EP1619453A1 - Warm water heating installation with hydraulic protection circuit and method for operating the same. - Google Patents

Warm water heating installation with hydraulic protection circuit and method for operating the same. Download PDF

Info

Publication number
EP1619453A1
EP1619453A1 EP05104842A EP05104842A EP1619453A1 EP 1619453 A1 EP1619453 A1 EP 1619453A1 EP 05104842 A EP05104842 A EP 05104842A EP 05104842 A EP05104842 A EP 05104842A EP 1619453 A1 EP1619453 A1 EP 1619453A1
Authority
EP
European Patent Office
Prior art keywords
heating circuit
internal heating
hot water
heat exchanger
pressure
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.)
Granted
Application number
EP05104842A
Other languages
German (de)
French (fr)
Other versions
EP1619453B1 (en
Inventor
Wolfgang Volz
Uwe Clement
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
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1619453A1 publication Critical patent/EP1619453A1/en
Application granted granted Critical
Publication of EP1619453B1 publication Critical patent/EP1619453B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F24H1/48—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
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/12—Preventing or detecting fluid leakage
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/242—Pressure
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/305—Control of valves
    • F24H15/32—Control of valves of switching valves
    • 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
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/36—Control of heat-generating means in heaters of burners

Definitions

  • the invention relates to a hot water heating system with a hydraulic protection circuit and a method for operating the hydraulic protection circuit according to the preamble of the independent claims.
  • the known hot water heating systems use a water heater, in which a primary heat exchanger is provided for an internal heating circuit, which is connected to an external heating circuit, so that over the primary heat exchanger by means of a circulation pump a Walkerwasserniklauf is realized.
  • the internal heating circuit is also connected via a branch line with a secondary heat exchanger, which is connected to a hot water circuit.
  • the connection of the two circuits via a three-way switching valve. In a heat request of the hot water circuit from the switching valve, the flow through the external heating circuit is disabled and the heating water of the internal heating circuit is supplied via the branch line to the secondary heat exchanger.
  • the heating water circuits in hot water heating systems are closed circuits and are under an overpressure of up to 3 bar.
  • a water leak can occur if there is a defect in the hydraulic system of the water heater, which can potentially cause considerable water damage.
  • a large part of the contents of the heating water from the entire heating water circuit including the external heating circuit flows out until the overpressure is reduced.
  • a hydraulic protection circuit of a hot water tank, which is connected to a hot water network is known from US 4,607,615, wherein a valve arrangement is provided which separates the drinking water connection from the hot water tank in the event of a leak or a pipe rupture.
  • the object of the present invention is to detect a defect or a leak in the heating circuit of the water heater and to take measures to limit a water damage.
  • the object of the invention is achieved with the characterizing features of claim 1 and with the characterizing features of the independent method claim.
  • the erfingsdorfe hot water heater with the characterizing features of claim 1 provides a technical solution with which a defect or leakage in the heating circuit of the water heater is detected.
  • the change-over valve by actuating the change-over valve, the external heating circuit is disconnected from the internal heating circuit and the internal heating circuit is connected to the branch line of the internal process water circuit.
  • circulating within the water heater only the water volumes of the primary heat exchanger and the secondary heat exchanger and the internal pipes, which are much lower compared to the water volumes in the heating circuit, so that in a leak within the water heater only the lower, located within the water heater water volumes can escape. No additional components are needed to carry out the invention.
  • a pressure curve in the internal heating circuit to detect a defect with a leak in the internal heating circuit
  • the pressure in the internal heating circuit is constantly monitored by the control unit.
  • the pressure curve indicates a leak when the pressure in the internal heating circuit falls within a short time by a predetermined value.
  • a predetermined pressure curve can be stored as a characteristic curve in the control unit.
  • An effective barrier of the water content of the heating system is achieved when a backflow preventer is used in the flow line, which is expediently in the flow direction behind the branch to the secondary heat exchanger of the hot water circuit.
  • the pressure transducer can be in the return section between Changeover valve and circulating pump and / or be arranged in the flow section in the flow direction behind the branch of the branch line and upstream of the backflow preventer.
  • the water heater is a so-called condensing boiler, which utilizes the heat of condensation of the heating gas, in which case there is a connection of a condensate discharge to a sewer
  • another valve can be actuated after detecting a predetermined pressure profile indicative of water leakage which establishes a connection of the internal heating circuit to the drainage of condensate, so that the heating water in the internal heating circuit can be drained away via the condensate discharge into the sewer.
  • a leak remains almost without major consequences in terms of water damage.
  • FIG. 1 An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description.
  • the single figure shows a hydraulic circuit diagram of a hot water heating system.
  • the illustrated hot water heating system has a water heater 10, to which an external heating circuit 11 is connected with space heaters 12.
  • the water heater 10, which is for example a gas heater, has a primary heat exchanger 13, which is connected to an internal heating circuit 15 and which is heated by, for example, a gas burner 14.
  • the internal heating circuit 15 has a return section 16 and a flow section 17.
  • the feed section 16 is guided to a feed connection 18 formed on the water heater 10 and the return section 19 to a return connection 19.
  • the internal heating circuit 15 is hydraulically coupled to the external heating circuit 11 via the flow connection 18 and the return connection 19, a feed line 21 being connected to the flow connection 18 and a return line 22 of the heating circuit 11 connected to the return connection 19.
  • a circulating pump 20 is looped, which circulates the circulating in the internal heating circuit 15 and the external heating circuit 11 heating water, the heating circuit 15 and the heating circuit 11 form a Schuziernik.
  • Flow section 16 of the heating circuit 15 branches off a branch line 24, which forms a primary circuit for a secondary heat exchanger 25 of a hot water circuit.
  • a switching valve 30 is arranged, which has a third connection to the branch line 24. By means of the switching valve 30, the external heating circuit 11 can be decoupled from the internal heating circuit 15, so that the heating water circulating in the internal heating circuit 15 flows exclusively through the branch line 24 through the secondary heat exchanger 24.
  • the water heater 10 also has a backflow preventer 27, a pressure sensor 28 and a control / regulating unit 29.
  • the backflow preventer 27 is connected so that a backflow of the heating water from the external heating circuit 11 is prevented in the return section 16 or blocked.
  • the pressure sensor 28 is arranged for example in the return section 17 between the switching valve 30 and circulation pump 20.
  • the pressure sensor can also be arranged in the flow section 16 in the flow direction behind the branch of the branch line 24 and before the backflow preventer 27.
  • the pressure sensor 28 is connected via a signal line with the control unit 29 in connection, which is also connected via a control line to the switching valve 30.
  • the control unit 29 further realizes the known control and regulating operations for heat-demand control of the burner 14 and the not shown, guided through the secondary heat exchanger 15 hot water circuit.
  • the recorded by the pressure transducer 28 pressure in the internal heating circuit 15 is constantly detected and evaluated by the control unit 29.
  • a pressure profile is detected and compared with a predetermined pressure profile.
  • the predetermined pressure curve is stored, for example as a characteristic in the Steuer./Regeliki. If the pressure in the internal heating circuit 15 falls within a short time by a predetermined value, this means that the hydraulic systems of the water heater 10 have a leak, so that water leakage can occur.
  • the control unit 29 causes the switching valve 30 to disconnect the internal heating circuit 15 from the external heating circuit 11 and to turn on the branch line 24 so that the internal heating circuit 15 turns on Secondary heat exchanger 25 is performed.
  • the Wassererhitzer10 is hydraulically decoupled from the external heating circuit 11 and due to the backflow preventer 27th the water content of the heating circuit 11 can not flow back into the internal heating circuit 15 of the water heater 10.
  • the Wassererhitzer10 is hydraulically decoupled from the external heating circuit 11 and due to the backflow preventer 27th the water content of the heating circuit 11 can not flow back into the internal heating circuit 15 of the water heater 10.
  • Another specific embodiment relates to water heaters10, which are operated in condensing technology, in which a condensate discharge is provided, which discharges the condensate in a sewer.
  • another valve is incorporated in the internal heating circuit 15.
  • the control unit 29 causes, in addition to the operation of the switching valve 30, as already described, in addition by means of actuation of the other valve, a connection for condensate removal is made, so that the circulating in the internal heating circuit 15 heating water is discharged through the condensate discharge into the sewer.

