EP1148302B1 - Method for regulating the tapping temperature of sanitary water - Google Patents

Method for regulating the tapping temperature of sanitary water Download PDF

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Publication number
EP1148302B1
EP1148302B1 EP01890113A EP01890113A EP1148302B1 EP 1148302 B1 EP1148302 B1 EP 1148302B1 EP 01890113 A EP01890113 A EP 01890113A EP 01890113 A EP01890113 A EP 01890113A EP 1148302 B1 EP1148302 B1 EP 1148302B1
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EP
European Patent Office
Prior art keywords
temperature
heat exchanger
speed
regulating
pump
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EP01890113A
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German (de)
French (fr)
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EP1148302A3 (en
EP1148302A2 (en
Inventor
Kurt Fichtenbauer
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Technische Alternative Elektronische Steuerungsgerategesellschaft Mbh
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Technische Alternative Elektronische Steuerungsgerategesellschaft Mbh
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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
    • F24H15/20—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
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/254—Room temperature
    • 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
    • F24H15/258—Outdoor temperature
    • 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
    • F24H15/345—Control of fans, e.g. on-off control
    • F24H15/35—Control of the speed of fans

Definitions

  • the invention relates to a method for controlling the discharge temperature of secondary side in a heat exchanger heated process water, which heat exchanger on the primary side in a via a heat source, in particular a buffer memory, leading, equipped with a controllable in their speed circulation pump heating circuit is integrated, after a PID Controller controls the pump drive as a function of the comparison of the measured secondary-side outlet temperature of the heat exchanger as an actual value with a predetermined setpoint.
  • a heat exchanger for domestic hot water production, it is known to heat the service water on the secondary side via a heat exchanger in the water heater principle, which heat exchanger through a primary circuit with circulation pump and heat source, for example, a filled with hot water heater buffer heat-treated, the energy input into the heat exchanger from the primary-side flow rate and thus depends on the speed of the circulating pump.
  • the hot water outlet temperature is measured at the heat exchanger as an actual value and compared via a PID controller (proportional-integral differential controller) with the desired setpoint and accordingly controls the circulation pump in their speed.
  • PID controller proportional-integral differential controller
  • the controllers have a certain dynamics and therefore the pump speed only in one Limited range may vary properly, especially at the lower speed range, a sensitive overreaction in the control would come about, so far the pump drive control is continuously not possible from zero to the rated speed. It is necessary to recognize a secondary-side flow, so a hot water extraction, including flow switch, differential pressure gauge, water meters u. Like. Serve, and turn off the circulation pump in the primary circuit, as long as there is no secondary flow and turn on only when such a flow occurs, so utility water is removed. If the circulation pump is switched on, then the control of the pump drive takes place in a speed range of approximately 30 to 100% of the rated speed in order to influence the energy input into the heat exchanger for producing domestic hot water.
  • the invention is therefore an object of the invention to provide a method of the type described, which allows a rational way a reliable and sensitive rules of the discharge temperature of hot water.
  • the invention solves this problem in that the PID controller is equipped with a regulator level for the speed zero and the pump drive over the entire speed range is controlled only in response to the actual setpoint comparison, in the case of speed zero and a detectable temperature gradient of the outlet temperature of I-part of the PID controller is reset to its basic position.
  • An electronic PID controller comprises three control parts, the proportional part for amplifying the difference between the actual and the setpoint, the integral part for compensating the deviation remaining by the proportional part and the differential part for influencing the reaction of the control output as a function of the slope of the gradient of the actual value.
  • the integral part compensates in the long term for the proportional part remaining control errors and the differential part leads to a rapid change of the actual value to an overreaction of the controller in order to accelerate the control effect.
  • the proportional part for amplifying the difference between the actual and the setpoint
  • the integral part for compensating the deviation remaining by the proportional part
  • the differential part for influencing the reaction of the control output as a function of the slope of the gradient of the actual value.
  • the detection of a secondary flow in the heat exchanger is dispensed with and the zero speed control stage introduced at the controller, so that due to the always measured secondary outlet temperature of the heat exchanger is a constant standby effort for domestic hot water delivery and also ensures a constant maintenance of the outlet temperature.
  • the outlet temperature on the heat exchanger on the secondary side rises above the setpoint, whereby the controller reduces the pump speed. Since, however, without dhw extraction an increase of the actual value remains, the pump drive is finally driven to zero speed and stopped the circulation pump.
  • the controller will increase the pump speed according to the actual setpoint comparison again until the predetermined temperature is reached, which again leads to a certain increase in the outlet temperature in succession the finite heat transfer rate and the inertia of the temperature measurement leads.
  • the exaggeration of the outlet temperature, ie the actual value, during the standby state recognizes a PID controller as a control deviation, which fully exploits the integral part, so that the integral part due to the non-possible reduction of the speed below the speed level zero, its negative value to the maximum lowers.
  • the controller output can also be switched off when the actual temperature exceeds a setpoint value which is higher than the setpoint value, with the temperature preferably being about 1-3 ° C. above the setpoint value.
  • the actual value rises only slowly because of the then lack of flow, whereby the pump speed only slowly approaches zero and it in the heating circuit to a pumping back hot storage medium in the buffer memory and thus to a mixing of the lower cold storage medium with the hot storage medium , So a deletion in the buffer memory would come. This is avoided by switching off the controller output and thus switching off the circulating pump, wherein falling below the temperature threshold by the actual value again leads to switching on the controller or the pump.
  • the control behavior can be improved as a result of the lower controller and pump dynamics.
  • the calcification risk can be due to lower temperatures in the heat exchanger.
  • a domestic hot water system 1 comprises a heating circuit 2 with a buffer memory 3 and a controllable in their speed circulation pump 4 and a service water circuit 5 with a service water inlet 6 and a service water outlet 7, a heat exchanger 8 is primary side in the heating circuit 2 and secondary side integrated in the hot water circuit 5 and if necessary, hot water heated in a water heater principle.
  • a PID controller 9 which controls the pump drive 10 as a function of the comparison of the secondary outlet temperature of the heat exchanger 8 as an actual value with a predetermined setpoint.
  • a temperature sensor 11 in the outlet region of the process water drain from the heat exchanger 8 reads the corresponding temperature values into the controller 9.
  • the pump drive 10 is controlled over the entire speed range of speed level zero to the rated speed without detection of a flow through the hot water circuit 5 from the controller 9, so that both a standby state in the heat exchanger 8 results as well as keep the discharge temperature of the service water within narrow limits constant wherein to eliminate the regulator inertia due to the saturation drift of the integral part of this integral part at zero speed and at a certain temperature gradient of the outlet temperature is returned to the normal position.
  • a thermal mixer 12 may be installed with the buffer 3 bridging bypass line 13 in the heating circuit 2, so that the primary-side inlet temperature of the heat exchanger 8 is limited to a certain maximum value.

