Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
  • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
  • F24F1/08—Compressors specially adapted for separate outdoor units
  • F24F1/10—Arrangement or mounting thereof
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
  • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
  • F24F1/14—Heat exchangers specially adapted for separate outdoor units
  • F24F1/16—Arrangement or mounting thereof
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
  • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
  • F24F1/46—Component arrangements in separate outdoor units

Definitions

• This disclosure relates to an outdoor unit for an air conditioner having an outdoor heat exchanger, and to the air conditioner.
• an outdoor unit for an air conditioner that has an outdoor heat exchanger that has an inlet header and an outlet header that extend vertically, and a plurality of flat tubes that are connected at one end to the inlet header and the other end to the outlet header and are arranged in parallel at a predetermined interval in the vertical direction, with refrigerant flowing horizontally through the flat tubes (see, for example, Patent Document 1).
• the outdoor unit of the air conditioner in Patent Document 1 is a top-flow type with a fan located above, and the outdoor heat exchanger located inside the housing includes an inlet header located on the refrigerant inlet side, an outlet header located on the refrigerant outlet side, a partition plate installed inside one of the inlet or outlet headers to divide the internal space into multiple rooms, multiple flat tubes connected in parallel between each of the multiple rooms and the other of the inlet or outlet header, a distributor installed in the refrigerant piping, and multiple branch pipes connecting each room to the distributor.
• the branch pipes have branch sections between the rooms and the distributor depending on the air speed distribution in this outdoor heat exchanger, and the number of branch sections of the branch pipes connected to rooms connected to flat tubes located in areas with high air speeds is fewer than the number of branch sections of the branch pipes connected to rooms connected to flat tubes located in areas with low air speeds.
• This disclosure has been made to solve the above-mentioned problems, and aims to provide an outdoor unit for a top-flow type air conditioner in which multiple heat exchangers, in which refrigerant flows vertically through heat transfer tubes, are arranged along different sides of the housing, and an air conditioner that has improved heat exchange performance.
• the outdoor unit of an air conditioner is a top-flow type outdoor unit for an air conditioner comprising a box-shaped housing forming an outer shell, multiple heat exchangers arranged along different side surfaces of the housing, a compressor arranged on the bottom surface of the housing, and an outdoor fan arranged on the top of the housing, wherein the multiple heat exchangers each extend vertically and are arranged at intervals in a direction along the side surface closest to them, and comprise multiple heat transfer tubes through which a refrigerant flows; at least one group of heat transfer tubes arranged at intervals in an air flow direction perpendicular to the direction along the side surface closest to them; and a header provided below the most downstream group of heat transfer tubes arranged furthest downstream in the air flow direction, and having a refrigerant inlet through which the refrigerant flows from outside; and the compressor is arranged in an area facing within the upstream three-quarters of the refrigerant flow of the header of the heat exchanger closest to it among the multiple heat exchangers, in a plan
• the outdoor unit of the air conditioner disclosed herein is an outdoor unit of a top-flow type air conditioner that includes a box-shaped housing that forms the outer shell, multiple heat exchangers arranged along different sides of the housing, a compressor arranged on the bottom surface of the housing, and an outdoor fan arranged on the top of the housing, and the multiple heat exchangers each extend in the vertical direction and are arranged at intervals in a direction along the side closest to them, and are made up of multiple heat transfer tubes through which a refrigerant flows, and are arranged at intervals in an air flow direction perpendicular to the direction along the side closest to them.
• the header has a double-tube structure with an inner tube having multiple orifices formed at intervals in the extension direction, and the compressor is located in an area facing within the upstream 5/6 of the refrigerant flow portion of the header of the heat exchanger that is closest to the multiple heat exchangers in plan view.
• a top-flow type air conditioner has multiple heat exchangers arranged along different sides of the housing, with refrigerant flowing vertically through heat transfer tubes.
• the compressor is positioned in a region facing, in plan view, within the upstream three-quarters of the refrigerant flow in the header of the heat exchanger that is closest to the multiple heat exchangers.
