EP2980516B1 - Échangeur de chaleur et conditionneur d'air à cycle de réfrigération l'utilisant - Google Patents

Échangeur de chaleur et conditionneur d'air à cycle de réfrigération l'utilisant Download PDF

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Publication number
EP2980516B1
EP2980516B1 EP13880586.6A EP13880586A EP2980516B1 EP 2980516 B1 EP2980516 B1 EP 2980516B1 EP 13880586 A EP13880586 A EP 13880586A EP 2980516 B1 EP2980516 B1 EP 2980516B1
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EP
European Patent Office
Prior art keywords
heat exchange
heat exchanger
exchange unit
type heat
flow
Prior art date
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EP13880586.6A
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German (de)
English (en)
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EP2980516A1 (fr
EP2980516A4 (fr
Inventor
Akira Ishibashi
Takuya Matsuda
Takashi Okazaki
Atsushi Mochizuki
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication of EP2980516A4 publication Critical patent/EP2980516A4/fr
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    • 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
    • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
    • 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
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
    • F28D1/0435—Combination of units extending one behind the other
    • 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
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • F28D1/0461—Combination of different types of heat exchanger, e.g. radiator combined with tube-and-shell heat exchanger; Arrangement of conduits for heat exchange between at least two media and for heat exchange between at least one medium and the large body of fluid
    • 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
    • F28D1/0477—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 being bent in a serpentine or zig-zag
    • 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
    • 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

Definitions

  • the present invention relates to a heat exchanger and a refrigeration cycle air-conditioning apparatus using the heat exchanger.
  • Heat exchangers often have a problem of degradation in heat exchanging capacity caused by frost formation.
  • a heat exchanger disclosed in Patent Literature 1 is exemplified.
  • heat exchange units are separated from each other in a front-and-back direction and arranged so as to overlap each other in the front-and-back direction.
  • a gap is secured between the pair of heat exchange units and between a pair of header portions arranged above or below the heat exchange units.
  • JP2010002102A discloses a heat exchange unit provided with a first fin and tube type heat exchanger and the second parallel flow type heat exchanger the second serpentine type heat exchanger.
  • the first heat exchanger is arranged windward and the second heat exchanger is arranged leeward in an air current generated by an air blower.
  • JP2002013840A discloses a back side core disposed on the back face of a parallel flow type front side core and refrigerant passed through the front side core is introduced to the back side core.
  • JP2000329486A discloses a finned heat exchanger comprising an auxiliary heat exchanger and a main heat exchanger juxtaposed from the gas inlet side to the gas outlet side.
  • the row of heating tube group on the gas inlet side is separated from a plurality of rows of heating tube group on the gas outlet side.
  • Step pitch of the heating tube group on the gas inlet side is set smaller than the step pitch of the heating tube group on the gas outlet side and the number of heating tubes in a row is set lower on the gas inlet side than on the gas outlet side. Since increase in the heat transfer area and the pressure loss is suppressed in the heating tube on the gas inlet side, a high performance auxiliary heat exchanger is realized.
  • the present invention has been made in view of the above, and has an object to provide a heat exchanger capable of preventing growth of frost accumulated on a lower portion of the heat exchanger.
  • a heat exchanger including: a parallel-flow-type heat exchange unit including a plurality of heat exchange pipes each extending in an up-and-down direction, the parallel-flow-type heat exchange unit including at least a front row portion and a back row portion, the front row portion and the back row portion each including the plurality of heat exchange pipes each extending in the up-and-down direction; and a plate fin-and-tube-type heat exchange unit being arranged in front of a lower portion of a front surface of the parallel-flow-type heat exchange unit, the plate fin-and-tube-type heat exchange unit including a plurality of plate fins each extending in the up-and-down direction, in which an outlet end of the plate fin-and-tube-type heat exchange unit and an inlet end of the parallel-flow-type heat exchange unit are connected to each other by a pipe.
  • FIG. 2 An up-and-down direction of the drawing sheet of FIG. 2 corresponds to the up-and-down direction defined in this specification.