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)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Abstract

The heating unit has a water heater (10) with an internal heating circuit (15), a circulation pump (20), a switching valve (30), a secondary heat exchanger (25) and a control and regulating unit (29). A pressure receiver (28) is fitted in the internal heating circuit. It sends pressure signals to the control and regulating unit. The control unit can switch on the branch line (24) with the secondary heat exchanger. This separates the internal heating circuit from the external heating circuit (11).

Description

Die Erfindung betrifft eine Warmwasserheizanlage mit einer hydraulischen Schutzschaltung und ein Verfahren zum Betreiben der hydraulischen Schutzschaltung nach dem Oberbegriff der unabhängigen Ansprüche.The invention relates to a hot water heating system with a hydraulic protection circuit and a method for operating the hydraulic protection circuit according to the preamble of the independent claims.

Die bekannten Warmwasserheizanlagen nutzen einen Wassererhitzer, bei dem ein Primärwärmetauscher für einen internen Heizkreis vorgesehen ist, der mit einem externen Heizungskreis verbunden ist, so dass über den Primärwärmetauscher mittels einer Umwälzpumpe ein Heizwasserkreislauf realisiert wird. Der interne Heizkreis ist ferner über eine Zweigleitung mit einem Sekundärwärmetauscher verbundnen, der an einen Brauchwasserkreis angeschlossen ist. Die Verbindung der beiden Kreise erfolgt über ein Drei-Wege-Umschaltventil. Bei einer Wärmeanforderung des Brauchwasserkreises wird vom Umschaltventil die Durchströmung des externen Heizungskreises gesperrt und das Heizwasser des internen Heizkreises wird über die Zweigleitung dem Sekundärwärmetauscher zugeführt.The known hot water heating systems use a water heater, in which a primary heat exchanger is provided for an internal heating circuit, which is connected to an external heating circuit, so that over the primary heat exchanger by means of a circulation pump a Heizwasserkreislauf is realized. The internal heating circuit is also connected via a branch line with a secondary heat exchanger, which is connected to a hot water circuit. The connection of the two circuits via a three-way switching valve. In a heat request of the hot water circuit from the switching valve, the flow through the external heating circuit is disabled and the heating water of the internal heating circuit is supplied via the branch line to the secondary heat exchanger.

