EP3483544B1 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
EP3483544B1
EP3483544B1 EP16908178.3A EP16908178A EP3483544B1 EP 3483544 B1 EP3483544 B1 EP 3483544B1 EP 16908178 A EP16908178 A EP 16908178A EP 3483544 B1 EP3483544 B1 EP 3483544B1
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EP
European Patent Office
Prior art keywords
heat exchanger
transfer tube
heat transfer
fin
condensation water
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
EP16908178.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3483544A1 (en
EP3483544A4 (en
Inventor
Yuta KOMIYA
Daisuke Ito
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP3483544A1 publication Critical patent/EP3483544A1/en
Publication of EP3483544A4 publication Critical patent/EP3483544A4/en
Application granted granted Critical
Publication of EP3483544B1 publication Critical patent/EP3483544B1/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
    • 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
    • F25B39/02—Evaporators
    • 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
    • F28D1/053—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 straight
    • F28D1/0535—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 straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • 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
    • 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
    • F28F1/126—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 consisting of zig-zag shaped fins
    • F28F1/128—Fins with openings, e.g. louvered fins
    • 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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/006—Preventing deposits of ice
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/22—Safety or protection arrangements; Arrangements for preventing malfunction for draining

Definitions

  • the present invention relates to a heat exchanger having a corrugated fin.
  • a heat exchanger having the features of the preamble of claim 1 is known from EP 1 985 957 .
  • a heat exchanger having a corrugated fin (hereinafter also referred to as fin) has been known.
  • fin a parallel-flow heat exchanger exchanging heat between refrigerant flowing in a flat tube and air outside the flat tube is well known as an example of the conventional heat exchanger.
  • a plurality of flat tubes oriented in the vertical direction are arranged in parallel in the horizontal direction.
  • the flat tubes have respective upper ends provided with a header and respective lower ends opposite to the upper ends and provided with a header.
  • a corrugated fin is disposed between the flat tubes.
  • a conventional heat exchanger to be incorporated in an air conditioner is disposed to surround a cross-flow fan in the indoor unit (see for example PTL 1: Japanese Patent Laying-Open No. 2011-47600 ).
  • the above-described parallel-flow heat exchanger incorporated in the indoor unit is also disposed to surround the cross-flow fan.
  • the temperature of the surfaces of the flat tube and the fin is lower than the temperature of the air. Therefore, when the air passes through the heat exchanger, moisture in the air condenses into dew condensation water on the surfaces of the flat tube and the fin.
  • the gravity, a force imparted by the air passing through the heat exchanger, a surface tension between the flat tube and the dew condensation water, and a surface tension between the fin and the dew condensation water are applied to the dew condensation water generated on the fin surface of the heat exchanger.
  • the dew condensation water is caused to flow down on the flat tube into a lower portion of the heat exchanger, or to drip downwind from the heat exchanger, or to be held to stay between fins.
  • a drain pan is disposed below the heat exchanger.
  • the dew condensation water flowing down from the bottom of the heat exchanger is received by the drain pan and discharged outdoors.
  • the dew condensation water dripping downwind from the heat exchanger may not be received by the drain pan and the dew condensation water may be discharged from the inside to the outside of the indoor unit (into a room for example).
  • the dew condensation water generated on the fin surface of the heat exchanger may be caused to flow on the fin surface in the downwind direction by the gravity and the force imparted by the air passing through the heat exchanger. If the dew condensation water does not flow down on a side surface of the flat tube or a curved portion of the fin but flows down on the fin surface between parallel-arranged flat tubes in the downwind direction, the dew condensation water is scattered downwind without undergoing the advantageous effect given by the drainage channel of the flat tube or the drain groove. As a result of this, the scattered dew condensation water may be discharged from the inside to the outside (into a room) of the indoor unit.
  • An object of the present invention is to provide a heat exchanger preventing dew condensation water generated on the fin surface from being scattered downwind.