  • a left side and a right side of the drawing sheet of FIG. 2 correspond to the front side and the back side, respectively.
  • a direction along front and back sides of the drawing sheet of FIG. 2 corresponds to the lateral direction.
  • reference symbol WD in FIG. 2 denotes an air direction in ventilation.
  • FIG. 1 and FIG. 2 are a front view and a side view of a heat exchanger according to a first embodiment of the present invention, respectively.
  • a heat exchanger 1 is an aluminum heat exchanger for use in an outdoor unit of a refrigeration cycle air-conditioning apparatus.
  • the heat exchanger 1 includes a parallel-flow-type heat exchange unit 3.
  • a plate fin-and-tube-type heat exchange unit 5 is arranged in front of the parallel-flow-type heat exchange unit 3 of the heat exchanger 1.
  • the parallel-flow-type heat exchange unit 3 includes a front row portion 7 and a back row portion 9 separated from each other in the front-and-back direction and aligned in the front-and-back direction.
  • the front row portion 7 and the back row portion 9 respectively include a plurality of heat exchange pipes 11 and a plurality of heat exchange pipes 13 extending in the up-and-down direction.
  • the heat exchange pipes 11 and 13 are flat pipes each having a shape flattened from the lateral direction.
  • the plurality of heat exchange pipes 11 of the front row portion 7 are aligned in the lateral direction, and the plurality of heat exchange pipes 13 of the back row portion 9 are also aligned in the lateral direction.
  • a gap 15 is secured between the plurality of heat exchange pipes 11 of the front row portion 7 and the plurality of heat exchange pipes 13 of the back row portion 9 in the front-and-back direction, and the heat exchange pipes 11 and the heat exchange pipes 13 are separated from each other in the front-and-back direction.
  • the number of the heat exchange pipes 11 is equal to the number of the heat exchange pipes 13, which is merely an example.
  • Fins 17 are arranged between the plurality of heat exchange pipes 11 and 13.
  • the fins 17 are corrugated fins, and each of the fins 17 extends in the up-and-down direction while meandering laterally between a pair of adjacent fins.
  • each of the fins 17 is formed into a corrugated shape so as to be alternately held in contact with the left heat exchange pipe and the right heat exchange pipe.
  • the heat exchange pipes 11 and 13 are arranged in two rows in the fore-and-after direction, whereas the fins 17 are arranged in one row in the front-and-back direction. That is, one piece of the corrugated fins is positioned between a corresponding pair of the heat exchange pipes 11 of the front row portion 7, and also positioned between a corresponding pair of the heat exchange pipes 13 of the back row portion 9.
  • the fins 17 protrude windward from the heat exchange pipes 11 of the front row portion 7. That is, front edge portions of the fins 17 are positioned forward of front ends of the heat exchange pipes 11 of the front row portion 7.
  • An inlet header 19 serving as a lower header on the front row portion 7 side is arranged below the front row portion 7, and an outlet header 21 serving as a lower header on the back row portion 9 side is arranged below the back row portion 9.
  • a row straddling header 23 is arranged above the front row portion 7 and the back row portion 9. The front row portion 7 and the back row portion 9 share the same row straddling header 23 as an upper header.
  • the inlet header 19, the outlet header 21, and the row straddling header 23 each have one chamber.
  • the lower headers are arranged separately for the respective rows of the front row portion 7 and the back row portion 9, and the upper header is integrally arranged for the front row portion 7 and the back row portion 9 in a row straddling manner.
  • the inlet header 19 and the outlet header 21 arranged below the parallel-flow-type heat exchange unit 3 have a mechanism for attaining uniform distribution to the heat exchange pipes in a windward-side row, and have a mechanism for concentrating gas in a leeward-side row.
  • the parallel-flow-type heat exchange unit 3 When the parallel-flow-type heat exchange unit 3 is seen as a whole, the lower headers are arranged separately for the respective rows.
  • the row straddling header 23 arranged above the parallel-flow-type heat exchange unit 3 has a mechanism for enabling refrigerant to move between the rows.
