EP4737809A1 - Heat exchange unit and air conditioning device - Google Patents

Heat exchange unit and air conditioning device

Info

Publication number
EP4737809A1
EP4737809A1 EP25842576.8A EP25842576A EP4737809A1 EP 4737809 A1 EP4737809 A1 EP 4737809A1 EP 25842576 A EP25842576 A EP 25842576A EP 4737809 A1 EP4737809 A1 EP 4737809A1
Authority
EP
European Patent Office
Prior art keywords
cross
guide panel
flow fan
inclination angle
guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP25842576.8A
Other languages
German (de)
French (fr)
Inventor
designation of the inventor has not yet been filed The
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP4737809A1 publication Critical patent/EP4737809A1/en
Pending legal-status Critical Current

Links

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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0025—Cross-flow or tangential fans
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2130/00—Control inputs relating to environmental factors not covered by group F24F2110/00
    • F24F2130/20—Sunlight

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)

Abstract

In an indoor unit (7), a cross-flow fan (70) is disposed at a position corresponding to an inlet port (52) in a casing (50). The inlet port includes a first region (A1) overlapping the cross-flow fan in front view and a second region (A2) located on a side closer to a tongue portion (63) provided in the casing relative to the first region. Among a plurality of guide panels provided in the inlet port, a first guide panel (92a) closest to the center of the cross-flow fan in the first region is in an orientation extending upward toward the cross-flow fan, and a second guide panel (92b) located in the second region is provided in an orientation extending downward toward the cross-flow fan.

