| 摘要 |
PURPOSE:To provide a working fluid comprising fluoro compounds such as pentafluoroethane and trifluoroethane in specific amounts, respectively, further reduced in the affection of the fluoro compounds on the ozone layer of the stratosphere, and capable of being used as a substitute for R22. CONSTITUTION:The objective working fluid comprises a mixture of three kinds of Freon gases consisting of (A) pentafluoroethane (R/25), (B) trifluoroethane (R/43a), and (C) chlorotetrafluoroethane [e.g. 1-chloro-1,1,2,2-tetrafluoroethane (R24a)]. The mixture exists e.g. in a gas-liquid saturation state (having substantially the same vapor pressure as R22) in a region surrounded by the saturated gas phase line (the upper side) and the saturated liquid phase line (the lower side) of the gas-liquid equilibrium line (corresponding to R22 at 0 deg.C) at 0 deg.C under a pressure of 4.044kg/cm<2>.G and by the saturated gas phase line (the points A2-C2) and the saturated liquid phase line (the points D2-F2) of a gas-liquid equilibrium line 2 (corresponding to the R22 at 50 deg.C) at 50 deg.C under 18.782kg/ cm<2>.G. This mixture comprising <=85wt.% of the component A, <=85wt.% (preferably <=80wt.%) of the component B and 15-40wt.% (preferably 15-30wt.%) of the component C. |
