Refrigeration cycle apparatus

Abstract

A refrigeration cycle apparatus that can improve operation efficiency when a refrigerant that contains at least 1,2-difluoroethylene is used is provided. An air conditioning apparatus 1 includes a compressor ( 21 ), an outdoor heat exchanger ( 23 ), an outdoor expansion valve ( 24 ), an indoor heat exchanger ( 31 ), and a suction injection pipe ( 40 ), and uses a refrigerant that contains at least 1,2-difluoroethylene. The suction injection pipe ( 40 ) allows a part of a refrigerant that flows toward the indoor heat exchanger ( 31 ) from the outdoor heat exchanger ( 23 ) to merge with a low-pressure refrigerant that is sucked into the compressor ( 21 ).

1 . A refrigeration cycle apparatus comprising:
 a compressor that sucks a low-pressure refrigerant from a suction flow path compresses the refrigerant, and discharges a high-pressure refrigerant;   a condenser that condenses the high-pressure refrigerant discharged from the compressor;   a decompressor that decompresses the high-pressure refrigerant that has exited from the condenser;   an evaporator that evaporates the refrigerant decompressed at the decompressor; and   an injection flow path that is at least either one of an intermediate injection flow path and a suction injection flow path, the intermediate injection flow path allowing a part of a refrigerant that flows toward the evaporator from the condenser to merge with an intermediate-pressure refrigerant in the compressor, the suction injection flow path allowing a part of a refrigerant that flows toward the evaporator from the condenser to merge with the low-pressure refrigerant that is sucked by the compressor,   wherein the refrigerant contains at least 1,2-difluoroethylene.   
     
     
         2 . The refrigeration cycle apparatus according to  claim 1 , further comprising:
 a branching flow path that branches off from a main refrigerant flow path that connects the condenser and the evaporator to each other;   an opening degree adjusting valve that is provided in the branching flow path; and   an injection heat exchanger that causes a refrigerant that flows in the main refrigerant flow path and a refrigerant that flows on a downstream side with respect to the opening degree adjusting valve in the branching flow path to exchange heat,   wherein a refrigerant that exits from the injection heat exchanger and flows in the branching flow path flows in the injection flow path.   
     
     
         3 . The refrigeration cycle apparatus according to  claim 1 , further comprising:
 a refrigerant storage tank that is provided in a main refrigerant flow path that connects the condenser and the evaporator to each other,   wherein a gas component of a refrigerant that accumulates in the refrigerant storage tank flows in the injection flow path.   
     
     
         4 . The refrigeration cycle apparatus according to  claim 1 , wherein
 the compressor includes a fixed scroll and a swinging scroll, the fixed scroll including a end plate and a lap that stands spirally from the end plate, the swinging scroll forming a compression chamber (Sc) by engaging with the fixed scroll, and   a refrigerant that flows in the injection flow path merges at the compression chamber.   
     
     
         5 . The refrigeration cycle apparatus according to  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and 2,3,3,3-tetrafluoro-1-propene (R1234yf).   
     
     
         6 . The refrigeration cycle apparatus according to  claim 5 ,
 wherein   when the mass % of HFO-1132(E), HFO-1123, 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), HFO-1123, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments AA′, A′B, BD, DC′, C′C, CO, and OA that connect the following 7 points:   
       point A (68.6, 0.0, 31.4), 
       point A′ (30.6, 30.0, 39.4), 
       point B (0.0, 58.7, 41.3), 
       point D (0.0, 80.4, 19.6), 
       point C′ (19.5, 70.5, 10.0), 
       point C (32.9, 67.1, 0.0), and 
       point O (100.0, 0.0, 0.0), 
       or on the above line segments (excluding the points on the line segments BD, CO, and OA);
 the line segment AA′ is represented by coordinates (x, 0.0016x 2 −0.9473x+57.497, −0.0016x 2 −0.0527x+42.503), 
 the line segment A′B is represented by coordinates (x, 0.0029x 2 −1.0268x+58.7, −0.0029x 2 +0.0268x+41.3), 
 the line segment DC′ is represented by coordinates (x, 0.0082x 2 −0.6671x+80.4, −0.0082x 2 −0.3329x+19.6), 
 the line segment C′C is represented by coordinates (x, 0.0067x 2 −0.6034x+79.729, −0.0067x 2 −0.3966x+20.271), and 
 the line segments BD, CO, and OA are straight lines. 
 
