US20120125030A1 - Outdoor heat exchanger and heat pump having the same - Google Patents

Outdoor heat exchanger and heat pump having the same Download PDF

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Publication number
US20120125030A1
US20120125030A1 US13/298,335 US201113298335A US2012125030A1 US 20120125030 A1 US20120125030 A1 US 20120125030A1 US 201113298335 A US201113298335 A US 201113298335A US 2012125030 A1 US2012125030 A1 US 2012125030A1
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US
United States
Prior art keywords
heat exchanger
coating material
collar
fins
coated
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.)
Abandoned
Application number
US13/298,335
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English (en)
Inventor
Juhyok Kim
Hongseong KIM
Hanchoon Lee
Sangyeul Lee
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.)
LG Electronics Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Kim, Hongseong, Kim, Juhyok, Lee, Hanchoon, Lee, Sangyeul
Publication of US20120125030A1 publication Critical patent/US20120125030A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F28F13/182—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing especially adapted for evaporator or condenser surfaces
    • 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
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2245/00—Coatings; Surface treatments
    • F28F2245/02—Coatings; Surface treatments hydrophilic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2245/00—Coatings; Surface treatments
    • F28F2245/04—Coatings; Surface treatments hydrophobic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/51—Heat exchange having heat exchange surface treatment, adjunct or enhancement
    • Y10S165/512—Coated heat transfer surface
    • Y10S165/514—Hydrophilic/hydrophobic coating