Description

    TECHNICAL FIELD
  • The present disclosure relates to a heat exchange unit and an air conditioning apparatus.
    • BACKGROUND ART
  • Patent Document 1 discloses a heat exchange unit including a cross-flow fan and a heat exchanger. The cross-flow fan and the heat exchanger are housed in a casing. An inlet port is formed in a lower portion of the front surface of the casing, and an outlet port is formed in the upper surface of the casing. An air passage extending from the inlet port to the outlet port is provided in the casing. The cross-flow fan is disposed at a position corresponding to the inlet port of the air passage. The heat exchanger is disposed downstream of the cross-flow fan in the air passage.
    • CITATION LIST PATENT DOCUMENT
  • Patent Document 1: Japanese Utility Model Publication No. H3-127137
    • SUMMARY OF THE INVENTION TECHNICAL PROBLEM
  • In the heat exchange unit such as one described above, the inlet port is provided with a plurality of guide panels spaced apart from each other in an up-down direction, which guide the air sucked into the air passage by operation of the cross-flow fan. In the heat exchange unit, it is conceivable to provide the cross-flow fan in the vicinity of the inlet port, orient the guide panel located at a position close to the cross-flow fan such that the air is guided in a direction opposite to the rotation direction of the cross-flow fan, and impart pre-whirl to the flow of air to be sucked into the cross-flow fan, thereby increasing the pressure produced by the cross-flow fan.
  • In the heat exchange unit, the up-down width of the inlet port is made greater than the diameter of the cross-flow fan, thereby ensuring the flow rate of air sucked into the air passage. Accordingly, the air can be efficiently circulated through the air passage by the operation of the cross-flow fan. In this case, the plurality of guide panels is disposed over the entire opening surface of the inlet port. Thus, the guide panels are also provided at positions not overlapping the cross-flow fan in front view. In the configuration in which all the guide panels are provided at the inlet port in a uniform orientation that imparts pre-whirl, the following specific problems are caused.
  • As illustrated in FIG. 15, when an inlet port (52a) is greater than the diameter of a cross-flow fan (70), and a plurality of guide panels (92) is in a uniform orientation, the air guided by the guide panels (92) closer to the upper edge of the inlet port (52a), which are at positions not overlapping the cross-flow fan (70) in front view, flows outward in the radial direction of the cross-flow fan (70), beside a tongue portion (63) forming a wall surface of an air passage (56) provided along part of the outer periphery of the cross-flow fan (70), and is then sucked into the cross-flow fan (70). Thus, the air guided by the guide panels (92) closer to the upper edge of the inlet port (52a) has a long path to the cross-flow fan (70), which causes the loss in the cross-flow fan (70).
  • It is an object of the present disclosure to reduce the loss in a cross-flow fan in a heat exchange unit in which pre-whirl is generated by a guide panel provided in an inlet port.
    • SOLUTION TO THE PROBLEM
  • A first aspect of the present disclosure is directed to a heat exchange unit (7). The heat exchange unit (7) includes: a casing (50) having an inlet port (52), an outlet port (54), and an air passage (56) allowing the inlet port (52) and the outlet port (54) to communicate with each other; a cross-flow fan (70) housed in the air passage (56); and a heat exchanger (80) disposed downstream of the cross-flow fan (70) in the air passage (56). The cross-flow fan (70) is disposed at a position corresponding to the inlet port (52) in a first direction orthogonal to an opening surface of the inlet port (52), the cross-flow fan (70) being configured to rotate about an axis (Ra) extending along a second direction orthogonal to the first direction. The casing (50) is provided with a tongue portion (63) forming a wall surface of the air passage (56) along part of an outer periphery of the cross-flow fan (70) on one side of the cross-flow fan (70) in a third direction orthogonal to the first direction and the second direction. The inlet port (52) includes a first region (A1) overlapping the cross-flow fan (70) when viewed in the first direction, and a second region (A2) located on a side closer to the tongue portion (63) in the third direction relative to the first region (A1). The inlet port (52) is provided with a plurality of guide panels (92), each extending in the second direction and spaced apart from each other in the third direction. The plurality of guide panels (92) includes a first guide panel (92a) located closest to a center (C1) of the cross-flow fan (70) in the first region (A1) and a second guide panel (92b) located in the second region (A2). In a cross section orthogonal to the second direction, for each guide panel (92), a straight line passing through a center (C2) of the guide panel (92) and the center (C1) of the cross-flow fan (70) is defined as a first straight line (L1); for each guide panel (92), a straight line passing through an upstream end of the guide panel (92) on an upstream side in an air flow direction and a downstream end of the guide panel (92) on a downstream side in the air flow direction is defined as a second straight line (L2); among intersections, each between an outer peripheral surface (70a) of the cross-flow fan (70) and the first straight line (L1), an intersection closer to the inlet port (52) is defined as a first intersection (P1); and among intersections, each between the outer peripheral surface (70a) of the cross-flow fan (70) and the second straight line (L2), an intersection closer to the inlet port (52) is defined as a second intersection (P2), and under these definitions, the first guide panel (92a) is provided in an orientation inclined with respect to the first direction such that the second intersection (P2) is located on a trailing side in a rotation direction of the cross-flow fan (70) relative to the first intersection (P1). The second guide panel (92b) is provided in an orientation in which a second inclination angle formed by the second straight line (L2) of the second guide panel (92b) with respect to the first direction is smaller than a first inclination angle formed by the second straight line (L2) of the first guide panel (92a) with respect to the first direction, or in an orientation in which the second inclination angle is formed with respect to the first direction on a side opposite to a side on which the first guide panel (92a) forms the first inclination angle.
  • According to the first aspect, the inlet port (52) has the first region (A1) corresponding to the cross-flow fan (70) when viewed in the first direction, and the second region (A2) located on the side closer to the tongue portion (63) in the third direction relative to the first region (A1). Among the plurality of guide panels (92) arranged at the inlet port (52), the first guide panel (92a) located closest to the center (C1) of the cross-flow fan (70) in the first region (A1) is provided in an orientation inclined with respect to the first direction. The first guide panel (92a) is oriented such that in the cross section orthogonal to the second direction, the second intersection (P2) close to the inlet port (52) among intersections between the outer peripheral surface (70a) of the cross-flow fan (70) and the second straight lines (L2) is located on the trailing side in the rotation direction of the cross-flow fan (70) relative to the first intersection (P1) close to the inlet port (52) among intersections between the outer peripheral surface of the cross-flow fan (70) and the first straight lines (L1). The first guide panel (92a) can impart pre-whirl to the flow of air sucked into the cross-flow fan (70) in the direction opposite to the rotation direction of the cross-flow fan (70), thereby increasing the pressure of the cross-flow fan (70). Further, among the plurality of guide panels (92), the second guide panel (92b) located in the second region (A2) is provided in a different orientation from the orientation of the first guide panel (92a). The second guide panel (92b) is provided in an orientation in which a second inclination angle formed by the second straight line (L2) of the second guide panel (92b) with respect to the first direction is smaller than a first inclination angle formed by the second straight line (L2) of the first guide panel (92a) with respect to the first direction, or in an orientation in which the second inclination angle is formed with respect to the first direction on a side opposite to a side on which the first guide panel (92a) forms the first inclination angle. According to this configuration, the air guided by the second guide panel (92b) when passing through the inlet port (52) and sucked into the air passage (56) can flow smoothly toward the cross-flow fan (70), as compared to a case in which the second guide panel (92b) is in the same orientation as that of the first guide panel (92a). Accordingly, the loss in the cross-flow fan (70) can be reduced.
  • A second aspect of the present disclosure is an embodiment of the heat exchange unit (7) of the first aspect. In the second aspect, the plurality of guide panels (92) includes, in the first region (A1), a third guide panel (92c) located between the first guide panel (92a) and the second guide panel (92b). The third guide panel (92c) is provided in an orientation in which a third inclination angle formed by the second straight line (L2) of the third guide panel (92c) with respect to the first direction is an angle between the first inclination angle and the second inclination angle.
  • According to the second aspect, among the plurality of guide panels (92), the third guide panel (92c) located between the first guide panel (92a) and the second guide panels (92b) is provided in a different orientation from the orientations of the first guide panel (92a) and the second guide panel (92b). The third guide panel (92c) is provided in an orientation in which a third inclination angle formed by the second straight line (L2) of the third guide panel (92c) with respect to the first direction is an angle between the first inclination angle and the second inclination angle. The third guide panel (92c) can reduce significant changes in orientation of the plurality of guide panels (92) between the first guide panel (92a) and the second guide panel (92b). This makes it possible to mitigate collision of flow of the air guided by adjacent guide panels (92) when the air passes through the inlet port (52). This is advantageous in reducing the loss in the cross-flow fan (70).
  • A third aspect of the present disclosure is an embodiment of the heat exchange unit (7) of the first or second aspect. In the third aspect, the air passage (56) includes a suction space (56a) provided between the inlet port (52) and the cross-flow fan (70). The suction space (56a) corresponds to the second region (A2) in the first direction and extends so as to correspond to a portion of the cross-flow fan (70) closer to the inlet port (52) in the third direction.
  • According to the third aspect, the suction space (56a) in the casing (50) corresponds to the second region (A2) in the first direction and extends so as to correspond to a portion of the cross-flow fan (70) closer to the inlet port (52) in the third direction. Such a suction space (56a) included in the air passage (56) allows the inlet port (52) to have a wide opening area; however, when the second guide panel (92b) has the same orientation as that of the first guide panel (92a), the second guide panel (92b) guides the air passing through the inlet port (52) outward in the radial direction of the cross-flow fan (70), and the loss in the cross-flow fan (70) tends to increase. Thus, the technique of the present disclosure is particularly effective in this heat exchange unit (7).
  • A fourth aspect of the present disclosure is an embodiment of the heat exchange unit (7) of any one of the first to third aspects. In the fourth aspect, the third direction corresponds to an up-down direction. The cross-flow fan (70) rotates such that a blade (76) of the cross-flow fan (70) rotates from an upper side to a lower side on a side closer to the inlet port (52). The first guide panel (92a) is inclined with respect to the first direction such that the second straight line (L2) extends upward toward the cross-flow fan (70). The second guide panel (92b) is located higher than the first guide panel (92a), and is inclined with respect to the first direction such that the second straight line (L2) extends downward toward the cross-flow fan (70), or is in an orientation in which the second straight line (L2) is parallel to the first direction.