     
     
         7 . The refrigeration cycle apparatus according to  claim 5 ,
 wherein   when the mass % of HFO-1132(E), HFO-1123, 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), HFO-1123, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments GI, IA, AA′, A′B, BD, DC′, C′C, and CG that connect the following 8 points:   
       point G (72.0, 28.0, 0.0), 
       point I (72.0, 0.0, 28.0), 
       point A (68.6, 0.0, 31.4), 
       point A′ (30.6, 30.0, 39.4), 
       point B (0.0, 58.7, 41.3), 
       point D (0.0, 80.4, 19.6), 
       point C′ (19.5, 70.5, 10.0), and 
       point C (32.9, 67.1, 0.0), 
       or on the above line segments (excluding the points on the line segments IA, BD, and CG);
 the line segment AA′ is represented by coordinates (x, 0.0016x 2 −0.9473x+57.497, −0.0016x 2 −0.0527x+42.503), 
 the line segment A′B is represented by coordinates (x, 0.0029x 2 −1.0268x+58.7, −0.0029x 2 +0.0268x+41.3), 
 the line segment DC′ is represented by coordinates (x, 0.0082x 2 −0.6671x+80.4, −0.0082x 2 −0.3329x+19.6), 
 the line segment C′C is represented by coordinates (x, 0.0067x 2 −0.6034x+79.729, −0.0067x 2 −0.3966x+20.271), and 
 the line segments GI, IA, BD, and CG are straight lines. 
 
     
     
         8 . The refrigeration cycle apparatus according to  claim 5 ,
 wherein   when the mass % of HFO-1132(E), HFO-1123, 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), HFO-1123, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments JP, PN, NK, KA′, A′B, BD, DC′, C′C, and CJ that connect the following 9 points:   
       point J (47.1, 52.9, 0.0), 
       point P (55.8, 42.0, 2.2), 
       point N (68.6, 16.3, 15.1), 
       point K (61.3, 5.4, 33.3), 
       point A′ (30.6, 30.0, 39.4), 
       point B (0.0, 58.7, 41.3), 
       point D (0.0, 80.4, 19.6), 
       point C′ (19.5, 70.5, 10.0), and 
       point C (32.9, 67.1, 0.0), 
       or on the above line segments (excluding the points on the line segments BD and CJ);
 the line segment PN is represented by coordinates (x, −0.1135x 2 +12.112x−280.43, 0.1135x 2 −13.112x+380.43), 
 the line segment NK is represented by coordinates (x, 0.2421x 2 −29.955x+931.91, −0.2421x 2 +28.955x−831.91), 
 the line segment KA′ is represented by coordinates (x, 0.0016x 2 −0.9473x+57.497, −0.0016x 2 −0.0527x+42.503), 
 the line segment A′B is represented by coordinates (x, 0.0029x 2 −1.0268x+58.7, −0.0029x 2 +0.0268x+41.3), 
 the line segment DC′ is represented by coordinates (x, 0.0082x 2 −0.6671x+80.4, −0.0082x 2 −0.3329x+19.6), 
 the line segment C′C is represented by coordinates (x, 0.0067x 2 −0.6034x+79.729, −0.0067x 2 −0.3966x+20.271), and 
 the line segments JP, BD, and CG are straight lines. 
 
