WO2012147288A1 - Susbtrat hydrofuge, échangeur de chaleur utilisant le substrat hydrofuge et procédé de production du substrat hydrofuge - Google Patents

Susbtrat hydrofuge, échangeur de chaleur utilisant le substrat hydrofuge et procédé de production du substrat hydrofuge Download PDF

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Publication number
WO2012147288A1
WO2012147288A1 PCT/JP2012/002423 JP2012002423W WO2012147288A1 WO 2012147288 A1 WO2012147288 A1 WO 2012147288A1 JP 2012002423 W JP2012002423 W JP 2012002423W WO 2012147288 A1 WO2012147288 A1 WO 2012147288A1
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WIPO (PCT)
Prior art keywords
water
substrate
needle
repellent
protrusions
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PCT/JP2012/002423
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English (en)
Japanese (ja)
Inventor
侑作 西岡
友英 西野
瀧川　賢司
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株式会社デンソー
外山 哲男
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Publication of WO2012147288A1 publication Critical patent/WO2012147288A1/fr

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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
    • F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
    • F28F1/128—Fins with openings, e.g. louvered fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • F28F17/005—Means for draining condensates from heat exchangers, e.g. from evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/05316—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05341—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/10—Secondary fins, e.g. projections or recesses on main fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2245/00—Coatings; Surface treatments
    • F28F2245/04—Coatings; Surface treatments hydrophobic
    • 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
    • F28F2245/08—Coatings; Surface treatments self-cleaning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/20—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes with nanostructures

Definitions

  • the present disclosure relates to a water-repellent base material that repels condensed water generated from the surface of the base material at low temperatures, a heat exchanger using the water-repellent base material, and a method for producing the water-repellent base material.
  • Patent Document 1 As a conventional water-repellent substrate, for example, one described in Patent Document 1 is known.
  • the water-repellent substrate of Patent Document 1 is applied to a window glass for a vehicle and the like, and has a base film having minute irregularities on the surface of the substrate, and a water repellency formed on the minute irregularities of the substrate film. It has a film.
  • the water-repellent film has a surface shape reflecting the minute irregularities of the base film.
  • the surface shape of the water-repellent coating is composed of particulate protrusions and columnar protrusions that are higher in height as measured from the surface of the substrate than the particulate protrusions.
  • CA ⁇ 150 degrees where CA is the contact angle of water droplets on the surface of the water-repellent coating, and TA is the falling angle as the critical angle at which the water droplets fall when dropped.
  • the water-repellent substrate of Patent Document 1 is excellent in dropping water drops dripped on a window glass or the like as described above.
  • water vapor in the air that touches the base material is condensed to generate condensed water from the surface of the base material.
  • the material had a problem that good water repellency of condensed water could not be obtained. That is, in the water-repellent substrate of Patent Document 1, condensed water is generated also from the inside of the recess formed between the particulate protrusions and the columnar protrusions, and the condensed water accumulates in the recess, and further outside the recess. Since the condensed water in each recess is connected to each other to form a large water film, it is difficult to obtain good water repellency of the condensed water and it is difficult for the condensed water to slide down.
  • an object of the present disclosure is to provide a water-repellent substrate having good water repellency with respect to condensed water generated on the surface, a heat exchanger using the water-repellent substrate, and a method for producing the water-repellent substrate. Is to provide.
  • the present disclosure provides a water-repellent substrate including a substrate and a hydrophobic film provided on the surface of the substrate, and a plurality of needles are provided on the surface of the substrate.
  • a plurality of fine protrusions that are finer than the plurality of needle-like protrusions, and the plurality of fine protrusions are formed of the plurality of needle-like protrusions.
  • a water-repellent substrate provided on the surface and the remaining substrate surface between the plurality of needle-like protrusions.
  • a heat-absorbing heat that includes a heat exchange unit and absorbs heat from the air flowing outside the heat exchange unit by a heat medium flowing inside the heat exchange unit.
  • the exchanger at least one of the heat medium distribution tube forming the heat exchange part and the fin connected to the tube and forming a heat transfer surface for the air is the water repellent group.
  • a heat exchanger formed of a material is provided.
  • the present disclosure provides a method for producing a water-repellent substrate comprising a substrate and a hydrophobic film provided on the surface of the substrate, the surface of the substrate Forming a plurality of needle-like projections on the surface of the plurality of needle-like projections and the remaining surface of the base material between the plurality of needle-like projections.
