# US 11,441,802 B2 · Air conditioning apparatus

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- Number: US 11,441,802 B2
- Document ID: US11441802B2
- Status: Granted
- Kind: B2
- Application number: 16/913,506
- Filed: 2020-06-26
- Published: 2020-11-19
- Granted: 2022-09-13
- Earliest claimed: 2017-12-18
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Mitsushi Itano; Daisuke Karube; Yuuki Yotsumoto; Kazuhiro Takahashi; Yuzo Komatsu; Shun Ohkubo; Tatsuya Takakuwa; Tetsushi Tsuda; Yuuichi Yanagi
- Web page: https://patentgrep.com/patent/US11441802B2

## CPC

- F24F 11/30: for purposes related to the operation of the system, e.g. for safety or monitoring
- F25B 13/00: Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02)
- F24F 1/0003: characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
- F24F 1/00077: {receiving heat exchange fluid entering and leaving the unit as a liquid}
- F24F 1/0068: characterised by the arrangement of refrigerant piping outside the heat exchanger within the unit casing
- F24F 1/30: for use inside the separate outdoor units
- F24F 13/02: Ducting arrangements
- F24F 13/20: Casings or covers
- F25B 9/006: {the refrigerant containing more than one component (F25B9/004 takes precedence)}
- F25B 2313/0293: related to the indoor fan, e.g. controlling speed
- F25B 2313/0294: related to the outdoor fan, e.g. controlling speed
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS

## Abstract

An air conditioning apparatus 1 includes a compressor (321), an indoor heat exchanger (242) that is a use-side heat exchanger that exchanges heat with first air (F1), an outdoor heat exchanger (323) that is a heat-source-side heat exchanger that exchanges heat with second air, a refrigerant, a first duct (209), and a casing (230). The refrigerant contains at least 1,2-difluoroethylene, and circulates in the compressor (321), the indoor heat exchanger (242), and the outdoor heat exchanger (323) to repeat a refrigeration cycle. The first duct (209) supplies the first air (F1) to a plurality of rooms in an interior. The casing (230) includes a use-side space (SP2) that is connected to the first duct (209) and that accommodates the indoor heat exchanger (242). The casing (230) is configured to allow the first air (F1) after heat exchange with the refrigerant at the indoor heat exchanger (242) to be sent out to the first duct (209).

## Claims

### Claim 1

An air conditioning apparatus comprising:
a compressor;
a use-side heat exchanger that exchanges heat with first air;
a heat-source-side heat exchanger that exchanges heat with second air;
a refrigerant that circulates in the compressor, the use-side heat exchanger, and the heat-source-side heat exchanger to repeat a refrigeration cycle;
a first duct that supplies the first air to a plurality of rooms in an interior; and
a casing that includes a use-side space that is connected to the first duct and that accommodates the use-side heat exchanger, the casing being configured to allow the first air after heat exchange with the refrigerant at the use-side heat exchanger to be sent out to the first duct,
wherein the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), and
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, 0.0016x2−0.9473x+57.497, −0.0016x2−0.0527x+42.503),
the line segment A′B is represented by coordinates (x, 0.0029x2−1.0268x+58.7, −0.0029x2+0.0268x+41.3),
the line segment DC′ is represented by coordinates (x, 0.0082x2−0.6671x+80.4, −0.0082x2−0.3329x+19.6),
the line segment C′C is represented by coordinates (x, 0.0067x2−0.6034x+79.729, −0.0067x2−0.3966x+20.271), and
the line segments BD, CO, and OA are straight lines.

### Claim 2 (depends on 1)

The air conditioning apparatus according to claim 1, comprising:
a second duct that introduces the first air from the interior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the interior to the use-side heat exchanger with the casing connected to the second duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 3 (depends on 1)

The air conditioning apparatus according to claim 1, comprising:
a third duct that introduces the first air from an exterior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the exterior to the use-side heat exchanger with the casing connected to the third duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 4 (depends on 1)

The air conditioning apparatus according to claim 1, comprising:
a second duct that is connected to the casing and that supplies the first air introduced from the interior to the use-side space,
wherein the casing is provided with a partition plate that partitions the casing (730) into a heat-source-side space through which the second air introduced from an exterior passes and the use-side space to prevent circulation of air in the heat-source-side space and the use-side space, and
wherein the heat-source-side heat exchanger is disposed in the heat-source-side space.

