EP3441683B1 - Indoor heat exchanger - Google Patents

Indoor heat exchanger Download PDF

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Publication number
EP3441683B1
EP3441683B1 EP17779080.5A EP17779080A EP3441683B1 EP 3441683 B1 EP3441683 B1 EP 3441683B1 EP 17779080 A EP17779080 A EP 17779080A EP 3441683 B1 EP3441683 B1 EP 3441683B1
Authority
EP
European Patent Office
Prior art keywords
flat tubes
heat exchange
exchange portion
indoor
heat transfer
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.)
Active
Application number
EP17779080.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3441683A4 (en
EP3441683A1 (en
Inventor
Shun Yoshioka
Yoshiyuki Matsumoto
Satoshi Inoue
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
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Filing date
Publication date
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Publication of EP3441683A1 publication Critical patent/EP3441683A1/en
Publication of EP3441683A4 publication Critical patent/EP3441683A4/en
Application granted granted Critical
Publication of EP3441683B1 publication Critical patent/EP3441683B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • F28F17/005—Means for draining condensates from heat exchangers, e.g. from evaporators
    • 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
    • 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
    • F24F1/0067—Indoor units, e.g. fan coil units characterised by heat exchangers by the shape of the heat exchangers or of parts thereof, e.g. of their fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0471—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F28F1/325—Fins with openings
    • 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
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/0071—Evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/12—Fins with U-shaped slots for laterally inserting conduits

Definitions

  • the present invention relates to an indoor heat exchanger, more particularly, to an indoor heat exchanger used for exchanging heat between indoor air and refrigerant.
  • Patent Literature 2 WO 2013/160957
  • a heat exchanger that uses flat tubes in place of the tubular heat transfer tubes In such a heat exchanger that uses flat pipes, air flow resistance is reduced.
  • a further example can be seen in document EP 2 995 886 A1 showing a heat exchanger configured such that flat tubes in at least two levels bent or connected to each other at one end in an axial direction of the flat tubes and the flat tubes in at least two columns connected to each other are included in refrigerant passages through which refrigerant flows, and a flow direction of gas is counter to flow of refrigerant through the refrigerant passages in a column direction while the heat exchanger serves as a condenser.
  • a heat exchanger must increase in size through, for example, providing more rows of tubes in order for the heat exchanger to achieve better performance.
  • Providing a plurality of rows of flat tubes in the heat exchanger described above causes a problem in that fins deform when the flat tubes are bent, and this increases air flow resistance.
  • flat tubes are longer than cylindrical tubes in the direction in which indoor air flows, and hence it becomes difficult to discharge condensed water that is generated in the indoor heat exchanger.
  • An indoor heat exchanger according to the present invention is defined in claim 1.
  • the dependent claims relate to preferred embodiments of the invention.
  • a first aspect of the present invention includes a first heat exchange portion including a plurality of first flat tubes arranged in rows and a plurality of first heat transfer fins that intersect with the plurality of first flat tubes, the first heat transfer portion being configured to exchange heat between indoor air that flows in a width direction of the plurality of first flat tubes and refrigerant that flows through the plurality of first flat tubes; and a second heat exchange portion including a plurality of second flat tubes arranged in rows and a plurality of second heat transfer fins that intersect with the plurality of second flat tubes, the second heat transfer portion being configured to exchange heat between indoor air that flows in a width direction of the plurality of second flat tubes and refrigerant that flows through the plurality of second flat tubes, the plurality of first heat transfer fins and the plurality of second heat transfer fins each including a windward main portion formed with a notch that receives the first flat tube and the second
  • the indoor heat exchanger because the notches of the first heat transfer fins and the second heat transfer fins are disposed inward and the first flat tubes and the second flat tubes each have an inwardly bent shape, deformation of the main portions of the first heat transfer fins and the main portions of the second heat transfer fins is reduced. Because the communication portions of the first heat transfer fins and the second heat transfer fins are disposed on a leeward side, condensed water guided by the indoor air traveling in the width direction of the first flat tubes and the second flat tubes can be sent in an up-down direction via the communication portion.