  • A fifth aspect of the present disclosure is an embodiment of the heat exchange unit (7) of any one of the first to fourth aspects. In the fifth aspect, the first inclination angle θ1 satisfies 0° ≤ θ1 ≤ 60°.
  • According to the fifth aspect, the first inclination angle θ1 formed by the second straight line (L2) of the first guide panel (92a) with respect to the first direction is 0° or more and 60° or less. When the first inclination angle θ1 is 60° or less, pre-whirl can be suitably imparted to the flow of air sucked into the cross-flow fan (70), while suppressing an excessive increase in resistance (air flow resistance) when the air passes through the inlet port.
  • A sixth aspect of the present disclosure is an embodiment of the heat exchange unit (7) of any one of the first to fifth aspects. In the sixth aspect, the second guide panel (92b) is in an orientation in which the second inclination angle is formed with respect to the first direction on a side opposite to a side on which the first guide panel (92a) forms the first inclination angle. The second inclination angle θ2 satisfies 0° ≤ 02 ≤ 45°.
  • According to the sixth aspect, the second guide panel (92b) is inclined, with respect to the first direction, toward a side opposite to the side toward which the first guide panel (92a) is inclined, and the second inclination angle θ2 formed by the second straight line (L2) of the second guide panel (92b) with respect to the first direction is 0° or more and 45° or less. When the second inclination angle θ2 is 45° or less, the air passing through the inlet port (52) can be guided toward the cross-flow fan (70) by the second guide panel (92b), while suppressing an excessive increase in resistance (air flow resistance) when the air passes through the inlet port (52).
  • A seventh aspect of the present disclosure is an embodiment of the heat exchange unit (7) of any one of the first to sixth aspects. In the seventh aspect, the plurality of guide panels (92) includes a plurality of fourth guide panels (92d) disposed on an opposite side from the second guide panel (92b) relative to the first guide panel (92a). Each of the plurality of fourth guide panels (92d) is provided in an orientation in which a fourth inclination angle formed by the second straight line (L2) of the fourth guide panel (92d) with respect to the first direction is greater than the first inclination angle. The fourth inclination angle increases as a distance between the fourth guide panel (92d) forming the fourth inclination angle and the first guide panel (92a) increases.
  • According to the seventh aspect, among the plurality of guide panels (92), each of the fourth guide panels (92d) is provided in an orientation in which a fourth inclination angle formed by the second straight line (L2) with respect to the first direction is greater than the first inclination angle. The fourth guide panels (92d) are guide panels (92) disposed on a side opposite to the second guide panel (92b) relative to the first guide panel (92a), and form the fourth inclination angles that increase as the distance from the first guide panel (92a) increases. The fourth guide panels (92d) can reduce significant changes in orientation of the plurality of guide panels (92) on the side opposite to the second guide panel (92b) relative to the first guide panel (92a). This makes it possible to mitigate collision of flow of the air guided by adjacent guide panels (92) when the air passes through the inlet port (52). This is advantageous in reducing the loss in the cross-flow fan (70).
  • An eighth aspect of the present disclosure is directed to an air conditioning apparatus (1). The air conditioning apparatus (1) includes the heat exchange unit (7) of any one of the first to seventh aspects.
  • According to the eighth aspect, the air conditioning apparatus (1) includes the heat exchange unit (7). The heat exchange unit (7) can reduce the loss in the cross-flow fan (70). It is thus possible to enhance the energy-saving performance of the air conditioning apparatus (1).
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • [FIG. 1] FIG. 1 is a schematic configuration diagram of an air conditioning apparatus of an embodiment.
    • [FIG. 2] FIG. 2 is a schematic front view of an indoor unit.
    • [FIG. 3] FIG. 3 is a cross-sectional view of the indoor unit taken along line III-III in FIG. 2.
    • [FIG. 4] FIG. 4 is a perspective view of a fan rotor of a cross-flow fan.
    • [FIG. 5] FIG. 5 is a front view of a main part of the indoor unit indicated by V in FIG. 2.
    • [FIG. 6] FIG. 6 is a cross-sectional view of a main part of the indoor unit indicated by VI in FIG. 3.
    • [FIG. 7] FIG. 7 is a cross-sectional view illustrating a main part of an indoor unit of Comparative Example 1.
    • [FIG. 8] FIG. 8 is a cross-sectional view illustrating a main part of an indoor unit of Comparative Example 2.
    • [FIG. 9] FIG. 9 is a cross-sectional view illustrating a main part of an indoor unit of Comparative Example 3.
    • [FIG. 10] FIG. 10 is a table showing the specifications of guide panels of Example and Comparative Examples 1 to 3 and the rotational speed at the same air flow rate.
    • [FIG. 11] FIG. 11 is a cross-sectional view illustrating, as an example, the flow of air in the main part of the indoor unit.
    • [FIG. 12] FIG. 12 is a cross-sectional view of a main part of an indoor unit of a first variation, which corresponds to FIG. 6.
    • [FIG. 13] FIG. 13 is a cross-sectional view of a main part of an indoor unit of a second variation, which corresponds to FIG. 6.
    • [FIG. 14] FIG. 14 is a cross-sectional view of a main part of an indoor unit of another embodiment, which corresponds to FIG. 6.
    • [FIG. 15] FIG. 15 is a cross-sectional view illustrating, as an example, the flow of air in the main part of the indoor unit when all guide panels incline upward toward the deeper side with respect to the horizontal direction.
    DESCRIPTION OF EMBODIMENTS
  • Exemplary embodiments will be described in detail below with reference to the drawings. In the following embodiments, a case in which a heat exchange unit according to the present disclosure is applied to an air conditioning apparatus will be described as an example. The drawings are used for conceptual description of the technique of the present disclosure. In the drawings, dimensions, ratios, or numbers may be exaggerated or simplified for easy understanding of the present disclosure.
    • -Configuration of Air Conditioning Apparatus-
  • The heat exchange unit of this embodiment is used in an air conditioning apparatus (1). The air conditioning apparatus (1) includes a heat pump type cooling/heating hot water supply system. As illustrated in FIG. 1, the air conditioning apparatus (1) includes an outdoor unit (3), a hot water supply unit (5), and an indoor unit (7). The indoor unit (7) is an example of the heat exchange unit. The outdoor unit (3) is installed outdoors. Each of the hot water supply unit (5) and the indoor unit (7) is installed indoors.
    • <Outdoor Unit>
  • The outdoor unit (3) heats or cools water, and supplies the heated or cooled water to the hot water supply unit (5) or the indoor unit (7). The outdoor unit (3) includes a refrigerant circuit (10) and an outdoor fan (12). The outdoor unit (3) further includes a casing (not illustrated). The casing houses the entirety of the refrigerant circuit (10) which is a closed circuit. The casing houses the outdoor fan (12) and devices forming the refrigerant circuit (10), such as a compressor (14), an outdoor heat exchanger (16), an expansion valve (18), and a water heat exchanger (20).
  • The refrigerant circuit (10) performs a refrigeration cycle. The refrigerant circuit (10) is filled with a refrigerant. For example, the refrigerant of the refrigerant circuit (10) is hydrofluorocarbon (HFC) refrigerant, hydrofluoro-olefin (HFO) refrigerant, a refrigerant mixture of the HFC refrigerant and the HFO refrigerant, trifluoroiodomethane (CF3I) refrigerant, carbon dioxide refrigerant, hydrocarbon refrigerant, or natural refrigerant such as propane (R290) or ammonia (R717).
  • The refrigerant circuit (10) includes, as main devices, the compressor (14), the outdoor heat exchanger (16), the expansion valve (18), and the water heat exchanger (20). The refrigerant circuit (10) further includes a four-way switching valve (22) and an accumulator (24). The compressor (14) and the four-way switching valve (22), the four-way switching valve (22) and the water heat exchanger (20), the water heat exchanger (20) and the expansion valve (18), the expansion valve (18) and the outdoor heat exchanger (16), the outdoor heat exchanger (16) and the four-way switching valve (22), the four-way switching valve (22) and the accumulator (24), and the accumulator (24) and the compressor (14) are connected to each other through refrigerant pipes (26).
  • The compressor (14) compresses the refrigerant. The compressor (14) is configured to have a variable capacity by inverter control. The accumulator (24) stores liquid contained in the refrigerant to be sucked into the compressor (14). The outdoor heat exchanger (16) exchanges heat between the refrigerant flowing therethrough and outdoor air. The refrigerant of the refrigerant circuit (10) flows through the outdoor heat exchanger (16). The outdoor fan (12) generates the flow of air, and transfers the air that passes through the outdoor heat exchanger (16). For example, the outdoor fan (12) is a propeller fan. The expansion valve (18) decompresses the refrigerant. The water heat exchanger (20) exchanges heat between the refrigerant of the refrigerant circuit (10) and water in a water circuit (30).
  • The four-way switching valve (22) switches the direction of circulation of the refrigerant in the refrigerant circuit (10). The four-way switching valve (22) has a first port (22a), a second port (22b), a third port (22c), and a fourth port (22d). The first port (22a) is connected to the discharge side of the compressor (14). The second port (22b) is connected to the outdoor heat exchanger (16). The third port (22c) is connected to the water heat exchanger (20). The fourth port (22d) is connected to the suction side of the compressor (14) via the accumulator (24). The four-way switching valve (22) switches between a first state (state indicated by a solid line in FIG. 1) and a second state (state indicated by a broken line in FIG. 1).
  • The four-way switching valve (22) in the first state allows the first port (22a) and the third port (22c) to communicate with each other, and allows the second port (22b) and the fourth port (22d) to communicate with each other. The four-way switching valve (22) in the second state allows the first port (22a) and the second port (22b) to communicate with each other, and allows the third port (22c) and the fourth port (22d) to communicate with each other. When the four-way switching valve (22) is in the first state, the refrigerant of the refrigerant circuit (10) flows in the direction of an arrow indicated by a solid line in FIG. 1; the outdoor heat exchanger (16) functions as an evaporator; and the water heat exchanger (20) functions as a radiator. When the four-way switching valve (22) is in the second state, the refrigerant of the refrigerant circuit (10) flows in the direction of an arrow indicated by a broken line in FIG. 1; the outdoor heat exchanger (16) functions as a radiator; and the water heat exchanger (20) functions as an evaporator.
    • <Hot Water Supply Unit>
  • The hot water supply unit (5) stores water heated by the outdoor unit (3). The hot water supply unit (5) is configured to include the water circuit (30). The water heat exchanger (20) and an indoor heat exchanger (80) are connected to the water circuit (30). The water circuit (30) includes the water heat exchanger (20), a pump (32), a three-way valve (34), a first check valve (36), a second check valve (38), a water storage tank (40), and the indoor heat exchanger (80). The water heat exchanger (20) and the three-way valve (34), the three-way valve (34) and the water storage tank (40), the water storage tank (40) and the pump (32), the pump (32) and the water heat exchanger (20), the three-way valve (34) and the indoor heat exchanger (80), and the indoor heat exchanger (80) and the water storage tank (40) are connected to each other through water pipes (42).
