| 摘要 |
PROBLEM TO BE SOLVED: To provide a mixed working oil which affects little the stratospheric ozone layer and can be used as such as a substitute for R12 or R134a in a conventional refrigeration cycle equipment. SOLUTION: There are provided a mixed working oil comprising at most 10 wt.% butane (R600) and at least 90 wt.% 1,1,1,2-tetrafluoroethane (R134a) or comprising at most 10 wt.% butane (r600) or isobutane (R600a) and at least 10 wt.% trifluoroiodomethane (CF3 I) and the balance of 1,1,1,2-tetrafluoroethane (R134a) and a refrigeration equipment provided with a compressor 2, a condenser 3, a restrictor 4 and an evaporator 5 and contains a medium being the mixed working oil containing a lubricating oil except at ester oil. |
