| abstract |
In a refrigeration system using a refrigerant containing hydrocarbons, difluoromethane and unsaturated fluorinated hydrocarbons, compatibility and thermal / chemical stability are achieved without requiring significant changes to existing systems. And providing a working fluid composition for a refrigerator. A working fluid composition for a refrigerator according to the present invention comprises a mixed refrigerant containing hydrofluoroethane, difluoromethane and 2,3,3,3-tetrafluoropropene represented by the following general formula (A): A refrigerating machine oil containing at least one selected from a polyol ester, a polyvinyl ether and a polyalkylene glycol compound as a base oil, wherein the base oil has a carbon / oxygen molar ratio of 2.5 to 5.8. . [Selection figure] None |