  • the upper header is integrally arranged for the two rows.
  • Lower ends of the heat exchange pipes 11 of the front row portion 7 are connected to the inlet header 19, and upper ends of the heat exchange pipes 11 of the front row portion 7 are connected to the row straddling header 23. Further, lower ends of the heat exchange pipes 13 of the back row portion 9 are connected to the outlet header 21, and upper ends of the heat exchange pipes 13 of the back row portion 9 are connected to the row straddling header 23.
  • the plate fin-and-tube-type heat exchange unit 5 is arranged in front of a lower portion of a front surface of the parallel-flow-type heat exchange unit 3. More specifically, the plate fin-and-tube-type heat exchange unit 5 is arranged in front of the lower portion of the front surface of the front row portion 7 and above the inlet header 19. A lowermost portion of the plate fin-and-tube-type heat exchange unit 5 (lowermost portions of plate fins 25) is positioned between lowermost portions of the fins 17 of the parallel-flow-type heat exchange unit 3 and the inlet header 19.
  • the plate fin-and-tube-type heat exchange unit 5 includes the plurality of plate fins 25 and a heat transfer pipe 27 for forming at least one passage.
  • the plurality of plate fins 25 extend in the up-and-down direction, and are aligned substantially in parallel to each other in the lateral direction. Further, back portions of the plurality of plate fins 25 are held in abutment on or close to front ends of lower portions of the fins 17 of the parallel-flow-type heat exchange unit 3.
  • the heat transfer pipe 27 is a circular pipe forming one passage, and extends in the up-and-down direction through the plurality of plate fins 25 while meandering in the lateral direction.
  • a plurality of circular pipes may be employed to form a plurality of passages as long as the number of the circular pipes is smaller than the number of passages of the parallel-flow-type heat exchange unit 3.
  • one or the plurality of circular pipes (of a plate fin and circular tube type)
  • one or a plurality of flat pipes (of a plate fin and flat tube type) may be employed as the heat transfer pipe 27.
  • connection pipe 29 The plate fin-and-tube-type heat exchange unit 5 and the parallel-flow-type heat exchange unit 3 are connected to each other by a connection pipe 29. That is, one end of the connection pipe 29 is connected to the outlet end 27b of the heat transfer pipe 27 of the plate fin-and-tube-type heat exchange unit 5, and another end of the connection pipe 29 is connected to an inlet end 19a of the inlet header 19 of the parallel-flow-type heat exchange unit 3.
  • FIG. 1 and FIG. 2 schematically indicate the flow of the refrigerant when the heat exchanger 1 functions as the evaporator. Therefore, when the heat exchanger 1 functions as a condenser, the refrigerant flows in a direction reverse to the direction indicated by the arrows.
  • the heat exchanger 1 is used as the evaporator (for example, when the heat exchanger 1 is arranged in the outdoor unit and performs heating operation)
  • the refrigerant flows through one passage in the plate fin-and-tube-type heat exchange unit 5 upward from below, and then flows out of the plate fin-and-tube-type heat exchange unit 5.
  • the refrigerant flows into the inlet header 19 of the parallel-flow-type heat exchange unit 3.
  • the refrigerant in the inlet header 19 flows upward from below in the plurality of heat exchange pipes 11 of the front row portion 7 located on the windward side. That is, the refrigerant flows upward in the front row portion 7 while dividing into the same number of passages as the number of the heat exchange pipes 11, and then flows into the row straddling header 23.
  • the refrigerant further flows downward from above in the plurality of heat exchange pipes 13 of the back row portion 9 located on the leeward side. That is, after flowing downward in the back row portion 9 while dividing into the same number of passages as the number of the heat exchange pipes 13, the refrigerant flows into the outlet header 21, and finally flows out of the heat exchanger 1 .
  • the heat exchanger 1 includes the plate fin-and-tube-type heat exchange unit 5, and hence condensed water is led to the plate fins 25 from the inlet header 19 and the fins 17 at the time of operation that may cause frost formation.