Die Heizwasserkreisläufe in Warmwasserheizanlagen sind geschlossene Kreisläufe und stehen unter einem Überdruck von bis zu 3 bar. Je nach Größe der Warmwasserheizanlage kann bei einem Defekt im hydraulischen System des Wassererhitzers eine Wasserleckage auftreten, die unter Umständen einen erheblichen Wasserschaden erzeugen kann. Dabei strömt im Fall eines Lecks im hydraulischen System des Wassererhitzers ein großer Teil des Inhalts des Heizwassers aus dem gesamten Heizwasserkreislauf einschließlich des externen Heizungskreises solange aus, bis der Überdruck abgebaut ist.The heating water circuits in hot water heating systems are closed circuits and are under an overpressure of up to 3 bar. Depending on the size of the hot water heating system, a water leak can occur if there is a defect in the hydraulic system of the water heater, which can potentially cause considerable water damage. In this case, in the event of a leak in the hydraulic system of the water heater, a large part of the contents of the heating water from the entire heating water circuit including the external heating circuit flows out until the overpressure is reduced.

Eine hydraulische Schutzschaltung eines Warmwasserspeichers, der an ein Brauchwassernetz angeschlossen ist, ist aus US 4 607 615 bekannt, wobei eine Ventilanordnung vorgesehen ist, die bei Auftreten eines Lecks oder eines Rohrbruchs den Trinkwasseranschluß vom Warmwasserspeicher trennt.A hydraulic protection circuit of a hot water tank, which is connected to a hot water network is known from US 4,607,615, wherein a valve arrangement is provided which separates the drinking water connection from the hot water tank in the event of a leak or a pipe rupture.

Aufgabe der vorliegenden Erfindung ist es, einen Defekt beziehungsweise eine Leckage im Heizkreis des Wassererhitzers zu detektieren und Vorkehrungen zur Begrenzung eines Wasserschadens zu treffen.The object of the present invention is to detect a defect or a leak in the heating circuit of the water heater and to take measures to limit a water damage.

Vorteile der ErfindungAdvantages of the invention

Die Aufgabe der Erfindung wird mit den kennzeichnenden Merkmalen des Anspruchs 1 sowie mit den kennzeichnenden Merkmalen des unabhängigen Verfahrensanspruchs gelöst.The object of the invention is achieved with the characterizing features of claim 1 and with the characterizing features of the independent method claim.

Die erfingsgemäße Warmwasserheizanlage mit den kennzeichnenden Merkmalen des Anspruchs 1 liefert eine technische Lösung, mit der ein Defekt beziehungsweise eine Leckage im Heizkreis des Wassererhitzers erkannt wird. Gleichzeitig wird durch Betätigen des Umschaltventils der externe Heizungskreis vom internen Heizkreis getrennt und der interne Heizkreis mit der Zweigleitung des internen Brauchwasserkreises verbunden. Dadurch zirkulieren innerhalb des Wassererhitzers lediglich die Wasservolumina des Primärwärmetauschers und des Sekundärwärmetauschers sowie der internen Rohrleitungen, welche gegenüber den Wasservolumina im Heizungskreis wesentlich geringer sind, so dass bei einem Leck innerhalb des Wassererhitzers nur noch die geringeren, innerhalb des Wassererhitzers befindlichen Wasservolumina entweichen können. Zur Ausführung der Erfindung werden keine zusätzlichen Bauteile benötigt.The erfingsgemäße hot water heater with the characterizing features of claim 1 provides a technical solution with which a defect or leakage in the heating circuit of the water heater is detected. At the same time, by actuating the change-over valve, the external heating circuit is disconnected from the internal heating circuit and the internal heating circuit is connected to the branch line of the internal process water circuit. As a result, circulating within the water heater only the water volumes of the primary heat exchanger and the secondary heat exchanger and the internal pipes, which are much lower compared to the water volumes in the heating circuit, so that in a leak within the water heater only the lower, located within the water heater water volumes can escape. No additional components are needed to carry out the invention.

Vorteilhafte Weiterbildungen der Erfmdung gehen aus den Maßnahmen der Unteransprüche hervor. Zweckmäßig ist es, zur Erkennung eines Defektes mit einer Leckage im internen Heizkreis einen Druckverlauf im internen Heizkreis heranzuziehen, wobei der Druck im internen Heizkreis ständig von der Steuer-/Regeleinheit überwacht wird. Der Druckverlauf weist auf eine Leckage hin, wenn der Druck im internen Heizkreis in kurzer Zeit um einen vorgegebenen Wert fällt. Ein vorgegebener Druckverlauf kann dabei als Kennlinie in der Steuer-/Regeleinheit abgelegt werden.Advantageous developments of the invention will become apparent from the measures of the dependent claims. It is useful to use a pressure curve in the internal heating circuit to detect a defect with a leak in the internal heating circuit, the pressure in the internal heating circuit is constantly monitored by the control unit. The pressure curve indicates a leak when the pressure in the internal heating circuit falls within a short time by a predetermined value. A predetermined pressure curve can be stored as a characteristic curve in the control unit.

