EP2455687B1 - Outdoor heat exchanger and heat pump having the same - Google Patents
Outdoor heat exchanger and heat pump having the same Download PDFInfo
- Publication number
- EP2455687B1 EP2455687B1 EP11189705.4A EP11189705A EP2455687B1 EP 2455687 B1 EP2455687 B1 EP 2455687B1 EP 11189705 A EP11189705 A EP 11189705A EP 2455687 B1 EP2455687 B1 EP 2455687B1
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- EP
- European Patent Office
- Prior art keywords
- coating material
- heat exchanger
- coated
- water repellent
- refrigerant
- 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.)
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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.
- JP H06 117788 A relates to a heat exchanger comprising many fins disposed in parallel, and heat transfer tubes inserted perpendicularly to the fins in such a manner that a lower part of each fin is formed as a water repellent surface, an upper part is formed as a hydrophilic surface and an upper part of the fin at an upstream side of the air is inclined toward an upstream direction of the air.
- JP H04 371796 A relates to a heat exchanger being constituted of a group of heat transfer tubes, conducting fluid therethrough, and two kinds of long and short fins penetrated by the group of the heat transfer tubes wherein water repellent treatment is applied on the surface of the fins and hydrophilic treatment is applied on the end of the fins at the flowout side of the air stream.
- JP H08 152287 A relates to fins being placed so that a hydrophilic surface and a water repelling surface are opposed. Water droplets adhering to the water repelling surface are brought into contact with the water film on the surface to reduce the draft resistance of the air passing between the fins, thereby preventing the scattering of water.
- JP H06 331293 A relates to a fin and tube type heat exchanger being formed of a number of hydrophilic film coated fins which are arranged in parallel at a prescribed pitch and a tube through which refrigerant flows.
- the hydrophilic film coated fin is provided on the surface with a coat layer which is coated with interface activator.
- JP S60 117098 A relates to a film being formed on one side, being the die side during the forming of a collar of a aluminum stock sheet, by applying hydrophilic paint, while a film is formed on the other side, being the punch side during the forming of the collar of the sheet, by applying hydrophobic paint.
- 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.
- 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 includes 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 contacts the refrigerant tube 12, and an outer circumferential face B of the collar 24 makes contact with outdoor air.
- the inner circumferential face A of the collar 24 is coated with the hydrophilic coating material 18 and the outer circumferential face B of the collar 24 is 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 materia! 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.
- 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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Description
- 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.
- In general, 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.
-
JP H06 117788 A -
JP H04 371796 A -
JP H08 152287 A -
JP H06 331293 A -
JP S60 117098 A - 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.
- In such an outdoor heat exchanger, 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°.
- In a heat exchanger as embodied and broadly described herein, since both the water repellent coating material and the hydrophilic coating material are both provided and the area coated with the water repellent coating material, among the areas in contact with air, is greater than the area coated with the hydrophilic coating material, a sufficient heating capacity may be secured in performing a heating operation.
- Additionally, since the 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.
- Further, the defrosting operation duration may be minimized while lengthening a heating operation duration.
