Patent ID: 11906207
Assignee: DAIKIN INDUSTRIES, LTD.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  C | IPC F

Claim 0:
1. A refrigeration apparatus comprising:
a first cycle including a first compressor, a first radiator, a first expansion mechanism, and a first heat absorber that are arranged in such a manner as to be connected to the first cycle, a first refrigerant circulating through the first cycle; and
a second cycle including a second compressor, a second radiator, a second expansion mechanism, and a second heat absorber that are arranged in such a manner as to be connected to the second cycle, a second refrigerant circulating through the second cycle, wherein
the first heat absorber and the second radiator constitute a heat exchanger in which heat is exchanged between the first refrigerant flowing through the first heat absorber and the second refrigerant flowing through the second radiator, and
at least one of the first refrigerant and the second refrigerant is a refrigerant mixture comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf),
when the mass % of HFO-1132(E), R32, and R1234yf based on their sum in the refrigerant mixture 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 line segments ON, NU, and UO that connect the following 3 points:
point O (22.6, 36.8, 40.6),
point N (27.7, 18.2, 54.1), and
point U (3.9, 36.7, 59.4),
or on these line segments;
the line segment ON is represented by coordinates (0.0072 y2−0.6701y+37.512, y, −0.0072 y2−0.3299y+62.488);
the line segment NU is represented by coordinates (0.0083 y2−1.7403y+56.635, y, −0.0083y2+0.7403y+43.365); and
the line segment UO is a straight line.