Abstract
The results and generalizations of thermophysical property research for the refrigerant/lubricant mixtures are summarized. The methodological aspects of the experimental studies of the thermal properties of real working media for vapor compression refrigeration machines and the general principles of the thermodynamic properties simulation for such solutions are analyzed. It is shown that the admixtures of compressor oil in the refrigerant make the efficiency parameters of compressor systems much lower. The question of a selective solubility of the multicomponent refrigerants in compressor oils is discussed.
Highlights
The transfer of refrigeration equipment to environmentally safe working fluids is still remaining unresolved
It should be emphasized that the real working fluid (RWF) in the vapor compression refrigeration systems is a solution of the refrigerant and the compressor oil
Results of treatment of experimental data for the density and viscosity of the oils and the RWF lead to important conclusion: to describe the bulk properties of the RWF one should use its own set of pseudocritical parameters other than the values obtained in the framework of the theory of thermodynamic similarity based on investigation of the saturated vapor pressure
Summary
The transfer of refrigeration equipment to environmentally safe working fluids is still remaining unresolved. New approaches for prediction the pseudocritical parameters that require a limited volume of the experimental information are given in present study As it was shown above, the surface layer of the RWF has a concentration that differs from the bulk concentration of the solution liquid phase. Results of treatment of experimental data for the density and viscosity of the oils and the RWF lead to important conclusion: to describe the bulk properties of the RWF (density and viscosity) one should use its own set of pseudocritical parameters other than the values obtained in the framework of the theory of thermodynamic similarity based on investigation of the saturated vapor pressure. The composition of the layer differs from the concentrations of the solution coexisting phases This circumstance makes a problem to develop methods of prediction the capillary constant, surface tension and vapor pressure of the RWF.
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