     
     
         9 . The refrigeration cycle apparatus according to  claim 5 ,
 wherein   when the mass % of HFO-1132(E), HFO-1123, 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), HFO-1123, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments JP, PL, LM, MA′, A′B, BD, DC′, C′C, and CJ that connect the following 9 points:   
       point J (47.1, 52.9, 0.0), 
       point P (55.8, 42.0, 2.2), 
       point L (63.1, 31.9, 5.0), 
       point M (60.3, 6.2, 33.5), 
       point A′ (30.6, 30.0, 39.4), 
       point B (0.0, 58.7, 41.3), 
       point D (0.0, 80.4, 19.6), 
       point C′ (19.5, 70.5, 10.0), and 
       point C (32.9, 67.1, 0.0), 
       or on the above line segments (excluding the points on the line segments BD and CJ);
 the line segment PL is represented by coordinates (x, −0.1135x 2 +12.112x−280.43, 0.1135x 2 −13.112x+380.43) the line segment MA′ is represented by coordinates (x, 0.0016x 2 −0.9473x+57.497, −0.0016x 2 −0.0527x+42.503), 
 the line segment A′B is represented by coordinates (x, 0.0029x 2 −1.0268x+58.7, −0.0029x 2 +0.0268x+41.3), 
 the line segment DC′ is represented by coordinates (x, 0.0082x 2 −0.6671x+80.4, −0.0082x 2 −0.3329x+19.6), 
 the line segment C′C is represented by coordinates (x, 0.0067x 2 −0.6034x+79.729, −0.0067x 2 −0.3966x+20.271), and 
 the line segments JP, LM, BD, and CG are straight lines. 
 
     
     
         10 . The refrigeration cycle apparatus according to  claim 5 ,
 wherein   when the mass % of HFO-1132(E), HFO-1123, 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), HFO-1123, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments PL, LM, MA′, A′B, BF, FT, and TP that connect the following 7 points:   
       point P (55.8, 42.0, 2.2), 
       point L (63.1, 31.9, 5.0), 
       point M (60.3, 6.2, 33.5), 
       point A′ (30.6, 30.0, 39.4), 
       point B (0.0, 58.7, 41.3), 
       point F (0.0, 61.8, 38.2), and 
       point T (35.8, 44.9, 19.3), 
       or on the above line segments (excluding the points on the line segment BF);
 the line segment PL is represented by coordinates (x, −0.1135x 2 +12.112x−280.43, 0.1135x 2 −13.112x+380.43), 
 the line segment MA′ is represented by coordinates (x, 0.0016x 2 −0.9473x+57.497, −0.0016x 2 −0.0527x+42.503), 
 the line segment A′B is represented by coordinates (x, 0.0029x 2 −1.0268x+58.7, −0.0029x 2 +0.0268x+41.3), 
 the line segment FT is represented by coordinates (x, 0.0078x 2 −0.7501x+61.8, −0.0078x 2 −0.2499x+38.2), 
 the line segment TP is represented by coordinates (x, 0.00672x 2 −0.7607x+63.525, −0.00672x 2 −0.2393x+36.475), and 
 the line segments LM and BF are straight lines. 
 
     
     
         11 . The refrigeration cycle apparatus according to  claim 5 ,
 wherein   when the mass % of HFO-1132(E), HFO-1123, 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), HFO-1123, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments PL, LQ, QR, and RP that connect the following 4 points:   
       point P (55.8, 42.0, 2.2), 
       point L (63.1, 31.9, 5.0), 
       point Q (62.8, 29.6, 7.6), and 
       point R (49.8, 42.3, 7.9), 
       or on the above line segments;
 the line segment PL is represented by coordinates (x, −0.1135x 2 +12.112x−280.43, 0.1135x 2 −13.112x+380.43), 
 the line segment RP is represented by coordinates (x, 0.00672x 2 −0.7607x+63.525, −0.00672x 2 −0.2393x+36.475), and 
 the line segments LQ and QR are straight lines. 
 
