EP0421312B1 - Device for controlling the operation of the flow heater reservoir by tapping of domestic hot water. - Google Patents

Device for controlling the operation of the flow heater reservoir by tapping of domestic hot water. Download PDF

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Publication number
EP0421312B1
EP0421312B1 EP90118771A EP90118771A EP0421312B1 EP 0421312 B1 EP0421312 B1 EP 0421312B1 EP 90118771 A EP90118771 A EP 90118771A EP 90118771 A EP90118771 A EP 90118771A EP 0421312 B1 EP0421312 B1 EP 0421312B1
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EP
European Patent Office
Prior art keywords
accumulator
water
flow
valve
cold water
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EP90118771A
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German (de)
French (fr)
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EP0421312A2 (en
EP0421312A3 (en
Inventor
Joachim Berg
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N.V. VAILLANT S.A.
Vaillant Austria GmbH
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
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Publication of EP0421312A2 publication Critical patent/EP0421312A2/en
Publication of EP0421312A3 publication Critical patent/EP0421312A3/en
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    • 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
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
    • F24D19/1069—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water regulation in function of the temperature of the domestic hot water

Definitions

  • the present invention relates to a device for controlling the flow storage operation in a flow storage that can be heated by a heat source for a combination water heater with process water treatment and space heating, in particular for a gas wall heater, with a store with a secondary heat exchanger, by means of which the process water is heated by the heating water and an additional storage tank, the storage tank and the additional storage tank being connected in parallel via a hot water connection line and a cold water connection line, with a tap fitting with water switch and with a three-way valve for switching heating and domestic water operation via a control unit.
  • Start-up operation that starts with the minimum draw-off quantity at the start of the tap and when the full heat exchanger capacity is reached ends, the continuous operation, which follows the thermal start-up and guarantees an unlimited water withdrawal and the reloading operation, which keeps the storage content within the specified limits thermally ready to compensate for the missing heat exchanger output at the start of the tap.
  • a secondary heat exchanger for domestic water heating, in which the domestic water is heated by heating water.
  • the electrical three-way valve is actuated by a water switch and the heating water is directed through the secondary heat exchanger.
  • a sufficiently large storage space with hot water at a sufficiently high temperature must be available.
  • Such a memory which is heated via a heating water / process water heat exchanger connected in parallel, has become known, for example, from DE-OS 2201 628.
  • large storage tanks are not particularly advantageous in terms of both construction and heating technology.
  • a flow heater acted upon by the boiler water and a process water storage container are in relation to one another connected in parallel.
  • a circulation control is provided in the hot water connection line between the instantaneous water heater and the storage container to heat the storage container.
  • the process water is withdrawn in certain proportions both from the instantaneous water heater and from the storage tank.
  • This combination makes it possible to withdraw a large amount of water per unit of time at a relatively high outlet temperature during continuous operation.
  • the disadvantage here is that the withdrawal from the instantaneous water heater dominates at the start of the tap, so that the process water at the desired temperature is only available after a start-up phase.
  • This system also requires a relatively large storage container.
  • the present invention is based on the object of specifying a device by means of which hot water can be made available in combination devices, which manages with a minimum of storage space, sensors and actuators, which is characterized by rapid availability, a high outlet temperature constancy and an unlimited withdrawal quantity.
  • a three-way reversing valve in the cold water connection line, which is the water switch in the cold water line is connected downstream and the three-way reversing valve is provided with a valve drive which can be controlled electrically and / or thermally such that when the three-way reversing valve is at rest, the flow direction from the cold water line to the additional reservoir is released, and the flow flow continuously when the tap operation begins to the additional storage is reduced while the flow flow to the storage is increased, the sum of the partial flows to the storage and to the additional storage being constant, the flow direction from the cold water line to the storage is fully released when in the continuous mode and when the three-way reversing valve is in the reload mode the flow direction of the cold water connecting line between the storage and the additional storage is released and, if necessary, the flow direction is blocked by the cold water line.
  • valve drive is connected to a timing element, which the continuous reversal of the part flows during the start of the tap after a defined initial delay, which is dependent on the respective device data, such as storage capacity, heating capacity and the like.
  • the drawing shows schematically an embodiment of a combination water heater.
  • the combination water heater has a primary heat exchanger 2 heated by a burner 1, which is connected to a return line 4 provided with a circulation pump 3 and a flow line 5, the latter having a flow temperature sensor 6 which is connected to a measuring line 7 , which leads to an input of a control unit 8.