  • a method for producing a water-repellent substrate including forming the hydrophobic film by forming a plurality of fine protrusions that are finer than the above is provided.
  • FIG. 1 is a cross-sectional view showing a water-repellent substrate.
  • FIG. 2 is an enlarged view of a portion indicated by an arrow II in FIG.
  • FIG. 3A and FIG. 3B are enlarged views showing the surface of the base material (magnification 1000 times).
  • 4 (a) and 4 (b) are enlarged views showing the surface (needle-like protrusion) of the substrate (magnification 100000 times).
  • FIG. 5 is a perspective view showing a heat exchanger.
  • FIG. 6 is a model diagram showing a fin cross section and a condensed water droplet diameter.
  • FIG. 7 is a model diagram for obtaining a water drop sliding calculation formula.
  • FIG. 8 is a model diagram for calculating the surface energy of the slidable film.
  • FIG. 1 is a cross-sectional view showing a water-repellent substrate.
  • FIG. 2 is an enlarged view of a portion indicated by an arrow II in FIG.
  • FIG. 9 is a model diagram for calculating the contact angle so that the droplet diameter slides at 0.4 mm.
  • FIG. 10 is a graph for obtaining a contact angle for preventing water droplets from closing in the fin.
  • FIG. 11 (a) is a graph which shows the frost formation time when frost formation and defrost in the heat exchanger based on this indication are repeated, and
  • FIG.11 (b) is frost formation and removal in the heat exchanger of a comparative example. It is a graph which shows frost formation time when frost is repeated.
  • FIG. 1 is a cross-sectional view showing a water-repellent substrate 100
  • FIG. 2 is an enlarged view of a portion indicated by an arrow II in FIG. 1
  • FIGS. 3 (a) and 3 (b) are enlarged views showing the surface of the substrate 110.
  • FIG. 4 (a) and FIG.4 (b) are the enlarged views (magnification 100000 times) which show the surface (needle-shaped projection part 111) of the base material 110.
  • FIG. As shown in FIG. 1, the water-repellent substrate 100 is formed by providing a hydrophobic film 120 on the surface of a substrate 110 formed from an aluminum plate material.
  • the substrate 110 is a plate member made of metal such as aluminum, aluminum alloy, iron, copper, or resin, and a large number of needle-like protrusions 111 extending in a needle shape are formed on the surface of the substrate 110. Yes.
  • the dimension between the protrusions of the needle-like protrusions 111 is defined as a period
  • the period of the needle-like protrusions 111 is about 700 nm to 500 ⁇ m.
  • the period of the acicular protrusion 111 is preferably about 1 ⁇ m to 10 ⁇ m.
  • the needle-like protrusion 111 is a protrusion on the order of microns.
  • the hydrophobic film 120 is formed by a plurality of fine protrusions 121. That is, the hydrophobic film 120 is formed as an aggregate of a plurality of fine protrusions 121.
  • the fine protrusions 121 are protrusions that are formed more finely than the needle-like protrusions 111 on the surface of the needle-like protrusions 111 and the remaining surface of the substrate 110 between the needle-like protrusions 111.
  • the period of the fine protrusions 121 is about 1 nm to 500 nm.
  • the period of the fine protrusions 121 is preferably about 1 nm to 10 nm.
  • the fine protrusion 121 is a nano-order protrusion.
  • the water repellent substrate 110 is manufactured as follows.
  • First step First, a 4 cm 2 (2 cm square) aluminum plate material is manufactured as the base material 110. And the uneven
  • grooved part 112 is made into the uneven
  • Second step (projection forming step)
  • the substrate 110 on which the irregularities 112 were formed was immersed in acetone to clean the surface, and the boehmite treatment was performed by immersing in boiling pure water for 5 minutes.
  • the substrate 110 taken out was cooled, washed by blowing ultrapure water, and dried by blowing nitrogen gas. Thereby, a hydroxyl group was generated on the surface of the substrate 110.
  • a needle-like protrusion 111 was formed on the surface of the substrate 110.
  • An amine such as diethanolamine may be added to boiling water.
  • boehmite treatment of the substrate 110 there are two purposes for the boehmite treatment of the substrate 110 as described above.
  • One is boehmite treatment to form a hydroxyl group on the surface of the substrate 110, and in the subsequent third step, a molecule having a hydrophobic functional group dissolved in a water-saturated solution is reacted with the hydroxyl group. This is to form a strong bond between the substrate 110 and the substrate 110.