     
     
         12 . The refrigeration cycle apparatus according to  claim 5 ,
 wherein   when the mass % of HFO-1132(E), HFO-1123, 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), HFO-1123, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments SM, MA′, A′B, BF, FT, and TS that connect the following 6 points:   
       point S (62.6, 28.3, 9.1), 
       point M (60.3, 6.2, 33.5), 
       point A′ (30.6, 30.0, 39.4), 
       point B (0.0, 58.7, 41.3), 
       point F (0.0, 61.8, 38.2), and 
       point T (35.8, 44.9, 19.3), 
       or on the above line segments,
 the line segment MA′ is represented by coordinates (x, 0.0016x 2 −0.9473x+57.497, −0.0016x 2 −0.0527x+42.503), 
 the line segment A′B is represented by coordinates (x, 0.0029x 2 −1.0268x+58.7, −0.0029x 2 +0.0268x+41.3), 
 the line segment FT is represented by coordinates (x, 0.0078x 2 −0.7501x+61.8, −0078x 2 −0.2499x+38.2), 
 the line segment TS is represented by coordinates (x, −0.0017x 2 −0.7869x+70.888, −0.0017x 2 −0.2131x+29.112), and 
 the line segments SM and BF are straight lines. 
 
     
     
         13 . The refrigeration cycle apparatus according  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroethylene (HFO-1123) in a total amount of 99.5 mass % or more based on the entire refrigerant, and   the refrigerant comprises 62.0 mass % to 72.0 mass % of HFO-1132(E) based on the entire refrigerant.   
     
     
         14 . The refrigeration cycle apparatus according  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)) and trifluoroethylene (HFO-1123) in a total amount of 99.5 mass % or more based on the entire refrigerant, and   the refrigerant comprises 45.1 mass % to 47.1 mass % of HFO-1132(E) based on the entire refrigerant.   
     
     
         15 . The refrigeration cycle apparatus according  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), 2,3,3,3-tetrafluoro-1-propene (R1234yf), and difluoromethane (R32),   
       wherein
 when the mass % of HFO-1132(E), HFO-1123, R1234yf, and R32 based on their sum in the refrigerant is respectively represented by x, y, z, and a, 
 if 0<a≤11.1, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132(E), HFO-1123, and R1234yf is (100−a) mass % are within the range of a figure surrounded by straight lines GI, IA, AB, BD′, D′C, and CG that connect the following 6 points: 
 
       point G (0.026a 2 −1.7478a+72.0, −0.026a 2 +0.7478a+28.0, 0.0), 
       point I (0.026a 2 −1.7478a+72.0, 0.0, −0.026a 2 +0.7478a+28.0), 
       point A (0.0134a 2 −1.9681a+68.6, 0.0, −0.0134a 2 +0.9681a+31.4), 
       point B (0.0, 0.0144a 2 −1.6377a+58.7, −0.0144a 2 +0.6377a+41.3), 
       point D′ (0.0, 0.0224a 2 +0.968a+75.4, −0.0224a 2 −1.968a+24.6), and 
       point C (−0.2304a 2 −0.4062a+32.9, 0.2304a 2 −0.5938a+67.1, 0.0), 
       or on the straight lines GI, AB, and D′C (excluding point G, point I, point A, point B, point D′, and point C);
 if 11.1<a≤18.2, coordinates (x,y,z) in the ternary composition diagram are within the range of a figure surrounded by straight lines GI, IA, AB, BW, and WG that connect the following 5 points: 
 
       point G (0.02a 2 −1.6013a+71.105, −0.02a 2 +0.6013a+28.895, 0.0), 
       point I (0.02a 2 −1.6013a+71.105, 0.0, −0.02a 2 +0.6013a+28.895), 
       point A (0.0112a 2 −1.9337a+68.484, 0.0, −0.0112a 2 +0.9337a+31.516), 
       point B (0.0, 0.0075a 2 −1.5156a+58.199, −0.0075a 2 +0.5156a+41.801), and 
       point W (0.0, 100.0−a, 0.0), 
       or on the straight lines GI and AB (excluding point G, point I, point A, point B, and point W);
 if 18.2<a≤26.7, coordinates (x,y,z) in the ternary composition diagram are within the range of a figure surrounded by straight lines GI, IA, AB, BW, and WG that connect the following 5 points: 
 
