Abstract

As has been shown in preceding papers, the vapour–liquid equilibria of binary and ternary mixtures of new refrigerants can be calculated mostly within experimental accuracy using simple cubic equations of state. The parameters of these equations are based on properties of the pure substances and on only a few experimental data of a nearly equimolar mixture of the relevant binary systems: critical temperature, critical pressure and vapour pressure at T/ T c=0.7. For the calculation of the densities of the saturated liquid and vapour of these refrigerant mixtures, a so-called volume transformation is applied to the cubic equations of state. As additional information, only experimental data of the critical density and of the saturated-liquid density, preferably at T/ T c=0.6 and 0.8, are required for the pure substances. The saturated-liquid densities have been calculated in this way for binary and ternary mixtures of R32, R125, R143a, and R134a in a wide range of temperatures. The calculated values agree with the available experimental data mostly within 0.5–1%, which corresponds to the usual scattering of the experimental results. Also, the saturated-vapour densities calculated with the same transformed cubic equations of state were compared with available literature data. The average deviation between experimental and calculated data is about 1.5% for the mixtures.

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