• the header has a double-tube structure with an inner tube having multiple orifices spaced apart in the extension direction
• the compressor is positioned in a region facing, in plan view, within the upstream five-sixths of the refrigerant flow in the header of the heat exchanger that is closest to the multiple heat exchangers.
• compressors with large occupying volumes are positioned in regions where the liquid distribution flow rate is low and a large heat exchange volume is not expected, and compressors with large occupying volumes are not positioned in regions where the liquid distribution flow rate is high and a larger heat exchange volume is expected, thereby ensuring a high air velocity.
• This increases the air velocity in regions where the liquid refrigerant distribution volume is high and decreases the air velocity in regions where the liquid refrigerant distribution volume is low, thereby improving heat exchange performance.
• FIG. 1 is a diagram for explaining a refrigeration cycle system according to a first embodiment; 1 is a refrigerant circuit diagram of an air conditioning apparatus according to Embodiment 1.
• FIG. 1 is a perspective view schematically showing an outdoor heat exchanger of an air conditioning apparatus according to Embodiment 1.
• FIG. 1 is a perspective view showing an outdoor unit of an air conditioning apparatus according to Embodiment 1.
• FIG. 1 is a perspective view of an outdoor unit of an air conditioning apparatus according to Embodiment 1, with some of the components constituting the outdoor unit removed.
• FIG. 1 is a top view schematically showing a cross section of an outdoor unit of an air conditioning apparatus according to Embodiment 1.
• FIG. 10 is a diagram showing a schematic diagram of the state of the refrigerant inside the first header of the outdoor heat exchanger of the air conditioning apparatus according to Embodiment 1 when a gas-liquid two-phase refrigerant flows into the first header.
• FIG. 10 is a diagram showing the relationship between the flow path position and the liquid distribution flow rate when a gas-liquid two-phase refrigerant flows into the first header of the outdoor heat exchanger of the air conditioning apparatus according to embodiment 1.
• FIG. 10 is a diagram showing a schematic diagram of the state of the refrigerant inside the first header of the outdoor heat exchanger of the air conditioning apparatus according to embodiment 2 when a gas-liquid two-phase refrigerant flows into the first header.
• FIG. 10 is a diagram showing a schematic diagram of the state of the refrigerant inside the first header of the outdoor heat exchanger of the air conditioning apparatus according to embodiment 2 when a gas-liquid two-phase refrigerant flows into the first header.
• FIG. 1 is a diagram illustrating a refrigeration cycle system 1000 according to a first embodiment.
• the refrigeration cycle system 1000 is installed in a building or other structure and includes multiple air conditioning apparatuses 100A and 100B.
• the air conditioning apparatus 100A includes an outdoor unit 10A that supplies cold or hot heat to an indoor unit 20A, and an indoor unit 20A that air-conditions an indoor space R.
• the air conditioning apparatus 100B includes an outdoor unit 10B that supplies cold or hot heat to an indoor unit 20B, and an indoor unit 20B that air-conditions the indoor space R.
• the suffixes "A” and “B” will be omitted and they will be referred to as the air conditioning apparatus 100.
• the refrigeration cycle system 1000 may have three or more air conditioning devices 100. Furthermore, multiple air conditioning devices 100 may condition different indoor spaces R. Furthermore, the air conditioning device 100 is not limited to a 1:1 correspondence between the outdoor units 10 and the indoor units 20, but may be a 1:many, many:1, or many:many correspondence.
• the refrigerant circuit is formed by connecting the compressor 11, flow switching device 12, indoor heat exchanger 22, throttling device 21, right heat exchanger 30a, rear heat exchanger 30b, left heat exchanger 30c, first flow control valve 13, second flow control valve 14, and accumulator 15 via piping 90.
• the rear heat exchanger 30b is connected in parallel with the right heat exchanger 30a and left heat exchanger 30c.
• the right heat exchanger 30a is also connected in parallel with the left heat exchanger 30c.
• the flow path switching device 12 is, for example, a four-way valve, and switches between cooling operation and heating operation by switching the direction of refrigerant flow.