  • a return line 4 there is also a three-way valve 9 which can be actuated by a motor drive 10.
  • the motor drive 10 of the three-way valve 9 draws its actuating energy from the control unit 8 via a line 11. of radiators, and the heat exchanger return line 13, which returns from a secondary heat exchanger 17 in the memory 14 to the water heater.
  • the flow line 5 is divided into a T-piece in the heating flow line 15 and the heat exchanger flow line 16, which leads to the heat exchanger 17 in the flow storage 14.
  • the burner 1 is supplied with gas via a gas line 27, via a gas valve 28, which is controlled by a magnetic drive 29, and via a gas control device.
  • the magnetic drive 29 is through a line 31, a burner blower 30 through a line 32 with the Control unit 8 connected.
  • the burner 1 is still not shown Devices such as ignition device, flame detection device, etc. assigned.
  • the secondary heat exchanger 17 for example in the form of a smooth coil of copper pipes, is arranged in the store 14, which is designed as a service water store with appropriate insulation.
  • Baffles 18 for flow guidance are fastened coaxially in the smooth tube coil.
  • the connection for the cold water supply is provided in the lower area of the memory 14.
  • a further store 19 is arranged.
  • a temperature sensor 34 of this memory 19 is connected to the control unit 8 via a line 35.
  • the two reservoirs 14 and 19 are connected to one another in their upper region by a hot water connecting line 33 and in their lower region by a cold water connecting line 36 and are thus connected in parallel between the cold water line 25 and the hot water line 24.
  • the hot water line 24 is connected directly to the hot water connection line 33, whereas the cold water line 25 is connected to the cold water connection line 36 via a three-way reversing valve 37.
  • the reversing valve 37 can be actuated by a valve drive 38 controlled electrically and / or thermally via a line 39.
  • tap operation ie when hot water is drawn from the tap 24 via a tap fitting, cold water flows through the cold water pipe 25 via the water switch 21. Due to the pressure difference, the microswitch 23 of the water switch 21 triggers the hot water operation by signals via the line 40 to the control unit 8.
  • the dimensioning of the two stores 14 and 19 depends above all on the maximum possible draw-off quantity, on the start-up time on the heating side and on the characteristics of the three-way reversing valve 37.
  • the hot water priority mode is triggered via the microswitch 23 of the water switch 21.
  • the three-way valve 9 is reversed by the control unit 8 from the motor 10 to the charging circuit.
  • the burner blower 30 is actuated via the control unit 8 and, after the flushing time has elapsed, the gas valve 28 and the ignition device are actuated and the burner 1 starts up.
  • the reversing valve 37 downstream of the water switch 21 is at the start of the tap in the flow direction on the memory 19, so that the full tap throughput initially flows through the memory 19 to the tap.
  • valve drive 38 controls the flow direction continuously and within a predetermined time to the memory 14 with the secondary heat exchanger 17.
  • the flow resistances within the cable routing are adjusted so that the sum of the partial flows remains the same.
  • the valve drive 38 of the reversing valve 37 can be implemented both electrically, for example by means of a motor or an electrically heated expansion body, and thermally, for example by means of a liquid sensor, expansion body or the like, or from a combination of the two.
  • a storage space 22 which, like the space in the storage 19, serves to bridge the power deficit at the start of the tap. In addition, it performs the function of a damper in continuous operation, which reduces the temperature fluctuations of the hot water which are inevitable when the burner 1 is operated in cycles, to an acceptable level.
  • the store 19 is first reloaded.
  • the reloading operation is triggered and ended by the temperature controller 34 in the store 19.
  • the reversing valve 37 is in a central position, so that the stores 14 and 19 are connected via the cold water connecting line 36. Since the stores 14 and 19 are permanently connected in their upper region via the hot water connection line 33, a circulation flow sets in due to the density differences of the respective water contents, which allows the hot water heated in the store 14 to flow into the additional store 19 and the cooler water of the Memory 19 feeds the memory 14 from below.
  • the valve 37 switches back to the initial rest position. The heater operates the heating again or goes into standby in summer mode.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Massaging Devices (AREA)
  • Selective Calling Equipment (AREA)
  • Centrifugal Separators (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Abstract

Method of and device for controlling the continuous flow storage working during tapping of domestic hot water on a wall heating device with domestic hot-water preparation and room heating, with a secondary heat exchanger (17), by means of which the domestic water is heated by the heating water, with a tapping fitting (20) with water switch (21) and with a three-way valve (9) for switching over from heating to domestic water operation via a control unit (8). The continuous flow accumulator consists of an accumulator (14) with the secondary heat exchanger (17) and an additional accumulator (19), these accumulators (14, 19) being connected parallel via a hot water connecting pipe (33) and via a cold water connecting pipe (36). Moreover, there is arranged in the cold water connecting pipe (36) a three-way reverse valve (37) which is connected downstream of the water switch (21) in the cold water pipe (25). The three-way reverse valve (37) is provided with a valve drive (38) which can be controlled electrically or thermally.