Definitions

  • This relates to a heat exchanger and a heat pump having the same and, more particularly, to an outdoor heat exchanger including a hydrophilic coating and a water repellent coating, and a heat pump having the same.
  • a heat pump is a device which includes a compressor, a condensation heat exchanger, an expansion mechanism, and an evaporation heat exchanger. Such a heat pump may be used to cool or heat an indoor area and/or to supply hot water.
  • FIG. 1 is a schematic view of a heat pump according to an embodiment as broadly described herein;
  • FIG. 2 is an enlarged view of a section of an outdoor heat exchanger of the heat pump shown in FIG. 1 ;
  • FIG. 3 is a graph of a heating operation duration with a respect to a ratio of hydrophilic coating and water repellent coating of the heat pump shown in FIGS. 1 and 2 ;
  • FIG. 4 is a graph of a defrosting operation duration with respect to a ratio of hydrophilic coating and water repellent coating of the heat pump shown in FIGS. 1 and 2 ;
  • FIG. 5 is an enlarged side view of condensation water generated on a water repellent coated fin of the heat pump shown in FIGS. 1 and 2 ;
  • FIG. 6 is an enlarged side view of condensation water generated on a hydrophilic coated fin of the heat pump shown in FIGS. 1 and 2 .
  • a heat pump as embodied and broadly described herein may include a compressor 2 for compressing a refrigerant, and an outdoor heat exchanger 4 for heat-exchanging a refrigerant with outdoor air.
  • the outdoor heat exchanger 4 allows a refrigerant to be heat-exchanged with outdoor air flowing due to operation of an outdoor fan 5 to thus condense or evaporate the refrigerant.
  • the heat pump may include an indoor heat exchanger 6 allowing a refrigerant to be heat-exchanged with indoor air, or heat-exchanged with a heating medium such as an anti-freeze solution, water, or the like.
  • the heat pump may be configured as a heat pump type air-conditioner and/or a heat pump type hot water supply device.
  • a heat pump type air-conditioner indoor air is heat-exchanged with the refrigerant in the indoor heat exchanger 6 and then discharged into an indoor area to change an indoor temperature.
  • a heating medium such as water, an anti-freeze solution, or the like, may be heat-exchanged with a refrigerant in the indoor heat exchanger 6 so as to be used for supplying hot water.
  • the indoor-heat exchanger 6 includes a refrigerant tube allowing a refrigerant to pass therethrough and a fin-tube heat exchanger including one or more fins coupled with the refrigerant tube, whereby indoor air is in contact with the fin-tube heat exchanger so as to be heat-exchanged with a refrigerant.
  • the indoor heat-exchanger 6 heat-exchanges indoor air flowing due to operation of an indoor fan 7 with a refrigerant that passes through therein to condense or evaporate the refrigerant.
  • the indoor heat exchanger 6 is configured as a dual-pipe heat exchanger, a plate type heat exchanger, or a shell-tube type heat exchanger including a first flow path allowing the refrigerant to pass therethrough and a second flow path allowing a heating medium to pass therethrough, in which the refrigerant in the first flow path and the heating medium in the second flow path are heat-exchanged with a heat transmission member interposed therebetween, and in this case, the heating medium, passing through the second flow path, is heat-exchanged with the refrigerant through the heat transmission member.
  • the indoor heat exchanger 6 may be connected with a reservoir (or hot water tank) in which the heating medium is accommodated, through a heating medium circulation flow path, and as the heating medium flowing from the reservoir (or hot water tank) passes through the second flow path of the indoor heat exchanger 6 , the refrigerant is evaporated or condensed.
  • the heat pump includes an expansion mechanism 8 installed between the indoor heat exchanger 6 and the outdoor heat exchanger 4 to expand a refrigerant.
  • the heat pump further includes a flow path switch 10 for allowing the refrigerant to circulate from the outdoor heat exchanger 4 , to the expansion mechanism 8 , and then to the indoor heat exchanger 6 , or from the compressor 2 , to the indoor heat exchanger 6 , then to the expansion mechanism 8 , and then to the outdoor heat exchanger 4 .
  • the flow path switch 10 may be one 4-way valve that changes a flow direction of the refrigerant, or a plurality of switching valves that change the flow direction of the refrigerant. In the following description, it is assumed that one 4-way valve is used to change the flow direction of the refrigerant.
  • the heat pump may include an outdoor unit O including the compressor 2 , the outdoor heat exchanger 4 , the outdoor fan 5 , the expansion mechanism 8 , and the flow path switch 10 , and an indoor unit I including the indoor heat exchanger 6 and the indoor fan 7 .
  • the heat pump may perform a cooling operation and a heating operation. In alternative embodiments, the heat pump may perform the cooling operation, the heating operation, and a defrosting operation, or may perform the heating operation and the defrosting operation.
  • the cooling operation is performed to cool a heating medium or indoor air using the indoor heat exchanger 6 .
  • the refrigerant compressed in the compressor 2 flows to the outdoor heat exchanger 4 , sequentially passes through the expansion mechanism 8 and the indoor heat exchanger 6 , and then, is returned to the compressor 2 .
  • the heating operation is performed to heat the heating medium or indoor air.
  • the refrigerant compressed in the compressor 2 flows to the indoor heat exchanger 6 , sequentially passes through the expansion mechanism 8 and the outdoor heat exchanger 4 , and then is returned to the compressor 2 .
  • the defrosting operation is performed to eliminate frost generated at the outdoor heat exchanger 4 by directing compressed refrigerant to the outdoor heat exchanger 4 .
  • the refrigerant compressed in the compressor 2 flows to the outdoor heat exchanger 4 , sequentially passes through the expansion mechanism 8 and the indoor heat exchanger 6 , and then is returned to the compressor 2 .
  • a portion of the compressed refrigerant may pass through a portion of the flow path of the outdoor heat exchanger 4 to partially defrost the outdoor heat exchanger 4 , and the remaining compressed refrigerant may sequentially pass through the indoor heat exchanger 6 and the expansion mechanism 8 , pass through the remaining portion of the flow path of the outdoor heat exchanger 4 , and then, may be returned to the compressor 2 .
  • the defrosting operation When a defrosting condition is met while the heating operation is being performed, the defrosting operation is performed. Thereafter, when a defrosting complete condition is met, the operation may be returned to the heating operation again.
  • the defrosting condition may include, for example, an accumulation of a predetermined amount of operation time of the heat pump in the heating operation, an outdoor temperature, a suction overheat degree, and the like, which triggers the need for defrosting setting conditions.
  • the defrosting complete condition may include, for example, a predetermined amount of time during which the heat pump has been operated in the defrosting operation, the outdoor temperature, the suction overheat degree, and the like, which indicates that defrosting is complete and the defrosting operation may be terminated.
  • the flow path switch 10 directs the refrigerant compressed in the compressor 2 to the outdoor heat exchanger 4 , and when the defrosting condition is met, the flow path switch 10 directs the refrigerant compressed in the compressor 2 to the indoor heat exchanger 6 , and thereafter, when the heat pump is returned to the heating operation, the flow path switch 10 directs the compressed refrigerant compressed in the compressor 2 to the outdoor heat exchanger 4 .
  • the outdoor heat exchanger 4 may be configured as a fin-tube heat exchanger including a refrigerant tube 12 allowing a refrigerant to pass therethrough and one or more fins 14 coupled to the refrigerant tube 12 . Outdoor air is heat-exchanged with the refrigerant through the one or more fins 14 and the refrigerant rube 12 . Both water repellent coating material 16 and hydrophilic coating material 18 may be coated on the fins 14 of the outdoor heat exchanger 4 .
  • the water repellent coating material 16 is coated on one surface of the fins 14 and the hydrophilic coating material 18 is coated on the other surface of the fins 14 (i.e., a surface opposite the surface on which the water repellent coating material is coated).
  • frost growth on the surface of the fins 14 may be delayed and a heating operation duration, without the need for a defrosting operation, may be lengthened.
