EP4209719B1 - Method for operating a heating system comprising a membrane expansion vessel - Google Patents

Method for operating a heating system comprising a membrane expansion vessel Download PDF

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Publication number
EP4209719B1
EP4209719B1 EP23150526.4A EP23150526A EP4209719B1 EP 4209719 B1 EP4209719 B1 EP 4209719B1 EP 23150526 A EP23150526 A EP 23150526A EP 4209719 B1 EP4209719 B1 EP 4209719B1
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European Patent Office
Prior art keywords
heating system
expansion vessel
operating
difference
pressure
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EP23150526.4A
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German (de)
French (fr)
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EP4209719A1 (en
Inventor
Michael Kirchhoff
Carsten Kuhlmann
Robin Stein
Jens Krug
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.)
Viessmann Climate Solutions SE
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Viessmann Climate Solutions SE
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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
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks
    • F24D3/1016—Tanks having a bladder
    • 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
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • 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
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • F24D19/1036—Having differential pressure measurement facilities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/02—Fluid distribution means
    • F24D2220/0278—Expansion vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/046—Pressure sensors

Definitions

  • the invention relates to a method for operating a heating system having a membrane expansion vessel according to the preamble of patent claim 1.
  • a method of the type mentioned above is known from the patent document DE 103 35 310 B3 known.
  • a first pressure in the heating system at a first operating temperature and a second pressure in the heating system at a second operating temperature are recorded within individual measuring intervals.
  • This method is used to determine whether water has passed from the water side to the gas side in the membrane expansion vessel, which is known to have a water side and a gas side separated by an elastic membrane.
  • the invention is based on the object of improving a method of the type mentioned at the beginning.
  • a method is to be created with which a gas transfer from the gas side to the water side can also be determined.
  • a first difference between the first and second pressure from one measuring interval is compared with a second difference between the first and second pressure from another measuring interval and a signal is generated when a predetermined deviation between the differences occurs.
  • the solution according to the invention is characterized by the fact that the pre-pressure of a heating system is automatically monitored by targeted evaluation of trended pressure data.
  • An evaluation algorithm is provided that makes it possible to locate the cause in the event of a falling system pressure.
  • the solution according to the invention makes it possible to make statements about the condition of the gas cushion in the diaphragm expansion vessel. This makes it possible to check the diaphragm expansion vessel on an ad hoc basis during maintenance if this is necessary. If, however, a stable pre-pressure of the diaphragm expansion vessel is detected, the check can be omitted.
  • the solution according to the invention therefore significantly reduces the time required for system maintenance.
  • the Figures 1 and 2 serve, as already mentioned, to explain the method according to the invention for operating a heating system having a membrane expansion vessel.
  • a first pressure in the heating system at a first operating temperature and a second pressure in the heating system at a second operating temperature are recorded in a manner known per se within individual measuring intervals.
  • the first operating temperature is preferably set when the heat source is switched on (for example an oil or gas burner) and the second operating temperature when the heat source is switched off.
  • the pressure of the water in the heating circuit of the heating system is preferably measured using a suitable pressure sensor.
  • a first difference between the first and second pressure from one measuring interval is compared with a second difference between the first and second pressure from another measuring interval and a signal is generated from a predetermined deviation between the differences.
  • measurement data determined in a measurement interval are stored (in a suitable memory).
  • a reference mean value is formed between the first and second pressure, that during operation of the heating system, an instantaneous mean value is formed between the first and second pressure, and that a signal is generated as of a predetermined difference between the reference mean value and the instantaneous mean value.
  • a next measuring interval is started after completion of a measuring interval.

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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)
  • Measuring Fluid Pressure (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betrieb einer ein Membranausdehnungsgefäß aufweisenden Heizungsanlage gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for operating a heating system having a membrane expansion vessel according to the preamble of patent claim 1.

Ein Verfahren der eingangs genannten Art ist aus dem Patentdokument DE 103 35 310 B3 bekannt. Bei diesem wird innerhalb einzelner Messintervalle einerseits ein erster Druck in der Heizungsanlage bei einer ersten Betriebstemperatur und andererseits ein zweiter Druck der Heizungsanlage bei einer zweiten Betriebstemperatur erfasst. Dieses Verfahren dient dazu, festzustellen, ob es im Membranausdehnungsgefäß, das bekanntlich und abgegrenzt durch eine elastische Membran eine Wasser- und eine Gasseite aufweist, zu einem Wasserübertritt von der Wasser- zur Gasseite gekommen ist.A method of the type mentioned above is known from the patent document DE 103 35 310 B3 known. In this method, a first pressure in the heating system at a first operating temperature and a second pressure in the heating system at a second operating temperature are recorded within individual measuring intervals. This method is used to determine whether water has passed from the water side to the gas side in the membrane expansion vessel, which is known to have a water side and a gas side separated by an elastic membrane.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu verbessern. Insbesondere soll ein Verfahren geschaffen werden, mit dem auch ein Gasübertritt von der Gas- zur Wasserseite ermittelbar ist.The invention is based on the object of improving a method of the type mentioned at the beginning. In particular, a method is to be created with which a gas transfer from the gas side to the water side can also be determined.