Description

Die vorliegende Erfindung bezieht sich auf eine Vorrichtung zum Steuern des Durchlaufspeicherbetriebes bei einem von einer Wärmequelle beheizbaren Durchlaufspeicher für einen Kombi-Wasserheizer mit Brauchwasseraufbereitung und Raumheizung, insbesondere für ein Gaswandheizgerät, mit einem Speicher mit Sekundär-Wärmetauscher, durch den das Brauchwasser vom Heizwasser erwärmt wird und einem Zusatzspeicher, wobei der Speicher und der Zusatzspeicher über eine Warmwasser-Verbindungsleitung und über eine Kaltwasser-Verbindungsleitung parallelgeschaltet sind, mit einer Zapfarmatur mit Wasserschalter sowie mit einem Drei-Wege-Ventil für das Umschalten von Heiz- und Brauchwasserbetrieb über eine Regeleinheit.The present invention relates to a device for controlling the flow storage operation in a flow storage that can be heated by a heat source for a combination water heater with process water treatment and space heating, in particular for a gas wall heater, with a store with a secondary heat exchanger, by means of which the process water is heated by the heating water and an additional storage tank, the storage tank and the additional storage tank being connected in parallel via a hot water connection line and a cold water connection line, with a tap fitting with water switch and with a three-way valve for switching heating and domestic water operation via a control unit.

Bei derartigen Anlagen mit Durchlaufspeichern kann man drei Betriebsphasen unterscheiden:A distinction can be made between three operating phases in such systems with continuous storage:

Den Anlaufbetrieb, der bei Zapfbeginn mit der Mindestzapfmenge startet und mit Erreichen der vollen Wärmetauscherleistung endet, den Durchlaufbetrieb, der sich dem thermischen Anlauf anschließt und eine zeitlich unbegrenzte Wasserentnahme gewährleistet und den Nachladebetrieb, der den Speicherinhalt innerhalb vorgegebener Schranken thermisch in Bereitschaft hält, um bei Zapfbeginn die noch fehlende Leistung des Wärmetauschers auszugleichen.Start-up operation that starts with the minimum draw-off quantity at the start of the tap and when the full heat exchanger capacity is reached ends, the continuous operation, which follows the thermal start-up and guarantees an unlimited water withdrawal and the reloading operation, which keeps the storage content within the specified limits thermally ready to compensate for the missing heat exchanger output at the start of the tap.

Bei diesen Geräten ist für die Brauchwassererwärmung ein Sekundär-Wärmetauscher vorgesehen, in dem das Brauchwasser durch Heizwasser erwärmt wird. Beim Zapfen von Brauchwasser wird durch einen Wasserschalter das elektrische Drei-Wege-Ventil betätigt und das Heizwasser über den Sekundärwärmetauscher geleitet. Zur Überbrückung des Leistungsdefizites bei Zapfbeginn während des thermischen Anlaufs muß ein ausreichend großer Speicherraum mit Brauchwasser von ausreichend hoher Temperatur zur Verfügung stehen. Ein solcher Speicher, der über einen parallelgeschalteten Heizwasser-/ Brauchwasser-Wärmetauscher aufgeheizt wird, ist beispielsweise aus der DE-OS 2201 628 bekanntgeworden. Große Speicher sind jedoch sowohl bau- als auch heizungstechnisch nicht besonders vorteilhaft.In these devices, a secondary heat exchanger is provided for domestic water heating, in which the domestic water is heated by heating water. When drawing hot water, the electrical three-way valve is actuated by a water switch and the heating water is directed through the secondary heat exchanger. To bridge the performance deficit at the start of the tap during the thermal start-up, a sufficiently large storage space with hot water at a sufficiently high temperature must be available. Such a memory, which is heated via a heating water / process water heat exchanger connected in parallel, has become known, for example, from DE-OS 2201 628. However, large storage tanks are not particularly advantageous in terms of both construction and heating technology.