       point G (0.0135a 2 −1.4068a+69.727, −0.0135a 2 +0.4068a+30.273, 0.0), 
       point I (0.0135a 2 −1.4068a+69.727, 0.0, −0.0135a 2 +0.4068a+30.273), 
       point A (0.0107a 2 −1.9142a+68.305, 0.0, −0.0107a 2 +0.9142a+31.695), 
       point B (0.0, 0.009a 2 −1.6045a+59.318, −0.009a 2 +0.6045a+40.682), and 
       point W (0.0, 100.0−a, 0.0), 
       or on the straight lines GI and AB (excluding point G, point I, point A, point B, and point W);
 if 26.7<a≤36.7, coordinates (x,y,z) in the ternary composition diagram are within the range of a figure surrounded by straight lines GI, IA, AB, BW, and WG that connect the following 5 points: 
 
       point G (0.0111a 2 −1.3152a+68.986, −0.0111a 2 +0.3152a+31.014, 0.0), 
       point I (0.0111a 2 −1.3152a+68.986, 0.0, −0.0111a 2 +0.3152a+31.014), 
       point A (0.0103a 2 −1.9225a+68.793, 0.0, −0.0103a 2 +0.9225a+31.207), 
       point B (0.0, 0.0046a 2 −1.41a+57.286, −0.0046a 2 +0.41a+42.714), and 
       point W (0.0, 100.0−a, 0.0), 
       or on the straight lines GI and AB (excluding point G, point I, point A, point B, and point W); and
 if 36.7<a≤46.7, coordinates (x,y,z) in the ternary composition diagram are within the range of a figure surrounded by straight lines GI, IA, AB, BW, and WG that connect the following 5 points: 
 
       point G (0.0061a 2 −0.9918a+63.902, −0.0061a 2 −0.0082a+36.098, 0.0), 
       point I (0.0061a 2 −0.9918a+63.902, 0.0, −0.0061a 2 −0.0082a+36.098), 
       point A (0.0085a 2 −1.8102a+67.1, 0.0, −0.0085a 2 +0.8102a+32.9), 
       point B (0.0, 0.0012a 2 −1.1659a+52.95, −0.0012a 2 +0.1659a+47.05), and 
       point W (0.0, 100.0−a, 0.0), 
       or on the straight lines GI and AB (excluding point G, point I, point A, point B, and point W). 
     
     
         16 . The refrigeration cycle apparatus according to  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), 2,3,3,3-tetrafluoro-1-propene (R1234yf), and difluoromethane (R32),   
       wherein
 when the mass % of HFO-1132(E), HFO-1123, R1234yf, and R32 based on their sum in the refrigerant is respectively represented by x, y, z, and a, 
 if 0<a≤11.1, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132(E), HFO-1123, and R1234yf is (100−a) mass % are within the range of a figure surrounded by straight lines JK′, K′B, BD′, D′C, and CJ that connect the following 5 points: 
 
       point J (0.0049a 2 −0.9645a+47.1, −0.0049a 2 −0.0355a+52.9, 0.0), 
       point K′ (0.0514a 2 −2.4353a+61.7, −0.0323a 2 +0.4122a+5.9, −0.0191a 2 +1.0231a+32.4), 
       point B (0.0, 0.0144a 2 −1.6377a+58.7, −0.0144a 2 +0.6377a+41.3), 
       point D′ (0.0, 0.0224a 2 +0.968a+75.4, −0.0224a 2 −1.968a+24.6), and 
       point C (−0.2304a 2 −0.4062a+32.9, 0.2304a 2 −0.5938a+67.1, 0.0), 
       or on the straight lines JK′, K′B, and D′C (excluding point J, point B, point D′, and point C);
 if 11.1<a≤18.2, coordinates (x,y,z) in the ternary composition diagram are within the range of a figure surrounded by straight lines JK′, K′B, BW, and WJ that connect the following 4 points: 
 