  • An indoor heat exchanger is the indoor heat exchanger according to the first aspect of the present invention, in which the first heat exchange portion and the second heat exchange portion each have the bent shape so as to surround an indoor fan with the inner peripheral sides, and are disposed such that indoor air discharged from the indoor fan disposed on the inner peripheral side can be guided along the width direction of the plurality of first flat tubes and the plurality of second flat tubes to pass between the plurality of first heat transfer fins and between the plurality of second heat transfer fins and reach the outer peripheral side on which the communication portion of the second heat transfer fins is located.
  • the indoor air discharged from the indoor fan surrounded by the inner peripheral sides of the first heat exchange portion and the second heat exchange portion can be discharged in the width direction of the first flat tubes and the second flat tubes, which has low air flow resistance.
  • condensed water can be sent across the entire indoor heat exchanger from the inner peripheral sides to the outer peripheral sides of the first heat exchange portion and the second heat exchange portion.
  • the indoor heat exchanger according to a third aspect of the present invention is the indoor heat exchanger according to the first or second aspect of the present invention, in which the plurality of first flat tubes are disposed so as to be positioned windward of windward edges of the plurality of first heat transfer fins by 0 mm or more.
  • the indoor heat exchanger because the plurality of first flat tubes are positioned windward of the windward edges of the plurality of first heat transfer fins by 0 mm or more, the first flat tubes protrude leeward of the windward edges of the first heat transfer fins by 0 mm or more, and hence first abut against a member or other component when, for example, the first heat exchange portion and the second heat exchange portion are bent. This reduces the occurrence of buckling of the windward edges of the plurality of first heat transfer fins, for example.
  • the indoor heat exchanger according to a fourth aspect of the present invention is the indoor heat exchanger according to the third aspect of the present invention, in which, in the plurality of first flat tubes arranged in rows and the plurality of second flat tubes arranged in rows, a thickness of tube walls at a windward portion located windward is larger than a thickness of tube walls at a side portion located in a row direction of the plurality of first flat tubes and the plurality of second flat tubes.
  • the tube walls at the windward portion located windward are thick, a reduction in compressive strength can be suppressed even if the first flat tubes and the second flat tubes are damaged by a jig when the first flat tubes and the second flat tubes are bent using the jig.
  • the indoor heat exchanger according to the first aspect of the present invention is the indoor heat exchanger in which the first heat exchange portion is configured so as not to make contact with the second heat exchange portion due to a clearance that is located between leeward edges of the plurality of first heat transfer fins of the first heat exchange portion and the windward main portions of the plurality of second heat transfer fins of the second heat exchange portion.
  • the indoor heat exchanger because the first heat exchange portion and the second heat exchange portion, which have different temperatures, are configured such as not to make contact with each other, heat transfer can be reduced from one of the first heat exchange portion and the second heat exchange portion to the other.
  • the indoor heat exchanger according to the first aspect of the present invention is the indoor heat exchanger in which the plurality of second flat tubes are arranged so as to be positioned windward of windward edges of the plurality of second heat transfer fins by 0 mm or more.
  • the indoor heat exchanger because the plurality of second flat tubes are positioned windward of the windward edges of the plurality of second heat transfer fins by 0 mm or more, the clearance between the first heat exchange portion and the second heat exchange portion can be easily maintained.
  • the indoor heat exchanger according to the first aspect of the present invention is the indoor heat exchanger in which the plurality of second flat tubes are disposed so as to be positioned windward of the windward edges of the plurality of second heat transfer fins by 2 mm or less.
  • the indoor heat exchanger because the plurality of second flat tubes are positioned windward of the windward edges of the plurality of second heat transfer fins by 2 mm or less, condensed water is more likely to be drawn by surface tension into a clearance of 2 mm or less formed between the first heat exchange portion and the second heat exchange portion, to flow and drop down.
  • the indoor heat exchanger according to a fifth aspect of the present invention is the indoor heat exchanger according to the first of the present invention, in which the leeward edges of the plurality of first heat transfer fins in the first heat exchange portion extend in a straight line along the clearance in a vertical direction.
  • the leeward edges of the plurality of first heat transfer fins extend in a straight line along the clearance in a vertical direction, condensed water is more likely to be guided along the leeward edges.
  • the indoor heat exchanger according to a sixth aspect of the present invention is the indoor heat exchanger according to any one of the fifth to fifth aspects of the present invention, in which the first heat exchange portion and the second heat exchange portion each have an L-shape, a C-shape, or a rectangular shape when viewed from the row direction of the plurality of first flat tubes and the plurality of second flat tubes.