Eine wirksame Sperre des Wasserinhalts der Heizungsanlage wird dadurch erreicht, wenn ein Rückflußverhinderer in die Vorlaufleitung eingesetzt wird, der zweckmäßigerweise in Strömungsrichtung hinter der Abzweigung zum Sekundärwärmetauscher des Brauchwasserkreises liegt. Der Druckaufnehmer kann im Rücklaufabschnitt zwischen Umschaltventil und Umwälzpumpe und/oder im Vorlaufabschnitt in Strömungsrichtung hinter dem Abzweig der Zweigleitung und vor dem Rückflußverhinderer angeordnet sein.An effective barrier of the water content of the heating system is achieved when a backflow preventer is used in the flow line, which is expediently in the flow direction behind the branch to the secondary heat exchanger of the hot water circuit. The pressure transducer can be in the return section between Changeover valve and circulating pump and / or be arranged in the flow section in the flow direction behind the branch of the branch line and upstream of the backflow preventer.

Handelt es sich bei dem Wassererhitzer um ein sogenanntes Brennwertheizgerät, das die Kondensationswärme des Heizgases ausnutzt, wobei in diesem Fall ein Anschluß einer Kondensatabführung an einen Abwasserkanal vorhanden ist, kann nach dem Detektieren eines vorbestimmten Druckverlaufes, der auf eine Wasserleckage hinweist, ein weiteres Ventil betätigt werden, das eine Verbindung des internen Heizkreise zur Kondensatabführung herstellt, so dass das Heizwasser im internen Heizkreis über die Kondensatabführung in den Abwasserkanal abgeleitet werden kann. Hierbei bleibt eine Leckage nahezu ohne große Folgen was einen Wasserschaden anbetrifft.If the water heater is a so-called condensing boiler, which utilizes the heat of condensation of the heating gas, in which case there is a connection of a condensate discharge to a sewer, another valve can be actuated after detecting a predetermined pressure profile indicative of water leakage which establishes a connection of the internal heating circuit to the drainage of condensate, so that the heating water in the internal heating circuit can be drained away via the condensate discharge into the sewer. In this case, a leak remains almost without major consequences in terms of water damage.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt einen hydraulischen Schaltplan einer Warmwasserheizanlage.An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description. The single figure shows a hydraulic circuit diagram of a hot water heating system.

Ausführungsbeispielembodiment

Die dargestellte Warmwasserheizanlage besitzt einen Wassererhitzer 10, an den ein externer Heizungskreis 11 mit Raumheizkörpern 12 angeschlossen ist. Der Wassererhitzer 10, der beispielsweise ein Gasheizgerät ist, weist einen Primärwärmetauscher 13 auf, der an einen internen Heizkreis 15 angeschlossen ist und der von beispielsweise einem Gasbrenner 14 erwärmt wird. Der interne Heizkreis 15 weist einen Rücklaufabschnitt 16 und einen Vorlaufabschnitt 17 auf. Der Vorlaufabschnitt 16 ist an einen am Wassererhitzer 10 ausgebildeten Vorlaufanschluss 18 und der Rücklaufabschnitt 19 an einen Rücklaufanschluss 19 geführt. Der interne Heizkreis 15 ist über den Vorlaufanschluss 18 und den Rücklaufanschluss 19 hydraulisch an den externen Heizungskreis 11 gekoppelt, wobei an den Vorlaufanschluss 18 eine Vorlaufleitung 21 und an den Rücklaufanschluss 19 eine Rücklaufleitung 22 des Heizungskreises 11 angeschlossen ist.The illustrated hot water heating system has a water heater 10, to which an external heating circuit 11 is connected with space heaters 12. The water heater 10, which is for example a gas heater, has a primary heat exchanger 13, which is connected to an internal heating circuit 15 and which is heated by, for example, a gas burner 14. The internal heating circuit 15 has a return section 16 and a flow section 17. The feed section 16 is guided to a feed connection 18 formed on the water heater 10 and the return section 19 to a return connection 19. The internal heating circuit 15 is hydraulically coupled to the external heating circuit 11 via the flow connection 18 and the return connection 19, a feed line 21 being connected to the flow connection 18 and a return line 22 of the heating circuit 11 connected to the return connection 19.