Bei einem in der DE-OS 17 58 298 beschriebenen Haushalts-Warmwasserbereiter sind ein vom Kesselwasser beaufschlagter Durchlauferhitzer und ein Brauchwasser-Vorratsbehälter zueinander parallel geschaltet. Zur Aufheizung des Vorratsbehälters ist eine Zirkulationssteuerung in der Warmwasser-Verbindungsleitung zwischen dem Durchlauferhitzer und dem Vorratsbehälter vorgesehen. Die Brauchwasserentnahme erfolgt in Abhängigkeit von der Entnahmemenge in bestimmten Anteilen sowohl aus dem Durchlauferhitzer als auch aus dem Vorratsbehälter. Durch diese Kombination ist bei Dauerbetrieb die Entnahme einer großen Wassermenge pro Zeiteinheit bei relativ hoher Auslauftemperatur möglich. Nachteilig dabei ist, daß bei Zapfbeginn die Entnahme aus dem Durchlauferhitzer dominiert, so daß wunschgemäß temperiertes Brauchwasser erst nach einer Anlaufphase zur Verfügung steht. Außerdem ist auch bei diesem System ein relativ großer Vorratsbehälter erforderlich.In a household water heater described in DE-OS 17 58 298, a flow heater acted upon by the boiler water and a process water storage container are in relation to one another connected in parallel. A circulation control is provided in the hot water connection line between the instantaneous water heater and the storage container to heat the storage container. Depending on the amount withdrawn, the process water is withdrawn in certain proportions both from the instantaneous water heater and from the storage tank. This combination makes it possible to withdraw a large amount of water per unit of time at a relatively high outlet temperature during continuous operation. The disadvantage here is that the withdrawal from the instantaneous water heater dominates at the start of the tap, so that the process water at the desired temperature is only available after a start-up phase. This system also requires a relatively large storage container.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung anzugeben, durch welche eine Brauchwasserbereitstellung bei Kombigeräten möglich ist, die mit einem Minimum an Speicherraum, Sensorik und Aktorik auskommt, die sich durch eine schnelle Verfügbarkeit, eine hohe Auslauftemperaturkonstanz und eine unbegrenzte Entnahmemenge auszeichnet.The present invention is based on the object of specifying a device by means of which hot water can be made available in combination devices, which manages with a minimum of storage space, sensors and actuators, which is characterized by rapid availability, a high outlet temperature constancy and an unlimited withdrawal quantity.

Die Lösung dieser Aufgabe gelingt, indem in der Kaltwasser-Verbindungsleitung ein Drei-Wege-Umsteuerventil angeordnet ist, welches dem Wasserschalter in der Kaltwasserleitung nachgeschaltet ist und das Drei-Wege-Umsteuerventil mit einem Ventilantrieb versehen ist, der elektrisch und/oder thermisch derart steuerbar ist, daß bei Ruhestellung des Drei-Wege-Umsteuerventiles die Flußrichtung von der Kaltwasserleitung zum Zusatzspeicher freigegeben ist, bei beginnendem Zapfbetrieb kontinuierlich der Strömungsdurchfluß zum Zusatzspeicher vermindert wird, während der Strömungsdurchfluß zum Speicher erhöht wird, wobei die Summe der Teilströme zum Speicher und zum Zusatzspeicher konstant, bei Stellung im Durchlaufbetrieb die Flußrichtung von der Kaltwasserleitung zum Speicher voll freigegeben ist und bei Stellung des Drei-Wege-Umsteuerventiles im Nachladebetrieb die Flußrichtung der Kaltwasser-Verbindungsleitung zwischen dem Speicher und dem Zusatzspeicher freigegeben und gegebenenfalls die Flußrichtung von der Kaltwasserleitung gesperrt ist.This problem is solved by arranging a three-way reversing valve in the cold water connection line, which is the water switch in the cold water line is connected downstream and the three-way reversing valve is provided with a valve drive which can be controlled electrically and / or thermally such that when the three-way reversing valve is at rest, the flow direction from the cold water line to the additional reservoir is released, and the flow flow continuously when the tap operation begins to the additional storage is reduced while the flow flow to the storage is increased, the sum of the partial flows to the storage and to the additional storage being constant, the flow direction from the cold water line to the storage is fully released when in the continuous mode and when the three-way reversing valve is in the reload mode the flow direction of the cold water connecting line between the storage and the additional storage is released and, if necessary, the flow direction is blocked by the cold water line.

Durch diese Maßnahme wird trotz relativ kleiner Speicherbereiche von Zapfbeginn an eine im wesentlichen konstante Brauchwassertemperatur erzielt, welche auch über eine längere Zapfdauer problemlos aufrechterhalten werden kann.In spite of the relatively small storage areas, this measure achieves an essentially constant hot water temperature from the start of the tap, which can also be maintained without problems over a longer tap period.

