EP1143206A2 - Echangeur de chaleur pour chaudière ou chauffe-eau instantané - Google Patents

Echangeur de chaleur pour chaudière ou chauffe-eau instantané Download PDF

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Publication number
EP1143206A2
EP1143206A2 EP01810336A EP01810336A EP1143206A2 EP 1143206 A2 EP1143206 A2 EP 1143206A2 EP 01810336 A EP01810336 A EP 01810336A EP 01810336 A EP01810336 A EP 01810336A EP 1143206 A2 EP1143206 A2 EP 1143206A2
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
coating
boiler
combustion chamber
instantaneous water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01810336A
Other languages
German (de)
English (en)
Other versions
EP1143206A3 (fr
Inventor
Jörg Füllemann
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.)
Vth Verfahrentechnik fur Heizung AG
Original Assignee
Vth Verfahrentechnik fur Heizung AG
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 Vth Verfahrentechnik fur Heizung AG filed Critical Vth Verfahrentechnik fur Heizung AG
Publication of EP1143206A2 publication Critical patent/EP1143206A2/fr
Publication of EP1143206A3 publication Critical patent/EP1143206A3/fr
Withdrawn legal-status Critical Current

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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
    • F28F19/02—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
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F24H1/43—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/0036—Dispositions against condensation of combustion products
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration

