FR2663725A1 - IMPROVED COPPER HEAT EXCHANGER FOR WALL-MOUNTED WATER HEATERS. - Google Patents

IMPROVED COPPER HEAT EXCHANGER FOR WALL-MOUNTED WATER HEATERS. Download PDF

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Publication number
FR2663725A1
FR2663725A1 FR9107590A FR9107590A FR2663725A1 FR 2663725 A1 FR2663725 A1 FR 2663725A1 FR 9107590 A FR9107590 A FR 9107590A FR 9107590 A FR9107590 A FR 9107590A FR 2663725 A1 FR2663725 A1 FR 2663725A1
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FR
France
Prior art keywords
heat exchanger
coating
water heaters
minutes
copper heat
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.)
Granted
Application number
FR9107590A
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French (fr)
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FR2663725B1 (en
Inventor
Fantechi Fabrizio
Becagli Mary
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.)
Nuovo Pignone Holding SpA
Nuovo Pignone SpA
Original Assignee
Nuovopignone Industrie Meccaniche e Fonderia SpA
Nuovo Pignone SpA
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 Nuovopignone Industrie Meccaniche e Fonderia SpA, Nuovo Pignone SpA filed Critical Nuovopignone Industrie Meccaniche e Fonderia SpA
Publication of FR2663725A1 publication Critical patent/FR2663725A1/en
Application granted granted Critical
Publication of FR2663725B1 publication Critical patent/FR2663725B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • 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
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • 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
    • F28F21/02—Constructions of heat-exchange apparatus characterised by the selection of particular materials of carbon, e.g. graphite
    • 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
    • F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper 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
    • 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
    • F28F21/089—Coatings, claddings or bonding layers made from metals or metal alloys

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

Echangeur de chaleur en cuivre pour des chauffe-eau montés sur des murs, protégé par un revêtement de résine de silicone avec des pigments d'oxyde de fer et de graphite. On décrit également un procédé pour appliquer efficacement un tel revêtement protecteur à l'échangeur de chaleur en cuivre.Copper heat exchanger for water heaters mounted on walls, protected by a coating of silicone resin with iron oxide and graphite pigments. Also disclosed is a method for effectively applying such a protective coating to the copper heat exchanger.

Description

ECHANGEUR DE CHALEUR EN CUIVRE AMELIORE POUR CHAUFFE-EAUIMPROVED COPPER HEAT EXCHANGER FOR WATER HEATERS

MONTES SUR DES MURSMOUNT ON WALLS

Cette invention concerne un nouvel échangeur de chaleur en cuivre pour des chauffe-eau montés sur des murs qui soient efficacement protégés contre la corrosion due au condensat acide et aux températures élevées, donnant par conséquent à 1 'échangeur de chaleur un rendement élevé et  This invention relates to a new copper heat exchanger for wall mounted water heaters which are effectively protected against corrosion due to acid condensate and high temperatures, thereby giving the heat exchanger high efficiency and

une durée de vie plus longue.longer service life.

L'invention concerne également un processus spécifique pour appliquer le revêtement nécessaire à l'échangeur de chaleur à protéger Les revêtements pour protéger l'échangeur de chaleur de chauffe-eau montés sur des murs sont déjà connus dans la technique, et se composent généralement de résines silicones pigmentées à  The invention also relates to a specific process for applying the coating necessary for the heat exchanger to be protected. The coatings for protecting the heat exchanger of water heaters mounted on walls are already known in the art, and generally consist of pigmented silicone resins with

l'aluminium.aluminum.

Lesdits revêtements aluminium-silicone procurent une protection efficace contre les températures élevées, mais ont pour inconvénient le fait qu'ils ne sont pas également efficaces contre les condensats à cause de la nature chimique du pigment aluminium dont on sait qu'il est facilement attaqué par des solutions acides, et, par conséquent, qui se détériore, avec une perte consécutive de  Said aluminum-silicone coatings provide effective protection against high temperatures, but have the disadvantage that they are not equally effective against condensates because of the chemical nature of the aluminum pigment which is known to be easily attacked by acid solutions, and therefore deteriorating, with a consequent loss of

l'effet de protection contre la corrosion du cuivre sous-  the corrosion protection effect of copper under

jacent. De plus, la tendance courante à réaliser des chauffe-eau à haut rendement montés sur des murs augmente le problème de la corrosion du cuivre de l'échangeur de chaleur par un condensat acide, ce qui met l'accent sur  jacent. In addition, the current trend towards high-performance wall-mounted water heaters increases the problem of corrosion of the copper in the heat exchanger by acid condensate, which emphasizes

ladite déficience des revêtements connus.  said deficiency of known coatings.