  • the first heat exchange portion and the second heat exchange portion each have an L-shape, a C-shape, or a rectangular shape, windward space can be surrounded by either one or two pairs of the first heat exchange portion and the second heat exchange portion.
  • an increase in air flow resistance is reduced and the leeward communication portion improves drainability of water when condensation occurs.
  • drainability of condensed water can be improved by efficiently utilizing air flow discharged around by the indoor fan.
  • an increase in air flow resistance caused by deformation of the windward edges of the plurality of first heat transfer fins can be reduced.
  • heat exchange capacity is less likely to decrease due to thermal conduction between the first heat exchange portion and the second heat exchange portion.
  • the indoor heat exchanger According to the sixth aspect of the present invention, it becomes easy to prevent the degradation of the performance of the first heat exchange portion and the second heat exchange portion due to thermal conduction between the first heat exchange portion and the second heat exchange portion.
  • the configuration of the device to which the indoor heat exchanger is applied can be simplified.
  • FIG. 1 illustrates the external appearance of an indoor unit to which an indoor heat exchanger according to one embodiment of the present invention is applied.
  • FIG. 2 illustrates the internal structure of the indoor unit in FIG. 1 .
  • An indoor unit 100 is a ceiling-mounted indoor unit that is used to heat and cool a room inside, for example, a building such as a high-rise building through performing a vapor-compression refrigeration cycle. As illustrated in FIG. 2 , the indoor unit 100 is installed into a ceiling CE of a room inside a building such as a high-rise building.
  • the indoor unit 100 includes an indoor fan 120 and an indoor heat exchanger 10.
  • the indoor fan 120 operates to suck in indoor air through an intake port 101 provided on a lower center part of the indoor unit 100 and discharge this air from four discharge ports 102 provided in the indoor unit 100.
  • the four discharge ports 102 of the indoor unit 100 extend parallel to the four sides of a decorative plate 103 having a substantially square-shaped lower surface, respectively.
  • a bell mouth 104 is mounted directly above the intake port 101.
  • the indoor air sucked in through the intake port 101 is guided to the indoor fan 120 using this bell mouth 104.
  • the indoor air is discharged from the indoor fan 120 in a direction substantially parallel to the ceiling CE.
  • the indoor air passes through the indoor heat exchanger 10 that surrounds the indoor fan 120 in a horizontal direction to be discharged from the indoor fan 120 and then discharged from the four discharge ports 102 located further outside than the indoor heat exchanger 10.
  • Condensation may occur in the indoor heat exchanger 10 when, for example, the temperature of the indoor heat exchanger 10 becomes lower than the temperature of the room during a cooling operation.
  • a drain pan 130 is provided beneath the indoor heat exchanger 10 to receive condensed water generated by condensation in the indoor heat exchanger 10. The condensed water generated in the indoor heat exchanger 10 is pulled by gravity so as to flow down through the indoor heat exchanger 10 and drop from the indoor heat exchanger 10 into the drain pan 130.
  • FIG. 3 illustrates a state in which the indoor heat exchanger 10 is viewed from above.
  • the indoor heat exchanger 10 surrounds the indoor fan 120.
  • the arrows Ar1, Ar2, Ar3 and Ar4 in FIG. 3 indicate the direction of air flow.
  • the four discharge ports 102 are formed in the directions in which these arrows Ar1 to Ar4 face, respectively.
  • the indoor heat exchanger 10 has a shape similar to the four sides of a square with a diagonal center at the center of the indoor fan 120. However, a portion corresponding to where a drain pump 140 is located is recessed toward the inner periphery of the indoor heat exchanger 10.
  • the indoor heat exchanger 10 is, for example, a device that partly forms a refrigerant circuit (not illustrated) which performs a refrigerant cycle and exchanges heat between refrigerant that flows through the refrigerant circuit and indoor air.
  • a liquid pipe 51 and a gas pipe 52 that extend outward from the indoor heat exchanger 10 are connected to the refrigerant circuit. Liquid refrigerant and gas refrigerant primarily flow through the liquid pipe 51 and the gas pipe 52 that extend outward from the indoor heat exchanger 10, respectively.
