Importance

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Abstract

A refrigerant composition includes trifluoroethylene (HFO-1123), difluoromethane (R32), and propane (R290). When mass percentages of the trifluoroethylene, the difluoromethane, and the propane based on a sum of the trifluoroethylene, the difluoromethane, and the propane are respectively represented by x, y, and z, in a ternary composition diagram in which the sum of the trifluoroethylene, the difluoromethane, and the propane is 100 mass %, there are a point A (100.0, 0.0, 0.0), a point B (0.0, 100.0, 0.0), a point C (0.0, 0.0, 100.0), a point D (74.5, 0.0, 25.5), a point E (62.0, 12.4, 25.6), a point F (91.2, 0.0, 8.8), a point G (86.9, 3.1, 10.0), and a point H (0.0, 90.0, 10.0), and a point of coordinates (x, y, z) is within a range of a figure surrounded by a line segment GH connecting the points G and H, a line segment HC connecting the points H and C, a line segment CD connecting the points C and D, a line segment DE connecting the points D and E, and a line segment EG connecting the points E and G or is on at least one of the line segments DE, EG, and GH (except for the points D, E, and G). The line segment DE is represented by coordinates (x, 0.0266x²−4.6248x+196.8859, −0.0266x²+3.6248x−96.8859). A line segment EF connecting the points E and F is represented by coordinates (0.1171z²−5.7627z+132.8115,−0.1171z²+4.7627z−32.8115, z). The line segments GH, HC, and CD are straight lines.

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First Claim