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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)
  • Control Of Temperature (AREA)
  • Control For Baths (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Control Of Combustion (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Regeln der Entnahmetemperatur von sekundärseitig in einem Wärmetauscher erwärmtem Brauchwasser, welcher Wärmetauscher primärseitig in einem über eine Wärmequelle, insbesondere einen Pufferspeicher, führenden, mit einer in ihrer Drehzahl steuerbaren Umwälzpumpe ausgestatteten Heizkreis eingebunden ist, nach dem ein PID-Regler den Pumpenantrieb in Abhängigkeit vom Vergleich der gemessenen sekundärseitigen Austrittstemperatur des Wärmetauschers als Istwert mit einem vorgegebenen Sollwert ansteuert.The invention relates to a method for controlling the discharge temperature of secondary side in a heat exchanger heated process water, which heat exchanger on the primary side in a via a heat source, in particular a buffer memory, leading, equipped with a controllable in their speed circulation pump heating circuit is integrated, after a PID Controller controls the pump drive as a function of the comparison of the measured secondary-side outlet temperature of the heat exchanger as an actual value with a predetermined setpoint.

Zur Brauchwarmwassererzeugung ist es bekannt, das Brauchwasser sekundärseitig über einen Wärmetauscher im Durchlauferhitzerprinzip zu erwärmen, welcher Wärmetauscher durch einen Primärkreis mit Umwälzpumpe und Wärmequelle, beispielsweise einem mit heißem Heizungswasser befüllten Pufferspeicher, wärmebeaufschlagt wird, wobei der Energieeintrag in den Wärmetauscher von der primärseitigen Durchflußmenge und damit von der Drehzahl der Umwälzpumpe abhängt. Zur Regelung bzw. Konstanthaltung der Brauchwassertemperatur wird die Brauchwasseraustrittstemperatur am Wärmetauscher als Istwert gemessen und über einen PID-Regler (Proportional-Integral-Differentialregler) mit dem gewünschten Sollwert verglichen und dementsprechend die Umwälzpumpe in ihrer Drehzahl gesteuert. Da die Regler eine bestimmte Dynamik besitzen und demnach die Pumpendrehzahl nur in einem begrenzten Bereich ordnungsgemäß variieren können, wobei vor allem im unteren Drehzahlbereich eine empfindliche Überreaktion bei der Regelung zustande käme, ist bisher die Pumpenantriebssteuerung durchgehend von Null bis zur Nenndrehzahl nicht möglich. Es ist notwendig, einen sekundärseitigen Durchfluß, also eine Warmwasserentnahme zu erkennen, wozu Strömungsschalter, Differenzdruckmesser, Wasseruhren u. dgl. dienen, und die Umwälzpumpe im Primärkreis abzuschalten, so lange es keinen sekundärseitigen Durchfluß gibt und erst dann einzuschalten, wenn ein solcher Durchfluß auftritt, also Brauchwasser entnommen wird. Ist die Umwälzpumpe eingeschaltet, erfolgt dann die Regelung des Pumpenantriebes in einem Drehzahlbereich von ca. 30 bis 100 % der Nenndrehzahl, um den Energieeintrag in den Wärmetauscher zur Brauchwarmwassererzeugung zu beeinflussen. Dieses Verfahren bringt allerdings nur eine geringe Regelgenauigkeit mit sich, reagiert langsam auf sekundärseitige Durchflußmengenänderungen und führt zu einem hohen Rücklauf in den Pufferspeicher mit der Gefahr von Durchmischungen innerhalb des Speichers. Zur Erklärung wird bemerkt, daß große Volumenstromänderungen, wie sie bei einer Erhöhung der Drehzahl aus dem Abschaltzustand auf mindestens 30 % der Nenndrehzahl auftreten, wegen der thermischen Trägheit der Komponenten eine Thermostatfunktion mit hoher Hysterese ergeben. Bei einem entsprechenden Einschalten der Pumpe aufgrund der Wärmeverluste durch die Isolierung wird rasch ein hohes Temperaturniveau im Wärmetauscher erreicht. Es ergeben sich dadurch erhöhte Bereitschaftsverluste und es dauert