Um der Trägheit während der Anlaufphase besser gerecht zu werden, ist gemäß einer weiteren Ausgestaltung der Erfindung vorgesehen, daß der Ventilantrieb mit einem Zeitglied verbunden ist, welches das kontinuierliche Umsteuern der Teil ströme während des Zapfbeginns nach einer definierten Anfangsverzögerung, die von den jeweiligen Gerätedaten, wie Speicherkapazität, Heizvermögen und dergleichen abhängig ist, einleitet.In order to do better justice to the inertia during the start-up phase, it is provided according to a further embodiment of the invention that the valve drive is connected to a timing element, which the continuous reversal of the part flows during the start of the tap after a defined initial delay, which is dependent on the respective device data, such as storage capacity, heating capacity and the like.

Weitere Einzelheiten, Merkmale und Vorteile der Erfindung werden anhand der nachfolgenden Beschreibung unter Bezugnahme auf die Zeichnung näher erläutert. Die Zeichnung zeigt schematisch eine Ausführungsform eines Kombi-Wasserheizers.Further details, features and advantages of the invention are explained in more detail with reference to the following description with reference to the drawing. The drawing shows schematically an embodiment of a combination water heater.

Der Kombi-Wasserheizer weist einen von einem Brenner 1 beheizten Primär-Wärmetauscher 2 auf, der an eine mit einer Umwälzpumpe 3 versehene Rücklaufleitung 4 und eine Vorlaufleitung 5 angeschlossen ist, wobei letztere einen Vorlauf-Temperaturfühler 6 aufweist, der an eine Meßleitung 7 angeschlossen ist, die zu einem Eingang einer Regeleinheit 8 führt. In der Rücklaufleitung 4 ist weiters ein Dreiwege-Ventil 9 angeordnet, welches über einen Motorantrieb 10 betätigbar ist. Der Motorantrieb 10 des Dreiwege-Ventiles 9 bezieht seine Stellenergie über eine Leitung 11 von der Regeleinheit 8. Im Dreiwege-Ventil 9 münden die Heizwasser-Rücklaufleitung 12, die von einem nicht dargestellten Heizungssystem, z.B. von Heizkörpern, kommt und die Wärmetauscher-Rücklaufleitung 13, welche von einem Sekundär-Wärmetauscher 17 im Speicher 14 zum Wasserheizer zurückführt. Die Vorlaufleitung 5 teilt sich in einem T-Stück in die Heizungsvorlaufleitung 15 und die Wärmetauscher-Vorlaufleitung 16, die in den Durchlaufspeicher 14 zum Wärmetauscher 17 führt, auf.The combination water heater has a primary heat exchanger 2 heated by a burner 1, which is connected to a return line 4 provided with a circulation pump 3 and a flow line 5, the latter having a flow temperature sensor 6 which is connected to a measuring line 7 , which leads to an input of a control unit 8. In the return line 4 there is also a three-way valve 9 which can be actuated by a motor drive 10. The motor drive 10 of the three-way valve 9 draws its actuating energy from the control unit 8 via a line 11. of radiators, and the heat exchanger return line 13, which returns from a secondary heat exchanger 17 in the memory 14 to the water heater. The flow line 5 is divided into a T-piece in the heating flow line 15 and the heat exchanger flow line 16, which leads to the heat exchanger 17 in the flow storage 14.

Der Brenner 1 wird über eine Gasleitung 27, über ein Gasventil 28, das durch einen Magnet antrieb 29 gesteuert wird, sowie über eine Gasregeleinrichtung mit Gas versorgt.Der Magnet antrieb 29 ist durch eine Stelleitung 31, ein Brennerglebläse 30 durch eine Leitung 32 mit der Regeleinheit 8 verbunden. Weiters sind dem Brenner 1 noch, nicht näher dargestellte Einrichtungen, wie Zündeinrichtung, Flammenmeldeeinrichtung usw., zugeordnet.The burner 1 is supplied with gas via a gas line 27, via a gas valve 28, which is controlled by a magnetic drive 29, and via a gas control device. The magnetic drive 29 is through a line 31, a burner blower 30 through a line 32 with the Control unit 8 connected. Furthermore, the burner 1 is still not shown Devices such as ignition device, flame detection device, etc. assigned.

Im Speicher 14, der als Brauchwasserspeicher mit entsprechender Isolation ausgebildet ist, ist der Sekundär-Wärmetauscher 17, beispielsweise in Form einer Glattrohrschlange aus Kupferrohren, angeordnet. Koaxial in der Glattrohrschlange sind Einbauten 18 zur Strömungsführung befestigt. Der Anschluß für die Kaltwasserzuleitung ist im unteren Bereich des Speichers 14 vorgesehen.The secondary heat exchanger 17, for example in the form of a smooth coil of copper pipes, is arranged in the store 14, which is designed as a service water store with appropriate insulation. Baffles 18 for flow guidance are fastened coaxially in the smooth tube coil. The connection for the cold water supply is provided in the lower area of the memory 14.

