EP0567199B1 - Brauchwasserkessel - Google Patents

Brauchwasserkessel Download PDF

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Publication number
EP0567199B1
EP0567199B1 EP19930201180 EP93201180A EP0567199B1 EP 0567199 B1 EP0567199 B1 EP 0567199B1 EP 19930201180 EP19930201180 EP 19930201180 EP 93201180 A EP93201180 A EP 93201180A EP 0567199 B1 EP0567199 B1 EP 0567199B1
Authority
EP
European Patent Office
Prior art keywords
water
water tank
tank
coil
hot 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.)
Expired - Lifetime
Application number
EP19930201180
Other languages
English (en)
French (fr)
Other versions
EP0567199A1 (de
Inventor
Johanus Albertus Hendrikus Willemsen
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.)
Heatex BV
Original Assignee
METAAL VRIES BV
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 METAAL VRIES BV filed Critical METAAL VRIES BV
Publication of EP0567199A1 publication Critical patent/EP0567199A1/de
Application granted granted Critical
Publication of EP0567199B1 publication Critical patent/EP0567199B1/de
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
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
    • F24D3/082—Hot water storage tanks specially adapted therefor

Definitions

  • This invention relates to a tap water boiler comprising a closed water tank having a first connection for supplying cold water and a second connection for tapping hot water, as well as a closed tubing placed in the water tank, through which tubing, in operation, hot water provided by a suitable hot water source circulates, wherein said tubing comprises a double wound coil having an outer helically bent tube at some distance from the inner wall of said water tank and an inner helically bent tube.
  • Tap water boilers are known in various embodiments and are normally applied in combination with a central heating tank.
  • the central heating tank is connected with the tubing in the water tank and passes hot water through the tubing under control of a thermostat. Via the tubing, heat of the central heating water is transferred to the tap water in the water tank.
  • another hot water source e.g. a solar collector, is also applicable.
  • the tubing usually consists of a tube bent along a helical line, also referred to as a coil, located in the water tank and extending along the wall thereof.
  • a coil In the prior art tap water boilers, the coil extends over substantially the entire height of the water tank, the supply of hot water to the coil taking place near the bottom of the water tank, and the return to the hot water source taking place from the top of the water tank.
  • the cold water supply is so arranged that the cold water is added to the stock of water in the lower area of the water tank.
  • the hot water tapping point is provided at the top, i.e. the hot water comes from the upper area.
  • a tap water boiler of the type described above comprising a double wound coil which extends over substantially the entire height of the water tank has been disclosed in DE-A-1779233. Even though a double wound coil will provide an improved exchange of heat between the tubing and the water in the water tank, similar drawbacks as described above do exist in this known tap water boiler.
  • European patent application 0 320 678 further discloses a tap water boiler having a coil placed in the space between two concentric bushes, which coil may be a double coil.
  • the outer bush narrows to an ascending pipe having a relatively small diameter, which is provided with lateral outlet openings provided in the ascending pipe wall.
  • the inner bush is closed at the top or the bottom. The hot water tapping point is immediately above the top end of the ascending pipe.
  • the free circulation of the water in the hot water tank is very strongly limited.
  • This effect is increased by the fact that the hot water tapping point is immediately above the top end of the narrowed part of the outer bush.
  • the degree of filling of the boiler is not optimal.
  • the degree of filling of a boiler is connected with the amount of water (measured as a percentage of the total contents of the tank) that can be tapped before the temperature of the water tapped decreases significantly.
  • the object of this invention is to provide an improved tap water boiler in which the above drawbacks do not exist or occur to a lesser degree.
  • the object of the invention is to provide a high-efficiency tap water boiler having a more uniform temperature distribution in the water in the water tank.
  • said double wound coil is mounted completely in the lower half of said water tank, in such a manner that the coil is in Suite contact with the body of water surrounded by the coil and with the water between the coil and the inner wall of said water tank and wherein the water tank is composed of two deep drawn shell portions which are connected by a weld about halfway up of the tank.
  • Fig. 1 is a diagrammatic, cross-sectional representation of a conventional tap water boiler 1 having a closed water tank 2, in which a helically bent tube 3, often referred to as a coil, extends along the inner wall over a great portion of the height of the water tank.
  • the coil 3 has a bottom end 4, which, in operation, is connected via a supply line 5 to a hot water source, such as a central heating furnace for supplying hot water of, e.g., 90°C to the coil.
  • the coil further has a top end 6, from where the central heating water is returned via a return line 7 to the central heating furnace.
  • the return water may have a temperature of, e.g., 70°C.
  • the water tank further has a first connection 8 for supplying cold water from the mains and a second connection 9 for tapping hot water from the water tank.
  • the connection 8 is provided at the top of the water tank, but is connected to a tube 10 extending in the water tank to near the bottom and having an outlet opening at the bottom of the water tank, so that the supply of cold water takes place at the bottom of the water tank.
  • the hot water tapping point 9 is provided at the top of the water tank and also withdraws water from the upper area of the water tank; for the hot water rises in the tank.
  • cold water having a temperature of, e.g., 10-20°C is supplied at the bottom of the water tank.
  • a cold zone continues to exist at the bottom of the water tank, so that the capacity of the water tank is only partly utilized.
  • the water At the top of the water tank, the water is hottest, e.g. 60°C, so that between the cold zone and the upper hot zone there is a transitional area where a temperature in the order of 40°C obtains. This is a temperature at which the legionella bacteria flourish well, which is undesirable. Moreover, in the upper boiler half, a flow hardly occurs in the water, which is conducive to bacteria development and is unfavourable to a uniform temperature distribution in the water.
  • Fig. 2 is a diagrammatic, partly cross-sectional view of an example of a boiler according to the invention.
  • the tap water boiler 20 has a water tank 23 composed of an upper and a lower deep drawn shell portion 21, 22. The two shell portions are welded together about halfway up the tank, as indicated at 24. In the example shown, all connections are arranged at the bottom of the tank, but this is not strictly necessary.
  • a connection for supplying cold water is shown. Inside the water tank, at the level of connection 25, there is provided a deflector means 26 which brings about a distribution of the inflowing cold water.
  • the deflector means is plate-shaped.
  • This tapping point consists of a connecting piece 28 which is connected to a tube 29 extending in the water tank to near the top of the water tank, so that the tapped water comes from the upper area of the tank.
  • the main difference between the boiler of Fig. 1 and that of Fig. 2 is constituted by the tubing connected to the hot water source, such as a central heating furnace.
  • a double wound coil arranged completely in the lower half of the water tank extends between a first connecting point 31 for supplying hot water, provided at the bottom of the water tank, and a connecting point 30 for a return line to the central heating furnace, which, in this example, is likewise provided at the bottom.
  • the double wound coil has an outer portion 32 having a relatively large diameter and an inner portion 33 arranged inside the outer portion and having a smaller diameter.
  • the double wound coil is located exactly in the area of the coldest zone, so that the heat transmission can take place at a maximum efficiency. Thus, a smaller total length of the coil is sufficient in principle.
  • the outer coil 32 is located at some distance from the inner wall of the water tank. This configuration may result in a flow within the water tank, which flow is directed upwards from the area inside the coil, fans out in the upper portion of the water tank, and then returns again along the inner wall of the water tank. Such a circulation flow results in a more uniform water distribution within the water tank. Thus, a real cold zone is avoided, as well as a zone with a temperature favourable to the formation of bacteria and hardly moving water.
  • the effective volume of the water tank may increase to the order of 90% and more of the real tank volume.
  • the central heating water first flows through the inner coil 33 from the bottom upwards and then through the outer coil 32 from the top downwards.
  • This mode of connection is conducive to the formation of a flow in the tap water within the water tank, as described above.
  • the connecting pints 25, 27, 30 and 31 may be passed through the tank wall at other places.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Cookers (AREA)