In den Vorlaufabschnitt 17 ist eine Umwälzpumpe 20 eingeschleift, die das im internen Heizkreis 15 und im externen Heizungskreis 11 zirkulierende Heizwasser umwälzt, wobei der Heizkreis 15 und der Heizungskreis 11 einen Heizwasserkreislauf bilden. Vom Vorlaufabschnitt 16 des Heizkreises 15 zweigt eine Zweigleitung 24 ab, die einen Primärkreis für einen Sekundärwärmetauscher 25 eines Brauchwasserkreises bildet. Im Rücklaufabschnitt 17 ist ein Umschaltventil 30 angeordnet, das einen dritten Anschluß zur Zweigleitung 24 aufweist. Mittels des Umschaltventils 30 läßt sich der externe Heizungskreis 11 vom internen Heizkreis 15 abkoppeln, so dass das im internen Heizkreis 15 zirkulierende Heizwasser ausschließlich über die Zweigleitung 24 durch den Sekundärwärmetauscher 24 strömt.In the lead section 17, a circulating pump 20 is looped, which circulates the circulating in the internal heating circuit 15 and the external heating circuit 11 heating water, the heating circuit 15 and the heating circuit 11 form a Heizwasserkreislauf. from Flow section 16 of the heating circuit 15 branches off a branch line 24, which forms a primary circuit for a secondary heat exchanger 25 of a hot water circuit. In the return section 17, a switching valve 30 is arranged, which has a third connection to the branch line 24. By means of the switching valve 30, the external heating circuit 11 can be decoupled from the internal heating circuit 15, so that the heating water circulating in the internal heating circuit 15 flows exclusively through the branch line 24 through the secondary heat exchanger 24.

Der Wassererhitzer 10 verfügt ferner über einen Rückflußverhinderer 27, einen Druckaufnehmer 28 sowie eine Steuer-/Regeleinheit 29. Der Rückflußverhinderer 27 ist so geschaltet, dass ein Rückfließen des Heizwassers aus dem externen Heizungskreis 11 in den Rücklaufabschnitt 16 unterbunden beziehungsweise gesperrt wird.The water heater 10 also has a backflow preventer 27, a pressure sensor 28 and a control / regulating unit 29. The backflow preventer 27 is connected so that a backflow of the heating water from the external heating circuit 11 is prevented in the return section 16 or blocked.

Der Druckaufnehmer 28 ist beispielsweise im Rücklaufabschnitt 17 zwischen Umschaltventil 30 und Umwälzpumpe 20 angeordnet. Der Druckaufnehmer kann aber auch im Vorlaufabschnitt 16 in Strömungsrichtung hinter dem Abzweig der Zweigleitung 24 und vor dem Rückflußverhinderer 27 angeordnet sein.The pressure sensor 28 is arranged for example in the return section 17 between the switching valve 30 and circulation pump 20. The pressure sensor can also be arranged in the flow section 16 in the flow direction behind the branch of the branch line 24 and before the backflow preventer 27.

Der Druckaufnehmer 28 steht über eine Signalleitung mit der Steuer-/Regeleinheit 29 in Verbindung, die außerdem über eine Steuerleitung mit dem Umschaltventil 30 verbunden ist. Die Steuer-/Regeleinheit 29 realisiert ferner die an sich bekannten Steuer- und Regelvorgänge zur wärmebedarfsrechten Regelung des Brenners 14 sowie des nicht dargestellten, über den Sekundärwärmetauscher 15 geführten Brauchwasserkreises.The pressure sensor 28 is connected via a signal line with the control unit 29 in connection, which is also connected via a control line to the switching valve 30. The control unit 29 further realizes the known control and regulating operations for heat-demand control of the burner 14 and the not shown, guided through the secondary heat exchanger 15 hot water circuit.

Der vom Druckaufnehmer 28 aufgenommene Druck im internen Heizkreis 15 wird von der Steuer-/Regeleinheit 29 ständig erfasst und ausgewertet. Dabei wird ein Druckverlauf erfasst und mit einem vorbestimmten Druckverlauf verglichen. Der vorbestimmte Druckverlauf ist beispielsweise als Kennlinie in der Steuer-./Regeleinheit abgelegt. Fällt der Druck im internen Heizkreis 15 in kurzer Zeit um einen vorgegebenen Wert, bedeutet dies, dass die hydraulischen Systeme des Wassererhitzers 10 ein Leck aufweisen, so dass eine Wasserleckage auftreten kann. Wird ein derartiger, vorbestimmter Druckverlauf von der Steuer-/Regeleinheit 29 detektiert, veranlasst die Steuer-/Regeleinheit 29, dass das Umschaltventil 30 den internen Heizkreis 15 vom externen Heizungskreis 11 abkoppelt und die Zweigleitung 24 zuschaltet, so dass der interne Heizkreis 15 über den Sekundärwärmetauscher 25 geführt wird. Dadurch ist der Wassererhitzer10 vom externen Heizungskreis 11 hydraulisch entkoppelt und auf Grund des Rückflußverhinderers 27 kann der Wasserinhalt des Heizungskreises 11 nicht zurück in den internen Heizkreis 15 des Wassererhitzers 10 fließen. Dadurch können bei einem Leck innerhalb des Wassererhitzers 10 nur noch die geringeren, innerhalb des Wassererhitzers 10 befindlichen Wasservolumina entweichen.The recorded by the pressure transducer 28 pressure in the internal heating circuit 15 is constantly detected and evaluated by the control unit 29. In this case, a pressure profile is detected and compared with a predetermined pressure profile. The predetermined pressure curve is stored, for example as a characteristic in the Steuer./Regeleinheit. If the pressure in the internal heating circuit 15 falls within a short time by a predetermined value, this means that the hydraulic systems of the water heater 10 have a leak, so that water leakage can occur. When such a predetermined pressure waveform is detected by the control unit 29, the control unit 29 causes the switching valve 30 to disconnect the internal heating circuit 15 from the external heating circuit 11 and to turn on the branch line 24 so that the internal heating circuit 15 turns on Secondary heat exchanger 25 is performed. As a result, the Wassererhitzer10 is hydraulically decoupled from the external heating circuit 11 and due to the backflow preventer 27th the water content of the heating circuit 11 can not flow back into the internal heating circuit 15 of the water heater 10. As a result, in the event of a leak within the water heater 10, only the smaller volumes of water located within the water heater 10 can escape.

