Heat exchange unit
A heat exchange unit is provided with which, even if a flammable refrigerant is used, the likelihood of the refrigerant reaching an electric component unit is reduced. An outdoor unit ( 20 ) constitutes a portion of an air-conditioning apparatus ( 1 ), and is connected to an indoor unit ( 30 ) via a liquid-side refrigerant connection pipe ( 6 ) and a gas-side refrigerant connection pipe ( 5 ). The outdoor unit ( 20 ) includes an outdoor housing ( 50 ), an outdoor heat exchanger ( 23 ) disposed inside the outdoor housing ( 50 ) and in which a refrigerant flows, a liquid-side shutoff valve ( 29 ) connected to the liquid-side refrigerant connection pipe ( 6 ), a gas-side shutoff valve ( 28 ) connected to the gas-side refrigerant connection pipe ( 5 ), and an outdoor electric component unit ( 8 ) disposed inside the outdoor housing ( 50 ). The refrigerant is a flammable refrigerant containing at least 1,2-difluoroethylene. When the outdoor unit ( 20 ) is in its installed state, the lower end of the outdoor electric component unit ( 8 ) is positioned above the liquid-side shutoff valve ( 29 ) and the gas-side shutoff valve ( 28 ).
1. A heat exchange unit that constitutes a portion of a refrigeration cycle apparatus, the heat exchange unit being one of a service-side unit and a heat source-side unit that are connected to each other via a connection pipe, the heat exchange unit comprising:
a housing;
a heat exchanger disposed inside the housing and in which a refrigerant flows;
a pipe connection part connected to the connection pipe; and
an electric component unit disposed inside the housing,
wherein the refrigerant is a flammable refrigerant,
wherein when the heat exchange unit is in its installed state, a lower end of the electric component unit is positioned above the pipe connection part, 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 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 heat exchange unit that constitutes a portion of a refrigeration cycle apparatus, the heat exchange unit being one of a service-side unit and a heat source-side unit that are connected to each other via a connection pipe, the heat exchange unit comprising:
a housing;
a heat exchanger disposed inside the housing and in which a refrigerant flows;
a pipe connection part connected to the connection pipe; and
an electric component unit disposed inside the housing,
wherein the refrigerant is a flammable refrigerant,
wherein when the heat exchange unit is in its installed state, a lower end of the electric component unit is positioned above the pipe connection part, 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 (0.132y 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.
3. A heat exchange unit that constitutes a portion of a refrigeration cycle apparatus, the heat exchange unit being one of a service-side unit and a heat source-side unit that are connected to each other via a connection pipe, the heat exchange unit comprising:
a housing;
a heat exchanger disposed inside the housing and in which a refrigerant flows;
a pipe connection part connected to the connection pipe; and
an electric component unit disposed inside the housing,
wherein the refrigerant is a flammable refrigerant,
wherein when the heat exchange unit is in its installed state, a lower end of the electric component unit is positioned above the pipe connection part, 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 (0.0072y 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.
4. A heat exchange unit that constitutes a portion of a refrigeration cycle apparatus, the heat exchange unit being one of a service-side unit and a heat source-side unit that are connected to each other via a connection pipe, the heat exchange unit comprising:
a housing;
a heat exchanger disposed inside the housing and in which a refrigerant flows;
a pipe connection part connected to the connection pipe; and
an electric component unit disposed inside the housing,
wherein the refrigerant is a flammable refrigerant,
wherein when the heat exchange unit is in its installed state, a lower end of the electric component unit is positioned above the pipe connection part, 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 (0.0099y 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.
5. A heat exchange unit that constitutes a portion of a refrigeration cycle apparatus, the heat exchange unit being one of a service-side unit and a heat source-side unit that are connected to each other via a connection pipe, the heat exchange unit comprising:
a housing;
a heat exchanger disposed inside the housing and in which a refrigerant flows;
a pipe connection part connected to the connection pipe; and
an electric component unit disposed inside the housing,
wherein the refrigerant is a flammable refrigerant,
wherein when the heat exchange unit is in its installed state, a lower end of the electric component unit is positioned above the pipe connection part, 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 (0.0064y 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.