  • frost melt during the defrosting operation may be more quickly accomplished, and a duration of the defrosting operation may be shortened.
  • the fins 14 may be coated with both the hydrophilic coating material 18 and the water repellent coating material 16 such that frost growth may be delayed and any accumulated frost may be defrosted within a shortened amount of time.
  • a duration of the heating operation may be affected as shown in FIG. 3 and a duration of the defrosting operation may be affected as shown in FIG. 4 .
  • the area of the fins 14 coated with the water repellent coating material 16 may be larger than the area coated with the hydrophilic coating material 18 .
  • the area of the fins 14 coated with the water repellent coating material 16 may be greater 0.5 times and less than 0.6 times the area of the fins 14 that is exposed to/is in contact with air.
  • the area of the fins 14 coated with the water repellent coating material 16 is less than 0.5 times the area that is in contact with air, a corresponding duration of the heating operation may be too short, and when the area of the fins 14 coated with the water repellent coating material 16 is greater 0.6 times the area in contact with air, the duration of the heating operation duration may be lengthened, but in this case, the duration of the defrosting operation duration would also be lengthened.
  • the area of the fins 14 coated with the water repellent coating material 16 is greater than 0.5 times but less than 0.6 times the area in contact with air.
  • Each of the fins 14 include a plate body 22 having two opposite faces thereof in contact with outdoor air and a collar 24 that protrudes in a cylindrical shape from the plate body 22 and coupled with the refrigerant tube 12 .
  • Both faces of the plate body 22 may form outdoor air contact surfaces, and one of the two faces may be coated with the water repellent coating material 16 and the other may be coated with the hydrophilic coating material 18 .
  • An inner circumferential surface A of the collar 24 may contact the refrigerant tube 12 , and an outer circumferential face B of the collar 24 may make contact with outdoor air.
  • the inner circumferential face A of the collar 24 may be coated with the hydrophilic coating material 18 and the outer circumferential face B of the collar 24 may be coated with the water repellent coating material 16 .
  • the two opposite faces C and D of the plate body 22 may include one face D that extends outward from and is perpendicular to the outer circumferential face B of the collar 24 and which may be coated with the water repellent coating material 16 .
  • the opposite face C of the of the plate body 22 may be coated with the hydrophilic coating material 18 , and may extend from and be perpendicular to the inner circumferential face A of the collar 24 .
  • a plurality of fins 14 may be coupled to the refrigerant tube 12 along a length of the refrigerant tube 12 , separated from each other by a predetermined interval.
  • the collars 24 are coupled with the plurality of fins 14 and are arranged along the refrigerant tube 12 such that the collars 24 protrude in the same direction, and are arranged such that the water repellent coating material 16 and the hydrophilic coating material 18 may be positioned in order of water repellent coating material 16 ⁇ hydrophilic coating material 18 ⁇ water repellent coating material 16 ⁇ hydrophilic coating material 18 in a direction perpendicular to the flow of outdoor air.
  • the hydrophilic coating material 18 coated on any one of the plurality of fins 14 is positioned to face the water repellent coating material 16 coated on any of the other of the plurality of fins 14 , in particular, an adjacent fin 14 , and condensation water between the fins 14 may be quickly discharged along the hydrophilic coating material 18 .
  • FIG. 5 is an enlarged side view of condensation water generated on a water repellent coated surface of a fin of a heat pump as embodied and broadly described herein
  • FIG. 6 is an enlarged side view of condensation water generated on a hydrophilic coated surface of a fin of a heat pump as embodied and broadly described herein.
  • the fins 14 of the outdoor heat exchanger 4 may be made of an aluminum material which may be relatively low-priced compared with a copper material.
  • an aluminum material may include, for example, an aluminum alloy.
  • the water repellent coating material 16 may be a coating material that meets the condition in which a contact angle E° of condensation water W generated on the surface of the water repellent coating material 16 is greater than about 90° and is less than about 150° and the hydrophilic coating material 18 may be a coating material that meets the condition in which a contact angle F° of condensation water W is greater than about 0° and is less than about 30°.
  • An outdoor heat exchanger and a heat pump having the same are provided a heating operation duration may be lengthened and heating performance may be enhanced.
  • a heat pump having an outdoor heat exchanger as embodied and broadly described herein may include a compressor compressing a refrigerant; an outdoor heat exchanger heat-exchanging the refrigerant with outdoor air; an indoor heat exchanger heat-exchanging the refrigerant with indoor air or a heating medium; and an expansion mechanism installed between the outdoor heat exchanger and the indoor heat exchanger to expand the refrigerant, wherein the outdoor heat exchanger includes a refrigerant tube in which the refrigerant passes and one or more fins coupled with the refrigerant tube, one face of each of the pins is coated with a water repellent coating material and the other face thereof is coated with a hydrophilic coating material, and an area coated with the water repellent coating material among the areas in contact with air is larger than an area coated with the hydrophilic coating material.
  • Each of the fins may include a plate body portion in contact with outdoor air and a collar protruded in a cylindrical shape from the plate body portion and having an inner circumferential face in contact with the refrigerant tube and an outer circumferential face in contact with outdoor air.
  • the outer circumferential face of the collar may be coated with the water repellent coating material.
  • the inner circumferential face of the collar may be coated with the hydrophilic coating material.
  • a face of the plate body portion, among both faces of the plate body portion, extending to be perpendicular to the outer circumferential face of the collar may be coated with the water repellent coating material, and a face of the plate body portion, among the both faces of the plate body portion, extending to be perpendicular to the inner circumferential face of the collar may be coated with the hydrophilic coating material.
  • the area of the fins coated with the water repellent coating material may exceed 0.5 times and smaller than 0.6 times the area of the fins in contact with outdoor air.
  • the fins may be coupled with the refrigerant tube such that they are separated in a lengthwise direction of the refrigerant tube, and the hydrophilic coating material coated on any one of the plurality of fins may face the water repellent coating material coated on any the other of the plurality of fins.
  • the water repellent coating material and the hydrophilic coating material may be alternately positioned in a direction perpendicular to a direction in which outdoor air flows.
  • the fins may be made of an aluminum material.
  • the water repellent coating material may be a coating material making a contact angle of condensation water generated on a surface of the water repellent coating material exceed 90° and smaller than 150°.
  • the hydrophilic coating material may be a coating material making a contact angle of condensation water generated on a surface of the hydrophilic coating material exceed 0° and smaller than 30°.
  • water repellent coating material is coated on the face of the collar in contact with air, concentration of frost on the collar may be minimized and defrosting can be quickly performed.
  • the defrosting operation duration may be minimized while lengthening a heating operation duration.
  • any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc. means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention.
  • the appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US13/298,335 2010-11-19 2011-11-17 Outdoor heat exchanger and heat pump having the same Abandoned US20120125030A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100115643A KR20120054321A (ko) 2010-11-19 2010-11-19 히트 펌프
KR10-2010-0115643 2010-11-19

