EP0617240B1 - Mixed boiler - Google Patents

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Publication number
EP0617240B1
EP0617240B1 EP94104393A EP94104393A EP0617240B1 EP 0617240 B1 EP0617240 B1 EP 0617240B1 EP 94104393 A EP94104393 A EP 94104393A EP 94104393 A EP94104393 A EP 94104393A EP 0617240 B1 EP0617240 B1 EP 0617240B1
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EP
European Patent Office
Prior art keywords
service water
temperature
heat exchanger
water
temperature regulator
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.)
Expired - Lifetime
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EP94104393A
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German (de)
French (fr)
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EP0617240A3 (en
EP0617240A2 (en
Inventor
Achim Burgdorf
Norbert Gaisbauer
Martin Wolter
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N.V. VAILLANT S.A.
Vaillant GmbH
Vaillant SARL
Original Assignee
Vaillant NV
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant BV
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Publication of EP0617240A2 publication Critical patent/EP0617240A2/en
Publication of EP0617240A3 publication Critical patent/EP0617240A3/en
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Publication of EP0617240B1 publication Critical patent/EP0617240B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
    • F24D19/1069—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water regulation in function of the temperature of the domestic hot water
    • 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
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F24H15/175—Supplying heated water with desired temperature or desired range of temperature where the difference between the measured temperature and a set temperature is kept under a predetermined value
    • 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
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • 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
    • F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating 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
    • 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
    • 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
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based