• the flow path switching device 12 switches to the state shown by the solid lines, described below, and connects the discharge side of the compressor 11 to the outdoor heat exchanger 30.
• the flow path switching device 12 switches to the state shown by the dashed lines, and connects the discharge side of the compressor 11 to the indoor heat exchanger 22.
• the right heat exchanger 30a, rear heat exchanger 30b, and left heat exchanger 30c are outdoor heat exchangers 30 that exchange heat between outdoor air and refrigerant.
• the right heat exchanger 30a, rear heat exchanger 30b, and left heat exchanger 30c function as condensers that radiate heat from the refrigerant to the outdoor air to condense the refrigerant.
• the right heat exchanger 30a, rear heat exchanger 30b, and left heat exchanger 30c function as evaporators that absorb heat from the outdoor air to evaporate the refrigerant. Details will be described later using Figures 4 to 6, but in embodiment 1, the right heat exchanger 30a, rear heat exchanger 30b, and left heat exchanger 30c are independent heat exchangers that are located on the right, rear, and left parts of the outdoor unit 10, respectively.
• the indoor heat exchanger 22 exchanges heat between the indoor air and the refrigerant.
• the indoor heat exchanger 22 functions as an evaporator, evaporating the refrigerant and cooling the indoor air with the heat of vaporization.
• the indoor heat exchanger 22 functions as a condenser, releasing the heat of the refrigerant into the indoor air to condense the refrigerant.
• the low-temperature, low-pressure liquid refrigerant flowing out of the right heat exchanger 30a, rear heat exchanger 30b, and left heat exchanger 30c flows into the throttling device 21, where it is decompressed, becoming a low-temperature, low-pressure, two-phase gas-liquid refrigerant, which then flows into the indoor heat exchanger 22.
• the low-temperature, low-pressure, two-phase gas-liquid refrigerant that flows into the indoor heat exchanger 22 exchanges heat with the indoor air, absorbing heat and evaporating, becoming a low-temperature, low-pressure gas refrigerant that flows out of the indoor heat exchanger 22.
• the indoor air is cooled, and the room is cooled.
• the low-temperature, low-pressure gas refrigerant flowing out of the indoor heat exchanger 22 is drawn into the compressor 11 via the flow switching device 12 and the accumulator 15, where it again becomes a high-temperature, high-pressure gas refrigerant.
• the low-temperature, low-pressure two-phase gas-liquid refrigerant flows into the right heat exchanger 30a, rear heat exchanger 30b, and left heat exchanger 30c.
• the low-temperature, low-pressure two-phase gas-liquid refrigerant that flows into the right heat exchanger 30a, rear heat exchanger 30b, and left heat exchanger 30c exchanges heat with the outdoor air, evaporating while absorbing heat, and flows out as low-temperature, low-pressure gas refrigerant.
• the low-temperature, low-pressure gas refrigerant that flows out of the right heat exchanger 30a, rear heat exchanger 30b, and left heat exchanger 30c is drawn into the compressor 11 via the flow switching device 12 and accumulator 15, where it again becomes high-temperature, high-pressure gas refrigerant.
• FIG. 3 is a perspective view that schematically shows the outdoor heat exchanger 30 of the air conditioning apparatus 100 according to embodiment 1. Note that the arrows in Figure 3 indicate the flow of refrigerant.
• the right heat exchanger 30a is a corrugated fin tube type with parallel piping.
• the right heat exchanger 30a has a first header 31, heat transfer tubes 32, corrugated fins 33, a folded header 34, and a second header 35.
• first header 31, the second header 35, and the third header are also referred to as "headers.”
• a pair of headers, consisting of the first header 31, the second header 35, and the folded header 34 are arranged above and below.
• groups of heat transfer tubes 32 hereinafter also referred to as heat transfer tube groups are arranged in two rows in the air flow direction.
• the groups of heat transfer tubes 32 are perpendicular to the first header 31, the second header 35, and the folded header 34, and are arranged parallel to each other at intervals along the side closest to the housing 40.
