| 摘要 |
The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil comprising an ester of a polyhydric alcohol and a fatty acid, a carbodiimide compound, and a phosphorous compound, and at least one refrigerant selected from 1,1,1,2-tetrafluoroethane and 2,3,3,3-tetrafluoropropene, wherein the polyhydric alcohol comprises pentaerythritol and dipentaerythritol, the fatty acid comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the carbodiimide compound and the phosphorus compound satisfy the conditions represented by the formula (1): 0.11 ‰¦ N C M C ‹ W C N P M P ‹ W P ‰¦ 4.70 wherein, N C represents the number of carbodiimide groups per molecule of the carbodiimide compound, M C represents the molecular weight of the carbodiimide compound, W C represents the content of the carbodiimide compound, N P represents the number of phosphorus atoms per molecule of the phosphorus compound, M P represents the molecular weight of the phosphorus compound, and W P represents the content of the phosphorus compound. |