  • The water storage tank (40) is a container that stores water. The water storage tank (40) has a heat storage member (not illustrated). The heat storage member is fixed inside the water storage tank (40), and is located in the water stored in the water storage tank (40). The water storage tank (40) is provided with a hot water supply heat transfer tube (44). A water supply source, such as a public water supply system, is connected to the inlet of the hot water supply heat transfer tube (44) through a water supply pipe (46). A hot water supply device is connected to the outlet of the hot water supply heat transfer tube (44) through a hot water supply pipe (48).
  • The hot water supply device is a faucet or a shower valve capable of supplying hot water in a building. Water sent from the water supply source to the water storage tank (40) through the water supply pipe (46) is sent to the hot water supply device through the hot water supply heat transfer tube (44) and the hot water supply pipe (48). At this moment, the water passing through the hot water supply heat transfer tube (44) exchanges heat with the high-temperature water in the water storage tank (40) and the heat storage member, and turns into heated water of about 40°C to 50°C. In the hot water supply device, the hot-water supply temperature is adjusted using a mixing valve or the like.
  • The pump (32) sends out the sucked water to the water heat exchanger (20) to circulate the water in the water circuit (30). The first check valve (36) and the second check valve (38) are provided in the water pipe (42) connecting the water storage tank (40) and the indoor heat exchanger (80). The water pipe (42) connecting the water storage tank (40) and the indoor heat exchanger (80) forms a branch pipe (43) in which three water pipes (42) are joined. The suction side of the pump (32) is connected to a portion of the branch pipe (43) between the first check valve (36) and the second check valve (38).
  • The first check valve (36) is arranged on the side closer to the indoor heat exchanger (80) relative to the branch position of the branch pipe (43). The second check valve (38) is arranged on the side closer to the water storage tank (40) relative to the branch position of the branch pipe (43). The first check valve (36) allows water to flow from the indoor heat exchanger (80) side to the pump (32) in the branch pipe (43), and prevents water from flowing in the opposite direction. The second check valve (38) allows water to flow from the water storage tank (40) to the pump (32) in the branch pipe (43), and prevents water from flowing in the opposite direction. The three-way valve (34) switches the circulation path of water in the water circuit (30). The three-way valve (34) switches between a first state and a second state.
  • The first state of the three-way valve (34) is a state of allowing water to flow between the water heat exchanger (20) and the indoor heat exchanger (80). The second state of the three-way valve (34) is a state of allowing water to flow between the water heat exchanger (20) and the water storage tank (40). When the three-way valve (34) is in the first state, water discharged from the pump (32) sequentially flows through the three-way valve (34), the indoor heat exchanger (80), and the first check valve (36) and is sucked into the pump (32) again, as indicated by a solid line in FIG. 1. When the three-way valve (34) is in the second state, water discharged from the pump (32) sequentially flows through the three-way valve (34), the water storage tank (40), and the second check valve (38) and is sucked into the pump (32) again, as indicated by a broken line in FIG. 1.
    • <Indoor Unit>
  • The indoor unit (7) cools or heats an indoor space using the heat of water supplied by the water circuit (30). The indoor unit (7) is a fan coil unit. The indoor unit (7) includes a cross-flow fan (70) as an indoor fan, and the indoor heat exchanger (80). The indoor unit (7) further includes a casing (50) (not illustrated in FIG. 1). The casing (50) houses the cross-flow fan (70) and the indoor heat exchanger (80).
  • The indoor heat exchanger (80) exchanges heat between water flowing therethrough and indoor air. The water of the water circuit (30) flows through the indoor heat exchanger (80). The cross-flow fan (70) generates the flow of air and transfers the air that passes through the indoor heat exchanger (80). When low-temperature water cooled by the water heat exchanger (20) is sent to the indoor heat exchanger (80), the air transferred by the cross-flow fan (70) is cooled in the indoor heat exchanger (80). When high-temperature water heated by the water heat exchanger (20) is sent to the indoor heat exchanger (80), the air transferred by the cross-flow fan (70) is heated in the indoor heat exchanger (80).
    • -Operation of Air Conditioning Apparatus-
  • The air conditioning apparatus (1) performs a cooling operation and a heating operation.
    • <Cooling Operation>
  • The cooling operation is an operation of cooling air in the indoor space. In the cooling operation, the four-way switching valve (22) is set to the first state, and the three-way valve (34) is set to the first state, so that the compressor (14), the outdoor fan (12), the pump (32), and the cross-flow fan (70) are operated. In the cooling operation, the water flowing through the water circuit (30) is cooled by the water heat exchanger (20) and is sent to the indoor heat exchanger (80). The air transferred by the cross-flow fan (70) is cooled when passing through the indoor heat exchanger (80) and is supplied to the indoor space.
    • <Heating Operation>
  • The heating operation is an operation of heating air in the indoor space. In the heating operation, the four-way switching valve (22) is set to the second state, and the three-way valve (34) is set to the first state, so that the compressor (14), the outdoor fan (12), the pump (32), and the cross-flow fan (70) are operated. In the heating operation, the water flowing through the water circuit (30) is heated by the water heat exchanger (20) and is sent to the indoor heat exchanger (80). The air transferred by the cross-flow fan (70) is heated when passing through the indoor heat exchanger (80) and is supplied to the indoor space.
    • -Detailed Configuration of Indoor Unit-
  • The configuration of the indoor unit (7) will be described in detail with reference to FIGS. 2 to 6. In the following description, the terms relating to "up," "down," "right," "left," "front," and "back" refer to the directions of arrows in FIGS. 2, 3, 5, and 6. The front-rear direction corresponds to a first direction. The left-right direction corresponds to a second direction. The up-down direction corresponds to a third direction.
  • The indoor unit (7) illustrated in FIG. 2 is of a wall-mounted type. The indoor unit (7) is installed on a lower portion of a wall in the indoor space. As illustrated in FIG. 3, the indoor unit (7) includes the casing (50), the cross-flow fan (70), the indoor heat exchanger (80), an air filter (82), and a fan guard (84). In this specification, the "outer peripheral surface (70a) of the cross-flow fan (70)" refers to a surface of a cylindrical shape indicated by the rotation trajectory of a radially outer end portion of a blade (76) of the cross-flow fan (70).
    • <Casing>
  • The casing (50) has the shape of a hollow box. Specifically, the casing (50) has a longitudinal direction in the left-right direction and a lateral direction in the front-rear direction, and hence is in a rectangular parallelepiped shape relatively thin in the front-rear direction. The casing (50) houses the cross-flow fan (70), the indoor heat exchanger (80), the air filter (82), and the fan guard (84). The casing (50) is formed by combining metal plate members or resin plate members.
  • The casing (50) has a top panel (50a), a bottom plate (50b), a left panel (50c), a right panel (50d), a front panel (50e), and a rear panel (50f). The top panel (50a) and the bottom plate (50b), the left panel (50c) and the right panel (50d), and the front panel (50e) and the rear panel (50f) face each other. The top panel (50a) forms the upper surface of the casing (50). The bottom plate (50b) forms the lower surface of the casing (50). The left panel (50c) forms the right surface of the casing (50). The left panel (50c) forms the left surface of the casing (50). The front panel (50e) forms the front surface of the casing (50). The rear panel (50f) forms the rear surface of the casing (50).
  • The casing (50) has an inlet port (52), an outlet port (54), and an air passage (56). The inlet port (52) is an opening for sucking air in the indoor space. The inlet port (52) includes a first inlet port (52a) and a second inlet port (52b). The first inlet port (52a) is formed in a horizontally-long rectangular shape in a lower portion of the front surface of the casing (50), that is, in a lower portion of the front panel (50e). The width of the first inlet port (52a) in the left-right direction is greater than the width of the first inlet port (52a) in the up-down direction. A direction orthogonal to the opening surface of the first inlet port (52a) corresponds to the front-rear direction.
  • The first inlet port (52a) is provided with an inlet grille (90). The inlet grille (90) includes a plurality of guide panels (92). The plurality of guide panels (92) may be attached to a frame fitted in the first inlet port (52a), or may be directly attached to a peripheral edge portion of the first inlet port (52a). The second inlet port (52b) is formed in a horizontally-long rectangular shape in a front portion of the lower surface of the casing (50), that is, in a front portion of the bottom plate (50b). The width of the second inlet port (52b) in the left-right direction is greater than the width of the second inlet port (52b) in the front-rear direction.
  • The outlet port (54) is an opening for blowing out air which has exchanged heat into the indoor space. The outlet port (54) is formed in a horizontally-long rectangular shape in the upper surface of the casing (50), that is, in the top panel (50a). The width of the outlet port (54) in the left-right direction is greater than the width of the outlet port (54) in the front-rear direction. The outlet port (54) is provided with a plurality of flaps (55). The plurality of flaps (55) extends in the left-right direction, and is spaced apart from each other in the front-rear direction. Each flap (55) is an airflow direction adjustment panel that changes the direction of air blown out from the outlet port (54), and is attached to the casing (50) so as to be rotatable about an axis extending in the left-right direction.
  • The air passage (56) is a passage through which the inlet port (52) and the outlet port (54) communicate with each other, and is provided inside the casing (50). A passage-forming portion (60) is provided inside the casing (50). The passage-forming portion (60) forms part of the air passage (56) closer to the inlet port (52) into a scroll shape, and houses the cross-flow fan (70). The air passage (56) formed by the passage-forming portion (60) is open forward and downward at a lower portion, and extends forward and upward from the scroll-shaped portion. The passage-forming portion (60) includes a stabilizer (62) and a rear guider (64). The stabilizer (62) and the rear guider (64) are each metal components or resin molded products.
  • The stabilizer (62) is attached to the front panel (50e), and is disposed above the cross-flow fan (70). The stabilizer (62) divides the air passage (56) formed by the passage-forming portion (60) into a suction space (56a) and a discharge space (56b). The suction space (56a) is a space where air is sucked into the cross-flow fan (70) through the inlet port (52), and is provided between the inlet port (52) and the cross-flow fan (70). The discharge space (56b) is a space where air is discharged toward the outlet port (54) from the cross-flow fan (70), and is provided downstream of the cross-flow fan (70).
  • The stabilizer (62) forms the front wall surface of the air passage (56). The stabilizer (62) has a tongue portion (63). The tongue portion (63) is formed at a lower portion of the stabilizer (62) on the rear side, and protrudes obliquely downward toward the rear side with respect to a front portion of the lower surface of the stabilizer (62). The tongue portion (63) is located above the axis (Ra) of the cross-flow fan (70). The tongue portion (63) is provided along part of the outer periphery of the cross-flow fan (70) on one side in the up-down direction, in this example, on the upper side, of the cross-flow fan (70), and extends in the left-right direction over the entire length of the cross-flow fan (70).
