Boychuk A. Viscosity and thermal conductivity of refrigerant mixtures R32/R125, R32/R134a, R125/R134a .

The thesis is devoted to the complex calculation study on the viscosity and thermal conductivity of ozone -friendly refrigerants mixtures R32/R125, R32/R134a and R125/R134a, the formulation of equations and tables of these properties. The methods of measurement and calculation of viscosity and thermal conductivity are reviewed. The accuracy of the obtained experimental data by different methods is analyzed.The optimal calculation method of transport properties is chosen on the basis of available experimental data. The review of the existing experimental data on the viscosity and thermal conductivity of R32, R125 and R134a refrigerants is made,the estimated inaccuracies of these properties are in the range of 0.5–4%.Equations for calculating the viscosity and thermal conductivity of three refrigerants are comp iled in a wide range of parameters, which are presented through independent variables temperature and density.