Definitions

  • the invention relates to a combined water heater according to the preamble of claim 1.
  • the aim of the invention is to avoid these disadvantages and to propose a water heater of the type mentioned in the introduction, in which control of the hot water temperature is possible which is essentially independent of the inlet temperature and draw-off quantity.
  • the proposed features ensure that when the process water is drawn off and the associated activation of the process water heat exchanger, the flow temperature is specified as a function of a specified process water temperature or a comparison of this temperature with the actual discharge temperature.
  • the flow temperature is regulated in the usual way, except that it is not the flow temperature value determined or determined based on the prevailing outside temperature that is used as the reference variable, but rather the one based on the desired hot water temperature or a comparison of this temperature with the actual outlet temperature of the hot water.
  • the domestic water operation starts with the opening of a nozzle.
  • the water flows from the cold water inlet through the domestic hot water heat exchanger, causing the pressure in its secondary circuit to drop, whereby the priority circuit connects the primary heat exchanger to the primary circuit of the domestic hot water heat exchanger and it leads to a circulation of the heating water via the domestic hot water. Heat exchanger is coming.
  • the hot water temperature controller transmits a value for the flow temperature, which leads to the preparation of hot water at the desired temperature, to the comparator assigned to the flow temperature controller.
  • the flow temperature setpoint can be switched using a water switch.
  • the flow temperature controller compares this target value with the actual value of the flow temperature and controls it accordingly by controlling the output of the heat source, e.g. by controlling the fuel supply to a burner.
  • the hot water temperature controller changes the flow temperature setpoint depending on the deviation of the outlet temperature of the hot water from the setpoint set on the hot water setpoint generator.
  • the proposed measures result in a cascade control, in which the control of the process water temperature is not regulated directly depending on the control deviation between the setpoint and actual value of the process water temperature, but indirectly via the subordinate flow temperature controller, which results in improved dynamic behavior.
  • the flow temperature controller can work as a purely proportional controller, which quickly regulates faults in the heating water circuit via the domestic water heat exchanger. In the case of smaller control deviations, the superimposed hot water temperature controller works as a proportional-integral controller, so that there is no stationary control deviation.
  • the process water temperature controller works as a purely proportional controller as long as it tries to set a higher flow temperature setpoint.
  • the limitation function becomes ineffective.
  • the hot water temperature controller then works as a proportional-integral controller.
  • the switchover is carried out by the comparator, which is fixed to the respective difference.
  • the water heater according to FIG. 1 has a burner 1 which can be supplied with gas via a gas control valve 2. This burner 1 acts on a primary heat exchanger 3 above which an exhaust hood 4 is arranged.
  • the primary heat exchanger 3 is connected via a flow line 5 to a heater 6, which is connected to the primary heat exchanger 3 via a return line 7, a circulation pump 8 being arranged in the return line 7.
  • a priority switching valve 9 is arranged in the flow line 5, to which a bypass line 10 is connected, which leads to the return line 7 and in which a primary circuit 12 of a process water heat exchanger 11 is arranged.
  • the secondary circuit 13 of the domestic water heat exchanger 11 is connected to a cold water inlet 14 via a water switch 15, which responds when the pressure drops. Furthermore, the secondary circuit 13 is connected to a nozzle 16.
  • a controller 17 which has a flow temperature sensor 18, a flow temperature setpoint value transmitter 19, which specifies the setpoint value as a function of the outside temperature, a process water temperature setpoint value transmitter 20, an outlet temperature sensor 26, and the water switch 15 connected on the input side.
  • the control 17 On the output side, the control 17 is connected to the gas valve 2, the circulation pump 8, the priority switching valve 9.
  • the controller 17 is shown in more detail in FIG. 2 in the form of a flow chart.
  • a flow temperature controller 21 controls the gas control valve 2 and thus the burner 1, which acts on the primary heat exchanger 3.
  • the flow temperature sensor 18 is connected to a comparator 22, the second input of which is connected to the desired flow temperature value transmitter 19 and the output of a hot water temperature controller 23.
  • the hot water temperature controller 23 is connected to the output of a comparator 24, which in turn is connected to the outlet temperature sensor 26 and the hot water temperature setpoint generator 20.
  • the hot water temperature controller 23 emits a flow temperature setpoint value signal when tapping hot water as a function of the difference between the hot water temperature setpoint set on the hot water temperature value transmitter 20 and the outlet temperature of the hot water.
  • This flow temperature setpoint value signal is processed by the flow temperature controller 21, which controls the burner 1 accordingly.
  • the hot water temperature controller 23 is also connected to a comparator 25, the two inputs of which are connected to the hot water temperature setpoint generator 20 and the output of the hot water temperature controller 23.
  • the comparator 25 switches the control characteristic of the hot water temperature controller 23 from a proportional-integral control characteristic to a proportional control characteristic when the difference between the desired flow temperature and the outlet temperature reaches a certain, value dependent on the design of the domestic water heat exchanger 11 exceeds.
  • the domestic water temperature controller 23 works as long as it tries to specify a higher desired flow temperature value than a purely proportional controller.

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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)
  • Fluid Mechanics (AREA)
  • Computer Hardware Design (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Control Of Temperature (AREA)
  • Control Of Combustion (AREA)

Description

Die Erfindung bezieht sich auf einen kombinierten Wasserheizer gemäß dem Oberbegriff des Anspruches 1.The invention relates to a combined water heater according to the preamble of claim 1.

Bei solchen, zum Beispiel aus der DE-OS 2 434 222 bekannten derartigen Wasserheizern wird im allgemeinen in der Betriebsart "Brauchwasserbereitung" das Brauchwasser indirekt vom - in dieser Betriebsart rein geräteintern fließenden - Heizwasser erwärmt. Die Vorlauftemperatur dieses Heizwassers wird dabei auf einen festen oder einstellbaren Wert geregelt. Eine solche reine Vorlauftemperaturregelung arbeitet sehr schnell und genau. Sie erfaßt jedoch nicht die echte Auslauftemperatur, die bei konstanter Vorlauftemperatur und konstantem Übertragungsverhalten des Wärmetauschers immer noch von der Brauchwassereinlauftemperatur und der Zapfmenge abhängig ist. Eine direkte Regelung der Auslauftemperatur ist wegen der Rohrlängen im Gerät und Wärmetauscher nur mit einem sehr langsamen Regler möglich. Der Vorhalt offenbart das Umschalten von einem Proportional- auf ein Proportional-Integral-Regelverhalten beim Umschalten von einer Vorlauf-(Heizungs-)Regelung auf eine Brauchwasser-Temperaturregelung.In such water heaters known from DE-OS 2 434 222, for example, in the "domestic water preparation" operating mode, the domestic water is heated indirectly by the heating water, which flows purely internally in this operating mode. The flow temperature of this heating water is regulated to a fixed or adjustable value. Such a pure flow temperature control works very quickly and precisely. However, it does not record the real outlet temperature, which is still dependent on the hot water inlet temperature and the draw-off volume at constant flow temperature and constant transfer behavior of the heat exchanger. Direct control of the outlet temperature is only possible with a very slow controller because of the pipe lengths in the device and heat exchanger. The lead discloses switching from a proportional to a proportional-integral control behavior when switching from a flow control (heating) control to a hot water temperature control.