  • dew condensation water generated on the flat portion of the fin moves in the downstream (downwind) direction of flowing air and, at this time, the dew condensation water is brought into contact with the rib and guided by the rib toward one of the first end and the second end of the fin.
  • the dew condensation water flows through the first end to the surface of the heat transfer tube or flows along the second end of the fin, and then flows on the surface of the heat transfer tube or the second end of the fin to be finally collected by a drain pan or the like. Accordingly, the possibility that the dew condensation water flows as it is on the flat portion of the fin to be scattered downwind can be reduced.
  • Fig. 1 is a schematic perspective view showing a heat exchanger according to the present embodiment.
  • Fig. 2 is a schematic side view showing the heat exchanger according to the present embodiment.
  • Fig. 3 is a schematic perspective view of a relevant portion of the heat exchanger shown in Figs. 1 and 2 .
  • Fig. 4 is a schematic longitudinal cross-sectional view of the heat exchanger shown in Figs. 1 and 2 .
  • Fig. 5 is a schematic enlarged view of a rib shown in Fig. 4 .
  • Fig. 6 is a schematic cross-sectional view along line VI-VI in Fig. 5 .
  • Fig. 7 is a schematic cross-sectional view of a modification of the rib shown in Fig. 6.
  • Fig. 1 is a schematic perspective view showing a heat exchanger according to the present embodiment.
  • Fig. 2 is a schematic side view showing the heat exchanger according to the present embodiment.
  • Fig. 3 is a schematic perspective view of a
  • a heat exchanger 1 is disposed to extend in the vertical direction, and includes heat transfer tubes 2 that are a plurality of flat tubes arranged in parallel in the horizontal direction, a fin 3 that is a corrugated fin formed of a plate-like member and disposed between heat transfer tubes 2, and an inlet-side header 4a and an outlet-side header 4b disposed to extend horizontally.
  • Inlet-side header 4a and outlet-side header 4b are disposed to extend horizontally, inlet-side header 4a is connected to respective ends of heat transfer tubes 2, and outlet-side header 4b is connected to respective opposite ends of heat transfer tubes 2.
  • Heat transfer tube 2 In heat transfer tube 2, one or more flow paths 5 in which refrigerant flows are formed. In heat transfer tube 2, flow paths 5 are arranged in parallel. Heat transfer tube 2 is therefore a flat tube of which cross section is rectangular rather than circular. Fin 3 is a corrugated fin formed of a plate-like member folded in such a manner that flat portions 3a alternate with curved portions 3b and flat portions 3a are arranged substantially in parallel at predetermined intervals.
  • refrigerant flows into inlet-side header 4a from a refrigerant inlet/outlet port 6.
  • the refrigerant flowing into inlet-side header 4a flows through flow paths 5 in the heat transfer tube and then flows into outlet-side header 4b.
  • the refrigerant flowing into outlet-side header 4b flows out of refrigerant inlet/outlet port 6 of outlet-side header 4b.
  • the direction in which refrigerant flows is not limited to the direction described above, but may be the opposite direction.
  • Heat transfer tube 2 and fin 3 are brazed together between a side surface 2a of the outer wall of heat transfer tube 2 and curved portions 3b of fin 3. Air passes through the space between adjacent flat portions 3a of fin 3.
  • heat exchanger 1 configured in such a manner, heat is exchanged between refrigerant flowing through flow paths 5 in heat transfer tube 2 and air passing between fins 3.
  • At least one line-shaped rib 15 protruding upward in the vertical direction for example is formed on flat portion 3a of fin 3.
  • Rib 15 is formed to extend across the central line of the space between heat transfer tubes 2 arranged in parallel, namely the central line of flat portion 3a of fin 3.
  • Rib 15 has a rib central portion 15b located to overlap the central line of flat portion 3a, and a straight-line portion 15a in at least a part of the portion(s) continuing from rib central portion 15b.
  • Straight-line portion 15a of rib 15 is formed to incline from the downwind direction indicated by the arrow in Fig. 5 toward side surface 2a.
  • a louver 16 may be formed on flat portion 3a of fin 3.
  • line-shaped rib 15 may be a U-shaped rib as seen in plan view (also referred to as U-shaped rib) of which at least a part is straight-line portion 15a.
  • U-shaped rib 15 as shown in Figs. 4 and 5 , a central portion (rib central portion 15b) connecting straight-line portions 15a on respective ends opposite to each other is located upwind relative to straight-line portions 15a.
  • Straight-line portion 15a is formed to incline at angle ⁇ from the downwind direction toward side surface 2a (see Fig. 3 ). From a different perspective, straight-line portion 15a is described as being inclined at angle ⁇ from the central line of flat portion 3a of fin 3.