  • the condensed water is mainly concentrated on the plate fin-and-tube-type heat exchange unit 5 having a good draining property, thereby being capable of preventing accumulation of ice on the lower portion of the heat exchanger 1.
  • the number of passages of the plate fin-and-tube-type heat exchange unit 5 is smaller than the number of passages of the parallel-flow-type heat exchange unit 3, and a pressure loss in the pipes, through which the refrigerant passes, is larger in the plate fin-and-tube-type heat exchange unit 5 than in the parallel-flow-type heat exchange unit 3. Accordingly, an evaporating temperature in the plate fin-and-tube-type heat exchange unit 5 is higher than an evaporating temperature in the parallel-flow-type heat exchange unit 3, and an amount of frost formed at the time of operation is reduced. Thus, it is possible to prevent concentration of frost on the lower portion of the heat exchanger 1. Further, when the heat exchanger 1 is used as the condenser, a flow rate in a subcooled portion can be increased, and a heat transfer coefficient in the pipes can be increased, thereby increasing an efficiency of the heat exchanger.
  • the heat exchanger 1 when used as the evaporator, an inlet of the plate fin-and-tube-type heat exchange unit 5 is formed in the lowermost portion of the plate fin-and-tube-type heat exchange unit 5, and hence a temperature of a lowermost portion of the heat exchanger 1 can be increased. Also with this, the frost formation amount can be suppressed.
  • the fins 17 for use in the parallel-flow-type heat exchange unit 3 are formed integrally with the heat exchange pipes 11 and 13 arranged in front and back two rows. Accordingly, when the heat exchange pipes 11 and 13 are laid out in the front and back two rows so that the rows are parallel to each other, assembling properties of the heat exchange pipes can be enhanced.
  • notches for blocking heat are formed in regions of the fins 17 between the front and back rows.
  • the fins 17 are fixed so as to protrude windward from the heat exchange pipes 11.
  • a temperature of the front edge portions of the fins 17 is approximated to the air temperature, thereby being capable of avoiding concentration of frost on the front edge portions of the fins 17 at the time of operation that may cause frost formation.
  • a heat exchanging method using the heat exchanger 1 can be exemplified as the first embodiment.
  • the heat exchanging method when the heat exchanger 1 functions as the evaporator, the refrigerant and the air flow substantially in parallel to each other (flow in the same direction) (both the refrigerant and the air flow from the front side to the back side as seen in broad perspective). Further, the evaporating temperature of the refrigerant is reduced due to the pressure loss toward a flowing direction of the refrigerant, and the temperature of the air is also reduced toward a flowing direction of the air. Accordingly, a temperature difference between the refrigerant and the air is reduced.
  • the heat exchanger 1 functions as the condenser
  • the refrigerant and the air flow in a substantially opposing manner (flow in opposite directions)
  • the air flows from the front side to the back side, whereas the refrigerant flows from the back side to the front side as seen in broad perspective.
  • the temperature of the refrigerant is reduced in a superheated region, a two-phase region, and a subcooled region toward the flowing direction of refrigerant, whereas the temperature of the air is increased toward the flowing direction of the air. Accordingly, the temperature difference between the refrigerant and the air is reduced. Also in this manner, the efficiency of the heat exchanger is increased.
  • the heat exchanger 1 has a refrigerant passage allowing the refrigerant and the air to flow in the same direction along the front-and-back direction when the heat exchanger 1 functions as the evaporator, and allowing the refrigerant and the air to flow in opposite directions along the front-and-back direction when the heat exchanger 1 functions as the condenser.
  • FIG. 3 and FIG. 4 are views similar to FIG. 1 and FIG. 2 according to the second embodiment.
  • the second embodiment is the same as the above-mentioned first embodiment except formatters described below.
  • priority is placed on description of a connection state of divided areas, and hence illustrations of the pipes are different from an actual state. Accuracy of illustrations of pipe diameters and pipe lengths is ignored, and the divided connection pipes are illustrated in a non-overlapping manner on purpose both in FIG. 3 and FIG. 4 .