### Claim 5

An air conditioning apparatus comprising:
a compressor;
a use-side heat exchanger that exchanges heat with first air;
a heat-source-side heat exchanger that exchanges heat with second air;
a refrigerant that circulates in the compressor, the use-side heat exchanger, and the heat-source-side heat exchanger to repeat a refrigeration cycle;
a first duct that supplies the first air to a plurality of rooms in an interior; and
a casing that includes a use-side space that is connected to the first duct and that accommodates the use-side heat exchanger, the casing being configured to allow the first air after heat exchange with the refrigerant at the use-side heat exchanger to be sent out to the first duct,
wherein the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), and
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 (0.0236y2−1.7616y+72.0, y, −0.0236y2+0.7616y+28.0);
the line segment NE is represented by coordinates (0.012y2−1.9003y+58.3, y, −0.012y2+0.9003y+41.7); and
the line segments JN and EI are straight lines.

### Claim 6 (depends on 5)

The air conditioning apparatus according to claim 5, comprising:
a second duct that introduces the first air from the interior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the interior to the use-side heat exchanger with the casing connected to the second duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 7 (depends on 5)

The air conditioning apparatus according to claim 5, comprising:
a third duct that introduces the first air from an exterior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the exterior to the use-side heat exchanger with the casing connected to the third duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 8 (depends on 5)

The air conditioning apparatus according to claim 5, comprising:
a second duct that is connected to the casing and that supplies the first air introduced from the interior to the use-side space,
wherein the casing is provided with a partition plate that partitions the casing (730) into a heat-source-side space through which the second air introduced from an exterior passes and the use-side space to prevent circulation of air in the heat-source-side space and the use-side space, and
wherein the heat-source-side heat exchanger is disposed in the heat-source-side space.

### Claim 9

An air conditioning apparatus comprising:
a compressor;
a use-side heat exchanger that exchanges heat with first air;
a heat-source-side heat exchanger that exchanges heat with second air;
a refrigerant that circulates in the compressor, the use-side heat exchanger, and the heat-source-side heat exchanger to repeat a refrigeration cycle;
a first duct that supplies the first air to a plurality of rooms in an interior; and
a casing that includes a use-side space that is connected to the first duct and that accommodates the use-side heat exchanger, the casing being configured to allow the first air after heat exchange with the refrigerant at the use-side heat exchanger to be sent out to the first duct,
wherein the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), and
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.

### Claim 10 (depends on 9)

The air conditioning apparatus according to claim 9, comprising:
a second duct that introduces the first air from the interior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the interior to the use-side heat exchanger with the casing connected to the second duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 11 (depends on 9)

The air conditioning apparatus according to claim 9, comprising:
a third duct that introduces the first air from an exterior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the exterior to the use-side heat exchanger with the casing connected to the third duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 12 (depends on 9)

The air conditioning apparatus according to claim 9, comprising:
a second duct that is connected to the casing and that supplies the first air introduced from the interior to the use-side space,
wherein the casing is provided with a partition plate that partitions the casing (730) into a heat-source-side space through which the second air introduced from an exterior passes and the use-side space to prevent circulation of air in the heat-source-side space and the use-side space, and
wherein the heat-source-side heat exchanger is disposed in the heat-source-side space.

### Claim 13

An air conditioning apparatus comprising:
a compressor;
a use-side heat exchanger that exchanges heat with first air;
a heat-source-side heat exchanger that exchanges heat with second air;
a refrigerant that circulates in the compressor, the use-side heat exchanger, and the heat-source-side heat exchanger to repeat a refrigeration cycle;
a first duct that supplies the first air to a plurality of rooms in an interior; and
a casing that includes a use-side space that is connected to the first duct and that accommodates the use-side heat exchanger, the casing being configured to allow the first air after heat exchange with the refrigerant at the use-side heat exchanger to be sent out to the first duct,
wherein the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), and
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.