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EP (1) EP2455687B1 (fr)
KR (1) KR20120054321A (fr)
CN (1) CN102538297B (fr)

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US20160146480A1 (en) * 2014-11-21 2016-05-26 Mitsubishi Electric Corporation System and method for controlling an outdoor air conditioner
US20190010844A1 (en) * 2017-07-07 2019-01-10 Fujitsu Limited Cooling apparatus, exhaust gas purification apparatus, and vehicle
US20200088432A1 (en) * 2017-03-31 2020-03-19 Daikin Industries, Ltd. Heat exchanger and air conditioner
US11054186B2 (en) * 2016-04-15 2021-07-06 Mitsubishi Electric Corporation Heat exchanger
US20220282940A1 (en) * 2019-07-20 2022-09-08 Nelumbo Inc. Heat Exchangers and Systems Thereof
US20230121635A1 (en) * 2021-10-14 2023-04-20 Amulaire Thermal Technology, Inc. Immersion heat dissipation structure having macroscopic fin structure and immersion heat dissipation structure having fin structure

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KR20130092249A (ko) * 2012-02-10 2013-08-20 엘지전자 주식회사 히트 펌프
KR20140096706A (ko) * 2013-01-29 2014-08-06 한라비스테온공조 주식회사 증발기
JP6596313B2 (ja) * 2015-11-20 2019-10-23 株式会社Ｕａｃｊ プレコートフィン及び熱交換器
WO2026079626A1 (fr) * 2024-10-11 2026-04-16 삼성전자주식회사 Échangeur de chaleur et réfrigérateur le comprenant

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JPH06331293A (ja) * 1993-05-24 1994-11-29 Matsushita Refrig Co Ltd フィンアンドチューブ型熱交換器
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KR20120054321A (ko) 2012-05-30
EP2455687A3 (fr) 2015-09-30
CN102538297A (zh) 2012-07-04
CN102538297B (zh) 2014-12-03
EP2455687A2 (fr) 2012-05-23
EP2455687B1 (fr) 2017-08-30

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