| abstract |
The working fluid composition for refrigerating machine of the present invention contains：Refrigerant, it contains the 1st at least one kind of refrigerant composition in difluoromethane and tetrafluoropropene and the 2nd at least one kind of refrigerant composition in the hydrocarbon selected from carbon dioxide and carbon number 3~4, and global greenhouse effect coefficient is less than 500；And refrigerator oil, it contains oil based at least one kind of in polyol ester, polyvinylether and polyalkylene glycol compounds, and carbon/oxygen mol ratio of the base oil is more than 2.5 and less than 5.8. |