Neben dem Speicher 14 mit dem Sekundär-Wärmetauscher 17 ist ein weiterer Speicher 19 angeordnet. Ein Temperaturfühler 34 dieses Speichers 19 ist über eine Leitung 35 mit der Regeleinheit 8 verbunden. Die beiden Speicher 14 und 19 sind in ihrem oberen Bereich durch eine Warmwasser-Verbindungsleitung 33 und in ihrem unteren Bereich durch eine Kaltwasser-Verbindungsleitung 36 miteinander verbunden und so zwischen der Kaltwasserleitung 25 und der Brauchwasserleitung 24 parallelgeschaltet. Die Brauchwasserleitung 24 ist direkt an die Warmwasser-Verbindungsleitung 33 angeschlossen, wogegen die Kaltwasserleitung 25 über ein Dreiwege-Umsteuerventil 37 mit der Kaltwasser-Verbindungsleitung 36 verbunden ist. Das Umsteuerventil 37 ist durch einen elektrisch und/oder thermisch über eine Leitung 39 gesteuerten Ventilantrieb 38 betätigbar. In der Kaltwasserleitung 25 ist ein Wasserschalter 21 mit Temperaturwähler und Mikroschalter 23, welcher über eine Leitung 40 mit der Regeleinheit 8 verbunden ist, angeordnet. Bei Zapfbetrieb, d.h. wenn über eine Zapfarmatur der Brauchwasserleitung 24 Warmwasser entnommen wird, strömt Kaltwasser durch die Kaltwasserleitung 25 über den Wasserschalter 21 nach. Durch den Druckunterschied löst der Mikroschalter 23 des Wasserschalters 21 durch Signale über die Leitung 40 an die Regeleinheit 8 den Brauchwasserbetrieb aus.In addition to the store 14 with the secondary heat exchanger 17, a further store 19 is arranged. A temperature sensor 34 of this memory 19 is connected to the control unit 8 via a line 35. The two reservoirs 14 and 19 are connected to one another in their upper region by a hot water connecting line 33 and in their lower region by a cold water connecting line 36 and are thus connected in parallel between the cold water line 25 and the hot water line 24. The hot water line 24 is connected directly to the hot water connection line 33, whereas the cold water line 25 is connected to the cold water connection line 36 via a three-way reversing valve 37. The reversing valve 37 can be actuated by a valve drive 38 controlled electrically and / or thermally via a line 39. In the cold water line 25 is a water switch 21 with temperature selector and microswitch 23, which is connected to the control unit 8 via a line 40. In tap operation, ie when hot water is drawn from the tap 24 via a tap fitting, cold water flows through the cold water pipe 25 via the water switch 21. Due to the pressure difference, the microswitch 23 of the water switch 21 triggers the hot water operation by signals via the line 40 to the control unit 8.

Die Dimensionierung der beiden Speicher 14 und 19 hängt vor allem von der maximal möglichen Zapfmenge, von der Anlaufzeit auf der Beheizungsseite sowie von den Kennlinien des Dreiwege-Umsteuerventiles 37 ab.The dimensioning of the two stores 14 and 19 depends above all on the maximum possible draw-off quantity, on the start-up time on the heating side and on the characteristics of the three-way reversing valve 37.

Der Durchlaufspeicherbeitrieb mit den beiden parallelgeschalteten Speichern 14 und 19 funktioniert wie folgt:The continuous storage mode with the two memories 14 and 19 connected in parallel works as follows:

