Air-conditioning unit

An air-conditioning unit comprising:

• a casing;
• a device provided inside the casing;
• and
• an electric heater provided inside the casing, wherein
• the device is a compressor configured to compress a refrigerant and/or a heat exchanger configured to exchange heat between air and the refrigerant, and
• an electric power consumption of the electric heater is lower than or equal to 300 W, and
• wherein
• the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf),
• wherein
• when the mass % of HFO-1132(E), R32, and R1234yf based on their sum in the refrigerant 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 MM′, M′N, NV, VG, and GM that connect the following 5 points:
• point M (52.6, 0.0, 47.4),
• point M′(39.2, 5.0, 55.8),
• point N (27.7, 18.2, 54.1),
• point V (11.0, 18.1, 70.9), and
• point G (39.6, 0.0, 60.4),
• or on these line segments (excluding the points on the line segment GM);
• the line segment MM′ is represented by coordinates (0.132y2−3.34y+52.6, y, −0.132y2+2.34y+47.4);
• the line segment M′N is represented by coordinates (0.0596y2−2.2541y+48.98, y, −0.0596y2+1.2541y+51.02);
• the line segment VG is represented by coordinates (0.0123y2−1.8033y+39.6, y, −0.0123y2+0.8033y+60.4);
• and
• the line segments NV and GM are straight lines.

An air-conditioning unit comprising:

• a casing;
• a device provided inside the casing;
• and
• an electric heater provided inside the casing, wherein
• the device is a compressor configured to compress a refrigerant and/or a heat exchanger configured to exchange heat between air and the refrigerant, and
• an electric power consumption of the electric heater is lower than or equal to 300 W, and
• wherein
• the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf),
• wherein
• when the mass % of HFO-1132(E), R32, and R1234yf based on their sum in the refrigerant 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 (0.0072y2−0.6701y+37.512, y, −0.0072y2−0.3299y+62.488);
• the line segment NU is represented by coordinates (0.0083y2−1.7403y+56.635, y, −0.0083y2+0.7403y+43.365);
• and
• the line segment UO is a straight line.

An air-conditioning unit comprising:

• a casing;
• a device provided inside the casing;
• and
• an electric heater provided inside the casing, wherein
• the device is a compressor configured to compress a refrigerant and/or a heat exchanger configured to exchange heat between air and the refrigerant, and
• an electric power consumption of the electric heater is lower than or equal to 300 W, and
• wherein
• the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf),
• wherein
• when the mass % of HFO-1132(E), R32, and R1234yf based on their sum in the refrigerant 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 QR, RT, TL, LK, and KQ that connect the following 5 points:
• point Q (44.6, 23.0, 32.4),
• point R (25.5, 36.8, 37.7),
• point T (8.6, 51.6, 39.8),
• point L (28.9, 51.7, 19.4), and
• point K (35.6, 36.8, 27.6),
• or on these line segments;
• the line segment QR is represented by coordinates (0.0099y2−1.975y+84.765, y, −0.0099y2+0.975y+15.235);
• the line segment RT is represented by coordinates (0.0082y2−1.8683y+83.126, y, −0.0082y2+0.8683y+16.874);
• the line segment LK is represented by coordinates (0.0049y2−0.8842y+61.488, y, −0.0049y2−0.1158y+38.512);
• the line segment KQ is represented by coordinates (0.0095y2−1.2222y+67.676, y, −0.0095y2+0.2222y+32.324);
• and
• the line segment TL is a straight line.

An air-conditioning unit comprising:

• a casing;
• a device provided inside the casing;
• and
• an electric heater provided inside the casing, wherein
• the device is a compressor configured to compress a refrigerant and/or a heat exchanger configured to exchange heat between air and the refrigerant, and
• an electric power consumption of the electric heater is lower than or equal to 300 W, and
• wherein
• the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf),
• wherein
• when the mass % of HFO-1132(E), R32, and R1234yf based on their sum in the refrigerant 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 PS, ST, and TP that connect the following 3 points:
• point P (20.5, 51.7, 27.8),
• point S (21.9, 39.7, 38.4), and
• point T (8.6, 51.6, 39.8),
• or on these line segments;
• the line segment PS is represented by coordinates (0.0064y2−0.7103y+40.1, y, −0.0064y2−0.2897y+59.9);
• the line segment ST is represented by coordinates (0.0082y2−1.8683y+83.126, y, −0.0082y2+0.8683y+16.874);
• and
• the line segment TP is a straight line.