  • the second purpose of the boehmite treatment is to etch the surface of the base material 110 in the course of the boehmite treatment, thereby forming the needle-like protrusions 111 having a very fine needle-like structure on the surface of the concavo-convex portion 112.
  • FIGS. 4 (a) and 4 (b) Images obtained by observing the substrate 110 after the boehmite treatment with a scanning electron microscope (SEM) are shown in FIGS. 4 (a) and 4 (b).
  • 4A and 4B are observation results at two representative positions on the surface of the substrate 110.
  • FIG. When the roughness was analyzed from the analysis result from the SEM image, the needle-like protrusion 111 was confirmed. At this time, the arithmetic average height Ra of the needle-like protrusion 111 was 20 nm.
  • Third step (film formation step)
  • the surface of the needle-like protrusion 111 and the needle-like protrusion are formed by immersing the substrate 110 in a water saturated solution of molecules having a hydrophobic functional group.
  • a hydrophobic coating 120 is formed by forming a plurality of fine protrusions 121 each consisting of a molecular chain having a hydrophobic functional group on the surface of the remaining substrate 110 between 111.
  • the base material 110 whose surface was boehmite-treated in the second step was immersed in a 25 mM water saturated xylene solution of ODS (octadecyltrimethylsilane) at room temperature (20 ° C.) for 2 days.
  • ODS octadecyltrimethylsilane
  • Fourth step post-treatment of film forming process
  • the substrate 110 subjected to the film forming process in the third step was washed with acetone and then dried at 80 ° C. for 1 hour.
  • a plurality of molecular chains (alkyl) of C 18 H 37 Si (O ⁇ ) 3 having an alkyl group are formed on the surface of the needle-like protrusion 111 and the remaining surface of the base 110 between the needle-like protrusions 111.
  • Water-repellent substrate in which a plurality of fine protrusions 121 are formed, and a hydrophobic film (water-repellent film) 120 that is a monomolecular film (alkyl monomolecular film) is formed by the plurality of molecular chains. 100 was produced.
  • the fourth step can be omitted.
  • the water-repellent substrate 100 configured as described above has a structure schematically shown in FIGS.
  • the needle-like protrusion 111 is formed by the second step
  • the fine protrusion 121 that is, the hydrophobic film 120 (ODS monomolecular film) is formed by the third step. It has become.
  • the condensed water grows in combination with each other even if condensed water is generated from the bottom surface between the needle-like protrusions 111. Since the fine projections 121 are pushed from the bottom side between the needle-like projections 111 toward the tip side by the fine projections 121, the needle-like projections 111 do not stagnate. Therefore, the condensed water accumulates in the concave portions as in the prior art, and the condensed water in the concave portions is connected to each other outside the concave portions to form a large water film, so that the water is repelled as water droplets of condensed water. You can slide down.
  • the water-repellent substrate 100 of the present embodiment exhibits high sliding performance as described above even under conditions where frost can be generated on the surface at low temperatures. It was possible to delay the time of occurrence.
  • the water-repellent substrate 100 was created by changing the film-forming material in the third step with respect to the first embodiment.
  • the substrate 110 that has undergone the same steps as those of the first embodiment was prepared until the first step and the second step.
  • a substrate 110 whose surface was boehmite-treated in a FAS17 (perfluorodecyloxysilane) 25 mM water-saturated 1,3-bis (trifluoromethyl) benzene (F6xy) solution in the second step. was immersed at room temperature (20 ° C.) for 2 days.
  • the same process as in the fourth step of the first embodiment was performed.
  • a plurality of C 8 F 17 C 2 H 4 Si (O ⁇ ) 3 having a fluoroalkyl group is formed on the surface of the needle-like protrusion 111 and the remaining surface of the base 110 between the needle-like protrusions 111.
  • the molecular chain (fluoroalkyl chain), that is, a plurality of fine protrusions 121 are formed, and the hydrophobic film 120 that is a monomolecular film (fluoroalkyl monomolecular film) is formed by the plurality of molecular chains.
  • a substrate 100 was produced. Note that the fourth step can be omitted.
  • the water-repellent substrate 100 prepared in this way showed the same water repellency as the water-repellent substrate 100 prepared in the first embodiment.
  • the water-repellent substrate 100 was created by changing the film-forming material in the third step with respect to the first and second embodiments.