einige Zeit bis das Energieniveau im Wärmetauscher unter die Solltemperatur gesunken ist, wonach wieder wegen der Systemträgheit eine "Temperaturlücke", also eine Wasserabgabe unter der Solltemperatur auftritt. Nach einer "Einseifpause" bei Handwasch- und Badeeinrichtungen kann anderseits wieder eine Übertemperatur im abgegebenen Brauchwasser, die sogar mit einer Verbrühungsgefahr verbunden ist, auftreten. Dazu kommt noch der Aufwand für die Durchflußerkennung sowie die Störanfälligkeit der entsprechenden Einrichtungen und Geräte und deren Ansprechträgheit.For domestic hot water production, it is known to heat the service water on the secondary side via a heat exchanger in the water heater principle, which heat exchanger through a primary circuit with circulation pump and heat source, for example, a filled with hot water heater buffer heat-treated, the energy input into the heat exchanger from the primary-side flow rate and thus depends on the speed of the circulating pump. To control or keep constant the hot water temperature, the hot water outlet temperature is measured at the heat exchanger as an actual value and compared via a PID controller (proportional-integral differential controller) with the desired setpoint and accordingly controls the circulation pump in their speed. Since the controllers have a certain dynamics and therefore the pump speed only in one Limited range may vary properly, especially at the lower speed range, a sensitive overreaction in the control would come about, so far the pump drive control is continuously not possible from zero to the rated speed. It is necessary to recognize a secondary-side flow, so a hot water extraction, including flow switch, differential pressure gauge, water meters u. Like. Serve, and turn off the circulation pump in the primary circuit, as long as there is no secondary flow and turn on only when such a flow occurs, so utility water is removed. If the circulation pump is switched on, then the control of the pump drive takes place in a speed range of approximately 30 to 100% of the rated speed in order to influence the energy input into the heat exchanger for producing domestic hot water. However, this method brings only a low control accuracy with it, reacts slowly to secondary flow rate changes and leads to a high return to the buffer memory with the risk of mixing within the memory. By way of explanation, it will be appreciated that large volumetric flow changes, such as occur with an increase in speed from off to at least 30% of rated speed, provide a high hysteresis thermostat function because of the thermal inertia of the components. When the pump is switched on as a result of the heat losses through the insulation, a high temperature level is rapidly reached in the heat exchanger. This results in increased standby losses and it takes some time until the energy level in the heat exchanger has dropped below the setpoint temperature, after which again a "temperature gap", ie a water discharge below the setpoint temperature, occurs because of the system inertia. After a "Einseifpause" at Handwasch- and bathing facilities on the other hand, an excess temperature in the dispensed hot water, which is even connected with a scalding hazard occur. In addition there is the expense of flow detection and the susceptibility of the corresponding devices and devices and their Ansprechträgheit.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs geschilderten Art anzugeben, das auf rationelle Weise ein funktionssicheres und feinfühliges Regeln der Entnahmetemperatur von Brauchwasser erlaubt.The invention is therefore an object of the invention to provide a method of the type described, which allows a rational way a reliable and sensitive rules of the discharge temperature of hot water.

