| 摘要 |
PURPOSE:To provide a working fluid which scarcely affects the ozonosphere by using trifluoromethane, pentafluoroethane, and difluoroethane at a specified weight ratio as the essential constituents. CONSTITUTION:A working fluid containing at least three hydrofluorocarbons, i.e., at most 50wt.% trifluoromethane, at most 85wt.% pentafluoroethane, and 15-90wt.% difluoroethane. Since this working fluid is produced by mixing only hydrofluorocarbons that do not contain a chlorine atom in the molecular structure, it scarcely affects the ozonosphere. In addition, it has a vapor pressure comparable to that of chlorodifluoromethane at a service temperature of machinery in which trifuuoromethane cannot be used alone, and it is suitably used as a chlorodifluoromethane substitute in the working fluid for a heat pump of, e.g. an air conditioner or a refrigerator. |