  • FIG. 4 illustrates in an enlarged manner a partial cross-sectional structure of the indoor unit 100 at a place corresponding to a portion taken along the line I-I in FIG. 3 .
  • the indoor heat exchanger 10 includes a first heat exchange portion 11 on an inner peripheral side and a second heat exchange portion 12 on an outer peripheral side.
  • the first heat exchange portion 11 is disposed on a windward side and the second heat exchange portion 12 is disposed on a leeward side.
  • the first heat exchange portion 11 includes a plurality of first flat tubes 21 arranged in rows and a plurality of first heat transfer fins 31 that intersect with the plurality of first flat tubes 21.
  • the first flat tubes 21 and the first heat transfer fins 31 are substantially orthogonal to one another.
  • first heat transfer fin 31 Only one first heat transfer fin 31 is illustrated in FIG. 4 .
  • Other first heat transfer fins 31 that are adjacent to the first heat transfer fin 31 illustrated in FIG. 4 are arranged parallel to the first heat transfer fin 31 in FIG. 4 .
  • these adjacent first heat transfer fins 31 are not parallel to one another, and an interval between outer peripheral sides of the adjacent first heat transfer fins 31 is larger than an interval between inner peripheral sides of the adjacent first heat transfer fins 31.
  • a plurality of flow paths 21a are formed as one windward-to-leeward row inside one first flat tube 21, and refrigerant flows through each of these flow paths 21a.
  • the second heat exchange portion 12 includes a plurality of second flat tubes 22 arranged in rows and a plurality of second heat transfer fins 32 that intersect with the plurality of second flat tubes 22.
  • the second flat tubes 22 and the second heat transfer fins 32 are substantially orthogonal to one another. Only one second heat transfer fin 32 is illustrated in FIG. 4 .
  • Other second heat transfer fins 32 that are adjacent to the second heat transfer fin 32 illustrated in FIG. 4 are arranged parallel to the second heat transfer fin 32 in FIG. 4 .
  • these adjacent second heat transfer fins 32 are not parallel to one another, and an interval between outer peripheral sides of the adjacent second heat transfer fins 32 is larger than an interval between inner peripheral sides of the adjacent second heat transfer fins 32.
  • a plurality of flow paths 22a are formed as one windward-to-leeward row inside one second flat tube 22, and the refrigerant flows through each of these flow paths 22a.
  • FIG. 5 schematically illustrates an exemplary direction of flow of the refrigerant that flows through the indoor heat exchanger 10.
  • the indoor heat exchanger 10 includes a flow divider 53 connected to the liquid pipe 51, a liquid header 54 connected to the flow divider 53, a gas header 55 connected to the gas pipe 52, and a return header 56.
  • the indoor heat exchanger 10 illustrated in FIGS. 3 and 5 includes two pairs of the first heat exchange portion 11 and the second heat exchange portion 12.
  • the pair of heat exchange portions disposed near the drain pump 140 is referred to as a "first pair P1 of the first heat exchange portion 11 and the second heat exchange portion 12" or the “first pair P1" and the other pair of heat exchange portions is referred to as a "second pair P2 of the first heat exchange portion 11 and the second heat exchange portion 12" or the "second pair P2.”
  • the flow of refrigerant when the indoor heat exchanger 10 functions as an evaporator is indicated by the arrows Ar5 to Ar8.
  • liquid refrigerant flows in the direction of the arrow Ar5 after traveling from the liquid pipe 51 to the first flat tube 21 via the flow divider 53 and the liquid header 54.
  • the refrigerant that flows through the first flat tube 21 of the first pair P1 is returned by the return header 56 and flows from the first flat tube 21 into the second flat tube 22.
  • the refrigerant then travels in the direction of the arrow Ar6 to the gas pipe 52 via the gas header 55.
  • liquid refrigerant flows in the direction of the arrow Ar7 after traveling from the liquid pipe 51 to the first flat tube 21 via the flow divider 53 and the liquid header 54. Then, the refrigerant that flows through the first flat tube 21 of the second pair P2 is returned by the return header 56 and flows from the first flat tube 21 into the second flat tube 22. The refrigerant then flows in the direction of the arrow Ar8 to the gas pipe 52 via the gas header 55.
  • liquid refrigerant changes to gas refrigerant by evaporating while flowing through the first flat tube 21 and the second flat tube 22.