• the groups of heat transfer tubes 32 in each row are connected to the first header 31 or the second header 35.
• the first header 31 extends along the side closest to the housing 40 and is located below the right heat exchanger 30a.
• the first header 31 is connected to the other devices that make up the air conditioning unit 100, and is a pipe through which the refrigerant flows in and out and through which the refrigerant branches or merges.
• the first header 31 also has a single-pipe structure.
• a refrigerant inlet (not shown) is formed in the first header 31, and a refrigerant inlet pipe 36 is connected to the refrigerant inlet, through which refrigerant flows in from the outside.
• the heat transfer tubes 32 extend in the vertical direction, with their lower ends connected to the first header 31 or the second header 35 and their upper ends connected to the turn-back header 34.
• the heat transfer tubes 32 are, for example, flat tubes with a flat cross section, with the outer surface on the long side of the flat shape along the air flow direction being flat and the outer surface on the short side perpendicular to the longitudinal direction being curved.
• the heat transfer tubes 32 are, for example, multi-hole flat tubes with multiple holes inside the tube that serve as refrigerant flow paths for refrigerant flowing in the vertical direction.
• the holes in the heat transfer tubes 32 are formed facing in the vertical direction, as they serve as flow paths between the first header 31 and the second header 35 and the turn-back header 34.
• the corrugated fins 33 have a wave shape and are arranged between two adjacent heat transfer tubes 32, with multiple apexes joined to the flat surfaces of the heat transfer tubes 32.
• the right heat exchanger 30a is a corrugated fin tube type in which groups of heat transfer tubes 32 are arranged in two rows in the air flow direction, but this is not limited to this, and groups of heat transfer tubes 32 may be arranged in only one row or in three or more rows in the air flow direction.
• the second header 35 extends along the side closest to the housing 40 and is provided below the right heat exchanger 30a.
• the second header 35 is connected to the other devices that make up the air conditioning unit 100, and is a pipe through which the refrigerant flows in and out and through which the refrigerant branches or merges.
• the second header 35 also has a single-pipe structure.
• a refrigerant outlet (not shown) is formed in the second header 35, and a refrigerant outlet pipe 37 is connected to the refrigerant outlet, through which the refrigerant flows out to the outside.
• the right heat exchanger 30a is generally flat and is arranged along the right surface 40a that forms the right part of the housing 40, with almost the entire area facing the right surface 40a.
• the rear heat exchanger 30b is generally flat and is arranged along the rear surface 40b that forms the rear part of the housing 40, with almost the entire area facing the rear surface 40b.
• the left heat exchanger 30c is generally flat and is arranged along the left surface 40c that forms the left part of the housing 40, with almost the entire area facing the left surface 40c.
• Figure 6 is a top view schematically showing a cross section of the outdoor unit 10 of the air conditioning apparatus 100 according to embodiment 1.
• arrows indicate the flow of refrigerant during cooling operation.
• the portion corresponding to the first heat exchange section 30a1 of the right heat exchanger 30a is referred to as the first heat exchange section 30b1
• the portion corresponding to the second heat exchange section 30a2 of the right heat exchanger 30a is referred to as the second heat exchange section 30b2.
• the portion corresponding to the first heat exchange section 30a1 of the right heat exchanger 30a is referred to as the first heat exchange section 30c1
• the portion corresponding to the second heat exchange section 30a2 of the right heat exchanger 30a is referred to as the second heat exchange section 30c2.
• the right heat exchanger 30a, rear heat exchanger 30b, and left heat exchanger 30c are each positioned so that their refrigerant inlets are inside the housing 40 and on the downwind side in the air flow direction, and their refrigerant outlets are outside the housing 40 and on the upwind side in the air flow direction.
• the right heat exchanger 30a has a first header 31 connected to a refrigerant inlet pipe 36 through which refrigerant flows from the outside, located at the bottom of the group of heat transfer tubes 32 that is upstream of the two rows of heat transfer tubes 32.