  • a heat exchanger 101 according to the second embodiment includes, as the lower header of the windward-side row, an inlet header 119 having an interior partitioned into a plurality of chambers (three chambers as a specific example) by partition walls, and further includes a distributor 131.
  • the distributor 131 is arranged on the downstream side of the plate fin-and-tube-type heat exchange unit 5 and on the upstream side of the parallel-flow-type heat exchange unit 3 when the heat exchanger 101 functions as the evaporator. More specifically, the inlet header 119 has inlet ends 119a for the plurality of respective chambers.
  • the outlet end 27b of the heat transfer pipe 27 of the plate fin-and-tube-type heat exchange unit 5 and the distributor 131 are connected to each other by one collective connection pipe 129a, and each of the plurality of (three) inlet ends 119a of the inlet header 119 and the distributor 131 are connected to each other by corresponding one of the plurality of (three) divided connection pipes 129b.
  • the divided connection pipes 129b function as capillary tubes. Note that, at least a front row side of a row straddling header 123 is also partitioned into a plurality of (three) regions so as to correspond to the inlet header 119.
  • the refrigerant when the heat exchanger 101 functions as the evaporator, the refrigerant is divided into three passages by the distributor 131 after flowing out of the plate fin-and-tube-type heat exchange unit 5, and flows into the three chambers of the inlet header 119 located below the windward-side row of the parallel-flow-type heat exchange unit 3. Then, the refrigerant flows upward in the heat exchange pipes 11, and moves from one row to another row through the row straddling header 123. After flowing downward in the heat exchange pipes 13, the refrigerant flows out of the outlet header 21 of the leeward-side row.
  • the interior of the header which is arranged below the windward-side row of the parallel-flow-type heat exchange unit 3, is partitioned into the three chambers, thereby reducing sizes of the respective chambers in the header.
  • distribution of the refrigerant in the header can be adjusted easily.
  • the refrigerant can be distributed uniformly.
  • a pressure loss in the pipes is large in the distributor and the capillary tubes. Accordingly, when the heat exchanger 101 functions as the evaporator, the evaporating temperature in the plate fin-and-tube-type heat exchange unit can be increased, and growth of frost on the lower portion of the heat exchanger can be prevented.
  • FIG. 5 is a schematic view of the refrigeration cycle air-conditioning apparatus according to the third embodiment.
  • FIG. 6 is a schematic plan view of an outdoor unit of the refrigeration cycle air-conditioning apparatus according to the third embodiment.
  • a refrigeration cycle air-conditioning apparatus 251 includes a refrigeration cycle circuit including at least a compressor 253, an outdoor heat exchanger 255, an expansion device (expansion valve) 257, and an indoor heat exchanger 259. Note that, the arrow illustrated in FIG. 5 indicates the flowing direction of the refrigerant when cooling operation is performed. Further, the refrigeration cycle air-conditioning apparatus 251 includes a fan 261 for blowing the air to each of the outdoor heat exchanger 255 and the indoor heat exchanger 259, and a drive motor 263 for rotating the fan 261.
  • An interior of a casing of an outdoor unit 351 of the refrigeration cycle air-conditioning apparatus 251 is partitioned by a partition plate 365 into a machine chamber 367 and an air-blowing chamber 369.
  • the compressor 253 is received in the machine chamber 367, and the outdoor heat exchanger 255 and the fan 261 are received in the air-blowing chamber 369.
  • the heat exchanger 1 according to the first embodiment or the heat exchanger 101 according to the second embodiment is used as one of or both of the outdoor heat exchanger 255 and the indoor heat exchanger 259.
  • the refrigeration cycle air-conditioning apparatus with high energy efficiency can be realized.
  • the small number of pipes are arranged at each end in the lateral direction, and the heat exchanger (parallel-flow-type heat exchange unit) can be arranged on a substantially entire surface of the casing on the windward side of the fan of the outdoor unit. Accordingly, a satisfactory mounting area can be secured without bending the heat exchanger. Also with this, there is attained an advantage in that heat exchanging efficiency can be increased.