  • first pair P1 has two bent portions 10R and the second pair P2 only has one bent portion 10R.
  • the shapes of all of these bent portions 10R are classified as an L-shape.
  • the first pair P1 and the second pair P2 each have an L-shape such that inner peripheral sides of the first heat exchange portion 11 and the second heat exchange portion 12 surround the indoor fan 120.
  • Both the first pair P1 and the second pair P2 are disposed such that indoor air discharged from the indoor fan 120, which is disposed on the inner peripheral side, can be guided along a width direction of the first flat tubes 21 and the second flat tubes 22 to pass between a plurality of the first heat transfer fins 31 and a plurality of the second heat transfer fins 32 and reach an outer peripheral side on which a communication portion 34 (see FIG. 6 ) of the second heat transfer fin 32 is located.
  • FIG. 6 illustrates in a further enlarged manner a part of the first heat transfer fin 31 and the first flat tube 21 that is fitted into the first heat transfer fin 31 in the first heat exchange portion 11 illustrated in FIG. 4 .
  • the second heat exchange portion 12 has the same structure as that of the first heat exchange portion 11 illustrated in the enlarged manner in FIG. 6 . Therefore, herein, the first heat exchange portion 11 is described, but a description of components of the second heat exchange portion 12 that are the same as those of the first heat exchange portion 11 is omitted.
  • the first heat transfer fin 31 includes a windward main portion 33 formed with a notch 35 that receives the first flat tube 21, and the leeward communication portion 34 located on a side opposite to an open end 35a of the notch 35.
  • the first flat tube 21 is inserted in the direction of the arrow Ar9 in FIG. 6 .
  • the second heat transfer fin 32 includes the windward main portion 33 formed with the notch 35 that receives the second flat tube 22, and the leeward communication portion 34 located on a side opposite to the open end 35a of the notch 35.
  • a water guide rib 36 that facilitates condensed water discharge is formed in the communication portion 34. This guide rib 36 is a portion that extends from a pressed groove.
  • a protruded structure extends in the up-down direction along the guide rib 36 when the guide rib 36 is viewed from one main surface f1 of the first heat transfer fin 31 (or the second heat transfer fin 32), while a recessed structure extends in the up-down direction along the guide rib 36 when the guide rib 36 is viewed from the other main surface on a side opposite to the one main surface fl.
  • a plurality of raised-lance portions 37 are formed on the one main surface fl side of the first heat transfer fin 31 (or the second heat transfer fin 32). Each of the raised-lance portions 37 protrudes in a bridge shape. As seen in FIG. 6 , the raised-lance portions 37 are not formed around the notches 35.
  • FIGS. 7 to 9 A method of forming the bent portions 10R of the indoor heat exchanger 10 illustrated in FIG. 3 is described with reference to FIGS. 7 to 9 .
  • Two jigs are used to form the bent portions 10R. Examples of such jigs are illustrated in FIGS. 7 and 8 .
  • the bent portions 10R of the indoor heat exchanger 10 is formed using a rolling jig 210 and a pressing jig 220. As illustrated in FIG. 7 , the rolling jig 210 is brought into contact with a position at which the bent portion 10R is to be formed, and fixed to a part 300 of the indoor heat exchanger 10 on a side of an end 301 of the part 300.
  • the pressing jig 220 is pressed against the part 300 from a side opposite to a rolling part 211 of the rolling jig 210.
  • the pressing jig 220 is pressed against the part 300 at a position that is closer to the other end 302 of the part 300 than the position of the rolling part 211.
  • the pressing jig 220 applies force to the part 300 of the indoor heat exchanger 10 to bend the first flat tube 21 and the second flat tube 22 of the part 300.
  • the curvature radius of the second flat tube 22 is larger than that of the first flat tube 21 at the position where the bent portion 10R is formed.
  • an end of the second flat tube 22 is designed to protrude further outward than an end of the first flat tube 21 before the part 300 is bent so that the ends of the first flat tube 21 and the second flat tube 22 are not arranged too far apart from each other at the other end 302 of the part 300 when bending is completed.
  • FIG. 9 illustrates a portion of the part 300 in an enlarged manner.
  • the rolling jig 210 and the pressing jig 220 are pushed against the part 300.
  • it is mainly the first flat tube 21 that makes contact with the rolling jig 210.