Eine weitere spezielle Ausführungsform betrifft Wassererhitzer10, die in Brennwerttechnik betrieben werden, bei denen eine Kondensatabführung vorgesehen ist, die das Kondensat in einen Abwasserkanal abführt. Bei dieser Ausführungsform ist ein weiteres Ventil in den internen Heizkreis 15 eingebunden. Im Fall der Detektierung des vorbestimmten Druckverlaufes durch die Steuer-/Regeleinheit 29 veranlasst die Steuer-/Regeleinheit 29, dass neben der Betätigung des Umschaltventils 30, wie bereist beschrieben, zusätzlich mittels einer Betätigung des weiteren Ventils eine Verbindung zur Kondensatabführung hergestellt wird, so dass das im internen Heizkreis 15 zirkulierende Heizwasser über die Kondensatabführung in den Abwasserkanal abgeleitet wird. Durch diese Maßnahme bleibt eine Wasserleckage im Wassererhitzer 10 nahezu ohne große Folgen.Another specific embodiment relates to water heaters10, which are operated in condensing technology, in which a condensate discharge is provided, which discharges the condensate in a sewer. In this embodiment, another valve is incorporated in the internal heating circuit 15. In the case of the detection of the predetermined pressure profile by the control unit 29, the control unit 29 causes, in addition to the operation of the switching valve 30, as already described, in addition by means of actuation of the other valve, a connection for condensate removal is made, so that the circulating in the internal heating circuit 15 heating water is discharged through the condensate discharge into the sewer. By this measure, a water leak in the water heater 10 remains almost without major consequences.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

  • 10 assererhitzer10 water heater
  • 11externer Heizungskreis11external heating circuit
  • 12 Raumheizkörper12 space heaters
  • 13 Primärwärmetauscher13 primary heat exchanger
  • 14 Gasbrenner14 gas burners
  • 15 interner Heizkreis15 internal heating circuit
  • 16 Vorlaufabschnitt16 flow section
  • 17 Rücklaufabschnitt17 return section
  • 18 Vorlaufanschluß18 supply connection
  • 19 Rücklaufanschluß19 return connection
  • 20 Umwälzpumpe20 circulation pump
  • 21 Vorlaufleitung21 supply line
  • 22 Rücklaufleitung22 return line
  • 24 Brauchwasserzweigleitung24 service water branch line
  • 25 sekundär Wärmetauscher25 secondary heat exchanger
  • 27 Rückflußverhinderer27 backflow preventer
  • 28 Druckgeber28 pressure transmitter
  • 29 Steuer-/Regeleinheit29 control unit
  • 30 Umschaltventil30 changeover valve

Claims (10)

