EP0445889B1 - Chaudière pour le chauffage central et la production d'eau chaude - Google Patents

Chaudière pour le chauffage central et la production d'eau chaude Download PDF

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Publication number
EP0445889B1
EP0445889B1 EP91200472A EP91200472A EP0445889B1 EP 0445889 B1 EP0445889 B1 EP 0445889B1 EP 91200472 A EP91200472 A EP 91200472A EP 91200472 A EP91200472 A EP 91200472A EP 0445889 B1 EP0445889 B1 EP 0445889B1
Authority
EP
European Patent Office
Prior art keywords
water
heating
tank
heat exchanger
submerged
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 - Lifetime
Application number
EP91200472A
Other languages
German (de)
English (en)
Other versions
EP0445889A1 (fr
Inventor
J.H. Deckers
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.)
Robert Bosch GmbH
Original Assignee
DEJATECH BV
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Filing date
Publication date
Application filed by DEJATECH BV filed Critical DEJATECH BV
Publication of EP0445889A1 publication Critical patent/EP0445889A1/fr
Application granted granted Critical
Publication of EP0445889B1 publication Critical patent/EP0445889B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water

Definitions

  • This invention relates to a gas-fired central-heating and water-heating boiler, comprising the features recited in the pre-characterizing part of claim 1 and as disclosed in DE-A- 21 59 827.
  • a combined central-heating/hot-water appliance comprising the same features and described in GB-A-2 220 052, is designed for installation in boats or caravans and accordingly has a limited capacity regarding both heating and the supply of hot domestic water. This appears among other things from the small diameter of the heat exchanger tube which forms a flue gas duct arranged helically around the combustion chamber of the burner.
  • This invention relates to a combined central-heating/hot-water appliance designed for dwelling houses and similar residences, where different requirements apply with respect to its capacity and especially its efficiency.
  • Both can be arranged adjacent to the central heating boiler and in principle in both cases elsewhere (in the central heating boiler) water is heated for a specific purpose, namely the heating of space, and this water also heats water that is being supplied for a different purpose (domestic use).
  • a cylindrical combustion chamber extends concentrically into a boiler vessel, a hot water tapping coil surrounds the combustion chamber in the boiler vessel.
  • the known conventional combined central-heating/domestic water boilers have the drawback that the capacity of the domestic water appliance is often on the short side. The reason is that, at a given boiler capacity, it is required that in any event the heat necessary for maintaining a living space at a given temperature be supplied.
  • Another important drawback of the known combined boilers is the long so-called convenience waiting time, i.e. it takes a long time (0.5-0.75 min) for hot water to flow from the tap after the hot-water tap has been turned on.
  • the invention is based on the idea that houses are increasingly better insulated and that accordingly the ratio of central heating water to domestic water can be adjusted in favour of domestic water. It is therefore an object of the invention to provide a novel central heating boiler which, while being of compact construction and of environmentally friendly design, is suitable for normal heating of houses and has a comparatively large capacity regarding the supply of water for domestic use.
  • the basic principle of the invention is that the burner chamber and the heat exchanger are formed as a compact U-shaped unit cast in one piece from an aluminum alloy, with the ratio of the water mass, in litres, that surrounds the submerged U-shaped unit (22,23) in the tank, to the mass of the submerged U-shaped unit, in kilograms, being greater than 1 and the heat exchanger being provided with fins enlarging the heating surface.
  • Said ratio of water in the tank to the aluminum mass submerged therein, is important.
  • the burner-and-heat-exchanger unit With a view to a compact construction of the burner-and-heat-exchanger unit, it is a U-shape construction, being mounted at the top of one leg of the U a burner with means for forcing a combustible gas/air mixture downwards into the burner and the lower end of said leg, and the other leg of the U being formed as heat exchanger for exchange with the water mass which the assembly is submerged in.
  • the element may be a plug of slight mass in the wall of the U, which plug may also be used as core support when casting the U-tube with lost core.
  • Figs 1 and 2 respectively, show a hot water tank 1 of a tapping or through-flow boiler and a hot water tank 2 of a storage boiler.
  • the tank 1 is filled with water of the central heating circuit which is supplied via pipe 3 and is discharged via pipe 4 by the circulation pump (not shown) of the central heating boiler.
  • Extending helically through the tank 1 is a tube 5 which at the end 6 is connected to the water mains and at the other end is provided with a tap 7.
  • the tank 2 is filled with water from the mains that is supplied via the pipe 8 and the tank is further connected to a tap 9.
  • the mains water in the tank 2 is heated by a coil 10 which is connected to the central heating circuit via pipes 11 and 12.
  • heat is circulated from the central heating boiler via pipes 3,4, and 11,12, respectively, in a tank arranged in spaced relationship to the source of heat, namely the heat exchanger of the central heating boiler.
  • a tank 13 is included in the closed central heating water circuit, namely via a circulation pump 14 connected to the return pipe 15, 15a and via a threeway valve 16 to the pressure pipe 17a,17 leading to radiators or similar space-heating elements.
  • the threeway valve 16 is connected to the delivery side of the pump 14 via a bypass 18.
  • a tube coil 19 which via conduits 20 and 21 (via a mixing valve M) is connected to the water mains system and to a tap (neither being shown).
  • a mixing valve M is connected to the water mains system and to a tap (neither being shown).
  • Submerged in the tank 13 is a one-piece assembly of a burner 22 and a U-shaped heat exchanger 23.
  • the heat exchanger 23 is connected to a flue 24 for combustion gases.
  • the burner 22 is included in a combustion chamber 25 provided at the top of one leg of the U-shaped heat exchanger 23.
  • the burner is fed with a gas/air mixture by a fan 26 and a gas valve 27.
  • the combustion gases are forced through the U-shaped heat exchanger towards the flue 24. During this process the heat transfer to the water in the tank 13 is promoted by virtue of the fact that fins 28 have been formed on the heat exchanger, which enlarge the heating surface.
  • Return water from the central heating circuit is forced from the return pipe 15 through the circulation pump 14 and the extended return pipe 15a into the tank 13 and returned via the standpipe 17a and the supply pipe 17 into the central heating circuit.
  • the central heating water is heated by the assemby of heat exchanger 23 and burner 22 directly submerged therein.
  • the hot water in the tank 13 forms at the same time the source of heat for domestic water in the coil 19.
  • the heat transfer to the living space via the supply pipe 17 can be temporarily interrrupted by virtue of the threeway valve 16 being switched to short-circuiting the delivery side of the circulation pump 14 and the supply pipe 17 via the bypass 18. In that event, the central heating water will be recirculated through the radiators, bypassing the boiler.
  • a combined boiler according to the invention with a burner capacity of approx. 25 kW, a gross tank volume of 35 litres, while the burner/heat exchanger unit has a water displacement of 16 litres, when domestic water is being tapped, during the first two minutes, water will be tapped of a temperature which decreases from approx. 85° to approx. 68°C and in the mixing valve M, cold mains water can be added so as to maintain the desired tapping temperature of 60°C. During the next 12 minutes, the tapping temperature decreases to approx. 60°C and gradually a lesser quantity of cold water can be added. Tapping at 60°C can be continued indefinitely.