  • The tongue portion (63) is located in the vicinity of the outer peripheral surface (70a) of the cross-flow fan (70), and faces the outer peripheral surface (70a) with a gap therebetween. The tongue portion (63) forms a portion of the stabilizer (62) closest to the cross-flow fan (70). The tongue portion (63) forms the inner wall surface of the scroll-shaped portion of the air passage (56) formed by the passage-forming portion (60). The suction space (56a) is also provided in front of the tongue portion (63). The suction space (56a) corresponds to a second region (A2) (described later) of the inlet port (52) in the front-rear direction and extends so as to correspond to a portion of the cross-flow fan (70) closer to the inlet port (52) in the up-down direction.
  • The rear guider (64) is attached to the rear panel (50f) and the bottom plate (50b), and is disposed on the rear side of the cross-flow fan (70). In a precise sense, the rear guider (64) is disposed between the cross-flow fan (70) and the rear panel (50f) and between the cross-flow fan (70) and the bottom plate (50b). The rear guider (64) forms the lower wall surface and rear wall surface of the air passage (56). The rear guider (64) extends along the outer periphery of the cross-flow fan (70). The rear guider (64) has a curved portion that is closest to the outer peripheral surface (70a) of the cross-flow fan (70) at its lower portion and gradually separates from the outer peripheral surface of the cross-flow fan (70) as it extends upward.
  • The rear guider (64) forms a water receiver (65). The water receiver (65) is provided at an upper end portion of the rear guider (64), and is located so as to cover the lower end of the indoor heat exchanger (80) from below. The water receiver (65) is a drain pan that receives water, and receives condensed water generated in air at, or in the vicinity of, the indoor heat exchanger (80) inside the casing (50). Although not illustrated, the indoor unit (7) is provided with a drainage mechanism that discharges water in the water receiver to outside the room. For example, the drainage mechanism includes a drain pump, a drainpipe, and the like.
    • <Cross-Flow Fan>
  • The cross-flow fan (70) is housed in the air passage (56). The cross-flow fan (70) is provided such that its axis (Ra) is oriented in the left-right direction, and is disposed in a lower portion of the air passage (56) formed by the passage-forming portion (60). Specifically, the cross-flow fan (70) is disposed behind the inlet grille (90) so as to correspond to the first inlet port (52a) in the front-rear direction. The outer peripheral surface (70a) of the cross-flow fan (70) is located in the vicinity of the inlet grille (90). The shortest distance between the outer peripheral surface (70a) of the cross-flow fan (70) and the inlet grille (90) is 5 mm or more and 30 mm or less.
  • The cross-flow fan (70) rotates about the axis (Ra) extending in the left-right direction. The rotation direction of the cross-flow fan (70) of this example is a direction in which blades (76) of the cross-flow fan (70) rotate from the upper side to the lower side on the inlet port (52) side and in which the blades (76) of the cross-flow fan (70) rotate from the lower side to the upper side on the discharge side (see FIG. 7). The cross-flow fan (70) includes a fan rotor (72) illustrated in FIG. 4 and a motor (not illustrated). The fan rotor (72) has a plurality of partition panels (74), a plurality of blades (76), and two shaft portions (78).
  • The plurality of partition panels (74) each has a discoid shape, and is spaced apart from each other in the left-right direction such that their centers are aligned on the same straight line. The straight line connecting the centers of the plurality of partition panels (74) coincides with the axis (Ra) of the fan rotor (72). The two shaft portions (78) are formed so as to protrude outward in the left-right direction from the center portions of the partition panels (74) located at both ends of the fan rotor (72). One of the shaft portions (78) is rotatably supported by the left panel (50c) or right panel (50d) of the casing (50) or a spindle member fixed to the casing (50). The other shaft portion (78) is coupled to the motor.
  • The plurality of blades (76) are provided between adjacent ones of the plurality of partition panels (74) and bridged between outer peripheral portions of a pair of partition panels (74) facing each other. The large number of blades (76) are spaced apart from each other in the circumferential direction of the fan rotor (72). Each blade (76) is curved so as to bulge toward the opposite side of the rotation direction (direction indicated by an arrow in FIG. 4) in the circumferential direction of the fan rotor (72), and is arranged in an orientation inclined with respect to the radial direction of the fan rotor (72) such that a portion of the blade (76) closer to the radially inner side of the fan rotor (72) is located closer to the opposite side of the rotation direction in the circumferential direction of the fan rotor (72).
    • <Indoor Heat Exchanger>
  • As illustrated in FIG. 3, the indoor heat exchanger (80) is disposed downstream of the cross-flow fan (70) in the air passage (56). The indoor heat exchanger (80) is, for example, a fin-and-tube heat exchanger. The indoor heat exchanger (80) is fixed to the casing (50) and the passage-forming portion (60) such that substantially all the air flowing through the air passage (56) passes through the indoor heat exchanger (80). The indoor heat exchanger (80) of this example is provided above the passage-forming portion (60) in a forwardly inclined orientation, in which the indoor heat exchanger (80) tilts forward with its upper portion further to the front. A lower portion of the indoor heat exchanger (80) is located on the rear side of the casing (50) and supported by the water receiver (65). The upper portion of the indoor heat exchanger (80) is supported by the front panel (50e) of the casing (50).
    • <Air Filter>
  • The air filter (82) is disposed upstream of the cross-flow fan (70) in the air passage (56) and in the vicinity of the inlet port (52). The air filter (82) is attached to the casing (50) or the passage-forming portion (60) such that substantially all the air to be sucked into the cross-flow fan (70) passes through the air filter (82). The air filter (82) is located between the first inlet port (52a) and the cross-flow fan (70) and between the second inlet port (52b) and the cross-flow fan (70). The air filter (82) is provided on the back side of the inlet grille (90).
  • The air filter (82) and the passage-forming portion (60) together surround the cross-flow fan (70). The air filter (82) of this example is formed in an L-shape so as to be continuously arranged to correspond to the first inlet port (52a) and the second inlet port (52b). The air filter (82) may be provided separately for the first inlet port (52a) and the second inlet port (52b). The air filter (82) collects dust in the air to be sucked into the air passage (56) through the inlet port (52). For example, the air filter (82) is formed of a metal mesh made of stainless steel or the like.
    • <Fan Guard>
  • The fan guard (84) is a guard fence that prevents part of a human body, such as a finger, or a foreign object from entering the air passage (56) through the inlet port (52). The fan guard (84) is disposed further inward in the air passage (56) than the air filter (82), and is located between the air filter (82) and the cross-flow fan (70). The fan guard (84) is provided on the back side of the air filter (82). The fan guard (84) is formed of a plurality of rods (86). The plurality of rods (86) extends in the left-right direction, and is spaced apart from each other along the back surface of the air filter (82). Each rod (86) is made of metal, for example, and is fixed to the casing (50).
    • <Inlet Port and Inlet Grille>
  • As illustrated in FIGS. 5 and 6, the up-down width of the first inlet port (52a) is greater than the diameter of the cross-flow fan (70). This ensures the flow rate of air sucked into the air passage (56) by the operation of the cross-flow fan (70). This allows air to flow efficiently through the air passage (56). The first inlet port (52a) is divided into three regions in relation to the cross-flow fan (70) in front view. The first inlet port (52a) has a first region (A1), the second region (A2), and a third region (A3).
  • The first region (A1) is a region overlapping the cross-flow fan (70) in the front view of the first inlet port (52a), that is, when the first inlet port (52a) is viewed in the front-rear direction. An upper portion of the first region (A1) corresponds to a rotating portion of the cross-flow fan (70) toward the inlet port (52). The second region (A2) is a region of the first inlet port (52a) on the side closer to the tongue portion (63) in the up-down direction relative to the first region (A1). In this example, the second region (A2) is located above the first region (A1). The third region (A3) is a region of the first inlet port (52a) on the side opposite to the side closer to the tongue portion (63) in the up-down direction relative to the first region (A1). In this example, the third region (A3) is located below the first region (A1).
  • Each of the plurality of guide panels (92) of the inlet grille (90) has a length corresponding to the left-right direction and a width in a direction orthogonal to the left-right direction. Each guide panel (92) is a fixed guide panel fixed in a certain orientation, and is hatched with dots in FIG. 5. In this specification, the "orientation of the guide panel (92)" corresponds to the width direction of the guide panel (92) (direction in which a second straight line (L2), described later, extends), and is a direction in which the air passing through the inlet grille (90) is guided. The plurality of guide panels (92) includes guide panels (92) provided in different orientations. The plurality of guide panels (92) includes a first guide panel (92a), a second guide panel (92b), a third guide panel (92c), and a fourth guide panel (92d).
  • The first guide panel (92a) is a guide panel (92) located closest to the center (C1) of the cross-flow fan (70). The second guide panel (92b) is a guide panel (92) disposed in the second region (A2) of the inlet port (52). The third guide panel (92c) is a guide panel (92) located above the first guide panel (92a) in the first region (A1), that is, located between the first guide panel (92a) and the second guide panel (92b). The fourth guide panel (92d) is a guide panel disposed on the opposite side from the second guide panel (92b) relative to the first guide panel (92a). The fourth guide panel (92d) is located in the first region (A1) below the first guide panel (92a) or the third region (A3). There are a plurality of second guide panels (92b), third guide panels (92c), and fourth guide panels (92d) in the present example.
  • Whether a guide panel (92) is disposed in the first region (A1), the second region (A2), or the third region (A3) is determined by which region includes the center (C2) of the guide panel (92) in a cross section of the indoor unit (7) that is orthogonal to the left-right direction (hereinafter referred to as a target cross section). When the center (C2) of the guide panel (92) is located in the first region (A1), the guide panel (92) is the first guide panel (92a), the third guide panel (92c), or the fourth guide panel (92d). When the center (C2) of the guide panel (92) is located in the second region (A2), the guide panel (92) is the second guide panel (92b). When the center (C2) of the guide panel (92) is located in the third region (A3), the guide panel (92) is the fourth guide panel (92d). In this specification, the "center (C2) of the guide panel (92)" refers to the center position of the guide panel (92) in the width direction and the center position of the guide panel (92) in the thickness direction in the target cross section of the guide panel (92).
  • Hereinafter, in the target cross section of the indoor unit (7), a straight line passing through the center of the guide panel (92) and the center (C2) of the cross-flow fan (70) is defined as a first straight line (L1). In the target cross section of the indoor unit (7), a straight line passing through the upstream end (93a) of the guide panel (92) on the upstream side in the air flow direction and the downstream end (93b) of the guide panel (92) on the downstream side in the air flow direction is defined as the second straight line (L2). Among the intersections between the outer peripheral surface (70a) of the cross-flow fan (70) and the first straight lines (L1), an intersection closer to the first inlet port (52a) is defined as a first intersection (P1). Among the intersections between the outer peripheral surface (70a) of the cross-flow fan (70) and the second straight lines (L2), an intersection closer to the first inlet port (52a) is defined as a second intersection (P2).