  • a plate is interposed between the first heat exchange portion 11 and the second heat exchange portion 12 during bending. In other words, force is transmitted from the second flat tube 22 to the first heat transfer fin 31 via the plate during bending.
  • the area in which the pressing jig 220 comes into contact with the second heat transfer fin 32 is large.
  • Pressure applied to the second heat transfer fin 32 by the pressing jig 220 and pressure applied to the first heat transfer fin 31 by the plate are both smaller than pressure applied to the first flat tube 21 by the rolling jig 210.
  • buckling of a leeward edge 31b of the first heat transfer fin 31 and a leeward edge 32b of the second heat transfer fin 32 is less likely to occur during the bending.
  • the plurality of first flat tubes 21 are disposed so as to be positioned windward of windward edges 31a of the plurality of first heat transfer fins 31 by 0 mm or more.
  • a distance D1 illustrated in FIG. 6 between a windward end portion of the first flat tube 21 and the windward edge 31a of the first heat transfer fin 31 is 0 mm or more, and is preferably set to 0.5 mm or more in consideration of, for example, manufacturing errors.
  • the first flat tube 21 preferably protrudes outward in order to reduce the amount of force applied to the first heat transfer fin 31 during the bending.
  • first flat tube 21 and the second flat tube 22 are set in consideration of the force. More specifically, as illustrated in FIG. 10 , a thickness t3 of tube walls 21d, 22d at windward portions located on the windward side of the first flat tube 21 and the second flat tube 22 is larger than a thickness t2 of the tube walls 21c, 22c at side portions located in the row direction of the first flat tubes 21 and the second flat tubes 22.
  • the thickness t3 of the tube walls 21d, 22d at the windward portion located on the windward side is larger than a thickness t1 of inner walls 21b, 22b that divide flow paths of the multi-hole first flat tubes 21 and second flat tubes 22.
  • FIG. 11 illustrates in an enlarged manner a part of the first heat exchange portion 11 and the second heat exchange portion 12.
  • the first heat exchange portion 11 is configured such as not to make contact with the second heat exchange portion 12 through a clearance CL that is located between the leeward edge 31b of the first heat transfer fin 31 and the windward main portion 33 of the second heat transfer fin 32 of the second heat exchange portion 12. More specifically, the leeward edges 31b of the plurality of first heat transfer fins 31 of the first heat exchange portion 11 extend in a straight line along the clearance CL in a vertical direction. A distance of 2 mm or less is preferably allocated for the distance D3 between the leeward edge 31b of the first heat transfer fin 31 and the windward edge 32a of the second heat transfer fin 32.
  • the plurality of second flat tubes 22 are disposed so as to be positioned windward of the windward edges 32a of the plurality of second heat transfer fins 32 by 0 mm or more.
  • the distance D2 illustrated in FIG. 6 between a windward end portion of the second flat tube 22 and the windward edge 32a of the second heat transfer fin 32 is 0 mm or more, and is set to 2 mm or less such that condensed water is more easily drawn by surface tension to flow and drop downward.
  • This distance of 2 mm is set in consideration of the size of water droplets. If this distance is set 2 mm or more, water droplets are not as easily drawn down by surface tension (capillary action).
  • the second flat tube 22 preferably protrudes outward (the second flat tube 22 preferably protrudes outward by more than 0 mm from the windward edge 32a of the second heat transfer fin 32 and is positioned windward).
  • the indoor heat exchanger 10 is described by taking an example in which the indoor heat exchanger 10 is configured to enclose the entire periphery of windward space in which the indoor fan 120 is disposed when viewed from the row direction of the first flat tubes 21 and the second flat tubes 22 through the combination of the L-shaped first pair P1 and the L-shaped second pair.
  • the shape of the indoor heat exchanger 10 for surrounding the windward space in which the indoor fan 120 is disposed may be, for example, rectangular when viewed from the row direction of the first flat tubes 21 and the second flat tubes 22, such as that illustrated in FIG. 12 or 13 .
  • the arrows Ar11, Ar12 indicate the flow of refrigerant when a rectangular indoor heat exchanger 10 functions as an evaporator.
  • Liquid refrigerant flows in the direction of the arrow Ar11 after traveling from the liquid pipe 51 to the first flat tube 21 via the flow divider 53 and the liquid header 54. Then, the refrigerant that flows through the first flat tube 21 is returned by the return header 56 and flows from the first flat tube 21 into the second flat tube 22. The refrigerant then travels in the direction of the arrow Ar12 to the gas pipe 52 via the gas header 55.
