초록 ▼

The present invention provides refrigerant blends which are replacements for chlorodifluoromethane(HCFC-22). The present blends have refrigeration characteristics which are similar to HCFC-22. The blends comprise from about 10 to about 90 weight percent of a first component selected from the group c

The present invention provides refrigerant blends which are replacements for chlorodifluoromethane(HCFC-22). The present blends have refrigeration characteristics which are similar to HCFC-22. The blends comprise from about 10 to about 90 weight percent of a first component selected from the group consisting of 1,1,1-trifluoroethane, difluoromethane, propane, and mixtures thereof; from about 1 to about 50 weight percent of a second component selected from the group consisting of hydrofluorocarbon having 1 to 3 carbon atoms, fluorocarbon having 1 to 3 carbon atoms, inorganic compound, and mixtures thereof having a boiling point at atmospheric pressure in the range from about -90 degrees C. to less than -50 degrees C.; and from about 1 to about 50 weight percent of a third component which is hydrofluorocarbon having 1 to 3 carbon atoms, other than 1,1,1-trifluoroethane, having a boiling point at atmospheric pressure in the range from about -50 degrees C. to about -10 degrees C. The refrigerant compositions have a vapor pressure substantially equal to the vapor pressure of HCFC-22.

대표청구항 ▼

[ What is claimed is:] [1.] Refrigerant compositions comprising from about 10 to about 90 weight percent of difluoromethane; from about 1 to about 50 weight percent of carbon dioxide; and from about 1 to about 50 weight percent of a hydrofluorocarbon selected from the group consisting of pentafluoro

[ What is claimed is:] [1.] Refrigerant compositions comprising from about 10 to about 90 weight percent of difluoromethane; from about 1 to about 50 weight percent of carbon dioxide; and from about 1 to about 50 weight percent of a hydrofluorocarbon selected from the group consisting of pentafluoroethane, 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,2,2,3,3-heptafluoropropane, or 1,1,1,2,2-pentafluoropropane, wherein said refrigerant compositions have a vapor pressure substantially equal to the vapor pressure of chlorodifluoromethane.