• the compressor 11 and accumulator 15 are positioned in a region (hereinafter also referred to as the upstream refrigerant flow region) that faces within the upstream three-quarters of the refrigerant flow of the first header 31 of the right heat exchanger 30a, which is the closest heat exchanger among the multiple heat exchangers, in a plan view.
• the compressor 11 and accumulator 15 are arranged in a region between the upstream end of the refrigerant flow in the first header 31 of the right heat exchanger 30a and the upstream 3/4 of the refrigerant flow (see the upstream 3/4 region boundary line in Figure 6) in a plan view.
• Figure 7 is a diagram showing the state of the internal refrigerant when two-phase gas-liquid refrigerant flows into the first header 31 of the outdoor heat exchanger 30 of the air conditioning apparatus 100 according to embodiment 1.
• Figure 8 is a diagram showing the relationship between the flow path position and the liquid distribution flow rate when two-phase gas-liquid refrigerant flows into the first header 31 of the outdoor heat exchanger 30 of the air conditioning apparatus 100 according to embodiment 1.
• the compressor 11 and accumulator 15, which occupy a large volume are positioned in an area facing the upstream three-quarters of the refrigerant flow in the header of the closest heat exchanger among the multiple heat exchangers in plan view. This makes it possible to bring the air velocity distribution closer to the liquid distribution in the header, thereby improving heat exchange performance.
• an air velocity distribution occurs in the outdoor heat exchanger 30 within the housing 40, and the air velocity slows in the area facing the compressor 11 and accumulator 15, which occupy a large volume. If the compressor 11 and accumulator 15, which occupy a large volume, are placed in an area where the liquid distribution flow rate is high and a larger heat exchange volume is expected, the air velocity will slow in the area where the liquid refrigerant distribution volume is high and the air velocity will increase in the area where the liquid refrigerant distribution volume is low, resulting in reduced heat exchange performance.
• the compressor 11 and accumulator 15, which occupy a large volume, are placed in the upstream refrigerant flow area where the liquid distribution flow rate is low and a large heat exchange volume is not expected, and they are not placed in the area where the liquid distribution flow rate is high and a larger heat exchange volume is expected, thereby ensuring a high air velocity.
• This increases the air velocity in the area where the liquid refrigerant distribution volume is high and decreases the air velocity in the area where the liquid refrigerant distribution volume is low, thereby improving heat exchange performance.
• the outdoor unit 10 of the air conditioning apparatus 100 is an outdoor unit 10 of a top-flow type air conditioning apparatus 100 comprising a box-shaped housing 40 forming the outer shell, a plurality of heat exchangers arranged along different sides of the housing 40, a compressor 11 arranged on the bottom of the housing 40, and an outdoor fan 50 arranged on the top of the housing 40, wherein the plurality of heat exchangers each extend in the vertical direction and are arranged at intervals in a direction along the nearest side, and comprise a plurality of heat transfer tubes 32 through which a refrigerant flows; at least one group of heat transfer tubes arranged at intervals in an air flow direction perpendicular to the direction along the nearest side; and a header provided below the most downstream group of heat transfer tubes arranged furthest downstream in the air flow direction, among the at least one group of heat transfer tubes, and having a refrigerant inlet through which refrigerant flows from outside; and the compressor 11 is arranged in an area facing within the upstream three-quarter
• a top-flow type air conditioner 100 has multiple heat exchangers arranged along different sides of the housing 40, with refrigerant flowing vertically through heat transfer tubes 32.
• the compressor 11 is arranged, in plan view, in an area facing the upstream three-quarters of the refrigerant flow in the header of the heat exchanger that is closest to the multiple heat exchangers.
• compressors 11 with large occupying volumes are arranged in areas where the liquid distribution flow rate is low and a large heat exchange volume cannot be expected, and compressors 11 with large occupying volumes are not arranged in areas where the liquid distribution flow rate is high and a larger heat exchange volume can be expected, thereby ensuring a high air speed.
• This increases the air speed in areas where the liquid refrigerant distribution volume is high and decreases the air speed in areas where the liquid refrigerant distribution volume is low, thereby improving heat exchange performance.