Diese Aufgabe ist mit einem Verfahren der eingangs genannten Art durch die im Kennzeichen des Patentanspruchs 1 aufgeführten Merkmale gelöst.This object is achieved by a method of the type mentioned at the outset by the features listed in the characterising part of patent claim 1.

Nach der Erfindung ist also vorgesehen, dass zur Prüfung der Funktionstüchtigkeit der Heizungsanlage mit ihrem Membranausdehnungsgefäß ein erster Differenzbetrag zwischen dem ersten und zweiten Druck aus einem Messintervall mit einem zweiten Differenzbetrag zwischen dem ersten und zweiten Druck aus einem anderen Messintervall verglichen und ab einer vorbestimmten Abweichung zwischen den Differenzbeträgen ein Signal erzeugt wird.According to the invention, it is therefore provided that in order to test the functionality of the heating system with its diaphragm expansion vessel, a first difference between the first and second pressure from one measuring interval is compared with a second difference between the first and second pressure from another measuring interval and a signal is generated when a predetermined deviation between the differences occurs.

Mit anderen Worten zeichnet sich die erfindungsgemäße Lösung somit dadurch aus, dass der Vordruck einer Heizungsanlage durch gezielte Auswertung getrendeter Druckdaten automatisch überwacht wird. Dabei ist ein Auswertungsalgorithmus vorgesehen, der es ermöglicht, im Falle eines sinkenden Anlagendrucks die Ursache zu verorten. Außerdem ermöglicht die erfindungsgemäße Lösung Aussagen über den Zustand des Gaspolsters im Membranausdehnungsgefäß. So ist es möglich, die Überprüfung des Membranausdehnungsgefäßes bei der Wartung anlassbezogen vorzunehmen, falls das notwendig ist. Wird dagegen ein stabiler Vordruck des Membranausdehnungsgefäß detektiert, kann die Überprüfung entfallen. Die erfindungsgemäße Lösung reduziert dadurch den Zeitaufwand bei der Anlagenwartung deutlich.In other words, the solution according to the invention is characterized by the fact that the pre-pressure of a heating system is automatically monitored by targeted evaluation of trended pressure data. An evaluation algorithm is provided that makes it possible to locate the cause in the event of a falling system pressure. In addition, the solution according to the invention makes it possible to make statements about the condition of the gas cushion in the diaphragm expansion vessel. This makes it possible to check the diaphragm expansion vessel on an ad hoc basis during maintenance if this is necessary. If, however, a stable pre-pressure of the diaphragm expansion vessel is detected, the check can be omitted. The solution according to the invention therefore significantly reduces the time required for system maintenance.

Andere vorteilhafte Weiterbildungen ergeben sich aus den abhängigen Patentansprüchen.Other advantageous developments arise from the dependent patent claims.

Der Vollständigkeit halber wird noch auf das Dokument DE 10 2020 207 057 A1 hingewiesen. Bei dieser Lösung wird aber insbesondere kein erster Differenzbetrag zwischen dem ersten und zweiten Druck aus einem Messintervall mit einem zweiten Differenzbetrag zwischen dem ersten und zweiten Druck aus einem anderen Messintervall verglichen.For the sake of completeness, reference is made to the document EN 10 2020 207 057 A1 However, in this solution, in particular, no first difference between the first and second pressure from one measuring interval is compared with a second difference between the first and second pressure from another measuring interval.

Das erfindungsgemäße Verfahren einschließlich seiner vorteilhaften Weiterbildungen gemäß der abhängigen Patentansprüche wird nachfolgend anhand der zeichnerischen Darstellung eines bevorzugten Ausführungsbeispiels näher erläutert.The method according to the invention including its advantageous developments according to the dependent patent claims is explained in more detail below using the graphic representation of a preferred embodiment.

Es zeigt

Figur 1
einen typischen Verlauf (Druck p über der Zeit t) bei einem Verlust auf der Wasserseite; und
Figur 2
einen typischen Verlauf (Druck p über der Zeit t) bei einem Verlust auf der Gasseite.
It shows
Figure 1
a typical curve (pressure p versus time t) for a loss on the water side; and
Figure 2
a typical curve (pressure p over time t) for a loss on the gas side.

