(US5294359-A)      Refrigerant compsns. comprises (a) 25-60 mol.% difluoro-methane; (b) 40-75 mol.% 1,1,1,2-tetrafluoroethane; and (c) 1-9 mol.% dimethyl ether; and has vapour pressure of 12.2-18.4 p.s.i.a. at -40 deg. F.    Refrigeration comprises condensing the compsn. then evaporating it near a body to be cooled. Heating is produced by condensing it near body to be heated, then evaporating it.    USE/ADVANTAGE -   As substitute for chlorofluorocarbons. Has good chemical stability, low toxicity, non-flammability, efficiency in-use, and low temp. glides.    (JP6511493-W)      Refrigerant compsns. contain difluoromethane (HFC-32) (I), 1,1,1,2-tetrafluoroethane (HFC-134a) (II) and one of 1,1-difluoroethane (HFC-152a) (III), 1,1,1-trifluoroethane (HFC-143a) (IV), propane (V) or dimethyl ether (VI), having a vapour pressure of 12.2-18.4 psia at -40 deg.C.    USE/ADVANTAGE -   For heating and cooling applications and for air-conditioning. The compsns. are replacements for chlorofluorocarbon refrigerants, e.g. monochlorodifluoromethane (HCFC-22) suspected of damaging the earth's ozone layer. The compsns. have zero ozone depletion potential; are a good match for the capacity of HCFC-22; and have higher critical temps. than HCFC-22, giving improved energy efficiency, esp. at higher condensing temps.; temp. glide does not exceed 11 deg.F; and discharge temps. are lower than with HCFC-22, giving improved compressor reliability.    (JP2583013-B2)      Refrigerant compsns. contain difluoromethane (HFC-32) (I), 1,1,1,2-tetrafluoroethane (HFC-134a) (II) and one of 1,1-difluoroethane (HFC-152a) (III), 1,1,1-trifluoroethane (HFC-143a) (IV), propane (V) or dimethyl ether (VI), having a vapour pressure of 12.2-18.4 psia at -40 deg.C.    USE/ADVANTAGE -   For heating and cooling applications and for air-conditioning. The compsns. are replacements for chlorofluorocarbon refrigerants, e.g. monochlorodifluoromethane (HCFC-22) suspected of damaging the earth's ozone layer. The compsns. have zero ozone depletion potential; are a good match for the capacity of HCFC-22; and have higher critical temps. than HCFC-22, giving improved energy efficiency, esp. at higher condensing temps.; temp. glide does not exceed 11 deg.F; and discharge temps. are lower than with HCFC-22, giving improved compressor reliability