Ziel der Erfindung ist es, diese Nachteile zu vermeiden und einen Wasserheizer der eingangs erwähnten Art vorzuschlagen, bei dem eine von der Einlauftemperatur und Zapfmenge im wesentlichen unabhängige Steuerung der Brauchwassertemperatur möglich ist.The aim of the invention is to avoid these disadvantages and to propose a water heater of the type mentioned in the introduction, in which control of the hot water temperature is possible which is essentially independent of the inlet temperature and draw-off quantity.

Erfindungsgemäß wird dies bei einem Wasserheizer der eingangs erwähnten Art durch die kennzeichnenden Merkmale des Anspruches 1 erreicht.According to the invention this is achieved in a water heater of the type mentioned by the characterizing features of claim 1.

Durch die vorgeschlagenen Merkmale ist sichergestellt, daß beim Zapfen von Brauchwasser und der damit verbundenen Aktivierung des Brauchwasser-Wärmetauschers eine Vorgabe der Vorlauftemperatur in Abhängigkeit von einer vorgegebenen Brauchwasser-Soll-Temperatur bzw. einem Vergleich dieser Temperatur mit der tatsächlichen Auslauftemperatur erfolgt. Die Regelung der Vorlauftemperatur erfolgt dabei in üblicher Weise, nur, daß eben nicht der aufgrund der herrschenden Außentemperatur ermittelte oder ein fest eingestellter Vorlauftemperaturwert als Führungsgröße dient, sondern ein aufgrund der gewünschten Brauchwassertemperatur bzw. eines Vergleichs dieser Temperatur mit der tatsächlichen Auslauftemperatur des Brauchwassers.The proposed features ensure that when the process water is drawn off and the associated activation of the process water heat exchanger, the flow temperature is specified as a function of a specified process water temperature or a comparison of this temperature with the actual discharge temperature. The flow temperature is regulated in the usual way, except that it is not the flow temperature value determined or determined based on the prevailing outside temperature that is used as the reference variable, but rather the one based on the desired hot water temperature or a comparison of this temperature with the actual outlet temperature of the hot water.

Der Brauchwasserbetrieb beginnt mit dem Öffnen eines Zapfventiles. Das Wasser fließt vom Kaltwasser-Einlauf durch den Brauchwasser-Wärmetauscher wodurch es in dessen Sekundärkreis zu einem Absinken des Druckes kommt, wodurch die Vorrangschaltung den Primär-Wärmetauscher mit dem Primärkreis des Brauchwasser-Wärmetauschers verbindet und es zu einem Kreislauf des Heizwassers über den Brauchwasser-Wärmetauscher kommt.The domestic water operation starts with the opening of a nozzle. The water flows from the cold water inlet through the domestic hot water heat exchanger, causing the pressure in its secondary circuit to drop, whereby the priority circuit connects the primary heat exchanger to the primary circuit of the domestic hot water heat exchanger and it leads to a circulation of the heating water via the domestic hot water. Heat exchanger is coming.

