EP1757869A2 - Echangeur de chaleur pour dispositif de conditionnement d'air avec différents circuits selon leurs distance au ventilateur - Google Patents

Echangeur de chaleur pour dispositif de conditionnement d'air avec différents circuits selon leurs distance au ventilateur Download PDF

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Publication number
EP1757869A2
EP1757869A2 EP06017726A EP06017726A EP1757869A2 EP 1757869 A2 EP1757869 A2 EP 1757869A2 EP 06017726 A EP06017726 A EP 06017726A EP 06017726 A EP06017726 A EP 06017726A EP 1757869 A2 EP1757869 A2 EP 1757869A2
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
circuits
fan
air conditioner
air
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.)
Withdrawn
Application number
EP06017726A
Other languages
German (de)
English (en)
Other versions
EP1757869A3 (fr
Inventor
Woo-Ho Cha
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.)
LS Mtron Ltd
Original Assignee
LS Cable Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LS Cable Ltd filed Critical LS Cable Ltd
Publication of EP1757869A2 publication Critical patent/EP1757869A2/fr
Publication of EP1757869A3 publication Critical patent/EP1757869A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • 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
    • 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
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
    • 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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/08—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels

Definitions

  • the present invention relates to a heat exchanger for an air conditioner, and more particularly to a heat exchanger comprising a plurality of circuits having different path lengths depending on distances from a fan.
  • an air conditioner maintains a temperature in a room to be a proper temperature irrespective of external temperatures through a refrigeration cycle or heat pump cycle, and is provided with a heat exchanger allowing the refrigerant to pass through therein to exchange the heat with the ambient air.
  • the air conditioner consists of an indoor heat exchanger, a compressor, an outdoor heat exchanger and an expansion valve.
  • the indoor heat exchanger serves as an evaporator and the outdoor heat exchanger serves as a condenser, so that as the refrigerant under liquid state of low temperature and pressure passes through the indoor heat exchanger, it absorbs the heat in the room and is thus evaporated, thereby implementing the cooling effect.
  • the indoor heat exchanger serves as the condenser and the outdoor heat exchanger serves as the evaporator, so that as the refrigerant under gas state of high temperature and pressure discharged from the compressor passes through the indoor heat exchanger, it radiates the heat into the room, thereby implementing the heating effect.
  • the heat exchanger is typically comprised of plural circuits through which the refrigerant passes.
  • Each of the circuits consists of straight tubes and bended connection tubes connecting the straight tubes.
  • An end of the respective circuits is connected to a header and the other end is connected to a distributor, so that the refrigerant is circulated in the circuits to carry out the heat exchange.
  • Fig. 1 is a perspective view showing a prior heat exchanger.
  • the heat exchanger 100 has an arrangement in which plural tubes 110 are arranged in a line with two rows.
  • the tubes 110 are connected via connection tubes 115.
  • the arrangement of the tubes 110 is divided into plural circuits 120a - 120f.
  • the refrigerant is circulated in the circuits 120a ⁇ 120f through the tubes 110 constituting both ends of the respective circuits 120a ⁇ 120f.
  • the tubes 110 of the respective circuits 120a ⁇ 120f are arranged in same number and pattern.
  • the path lengths of the respective circuits 120a ⁇ 120f are same, so that areas of heat contact between the respective circuits 120a ⁇ 120f and the ambient air are also same.
  • the distributions of the air volume and the wind speed at the respective parts of the heat exchanger are different depending on the positions of the fan. Accordingly, if the respective circuits are formed into the same pattern (same path lengths) without considering the differences of the air volume and the wind speed depending on the positions of the fan, as the prior heat exchanger, an efficiency of the heat exchange is decreased.
  • An object of the invention is to provide a heat exchanger capable of increasing an efficiency of the heat exchange by making tube patterns of plural circuits constituting a heat exchanger different, correspondingly to the difference of the air volume and the wind speed depending on distances from the fan.