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  • 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)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Central Heating Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Claims (4)

  1. Une chaudière à gaz pour chauffage central et eau chaude, dans laquelle un brûleur et un échangeur de chaleur sont immergés dans un réservoir d'eau qui est une partie du circuit fermé d'eau de chauffage central et dans lequel un serpentin de soutirage relié au réseau d'eau pour l'eau chaude à usage domestique, est installé dans le réservoir d'eau, caractérisée en ce que la chambre de brûleur (22) et l'échangeur de chaleur (23) sont formés comme une unité compacte (22, 23), moulée monobloc en alliage d'aluminium, le rapport entre la masse d'eau, en litres, qui entoure l'unité en forme de U immergée (22, 23) dans le réservoir (13) et la masse de l'unité immergée en forme de U (22, 23) en kilogrammes étant supérieur à 1, l'échangeur de chaleur (23) étant muni d'ailettes (28) augmentant la surface de chauffage.
  2. Une chaudière combinée selon la revendication 1, caractérisée en ce qu'un brûleur (22) est monté au sommet d'une jambe du U avec des moyens (26, 27) refoulant vers le bas un mélange combustible gaz/air dans le brûleur (22) et dans l'extrémité inférieure de ladite jambe et l'autre jambe du U étant formée pour servir d'échangeur de chaleur (23) afin de réaliser l'échange avec la masse d'eau dans laquelle ensemble est immergé.
  3. Une chaudière combinée selon la revendication 1, caractérisée en ce qu'au point le plus bas du U, est agencé un élément (29) en un matériau de conductibilité thermique médiocre comparativement à l'alliage d'aluminium de l'échangeur de chaleur.
  4. Une chaudière combinée selon l'une quelconque des revendications précédentes, caractérisée en ce que le tube de retour (15) et le tube d'alimentation (17) qui relient la chaudière avec les éléments de chauffage d'espace, sont reliés au réservoir (13) respectivement par une pompe (14) et par une valve (16) à trois voies, et en ce que la valve à trois voies (16) est reliée au côté refoulement de la pompe par l'intermédiaire d'un circuit de dérivation 18.
EP91200472A 1990-03-06 1991-03-05 Chaudière pour le chauffage central et la production d'eau chaude Expired - Lifetime EP0445889B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9000511A NL9000511A (nl) 1990-03-06 1990-03-06 Combiketel.
NL9000511 1990-03-06

Publications (2)

Publication Number Publication Date
EP0445889A1 EP0445889A1 (fr) 1991-09-11
EP0445889B1 true EP0445889B1 (fr) 1994-08-31

Family

ID=19856699

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91200472A Expired - Lifetime EP0445889B1 (fr) 1990-03-06 1991-03-05 Chaudière pour le chauffage central et la production d'eau chaude

Country Status (6)

Country Link
EP (1) EP0445889B1 (fr)
AT (1) ATE110839T1 (fr)
DE (1) DE69103650T2 (fr)
DK (1) DK0445889T3 (fr)
ES (1) ES2063433T3 (fr)
NL (1) NL9000511A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102062465A (zh) * 2010-06-30 2011-05-18 艾欧史密斯(中国)热水器有限公司 燃气热水器及其进出水控制方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1922523A1 (de) * 1969-05-02 1971-02-11 Brien John Charles William O Heizkessel
FR2512525A1 (fr) * 1981-09-10 1983-03-11 Collard A Trolart Sa G Appareil de rechauffage d'un liquide a serpentin
FR2580383B1 (fr) * 1985-03-19 1989-10-27 Poujoulat Sa Generateur d'air chaud a production d'eau chaude a condensation
GB8815115D0 (en) * 1988-06-24 1988-08-03 Burco Dean Aplliances Ltd Water heater

Also Published As

Publication number Publication date
DE69103650D1 (de) 1994-10-06
EP0445889A1 (fr) 1991-09-11
NL9000511A (nl) 1991-10-01
ES2063433T3 (es) 1995-01-01
ATE110839T1 (de) 1994-09-15
DE69103650T2 (de) 1994-12-22
DK0445889T3 (da) 1994-10-03

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