  • the arrows Ar12, Ar14 indicate the flow of refrigerant in the first flat tube 21 of the first heat exchange portion 11 and the arrows Ar13, Ar15 indicate the flow of refrigerant in the second flat tube 22 of the second heat exchange portion 12 when the rectangular indoor heat exchanger 10 functions as an evaporator.
  • Liquid refrigerant flows in the directions of the arrows Ar12, Ar13 after traveling from the liquid pipe 51 to the first flat tube 21 via the flow divider 53 and the liquid header 54. Then, the refrigerant that flows through the first flat tube 21 flows in the direction of the arrows Ar14, Ar15 to the gas pipe 52 via the gas header 55.
  • the indoor heat exchanger 10 is described as surrounds the entire periphery of the indoor fan 120, but the indoor heat exchanger 10 may have a configuration that does not surround part of the periphery of the indoor fan.
  • the indoor heat exchanger 10 may have a C-shape such as that illustrated in FIGS. 14 and 15 when viewed from the row direction of the first flat tubes 21 and the second flat tubes 22.
  • FIG. 14 illustrates the internal structure of the indoor unit 100 when viewed from below
  • FIG. 15 illustrates a cross-sectional structure of the indoor unit 100 taken along the line II-II in FIG. 14
  • the indoor unit 100 includes the indoor fan 120 and the indoor heat exchanger 10.
  • the C-shaped indoor heat exchanger 10 is the hatched portion.
  • the indoor fan 120 operates to suck in indoor air through the intake port 101 provided on a lower center part of the indoor unit 100 and discharge this air from the discharge port 102 of the indoor unit 100.
  • the bell mouth 104 is mounted directly above the intake port 101 in the indoor unit 100.
  • the indoor air sucked in through the intake port 101 is guided to the indoor fan 120 using this bell mouth 104.
  • the indoor air is then discharged from the indoor fan 120 in a substantially horizontal direction.
  • the indoor air passes through the C-shaped indoor heat exchanger 10 that surrounds the indoor fan 120 in a horizontal direction to be discharged from the indoor fan 120 and then discharged from the discharge port 102.
  • Condensation may occur in the indoor heat exchanger 10 when, for example, the temperature of the indoor heat exchanger 10 becomes lower than the temperature of the room during a cooling operation.
  • the drain pan 130 is provided beneath the indoor heat exchanger 10 to receive condensed water generated in the indoor heat exchanger 10. The condensed water generated in the indoor heat exchanger 10 is pulled by gravity so as to flow down through the indoor heat exchanger 10 and drop from the indoor heat exchanger 10 into the drain pan 130.
  • the refrigerant that flows through the first flat tube 21 and the second flat tube 22 may be a substance other than refrigerant for vapor compression refrigerant, for example, water.
  • the present invention can also be applied to an indoor heat exchanger having three or more rows of heat exchange portions.
  • the indoor heat exchanger according to the present invention is not limited to being applied to the ceiling-mounted indoor unit 100 and can also be applied to, for example, an indoor unit that hangs from a ceiling.
  • first flat tubes 21 and the second flat tubes 22 are arranged at the same height, but the first flat tubes and the second flat tubes in the indoor heat exchanger according to the present invention may be arranged in a staggered fashion.
  • the notches 35 in the first heat transfer fin 31 and the second heat transfer fin 32 are disposed inward and the first flat tube 21 and the second flat tube 22 each have an inwardly bent shape.
  • This configuration reduces deformation of the main portions 33 of the first heat transfer fin 31 and the second heat transfer fin 32.
  • deformation of the main portions 33 of the first heat transfer fin 31 and the second heat transfer fin 32 is reduced, there is less possibility of increasing air flow resistance caused by such deformation and an increase in air flow resistance is thereby reduced.
  • the communication portions 34 of the first heat transfer fin 31 and the second heat transfer fin 32 are disposed on a leeward side, condensed water guided by the indoor air traveling in the width direction of the first flat tubes 21 and the second flat tubes 22 can be sent in the up-down direction via the communication portions 34, particularly guide ribs 36. In this way, drainability when condensation occurs is improved due to the leeward communication portions 34 of the first flat tube 21 and the second flat tube 22.
