Composition including refrigerant, use thereof, refrigerator having same, and method for operating said refrigerator

A composition comprising a refrigerant for use in operating air-conditioning equipment for vehicles, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf),

• wherein
• when the mass % of HFO-1132(E), R32, and R1234yf based on their sum is respectively represented by x, y, and z, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132(E), R32, and R1234yf is 100 mass % are within the range of a figure surrounded by straight lines C1D, DG, GH, HB′, and B′C1 that connect the following 5 points:
• point C1 (52.0, 36.9, 11.1),
• point D (44.0, 0.0, 56.0),
• point G (12.2, 0.0, 87.8),
• point H (0.0, 8.2, 91.8), and
• point B′ (0.0, 36.6, 63.4), or on the above straight lines C1D and B′C1 (excluding points D and B′),
• wherein the refrigerant further comprises at least one additional refrigerant selected from the group consisting of:
• acetylene, HFO-1132a, HFO-1141, HFO-1123, Z-HFO-1132, HFO-1243zf, HFC-245cb, HCFC-1122, HCFC-124, CFC-1113, HFC-161, and 3,3,3-trifluoropropyne,
• wherein the total content of HFO-1132(E), R32, and HFO-1234yf is more than 99.5 mass %, based on the total of the refrigerant.