| abstract |
A refrigerant blend to replace refrigerant R-22(chlorodifluoromethane) in refrigeration systems designed to use R-22 as the refrigerating fluid. The inventive refrigerant blend comprises R-134a (1,1,1,2-tetrafluoroethane), R-125 (pentafluoroethane), a hydrocarbon compenent, and, optionally, R-32 (difluoromethane). The hydrocarbon component comprises at least two hydrocarbons having boiling points that bracket the boiling point of R-134a (-15°F, -26°C). The hydrocarbons in one group, designated as Group A, having boiling points lower than the boiling point of R-134a. The hydrocarbons in the other group, designated Group B, having boiling points higher than that of R-134a. |