- The embodiments will be described in detail with reference to the following drawings in which like reference numerals refer to like elements wherein:
-
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 inFIG. 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 inFIGs. 1 and2 ; -
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 inFIGs. 1 and2 ; -
FIG. 5 is an enlarged side view of condensation water generated on a water repellent coated fin of the heat pump shown inFIGs. 1 and2 ; and -
FIG. 6 is an enlarged side view of condensation water generated on a hydrophilic coated fin of the heat pump shown inFIGs. 1 and2 . - With reference to
FIG. 1 , a heat pump as embodied and broadly described herein may include acompressor 2 for compressing a refrigerant, and anoutdoor heat exchanger 4 for heat-exchanging a refrigerant with outdoor air. Theoutdoor heat exchanger 4 allows a refrigerant to be heat-exchanged with outdoor air flowing due to operation of anoutdoor fan 5 to thus condense or evaporate the refrigerant. - The heat pump includes 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. In the case of the 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. In the case of the heat pump type hot water supply device, a heating medium such as water, an anti-freeze solution, or the like, may be heat-exchanged with a refrigerant in theindoor heat exchanger 6 so as to be used for supplying hot water. - In the case of the heat pump type air-conditioner, 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 anindoor fan 7 with a refrigerant that passes through therein to condense or evaporate the refrigerant. - In the case of the heat pump type hot water supply device, 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 theindoor heat exchanger 6, the refrigerant is evaporated or condensed. - The heat pump includes an
expansion mechanism 8 installed between theindoor heat exchanger 6 and theoutdoor heat exchanger 4 to expand a refrigerant. - The heat pump further includes a
flow path switch 10 for allowing the refrigerant to circulate from theoutdoor heat exchanger 4, to theexpansion mechanism 8, and then to theindoor heat exchanger 6, or from thecompressor 2, to theindoor heat exchanger 6, then to theexpansion mechanism 8, and then to theoutdoor 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, theoutdoor heat exchanger 4, theoutdoor fan 5, theexpansion mechanism 8, and theflow path switch 10, and an indoor unit I including theindoor heat exchanger 6 and theindoor fan 7. - In certain embodiments, 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. For the cooling operation, the refrigerant compressed in thecompressor 2 flows to theoutdoor heat exchanger 4, sequentially passes through theexpansion mechanism 8 and theindoor heat exchanger 6, and then, is returned to thecompressor 2. - The heating operation is performed to heat the heating medium or indoor air. For the heating operation, the refrigerant compressed in the
compressor 2 flows to theindoor heat exchanger 6, sequentially passes through theexpansion mechanism 8 and theoutdoor heat exchanger 4, and then is returned to thecompressor 2. - The defrosting operation is performed to eliminate frost generated at the
outdoor heat exchanger 4 by directing compressed refrigerant to theoutdoor heat exchanger 4. Like the cooling operation, in the defrosting operation, the refrigerant compressed in thecompressor 2 flows to theoutdoor heat exchanger 4, sequentially passes through theexpansion mechanism 8 and theindoor heat exchanger 6, and then is returned to thecompressor 2. - In the defrosting operation, a portion of the compressed refrigerant may pass through a portion of the flow path of the
outdoor heat exchanger 4 to partially defrost theoutdoor heat exchanger 4, and the remaining compressed refrigerant may sequentially pass through theindoor heat exchanger 6 and theexpansion mechanism 8, pass through the remaining portion of the flow path of theoutdoor heat exchanger 4, and then, may be returned to thecompressor 2. - 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. Similarly, 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.
- When the heat pump is used to perform the heating operation, the
flow path switch 10 directs the refrigerant compressed in thecompressor 2 to theoutdoor heat exchanger 4, and when the defrosting condition is met, theflow path switch 10 directs the refrigerant compressed in thecompressor 2 to theindoor heat exchanger 6, and thereafter, when the heat pump is returned to the heating operation, theflow path switch 10 directs the compressed refrigerant compressed in thecompressor 2 to theoutdoor heat exchanger 4. - As shown in
FIG. 2 , theoutdoor heat exchanger 4 may be configured as a fin-tube heat exchanger including arefrigerant tube 12 allowing a refrigerant to pass therethrough and one ormore fins 14 coupled to therefrigerant tube 12. Outdoor air is heat-exchanged with the refrigerant through the one ormore fins 14 and therefrigerant rube 12. Both waterrepellent coating material 16 andhydrophilic coating material 18 may be coated on thefins 14 of theoutdoor heat exchanger 4. - In the exemplary embodiment shown in
FIG. 2 , the waterrepellent coating material 16 is coated on one surface of thefins 14 and thehydrophilic 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). - When the water
repellent coating material 16 is coated on thefins 14 of theoutdoor heat exchanger 4, frost growth on the surface of thefins 14 may be delayed and a heating operation duration, without the need for a defrosting operation, may be lengthened. When thehydrophilic coating material 18 is coated on thefins 14 of theoutdoor heat exchanger 4, frost melt during the defrosting operation may be more quickly accomplished, and a duration of the defrosting operation may be shortened. - In certain embodiments, the