L'objet de la présente invention est de résoudre ledit inconvénient en procurant un revêtement pour l'échangeur de chaleur en cuivre de chauffeeau montés sur des murs, qui, en plus d'être résistant aux températures élevées que l'on trouve dans les chauffe-eau montés sur des parois modernes, crée une couche protectrice hautement anti-corrosive efficace contre le condensat acide qui est particulièrement abondant dans les chauffe-eau à haut  The object of the present invention is to solve said drawback by providing a coating for the copper heat exchanger of water heaters mounted on walls, which, in addition to being resistant to the high temperatures found in heaters -water mounted on modern walls, creates a highly anti-corrosive protective layer effective against acid condensate which is particularly abundant in water heaters with high

rendement montés sur des murs.performance mounted on walls.

Ceci est obtenu substantiellement en remplaçant ledit pigment en aluminium par d'autres pigments protecteurs qui sont inertes vis-à-vis de l'agression des condensats acides, comme par exemple un mélange d'oxyde de fer et de graphite, qui, en plus desdits avantages, donnent au revêtement, et, par conséquent, à l'échangeur de chaleur, une coloration noire qui augmente et favorise le  This is achieved substantially by replacing said aluminum pigment with other protective pigments which are inert towards the aggression of acid condensates, such as for example a mixture of iron oxide and graphite, which, in addition said advantages, give the coating, and therefore the heat exchanger, a black coloring which increases and promotes the

transfert de chaleur.heat transfer.

Par conséquent, le revêtement de protection pour l'échangeur de chaleur en cuivre des chauffe-eau montés sur des murs, ledit revêtement étant composé d'une résine de silicone, est caractérisé par le fait qu'il contient comme  Consequently, the protective coating for the copper heat exchanger of wall-mounted water heaters, said coating being composed of a silicone resin, is characterized in that it contains as

pigment un mélange d'oxyde de fer et de graphite.  pigment a mixture of iron oxide and graphite.

Comme on peut le voir de façon expérimentale, à cause de la géométrie complexe de l'échangeur de chaleur, l'efficacité d'un tel revêtement protecteur dépend strictement d'un processus d'application parimmersion avec  As can be seen experimentally, because of the complex geometry of the heat exchanger, the effectiveness of such a protective coating depends strictly on a process of application by immersion with

des paramètres opérationnels définis avec précision.  precisely defined operational parameters.

De façon plus spécifique, le processus pour appliquer ledit revêtement sur l'échangeur de chaleur en cuivre de chauffe-eau montés sur des murs, ledit processus étant un processus par immersion, se caractérise par les étapes suivantes: ajustage de la viscosité en coupelle Ford NI 4 du revêtement par dilution appropriée avec du solvant à une plage comprise entre 40 à 55 secondes; maintien de l'échangeur de chaleur afin qu'il soit protégé dans le bain de revêtement agité de façon appropriée à ladite viscosité pendant un temps compris entre 20 et 30 secondes; mise au séchage à l'air de la couche de revêtement appliquée à l'échangeur de chaleur pendant un temps qui ne soit pas inférieur à 30 minutes; et, finalement, polymérisation de ladite couche de revêtement dans un four entre 1000 C et 1900 C pendant un temps qui ne  More specifically, the process for applying said coating to the copper heat exchanger of wall-mounted water heaters, said process being an immersion process, is characterized by the following stages: adjustment of the viscosity in a Ford cup NI 4 of the coating by appropriate dilution with solvent to a range of 40 to 55 seconds; maintaining the heat exchanger so that it is protected in the coating bath stirred appropriately to said viscosity for a time between 20 and 30 seconds; air-drying the coating layer applied to the heat exchanger for a time of not less than 30 minutes; and, finally, polymerization of said coating layer in an oven between 1000 C and 1900 C for a time which does not

soit pas inférieur à 30 minutes.not less than 30 minutes.