  • Angle ⁇ which is an inclination angle of straight-line portion 15a from the downwind direction or the central line of flat portion 3a may be more than or equal to 10° and less than or equal to 80°, for example.
  • the lower limit of angle ⁇ may be 20° or 30°.
  • the upper limit of angle ⁇ may be 70° or 60°.
  • the cross-sectional shape of rib 15 may be a triangular shape. As shown in Fig. 7 , the cross-sectional shape of rib 15 may be a semicircular shape.
  • the cross-sectional shape of rib 15 is not limited to the shapes shown in Figs. 6 and 7 , but may be any shape that can form a projection protruding from the surface of flat portion 3a.
  • FIG. 8 shows a case where heat exchanger 1 of the present embodiment is applied to an indoor unit 7 for a split-type air conditioner used by general households.
  • indoor unit 7 includes a casing 8 forming an outer shell, as well as heat exchanger 1 and a cross-flow fan 12 that are arranged in casing 8.
  • Casing 8 is equipped with a suction port 9 and a discharge port 10. While two suction ports 9 are formed in indoor unit 7 shown in Fig. 8 , three or more suction ports 9 may be formed.
  • a wind channel 11 is formed from suction ports 9 to discharge port 10. In indoor unit 7, heat of air drawn from suction port 9 is exchanged by heat exchanger 1.
  • Cross-flow fan 12 is driven to discharge the heat-exchanged air from discharge port 10 into a room.
  • heat exchanger 1 when heat exchanger 1 is used as an evaporator for exchange of heat of the air, moisture in the air passing between fins 3 may be condensed into dews sticking to the surface of heat transfer tube 2 and the surface of fin 3.
  • Indoor unit 7 is therefore equipped with a drain pan 13 for receiving dew condensation water generated in heat exchanger 1.
  • heat exchanger 1 may be disposed to incline from the vertical direction toward cross-flow fan 12 so as to extend over cross-flow fan 12.
  • Heat exchanger 1 is placed with inlet-side header 4a on the lower side and outlet-side header 4b on the upper side. Respective positions of inlet-side header 4a and outlet-side header 4b may be reversed.
  • a downwind force imparted by air passing through heat exchanger 1 and a force imparted by the gravity are applied to dew condensation water generated in heat exchanger 1. Therefore, the dew condensation water may drip into the cross-flow fan located downwind of heat exchanger 1 to be discharged from discharge port 10 into the room.
  • dew condensation water sticking to fin 3 can be classified into three types depending on the location to which the dew condensation water sticks. Specifically, the dew condensation water can be classified into dew condensation water 14a held in contact with side surface 2a of heat transfer tube 2, dew condensation water 14b held in contact with curved portion 3b of fin 3, and dew condensation water 14c held in contact with only flat portion 3a of fin 3 without being in contact with side surface 2a of heat transfer tube 2 and curved portion 3b of fin 3.
  • heat exchanger 1 is disposed to incline from the vertical direction toward cross-flow fan 12 to extend over cross-flow fan 12.
  • force Fa imparted by air passing through heat exchanger 1 and force Fg imparted by a gravity component in the direction along flat portion 3a are applied downwind to dew condensation water.
  • surface tension F1 between the dew condensation water and flat portion 3a of the fin is applied upwind to the dew condensation water.
  • surface tension F2 between dew condensation water 14a and side surface 2a is applied upwind.
  • surface tension F3 between dew condensation water 14b and curved portion 3b of the fin is applied upwind.
  • the total force applied downwind is represented by f1 and the total force applied upwind is represented by f2.
  • dew condensation water 14a to 14c flows downwind on the surface of fin 3 for example and may be scattered downwind from heat exchanger 1.
  • the total forces f1 and f2 are represented by respective formulas as indicated in the following.
  • f2b F1+F3.
  • Heat exchanger 1 includes at least one heat transfer tube 2 and fin 3. As shown in Figs. 1 and 2 , heat transfer tube 2 is disposed to extend in a single direction. The single direction is the direction of gravity, for example. Heat transfer tube 2 includes flow path 5 in which refrigerant flows. Fin 3 is connected to at least one heat transfer tube 2. Fin 3 includes a first end (a part of curved portion 3b of fin 3 with which dew condensation water 14a is held in contact and which is joined to heat transfer tube 2 in Fig. 9 ), flat portion 3a, and a second end (curved portion 3b of fin 3 with which due condensation water 14b is held in contact). The first end is connected to heat transfer tube 2.
  • Flat portion 3a continues from the first end.
  • the second end (curved portion 3b) is located opposite to the first end with respect to flat portion 3a.