Die Figuren 1 und 2 dienen, wie bereits erwähnt, zur Erläuterung des erfindungsgemäßen Verfahrens zum Betrieb einer ein Membranausdehnungsgefäß aufweisenden Heizungsanlage. Bei diesen Verfahren wird zunächst in an sich bekannter Weise innerhalb einzelner Messintervalle einerseits ein erster Druck in der Heizungsanlage bei einer ersten Betriebstemperatur und andererseits ein zweiter Druck der Heizungsanlage bei einer zweiten Betriebstemperatur erfasst. Die erste Betriebstemperatur stellt sich dabei vorzugsweise bei eingeschalteter Wärmequelle (zum Beispiel ein Öl- oder Gasbrenner) und die zweite Betriebstemperatur bei ausgeschalteter Wärmequelle ein. Außerdem wird bevorzugt der Druck des Wassers im Heizkreis der Heizungsanlage mit einem geeigneten Drucksensor gemessen.The Figures 1 and 2 serve, as already mentioned, to explain the method according to the invention for operating a heating system having a membrane expansion vessel. In these methods, a first pressure in the heating system at a first operating temperature and a second pressure in the heating system at a second operating temperature are recorded in a manner known per se within individual measuring intervals. The first operating temperature is preferably set when the heat source is switched on (for example an oil or gas burner) and the second operating temperature when the heat source is switched off. In addition, the pressure of the water in the heating circuit of the heating system is preferably measured using a suitable pressure sensor.

Wesentlich für das erfindungsgemäße Verfahren ist nun, dass zur Prüfung der Funktionstüchtigkeit der Heizungsanlage mit ihrem Membranausdehnungsgefäß ein erster Differenzbetrag zwischen dem ersten und zweiten Druck aus einem Messintervall mit einem zweiten Differenzbetrag zwischen dem ersten und zweiten Druck aus einem anderen Messintervall verglichen und ab einer vorbestimmten Abweichung zwischen den Differenzbeträgen ein Signal erzeugt wird. Dabei ist besonders bevorzugt vorgesehen, dass in einem Messintervall ermittelte Messdaten (in einem geeigneten Speicher) abgespeichert werden.What is essential for the method according to the invention is that, in order to test the functionality of the heating system with its membrane expansion vessel, a first difference between the first and second pressure from one measuring interval is compared with a second difference between the first and second pressure from another measuring interval and a signal is generated from a predetermined deviation between the differences. In this case, it is particularly preferred that that measurement data determined in a measurement interval are stored (in a suitable memory).

Noch etwas genauer betrachtet, ist dabei besonders bevorzugt vorgesehen, dass bei Initialisierung der Heizungsanlage ein Referenzmittelwert zwischen dem ersten und zweiten Druck gebildet wird, dass während des Betriebs der Heizungsanlage ein Momentanmittelwert zwischen dem ersten und zweiten Druck gebildet wird und dass ab einer vorgegebenen Differenz zwischen dem Referenzmittelwert und dem Momentanmittelwert ein Signal erzeugt wird.Looking at it in more detail, it is particularly preferred that when the heating system is initialized, a reference mean value is formed between the first and second pressure, that during operation of the heating system, an instantaneous mean value is formed between the first and second pressure, and that a signal is generated as of a predetermined difference between the reference mean value and the instantaneous mean value.

Zur Realisierung einer möglichst permanenten Überwachung ist ferner bevorzugt vorgesehen, dass während des Betriebs der Heizungsanlage nach Beendigung eines Messintervalls ein nächstes Messintervall begonnen wird.In order to achieve the most permanent monitoring possible, it is also preferably provided that during operation of the heating system, a next measuring interval is started after completion of a measuring interval.

Mit Bezug auf Figur 1 ist ferner bevorzugt vorgesehen, dass, wenn der erste Differenzbetrag kleiner als der zweite Differenzbetrag ist, ein auf einen (ungewollten) Wasserübertritt (also auf einen Verlust auf der Wasserseite) hinweisendes Signal erzeugt wird.Regarding Figure 1 It is further preferably provided that, if the first difference is smaller than the second difference, a signal is generated indicating an (unwanted) water overflow (i.e. a loss on the water side).

Mit Bezug auf Figur 2 ist weiterhin bevorzugt vorgesehen, dass, wenn der erste Differenzbetrag größer als der zweite Differenzbetrag ist, ein auf einen (ungewollten) Gasübertritt (also auf einen Verlust auf der Gasseite) hinweisendes Signal erzeugt wird.Regarding Figure 2 It is further preferably provided that, if the first difference is greater than the second difference, a signal is generated indicating an (unwanted) gas transfer (i.e. a loss on the gas side).