  • the substrate 110 that has undergone the same steps as those of the first and second embodiments was prepared until the first step and the second step. Then, as a third step (film formation step), a surface of the reaction vessel is sealed in the second step in a sealed and pressurizable container having a capacity of 20 ml in which 0.5 g of C 8 F 17 C 2 H 4 NCO (perfluorodeoxycynate) is enclosed. Boehmite-treated substrate 110 was inserted and sealed, and a gas phase reaction was performed at 150 ° C. for 72 hours.
  • the water-repellent substrate 100 prepared in this way showed the same water repellency as the water-repellent substrate 100 prepared in the first and second embodiments.
  • the water-repellent substrate 100 is created by changing the film forming material in the third step as compared with the first to third embodiments.
  • the base material 110 that has undergone the same processes as those of the first to third embodiments until the first process and the second process was prepared. Then, as a third step (film forming step), a surface-boehmite-treated base in the second step is placed in a 100-ml sealed and pressurizable reaction vessel in which 1.4 g of C 18 H 37 NCO (octadecylicocynate) is enclosed. The material 110 was inserted and sealed, and gas phase reaction was performed at 150 ° C. for 72 hours.
  • a plurality of molecular chains (alkyl chains) of C 18 H 37 NHCOO — having an alkyl group are formed on the surface of the needle-like protrusions 111 and the surface of the remaining base 110 between the needle-like protrusions 111, that is, A water-repellent substrate 100 in which a plurality of fine protrusions 121 were formed and a hydrophobic film 120 as a monomolecular film (alkyl monomolecular film) was formed by the plurality of molecular chains was produced.
  • the water-repellent substrate 100 prepared in this way showed the same water repellency as the water-repellent substrate 100 prepared in the first to third embodiments.
  • the water-repellent substrate 100 described in the first to fourth embodiments is applied to a heat exchanger 200.
  • the heat exchanger 200 is an endothermic heat exchanger, and is an evaporator that cools air for air conditioning in a refrigeration cycle of a vehicle air conditioner, for example, as shown in FIG.
  • the heat exchanger 200 includes a heat exchange unit 210 and a pair of header tanks 220 connected to the heat exchange unit 210.
  • the heat exchanging unit 210 includes a plurality of laminated tubes 211 having a flat cross section, and corrugated fins 212 interposed between the tubes 211.
  • the tubes 211 are tube members through which a refrigerant as a heat medium flows, and both ends of each tube 211 are connected to communicate with the inside of the pair of header tanks 220.
  • the fin 212 is a heat transfer member that is formed in a wave shape from a thin strip material and forms a heat transfer surface, and is joined (connected) to the tube 211. As shown in FIG. 6, a plurality of armor-door louvers 212 a are formed on the heat transfer surfaces of the fins 212.
  • the tubes 211 and the fins 212 are formed by the water-repellent substrate 100 described in any one of the first to fourth embodiments.
  • the refrigerant that has been depressurized in the refrigeration cycle to low temperature and low pressure flows through the plurality of tubes 211, and around the outside of the tubes 211 and around the fins 212 (outside of the heat exchanging unit 210).
  • the air for air conditioning passes through the air and the air for air conditioning is cooled by the refrigerant.
  • the air-conditioning air is cooled, if the temperature of the air-conditioning air falls below the dew point temperature of the water vapor contained in the air, the water vapor becomes condensed water on the surface of the heat exchange unit 210 (tube 211, fin 212). Adhere to.
  • the distance between the heat transfer surfaces is usually set to about 1.5 mm, and the pitch of the louvers 212a is set to about 0.8 mm. Therefore, even when condensed water is generated, the condensed water droplet diameter is 0.4 mm or less so that the condensed water does not form curtains (water clogging) due to surface tension between the louvers 212a having a narrow gap. It is necessary to suppress it so that it becomes.
  • 2 ⁇ rE adhesion force
  • mg ⁇ sin ⁇ gravity along the sliding direction
  • r condensed water droplet radius (m)
  • E surface energy of the sliding film ( J / m 2 )
  • m the mass of the water drop (kg)
  • g the acceleration of gravity (m / s 2 )
  • ⁇ the tilt angle (degree)
  • ⁇ in FIG. 7 is the contact angle (degree).
  • the surface energy E is obtained based on the formula 1 and the experimental result.
  • 2 ⁇ rE represents adhesion
  • 1/2 ⁇ ⁇ ⁇ V 2 ⁇ A ⁇ C D represents drag
  • r condensed water droplet radius (m)
  • E represents sliding force.