  • a heat exchanger for an air conditioner having plural circuits through which refrigerant passes, wherein the circuits are formed into different patterns to have path lengths different from each other and have a shorter path length as the circuits are closer to a fan generating an air flow.
  • each of the circuits may consist of plural straight tubes and bended return bands connecting the straight tubes.
  • the circuits have smaller number of the straight tubes as they are closer to the fan.
  • the circuits of the heat exchanger may form 2 to 4 circuit groups depending on the patterns thereof.
  • Each of the circuit groups may consist of circuits of one or two patterns.
  • the circuits of the heat exchanger may be formed with two circuit groups and a ratio of the number of the tubes in the two circuit groups may be 7:10 to 9:10.
  • the circuits may be vertically arranged, the fan may be placed at an upper part of the heat exchanger so that the air passing through the heat exchanger flows upwardly, and the number of the tubes arranged at the upper part of the heat exchanger is smaller than that of the circuits arranged in a lower part of the heat exchanger.
  • Fig. 2 is a view schematically showing an air conditioner provided with a heat exchanger according to an embodiment of the invention.
  • Figs. 3A to 3C are perspective views showing circuits of a heat exchanger according to an embodiment of the invention.
  • the air conditioner shown in Fig. 2 is an air conditioner having a combined heating/cooling function capable of selectively performing the heating/cooling in a room.
  • a structure of the air conditioner based on the cooling operation.
  • the air conditioner comprises an outdoor unit 10 and an indoor unit 20.
  • the indoor unit 20 comprises an indoor heat exchanger 21 for a heat exchange between the refrigerant and the indoor air, a compressor 40 for compressing the refrigerant, and an expansion valve 70 for expanding the refrigerant so as to decrease pressure and temperature thereof.
  • the outdoor unit 10 comprises a plurality of outdoor heat exchangers 11 for a heat exchange between the refrigerant and the outdoor air, headers 60, 60 for supplying the refrigerant to the outdoor heat exchangers 11, a distributor 30 for recovering the refrigerant flowing from the outdoor heat exchangers 11 to circulate it into the indoor unit 20 and a fan 80 for assisting the heat exchange in the outdoor heat exchangers 11.
  • the indoor unit 20 is provided with a 4-way valve 30 for selectively changing the refrigerant flowing direction from an inlet and an outlet of the compressor 40 to the outdoor heat exchangers 11 and the indoor heat exchanger 21.
  • a separate fan may be also provided to the indoor unit 10 for the heat exchange in the indoor heat exchanger 21 .
  • Each of the outdoor heat exchangers 11 is provided with plural circuits 50 which are vertically arranged in a line.
  • Each of the circuits 50 consists of plural straight tubes and bended return bands for connecting the straight tubes, thereby forming a single refrigerant passage.
  • the refrigerant is distributed from the header 60 and introduced into the respective circuits 50.
  • the refrigerant having passed through the respective circuits 50 is collected through the distributor 40 and flows toward the expansion valve 70.
  • the pair of the outdoor heat exchangers 11 is symmetrically arranged at the right and left sides about any vertical axis.
  • the fan 80 is placed at an upper part of the outdoor unit 10 between the outdoor heat exchangers 11 to discharge the circulating air in the outdoor unit 10 to the exterior.
  • the arrangements of the fan 80 and the outdoor heat exchangers 11 are not limited to the embodiment and can be modified into a variety of types.
  • the indoor heat exchanger 21 serves as an evaporator and the outdoor heat exchanger 11 serves as a condenser.
  • the refrigerant which is compressed to high temperature and pressure by the compressor 40, is delivered to the outdoor heat exchanger 11 through a conduit 5 under gas state.
  • the gas refrigerant under high temperature and pressure is cooled and condensed by the heat exchange with the outdoor air in the outdoor heat exchanger 11, so that it becomes liquid under low temperature and high pressure.
  • the liquid refrigerant is decompressed to be the liquid under low temperature and pressure while passing through the expansion valve 70 and is delivered to the indoor heat exchanger 21.
  • the refrigerant delivered to the indoor heat exchanger 21 is evaporated through the heat exchange with the indoor air to cool the room, converted into the gas refrigerant under medium temperature and low pressure and then flows in the compressor 40.
  • the outdoor heat exchanger 11 serves as an evaporator
  • the indoor heat exchanger 12 serves as a condenser and the flow of the refrigerant is opposite to that of the cooling operation.
