Abstract
This study concerns with the viscosity for the mixtures of R134a and Lubricant. The emphasis is placed on investigating the oil-concentration dependence on the viscosity for R134a/PAG oil. The measurement was conducted for oil-concentrations up to 32 mass% and temperatures of 278, 283 and 288K. For this measurement the oscillating-cup viscometer making use of polarizer was used. The uncertainty in viscosity was estimated to be less than ±3.5%. The mixture viscosity was found to be nine times greater than that of pure R134a at an oil-concentration of 32 mass%.