  • the heat exchanger (parallel-flow-type heat exchange unit) can be arranged on a substantially entire surface of a casing on a windward side of the fan of the indoor unit, and the same advantage can be attained.
  • the heat exchanger 1 and the heat exchanger 101 described in the first and second embodiments, and the refrigeration cycle air-conditioning apparatus 251 using the heat exchanger can achieve the above-mentioned effects when using refrigerant such as R410A, R32, or HFO1234yf.
  • air and the refrigerant are exemplified as an operating fluid.
  • the same effects can be attained even when other kinds of gas, liquid, and gas-liquid mixture fluids are used.
  • the heat exchanger 1 and the heat exchanger 101 described in the first and second embodiments can attain the same effects even when used in the indoor unit.
  • the heat exchanger 1 and the heat exchanger 101 described in the first and second embodiments, and the refrigeration cycle air-conditioning apparatus 251 using the heat exchanger can achieve the above-mentioned effects even when using any kinds of refrigerating machine oils such as mineral oil-based, alkylbenzene oil-based, ester oil-based, ether oil-based, and fluorine oil-based lubricants irrespective of whether or not the oils dissolve in the refrigerant.
  • refrigerating machine oils such as mineral oil-based, alkylbenzene oil-based, ester oil-based, ether oil-based, and fluorine oil-based lubricants irrespective of whether or not the oils dissolve in the refrigerant.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Other Air-Conditioning Systems (AREA)

Claims (9)

  1. Echangeur de chaleur comprenant :
    une unité d'échange de chaleur de type à écoulement parallèle (3) comprenant une pluralité de tuyaux d'échange de chaleur (11, 13) s'étendant chacun dans une direction ascendante et descendante,
    l'unité d'échange de chaleur de type à écoulement parallèle (3) comprenant au moins une partie de rangée avant (7) et une partie de rangée arrière (9),
    la partie de rangée avant (7) et la partie de rangée arrière (9) comprenant chacune la pluralité de tuyaux d'échange de chaleur (11, 13) s'étendant chacun dans la direction ascendante et descendante ;
    des ailettes (17) de l'unité d'échange de chaleur de type à écoulement parallèle (3) faisant saillie vers l'avant à partir des tuyaux d'échange de chaleur (11) de la partie de rangée avant (7) ; et
    une unité d'échange de chaleur de type à ailette à plaque et tube (5) étant agencée uniquement en face d'une partie inférieure d'une surface avant de l'unité d'échange de chaleur de type à écoulement parallèle (3),
    l'unité d'échange de chaleur de type à ailette à plaque et tube (5) comprenant une pluralité d'ailettes à plaque (25) s'étendant chacune dans la direction ascendante et descendante,
    dans lequel une extrémité de sortie de l'unité d'échange de chaleur de type à ailette à plaque et tube (5) et une extrémité d'entrée de l'unité d'échange de chaleur de type à écoulement parallèle (3) sont raccordées entre elles par un tuyau, et
    la pluralité d'ailettes à plaque (25) sont maintenues en butée ou à proximité des extrémités avant des ailettes (17) de l'unité d'échange de chaleur de type à écoulement parallèle (3).
  2. Echangeur de chaleur selon la revendication 1, dans lequel la partie la plus basse de l'unité d'échange de chaleur de type à ailette à plaque et tube (5) est positionnée entre la partie la plus basse de chacune des ailettes de l'unité d'échange de chaleur de type à écoulement parallèle (3) et un collecteur inférieur de la partie de rangée avant.
  3. Echangeur de chaleur selon la revendication 1 ou 2, dans lequel un tuyau circulaire est utilisé en tant que tuyau de transfert de chaleur de l'unité d'échange de chaleur de type à ailette à plaque et tube (5).
  4. Echangeur de chaleur selon l'une quelconque des revendications 1 à 3, dans lequel un certain nombre de passages de l'unité d'échange de chaleur de type à ailette à plaque et tube (5) est inférieur à un nombre de passages de l'unité d'échange de chaleur de type à écoulement parallèle (3).