Bei einem Zapfbetrieb durch öffnen des Zapfventiles 20 und Überschreiten des Mindestzapfdurchsatzes wird über den Mikroschalter 23 des Wasserschalters 21 der Brauchwasservorrangbetrieb ausgelöst. Das Dreiwege-Ventil 9 wird über die Regeleinheit 8 vom Motor 10 auf den Ladekreis umgesteuert. Gleichzeitig wird über die Regeleinheit 8 das Brennergebläse 30 und nach Ablauf der Spülzeit das Gasventil 28 sowie die Zündeinrichtung angesteuert und der Brenner 1 geht in Betrieb. Das dem Wasserschalter 21 nachgeordnete Umsteuerventil 37 steht bei Zapfbeginn in Flußrichtung auf den Speicher 19 , sodaß der volle Zapfdurchsatz zunächst über den Speicher 19 zur Zapfstelle abfließt. Mit einer definierten Anfangsverzögerung durch ein Zeitglied in der Regeleinheit 8 steuert der Ventilantrieb 38 die Flußrichtung kontinuierlich und innerhalb einer vorgegebenen Zeit auf den Speicher 14 mit dem Sekundär-Wärmetauscher 17 um. Dabei sind die Strömungswiderstände innerhalb der Leitungsführung so abgestimmt, daß die Summe der Teilströme gleichbleibt. Der Ventilantrieb 38 des Umsteuerventiles 37 kann sowohl elektrisch, z.B. mittels Motor oder elekrisch beheiztem Dehnstoffkörper, als auch thermisch, beispielsweise durch Flüssigkeitsfühler, Dehnkörper oder dgl., oder aus einer Kombination von beiden realisiert sein.During a tap operation by opening the tap valve 20 and exceeding the minimum tap throughput, the hot water priority mode is triggered via the microswitch 23 of the water switch 21. The three-way valve 9 is reversed by the control unit 8 from the motor 10 to the charging circuit. At the same time, the burner blower 30 is actuated via the control unit 8 and, after the flushing time has elapsed, the gas valve 28 and the ignition device are actuated and the burner 1 starts up. The reversing valve 37 downstream of the water switch 21 is at the start of the tap in the flow direction on the memory 19, so that the full tap throughput initially flows through the memory 19 to the tap. With a defined initial delay by a timer in the control unit 8, the valve drive 38 controls the flow direction continuously and within a predetermined time to the memory 14 with the secondary heat exchanger 17. The flow resistances within the cable routing are adjusted so that the sum of the partial flows remains the same. The valve drive 38 of the reversing valve 37 can be implemented both electrically, for example by means of a motor or an electrically heated expansion body, and thermally, for example by means of a liquid sensor, expansion body or the like, or from a combination of the two.

Oberhalb des Wärmetauschers 17 im Speicher 14 ist noch ein Speicherraum 22 vorgesehen, der ebenso wie der Raum des Speichers 19 zur Überbrückung des Leistungsdefizits bei Zapfbeginn dient. Darüber hinaus nimmt er im Durchlaufbetrieb die Funktion eines Dämpfers wahr, der die bei taktend betriebenem Brenner 1 unvermeidlichen Temperaturschwingungen des Warmwassers auf ein akzeptables Maß verringert.Above the heat exchanger 17 in the storage 14 there is also a storage space 22 which, like the space in the storage 19, serves to bridge the power deficit at the start of the tap. In addition, it performs the function of a damper in continuous operation, which reduces the temperature fluctuations of the hot water which are inevitable when the burner 1 is operated in cycles, to an acceptable level.

Nach Beendigung des Zapfbetriebes erfolgt zunächst ein Nachladen des Speichers 19. Der Nachladebetrieb wird ausgelöst und beendet durch den Temperaturführler 34 im Speicher 19. Während des Nachladebetriebs befindet sich das Umsteuerventil 37 in einer Mittelstellung, sodaß die Speicher 14 und 19 über die Kaltwasser-Verbindungsleitung 36 verbunden sind. Da die Speicher 14 und 19 in ihrem oberen Bereich über die Warmwasser-Verbindungsleitung 33 permanent in Verbindung stehen, setzt aufgrund der Dichteunterschiede der jeweiligen Wasserinhalte eine Zirkulationsströmung ein, die das im Speicher 14 erwärmte Brauchwasser in den Zusatzspeicher 19 abfließen läßt und das kühlere Wasser des Speichers 19 dem Speicher 14 von unten zuführt. Mit Beendigung des Nachladevorganges steuert das Ventil 37 wieder in die anfängliche Ruheposition um. Das Heizgerät bedient wieder die Heizung oder geht im Sommerbetrieb in Bereitschaftsstellung.After the dispensing operation has ended, the store 19 is first reloaded. The reloading operation is triggered and ended by the temperature controller 34 in the store 19. During the reloading operation, the reversing valve 37 is in a central position, so that the stores 14 and 19 are connected via the cold water connecting line 36. Since the stores 14 and 19 are permanently connected in their upper region via the hot water connection line 33, a circulation flow sets in due to the density differences of the respective water contents, which allows the hot water heated in the store 14 to flow into the additional store 19 and the cooler water of the Memory 19 feeds the memory 14 from below. When the reloading process has ended, the valve 37 switches back to the initial rest position. The heater operates the heating again or goes into standby in summer mode.

