EP0355881B1 - Brauchwassererhitzer - Google Patents

Brauchwassererhitzer Download PDF

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Publication number
EP0355881B1
EP0355881B1 EP89201863A EP89201863A EP0355881B1 EP 0355881 B1 EP0355881 B1 EP 0355881B1 EP 89201863 A EP89201863 A EP 89201863A EP 89201863 A EP89201863 A EP 89201863A EP 0355881 B1 EP0355881 B1 EP 0355881B1
Authority
EP
European Patent Office
Prior art keywords
water
tap
inner tank
heating
compartment
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.)
Revoked
Application number
EP89201863A
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English (en)
French (fr)
Other versions
EP0355881A1 (de
Inventor
Joop Dekker
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.)
Nv Meppeler Machinefabriek
Original Assignee
Nv Meppeler Machinefabriek
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
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Application filed by Nv Meppeler Machinefabriek filed Critical Nv Meppeler Machinefabriek
Publication of EP0355881A1 publication Critical patent/EP0355881A1/de
Application granted granted Critical
Publication of EP0355881B1 publication Critical patent/EP0355881B1/de
Anticipated expiration legal-status Critical
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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
    • F24D3/087—Tap water heat exchangers specially adapted therefore
    • 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
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/08—Storage tanks

Definitions

  • the invention relates to a device as decribed in the pre-characterizing portion of claim 1.
  • a device is known from EP-A-0 178 351.
  • the heating water coming from the central heating boiler is carried through the tap-water heat exchanger, where incoming cold mains water is heated to hot tap-water.
  • the hot water reservoir is provided and connected in the flow direction before the heat exchanger, so that when hot tap-water is required, the incoming cold mains water can be heated immediately by means of the hot water present in the hot water reservoir.
  • This system does supply hot water at the desired temperature very rapidly.
  • the cold boiler water which entered initially and which is only partially mixed with later supplied hot water will come into contact with the actual heat exchanging coil, so that the hot tap-water, after initially having had the desired temperature, suddenly falls slightly in temperature, to then again definitively reach the desired high temperature shortly afterward.
  • Such temperature behaviour whereby some time after the hot water tap has been turned on a "dip" occurs in the temperature of the water, is extremely undesirable, especially in the case the hot water is being used to have a shower.
  • the invention therefore has for its object to provide a device of the type described in the preamble which does not have the above named drawback and which is able to supply tap-water that is rapidly at the desired temperature, even when the central heating boiler is not at operational temperature at the moment hot water is required, and that afterward retains this temperature.
  • this object is achieved with the device according to the invention as characterized in claim 1.
  • the hot water tap When the hot water tap is opened the water is at first still cold.
  • hot water is carried from the hot water reservoir via the return pipe to the central heating boiler.
  • the latter is immediately heated up by the hot water from the hot water reservoir, so that it very rapidly begins to supply hot heating water and therefore also rapidly begins to heat up the cold mains water in the tap-water heat exchanger. It has been found that with a normal central heating installation and with a hot water reservoir of a capacity of 10 litres, the tap-water reaches the required temperature within half a minute.
  • the accumulated heat in the hot water reservoir is not used for directly heating the tap-water but for bringing the device quickly to operating temperature.
  • a device for heating tap-water in a central heating device having a tap-water heat exchanger arranged in a hot water reservoir.
