be considered as alternative refrigerants of HCFCs.Thermodynamic properties of mixture refrigerants are the key factor for using them. Fluid mixture properties described by the equation of state are considered as an effective way, its accuracy is up to that of the mixing rules used. Mixing rules combined with the equation of state and the fluid phase equilibrium are one of the important topics in the present thermodynamics, chemical engineering and refrigeration fields.Based on the thermophysical property data and thermodynamics , vapor-liquid equilibrium of mixture refrigerants with R161 and mixing rules of the equation of state are investigated.The new mixing rule models including the new WS mixing rule, the modified LCVM mixing rule and the modified LCVM-type mixing rule extended to multi-parameter equation of state, are proposed, program is made for calculating the vapor-liquid equilibrium data including polar and non-polar systems for testing the proposed models. The results show that these models not only overcome the some theoretical drawbacks of the existing mixing rules, but also improve the calculation accuracy.A high accuracy experimental apparatus of vapor-liquid equilibrium is developed. It consists of a temperature measurement (range:-20-50℃, temperature uncertainty less than ±10mK),a pressure measure system(range:0-2MPa, the accuracy better than 0.04%FS), water thermostat bath (range:5-100℃), alcohol thermostat bath (range:-40-...