| 摘要 |
PURPOSE:To obtain a working fluid, containing specific amounts of fluorocarb on compounds such as difluoromethane and pentafluoroethane, having a smaller influence on the stratospheric ozonosphere and substitutive for R22. CONSTITUTION:The objective working fluid in which a mixture of, e.g. (A) difluoromethane (R32) with (B) pentafluoroethane (R125) and (C) dichlorotrifluoroethane [e.g. 2,2-dichloro-1,1,1-trifluoroethane (R123)] is in a vapor-liquid equilibrium state (having a vapor pressure nearly equal to that of R22) within the range interposed between a saturated vapor-phase line (upper line) and a saturated liquid-phase line (lower line) of a vapor-phase equilibrium curve 1 (corresponding to the R22 at 0 deg.C) at 0 deg.C under 4.044kg/cm<2>.G and a saturated vapor-phase line (points A1 to C1) and a saturated liquid-phase line (points D1 to F1) of a vapor-liquid equilibrium curve 2 (corresponding to the R22 at 50 deg.C) at 50 deg.C under 18.782kg/cm<2>.G. This mixture in the above-mentioned state comprises 0-90wt.% (preferably 0-85wt.%) component (A), 0-95wt.% component (B) and 5-65wt.% (preferably 5-60wt.%) component (C). |