Der Brauchwassertemperaturregler gibt im Brauchwasserbetrieb einen Wert für die Vorlauftemperatur, der zur Bereitung von Brauchwasser mit der gewünschten Temperatur führt, an den dem Vorlauftemperaturregler zugeordneten Vergleicher weiter. Dabei kann mittels eines Wasserschalters der Vorlauftemperatur-Soll-Wert umgeschaltet werden.The hot water temperature controller transmits a value for the flow temperature, which leads to the preparation of hot water at the desired temperature, to the comparator assigned to the flow temperature controller. The flow temperature setpoint can be switched using a water switch.

Der Vorlauftemperaturregler vergleicht diesen Soll-Wert mit dem Ist-Wert der Vorlauftemperatur und regelt diese entsprechend durch Steuerung der Leistung der Wärmequelle, z.B. durch Steuerung der Brennstoffzufuhr zu einem Brenner.The flow temperature controller compares this target value with the actual value of the flow temperature and controls it accordingly by controlling the output of the heat source, e.g. by controlling the fuel supply to a burner.

Der Brauchwassertemperaturregler verändert den Vorlauftemperatur-Soll-Wert in Abhängigkeit von der Abweichung der Auslauftemperatur des Brauchwassers vom am Brauchwasser-Soll-Wertgeber eingestellten Soll-Wert.The hot water temperature controller changes the flow temperature setpoint depending on the deviation of the outlet temperature of the hot water from the setpoint set on the hot water setpoint generator.

Es ergibt sich durch die vorgeschlagenen Maßnahmen eine Kaskadenregelung, bei der die Regelung der Brauchwassertemperatur nicht direkt in Abhängigkeit von der Regelabweichung zwischen dem Soll- und Ist-Wert der Brauchwassertemperatur geregelt wird sondern indirekt über den unterlagerten Vorlauftemperaturregler, wodurch sich ein verbessertes dynamisches Verhalten ergibt. Der Vorlauftemperaturregler kann dabei als reiner Proportionalregler arbeiten, der Störungen im über den Brauchwasser-Wärmetauscher geführten Heizwasserkreislauf sehr schnell ausregelt. Der überlagerte Brauchwassertemperaturregler arbeitet bei kleineren Regelabweichungen als Proportional-lntegral-Regler, so daß keine stationäre Regelabweichung bleibt.The proposed measures result in a cascade control, in which the control of the process water temperature is not regulated directly depending on the control deviation between the setpoint and actual value of the process water temperature, but indirectly via the subordinate flow temperature controller, which results in improved dynamic behavior. The flow temperature controller can work as a purely proportional controller, which quickly regulates faults in the heating water circuit via the domestic water heat exchanger. In the case of smaller control deviations, the superimposed hot water temperature controller works as a proportional-integral controller, so that there is no stationary control deviation.

So ist es möglich die Differenz zwischen der eingestellten Brauchwasser-Soll-Temperatur und der vom Brauchwassertemperaturregler abgegebenen Vorlauftemperatur-Soll-Wertgeber auf eine maximal am Brauchwasser-Wärmetauscher auftretende Differenz zwischen der Vorlauftemperatur und der Auslauftemperatur, welche Differenz von der Bauart des Brauchwasser-Wärmetauschers bestimmt ist und z.B. 20°K beträgt, zu begrenzen. Dadurch arbeitet der Brauchwassertemperaturregler, solange er versucht, einen höheren Vorlauftemperatur-Soll-Wert vorzugeben, wie ein reiner Proportionalregler.It is thus possible to make the difference between the set target hot water temperature and the flow temperature target value transmitter output by the hot water temperature controller, based on a maximum difference between the flow temperature and the outlet temperature occurring at the hot water heat exchanger, which difference determines the design of the hot water heat exchanger is and e.g. Limit is 20 ° K. As a result, the process water temperature controller works as a purely proportional controller as long as it tries to set a higher flow temperature setpoint.