• the outdoor unit 10 of the air conditioning apparatus 100 is equipped with an accumulator 15 disposed on the bottom surface of the housing 40, and the accumulator 15 is disposed in an area facing, in plan view, within the upstream three-quarters of the refrigerant flow in the header of the heat exchanger that is closest to it among the multiple heat exchangers.
• a top-flow type air conditioner 100 has multiple heat exchangers arranged along different sides of the housing 40, with refrigerant flowing vertically through heat transfer tubes 32.
• the accumulator 15 is arranged, in plan view, in an area facing the upstream three-quarters of the refrigerant flow in the header of the heat exchanger that is closest to the multiple heat exchangers.
• accumulators 15 with large occupying volumes are arranged in areas where the liquid distribution flow rate is low and a large heat exchange volume cannot be expected, and accumulators 15 with large occupying volumes are not arranged in areas where the liquid distribution flow rate is high and a larger heat exchange volume can be expected, thereby ensuring a high air velocity. This increases the air velocity in areas where the liquid refrigerant distribution volume is high and decreases the air velocity in areas where the liquid refrigerant distribution volume is low, thereby improving heat exchange performance.
• the air conditioning apparatus 100 according to embodiment 1 is equipped with the outdoor unit 10 of the air conditioning apparatus 100 described above.
• the air conditioning apparatus 100 according to embodiment 1 can achieve the same effects as the outdoor unit 10 of the air conditioning apparatus 100 described above.
• Embodiment 2 Hereinafter, the second embodiment will be described, but explanations of parts that overlap with the first embodiment will be omitted, and parts that are the same as or equivalent to the first embodiment will be given the same reference numerals. In addition, the second embodiment will be described mainly with respect to differences from the first embodiment.
• Figure 9 is a diagram schematically showing the state of the refrigerant inside the outdoor heat exchanger 30 of the air conditioning apparatus 100 according to embodiment 2 when two-phase gas-liquid refrigerant flows into the first header 31A.
• Figure 10 is a diagram showing the relationship between the flow path position and the liquid distribution flow rate when two-phase gas-liquid refrigerant flows into the first header 31A of the outdoor heat exchanger 30 of the air conditioning apparatus 100 according to embodiment 2.
• Figure 11 is a top view schematically showing a cross section of the outdoor unit 10 of the air conditioning apparatus 100 according to embodiment 2.
• the first header 31A has a double-pipe structure having an inner pipe 71 and an outer pipe 72.
• the inner pipe 71 and outer pipe 72 extend in a direction (hereinafter also referred to as the extension direction) along the side closest to the housing 40, and the inner pipe 71 is inserted inside the outer pipe 72.
• the inner pipe 71 and outer pipe 72 are joined by brazing.
• the inner pipe 71 is, for example, a circular pipe and is connected to the refrigerant inlet pipe 36.
• the inner pipe 71 and the refrigerant inlet pipe 36 may be formed integrally.
• the inner pipe 71 has multiple orifices 73 formed at intervals in the extension direction through which the refrigerant flows. By forming multiple orifices 73 in this way in the inner pipe 71, when the outdoor heat exchanger 30 functions as an evaporator, the two-phase gas-liquid refrigerant that flows into the inner pipe 71 of the first header 31A via the refrigerant inlet pipe 36 passes through the multiple orifices 73 and flows into the space between the outer peripheral surface of the inner pipe 71 and the inner peripheral surface of the outer pipe 72. The two-phase gas-liquid refrigerant that flows out into the space between the outer peripheral surface of the inner pipe 71 and the inner peripheral surface of the outer pipe 72 then flows into each heat transfer pipe 32.
• the liquid distribution flow rate increases from the upstream 5/6 of the first header 31A, to which the refrigerant inlet pipe 36 through which external refrigerant flows, toward the downstream side (see arrow B in Figure 10).
