EP0056108B1 - Heizkessel für Niedertemperatur-Heizungen - Google Patents

Heizkessel für Niedertemperatur-Heizungen Download PDF

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Publication number
EP0056108B1
EP0056108B1 EP81109797A EP81109797A EP0056108B1 EP 0056108 B1 EP0056108 B1 EP 0056108B1 EP 81109797 A EP81109797 A EP 81109797A EP 81109797 A EP81109797 A EP 81109797A EP 0056108 B1 EP0056108 B1 EP 0056108B1
Authority
EP
European Patent Office
Prior art keywords
boiler
thermal conductivity
flue gas
coating
heating
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.)
Expired
Application number
EP81109797A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0056108A1 (de
Inventor
Gustav Dr. Techn. H.C. Ospelt
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.)
Hoval Interliz AG
Original Assignee
Hoval Interliz 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6122578&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0056108(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hoval Interliz AG filed Critical Hoval Interliz AG
Priority to AT81109797T priority Critical patent/ATE8704T1/de
Publication of EP0056108A1 publication Critical patent/EP0056108A1/de
Application granted granted Critical
Publication of EP0056108B1 publication Critical patent/EP0056108B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/28—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
    • F24H1/287—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes with the fire tubes arranged in line with the combustion chamber
    • 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

Definitions

  • the invention relates to a boiler for low-temperature heaters with a boiler water jacket surrounding a combustion chamber for burner firing and a downstream flue gas duct.
  • Low-temperature heaters such as ceiling or floor heating
  • a low heating water temperature which is only a maximum of about 50 to 53 ° C, even at low outside temperatures.
  • the aim is to use a boiler for such heating systems, which can also be operated in this low-temperature range, for example in order to reduce the boiler heat losses and to save expensive mixing valve devices and controls.
  • the boiler is now operated with a boiler water temperature that changes according to the outside temperature, and if the boiler water temperature is only between about 25 and 28, especially in the transition season at the so-called heating limit, i.e.
  • the dew point limit is at a wall temperature of around 40 to 45 ° C, which is far below the above-mentioned low boiler water temperature.
  • the invention consists in that the steel sheet walls of the combustion chamber and the flue gas duct, i.e. all boiler parts covered by the burner flame and the flue gases, are provided on the boiler water side with a coating of a poorly heat-conducting material, the thermal conductivity of which is less than 1.
  • the deliberate deterioration of the heat conduction with the water-side coating according to the invention due to the two-layered boiler walls depends on the coefficient of thermal conductivity of the coating material used, on the coating thickness on the boiler water side and on the heat flow going through the boiler walls and can be varied depending on the requirements and by a material with the lowest possible coefficient of thermal conductivity should be such that the desired or required increase in wall temperature on the flue gas side occurs even with a thin coating thickness.
  • the coating can consist of a sufficiently heat-resistant polyamide plastic which has a coefficient of thermal conductivity of 0.3 or less.
  • the coating thickness only needs to be a fraction of a millimeter in order to ensure that at a boiler water temperature of, for example, 25 to 28 ° C and at an average heat flow density (specific heating surface load) for boilers, a flue gas-side wall temperature increase of around 25 ° C occurs , so that the sheet steel wall on the flue gas side assumes a surface temperature of around 50 ° C, which is above the dew point limit when firing with light heating oil.
  • the heat flow density averages around 12300 kcal per square meter and per hour. The heat flow density in the combustion chamber is naturally higher and is on average 26600.
  • the coating is attached to the water side of the boiler walls, it is also absolutely protected against mechanical damage when cleaning the boiler on the flue gas side, so that the coating can also be made of enamel, which, in contrast to the known flue gas side enamel coatings, does not pose any risk of Crack formation is exposed to high flue gas temperature changes, but due to the arrangement on the water side and deterioration of the heat conduction, it is far better prevented that the temperature falls below the dew point and condensation water on the flue gas side of the boiler walls.
  • Enamel is also a relatively poorly heat-conducting material with a coefficient of thermal conductivity less than 1. Since the coefficient of thermal conductivity is approximately 0.9 greater than that of polyamide plastic, the thickness of the enamel coating must also be greater.
  • a water-side enamel coating of 1 mm thickness is sufficient to ensure that a flue gas-side wall temperature increase of around 30 ° C occurs and the wall temperature with around 55 ° C far above the dew point limit.
  • the drawing shows an embodiment of the boiler according to the invention in a vertical longitudinal section.
  • the boiler contains a combustion chamber 1 and a downstream flue gas duct 2, which are surrounded and cooled by a common boiler water jacket 3. All of the water-cooled steel plate walls of the boiler, which are smeared on the flue gas side by the burner flame or the flue gases, are provided on the boiler water side with a coating 4 made of a poorly heat-conducting material which, compared to the heat conductivity number of the steel plate walls of approximately 48, has a thermal conductivity number of less than 1.
  • the coating consists of a commercially available polyamide plastic that has a thermal conductivity of at most 0.3.
  • the layer thickness only needs to be at least about 0.3 mm and at most about 0.5 mm in order to obtain a wall temperature increase of around 25 ° C on the flue gas side, which leads to the dew point limit being exceeded when the boiler is operated in the low temperature range.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chimneys And Flues (AREA)
  • Spray-Type Burners (AREA)
  • Details Of Fluid Heaters (AREA)
EP81109797A 1981-01-14 1981-11-20 Heizkessel für Niedertemperatur-Heizungen Expired EP0056108B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109797T ATE8704T1 (de) 1981-01-14 1981-11-20 Heizkessel fuer niedertemperatur-heizungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3100888 1981-01-14
DE19813100888 DE3100888A1 (de) 1981-01-14 1981-01-14 Heizkessel fuer niedertemperatur-heizungen