Schließlich ist noch bevorzugt vorgesehen, dass, wenn der erste Differenzbetrag gleich dem zweiten Differenzbetrag ist, ein auf ein vollständig mit Gas gefülltes Membranausdehnungsgefäß hinweisendes Signal erzeugt wird. Mit anderen Worten ausgedrückt, ist ein vollständiges Fehlen an Druckschwankungen als sicherer Hinweis darauf zu verstehen, dass die sogenannte Wasservorlage aus dem Membranausdehnungsgefäß verdrängt worden ist, also der Vordruck des Membranausdehnungsgefäßes höher als der Druck der Heizungsanlage bei Erwärmung des Heizwassers ist.Finally, it is preferably provided that, if the first difference is equal to the second difference, a membrane expansion vessel completely filled with gas In other words, a complete lack of pressure fluctuations is a sure indication that the so-called water reservoir has been displaced from the diaphragm expansion vessel, i.e. the pre-pressure of the diaphragm expansion vessel is higher than the pressure of the heating system when the heating water is heated.

Claims (8)

  1. A method for operating a heating system having a diaphragm expansion vessel, in which, within individual measuring intervals, a first pressure is acquired in the heating system at a first operating temperature on the one hand, and a second pressure of the heating system is acquired at a second operating temperature on the other,
    characterized in that,
    in order to test the functionality of the heating system with its diaphragm expansion vessel, a first difference between the first and second pressure from one measuring interval is compared with a second difference between the first and second pressure from another measuring interval, and a signal is generated starting at a predetermined deviation between the differences.
  2. The method for operating a heating system having a diaphragm expansion vessel according to claim 1,
    characterized in that
    a reference mean value is formed between the first and second pressures upon initialization of the heating system, that an instantaneous mean value is formed between the first and second pressures during operation of the heating system, and that a signal is generated starting at a preset difference between the reference mean value and the instantaneous mean value.
  3. The method for operating a heating system having a diaphragm expansion vessel according to claim 1 or 2,
    characterized in that,
    during the operation of the heating system, the conclusion of one measuring interval is followed by the beginning of a next measuring interval.
  4. The method for operating a heating system having a diaphragm expansion vessel according to one of claims 1 to 3,
    characterized in that,
    if the first difference is smaller than the second difference, a signal indicating a water overflow is generated.
  5. The method for operating a heating system having a diaphragm expansion vessel according to one of claims 1 to 3,
    characterized in that,
    if the first difference is larger than the second difference, an indicating signal is generated.
  6. The method for operating a heating system having a diaphragm expansion vessel according to one of claims 1 to 3,
    characterized in that,
    if the first difference is equal to the second difference, a signal indicating a diaphragm expansion vessel completely filled with gas is generated.
  7. The method for operating a heating system having a diaphragm expansion vessel according to one of claims 1 to 6,
    characterized in that
    measurement data determined in a measuring interval are stored.
  8. The method for operating a heating system having a diaphragm expansion vessel according to one of claims 1 to 7,
    characterized in that
    the pressure of the water in the heating circuit of the heating system is measured.
EP23150526.4A 2022-01-10 2023-01-06 Method for operating a heating system comprising a membrane expansion vessel Active EP4209719B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022100365.5A DE102022100365A1 (en) 2022-01-10 2022-01-10 Method for operating a heating system having a membrane expansion vessel

Publications (2)

Publication Number Publication Date
EP4209719A1 EP4209719A1 (en) 2023-07-12
EP4209719B1 true EP4209719B1 (en) 2024-06-19

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DE (1) DE102022100365A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3618397A1 (en) 1986-05-31 1987-12-03 Winkelmann & Pannhoff Gmbh Process and apparatus for electronic water level monitoring
DE4427645C2 (en) * 1994-08-04 1996-11-28 Thienelt Martina Margot Method and device for monitoring the pressure in expansion vessels
DE10335310B3 (en) 2003-08-01 2004-11-04 Honeywell B.V. Building central heating system with monitoring of pressure and temperature of circulated liquid for monitoring function of pressure equalization vessel in heating circuit
DE102009031835A1 (en) * 2009-07-03 2011-01-05 Viessmann Werke Gmbh & Co Kg Method for detecting a defective membrane expansion vessel in a heating circuit with a burner
DE102020207057A1 (en) 2020-06-05 2021-12-09 Robert Bosch Gesellschaft mit beschränkter Haftung Method for operating a monitoring device for monitoring a heating system, monitoring device and heating system with the monitoring device

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EP4209719A1 (en) 2023-07-12
DE102022100365A1 (en) 2023-07-13

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