Claims (2)

  1. An apparatus for controlling the flow-through accumulator operation in a flow-through accumulator, which is heatable by a heat source and used in a combined water heater for preparing hot tap water and for room heating, particularly in a wall-mounted gas-firing heating appliance, which heater comprises an accumulator having a secondary heat exchanger, in which the tap water is heated by the room-heating water, and an additional accumulator, wherein the accumulator and the additional accumulator are connected in parallel by a communicating hot water line and a communicating cold water line; and said apparatus comprises a tap fitting comprising a water switch, and a three-way valve for effecting a change over from room-heating operation to tap water-heating operation under the control of a controller, characterized in that a three-way change-over valve (37) is contained in the communicating cold water line (36) and succeeds the water switch (21) contained in the cold water line (25), the three-way change-over valve (37) is provided with a valve actuator (38), which is electrically and/or thermally controlled in such a manner that the three-way change-over valve (37) when it is in its initial position is open for a flow from the cold water line (25) to the additional accumulator (19), when the tapping has been initiated the flow area leading to the additional accumulator (19) is continuously decreased and the flow area leading to the accumulator (14) is increased, while the sum of the partial streams flowing to the accumulator (14) and to the additional accumulator (19) is constant, in the position for flow-through operation the valve is fully open for the flow from the cold water line (25) to the accumulator (14), in the position for the recharging operation the valve is open for the flow in the communicating cold water line (36) between the accumulator (14) and the additional accumulator (19) and optionally the flow from the cold water line 25 is shut off.
  2. An apparatus according to claim 1, characteried in that the valve actuator (38) is connected to a timer, which during the initiation of the tapping operation initiates the continuous change of the partial streams after a defined initial delay, which depends on the technical data of the appliance concerned, such as accumulator capacity, heating capacity and the like.
EP90118771A 1989-10-04 1990-09-29 Device for controlling the operation of the flow heater reservoir by tapping of domestic hot water. Expired - Lifetime EP0421312B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2295/89A AT393316B (en) 1989-10-04 1989-10-04 METHOD FOR CONTROLLING THE CONTINUOUS OPERATION IN THE WATER TAP ON A WALL HEATER AND DEVICE FOR IMPLEMENTING THE METHOD
AT2295/89 1989-10-04

Publications (3)

Publication Number Publication Date
EP0421312A2 EP0421312A2 (en) 1991-04-10
EP0421312A3 EP0421312A3 (en) 1991-09-04
EP0421312B1 true EP0421312B1 (en) 1993-09-29

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Application Number Title Priority Date Filing Date
EP90118771A Expired - Lifetime EP0421312B1 (en) 1989-10-04 1990-09-29 Device for controlling the operation of the flow heater reservoir by tapping of domestic hot water.

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EP (1) EP0421312B1 (en)
AT (2) AT393316B (en)
DE (2) DE4031187A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4142547C2 (en) * 1991-12-21 1993-11-25 Bosch Gmbh Robert Heater for space heating and domestic hot water preparation
DE4308941C2 (en) * 1993-03-19 2000-08-31 Harald Wolf Arrangement for the provision of hot water for flow storage heaters heated with gas wall devices
DE19751515C2 (en) † 1997-11-21 1999-12-02 Grundfos A S Bjerringbro Unit for a compact heating system
CN104633943B (en) * 2014-12-30 2019-03-26 广东自助者管道科技有限公司 A kind of gas heater pipe switch box mounting structure
CN105805941A (en) * 2016-05-23 2016-07-27 珠海格力电器股份有限公司 Wall-hanging stove
JP6745039B2 (en) * 2016-11-25 2020-08-26 株式会社ノーリツ Heating water heater
DE102018210071A1 (en) * 2018-06-21 2019-12-24 Robert Bosch Gmbh Heater and heating system with one heater

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1520519A (en) * 1967-02-09 1968-04-12 Fonderie Soc Gen De Sophisticated installation for the production of domestic hot water
EP0098450B1 (en) * 1982-07-02 1986-06-18 Joh. Vaillant GmbH u. Co. Fuel-fired heat source
DE3714968A1 (en) * 1986-05-03 1987-11-05 Vaillant Joh Gmbh & Co Hot-water supply system

Also Published As

Publication number Publication date
ATA229589A (en) 1991-02-15
AT393316B (en) 1991-09-25
ATE95294T1 (en) 1993-10-15
DE59002916D1 (en) 1993-11-04
DE4031187A1 (en) 1991-04-18
EP0421312A2 (en) 1991-04-10
EP0421312A3 (en) 1991-09-04

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