Publications (2)

Publication Number Publication Date
EP0056108A1 EP0056108A1 (de) 1982-07-21
EP0056108B1 true EP0056108B1 (de) 1984-07-25

Family

ID=6122578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109797A Expired EP0056108B1 (de) 1981-01-14 1981-11-20 Heizkessel für Niedertemperatur-Heizungen

Country Status (3)

Country Link
EP (1) EP0056108B1 (enrdf_load_stackoverflow)
AT (1) ATE8704T1 (enrdf_load_stackoverflow)
DE (1) DE3100888A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0103063A3 (de) * 1982-08-12 1984-09-12 Buderus Aktiengesellschaft Zentralheizungskessel aus Gusseisen
AT399934B (de) * 1991-06-03 1995-08-25 Vaillant Gmbh Brennkammermantel
DE19715918A1 (de) * 1997-04-16 1998-10-22 Andreas P Rosteuscher Vorrichtung zur Erhitzung eines Wärmeträgers

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT127506B (de) * 1931-03-20 1932-03-25 Richard Ing Herrmann Einrichtung zur Verhinderung der Schweißwasserbildung bei gasbeheizten Warmwassererzeugern.
DE705267C (de) * 1934-11-27 1941-04-22 Junkers & Co Waermeaustauscher fuer Wassererhitzer
DE1889560U (de) * 1963-11-23 1964-03-19 Gebrueder Wagner Stehender kessel fuer heisswassererzeugung.
AU4138068A (en) * 1968-07-29 1970-02-05 MRS) FREDA McPHERSON Hot water storage tank and/or boiler
DE2427219A1 (de) * 1974-06-05 1975-12-18 Broetje Fa August Vorrichtung zum vermeiden von schwitzwasserbildung auf der heizgasseite von feuerstaetten, insbesondere heizkesseln
CH628134A5 (de) * 1978-03-28 1982-02-15 Ygnis Sa Rauchgasdurchstroemter waermetauscher.

Also Published As

Publication number Publication date
DE3100888A1 (de) 1982-09-02
DE3100888C2 (enrdf_load_stackoverflow) 1991-05-29
EP0056108A1 (de) 1982-07-21
ATE8704T1 (de) 1984-08-15

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