Hat sich die Auslauftemperatur dem Soll-Wert soweit angenähert, daß der Vorlauftemperatur-Soll-Wert um weniger als die oben beschriebene Differenz über dem Brauchwassertemperatur-Soll-Wert liegen soll, so wird die Begrenzungsfunktion unwirksam. Der Brauchwassertemperaturregler arbeitet dann als Proportional-lntegral-Regler.If the outlet temperature has approached the setpoint to such an extent that the setpoint for the supply temperature should be less than the above-described difference above the setpoint for the dhw temperature, the limitation function becomes ineffective. The hot water temperature controller then works as a proportional-integral controller.

Die Umschaltung erfolgt dabei durch den Vergleicher, der auf die jeweilige Differenz fest eingestellt ist.The switchover is carried out by the comparator, which is fixed to the respective difference.

Die Umschaltung der Regelcharakteristik des Brauchwassertemperaturreglers führt zu geringerem Überschwingen und kürzeren Einschwingzeiten beim Zapfbeginn und bei sprunghaften Soll-Wert-änderungen, als bei konstantem Proportional-lntegral-Verhalten erreichbar wäre.Switching the control characteristics of the hot water temperature controller leads to less overshoot and shorter settling times at the start of the tap and in the event of sudden setpoint value changes than would be achievable with constant proportional-integral behavior.

Die Erfindung wird nun anhand der Zeichnung näher erläutert. Dabei zeigen:

  • Fig. 1 schematisch einen erfindungsgemäßen Wasserheizer und
  • Fig. 2 ein Blockschaltbild der Regelung des Wasserheizers nach der Fig. 1.
  • Gleiche Bezugszeichen bedeuten in beiden Figuren gleiche Einzelheiten.
The invention will now be explained in more detail with reference to the drawing. Show:
  • Fig. 1 shows schematically a water heater according to the invention and
  • FIG. 2 is a block diagram of the control of the water heater according to FIG. 1.
  • The same reference numerals mean the same details in both figures.

Der Wasserheizer nach der Fig. 1 weist einen Brenner 1 auf, der über ein Gasregelventil 2 mit Gas versorgbar ist. Dieser Brenner 1 beaufschlagt einen Primär-Wärmetauscher 3 über dem eine Abgashaube 4 angeordnet ist.The water heater according to FIG. 1 has a burner 1 which can be supplied with gas via a gas control valve 2. This burner 1 acts on a primary heat exchanger 3 above which an exhaust hood 4 is arranged.

Der Primär-Wärmetauscher 3 ist über eine Vorlaufleitung 5 mit einer Heizung 6 verbunden, die über eine Rücklaufleitung 7 mit dem Primär-Wärmetauscher 3 verbunden ist, wobei in der Rücklaufleitung 7 eine Umwälzpumpe 8 angeordnet ist.The primary heat exchanger 3 is connected via a flow line 5 to a heater 6, which is connected to the primary heat exchanger 3 via a return line 7, a circulation pump 8 being arranged in the return line 7.

In der Vorlaufleitung 5 ist ein Vorrangschaltventil 9 angeordnet, an dem eine Bypassleitung 10 angeschlossen ist, die zur Rücklaufleitung 7 führt und in der ein Primärkreis 12 eines Brauchwasser-Wärmetauschers 11 angeordnet ist.A priority switching valve 9 is arranged in the flow line 5, to which a bypass line 10 is connected, which leads to the return line 7 and in which a primary circuit 12 of a process water heat exchanger 11 is arranged.

Der Sekundärkreis 13 des Brauchwasser-Wärmetauschers 11 ist mit einem Kaltwassereinlaß 14 über einen Wasserschalter 15 verbunden, der bei einem Absinken des Druckes anspricht. Weiters ist der Sekundärkreis 13 mit einem Zapfventil 16 verbunden.The secondary circuit 13 of the domestic water heat exchanger 11 is connected to a cold water inlet 14 via a water switch 15, which responds when the pressure drops. Furthermore, the secondary circuit 13 is connected to a nozzle 16.