Definitions

  • the invention relates to a heat exchanger for boilers or water heaters according to the The preamble of claim 1.
  • the invention also relates to one with such a heat exchanger equipped boiler or instantaneous water heater.
  • Boilers or instantaneous water heaters are increasingly being used to heat single and multi-family houses that are optimized for calorific value, have low emissions and because of Their space-saving and elegant design can also be set up in the living area Boilers are known for example from WO 98/43019.
  • the boiler described there has a housing enclosing a boiler room, in which a jacket-shaped heat exchanger is arranged, which divides the boiler room into a combustion chamber and an exhaust gas chamber and has passages for hot combustion gases distributed over the lateral surface A burner head surrounded by a cylindrical flame tube projects into the combustion chamber.
  • the heat exchanger comprises a number of spaced-apart, helically wound tubes which enclose the combustion chamber and to one inlet and one Discharge are connected.
  • the heat exchanger consists of a number of heat exchanger elements joined together, which are connected in parallel or in series.
  • the heat exchanger elements are characterized, among other things, by a flattened tube cross-section, which means the exchange surface is enlarged compared to round cross sections. Such one Heat exchange is described for example in WO 94/16272.
  • a recognized problem with boilers and instantaneous water heaters is the susceptibility to corrosion the metallic ones arranged inside or adjacent to the combustion chamber Components, especially the heat exchanger. This is partly attributed to that in modern boilers with a lower boiler temperature, water vapor often already condensed in the combustion chamber This is mainly attempted to counteract that Silicon-alloyed aluminum is used as the material for the heat exchanger. The independent corrosion that still occurs is caused by a correspondingly larger wall thickness the tubes of the heat exchanger compensated. Aside from their increased weight, such Heat exchangers have a lower degree of heat transfer due to the greater wall thickness of their pipes on. In addition, these known heat exchangers are relatively expensive.
  • Stainless steel heat exchangers often come in the compact design desired today for use. These are characterized by very good heat transfer properties and their relatively light weight. To deal with the problem of corrosion, stainless steel would be desirable. High-alloy, stainless steels are expensive to manufacture and only relative elaborately processable. This is particularly evident in the manufacture of pipes that should also be bent like a screw, noticeable. Therefore, one has tried so far Correct the problem of corrosion in heat exchangers mainly by changing the environment in the Combustion chamber is controlled, for example chlorides can be avoided and the sulfur and Nitrogen content in the fuel gases is optimized. As experience shows, these are attempts only a modest success in avoiding corrosion.
  • the object of the present invention is therefore to overcome these disadvantages of the boiler or instantaneous water heater to remedy the state of the art.
  • the arranged within the combustion chamber or on these adjacent metallic components, in particular the heat exchanger should have improved corrosion resistance.
  • the heat exchanger should have a good degree of heat transfer have a relatively low weight.
  • the heat exchanger should be simple and be inexpensive to manufacture and especially for use in compact, calorific value optimized Boilers and instantaneous water heaters should be suitable.
  • the invention provides a heat exchanger, especially for boilers or water heaters, proposed which comprises at least one metallic tube which is arranged at a distance from one another, has screw-like windings and with inlet and outlet connections is equipped for a heat exchange medium.
  • the outer surface of the pipe jacket is covered with a thermally conductive largely pore-free coating provided, the high temperature resistant, electrical poorly conductive to insulating and preferably hydrophobic.
  • the coating is in itself a contradiction striving to achieve the highest possible degree of heat transfer. Can do that also the thermal conductivity of the coating does not change.
  • the coating is in essentially non-porous, which hinders the corrosion attack.
  • the coating according to the invention is poorly conductive to insulating. This is in contrast to the known ones, for example applied by galvanizing, metallic coatings that result in a cathodic Protective effect of the base metal.
  • the coating of the metallic heat exchanger with an electrically poorly conductive to insulating layer prevents on the surface of the heat exchange the attack by radicals caused by the high voltage when pre or when igniting in a boiler or instantaneous water heater.
  • the coating advantageously also has a hydrophobic coating Surface on.
  • the Coating according to the invention also makes it less possible as a material for the heat exchanger to use high alloy materials. This simplifies the manufacturing process and reduces costs the heat exchanger as a whole.
  • the coating of the Heat exchanger a layer thickness of about 2 microns to about 15 microns, preferably about 5 microns to about 10 ⁇ m, as appropriate.
  • the coating is at least exposed to heat radiation is transparent.
  • the coating is also advantageous against visible light transparent. This enables simple visual control of the condition of the Outer jacket of the heat exchanger.
  • amorphous surface has been found for the required, largely non-porous surface of the coating Structure of the coating is an advantage.
  • the Coating is glass-like. It advantageously includes glass formers, for example Silicon dioxide and / or boron trioxide and / or phosphorus pentoxide and / or the like, in the form of Nanoparticles.
  • the coating is applied to the surface of the heat exchanger Dipping process as beneficial.