Warmwasserheizanlage mit einem Wassererhitzer (10), der einen internen Heizkreis (15), eine Umwälzpumpe (20), ein Umschaltventil (30), einen Sekundärwärmetauscher (25) und eine Steuer-/Regeleinheit (29) aufweist, sowie mit einem externen Heizungskreis (11), der an den internen Heizkreis (15) angeschlossen ist, wobei der interne Heizkreis (15) mit einen Primärwärmetauscher (13) verbunden ist und wobei der Sekundärwärmetauscher (25) mittels des Umschaltventils (30) über eine Zweigleitung (24) an den internen Heizkreis (15) ankoppelbar ist, dadurch gekennzeichnet, dass ein Druckaufnehmer (28) im internen Heizkreis (15) angeordnet ist, dass das vom Druckaufnehmer (29) erfasste Drucksignal der Steuer-/Regeleinheit (29) zugeführt ist, und dass mittels des Umschaltventils (30) die Zweigleitung (24) mit dem Sekundärwärmetauscher (25) zuschaltbar ist und dabei der interne Heizkreis (15) vom externen Heizungskreis (11) getrennt wird, sobald die Steuer-/Regeleinheit (29) aus dem vom Druckaufnehmer (28) erfassten Drucksignal ein Schaltsignal detektiert.Hot water heating system with a water heater (10) having an internal heating circuit (15), a circulation pump (20), a switching valve (30), a secondary heat exchanger (25) and a control unit (29), and with an external heating circuit ( 11) which is connected to the internal heating circuit (15), wherein the internal heating circuit (15) is connected to a primary heat exchanger (13) and wherein the secondary heat exchanger (25) by means of the switching valve (30) via a branch line (24) to the internal heating circuit (15) can be coupled, characterized in that a pressure sensor (28) in the internal heating circuit (15) is arranged, that the pressure sensor (29) detected pressure signal of the control / regulating unit (29) is supplied, and that by means of Switching valve (30) the branch line (24) with the secondary heat exchanger (25) is switchable while the internal heating circuit (15) from the external heating circuit (11) is disconnected as soon as the control unit (29) from the Dr uckaufnehmer (28) detected pressure signal detected a switching signal. Warmwasserheizanlage nach Anspruch 1, dadurch gekennzeichnet, dass das Schaltsignal von einem Druckverlauf gebildet ist, der eine vorgegebene Druckänderung pro Zeit repräsentiert.Hot water heating system according to claim 1, characterized in that the switching signal is formed by a pressure profile representing a predetermined pressure change per time. Warmwasserheizanlage nach Anspruch 1,oder 2, dadurch gekennzeichnet, dass im internen Heizkreis (15) ein Rückflußverhinderer (27) in Strömungsrichtung hinter der Zweigleitung (24) angeordnet ist.Hot water heating system according to claim 1 or 2, characterized in that in the internal heating circuit (15) a backflow preventer (27) in the flow direction behind the branch line (24) is arranged. Warmwasserheizanlage nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass der Druckaufnehmer (28) im internen Heizkreis (15) im Rücklaufabschnitt (17) zwischen dem Umschaltventil (30) und der Umwälzpumpe (20) angeordnet ist.Hot water heating system according to claim 1, 2 or 3, characterized in that the pressure sensor (28) in the internal heating circuit (15) in the return section (17) between the switching valve (30) and the circulation pump (20) is arranged. Warmwasserheizanlage nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass der Druckaufnehmer (28) im internen Heizkreis (15) im Vorlaufabschnitt (16) in Strömungsrichtung vor dem Rückflußverhinderer (27) angeordnet ist.Hot water heating system according to claim 1, 2 or 3, characterized in that the pressure transducer (28) in the internal heating circuit (15) in the flow section (16) in the flow direction in front of the backflow preventer (27) is arranged. Warmwasserheizanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass im internen Heizkreis (15) ein weiteres Ventil angeordnet ist, über das eine Verbindung zu einer Kondensatabführung herstellbar ist, und dass bei Detektierung des Schaltsignals mittels des weiteren Ventils eine hydraulische Verbindung zwischen dem internen Heizkreis (15) und der Kondensatabführung herstellbar ist.Hot water heating system according to one of the preceding claims, characterized in that in the internal heating circuit (15) a further valve is arranged, via which a connection to a condensate discharge can be produced, and that upon detection of the switching signal by means of the further valve, a hydraulic connection between the internal heating (15) and the condensate removal can be produced. Warmwasserheizanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, das ein vorbestimmter Druckverlauf als Kennlinie in der Steuer-/Regeleinheit (29) abgelegt ist.Hot water heating system according to one of the preceding claims, characterized in that a predetermined pressure curve is stored as a characteristic curve in the control / regulating unit (29). Verfahren zum Betreiben einer Warmwasserheizanlage nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass sobald die Steuer-/Regeleinheit aus einem vom Druckaufnehmer erfaßten Drucksignal ein Schaltsignal detektiert, welches das Umschaltventil ansteuert, und dass bei Ansteuerung des Umschaltventils der interne Heizkreis vom externen Heizungskreis getrennt und die Zweigleitung mit dem Sekundärwärmetauscher zugeschaltet wird.Method for operating a hot water heating system according to one of claims 1 to 6, characterized in that as soon as the control unit detects a detected from the pressure transducer pressure signal, a switching signal which controls the switching valve, and that upon activation of the switching valve, the internal heating circuit from the external heating circuit separated and the branch line is connected to the secondary heat exchanger. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das Schaltsignal von einem vorgegebenen Druckverlauf gebildet wird, der eine vorgegebenen Druckänderung pro Zeit repräsentiert.A method according to claim 7, characterized in that the switching signal is formed by a predetermined pressure curve, which represents a predetermined pressure change per time. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass der vorgegebene Druckverlauf dann vorliegt, wenn im internen Heizkreis in einer vorbestimmten Zeit ein vorgegebener Druckwert vorliegt.A method according to claim 8, characterized in that the predetermined pressure curve is present when a predetermined pressure value is present in the internal heating circuit in a predetermined time.
EP05104842A 2004-07-21 2005-06-03 Warm water heating installation with hydraulic protection circuit and method for operating the same. Expired - Fee Related EP1619453B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004035298A DE102004035298B4 (en) 2004-07-21 2004-07-21 Hot water heating system with a hydraulic protection circuit and method for operating the same

Publications (2)

Publication Number Publication Date
EP1619453A1 true EP1619453A1 (en) 2006-01-25
EP1619453B1 EP1619453B1 (en) 2011-08-10

Family

ID=35124385

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05104842A Expired - Fee Related EP1619453B1 (en) 2004-07-21 2005-06-03 Warm water heating installation with hydraulic protection circuit and method for operating the same.