  • hot tap-water When hot tap-water is required, at first cold mains water is heated in the tap-water heat exchanger by the hot water in the reservoir.
  • the central heating boiler When the temperature of the water in the reservoir is fallen below a certain level, the central heating boiler is activated. Water from the reservoir is fed to the boiler and water from the boiler is returned to the reservoir and comes directly into contact with the tap water heat exchanger. At first the water from the boiler still has a lower temperature than the normal operating temperature so that the temperature of the tap-water falls. So also with this known device a "dip" occurs in the temperature of the water.
  • a tap-water heat exchanger consisting of an outer tank, an inner tank arranged therein and having one closed end wall and a tap coil arranged around the inner tank is per se known from the above-mentioned European patent specification 0.178.351. As already described the function of this unit differs from that according to the invention.
  • the heating water supply hereby runs out into the inner tank, while the heating water outlet debouches outside the inner tank.
  • Fig. 1 shows schematically a device according to a first embodiment of the invention.
  • Fig. 2 shows a diagram of a preferred embodiment of the invention corresponding with fig. 1.
  • Fig. 3 shows a partially broken away and partially sectional tap-water heat exchanger and hot water reservoir combined into one unit according to the preferred embodiment of the invention.
  • the device 1 in fig. 1 is a combined central heating device and tap-water heating device.
  • the heat source is a central heating boiler 2 which comprises a burner 3 and a heat exchanger 4 in which heating water from a return pipe 5 is heated and after heating is carried away via an outlet heating water pipe 6.
  • the central heating boiler 2 is provided with a control device 7 which controls the burner 3 and has as entrance quantity in the case shown the temperature of the heating water in the heating water pipe 6 and the temperature of the heating water in a tap-water heat exchanger 11.
  • a circulation pump 8 Arranged in the return pipe 5 is a circulation pump 8.
  • radiators and/or convectors 9 are connected between the heating water pipe 6 and the return pipe 5. These generate heat from the heating water in the space in which they are disposed.
  • a tap-water heat exchanger 11 is arranged between the heating water pipe 6 and the return pipe 5.
  • a three-way valve 10 mounted for this purpose in the heating water pipe 6 is a three-way valve 10, which can carry the heating water at choice to the tap-water heat exchanger 11 or to the radiators 9.
  • a tap-water coil 12 Arranged in the tap-water heat exchanger 11 is a tap-water coil 12 through which water from the mains water supply 13 can flow.
  • the feed connection of the tap coil 12 is connected to this mains water supply via respectively a main cock 14, a non return valve 15 and an adjusting tap 16.
  • the hot water from the tap coil 12 can be discharged directly via the connection 18.
  • the hot water connection of the tap coil 12 is likewise connected to a control valve 17, which is connected at a second inlet to the mains water supply 13, and which can deliver hot water at a controlled temperature via connection 19.
  • the central heating boiler 2 is at operating temperature, that is, usually during the winter period, as soon as hot tap-water is required, for instance through opening of a draw-off tap in the connecting pipe 18 or 19, the three-way valve 10 is switched over in order to send hot water from the pipe 6 to the tap-water heat exchanger 11. Hot water can then be drawn immediately from the connection 18 or 19.
  • a hot water reservoir 20 is arranged between the tap-water heat exchanger 11 and the return pipe 5.
  • This hot water reservoir 20 is filled with hot heating water.
  • the central heating boiler 2 and the circulation pump 8 are switched on, this hot water comes out of the hot water reservoir 20 via the return pipe 5 into the central heating boiler 2, which results in it being rapidly heated and moreover in the temperature of the water in the outlet pipe 6 increasing rapidly.