  • The first guide panel (92a), part of the second guide panels (92b), each third guide panel (92c), and each fourth guide panel (92d) are provided in an orientation in which the second straight lines (L2) are inclined with respect to the front-rear direction. In this specification, when the second straight line (L2) of the guide panel (92) is inclined upward with respect to a virtual straight line (L3) corresponding to the front-rear direction, such an inclination angle is denoted with "upward". When the second straight line (L2) of the guide panel (92) is inclined downward with respect to the virtual straight line (L3) corresponding to the front-rear direction, such an inclination angle is denoted with "downward".
  • The first guide panel (92a) is provided in an orientation inclined with respect to the front-rear direction such that the second intersection (P2) is located on the trailing side in the rotation direction of the cross-flow fan (70) relative to the first intersection. The first guide panel (92a) is inclined with respect to the front-rear direction such that the second straight line (L2) extends upward toward the cross-flow fan (70). A first inclination angle θ1 formed by the second straight line (L2) of the first guide panel (92a) with respect to the front-rear direction satisfies 0° < θ1 ≤ 60°. The first inclination angle θ1 of this example is about 30° upward.
  • Similarly to the first guide panel (92a), each fourth guide panel (92d) is inclined with respect to the front-rear direction such that the second straight line (L2) extends upward toward the cross-flow fan (70). Each fourth guide panel (92d) of this example is provided in the same orientation as that of the first guide panel (92a). That is, similarly to the first inclination angle θ1, a fourth inclination angle θ4 formed by the second straight line (L2) of each fourth guide panel (92d) with respect to the front-rear direction satisfies 0° < θ1 ≤ 60°. The fourth inclination angle θ4 of this example is the same as the first inclination angle θ1, which is about 30° upward.
  • Each second guide panel (92b) is provided in an orientation in which the second straight line (L2) intersects the outer peripheral surface (70a) of the cross-flow fan (70). Each second guide panel (92b) is inclined with respect to the front-rear direction such that the second straight line (L2) extends downward toward the cross-flow fan (70). Each second guide panel (92b) of this example is provided in an orientation inclined with respect to the front-rear direction such that the second intersection (P2) is located on the trailing side in the rotation direction of the cross-flow fan (70) relative to the first intersection (P1). A second inclination angle θ2 formed by the second straight line (L2) of each second guide panel (92b) with respect to the front-rear direction satisfies 0° ≤ θ2 ≤ 45°. The second inclination angle θ2 of this example is about 30° downward.
  • Each third guide panel (92c) is provided in an orientation in which a third inclination angle θ3 formed by the second straight line (L2) with respect to the front-rear direction is an angle between the first inclination angle θ1 and the second inclination angle θ2. The third inclination angle θ3 varies depending on the position of the third guide panel (92c) in the up-down direction. The third inclination angles θ3 of the plurality of third guide panels (92c) differ stepwise from the lower side to the upper side such that the orientation of the third guide panel (92c) approaches the orientation of the second guide panel (92b) from the orientation of the first guide panel (92a). The third guide panels (92c) are oriented in a substantially radial manner as a whole, such that their second straight lines (L2) substantially intersect one another on the side closer to the cross-flow fan (70).
  • The third guide panels (92c) closer to the first guide panel (92a) are inclined with respect to the front-rear direction such that the third guide panels (92c) each have the third inclination angle θ3 smaller than the first inclination angle θ1 and that the second straight lines (L2) extend upward toward the cross-flow fan (70). The third guide panels (92c) closer to the second guide panel (92b) are inclined with respect to the front-rear direction such that the third guide panels (92c) each have the third inclination angle θ3 smaller than the second inclination angle θ2 and that the second straight lines (L2) extend downward toward the cross-flow fan (70). In this example, among the plurality of third guide panels (92c), the third guide panel (92c) located almost in the middle in the up-down direction is in an orientation in which the second straight line (L2) extends straight in the front-rear direction, that is, an orientation in which the third inclination angle θ3 is 0°.
  • When the cross-flow fan (70) rotates, the indoor air is sucked into the air passage (56) from the inlet port (52) through the inlet grille (90), the air filter (82), and the fan guard (84). The indoor air sucked into the air passage (56) from the inlet port (52) is guided by the plurality of guide panels (92) when passing through the inlet grille (90), and passes through the air filter (82) and flows into the suction space (56a) with almost no change in the flow direction. At this moment, the flow of the air guided by the first guide panel (92a) imparts pre-whirl to the flow of air sucked into the cross-flow fan (70). The flow of the air guided by the second guide panels (92b) forms a smooth flow toward the cross-flow fan (70).
    • -Air-Blowing Performance of Indoor Unit-
  • FIG. 10 shows the specifications of the guide panels (92) of an indoor unit (7) of Example and indoor units (7) of Comparative Examples 1 to 3 and the rotational speed [rpm] of the cross-flow fan (70) at the same air flow rate (9.45 m3/min).
  • A basic configuration of the indoor unit (7) of Example is the same as that of the above-described embodiment illustrated in FIG. 6. In the indoor unit (7) of Example, the number of guide panels (92) is 13, and the thickness of the guide panel (92) is 2.0 mm. Among the 13 guide panels (92), seven guide panels (92) located on the lower side are the first guide panel (92a) and the fourth guide panels (92d). The first guide panel (92a) and the fourth guide panel (92d) are oriented such that the inclination angle (the first inclination angle θ1 and the fourth inclination angle θ4) formed by the second straight line (L2) with respect to the front-rear direction is 30° upward. Two guide panels (92) located on the upper side are the second guide panels (92b). The second guide panels (92b) are oriented such that the second inclination angle θ2 is 30° downward.
  • The indoor unit (7) of Comparative Example 1 has the same configuration as that of the indoor unit (7) of Example except for the number of guide panels (92) and the thickness and orientation of the guide panels (92). As illustrated in FIG. 7, in the indoor unit (7) of Comparative Example 1, the number of the guide panels (92) is 12. The thickness of each guide panel (92) is 1.2 mm. All the 12 guide panels (92) are oriented such that the second straight line (L2) extends straight in the front-rear direction, that is, oriented horizontally such that the inclination angle (the first to fourth inclination angles θ1 to θ4) formed by the second straight line (L2) with respect to the front-rear direction is 0°.
  • The indoor unit (7) of Comparative Example 2 has the same configuration as that of the indoor unit (7) of Example except for the orientation of the guide panels (92). As illustrated in FIG. 8, in the indoor unit (7) of Comparative Example 2, all the 13 guide panels (92) are uniformly oriented such that the inclination angle (first to fourth inclination angles θ1 to θ4) formed by the second straight line (L2) with respect to the front-rear direction is 30° upward.
  • The indoor unit (7) of Comparative Example 3 has the same configuration as that of the indoor unit (7) of Example except for the orientation of the guide panels (92). As illustrated in FIG. 9, among the 13 guide panels (92) of the indoor unit (7) of Comparative Example 3, four guide panels (92) located on the lower side constitute part of the fourth guide panels (92d). The part of the fourth guide panels (92d) is oriented such that the fourth inclination angle θ4 is 30° upward. Five guide panels (92) located on the upper side are the second guide panels (92b) and part of the third guide panels (92c). The second guide panels (92b) and part of the third guide panels (92c) are oriented such that the inclination angle (the second inclination angle θ2 and the third inclination angle θ3) formed by the second straight line (L2) with respect to the front-rear direction is 30° downward. The other guide panels (92) (the first guide panel (92a), the remaining third guide panels (92c) and fourth guide panel (92d)) are oriented in a substantially radial manner as a whole, similarly to the third guide panels (92c) of the above-described embodiment. The other guide panels (92) are oriented at angles between 30° upward and 30° downward such that the inclination angles (the second inclination angle θ2 and the third inclination angle θ3), each formed by the second straight line (L2) with respect to the front-rear direction, approaches 30° downward from 30° upward from the guide panel (92) on the lower side toward the guide panel (92) on the upper side.
  • As illustrated in FIG. 10, in the indoor unit (7) of Example, the rotational speed of the cross-flow fan (70) for the same air flow rate (9.45 m3/min) is lower as compared to the indoor units (7) of Comparative Examples 1 to 3. As described above, according to the indoor unit (7) of Example, the same air flow rate (9.45 m3/min) can be achieved even when the rotational speed of the cross-flow fan (70) is relatively low. This can be achieved because the first guide panel (92a) imparts pre-whirl to the flow of air sucked into the cross-flow fan (70), thereby increasing the pressure of the cross-flow fan (70), while at the same time, the loss in the cross-flow fan (70) is reduced by allowing a smooth flow, into the cross-flow fan (70), of the air guided by the second guide panels (92b) when passing through the inlet port (52) and sucked into the air passage (56). As a result, the energy efficiency of the indoor unit (7) can be improved.
    • -Features of Embodiment-
  • In the indoor unit (7) of this embodiment, the inlet port (52) has the first region (A1) corresponding to the cross-flow fan (70) when viewed in the front-rear direction, and the second region (A2) located on the side closer to the tongue portion (63) in the up-down direction relative to the first region (A1). Among the plurality of guide panels (92) arranged at the inlet port (52), the first guide panel (92a) located closest to the center (C1) of the cross-flow fan (70) in the first region (A1) is provided in the orientation inclined with respect to the front-rear direction. The first guide panel (92a) is oriented such that in the target cross section of the indoor unit (7), the second intersection (P2) close to the inlet port (52) among intersections between the outer peripheral surface (70a) of the cross-flow fan (70) and the second straight lines (L2) is located on the trailing side in the rotation direction of the cross-flow fan (70) relative to the first intersection (P1) close to the inlet port (52) among intersections between the outer peripheral surface (70a) of the cross-flow fan (70) and the first straight lines (L1). The first guide panel (92a) can impart pre-whirl to the flow of air sucked into the cross-flow fan (70) in the direction opposite to the rotation direction of the cross-flow fan (70), thereby increasing the pressure of the cross-flow fan (70).
  • As illustrated in FIG. 15, when all the guide panels (92) are uniformly provided in the same orientation as that of the first guide panel (92a), the air guided by the second guide panels (92b) located in the second region (A2) among the plurality of guide panels (92) flows outward in the radial direction of the cross-flow fan (70) and is then sucked into the cross-flow fan (70). Thus, the air guided by the guide panels (92) closer to the upper edge of the inlet port (52) has a long path to the cross-flow fan (70), which causes the loss in the cross-flow fan (70). On the other hand, in the indoor unit (7) of this embodiment, the second guide panels (92b) are provided in the orientation different from that of the first guide panel (92a). The second guide panels (92b) are oriented such that the second inclination angle θ2 is formed with respect to the front-rear direction on the side opposite to the side on which the first guide panel (92a) forms the first inclination angle θ1. According to this configuration, as illustrated in FIG. 11, the air guided by the second guide panel (92b) when passing through the inlet port (52) and sucked into the casing (50) can flow smoothly toward the cross-flow fan (70), as compared to a case in which the second guide panel (92b) is in the same orientation as that of the first guide panel (92a). Accordingly, the loss in the cross-flow fan (70) can be reduced.