### Claim 14 (depends on 13)

The air conditioning apparatus according to claim 13, comprising:
a second duct that introduces the first air from the interior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the interior to the use-side heat exchanger with the casing connected to the second duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 15 (depends on 13)

The air conditioning apparatus according to claim 13, comprising:
a third duct that introduces the first air from an exterior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the exterior to the use-side heat exchanger with the casing connected to the third duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 16 (depends on 13)

The air conditioning apparatus according to claim 13, comprising:
a second duct that is connected to the casing and that supplies the first air introduced from the interior to the use-side space,
wherein the casing is provided with a partition plate that partitions the casing (730) into a heat-source-side space through which the second air introduced from an exterior passes and the use-side space to prevent circulation of air in the heat-source-side space and the use-side space, and
wherein the heat-source-side heat exchanger is disposed in the heat-source-side space.

### Claim 17

An air conditioning apparatus comprising:
a compressor;
a use-side heat exchanger that exchanges heat with first air;
a heat-source-side heat exchanger that exchanges heat with second air;
a refrigerant that circulates in the compressor, the use-side heat exchanger, and the heat-source-side heat exchanger to repeat a refrigeration cycle;
a first duct that supplies the first air to a plurality of rooms in an interior; and
a casing that includes a use-side space that is connected to the first duct and that accommodates the use-side heat exchanger, the casing being configured to allow the first air after heat exchange with the refrigerant at the use-side heat exchanger to be sent out to the first duct,
wherein the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), and
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.

### Claim 18 (depends on 17)

The air conditioning apparatus according to claim 17, comprising:
a second duct that introduces the first air from the interior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the interior to the use-side heat exchanger with the casing connected to the second duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 19 (depends on 17)

The air conditioning apparatus according to claim 17, comprising:
a third duct that introduces the first air from an exterior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the exterior to the use-side heat exchanger with the casing connected to the third duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 20 (depends on 17)

The air conditioning apparatus according to claim 17, comprising:
a second duct that is connected to the casing and that supplies the first air introduced from the interior to the use-side space,
wherein the casing is provided with a partition plate that partitions the casing (730) into a heat-source-side space through which the second air introduced from an exterior passes and the use-side space to prevent circulation of air in the heat-source-side space and the use-side space, and
wherein the heat-source-side heat exchanger is disposed in the heat-source-side space.

### Claim 21

An air conditioning apparatus comprising:
a compressor;
a use-side heat exchanger that exchanges heat with first air;
a heat-source-side heat exchanger that exchanges heat with second air;
a refrigerant that circulates in the compressor, the use-side heat exchanger, and the heat-source-side heat exchanger to repeat a refrigeration cycle;
a first duct that supplies the first air to a plurality of rooms in an interior; and
a casing that includes a use-side space that is connected to the first duct and that accommodates the use-side heat exchanger, the casing being configured to allow the first air after heat exchange with the refrigerant at the use-side heat exchanger to be sent out to the first duct,
wherein the refrigerant comprises trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), and
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.

### Claim 22 (depends on 21)

The air conditioning apparatus according to claim 21, comprising:
a second duct that introduces the first air from the interior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the interior to the use-side heat exchanger with the casing connected to the second duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 23 (depends on 21)

The air conditioning apparatus according to claim 21, comprising:
a third duct that introduces the first air from an exterior;
a use-side unit that includes the casing and that is configured to guide the first air introduced from the exterior to the use-side heat exchanger with the casing connected to the third duct; and
a heat-source-side unit that accommodates the heat-source-side heat exchanger and that differs from the use-side unit.

### Claim 24 (depends on 21)

The air conditioning apparatus according to claim 21, comprising:
a second duct that is connected to the casing and that supplies the first air introduced from the interior to the use-side space,
wherein the casing is provided with a partition plate that partitions the casing (730) into a heat-source-side space through which the second air introduced from an exterior passes and the use-side space to prevent circulation of air in the heat-source-side space and the use-side space, and
wherein the heat-source-side heat exchanger is disposed in the heat-source-side space.