       point J (0.0243a 2 −1.4161a+49.725, −0.0243a 2 +0.4161a+50.275, 0.0), 
       point K′ (0.0341a 2 −2.1977a+61.187, −0.0236a 2 +0.34a+5.636,−0.0105a 2 +0.8577a+33.177), 
       point B (0.0, 0.0075a 2 −1.5156a+58.199, −0.0075a 2 +0.5156a+41.801), and 
       point W (0.0, 100.0−a, 0.0), 
       or on the straight lines JK′ and K′B (excluding point J, point B, and point W);
 if 18.2<a≤26.7, coordinates (x,y,z) in the ternary composition diagram are within the range of a figure surrounded by straight lines JK′, K′B, BW, and WJ that connect the following 4 points: 
 
       point J (0.0246a 2 −1.4476a+50.184, −0.0246a 2 +0.4476a+49.816, 0.0), 
       point K′ (0.0196a 2 −1.7863a+58.515, −0.0079a 2 −0.1136a+8.702, −0.0117a 2 +0.8999a+32.783), 
       point B (0.0, 0.009a 2 −1.6045a+59.318, −0.009a 2 +0.6045a+40.682), and 
       point W (0.0, 100.0−a, 0.0), 
       or on the straight lines JK′ and K′B (excluding point J, point B, and point W);
 if 26.7<a≤36.7, coordinates (x,y,z) in the ternary composition diagram are within the range of a figure surrounded by straight lines JK′, K′A, AB, BW, and WJ that connect the following 5 points: 
 
       point J (0.0183a 2 −1.1399a+46.493, −0.0183a 2 +0.1399a+53.507, 0.0), 
       point K′ (−0.0051a 2 +0.0929a+25.95, 0.0, 0.0051a 2 −1.0929a+74.05), 
       point A (0.0103a 2 −1.9225a+68.793, 0.0, −0.0103a 2 +0.9225a+31.207), 
       point B (0.0, 0.0046a 2 −1.41a+57.286, −0.0046a 2 +0.41a+42.714), and 
       point W (0.0, 100.0−a, 0.0), 
       or on the straight lines JK′, K′A, and AB (excluding point J, point B, and point W); and
 if 36.7<a≤46.7, coordinates (x,y,z) in the ternary composition diagram are within the range of a figure surrounded by straight lines JK′, K′A, AB, BW, and WJ that connect the following 5 points: 
 
       point J (−0.0134a 2 +1.0956a+7.13, 0.0134a 2 −2.0956a+92.87, 0.0), 
       point K′ (−1.892a+29.443, 0.0, 0.892a+70.557), 
       point A (0.0085a 2 −1.8102a+67.1, 0.0, −0.0085a 2 +0.8102a+32.9), 
       point B (0.0, 0.0012a 2 −1.1659a+52.95, −0.0012a 2 +0.1659a+47.05), and 
       point W (0.0, 100.0−a, 0.0), 
       or on the straight lines JK′, K′A, and AB (excluding point J, point B, and point W). 
     
     
         17 . The refrigeration cycle apparatus according to  claim 1 ,
 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 IJ, JN, NE, and EI that connect the following 4 points: 
 
       point I (72.0, 0.0, 28.0), 
       point J (48.5, 18.3, 33.2), 
       point N (27.7, 18.2, 54.1), and 
       point E (58.3, 0.0, 41.7),
 or on these line segments (excluding the points on the line segment EI; 
 the line segment U is represented by coordinates (0.0236y 2 −1.7616y+72.0, y, −0.0236y 2 +0.7616y+28.0); 
 the line segment NE is represented by coordinates (0.012y 2 −1.9003y+58.3, y, −0.012y 2 +0.9003y+41.7); and 
 the line segments JN and EI are straight lines. 
 
