| abstract |
This invention provides, as alternative refrigerants for R404A, a refrigerant and refrigerant composition that have, for example, a nonflammability similar to that of R404A, a refrigerating capacity that can replace that of R404A, a ratio of refrigerating capacity to power consumed in a refrigeration cycle (coefficient of performance (COP)) that is equal or superior to that of R404A, and a lower GWP than that of R404A. More specifically, this invention provides a composition comprising a mixture containing fluorinated hydrocarbons, the composition ratio of the fluorinated hydrocarbons contained in the mixture falling within a triangle having the following three points as vertices in a ternary composition diagram in which the sum of the concentrations of difluoromethane (R32), pentafluoroethane (R125), and 1,1,1,2-tetrafluoroethane (R134a) is 100 wt%: npoint A (R32/R125/R134a = 37.3/17.0/45.7 wt%), npoint F (R32/R125/R134a = 30.7/10.9/58.4 wt%), and npoint G (R32/R125/R134a = 29.4/14.1/56.5 wt%). |