Claims (4)

  1. Brauchwassererhitzer (20) mit einem geschlossenen Wassertank (22) mit einem ersten Anschluß (25) zum Zuleiten von kaltem Wasser, einem zweiten Anschluß (28)zum Zapfen warmen Wassers sowie einer geschlossenen Rohrleitung (32, 33) in dem Wassertank (23), durch welche im Betrieb von einer geeigneten Warmwasserquelle geliefertes warmes Wasser zirkuliert, wobei die Rohrleitung eine doppelte gewundene Spule mit einem äußeren wendelförmig gebogenen Rohr (32), das sich in einigem Abstand von der Innenwand des Wassertanks befindet, und einem inneren wendelförmig gebogenen Rohr (31), wobei die doppelte gewundene Spule vollständig in der unteren Hälfte (22) des Wassertanks (23) derart angebracht ist, daß die Spule in direktem Kontakt mit dem von der Spule umgebenen Wasser und mit dem Wasser zwischen der Spule und der Innenwand des Wassertanks (23) ist, und wobei der Wassertank aus zwei tiefgezogenen Gehäusebereichen (21, 22) besteht, die durch eine ungefähr in der Hälfte des Tapks (23) befindliche Schweißnaht (24) verbunden sind.
  2. Brauchwassererhitzer nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, daß die Rohrleitung (32, 33) derart angeschlossen ist, daß im Betrieb das von der Warmwasserquelle gelieferte Wasser zuerst von unten aufwärts durch das innere wendelförmig gebogene Rohr (33) strömt und anschließend von oben durch das äußere wendelförmig gebogene Rohr (32) abwärts strömt.
  3. Brauchwassererhitzer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Anschlüsse für die Rohrleitung (32, 33) und zum Zuleiten kalten Wassers sowie zum Zapfen warmen Wassers im Boden des unteren Gehäuseteils (22) angeordnet sind.
  4. Brauchwassererhitzer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Anschluß (28) zum Zapfen warmen Wassers in dem unteren Teil (22) des Wassertanks (23) angeordnet und mit einem Rohr (29) versehen ist, das sich in dem Wassertank (23) bis nahe an dessen Oberwand erstreckt.
EP19930201180 1992-04-23 1993-04-22 Brauchwasserkessel Expired - Lifetime EP0567199B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9200745 1992-04-23
NL9200745A NL9200745A (nl) 1992-04-23 1992-04-23 Tapwaterboiler.

Publications (2)

Publication Number Publication Date
EP0567199A1 EP0567199A1 (de) 1993-10-27
EP0567199B1 true EP0567199B1 (de) 1997-03-12

Family

ID=19860730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930201180 Expired - Lifetime EP0567199B1 (de) 1992-04-23 1993-04-22 Brauchwasserkessel

Country Status (3)

Country Link
EP (1) EP0567199B1 (de)
DE (1) DE69308624T2 (de)
NL (1) NL9200745A (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1779233A1 (de) * 1968-07-20 1971-11-04 Junkers & Co Brauchwasserspeicher
DE8716433U1 (de) * 1987-12-12 1989-04-13 Viessmann, Hans, Dr., 3559 Battenberg, De

Also Published As

Publication number Publication date
NL9200745A (nl) 1993-11-16
DE69308624D1 (de) 1997-04-17
DE69308624T2 (de) 1997-10-02
EP0567199A1 (de) 1993-10-27

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