Des résultats expérimentaux exceptionnellement bons pour un échangeur de chaleur efficacement protégé et par conséquent à longue durée de vie, ont été obtenus en immergeant l'échangeur de chaleur pendant 20 secondes dans un bain de résine de silicone avec un ajout d'oxyde de fer et de graphite ayant une viscosité en coupelle Ford NO 4 de 42 secondes, puis en séchant de la couche de revêtement appliquée à l'échangeur de chaleur pendant 30 minutes à l'air, et, finalement, en polymérisant de ladite couche de  Exceptionally good experimental results for an effectively protected and therefore long-lived heat exchanger have been obtained by immersing the heat exchanger for 20 seconds in a silicone resin bath with the addition of iron oxide and of graphite having a Ford NO 4 cup viscosity of 42 seconds, then drying the coating layer applied to the heat exchanger for 30 minutes in air, and, finally, polymerizing said layer of

revêtement dans un four pendant 30 minutes à 165 C.  coating in an oven for 30 minutes at 165 C.

-s-s

Claims (3)

REVENDICATIONS 1 Echangeur de chaleur en cuivre, pour des chauffe-eau montés sur des murs, caractérisé par le fait qu'il est protégé par un revêtement de résine de silicone contenant comme  1 Copper heat exchanger, for water heaters mounted on walls, characterized in that it is protected by a coating of silicone resin containing as pigment un mélange d'oxyde de fer et de graphite.  pigment a mixture of iron oxide and graphite. 2 Procédé pour appliquer un revêtement protecteur à l'échangeur de chaleur selon la revendication 1, caractérisé par les étapes successives suivantes: ajustage de la viscosité en coupelle Ford N O 4 du revêtement par dilution appropriée avec du solvant à une plage comprise entre 40 à 55 secondes; maintien de l'échangeur de chaleur afin qu'il soit protégé dans le bain de revêtement, agité de façon appropriée à ladite viscosité, pendant un temps compris entre et 30 seco:: È;: ça au séchage de la couche de revêtement appliquée à l'échangeur de chaleur à l'air pendant un temps qui ne soit pas inférieur à 30 minutes; et, finalement, polymérisation de ladite couche de revêtement dans un four entre 100 'C et 190 'C pendant un temps qui ne soit pas inférieur  2 A method for applying a protective coating to the heat exchanger according to claim 1, characterized by the following successive steps: adjusting the viscosity in a Ford NO 4 cup of the coating by appropriate dilution with solvent to a range between 40 to 55 seconds; maintenance of the heat exchanger so that it is protected in the coating bath, agitated in an appropriate manner with said viscosity, for a time between and 30 seco :: È ;: that upon drying of the coating layer applied to the heat exchanger in air for a time not less than 30 minutes; and, finally, polymerization of said coating layer in an oven between 100 ° C. and 190 ° C. for a time which is not less à 30 minutes.30 minutes. 3 Procédé pour appliquer un revêtement protecteur, selon la revendication 2, caractérisé par l'immersion de l'échangeur de chaleur pendant 20 secondes dans un bain dudit revêtement dilué à une viscosité en coupelle Ford NO 4 de 42 secondes, puis par le séchage de la couche de revêtement appliquée à l'échangeur de chaleur pendant 30 minutes à l'air, et, finalement, par la polymérisation de ladite couche de revêtement dans un four pendant 30 minutes à 1650 C.  3 A method for applying a protective coating according to claim 2, characterized by immersing the heat exchanger for 20 seconds in a bath of said coating diluted to a viscosity in Ford NO 4 cup of 42 seconds, then by drying the coating layer applied to the heat exchanger for 30 minutes in air, and, finally, by the polymerization of said coating layer in an oven for 30 minutes at 1650 C.
FR919107590A 1990-06-22 1991-06-20 IMPROVED COPPER HEAT EXCHANGER FOR WALL-MOUNTED WATER HEATERS. Expired - Fee Related FR2663725B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT02073990A IT1248980B (en) 1990-06-22 1990-06-22 PERFECTED COPPER HEAT EXCHANGER FOR WALL BOILERS

