Chiller refrigerants

Abstract

Refrigerant composition are described which include: (a) pentafluoroethane, trifluoromethoxydifluoromethane or hexafluoro-cyclopropane, or a mixture of two or more thereof, in an amount of from 60 to 70% by weight based on the weight of the composition, (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3-heptafluoropropane or a mixture of two or more thereof, in an amount of from 26 to 36% by weight based on the weight of the composition and (c) an ethylenically unsaturated or saturated hydrocarbon, optionally containing one or more oxygen atoms, with a boiling point from −12° C. to +10° C., or a mixture thereof, or a mixture of one or more said hydrocarbons with one or more other hydrocarbons, said mixture having a bubble point from −12° C. to +10° C., in an amount from 1% to 4% by weight based on the weight of the composition.

Dependencies are inferred from the claim text.