  • In the indoor unit (7) of this embodiment, among the plurality of guide panels (92), the third guide panels (92c) located between the first guide panel (92a) and the second guide panels (92b) are provided in a different orientation from the orientations of the first guide panel (92a) and the second guide panels (92b). The third guide panels (92c) are oriented such that the third inclination angle θ3 formed by the second straight line (L2) with respect to the front-rear direction is an angle between the first inclination angle θ1 and the second inclination angle θ2. The third guide panels (92c) can reduce significant changes in orientation of the plurality of guide panels (92) between the first guide panel (92a) and the second guide panel (92b). This makes it possible to mitigate collision of flow of the air guided by adjacent guide panels (92) when the air passes through the inlet port (52). This is advantageous in reducing the loss in the cross-flow fan (70).
  • In the indoor unit (7) of this embodiment, the suction space (56a) in the casing (50) corresponds to the second region (A2) in the front-rear direction and extends so as to correspond to a portion of the cross-flow fan (70) closer to the inlet port (52) in the up-down direction. Such a suction space (56a) included in the casing (50) allows the inlet port (52) to have a wide opening area; however, when the second guide panels (92b) have the same orientation as that of the first guide panel (92a), the second guide panels (92b) guide the air passing through the inlet port (52) outward in the radial direction of the cross-flow fan (70), and the loss in the cross-flow fan (70) tends to increase. Thus, the technique of the present disclosure is particularly effective in this indoor unit (7).
  • In the indoor unit (7) of this embodiment, the first inclination angle θ1 formed by the second straight line (L2) of the first guide panel (92a) with respect to the front-rear direction is greater than 0° and 60° or less. When the first inclination angle θ1 is 60° or less, pre-whirl can be suitably imparted to the flow of air sucked into the cross-flow fan (70), while suppressing an excessive increase in resistance (air flow resistance) when the air passes through the inlet port (52).
  • In the indoor unit (7) of this embodiment, the second guide panels (92b) are inclined, with respect to the front-rear direction, toward a side opposite to the side toward which the first guide panel (92a) is inclined, and the second inclination angle θ2 formed by the second straight line (L2) of each second guide panel (92b) with respect to the front-rear direction is 0° or more and 45° or less. When the second inclination angle θ2 is 45° or less, the air passing through the inlet port (52) can be guided toward the cross-flow fan (70) by the second guide panels (92b), while suppressing an excessive increase in resistance (air flow resistance) when the air passes through the inlet port (52).
  • The air conditioning apparatus (1) of this embodiment includes the indoor unit (7). The indoor unit (7) can reduce the loss in the cross-flow fan (70). It is thus possible to enhance the energy-saving performance of the air conditioning apparatus (1).
    • -First Variation-
  • As illustrated in FIG. 12, in the indoor unit (7), each of the plurality of fourth guide panels (92d) is provided in the orientation in which the fourth inclination angle θ4 is greater than the first inclination angle θ1. As the distance between the fourth guide panel (92d) and the first guide panel (92a) increases, the fourth inclination angle θ4 formed by the fourth guide panel (92d) increases. That is, in the plurality of fourth guide panels (92d), the fourth inclination angle θ4 increases stepwise from the upper side to the lower side. The fourth inclination angle θ4 of each fourth guide panel (92d) satisfies 30° < θ4 ≤ 60°, and these angles are different from each other by several degrees. The fourth inclination angle θ4 may be different among all the fourth guide panels (92d), or may be equal to each other among only part of the fourth guide panels (92d) adjacent to each other and different among the other fourth guide panels (92d).
  • In the indoor unit (7) of this first variation, each fourth guide panel (92d) is oriented at the fourth inclination angle θ4 that is greater than the first inclination angle θ1. The fourth guide panels (92d) are guide panels (92) disposed on a side opposite to the second guide panels (92b) relative to the first guide panel (92a), and form the fourth inclination angles θ4 that increase as the distance from the first guide panel (92a) increases. The fourth guide panels (92d) can reduce significant changes in orientation of the plurality of guide panels (92) on the side opposite to the second guide panels (92b) relative to the first guide panel (92a). This makes it possible to mitigate collision of flow of the air guided by adjacent guide panels (92) when the air passes through the inlet port (52). This is advantageous in reducing the loss in the cross-flow fan (70).
    • -Second Variation-
  • As illustrated in FIG. 13, each second guide panel (92b) may be provided in an orientation in which the second inclination angle θ2 is smaller than the first inclination angle θ1 of the first guide panel (92a). In this example, each second guide panel (92b) is in an orientation in which the second straight line (L2) extends straight in the front-rear direction, that is, an orientation in which the second inclination angle θ2 is 0°. In this case, the third guide panels (92c) closer to the second guide panels (92b) may also be in an orientation in which the third inclination angle θ3 is 0°. Further, only part of the plurality of second guide panels (92b) may be provided in an orientation in which the second inclination angle θ2 is 0°.
  • The indoor unit (7) of the second variation can also provide effects similar to those of the above-described embodiment. That is, the first guide panel (92a) imparts pre-whirl to the flow of air sucked into the cross-flow fan (70), thereby increasing the pressure of the cross-flow fan (70), while at the same time, the loss in the cross-flow fan (70) is reduced by allowing a smooth flow, into the cross-flow fan (70), of the air guided by the second guide panels (92b) when passing through the inlet port (52) and sucked into the air passage (56).
    • <<Other Embodiments>>
  • As illustrated in FIG. 14, each second guide panel (92b) may be provided in an orientation in which the second inclination angle θ2 is greater than 0° and smaller than the first inclination angle θ1 of the first guide panel (92a). For example, the second inclination angle θ2 of each second guide panel (92b) satisfies 0° < θ2 < 30°. As a specific example, the first inclination angle θ1 of the first guide panel (92a) is about 30° upward, whereas the second inclination angle θ2 of each second guide panel (92b) is about 10° upward. Effects similar to those of the above-described embodiment can be obtained in this configuration as well.
  • In the indoor unit (7) having the above-described configuration, the third guide panels (92c) closer to the second guide panel (92b) may also be in an orientation in which the third inclination angle 03 is equal to the second inclination angle θ2. Further, only part of the plurality of second guide panels (92b) may be provided in an orientation in which the second inclination angle θ2 is greater than 0° and smaller than the first inclination angle θ1 of the first guide panel (92a) (for example, an orientation of about 10° upward).
  • Only the first inlet port (52a) may be provided as the inlet port (52) of the casing (50). For example, the second inlet port (52b) may be omitted in the indoor unit (7) of the above-described embodiment. The inlet port (52) may include only the first region (A1) and the second region (A2), and may not include the third region (A3).
  • The positions at which the inlet port (52) and the outlet port (54) are formed in the casing (50) and the configuration of the air passage (56) can be arbitrarily changed. For example, the positions of the inlet port (52) and the outlet port (54) may be reversed in the indoor unit (7) of the above-described embodiment. That is, the inlet port (52) may be formed in the upper surface of the casing (50), and the outlet port (54) may be formed in the lower portion of the front surface of the casing (50).
  • The air conditioning apparatus (1) may be configured as an apparatus only for heating that can execute only the heating operation, without including the four-way switching valve (22) in the refrigerant circuit (10). In this case, the indoor unit (7) forms a fan convector, for example. The air conditioning apparatus (1) may be configured as an apparatus only for cooling that can execute only the cooling operation.
  • The air conditioning apparatus (1) does not have to include the hot water supply unit (5). For example, the indoor heat exchanger (80) may be included in the refrigerant circuit (10) in place of the water heat exchanger (20). In this case, the refrigerant flows through the indoor heat exchanger (80). The indoor heat exchanger (80) is configured to exchange heat between the refrigerant flowing through the indoor heat exchanger (80) and the indoor air.
  • A floor heating device may be connected to the cooling/heating hot water supply system forming the air conditioning apparatus (1). In this case, the floor heating device may be configured to perform floor heating using heated water (hot water) stored in the water storage tank (40). A solar power generation apparatus may be connected to the cooling/heating hot water supply system. In this case, the water in the water storage tank (40) may be heated using power generated by the solar power generation apparatus.
  • The indoor unit (7) may be arranged on the front side of the ceiling surface and may be suspended from the ceiling surface. The indoor unit (7) may be arranged on the back side of the ceiling surface and may be suspended from a ceiling beam. The indoor unit (7) may be of a floor-mounted type.
  • The air conditioning apparatus (1) may include a plurality of indoor units (7). The space to be cooled and heated by the air conditioning apparatus (1) is not limited to the indoor space. The target space may be an internal space of a warehouse or the like, or may be a space in a factory.
  • The heat exchange unit according to the present disclosure may be a functional unit other than the indoor unit (7), such as the outdoor unit (3), as long as the heat exchange unit includes the cross-flow fan and the heat exchanger in the casing and imparts pre-whirl to the flow of air to be sucked into the cross-flow fan, using the guide panels provided at the inlet port of the casing.
  • While the embodiments and variations thereof have been described above, it will be understood that various changes in form and details may be made without departing from the spirit and scope of the claims. The foregoing embodiments and variations thereof may be combined and replaced with each other without deteriorating the intended functions of the present disclosure.
  • The ordinal numbers such as "first," "second," "third," ... in the description and claims are used to distinguish the terms to which these expressions are given, and do not limit the number and order of the terms.
    • INDUSTRIAL APPLICABILITY
  • As described above, the present disclosure is useful for a heat exchange unit and an air conditioning apparatus.
    • DESCRIPTION OF REFERENCE CHARACTERS
    • A1
    First Region
    A2
    Second Region
    C1
    Center of Cross-Flow Fan
    C2
    Center of Guide Panel
    L1
    First Straight Line
    L2
    Second Straight Line
    P1
    First Intersection
    P2
    Second Intersection
    Ra
    Axis
    1
    Air Conditioning Apparatus
    7
    Indoor Unit (Heat Exchange Unit)
    50
    Casing
    52
    Inlet Port
    54
    Outlet Port
    56
    Air Passage
    56a
    Suction Space
    63
    Tongue Portion
    70
    Cross-Flow Fan
    80
    Indoor Heat Exchanger (Heat Exchanger)
    92
    Guide Panel
    92a
    First Guide Panel
    92b
    Second Guide Panel
    92c
    Third Guide Panel
    92d
    Fourth Guide Panel
    93a
    Upstream End
    93b
    Downstream End