  • ⁇ is the air density (kg / m 3)
  • V the relative velocity (m / s)
  • A the projected cross section (m 2 )
  • CD the drag coefficient.
  • ⁇ 1000 (kg / m3)
  • relative velocity V 1 m / s
  • projected cross-sectional area A ⁇ ⁇ 0.2 2
  • drag coefficient CD approximate value
  • the drag of FIG. 10 is in the range of the contact angle ⁇ that exceeds the adhesive force, and the contact angle ⁇ is found to be 148 degrees or more. .
  • the water repellent substrate 100 of the first to fourth embodiments is obtained at a contact angle of 160 degrees.
  • the tube 211 and the fin 212 are used. Condensed water could be satisfactorily slid down and removed without any special operation from the surface. Moreover, since the good sliding down of the condensed water was obtained, it was possible to delay the time for generating frost to a predetermined amount on the surface of the heat exchange unit 210.
  • FIG.11 (a) is a graph which shows frost formation time when frost formation and defrosting are repeated in the heat exchanger 200 based on this indication.
  • FIG.11 (b) is a graph which shows the frost formation time when frost formation and defrosting are repeated in the heat exchanger of a comparative example.
  • the heat exchanger of the comparative example includes a conventional hydrophilic film and does not include the hydrophobic film in the present embodiment.
  • the condensed water is less likely to stagnate in the heat exchanging unit 210, so that the frosting occurs and the ventilation resistance of the heat exchanging unit 210 is a predetermined value (here, The time to 100 Pa) can be greatly reduced.
  • the hydrophobic coating 120 ODS, FAS17, C 8 F 17 C 2 H 4 NCO, has formed the monomolecular film by using a C 18 H 37 NCO, etc., other than these materials
  • a monomolecular film may be formed.
  • any structure having a hydrophobic group such as fluorine on one side and a functional group that easily binds to a hydroxyl group such as O—Si—O on the other side is applicable.
  • numerator which has hydrophobic functional groups like an alkyl group and a fluoroalkyl group is contained as a molecule
  • the method for creating the needle-like protrusion 111 is not limited to the method of each of the above-described embodiments, and besides this, a nanoimprint method or the like can be used.
  • the structure which uses an aluminum plate material was illustrated as the base material 110 in each said embodiment, various metals, such as a copper plate and an iron plate, can be used besides an aluminum plate material.
  • the base material 110 is not limited to a metal, For example, you may form with resin.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

Un substrat hydrofuge (100) est doté d'un substrat (110) et d'un film hydrophobe (120) disposé sur la surface du substrat (110) ; une pluralité de saillies spiculaires (111) étant formée sur la surface du substrat (110). Le film hydrophobe (120) comprend une pluralité de saillies minuscules (121) qui sont plus fines que les saillies spiculaires (111) et la pluralité de saillies minuscules (121) est disposée sur la surface du substrat (110) restant entre la surface des saillies en forme d'aiguilles (111) et les saillies en forme d'aiguilles (111). Au moins l'un des tubes (211) qui composent la section d'échange de chaleur (210) d'un échangeur de chaleur (200) utilisé pour la circulation d'un agent de transfert de chaleur et une ailette (212) raccordée au tube (211) pour former une surface de transfert de chaleur vers l'air de l'atmosphère est formé par le substrat hydrofuge (100).
PCT/JP2012/002423 2011-04-27 2012-04-06 Susbtrat hydrofuge, échangeur de chaleur utilisant le substrat hydrofuge et procédé de production du substrat hydrofuge WO2012147288A1 (fr)

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JP2011099198A JP2012228670A (ja) 2011-04-27 2011-04-27 撥水性基材、撥水性基材を用いた熱交換器、および撥水性基材の製造方法
JP2011-099198 2011-04-27

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JP2015193922A (ja) * 2014-03-24 2015-11-05 三菱重工業株式会社 撥液化する表面微細構造並びにその製造方法、熱交換器、および空気調和機の構成要素
JP2016107530A (ja) * 2014-12-08 2016-06-20 株式会社豊田中央研究所 撥水材及びその製造方法
KR102132906B1 (ko) * 2018-10-23 2020-07-10 포항공과대학교 산학협력단 액적 점핑 촉진을 통해 응축 성능을 향상시킬 수 있는 초소수성 응축 열전달 표면 구조
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