| 摘要 |
PURPOSE:To carry out the subject efficient lubrication by using a mixed cooling medium consisting mainly of R-134a and R-22, as cooling media, and specific hydrocarbon compound and/or polyglycol as refrigerating machine oil. CONSTITUTION:In a compression refrigerating system made up of a compressor, condenser, expansion valve or capillary tube and evaporator, the objective lubrication is carried out using, a mixed cooling medium consisting mainly of 1,1,1,2-tetrafluorethane and chlorodifluoromethane and, as refrigerating machine oil, a hydrocarbon compound and/or polyglycol with the dynamic viscosity of 5-500cst at 40 deg.C and surface tension of >=8dyne/cm. |