  • Flat portion 3a has at least one line-shaped rib 15 protruding from flat portion 3a.
  • At least one rib 15 includes a rib central portion 15b located centrally between the first end and the second end (curved portion 3b).
  • At least one rib 15 also includes a portion (a portion from rib central portion 15b to an end of rib 15) formed to continue from rib central portion 15b and approach any one of the first end and the second end (curved portion 3b) in the downstream direction of flowing air. This portion includes a straight-line portion 15a.
  • a virtual straight line 15c extending from rib central portion 15b toward the end of rib 15 is inclined from the downwind direction toward heat transfer tube 2.
  • rib 15 is formed in such a manner that virtual straight line 15c approaches any one of the first end and the second end in the downstream direction of flowing air.
  • a part (rib central portion 15b) of at least one rib 15 is located at a center of flat portion 3a in the direction intersecting the direction in which air flows.
  • At least one rib 15 includes straight-line portion 15a.
  • Straight-line portion 15a is inclined by angle ⁇ with respect to the direction in which air flows, so as to approach any one of the first end and the second end (curved portion 3b) in the downstream direction of flowing air.
  • At least one heat transfer tube 2 includes a first heat transfer tube (heat transfer tube 2 located on the right side in Fig. 4 ) and a second heat transfer tube (heat transfer tube 2 located on the left side in Fig. 4 ).
  • the first heat transfer tube and the second heat transfer tube are arranged with fin 3 interposed therebetween.
  • the first heat transfer tube and the second heat transfer tube are arranged to extend in parallel with each other.
  • the first end of fin 3 is connected to the first heat transfer tube.
  • the outer surface of the second end (curved portion 3b) of fin 3 is connected to the second heat transfer tube.
  • dew condensation water 14c sticking to flat portion 3a of fin 3 flows downwind
  • dew condensation water 14c collides with rib 15 so that the direction in which dew condensation water 14c flows is changed.
  • Dew condensation water 14c then flows toward side surface 2a of heat transfer tube 2 or curved portion 3b of fin 3.
  • dew condensation water 14c is brought into contact with side surface 2a of heat transfer tube 2 or curved portion 3b of fin 3 to become dew condensation water 14a or dew condensation water 14b shown in Fig. 9 . Consequently, the ratio of dew condensation water 14a, 14b staying inside heat exchanger 1 can be increased, and the possibility that the dew condensation water scatters downstream from heat exchanger 1 can be reduced.
  • Fig. 11 is a schematic cross-sectional view of a relevant portion illustrating a first modification of the heat exchanger shown in Figs. 1 to 10
  • Fig. 12 is a schematic enlarged view of a rib of the heat exchanger shown in Fig. 11
  • the heat exchanger shown in Figs. 11 and 12 basically has a configuration similar to that of the heat exchanger shown in Figs. 1 to 10 , except that the shape of rib 15 as seen in plan view differs from that of the heat exchanger shown in Figs. 1 to 10 .
  • line-shaped rib 15 is a V-shaped rib 15 of which at least a part is a straight-line portion 15a as seen in plan view.
  • Fig. 13 is a schematic cross-sectional view of a relevant portion illustrating a second modification of the heat exchanger shown in Figs. 1 to 10
  • Fig. 14 is a schematic enlarged view of a rib of the heat exchanger shown in Fig. 13 .
  • the heat exchanger shown in Figs. 13 and 14 basically has a configuration similar to that of the heat exchanger shown in Figs. 1 to 10 , except that the shape of rib 15 as seen in plan view differs from that of the heat exchanger shown in Figs. 1 to 10 .
  • line-shaped rib 15 is a straight line-shaped rib 15 as seen in plan view.
  • Fig. 15 is a schematic perspective view of a relevant portion of a heat exchanger 1 according to the present embodiment.
  • the heat exchanger shown in Fig. 15 basically has a similar configuration to that of the heat exchanger shown in Figs. 1 to 10 , but differs from the heat exchanger shown in Figs. 1 to 10 in that a downwind-side front portion 2b of a heat transfer tube 2 is located downwind relative to the downwind-side end of a fin 3.
  • at least one heat transfer tube 2 includes a downstream-side end located downstream relative to fin 3 in the direction in which air flows (downstream-side end: a portion of heat transfer tube 2 located downstream relative to fin 3).