  5. Echangeur de chaleur selon l'une quelconque des revendications 1 à 4, dans lequel une extrémité d'entrée du tuyau de transfert de chaleur servant d'entrée de réfrigérant lorsque l'échangeur de chaleur fonctionne en tant qu'évaporateur, est agencée dans une partie inférieure de chacune des ailettes à plaque.
  6. Echangeur de chaleur selon l'une quelconque des revendications 1 à 5, dans lequel l'échangeur de chaleur a un passage de réfrigérant pour permettre au réfrigérant et à l'air de s'écouler dans la même direction le long d'une direction avant et arrière, lorsque l'échangeur de chaleur fonctionne en tant qu'évaporateur, et pour permettre au réfrigérant et à l'air de s'écouler dans des directions opposées le long de la direction avant et arrière lorsque l'échangeur de chaleur fonctionne en tant que condensateur.
  7. Echangeur de chaleur selon l'une quelconque des revendications 1 à 6,
    dans lequel un intérieur du collecteur inférieur (119) de la partie de rangée avant (7) est séparé par une paroi de séparation en une pluralité de chambres,
    dans lequel le collecteur inférieur (119) a des extrémités d'entrée pour la pluralité de chambres,
    dans lequel un distributeur (131) est agencé entre l'unité d'échange de chaleur de type à ailette à plaque et tube (5) et le collecteur inférieur (119) de la partie de rangée avant (7),
    dans lequel une extrémité de sortie de l'unité d'échange de chaleur de type à ailette à plaque et tube (5) et le distributeur (131) sont raccordés entre eux par un tuyau de raccordement collectif (129a), et
    dans lequel chacune de la pluralité d'extrémités d'entrée du collecteur inférieur (119) et le distributeur (131) sont raccordés entre eux par un tuyau correspondant d'une pluralité de tuyaux de raccordement (129b) divisés.
  8. Appareil de conditionnement d'air par cycle de réfrigération, comprenant un circuit de cycle de réfrigération comprenant un compresseur (253), un échangeur de chaleur extérieur (255), une valve d'expansion (257), et un échangeur de chaleur intérieur (259),
    dans lequel l'un ou les deux parmi l'échangeur de chaleur extérieur (255) et l'échangeur de chaleur intérieur (259) est un échangeur de chaleur selon l'une quelconque des revendications 1 à 7.
  9. Appareil de conditionnement d'air par cycle de réfrigération selon la revendication 8,
    dans lequel les ailettes de l'unité d'échange de chaleur de type à écoulement parallèle (3) comprennent des ailettes ondulées, et
    dans lequel l'unité d'échange de chaleur de type à écoulement parallèle (3) est agencée sur toute une surface d'un boîtier d'un côté au vent d'un ventilateur de l'échangeur correspondant parmi l'échangeur de chaleur extérieur (255) et l'échangeur de chaleur intérieur (259).
EP13880586.6A 2013-03-27 2013-03-27 Échangeur de chaleur et conditionneur d'air à cycle de réfrigération l'utilisant Active EP2980516B1 (fr)

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PCT/JP2013/058995 WO2014155560A1 (fr) 2013-03-27 2013-03-27 Échangeur de chaleur et conditionneur d'air à cycle de réfrigération l'utilisant

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AU2018431665B2 (en) 2018-07-11 2022-06-02 Mitsubishi Electric Corporation Heat exchanger, heat exchanger unit, and refrigeration cycle apparatus
JP6765144B1 (ja) * 2019-07-18 2020-10-07 株式会社 エコファクトリー 換気空調構造

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JP3214278B2 (ja) 1995-02-22 2001-10-02 株式会社デンソー 空調装置
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Also Published As

Publication number Publication date
EP2980516A1 (fr) 2016-02-03
WO2014155560A1 (fr) 2014-10-02
JPWO2014155560A1 (ja) 2017-02-16
CN203798027U (zh) 2014-08-27
JP6157593B2 (ja) 2017-07-05
EP2980516A4 (fr) 2016-12-07

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