• the first header 31A has an inner pipe 71 and an outer pipe 72, and a double-pipe structure with multiple orifices 73 formed in the inner pipe 71. This reduces the bias of liquid refrigerant toward the downstream side of the first header 31 compared to the single-pipe structure of embodiment 1, improving distribution performance.
• the outdoor unit 10 of the air conditioning apparatus 100 is an outdoor unit 10 of a top-flow type air conditioning apparatus 100 that includes a box-shaped housing 40 that forms the outer shell, a plurality of heat exchangers arranged along different sides of the housing 40, a compressor 11 arranged on the bottom surface of the housing 40, and an outdoor fan 50 arranged on the top of the housing 40, and the plurality of heat exchangers each extend in the vertical direction, are arranged at intervals in a direction along the nearest side, and consist of a plurality of heat transfer tubes 32 through which a refrigerant flows, and are arranged in an air flow direction perpendicular to the direction along the nearest side.
• the system comprises at least one heat transfer tube group arranged at intervals, and a header located below the most downstream heat transfer tube group of the at least one heat transfer tube group arranged furthest downstream in the air flow direction, and having a refrigerant inlet formed therein through which refrigerant flows from the outside.
• the header has a double-tube structure with an inner tube 71 having multiple orifices 73 formed at intervals in the extension direction, and the compressor 11 is located in an area facing within the upstream 5/6 of the refrigerant flow portion of the header of the heat exchanger that is closest to it among the multiple heat exchangers, in a plan view.
• the outdoor unit 10 of the air conditioner 100 is a top-flow type air conditioner 100 having multiple heat exchangers arranged along different sides of the housing 40, with refrigerant flowing vertically through the heat transfer tubes 32.
• the header has a double-pipe structure with an inner tube 71 having multiple orifices 73 spaced apart in the extension direction.
• the compressor 11 is located in a region facing the upstream 5/6 of the refrigerant flow in the header of the heat exchanger closest to it in plan view.
• a compressor 11 with a large volume is located in a region where the liquid distribution flow rate is low and a large heat exchange volume cannot be expected, while a compressor 11 with a large volume is not located in a region where the liquid distribution flow rate is high and a larger heat exchange volume can be expected, thereby ensuring a high airflow speed.
• This increases the airflow speed in regions where a large amount of liquid refrigerant is distributed and decreases the airflow speed in regions where a small amount of liquid refrigerant is distributed, thereby improving heat exchange performance. It also increases the flexibility in the placement of the compressor 11 with a large volume.
• the air conditioning apparatus 100 includes an accumulator 15 disposed on the bottom surface of the housing 40, and the accumulator 15 is disposed in a region facing, in plan view, within the upstream 5/6 of the refrigerant flow of the header of the heat exchanger that is closest among the multiple heat exchange units.
• a top-flow type air conditioner 100 has multiple heat exchangers arranged along different sides of the housing 40, with refrigerant flowing vertically through heat transfer tubes 32.
• the header has a double-pipe structure with an inner tube 71 having multiple orifices 73 spaced apart in the extension direction.
• the accumulator 15 is located in a region facing the upstream 5/6 of the refrigerant flow in the header of the heat exchanger closest to it in plan view. In other words, accumulators 15 with large volumes are located in regions where the liquid distribution flow rate is low and a large heat exchange volume cannot be expected.
• Accumulators 15 with large volumes are not located in regions where the liquid distribution flow rate is high and a larger heat exchange volume can be expected, ensuring a high airflow speed. This increases the airflow speed in regions where the liquid refrigerant distribution volume is high and decreases the airflow speed in regions where the liquid refrigerant distribution volume is low, thereby improving heat exchange performance. It also improves the flexibility of placement of the accumulator 15, which occupies a large volume.
• the air conditioning apparatus 100 according to embodiment 2 is equipped with the outdoor unit 10 of the air conditioning apparatus 100 described above.
• the air conditioning apparatus 100 according to embodiment 2 can achieve the same effects as the outdoor unit 10 of the air conditioning apparatus 100 described above.

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  • 2024-02-28 WO PCT/JP2024/007353 patent/WO2025181955A1/ja active Pending

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