WORKING FLUID COMPOSITION FOR REFRIGERATOR, AND REFRIGERATOR OIL

摘要

The present invention provides a working fluid composition for a refrigerator, containing a fluoropropene refrigerant and a refrigerator oil containing an epoxy compound, a phosphorus compound, and an ester of a polyhydric alcohol and a fatty acid, the fatty acid constituting the ester containing at least one species selected from C4-9 fatty acids, and the epoxy compound and the phosphorus compound satisfying the condition represented in formula (1).