  • front portion 2b of heat transfer tube 2 protruding downwind relative to the downwind-side end face of fin 3 as well as a part of a side surface 2a of heat transfer tube 2 located between this front portion 2b and the downstream-side end of fin 3 are available as a drainage channel 17. Therefore, relative to the heat exchanger shown in Figs. 1 to 10 , the area available as drainage channel 17 is increased. Accordingly, even when a large amount of dew condensation water 14a to 14c is generated in heat exchanger 1, dew condensation water flowing on the surface of heat transfer tube 2 and/or curved portion 3b of fin 3 into drainage channel 17 is allowed to flow into a lower portion of heat exchanger 1. In this way, the amount of dew condensation water scattering downwind from heat exchanger 1 can be reduced.
  • Fig. 16 is a schematic perspective view of a relevant portion of a heat exchanger 1 according to the present embodiment.
  • the heat exchanger shown in Fig. 16 basically has a similar configuration to that of the heat exchanger shown in Fig. 15 , but differs from the heat exchanger shown in Fig. 15 in that a portion of side surface 2a of heat transfer tube 2 located downwind of fin 3 (region serving as drainage channel 17) has a depressed portion 2c formed therein. Depressed portion 2c is formed to extend in the direction in which heat transfer tube 2 extends.
  • Fig. 17 is a schematic perspective view of a relevant portion of a heat exchanger 1 according to the present embodiment.
  • the heat exchanger shown in Fig. 17 basically has a similar configuration to that of the heat exchanger shown in Fig. 16 , but differs from the heat exchanger shown in Fig. 16 in that a portion of side surface 2a of heat transfer tube 2 located downwind of fin 3 (region serving as drainage channel 17) additionally has a protruded portion 2d formed downstream of depressed portion 2c.
  • Protruded portion 2d is formed to extend in the direction in which heat transfer tube 2 extends.
  • Fig. 18 is a schematic perspective view of a relevant portion of a heat exchanger 1 according to the present embodiment.
  • the heat exchanger shown in Fig. 18 basically has a similar configuration to that of the heat exchanger shown in Fig. 15 , but differs from the heat exchanger shown in Fig. 15 in that a water absorbing member 18 is disposed on a portion of side surface 2a of heat transfer tube 2 located downwind of fin 3 (region serving as drainage channel 17). Water absorbing member 18 is fixed to side surface 2a of heat transfer tube 2. Water absorbing member 18 is formed to extend in the direction in which heat transfer tube 2 extends.
  • side surface 2a to which water absorbing member 18 is fixed as well as front portion 2b of heat transfer tube 2 are available as a drainage channel 17.
  • the aforementioned side surface 2a is located at the end of heat transfer tube 2 protruding downwind relative to the downwind-side end face of fin 3 and is further provided with water absorbing member 18 connected to the downstream end of heat transfer tube 2 (the portion of heat transfer tube 2 located downstream relative to fin 3).
  • the portion which is made available as the drainage channel by being equipped with water absorbing member 18 has a higher ability to hold dew condensation water. Therefore, relative to the case where the heat exchanger shown in Fig.
  • any material having a water absorbing property can be used.
  • any material having a water absorbing property can be used.
  • sponge-like resin or porous material may be used.
  • water absorbing member 18 is disposed on side surface 2a of heat transfer tube 2, water absorbing member 18 may be disposed in a groove formed in side surface 2a. In this case, the height to which water absorbing member 18 protrudes into the air flow path can be reduced and therefore, increase of the air flow resistance due to water absorbing member 18 can be suppressed.
  • the thickness of water absorbing member 18 may be identical to the depth of the groove so that the surface of water absorbing member 18 is coplanar with the portion of side surface 2a where the groove is not formed.
  • the present invention is effectively used for a parallel-flow heat exchanger as well as an air conditioner equipped with a parallel-flow heat exchanger.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
EP16908178.3A 2016-07-07 2016-07-07 Heat exchanger Active EP3483544B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/070185 WO2018008134A1 (ja) 2016-07-07 2016-07-07 熱交換器

Publications (3)

Publication Number Publication Date
EP3483544A1 EP3483544A1 (en) 2019-05-15
EP3483544A4 EP3483544A4 (en) 2019-10-09
EP3483544B1 true EP3483544B1 (en) 2023-07-26

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EP16908178.3A Active EP3483544B1 (en) 2016-07-07 2016-07-07 Heat exchanger

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EP (1) EP3483544B1 (ja)
JP (1) JP6771557B2 (ja)
WO (1) WO2018008134A1 (ja)

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Publication number Priority date Publication date Assignee Title
JP2021081081A (ja) * 2019-11-14 2021-05-27 ダイキン工業株式会社 伝熱管、及び、熱交換器

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EP3483544A1 (en) 2019-05-15
JP6771557B2 (ja) 2020-10-21
JPWO2018008134A1 (ja) 2019-03-14
WO2018008134A1 (ja) 2018-01-11
EP3483544A4 (en) 2019-10-09

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