     
     
         18 . The refrigeration cycle apparatus according to  claim 1 ,
 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 (0.132y 2 −3.34y+52.6, y, −0.132y 2 +2.34y+47.4); 
 the line segment M′N is represented by coordinates (0.0596y 2 −2.2541y+48.98, y, −0.0596y 2 +1.2541y+51.02); 
 the line segment VG is represented by coordinates (0.0123y 2 −1.8033y+39.6, y, −0.0123y 2 +0.8033y+60.4); and 
 the line segments NV and GM are straight lines. 
 
     
     
         19 . The refrigeration cycle apparatus according to  claim 1 ,
 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 (0.0072y 2 −0.6701y+37.512, y, −0.0072y 2 −0.3299y+62.488); 
 the line segment NU is represented by coordinates (0.0083y 2 −1.7403y+56.635, y, −0.0083y 2 +0.7403y+43.365); and 
 the line segment UO is a straight line. 
 
     
     
         20 . The refrigeration cycle apparatus according to  claim 1 ,
 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 (0.0099y 2 −1.975y+84.765, y, −0.0099y 2 +0.975y+15.235); 
 the line segment RT is represented by coordinates (0.0082y 2 −1.8683y+83.126, y, −0.0082y 2 +0.8683y+16.874); 
 the line segment LK is represented by coordinates (0.0049y 2 −0.8842y+61.488, y, −0.0049y 2 −0.1158y+38.512); 
 the line segment KQ is represented by coordinates (0.0095y 2 −1.2222y+67.676, y, −0.0095y 2 +0.2222y+32.324); and 
 the line segment TL is a straight line. 
 
     
     
         21 . The refrigeration cycle apparatus according to  claim 1 ,
 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 (0.0064y 2 −0.7103y+40.1, y, −0.0064y 2 −0.2897y+59.9); 
 the line segment ST is represented by coordinates 0.0082y 2 −1.8683y+83.126, y, −0.0082y 2 +0.8683y+16.874); and 
 the line segment TP is a straight line. 
 
     
     
         22 . The refrigeration cycle apparatus according to  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and difluoromethane (R32),   
       wherein
 when the mass % of HFO-1132(E), HFO-1123, and R32 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), HFO-1123, and R32 is 100 mass % are within the range of a figure surrounded by line segments IK, KB′, B′H, HR, RQ and GI that connect the following 6 points: 
 
       point I (72.0, 28.0, 0.0), 
       point K (48.4, 33.2, 18.4), 
       point B′ (0.0, 81.6, 18.4), 
       point H (0.0, 84.2, 15.8), 
       point R (23.1, 67.4, 9.5), and 
       point G (38.5, 61.5, 0.0), 
       or on these line segments (excluding the points on the line segments B′H and GI);
 the line segment IK is represented by coordinates (0.025z 2 −1.7429z+72.00, −0.025z 2 +0.7429z+28.0, z), 
 the line segment HR is represented by coordinates (−0.3123z 2 +4.234z+11.06, 0.3123z 2 −5.234z+88.94, z), 
 the line segment RG is represented by coordinates (−0.0491z 2 −1.1544z+38.5, 0.0491z 2 +0.1544z+61.5, z), and 
 the line segments KB′ and GI are straight lines. 
 
     
     
         23 . The refrigeration cycle apparatus according to  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and difluoromethane (R32),   
       wherein
 when the mass % of HFO-1132(E), HFO-1123, and R32 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), HFO-1123, and R32 is 100 mass % are within the range of a figure surrounded by line segments U, JR, RQ and GI that connect the following 4 points: 
 
       point I (72.0, 28.0, 0.0), 
       point J (57.7, 32.8, 9.5), 
       point R (23.1, 67.4, 9.5), and 
       point G (38.5, 61.5, 0.0), 
       or on these line segments (excluding the points on the line segment GI);
 the line segment U is represented by coordinates (0.025z 2 −1.7429z+72.0, −0.025z 2 +0.7429z+28.0, z), 
 the line segment RG is represented by coordinates (−0.0491z 2 −1.1544z+38.5, 0.0491z 2 +0.1544z+61.5, z), and 
 the line segments JR and GI are straight lines. 
 
