| 摘要 |
PURPOSE:To obtain a working fluid which scarcely affects the ozonosphere and serves as an R22 substitute by mixing pentafluoroethane, trifluoroethane, and difluoroethane. CONSTITUTION:A working fluid containing at least three hydrofluorocarbons, i.e., at most 85wt.% pentafluoroethane, at most 80wt.% trifluoroethane, and 15-35wt.% difluoroethane. As the working fluid, particularly those comprising at most 80wt.% pentafluoroethane, at most 80wt.% trifluoroethane, and 20-30wt.% difluoroethane are preferably used. The working fluid having a composition in the above-mentioned range has a vapor pressure comparable to that of R22 at about 0-50 deg.C, which is the service temperature of a heat pump of, e.g. an air conditioner or a refrigerator, and it can be employed as an R22 substitute in machinery now in use. |