fins 14 may be coated with both thehydrophilic coating material 18 and the waterrepellent coating material 16 such that frost growth may be delayed and any accumulated frost may be defrosted within a shortened amount of time. - In a heat pump as embodied and broadly described herein, taking into consideration a ratio of an area on which the water
repellent coating material 16 is coated (i.e., the heat transmission area of the water repellent coating air side) to an area of thefins 14 are in contact with air flowing through the heat exchanger (i.e., the heat transmission are of the overall air side), a duration of the heating operation may be affected as shown inFIG. 3 and a duration of the defrosting operation may be affected as shown inFIG. 4 . - With reference to
FIGS. 3 and 4 , in order to shorten the duration of the defrosting operation while also lengthening the uninterrupted duration of the heating operation, the area of thefins 14 coated with the waterrepellent coating material 16 may be larger than the area coated with thehydrophilic coating material 18. The area of thefins 14 coated with the waterrepellent coating material 16 may be greater 0.5 times and less than 0.6 times the area of thefins 14 that is exposed to/is in contact with air. - If the area of the
fins 14 coated with the waterrepellent 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 thefins 14 coated with the waterrepellent 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. Thus, the area of thefins 14 coated with the waterrepellent 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 aplate body 22 having two opposite faces thereof in contact with outdoor air and acollar 24 that protrudes in a cylindrical shape from theplate body 22 and coupled with therefrigerant 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 waterrepellent coating material 16 and the other may be coated with thehydrophilic coating material 18. - An inner circumferential surface A of the
collar 24 contacts therefrigerant tube 12, and an outer circumferential face B of thecollar 24 makes contact with outdoor air. In certain embodiments, the inner circumferential face A of thecollar 24 is coated with thehydrophilic coating material 18 and the outer circumferential face B of thecollar 24 is coated with the waterrepellent coating material 16. - The two opposite faces C and D of the plate body 22may 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 waterrepellent coating material 16. The opposite face C of the of theplate body 22 may be coated with thehydrophilic coating material 18, and may extend from and be perpendicular to the inner circumferential face A of thecollar 24. - In the
outdoor heat exchanger 4, a plurality offins 14 may be coupled to therefrigerant tube 12 along a length of therefrigerant tube 12, separated from each other by a predetermined interval. As shown inFIG. 2 , thecollars 24 are coupled with the plurality offins 14 and are arranged along therefrigerant tube 12 such that thecollars 24 protrude in the same direction, and are arranged such that the waterrepellent coating material 16 and thehydrophilic coating material 18 may be positioned in order of waterrepellent coating material 16 →hydrophilic coating material 18 → waterrepellent coating material 16 →hydrophilic coating material 18 in a direction perpendicular to the flow of outdoor air. - Namely, the
hydrophilic coating material 18 coated on any one of the plurality offins 14 is positioned to face the water repellent coating materia! 16 coated on any of the other of the plurality offins 14, in particular, anadjacent fin 14, and condensation water between thefins 14 may be quickly discharged along thehydrophilic 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, andFIG. 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. - In certain embodiments, the
fins 14 of theoutdoor heat exchanger 4 may be made of an aluminum material which may be relatively low-priced compared with a copper material. Such an aluminum material may include, for example, an aluminum alloy. - In order for the water
repellent coating material 16 and thehydrophilic coating material 18 to satisfy appropriate durability conditions when they are coated on thefins 14 made of an aluminum material, the waterrepellent 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 waterrepellent coating material 16 is greater than about 90° and is less than about 150° and thehydrophilic 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.
- 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. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.
- Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
Claims (7)
- A heat pump, comprising:a compressor (2); an outdoor heat exchanger (4) that performs heat exchange between refrigerant and outdoor air;an indoor heat exchanger (6) that performs heat exchange between refrigerant and indoor air; andan expander installed between the outdoor heat exchanger and the indoor heat exchanger, wherein the outdoor heat exchanger comprises:a refrigerant tube (12) that guides refrigerant therethrough;a fin (14) coupled to the refrigerant tube, wherein the fin is provided with a substantially cylindrical collar (24) having an inner circumferential surface (A) thereof in contact with the refrigerant tube and an outer circumferential surface (B) thereof exposed to air flowing through the outdoor heat exchanger, and a plate body (22) extended outside from the collar;a water repellent coating material (16) applied to a first surface of the plate body of the fin; anda hydrophilic coating material (18) applied to a second surface of the plate body of the fin, characterized in that the water repellent coating material is coated on the outer circumferential surface of the collar, the hydrophilic coating material is coated on the inner circumferential surface of the collar, and an area of the fin coated with the water repellent coating material is greater than 0.5 times and less than 0.6 times a total area thereof that is exposed to the air flowing through the outdoor heat exchanger.