  • the hot water from the pipe 6 flows to the tap-water heat exchanger 11 and can thus heat the tap-water rapidly.
  • An important aspect of the invention is therefore that a quantity of hot water is stored in the hot water reservoir 20 and is used to bring the installation quickly up to operating temperature, this instead of the usual practice of generating heat directly to the water in the water pipe.
  • the installation and the tap-water thus reach the operating temperature rapidly, and this operating temperature, particularly of the tap-water, remains high for unlimited time afterward.
  • Fig. 2 shows a device 25 which largely corresponds with the device 1 in fig. 1.
  • the tap-water heat exchanger 11 and the hot water reservoir 20 shown in fig. 1 are combined in the device 25 into a heat exchanger unit 26.
  • the other elements of the device are designated with the same reference numerals as in fig. 1 and do not require further description.
  • the heat exchanger unit 26 comprises a closed outer tank 27 in which is arranged an inner tank 28 with one closed end wall 29.
  • a helically wound tube forming the tap coil 32 is arranged around the inner tank 28. The ends of the tap coil 32 are guided in sealed manner through the wall of the outer tank 27.
  • the heating water outlet 31 is located in the inner tank 28 and the heating water feed 30 outside this inner tank.
  • the hot water present in the inner tank 28 flows via the outlet 31 to the return pipe 5 and the central heating boiler 2 to heat up the latter.
  • the water from the pipe 6, at this moment cold flows via the feed 30 into the space between the outer tank 26 and the inner tank 28, along the tap coil 32.
  • FIG. 3 shows a further developed embodiment of the heat exchanger unit in which this disadvantageous effect is minimalised.
  • This heat exchanger unit 35 comprises in the manner already described an outer tank 36 assembled from a tubular wall closed off with end covers 37 and 38, in which is arranged an inner tank 39 likewise comprising a cylindrical wall, which however is only closed off at one end, in fig. 3 the upper end, with an end wall 40.
  • the lower end of the inner tank 39 is entirely open. Close to the closed end wall 40 the feed 41 runs into the outer tank 36, and the outlet 42 into the inner tank 39.
  • This outlet 42 leads through the end cover 38 to a connection 43 with the return pipe, onto which also runs out a connection 44 which is connected to the outlet of the radiators.
  • the diameter of the inner tank 39 is such that the space between the inner tank 39 and the outer tank 36 has a breadth substantially equal to the diameter of the tube of the tap coil 45.
  • the helically wound tube of the tap coil 45 therefore lies substantially against both the outer wall of the inner tank 39 and the inner wall of the outer tank 36.
  • a similarly helical space 46 is thus separated off between the successive windings, through which space the heating water from the feed 41 is constrained to flow.
  • the heat exchanger unit 35 according to the invention shown in fig. 3 has on the one hand the advantage that the effective quantity of hot water it can contain is maximal while on the other a very good heat transfer results from the hot water supplied via the feed 41 to the water in the tap coil 45, so that a pure counterflow heat exchange takes place.
  • the hot water leaving the tap coil 45 at the upper side therefore has practically the same temperature as the heating water supplied via the feed 41, so that with this embodiment the heating speed is optimal.
  • the heat exchanger unit according to the invention can be applied in both lying and standing position. In the latter case the closed end wall of the inner tank can be situated at the top or at the bottom. Because when the central heating boiler 2 and the circulation pump 8 are switched on the contents of the unit 45 are renewed very rapidly, the effects of the force of gravity on the mixing of the supplied cold water and the hot water present in the inner tank are relatively insignificant. It has been found that a capacity for the unit of approximately 10 litres is optimal for a domestic central heating installation.

