Heat source unit and refrigeration cycle apparatus

1. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor; and

a heat source-side heat exchanger, wherein

a refrigerant is used as a refrigerant, and

a design pressure of the heat source unit is lower than 1.5 times a design pressure of the connection pipe,

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 IJ 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.

2. A refrigeration cycle apparatus comprising the service unit, the connection pipe, and the heat source unit according to claim 1 , wherein

the refrigerant is used in the refrigeration cycle apparatus, and

the design pressure of the heat source unit is equivalent to a design pressure in a refrigeration cycle apparatus in which refrigerant R22 or refrigerant R407C is used.

3. The refrigeration cycle apparatus according to claim 2 , wherein

the design pressure of the heat source unit is higher than or equal to 3.0 MPa and lower than or equal to 3.7 MPa.

4. A refrigeration cycle apparatus comprising the service unit, the connection pipe, and the heat source unit according to claim 1 , wherein

the refrigerant is used in the refrigeration cycle apparatus, and

the design pressure of the heat source unit is equivalent to a design pressure in a refrigeration cycle apparatus in which refrigerant R410A or refrigerant R32 is used.

5. The refrigeration cycle apparatus according to claim 4 , wherein

the design pressure of the heat source unit is higher than or equal to 4.0 MPa and lower than or equal to 4.8 MPa.

6. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor;

a heat source-side heat exchanger; and

a control device, wherein

a refrigerant is used as a refrigerant, and

the control device is configured to set or be able to set an upper limit of a controlled pressure of the refrigerant such that the upper limit is lower than 1.5 times a design pressure of the connection pipe,

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 IJ 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.

7. A refrigeration cycle apparatus comprising the service unit, the connection pipe, and the heat source unit according to claim 6 , wherein

the refrigerant is used in the refrigeration cycle apparatus, and

the control device is configured to set or be able to set an upper limit of a controlled pressure of the refrigerant such that the upper limit is equivalent to an upper limit of a controlled pressure in a refrigeration cycle apparatus in which refrigerant R22 or refrigerant R407C is used.

8. The refrigeration cycle apparatus according to claim 7 , wherein

the upper limit of the controlled pressure is set to be higher than or equal to 3.0 MPa and lower than or equal to 3.7 MPa.

9. A refrigeration cycle apparatus comprising the service unit, the connection pipe, and the heat source unit according to claim 6 , wherein

the refrigerant is used in the refrigeration cycle apparatus, and

the control device is configured to set or be able to set an upper limit of a controlled pressure of the refrigerant such that the upper limit is equivalent to an upper limit of a controlled pressure in a refrigeration cycle apparatus in which refrigerant R410A or refrigerant R32 is used.

10. The refrigeration cycle apparatus according to claim 9 , wherein

the upper limit of the controlled pressure is set to be higher than or equal to 4.0 MPa and lower than or equal to 4.8 MPa.

11. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor; and

a heat source-side heat exchanger, wherein

a refrigerant is used as a refrigerant, and

a design pressure of the heat source unit is lower than 1.5 times a design pressure of the

connection pipe,

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.

12. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor; and

a heat source-side heat exchanger, wherein

a refrigerant is used as a refrigerant, and

a design pressure of the heat source unit is lower than 1.5 times a design pressure of the connection pipe,

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.

13. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor; and

a heat source-side heat exchanger, wherein

a refrigerant is used as a refrigerant, and

a design pressure of the heat source unit is lower than 1.5 times a design pressure of the connection pipe,

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.

14. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor; and

a heat source-side heat exchanger, wherein

a refrigerant is used as a refrigerant, and

a design pressure of the heat source unit is lower than 1.5 times a design pressure of the connection pipe,

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.

15. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor;

a heat source-side heat exchanger; and

a control device, wherein

a refrigerant is used as a refrigerant, and

the control device is configured to set or be able to set an upper limit of a controlled pressure of the refrigerant such that the upper limit is lower than 1.5 times a design pressure of the connection pipe,

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.

16. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor;

a heat source-side heat exchanger; and

a control device, wherein

a refrigerant is used as a refrigerant, and

the control device is configured to set or be able to set an upper limit of a controlled pressure of the refrigerant such that the upper limit is lower than 1.5 times a design pressure of the connection pipe,

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.

17. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor;

a heat source-side heat exchanger; and

a control device, wherein

a refrigerant is used as a refrigerant, and

the control device is configured to set or be able to set an upper limit of a controlled pressure of the refrigerant such that the upper limit is lower than 1.5 times a design pressure of the connection pipe,

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.

18. A heat source unit that is connected via a connection pipe to a service unit including a service-side heat exchanger and that is a component of a refrigeration cycle apparatus, the heat source unit comprising:

a compressor;

a heat source-side heat exchanger; and

a control device, wherein

a refrigerant is used as a refrigerant, and

the control device is configured to set or be able to set an upper limit of a controlled pressure of the refrigerant such that the upper limit is lower than 1.5 times a design pressure of the connection pipe,

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.