Publications (2)

Publication Number Publication Date
FR2663725A1 true FR2663725A1 (en) 1991-12-27
FR2663725B1 FR2663725B1 (en) 1994-03-04

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Country Status (8)

Country Link
BE (1) BE1005573A3 (en)
CH (1) CH682258A5 (en)
DE (1) DE4120563A1 (en)
ES (1) ES2048032B1 (en)
FR (1) FR2663725B1 (en)
GB (1) GB2245276B (en)
IT (1) IT1248980B (en)
NL (1) NL193471C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1300543C (en) * 2003-10-22 2007-02-14 北京化工大学 Method for corrosion resistant protection of condensed water system
DE102006054723A1 (en) * 2006-11-21 2008-05-29 Behr Gmbh & Co. Kg Heat exchanger, in particular exhaust gas heat exchanger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2400962A1 (en) * 1973-01-09 1974-07-11 Jarl Hardenfelt PAINTING OR COATING MATERIAL
EP0110486A1 (en) * 1982-12-07 1984-06-13 Pyrotec N.V. Installation (plant) for thermo-cracking a hydrocarbon starting material to alkene, shell and tube heat exchanger for use in such an installation and process for manufacturing shell and tube heat exchanger
JPS60171349A (en) * 1984-02-16 1985-09-04 Matsushita Electric Ind Co Ltd Heat exchanger
US4582727A (en) * 1984-03-20 1986-04-15 Amax Inc. Varnish-bonded, carbon-coated metal products
JPH024195A (en) * 1988-06-20 1990-01-09 Furukawa Electric Co Ltd:The Copper or copper alloy u-tube coated with inner surface anti-corrosion coating film for heat exchanger

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3380836A (en) * 1965-08-13 1968-04-30 Interchem Corp Corrosion inhibiting pigment
ES364354A1 (en) * 1968-03-05 1970-12-16 Hutter Kg S Treatment of metal surfaces
JPS5690853A (en) * 1979-12-25 1981-07-23 Toray Silicone Co Ltd Silicone rubber composition
DK559887A (en) * 1986-11-28 1988-05-29 Hoffmann La Roche PROCEDURE FOR THE PREPARATION OF CARBINOOL DERIVATIVES

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2400962A1 (en) * 1973-01-09 1974-07-11 Jarl Hardenfelt PAINTING OR COATING MATERIAL
EP0110486A1 (en) * 1982-12-07 1984-06-13 Pyrotec N.V. Installation (plant) for thermo-cracking a hydrocarbon starting material to alkene, shell and tube heat exchanger for use in such an installation and process for manufacturing shell and tube heat exchanger
JPS60171349A (en) * 1984-02-16 1985-09-04 Matsushita Electric Ind Co Ltd Heat exchanger
US4582727A (en) * 1984-03-20 1986-04-15 Amax Inc. Varnish-bonded, carbon-coated metal products
JPH024195A (en) * 1988-06-20 1990-01-09 Furukawa Electric Co Ltd:The Copper or copper alloy u-tube coated with inner surface anti-corrosion coating film for heat exchanger

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 10 (M-446)(2067) 16 Janvier 1986 & JP-A-60 171 349 ( MATSUSHITA DENKI SANGYO KK ) 4 Septembre 1985 *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 135 (M-949)14 Mars 1990 & JP-A-02 004 195 ( FURUKAWA ELECTRIC CO LTD ) 9 Janvier 1990 *

Also Published As

Publication number Publication date
NL9101073A (en) 1992-01-16
IT9020739A0 (en) 1990-06-22
DE4120563A1 (en) 1992-01-02
BE1005573A3 (en) 1993-11-09
IT1248980B (en) 1995-02-11
DE4120563C2 (en) 1993-04-29
ES2048032A1 (en) 1994-03-01
IT9020739A1 (en) 1991-12-22
NL193471B (en) 1999-07-01
NL193471C (en) 1999-11-02
GB2245276B (en) 1994-04-13
GB9113025D0 (en) 1991-08-07
FR2663725B1 (en) 1994-03-04
CH682258A5 (en) 1993-08-13
ES2048032B1 (en) 1994-10-01
GB2245276A (en) 1992-01-02

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