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-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Claims (5)

  1. Vorrichtung zum Aufheizen von Leitungswasser in einer zentralen Heizungsanlage, die aufweist: einen zentralen Heizboiler (2) mit einer Heizwasser-Ausgangsleitung (6) und einer Rückführ-Eingangsleitung (5), Radiator- und/oder Konvektor-Heizkörper (9), eine Einrichtung, die im wesentlichen eine erste Kammer (11) mit einem Leitungswasser-Wärmetauscher (12) und eine als Heißwasserreservoir ausgebildete zweite Kammer (20) aufweist, wobei die erste und die zweite Kammer (11, 12) jeweils in Reihe geschaltete Heizwasser-Ein-und Auslässe aufweisen und zwischen diesen Leitungen angeordnet sind, und eine Umwälzpumpe (8), die in einer dieser Leitungen angeordnet ist, dadurch gekennzeichnet, daß die Heizwasser-Ausgangsleitung (6) mit dem Einlaß der ersten Kammer (11) verbunden ist, der Auslaß der ersten Kammer (11) mit dem Einlaß der zweiten Kammer (20) verbunden ist und der Auslaß der zweiten Kammer (20) mit der Rückführleitung (5) verbunden ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die ersten und zweiten Kammern der Einrichtung (11, 12, 20) zu einer Einheit integriert sind.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Einheit (35) im wesentlichen aufweist: einen Außentank (36) mit geschlossenen Stirnwänden (37, 38), einen darin angeordneten Innentank (39), dessen eine Stirnwand (40) geschlossen ist, ein wendelartig rund um den Innentank (39) angeordnetes Rohr (45), das eine Leitungswendel bildet und dessen Enden abgedichtet durch die Wandung des Außentanks (36) geführt sind, wobei, nahe der geschlossenen Stirnwand des Innentanks (39), ein zum Boiler führender Heizwasser-Rückführauslaß (31) innerhalb des Innentanks angeordnet ist und ein vom Boiler kommender Heizwasser-Zuführauslaß (30) außerhalb des Innentanks mündet, so daß die zweite Kammer durch den Bereich innerhalb des Innentanks und die erste Kammer durch den zwischen dem Außentank und dem Innentank liegenden Bereich festgelegt ist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Seitenwände des Außentanks und des Innentanks zylindrisch und koaxial sind und einen Zwischenraum haben, der im wesentlichen der Dicke des wendelartig gewundenen Rohrs (45) entspricht, so daß das Rohr im wesentlichen gegen den Innentank (39) und den Außentank (36) anliegt.
  5. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Heißwasserreservoir oder der Außentank eine Kapazität von weniger als 10 Litern hat.
EP89201863A 1988-07-27 1989-07-13 Brauchwassererhitzer Revoked EP0355881B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8801891 1988-07-27
NL8801891A NL194651C (nl) 1988-07-27 1988-07-27 Tapwater-verwarmingsinrichting.

Publications (2)

Publication Number Publication Date
EP0355881A1 EP0355881A1 (de) 1990-02-28
EP0355881B1 true EP0355881B1 (de) 1993-11-10

Family

ID=19852680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89201863A Revoked EP0355881B1 (de) 1988-07-27 1989-07-13 Brauchwassererhitzer

Country Status (3)

Country Link
EP (1) EP0355881B1 (de)
DE (1) DE68910611T2 (de)
NL (1) NL194651C (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254407B (en) * 1991-04-06 1994-09-07 Gledhill Water Storage Improvements relating to water heating apparatus
AT398128B (de) * 1992-09-24 1994-09-26 Vaillant Gmbh Umlauf-wasserheizer
DE19628773A1 (de) * 1996-07-17 1998-01-22 Kme Schmoele Gmbh Wärmetauscher zur Brauchwasserbereitung
IT243828Y1 (it) 1998-03-06 2002-03-06 Deltacalor S R L Unita' termosifone-termoconvettore
EP1028293B1 (de) * 1999-02-12 2002-08-07 Giorgio Scanferla Wärmetausch- und Speichereinheit für Wasserheizer, Verfahren zu deren Herstellung und Wasserheizer mit so einer Einheit
FR2847972B1 (fr) * 2002-11-29 2005-03-04 Realisation Mecaniques Engenee Echangeur de chaleur et dispositif de production d'eau chaude sanitaire

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1751291A1 (de) * 1968-05-03 1971-06-24 Gallometer Messgeraete Vertrie Waermeaustauscher
FR2557685B1 (fr) * 1983-12-30 1988-11-25 Lemer Joseph Rechauffeur d'eau sanitaire pour chaudiere a fluide caloporteur
EP0178351B1 (de) * 1984-10-15 1988-05-04 Plaatverwerkende Industrie van Wijk en Boerma B.V. Wassererhitzer z.B. Verbrauchswarmwasserbereiter

Also Published As

Publication number Publication date
NL194651C (nl) 2002-10-04
DE68910611D1 (de) 1993-12-16
NL8801891A (nl) 1990-02-16
EP0355881A1 (de) 1990-02-28
DE68910611T2 (de) 1994-03-31
NL194651B (nl) 2002-06-03

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