Weiters ist eine Steuerung 17 vorgesehen, die mit einem Vorlauftemperaturfühler 18, einem Vorlauftemperatur-Soll-Wertgeber 19, der den Soll-Wert in Abhängigkeit von der Außentemperatur vorgibt, einem Brauchwassertemperatur-Soll-Wertgeber 20, einem Auslauf-Temperaturfühler 26, sowie dem Wasserschalter 15 eingangsseitig verbunden. Ausgangsseitig ist die Steuerung 17 mit dem Gasventil 2, der Umlaufpumpe 8, dem Vorrangschaltventil 9 verbunden.Furthermore, a controller 17 is provided, which has a flow temperature sensor 18, a flow temperature setpoint value transmitter 19, which specifies the setpoint value as a function of the outside temperature, a process water temperature setpoint value transmitter 20, an outlet temperature sensor 26, and the water switch 15 connected on the input side. On the output side, the control 17 is connected to the gas valve 2, the circulation pump 8, the priority switching valve 9.

Die Steuerung 17 ist in der Fig. 2 in Form eines Flußdiagrammes näher dargestellt.The controller 17 is shown in more detail in FIG. 2 in the form of a flow chart.

Ein Vorlauftemperatur-Regler 21 steuert das Gasregelventil 2 und damit den Brenner 1, der den Primär-Wärmetauscher 3 beaufschlagt. Der Vorlauftemperaturfühler 18 ist mit einem Vergleicher 22 verbunden, dessen zweiter Eingang mit dem Vorlauftemperatur-Soll-Wertgeber 19 und dem Ausgang eines Brauchwassertemperaturreglers 23 verbunden ist.A flow temperature controller 21 controls the gas control valve 2 and thus the burner 1, which acts on the primary heat exchanger 3. The flow temperature sensor 18 is connected to a comparator 22, the second input of which is connected to the desired flow temperature value transmitter 19 and the output of a hot water temperature controller 23.

Der Brauchwassertemperaturregler 23 ist mit dem Ausgang eines Vergleichers 24 verbunden, der seinerseits mit dem Auslauftemperatur-Fühler 26 und dem Brauchwassertemperatur-Soll-Wertgeber 20 verbunden ist. Dabei gibt der Brauchwassertemperaturregler 23 beim Zapfen von Brauchwasser ein Vorlauftemperatur-Soll-Wert-Signal in Abhängigkeit von der Differenz zwischen der am Brauchwassertemperatur-Soll-Wertgeber 20 eingestellten Brauchwasser-Soll-Temperatur und der Auslauftemperatur des Brauchwassers ab. Dieses Vorlauftemperatur-Soll-Wert-Signal wird vom Vorlauftemperaturregler 21 verarbeitet, der den Brenner 1 entsprechend steuert.The hot water temperature controller 23 is connected to the output of a comparator 24, which in turn is connected to the outlet temperature sensor 26 and the hot water temperature setpoint generator 20. The hot water temperature controller 23 emits a flow temperature setpoint value signal when tapping hot water as a function of the difference between the hot water temperature setpoint set on the hot water temperature value transmitter 20 and the outlet temperature of the hot water. This flow temperature setpoint value signal is processed by the flow temperature controller 21, which controls the burner 1 accordingly.

Der Brauchwassertemperaturregler 23 ist weiters mit einem Vergleicher 25 verbunden, dessen beide Eingänge mit dem Brauchwassertemperatur-Soll-Wertgeber 20 und dem Ausgang des Brauchwassertemperaturreglers 23 verbunden sind. Dabei schaltet der Vergleicher 25 die Regelcharakteristik des Brauchwassertemperaturreglers 23 von einer Proportional-Integral-Regelcharakteristik auf eine Proportional-Regelcharakteristik um, wenn die Differenz zwischen der Vorlauf-Soll-Temperatur und der Auslauftemperatur einen bestimmten, von der Bauart des Brauchwasser-Wärmetauschers 11 abhängigen Wert übersteigt. Dadurch arbeitet der Brauchwassertemperaturregler 23, solange er versucht einen höheren Vorlauftemperatur-Soll-Wert vorzugeben wie ein reiner Proportional-Regler.The hot water temperature controller 23 is also connected to a comparator 25, the two inputs of which are connected to the hot water temperature setpoint generator 20 and the output of the hot water temperature controller 23. The comparator 25 switches the control characteristic of the hot water temperature controller 23 from a proportional-integral control characteristic to a proportional control characteristic when the difference between the desired flow temperature and the outlet temperature reaches a certain, value dependent on the design of the domestic water heat exchanger 11 exceeds. As a result, the domestic water temperature controller 23 works as long as it tries to specify a higher desired flow temperature value than a purely proportional controller.

