PURPOSE: To obtain a working fluid, containing specific amounts of fluorocarbon compounds such as difluoromethane and tetrafluoroethane, 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) tetrafluoroethane [e.g. 1,1,1,2-tetrafluoroethane (R134a)] 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°C) at 0°C under 4.044kg/cm2.G and a saturated vapor-phase line and a saturated liquid-phase line of a vapor-liquid equilibrium curve 2 (corresponding to the R22 at 50°C) at 50°C under 18.782kg/cm2.G. This mixture in the above-mentioned state comprises 20-90wt.% (preferably 25-85wt.%) component (A), 0-80wt.% (preferably 0-75wt.%) component (B) and 0-65wt.% (preferably 0-60wt.%) component (C).
FUNAKURA SHOZO
NAKATANI KAZUO
TAGASHIRA MINORU