     
     
         24 . The refrigeration cycle apparatus according to  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and difluoromethane (R32),   
       wherein
 when the mass % of HFO-1132(E), HFO-1123, and R32 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), HFO-1123, and R32 is 100 mass % are within the range of a figure surrounded by line segments MP, PB′, B′H, HR, RQ and GM that connect the following 6 points: 
 
       point M (47.1, 52.9, 0.0), 
       point P (31.8, 49.8, 18.4), 
       point B′ (0.0, 81.6, 18.4), 
       point H (0.0, 84.2, 15.8), 
       point R (23.1, 67.4, 9.5), and 
       point G (38.5, 61.5, 0.0), 
       or on these line segments (excluding the points on the line segments B′H and GM);
 the line segment MP is represented by coordinates (0.0083z 2 −0.984z+47.1, −0.0083z 2 −0.016z+52.9, z), 
 the line segment HR is represented by coordinates (−0.3123z 2 +4.234z+11.06, 0.3123z 2 −5.234z+88.94, z), 
 the line segment RG is represented by coordinates (−0.0491z 2 −1.1544z+38.5, 0.0491z 2 +0.1544z+61.5, z), and 
 the line segments PB′ and GM are straight lines. 
 
     
     
         25 . The refrigeration cycle apparatus according to  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and difluoromethane (R32),   
       wherein
 when the mass % of HFO-1132(E), HFO-1123, and R32 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), HFO-1123, and R32 is 100 mass % are within the range of a figure surrounded by line segments MN, NR, RQ and GM that connect the following 4 points: 
 
       point M (47.1, 52.9, 0.0), 
       point N (38.5, 52.1, 9.5), 
       point R (23.1, 67.4, 9.5), and 
       point G (38.5, 61.5, 0.0), 
       or on these line segments (excluding the points on the line segment GM);
 the line segment MN is represented by coordinates (0.0083z 2 −0.984z+47.1, −0.0083z 2 −0.016z+52.9, z), 
 the line segment RG is represented by coordinates (−0.0491z 2 −1.1544z+38.5, 0.0491z 2 +0.1544z+61.5, z), and 
 the line segments JR and GI are straight lines. 
 
     
     
         26 . The refrigeration cycle apparatus according to  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and difluoromethane (R32),   
       wherein
 when the mass % of HFO-1132(E), HFO-1123, and R32 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), HFO-1123, and R32 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 (31.8, 49.8, 18.4), 
       point S (25.4, 56.2, 18.4), and 
       point T (34.8, 51.0, 14.2), 
       or on these line segments;
 the line segment ST is represented by coordinates (−0.0982z 2 +0.9622z+40.931, 0.0982z 2 −1.9622z+59.069, z), 
 the line segment TP is represented by coordinates (0.0083z 2 −0.984z+47.1, −0.0083z 2 −0.016z+52.9, z), and 
 the line segment PS is a straight line. 
 
     
     
         27 . The refrigeration cycle apparatus according to  claim 1 ,
 wherein   the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and difluoromethane (R32),   
       wherein
 when the mass % of HFO-1132(E), HFO-1123, and R32 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), HFO-1123, and R32 is 100 mass % are within the range of a figure surrounded by line segments QB″, B″D, DU, and UQ that connect the following 4 points: 
 
       point Q (28.6, 34.4, 37.0), 
       point B″ (0.0, 63.0, 37.0), 
       point D (0.0, 67.0, 33.0), and 
       point U (28.7, 41.2, 30.1), 
       or on these line segments (excluding the points on the line segment B″D);
 the line segment DU is represented by coordinates (−3.4962z 2 +210.71z−3146.1, 3.4962z 2 −211.71z+3246.1, z), 
 the line segment UQ is represented by coordinates (0.0135z 2 −0.9181z+44.133, −0.0135z 2 −0.0819z+55.867, z), and 
 the line segments QB″ and B″D are straight lines.