| abstract |
(57) [Abstract] [Purpose] For refrigerators that have high compatibility with hydrofluorocarbon refrigerants that replace hydrochlorofluorocarbon refrigerants, and that are particularly excellent in hydrolysis resistance and that do not have a negative effect on organic materials used in refrigeration systems. A working fluid composition is provided. [Structure] Cyclic aliphatic hydrocarbon or aromatic hydrocarbon having at least two carboxyl groups in the same ring and 1 A composition for a working fluid of a refrigerating machine, comprising a refrigerating machine oil comprising an ester of a divalent aliphatic alcohol as a base oil, and hydrofluorocarbon. |