  • the first pair P1 and the second pair P2 of the indoor heat exchanger 10 each have an L-shape so as to surround the indoor fan 120 with the inner peripheral sides thereof.
  • the indoor heat exchanger 10 illustrated in FIGS. 12 and 13 is rectangular so as to surround the indoor fan 120 with the inner peripheral side thereof.
  • the indoor heat exchanger 10 illustrated in FIG. 14 has a C-shape so as to surround the indoor fan 120 with the inner peripheral side thereof.
  • indoor air discharged from the indoor fan 120 arranged on the inner peripheral side is guided along the width direction of the first flat tubes 21 and the second flat tubes 22 to pass between a plurality of the first heat transfer fins 31 and a plurality of the second heat transfer fins 32 and reach the outer peripheral side on which the communication portion 34 of the second heat transfer fin 32 is located.
  • drainability of condensed water is improved by efficiently utilizing air flow discharged around by the indoor fan 120.
  • the first flat tubes 21 are positioned windward of the windward edges 31a of the plurality of first heat transfer fins 31 by 0 mm or more.
  • the first flat tubes 21 protrude leeward of the windward edges 31a of the first heat transfer fins 31 by 0 mm or more, and hence first abut against a member such as the rolling jig 210 when, for example, the first heat exchange portion 11 and the second heat exchange portion 12 are bent.
  • an increase in air flow resistance caused by deformation of the windward edges 31a of the plurality of first heat transfer fins 31 can be reduced.
  • the clearance CL can be easily left between the first heat exchange portion 11 and the second heat exchange portion 12.
  • heat exchange capacity is less likely to decrease due to thermal conduction between the first heat exchange portion 11 and the second heat exchange portion 12.
  • a clearance CL of 2 mm or less can be reliably formed between the first heat exchange portion 11 and the second heat exchange portion 12.
  • the distance D3 between the leeward edge 31b of the first heat transfer fin 31 and the windward edge 32a of the second heat transfer fin 32 is 2 mm or less. Condensed water is more likely to be drawn by surface tension into this clearance of 2 mm or less formed between the first heat exchange portion 11 and the second heat exchange portion 12, to flow and drop down. As a result, condensed water in the indoor heat exchanger 10 is drained with better performance.
  • the windward space can be surrounded by two L-shaped pairs of the first heat exchange portion 11 and the second heat exchange portion 12, namely, the first pair P1 and the second pair P2 as illustrated in FIG. 5 , one rectangular pair of the first heat exchange portion 11 and the second heat exchange portion 12 as illustrated in FIGS. 12 and 13 , or one C-shaped pair of the first heat exchange portion and the second heat exchange portion as illustrated in FIG. 14 .
  • the configuration of the indoor unit 100 to which the indoor heat exchanger 10 is applied can be simplified.
EP17779080.5A 2016-04-07 2017-04-03 Indoor heat exchanger Active EP3441683B1 (en)

Applications Claiming Priority (2)

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JP2016077262A JP6380449B2 (ja) 2016-04-07 2016-04-07 室内熱交換器
PCT/JP2017/013908 WO2017175702A1 (ja) 2016-04-07 2017-04-03 室内熱交換器

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EP3441683A1 EP3441683A1 (en) 2019-02-13
EP3441683A4 EP3441683A4 (en) 2019-04-17
EP3441683B1 true EP3441683B1 (en) 2020-03-04

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US (1) US20190170372A1 (ja)
EP (1) EP3441683B1 (ja)
JP (1) JP6380449B2 (ja)
CN (1) CN108885015A (ja)
AU (1) AU2017247746B2 (ja)
ES (1) ES2793474T3 (ja)
WO (1) WO2017175702A1 (ja)

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Publication number Publication date
EP3441683A4 (en) 2019-04-17
JP6380449B2 (ja) 2018-08-29
US20190170372A1 (en) 2019-06-06
EP3441683A1 (en) 2019-02-13
ES2793474T3 (es) 2020-11-16
CN108885015A (zh) 2018-11-23
WO2017175702A1 (ja) 2017-10-12
AU2017247746B2 (en) 2018-12-06
JP2017187243A (ja) 2017-10-12
AU2017247746A1 (en) 2018-11-29

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