  • the immersion process is in view of the dimensions of the Heat exchanger can be carried out relatively easily and inexpensively.
  • the coating can be a single layer. However, it can also have two or more individual layers include. This offers the advantage that the individual layers are constructed differently be able to meet the specific requirements for the coating.
  • the outermost layer can additionally be provided with functional surface groups be responsible for increased abrasion resistance of the coating.
  • the measure a surface with a coating that protects against corrosion and erosion is of particular interest in boilers or instantaneous water heaters. Own this a housing enveloping a boiler room, in which a jacket-shaped heat exchanger is arranged is.
  • the heat exchanger divides the boiler room into a combustion chamber and an exhaust gas chamber. Passages for hot combustion gases are provided over the lateral surface. A burner head protrudes into the combustion chamber. With such devices, it proves advantageous to if the components projecting into or adjoining the combustion chamber are at least at Part are provided with a coating, which is analogous to the coating of the Heat exchanger is formed.
  • the heat exchanger is advantageously a split spiral heat exchanger, which is coated according to one of the variants described.
  • FIG. 1 is a schematically simplified illustration of an example of a device according to the invention equipped boiler or instantaneous water heater, all of which are provided with the reference number 1 is.
  • An approximately cylindrical housing 2 for example, envelops a boiler space through a Heat exchanger 11 into an internal combustion chamber 8 and an outer exhaust gas chamber 9 is divided. Passages 10 in the jacket-shaped heat exchanger 11 allow the passage of hot combustion gas from the combustion chamber 9 into the exhaust gas chamber 9.
  • a burner 3 with the associated units is indicated on one end wall of the housing 2.
  • the burner head 4 protrudes into the combustion chamber 8 and is according to the illustrated embodiment of the boiler or instantaneous water heater 1 surrounded by a cylindrical flame tube 5, that extends to the opposite end wall is in front of the opposite end wall a deflection part 6 for the flame generated by the burner head 4 is arranged.
  • the exact structure and the function of the flame tube 5 and the deflection part 6 is the subject of WO 98/043019 and is not relevant for the explanation of the invention.
  • Behind the deflection part 6 is in the housing 2, an exhaust gas opening 7 is left open, through which the exhaust gas enters a chimney or an exhaust pipe can leak.
  • the heat exchanger 11 can be formed in one piece. It can also consist of several heat exchanger units be composed, which are interconnected in parallel or in series.
  • Fig. 2 schematically shows such a heat exchanger or a heat exchanger unit 11. It comprises a tube 12 with a flattened, approximately oval cross-section, the screw-like, in Has spaced windings 13.
  • the windings 13 are formed by spacer ribs 16, which are formed on the tube outer surface, kept at a distance. It can additional spacers 17 may also be provided so that the distance between the windings 13 remains.
  • the gaps between the windings form the passages 10 for the hot combustion gases.
  • At the two ends of the tube 12 are a supply connection 14 and a discharge connection 15 are provided for a heat exchange medium.
  • Heat exchanger 11 is known under the name of split spiral heat exchanger. Its structure, its function and the process for its production is detailed in WO 94/16272 described, so that a more detailed explanation can be omitted here.
  • the flow channel 18 for the heat exchange medium recognizable. According to the outer contour of the tube 12, the flow channel also has 18 has a flattened, approximately oval cross section. A coating on the outer surface of the tube 12 is indicated by the reference number 19.
  • FIG. 3 schematically shows a section of a cross section of the tube 12 of the heat exchanger.
  • the tube 12 encloses the flattened, approximately oval flow channel 18 for the heat exchange medium.
  • the coating on the outside of the jacket is designated 19 and for clarification shown in the illustration with exaggerated layer thickness t. In truth it is Layer thickness t only about 2 microns to about 15 microns, preferably about 5 microns to about 10 microns.
  • the whole Coating 19 can be present as a single layer, but it can also consist of two or more Individual layers should be built up.
  • the coating 19 envelops the outer surface of the jacket Heat exchanger 11 as completely as possible to contain corrosive and / or erosive components of the boiler room to offer no means of attack.
  • the coating is preferably carried out in a dipping process.
  • the coating 19 is glass-like and made in nanotechnology. It preferably comprises nanoparticles of glass formers, such as silicon dioxide, which are chemically integrated into organic and / or inorganic molecular networks. Such Coating techniques in nanotechnology are, for example, from NMO Saarbrükken, Advertised and offered in Helmerswald 2, D-66121 Sar Hampshiren, Germany.
  • the coating 19 of the outer jacket surface of the heat exchanger 11 is preferably amorphous Structure. It is essentially non-porous, temperature-resistant and poorly electrically conductive up to insulating.
  • the coating 19 has a preferably hydrophobic surface around the precipitate to prevent corrosive condensates.
  • the coating is thermally conductive and especially permeable to heat radiation.
  • the coating is in a preferred variant also transparent to visible light.
  • the coating according to the invention is explained using the example of a coated heat exchanger been. It goes without saying that an analogous type of coating also applies to the others in the Combustion chamber arranged, metallic components can be applied. In particular, can the burner head projecting into the combustion chamber may be coated in the manner described Avoid corrosion and / or corrosive erosion.