Country Status (2)

Country Link
EP (1) EP1619453B1 (en)
DE (1) DE102004035298B4 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2957837A1 (en) * 2014-06-05 2015-12-23 Robert Bosch Gmbh Heating system and method for operating a heating system
CN112146265A (en) * 2020-09-04 2020-12-29 珠海格力电器股份有限公司 Multistage accurate temperature control water heater and control method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007041766B4 (en) 2007-09-04 2012-04-19 Frank Triesch Leakage monitoring of systems with at least two media circuits, in particular heat exchangers
DE102019130932A1 (en) * 2019-11-15 2021-05-20 Viessmann Werke Gmbh & Co Kg Procedure for operating a heat pump

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3740137A1 (en) * 1987-11-26 1989-06-08 Norbert Scherer Method of protecting water circuits in buildings connected directly to district heating networks
DE4433387A1 (en) * 1993-09-16 1995-03-23 Vaillant Joh Gmbh & Co Controller
DE19923296A1 (en) * 1999-05-21 2000-12-07 Baelz Gmbh Helmut Central heating supply installation includes sensors and control system enabling shut-down in event of remote fault at point of delivery

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4607615A (en) * 1985-03-28 1986-08-26 Boals Wayne S Automatic control system for water heaters
DE3705565A1 (en) * 1987-02-21 1988-09-01 Ewald Hennel Process for monitoring the system of pipes in a hot-water heating installation
DE10042510A1 (en) * 2000-08-30 2001-12-13 Bosch Gmbh Robert The noise of water circulated heated systems is eliminated by a sound sensor and electronic control system.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3740137A1 (en) * 1987-11-26 1989-06-08 Norbert Scherer Method of protecting water circuits in buildings connected directly to district heating networks
DE4433387A1 (en) * 1993-09-16 1995-03-23 Vaillant Joh Gmbh & Co Controller
DE19923296A1 (en) * 1999-05-21 2000-12-07 Baelz Gmbh Helmut Central heating supply installation includes sensors and control system enabling shut-down in event of remote fault at point of delivery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2957837A1 (en) * 2014-06-05 2015-12-23 Robert Bosch Gmbh Heating system and method for operating a heating system
CN112146265A (en) * 2020-09-04 2020-12-29 珠海格力电器股份有限公司 Multistage accurate temperature control water heater and control method

Also Published As

Publication number Publication date
EP1619453B1 (en) 2011-08-10
DE102004035298A1 (en) 2006-03-16
DE102004035298B4 (en) 2006-08-17

Similar Documents

Publication Publication Date Title
DE3905054C1 (en)
AT401433B (en) METHOD FOR CONTROLLING A PLANT FOR CONDUCTING A MEDIUM UNDER PRESSURE THROUGH PIPES OF A SUPPLY TO ONE OR MORE CONSUMERS, AND A PLANT OF THIS PLANT
DE102008001308B3 (en) Storage tank for use in e.g. paper factory, has control device guiding fluid flow with higher temperature through outlets or inlets on higher height level and fluid flow with lower temperature through outlets or inlets on lower height level
EP1619453B1 (en) Warm water heating installation with hydraulic protection circuit and method for operating the same.
EP2993271B1 (en) Control device and drinking water and/or domestic water system with such a control device
US6485636B1 (en) Dual filter for diesel engine
DE3622139A1 (en) Water supply installation
DE4025570C2 (en)
EP2821713A2 (en) Method for feeding feedwater into a heating system and heating system
EP0580881B1 (en) Apparatus for degassing liquids in liquid circuits
EP2598809B1 (en) Protective device, instantaneous water heater and fluid reservoir
AT508007B1 (en) MOUNTING BLOCK FOR CONNECTING DEVICES
EP2924286A2 (en) Testing device for pumps
DE1600733A1 (en) Pressure reducer
EP0189499B1 (en) Tube disconnector
DE102007031084B4 (en) Sewer pipe with heat exchanger element
DE19701823B4 (en) Water heating system
DE10254889B4 (en) Control technology solution for a water heating system
DE10151253C1 (en) Hot water supply operating method uses flow noise for identifying operated hot water tap with corresponding regulation of water temperature
DE10118343B4 (en) heating system
DE3033156A1 (en) METHOD AND DEVICE FOR MONITORING WATER CONDUCTING LINES AGAINST BACKLOCK
EP1327762B1 (en) Method, computer programme and control and/or regulation device for operating an internal combustion engine, and internal combustion engine
DE3233111A1 (en) Use water circulation arrangement for hot water
DE102010036916A1 (en) Back pressure block i.e. pipe piece, for sewer of pipe line in sewage system of building, has pipe line portion whose pumping pressure is larger than back pressure outside pipe line portion, where locking elements closes pipe line portion
DE1679354C3 (en) Three-way valve for a gas-heated circulation water heater

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR LV MK YU

17P Request for examination filed

Effective date: 20060725

AKX Designation fees paid

Designated state(s): DE FR GB IT

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502005011742

Country of ref document: DE

Effective date: 20111006

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20120511

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502005011742

Country of ref document: DE

Effective date: 20120511

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20130703

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20140620

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20140625

Year of fee payment: 10

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20150227

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140630

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20150804

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150603

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20150603

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150603

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502005011742

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170103