  • each of the outdoor heat exchangers 11 is provided with fourteen circuits 50.
  • the structures of the two upper circuits and the 12 lower circuits 52, 53 are designed to be different from each other, thereby forming a circuit group.
  • the fan 80 of the embodiment is placed at the upper part of the outdoor unit 10 above the outdoor heat exchangers 11, thereby blowing the circulating air in the outdoor unit 10 to the exterior.
  • the amount and velocity of the flowing air are increased, as it is closer to the fan 80 in the outdoor unit 10.
  • the amounts and velocity of the air flowing at the lower and upper parts of the outdoor heat exchangers 11 are different depending on the distances from the fan 80.
  • the two circuits 51 having a pattern of a small area of heat contact due to the short flow path length of the refrigerant are placed at the upper part of the outdoor heat exchangers 11, and the circuits 52, 53 having a pattern of a large area of heat contact due to the relatively long flow path length of the refrigerant are placed at the lower part thereof.
  • the two upper circuits 51 has a structure as shown in Fig. 3A and the twelve lower circuits 52, 53 have structures as shown in Figs. 3B and 3C.
  • the twelve lower circuits form a circuit group in which the two circuits 52, 53 thereof are repeated with a pair (i.e., total 6 pairs).
  • Such arrangement of the circuits 50 is an example for patterning the circuits 50 and thus facilitating the mass production and the invention is not limited thereto.
  • the shapes of the circuits 51, 52, 53 shown in Fig. 2 are sectional shapes taken along a line d-d' in Figs. 3A to 3C.
  • the two upper circuits 51 consist of eight straight tubes.
  • the lower circuits 52, 53 consist of 10 straight tubes and the circuit 52 and the circuit 53 form a pattern symmetrical to each other. Since the straight tubes constituting the respective circuits 51, 52, 53 have a same length, a whole path length of the upper circuit 51 is smaller than that of the lower circuits 52, 53. Accordingly, the area of heat contact at the circuit 51 is smaller than that of the circuits 52, 53.
  • the circuits 50 of the outdoor heat exchanger 11 can be divided into 2 to 4 circuit groups depending on the patterns.
  • it can be divided into two circuit groups, i.e., a first circuit group comprising the two circuits 51 arranged at the upper part of the outdoor heat exchangers 11 close to the fan 80 and a second circuit group comprising the two types of circuits 52, 53 arranged at the lower part of the outdoor heat exchangers 11.
  • the respective circuit groups are arranged into a pattern of one circuit 51 and a pattern of the two circuits 52, 53.
  • a ratio of the number of the straight tubes in the two circuit groups may be 7:10 to 9:10. As described above, in the embodiment, the ratio of the number of the straight tubes in the first and second circuit groups is 8:10.
  • the entire area of heat contact of the heat exchangers 11, 21 should be large so as to efficiently exchange the heat.
  • the path length of the circuit 50 of the heat exchangers 11, 21 should be large so as to increase the area of heat contact, the sizes of the heat exchangers 11, 21 become large. As a result, the air flow space in the indoor unit 20 or outdoor unit 10 is decreased. Accordingly, it is not desirable, regarding the general efficiency improvement of the air conditioner.
  • Fig. 4 is a graph comparing temperature distributions in the outdoor heat exchanger 11 of the invention and the prior heat exchanger.
  • the outdoor heat exchanger having the circuit patterns (different patterns) according to the invention it is possible to lower the temperature distribution at the respective parts of the heat exchanger by 1 °C, as compared to the prior heat exchanger having an equal circuit pattern (i.e., pattern consisting of the same number of tubes per a circuit).
  • the prior heat exchanger having an equal circuit pattern (i.e., pattern consisting of the same number of tubes per a circuit).
  • the condensing temperature is dropped during the cooling operation, so that the overall efficiency of the air conditioner is increased.
  • the path lengths of the circuits constituting the heat exchanger are made to be different depending on the distances from the fan. Accordingly, it is possible to improve the efficiency of the heat exchange of the heat exchanger and the overall efficiency of the air conditioner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
EP06017726A 2005-08-26 2006-08-25 Echangeur de chaleur pour dispositif de conditionnement d'air avec différents circuits selon leurs distance au ventilateur Withdrawn EP1757869A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020050078570A KR100631273B1 (ko) 2005-08-26 2005-08-26 송풍 팬과의 거리차에 따라 서킷의 패턴이 다른 열교환기를구비한 공기 조화기