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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)
  • Combustion & Propulsion (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Details Of Fluid Heaters (AREA)
EP01810336A 2000-04-03 2001-04-03 Echangeur de chaleur pour chaudière ou chauffe-eau instantané Withdrawn EP1143206A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6472000 2000-04-03
CH20000647 2000-04-03

Publications (2)

Publication Number Publication Date
EP1143206A2 true EP1143206A2 (fr) 2001-10-10
EP1143206A3 EP1143206A3 (fr) 2003-05-02

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EP01810336A Withdrawn EP1143206A3 (fr) 2000-04-03 2001-04-03 Echangeur de chaleur pour chaudière ou chauffe-eau instantané

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005052489A2 (fr) * 2003-11-26 2005-06-09 Behr Gmbh & Co. Kg Echangeur de chaleur
EP1600708A1 (fr) * 2004-05-25 2005-11-30 Riello S.p.a. Méthode de production d'une chaudière à gaz et une telle chaudière à gaz
WO2006029616A1 (fr) * 2004-09-17 2006-03-23 Peter Vinz Paroi thermoconductrice a revetements superficiels nanostructures multifonctionnels
ITMI20100589A1 (it) * 2010-04-08 2011-10-09 Riello Spa Scambiatore di calore e metodo per realizzare tale scambiatore di calore
ITMI20100625A1 (it) * 2010-04-13 2011-10-14 Riello Spa Metodo per realizzare uno scambiatore di calore e scambiatore di calore realizzato con tale metodo
IT201900004753A1 (it) * 2019-03-29 2020-09-29 Immergas Spa Scambiatore di calore

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994016272A1 (fr) 1993-01-15 1994-07-21 Joseph Le Mer Element echangeur de chaleur, procede et dispositif pour le fabriquer
WO1998043019A1 (fr) 1997-03-24 1998-10-01 Vth Verfahrenstechnik Für Heizung Ag Chaudiere de chauffage equipee d'un bruleur

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424238A (en) * 1967-05-08 1969-01-28 Ritter Pfaudler Corp Glassed heat exchanger construction
DE3405768A1 (de) * 1984-02-17 1985-08-22 Asta Ullrich GmbH Annweiler am Trifels, 6747 Annweiler Emailliertes blech
DE19644692A1 (de) * 1996-10-28 1998-04-30 Abb Patent Gmbh Beschichtung sowie ein Verfahren zu deren Herstellung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994016272A1 (fr) 1993-01-15 1994-07-21 Joseph Le Mer Element echangeur de chaleur, procede et dispositif pour le fabriquer
WO1998043019A1 (fr) 1997-03-24 1998-10-01 Vth Verfahrenstechnik Für Heizung Ag Chaudiere de chauffage equipee d'un bruleur

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005052489A2 (fr) * 2003-11-26 2005-06-09 Behr Gmbh & Co. Kg Echangeur de chaleur
WO2005052489A3 (fr) * 2003-11-26 2005-07-28 Behr Gmbh & Co Kg Echangeur de chaleur
EP1600708A1 (fr) * 2004-05-25 2005-11-30 Riello S.p.a. Méthode de production d'une chaudière à gaz et une telle chaudière à gaz
CN100458303C (zh) * 2004-05-25 2009-02-04 列洛公开有限公司 燃气锅炉的制造方法以及如此制造的燃气锅炉
WO2006029616A1 (fr) * 2004-09-17 2006-03-23 Peter Vinz Paroi thermoconductrice a revetements superficiels nanostructures multifonctionnels
ITMI20100589A1 (it) * 2010-04-08 2011-10-09 Riello Spa Scambiatore di calore e metodo per realizzare tale scambiatore di calore
ITMI20100625A1 (it) * 2010-04-13 2011-10-14 Riello Spa Metodo per realizzare uno scambiatore di calore e scambiatore di calore realizzato con tale metodo
WO2011128764A1 (fr) * 2010-04-13 2011-10-20 Riello S.P.A. Procédé de fabrication d'un échangeur de chaleur et échangeur de chaleur fabriqué à l'aide d'un tel procédé
IT201900004753A1 (it) * 2019-03-29 2020-09-29 Immergas Spa Scambiatore di calore

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