Claims (8)

  1. A heat exchange unit comprising:
    a casing (50) having an inlet port (52), an outlet port (54), and an air passage (56) allowing the inlet port (52) and the outlet port (54) to communicate with each other;
    a cross-flow fan (70) housed in the air passage (56); and
    a heat exchanger (80) disposed downstream of the cross-flow fan (70) in the air passage (56),
    the cross-flow fan (70) being disposed at a position corresponding to the inlet port (52) in a first direction orthogonal to an opening surface of the inlet port (52), the cross-flow fan (70) being configured to rotate about an axis (Ra) extending along a second direction orthogonal to the first direction,
    the casing (50) being provided with a tongue portion (63) forming a wall surface of the air passage (56) along part of an outer periphery of the cross-flow fan (70) on one side of the cross-flow fan (70) in a third direction orthogonal to the first direction and the second direction,
    the inlet port (52) including a first region (A1) overlapping the cross-flow fan (70) when viewed in the first direction, and a second region (A2) located on a side closer to the tongue portion (63) in the third direction relative to the first region (A1),
    the inlet port (52) being provided with a plurality of guide panels (92), each extending in the second direction and spaced apart from each other in the third direction,
    the plurality of guide panels (92) including a first guide panel (92a) located closest to a center (C1) of the cross-flow fan (70) in the first region (A1) and a second guide panel (92b) located in the second region (A2),
    in a cross section orthogonal to the second direction,
    for each guide panel (92), a straight line passing through a center (C2) of the guide panel (92) and the center (C1) of the cross-flow fan (70) being defined as a first straight line (L1),
    for each guide panel (92), a straight line passing through an upstream end (93a) of the guide panel (92) on an upstream side in an air flow direction and a downstream end (93b) of the guide panel (92) on a downstream side in the air flow direction being defined as a second straight line (L2),
    among intersections, each between an outer peripheral surface (70a) of the cross-flow fan (70) and the first straight line (L 1), an intersection closer to the inlet port (52) being defined as a first intersection (P1), and
    among intersections, each between the outer peripheral surface (70a) of the cross-flow fan (70) and the second straight line (L2), an intersection closer to the inlet port (52) being defined as a second intersection (P2),
    under these definitions
    the first guide panel (92a) being provided in an orientation inclined with respect to the first direction such that the second intersection (P2) is located on a trailing side in a rotation direction of the cross-flow fan (70) relative to the first intersection (P1),
    the second guide panel (92b) being provided in an orientation in which a second inclination angle formed by the second straight line (L2) of the second guide panel (92b) with respect to the first direction is smaller than a first inclination angle formed by the second straight line (L2) of the first guide panel (92a) with respect to the first direction, or in an orientation in which the second inclination angle is formed with respect to the first direction on a side opposite to a side on which the first guide panel (92a) forms the first inclination angle.
  2. The heat exchange unit of claim 1, wherein
    the plurality of guide panels (92) includes, in the first region (A1), a third guide panel (92c) located between the first guide panel (92a) and the second guide panel (92b), and
    the third guide panel (92c) is provided in an orientation in which a third inclination angle formed by the second straight line (L2) of the third guide panel (92c) with respect to the first direction is an angle between the first inclination angle and the second inclination angle.
  3. The heat exchange unit of claim 1 or 2, wherein
    the air passage (56) includes a suction space (56a) provided between the inlet port (52) and the cross-flow fan (70), and
    the suction space (56a) corresponds to the second region (A2) in the first direction and extends so as to correspond to a portion of the cross-flow fan (70) closer to the inlet port (52) in the third direction.
  4. The heat exchange unit of any one of claims 1 to 3, wherein
    the third direction corresponds to an up-down direction,
    the cross-flow fan (70) rotates such that a blade (76) of the cross-flow fan (70) rotates from an upper side to a lower side on a side closer to the inlet port (52),
    the first guide panel (92a) is inclined with respect to the first direction such that the second straight line (L2) extends upward toward the cross-flow fan (70), and
    the second guide panel (92b) is located higher than the first guide panel (92a), and is inclined with respect to the first direction such that the second straight line (L2) extends downward toward the cross-flow fan (70), or is in an orientation in which the second straight line (L2) is parallel to the first direction.
  5. The heat exchange unit of any one of claims 1 to 4, wherein
    the first inclination angle θ1 satisfies 0° < θ1 ≤ 60°.
  6. The heat exchange unit of any one of claims 1 to 5, wherein
    the second guide panel (92b) is in an orientation in which the second inclination angle is formed with respect to the first direction on a side opposite to a side on which the first guide panel (92a) forms the first inclination angle, and
    the second inclination angle θ2 satisfies 0° ≤ θ2 ≤ 45°.
  7. The heat exchange unit of any one of claims 1 to 6, wherein
    the plurality of guide panels (92) includes a plurality of fourth guide panels (92d) disposed on an opposite side from the second guide panel (92b) relative to the first guide panel (92a),
    each of the plurality of fourth guide panels (92d) is provided in an orientation in which a fourth inclination angle formed by the second straight line (L2) of the fourth guide panel (92d) with respect to the first direction is greater than the first inclination angle, and
    the fourth inclination angle increases as a distance between the fourth guide panel (92d) forming the fourth inclination angle and the first guide panel (92a) increases.
  8. An air conditioning apparatus comprising:
    the heat exchange unit (7) of any one of claims 1 to 7.
EP25842576.8A 2024-09-09 2025-05-29 Heat exchange unit and air conditioning device Pending EP4737809A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024155025A JP7741438B1 (en) 2024-09-09 2024-09-09 Heat exchange unit and air conditioning device
PCT/JP2025/019494 WO2026053515A1 (en) 2024-09-09 2025-05-29 Heat exchange unit and air conditioning device

Publications (1)

Publication Number Publication Date
EP4737809A1 true EP4737809A1 (en) 2026-05-06

Family

ID=97061850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP25842576.8A Pending EP4737809A1 (en) 2024-09-09 2025-05-29 Heat exchange unit and air conditioning device

Country Status (3)

Country Link
EP (1) EP4737809A1 (en)
JP (1) JP7741438B1 (en)
WO (1) WO2026053515A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62173616U (en) * 1986-04-22 1987-11-04
JPH03127137A (en) 1989-10-12 1991-05-30 Nec Corp File area allocating system
ITTN20020016A1 (en) * 2002-08-30 2004-02-29 Rosella Rizzonelli CONVECTIVE AND RADIANT FAN CONVECTOR.

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JP7741438B1 (en) 2025-09-18
WO2026053515A1 (en) 2026-03-12

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