- The heat pump of claim 1, wherein a first surface of the plate body (22) that extends outward from and is perpendicular to the outer circumferential surface (B) of the collar (24) is coated with the water repellent coating material (16), and a second surface of the plate body that extends outward from and is perpendicular to the inner circumferential surface (A) of the collar is coated with the hydrophilic coating material (18).
- The heat pump of claims 1 or 2, wherein plurality of fins (14) are arranged at predetermined intervals along the refrigerant tube (12), and wherein the hydrophilic coating material (18) coated on any one of the plurality of fins faces the water repellent coating material (16) coated on an adjacent fin of the plurality of fins.
- The heat pump of claim 3, wherein the water repellent coating material (16) and the hydrophilic coating material (18) are alternately positioned in a direction perpendicular to an air flow direction in the outdoor heat exchanger (4).
- The heat pump of claim 4, wherein each of the plurality of fins (14) is made of an aluminum material.
- The heat pump of claim 3, wherein a contact angle (E°) of condensation water generated on a surface of the water repellent coating material (16) is greater than 90° and less than 150°.
- The heat pump of claim 3, wherein a contact angle (F°) of condensation water generated on a surface of the hydrophilic coating material (18) is greater than 0° and less than 30°.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020100115643A KR20120054321A (en) | 2010-11-19 | 2010-11-19 | Heat pump |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2455687A2 EP2455687A2 (en) | 2012-05-23 |
EP2455687A3 EP2455687A3 (en) | 2015-09-30 |
EP2455687B1 true EP2455687B1 (en) | 2017-08-30 |
Family
ID=45440097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11189705.4A Active EP2455687B1 (en) | 2010-11-19 | 2011-11-18 | Outdoor heat exchanger and heat pump having the same |
Country Status (4)
Country | Link |
---|---|
US (1) | US20120125030A1 (en) |
EP (1) | EP2455687B1 (en) |
KR (1) | KR20120054321A (en) |
CN (1) | CN102538297B (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20130092249A (en) * | 2012-02-10 | 2013-08-20 | 엘지전자 주식회사 | Heat pump |
JP5932597B2 (en) * | 2012-10-11 | 2016-06-08 | 三菱電機株式会社 | HEAT EXCHANGER, MANUFACTURING METHOD THEREOF, AND AIR CONDITIONER HAVING THE HEAT EXCHANGER |
KR20140096706A (en) * | 2013-01-29 | 2014-08-06 | 한라비스테온공조 주식회사 | Evaporator |
US10107509B2 (en) * | 2014-11-21 | 2018-10-23 | Mitsubishi Electric Corporation | System and method for controlling an outdoor air conditioner |
JP6596313B2 (en) * | 2015-11-20 | 2019-10-23 | 株式会社Uacj | Pre-coated fins and heat exchanger |
JP6559334B2 (en) * | 2016-04-15 | 2019-08-14 | 三菱電機株式会社 | Heat exchanger |
JP6471824B2 (en) * | 2017-03-31 | 2019-02-20 | ダイキン工業株式会社 | Heat exchanger and air conditioner |
JP2019016709A (en) * | 2017-07-07 | 2019-01-31 | 富士通株式会社 | Cooling device, exhaust purifier, and motor vehicle |
MX2022000773A (en) * | 2019-07-20 | 2022-02-14 | 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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- 2011-11-18 CN CN201110378687.9A patent/CN102538297B/en not_active Expired - Fee Related
- 2011-11-18 EP EP11189705.4A patent/EP2455687B1/en active Active
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Also Published As
Publication number | Publication date |
---|---|
EP2455687A2 (en) | 2012-05-23 |
CN102538297B (en) | 2014-12-03 |
EP2455687A3 (en) | 2015-09-30 |
CN102538297A (en) | 2012-07-04 |
KR20120054321A (en) | 2012-05-30 |
US20120125030A1 (en) | 2012-05-24 |
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