EP1619453B1 - 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 PDFInfo
- Publication number
- EP1619453B1 EP1619453B1 EP05104842A EP05104842A EP1619453B1 EP 1619453 B1 EP1619453 B1 EP 1619453B1 EP 05104842 A EP05104842 A EP 05104842A EP 05104842 A EP05104842 A EP 05104842A EP 1619453 B1 EP1619453 B1 EP 1619453B1
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- EP
- European Patent Office
- Prior art keywords
- heating circuit
- internal heating
- hot water
- circuit
- internal
- Prior art date
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- 238000010438 heat treatment Methods 0.000 title claims description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 60
- 238000000034 method Methods 0.000 title claims description 7
- 238000009434 installation Methods 0.000 title 1
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims 1
- 239000008236 heating water Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
Images
Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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.
- a heating system is from document DE-A-4 433 387 already known.
- 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 off US 4,607,615 known, wherein a valve arrangement is provided, which separates the drinking water connection from the hot water tank when a leak or a pipe break occurs.
- 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 leakage 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 17 and a flow section 16.
- 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 25.
- 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.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Description
Die Erfindung betrifft eine Warmwasserheizanlage mit einer hydraulischen Schutzschaltung und ein Verfahren zum Betreiben der hydraulischen Schutzschaltung nach dem Oberbegriff der unabhängigen Ansprüche. Eine solche Heizanlage ist aus Dokument
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
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.
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 leakage 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.
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.
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 17 und einen Vorlaufabschnitt 16 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
In den Vorlaufabschnitt 16 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 25 strömt.In the
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
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
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
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
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
- 10 assererhitzer10 water heater
- 11 externer Heizungskreis11 external 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)
- A hot water heating system comprising a water heater (10), which comprises an internal heating circuit (15), a circulating pump (20), a changeover valve (30), a secondary heat exchanger (25) and a control/regulating unit (29), and comprising 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) can be coupled to the internal heating circuit (15) by means of the changeover valve (30) via a branch line (24), characterised in that a pressure transducer (28) is disposed in the internal heating circuit (15), that the pressure signal recorded by the pressure transducer (28) is supplied to the control/regulating unit (29) and that the branch line (24) can be connected by means of the changeover valve (30) to the secondary heat exchanger (25) and the internal circuit (15) is thereby separated from the external heating circuit (11) as soon as the control/regulating unit (29) detects a switching signal from the pressure signal recorded by the pressure transducer (28).
- The hot water heating system according to claim 1, characterised in that the switching signal is formed by a pressure profile which represents a predetermined pressure change per time.
- The hot water heating system according to claim 1 or 2, characterised in that a backflow preventer (27) is disposed in the internal heating circuit (15) downstream of the branch line (24) in the flow direction.
- The hot water heating system according to claim 1, 2 or 3, characterised in that the pressure transducer (28) is disposed in the internal heating circuit (15) in the return section (17) between the changeover valve (30) and the circulating pump (20).
- The hot water heating system according to claim 3, characterised in that the pressure transducer (28) is disposed in the internal heating circuit (15) in the flow section (16) upstream of the backflow preventer (27) in the flow direction.
- The hot water heating system according to any one of the preceding claims, characterised in that a further valve is disposed in the internal heating circuit (15), via which a connection can be made to a condensate drain and that upon detection of the switching signal, a hydraulic connection can be made by means of the further valve between the internal heating circuit (15) and the condensate drain.
- The hot water heating system according to any one of the preceding claims, characterised in that a predetermined pressure profile is stored as a characteristic line in the control/regulating unit (29).
- A method for operating a hot water system according to any one of claims 1 to 6, characterised in that as soon as the control/regulating unit (29) detects a switching signal from a pressure signal detected by the pressure transducer (28), the changeover valve (30) is triggered and that upon triggering of the changeover valve (30) the internal heating circuit (15) is separated from the external heating circuit (11) and the branch line (24) is connected to the secondary heat exchanger (25).
- The method according to claim 7, characterised in that the switching signal is formed by a predetermined pressure profile which represents a predetermined pressure change per time.
- The method according to claim 8, characterised in that the predetermined pressure profile exists when a predetermined pressure value exists in the internal heating circuit in a predetermined time.
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 EP1619453A1 (en) | 2006-01-25 |
| EP1619453B1 true EP1619453B1 (en) | 2011-08-10 |
Family
ID=35124385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05104842A Not-in-force 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) |
Families Citing this family (4)
| 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 |
| DE102014210745A1 (en) * | 2014-06-05 | 2015-12-17 | Robert Bosch Gmbh | Heating system and method for operating a heating system |
| DE102019130932A1 (en) * | 2019-11-15 | 2021-05-20 | Viessmann Werke Gmbh & Co Kg | Procedure for operating a heat pump |
| 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 |
Family Cites Families (6)
| 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 |
| DE3740137A1 (en) * | 1987-11-26 | 1989-06-08 | Norbert Scherer | Method of protecting water circuits in buildings connected directly to district heating networks |
| AT399955B (en) * | 1993-09-16 | 1995-08-25 | Vaillant Gmbh | CONTROL CIRCUIT |
| 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 |
| 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. |
-
2004
- 2004-07-21 DE DE102004035298A patent/DE102004035298B4/en not_active Expired - Fee Related
-
2005
- 2005-06-03 EP EP05104842A patent/EP1619453B1/en not_active Not-in-force
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004035298B4 (en) | 2006-08-17 |
| DE102004035298A1 (en) | 2006-03-16 |
| EP1619453A1 (en) | 2006-01-25 |
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