Durch die Umschaltung der Regelcharakteristik des Brauchwassertemperaturreglers 23 ergibt sich ein nur sehr geringes Überschwingen des Reglers und kürzere Einschwingzeiten beim Zapfbeginn und bei sprunghaften Soll-Wert-Änderungen, als bei einem konstanten Proportional-Integral-Regelverhalten des Brauchwassertemperaturreglers 23.Switching over the control characteristic of the hot water temperature controller 23 results in only a very slight overshoot of the controller and shorter settling times at the start of tapping and in the event of sudden setpoint value changes than with a constant proportional-integral control behavior of the hot water temperature controller 23.

Claims (1)

  1. Combined water heater for service and heating water, comprising a primary heat exchanger supplied from a heat source, such heat exchanger being alternatively connectable with a heating system or a service water heat exchanger via a priority control valve controlled by a tapping valve, and further comprising an upstream temperature regulator associated with a comparator device connected with an upstream temperature setpoint generator and an upstream temperature sensor, operating in such a way that, if the service water heat exchanger (11) is activated, the input connected with the upstream temperature setpoint generator (19) of the comparator device (22) associated with the upstream temperature regulator (21) receives the output signal of a service water temperature regulator (23), whose input side is connected with a comparator device (24) whose inputs, in turn, are connected with a service water discharge temperature sensor (26) and a service water setpoint generator (20), characterized in that the output of the service water temperature regulator (23) is connected with a comparator device (25) whose second input is connected with the service water setpoint generator (20), with this comparator device (25) operating to control a switching function depending on the difference between the output signal of the service water temperature regulator (23) and the service water setpoint temperature, such switching function acting in such a way that the regulating characteristic of the service water temperature regulator (23) is switched over from a proportional regulating characteristic to a proportional integral regulating characteristic when the regulating deviation falls short of a certain preset difference, and vice versa.
EP94104393A 1993-03-22 1994-03-21 Mixed boiler Expired - Lifetime EP0617240B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9304220 1993-03-22
DE9304220U 1993-03-22

Publications (3)

Publication Number Publication Date
EP0617240A2 EP0617240A2 (en) 1994-09-28
EP0617240A3 EP0617240A3 (en) 1994-11-23
EP0617240B1 true EP0617240B1 (en) 1997-10-29

Family

ID=6890976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94104393A Expired - Lifetime EP0617240B1 (en) 1993-03-22 1994-03-21 Mixed boiler

Country Status (2)

Country Link
EP (1) EP0617240B1 (en)
DE (2) DE59404448D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0953808A3 (en) * 1998-05-02 2001-08-22 WILO GmbH Hydraulic unit with a pressure sensor for a combined heating installation for heating water and sanitary water

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412907B (en) * 2000-02-02 2005-08-25 Vaillant Gmbh PASS WATER HEATER
WO2020084813A1 (en) * 2018-10-25 2020-04-30 株式会社ノーリツ Heating and hot-water supply device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0953808A3 (en) * 1998-05-02 2001-08-22 WILO GmbH Hydraulic unit with a pressure sensor for a combined heating installation for heating water and sanitary water

Also Published As

Publication number Publication date
DE59404448D1 (en) 1997-12-04
EP0617240A3 (en) 1994-11-23
DE4409855A1 (en) 1994-09-29
EP0617240A2 (en) 1994-09-28

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