REFRIGERATOR OIL AND WORKING FLUID COMPOSITION FOR REFRIGERATING MACHINE.

摘要

Disclosed is a refrigerator oil characterized by containing an ester of a polyhydric alcohol and a fatty acid containing 50-100% by mole of a fatty acid having 5-9 carbon atoms, not less than 30% by mole of a branched fatty acid having 5-9 carbon atoms, and not more than 40% by mole of a straight chain fatty acid having 5 or less carbon atoms. This refrigerator oil is also characterized by being used together with a fluoropropene refrigerant and/or a trifluoroiodomethane refrigerant. Also disclosed is a working fluid composition for refrigerating machines which is characterized by containing the above-described ester, and a fluoropropene refrigerant and/or a trifluoroiodomethane refrigerant.