Publications (2)

Publication Number Publication Date
EP1757869A2 true EP1757869A2 (fr) 2007-02-28
EP1757869A3 EP1757869A3 (fr) 2007-12-26

Family

ID=37309694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06017726A Withdrawn EP1757869A3 (fr) 2005-08-26 2006-08-25 Echangeur de chaleur pour dispositif de conditionnement d'air avec différents circuits selon leurs distance au ventilateur

Country Status (4)

Country Link
EP (1) EP1757869A3 (fr)
KR (1) KR100631273B1 (fr)
CN (1) CN1940398A (fr)
AU (1) AU2006203362A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011099255A1 (fr) * 2010-02-15 2011-08-18 ダイキン工業株式会社 Appareil de conditionnement d'air
EP2916086A1 (fr) * 2014-03-07 2015-09-09 Mitsubishi Heavy Industries, Ltd. Échangeur de chaleur et climatiseur comprenant celui-ci
JP2016109382A (ja) * 2014-12-09 2016-06-20 株式会社デンソー 熱交換器及び室外機
US10508862B2 (en) 2013-03-15 2019-12-17 Carrier Corporation Heat exchanger for air-cooled chiller

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100813711B1 (ko) * 2006-11-16 2008-03-13 엘지전자 주식회사 공기 조화기 및 그 열교환기
KR100834005B1 (ko) * 2007-03-29 2008-05-30 삼양에코너지 주식회사 지열용 수중 열교환기
KR101891615B1 (ko) * 2012-01-20 2018-08-24 엘지전자 주식회사 실외 열교환기
KR101384148B1 (ko) * 2012-07-26 2014-04-10 엘지전자 주식회사 공기조화기 및 공기조화기의 제어방법
CN106766408A (zh) * 2016-12-05 2017-05-31 珠海格力电器股份有限公司 换热装置及应用其的空调器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58129176A (ja) * 1982-01-28 1983-08-02 三菱電機株式会社 空気調和機の室外ユニツト
EP0085381A2 (fr) * 1982-01-29 1983-08-10 Carrier Corporation Circuit d'échangeur de chaleur à ailette enroulée
JPH01118199A (ja) * 1988-04-28 1989-05-10 Kawai Musical Instr Mfg Co Ltd 電子楽器の電源投入時処理方式
JPH03113290A (ja) * 1989-09-27 1991-05-14 Hitachi Ltd 空気側熱交換器
US6672375B1 (en) * 2002-07-02 2004-01-06 American Standard International Inc. Fin tube heat exchanger with divergent tube rows

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980054996U (ko) * 1996-12-31 1998-10-07 오상수 냉장고의 증발기유닛
JPH1123184A (ja) * 1997-06-27 1999-01-26 Nippon Light Metal Co Ltd 熱交換装置
US6382310B1 (en) * 2000-08-15 2002-05-07 American Standard International Inc. Stepped heat exchanger coils

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58129176A (ja) * 1982-01-28 1983-08-02 三菱電機株式会社 空気調和機の室外ユニツト
EP0085381A2 (fr) * 1982-01-29 1983-08-10 Carrier Corporation Circuit d'échangeur de chaleur à ailette enroulée
JPH01118199A (ja) * 1988-04-28 1989-05-10 Kawai Musical Instr Mfg Co Ltd 電子楽器の電源投入時処理方式
JPH03113290A (ja) * 1989-09-27 1991-05-14 Hitachi Ltd 空気側熱交換器
US6672375B1 (en) * 2002-07-02 2004-01-06 American Standard International Inc. Fin tube heat exchanger with divergent tube rows

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011099255A1 (fr) * 2010-02-15 2011-08-18 ダイキン工業株式会社 Appareil de conditionnement d'air
JP2011163740A (ja) * 2010-02-15 2011-08-25 Daikin Industries Ltd 空気調和機
US10508862B2 (en) 2013-03-15 2019-12-17 Carrier Corporation Heat exchanger for air-cooled chiller
EP2916086A1 (fr) * 2014-03-07 2015-09-09 Mitsubishi Heavy Industries, Ltd. Échangeur de chaleur et climatiseur comprenant celui-ci
JP2016109382A (ja) * 2014-12-09 2016-06-20 株式会社デンソー 熱交換器及び室外機

Also Published As

Publication number Publication date
AU2006203362A1 (en) 2007-03-15
EP1757869A3 (fr) 2007-12-26
KR100631273B1 (ko) 2006-10-04
CN1940398A (zh) 2007-04-04

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