Die Erfindung löst diese Aufgabe dadurch, daß der PID-Regler mit einer Reglerstufe für die Drehzahl Null ausgestattet und der Pumpenantrieb über den gesamten Drehzahlbereich nur in Abhängigkeit vom Ist-Sollwertvergleich angesteuert wird, wobei im Falle der Drehzahlstufe Null und eines erkennbaren Temperaturgradienten der Austrittstemperatur der I-Teil des PID-Reglers in seine Grundstellung zurückversetzt wird.The invention solves this problem in that the PID controller is equipped with a regulator level for the speed zero and the pump drive over the entire speed range is controlled only in response to the actual setpoint comparison, in the case of speed zero and a detectable temperature gradient of the outlet temperature of I-part of the PID controller is reset to its basic position.

Ein elektronischer PID-Regler umfaßt drei Regelteile, den Proportionalteil zur Verstärkung der Differenz zwischen Ist- und Sollwert, den Integralteil zum Ausgleichen der durch den Proportionalteil bleibenden Regelabweichung und den Differentialteil zur Beeinflussung der Reaktion des Reglerausganges in Abhängigkeit von der Steilheit des Gradienten des Istwertes. Dadurch gleicht der Integralteil langfristig die vom Proportionalteil bleibenden Regelabweichungen aus und der Differentialteil führt bei einer raschen Änderung des Istwertes zu einer Überreaktion des Reglers, um die Regelwirkung zu beschleunigen. In der Praxis wird unter einem Heranregeln an die Drehzahlstufe Null auch eine Regelung bis z. B. 5 % der Nenndrehzahl verstanden.An electronic PID controller comprises three control parts, the proportional part for amplifying the difference between the actual and the setpoint, the integral part for compensating the deviation remaining by the proportional part and the differential part for influencing the reaction of the control output as a function of the slope of the gradient of the actual value. As a result, the integral part compensates in the long term for the proportional part remaining control errors and the differential part leads to a rapid change of the actual value to an overreaction of the controller in order to accelerate the control effect. In practice, under a Heranregeln to the speed level zero and a regulation to z. B. 5% of the rated speed understood.

Erfindungsgemäß wird auf die Erkennung eines sekundärseitigen Durchflusses im Wärmetauscher verzichtet und dafür beim Regler die Drehzahlstufe Null eingeführt, so daß aufgrund der immer gemessenen sekundärseitigen Austrittstemperatur des Wärmetauschers ein ständiger Bereitschaftsaufwand zur Brauchwarmwasserabgabe besteht und zudem für eine Konstanthaltung der Austrittstemperatur gesorgt ist. Nach der Beendigung einer Warmwasserentnahme wird sekundärseitig die Austrittstemperatur am Wärmetauscher über den Sollwert steigen, wodurch der Regler die Pumpendrehzahl vermindert. Da aber ohne Brauchwasserentnahme eine Überhöhung des Istwertes bestehen bleibt, wird der Pumpenantrieb schließlich bis zur Drehzahlstufe Null angesteuert und die Umwälzpumpe stillgesetzt. Sinkt die Austrittstemperatur aufgrund von Wärmeverlusten, wird der Regler die Pumpendrehzahl entsprechend dem Ist-Sollwertvergleich wieder erhöhen, bis die vorgegebene Temperatur erreicht ist, was neuerlich zu einer gewissen Überhöhung der Austrittstemperatur in Folge der endlichen Wärmeübertragungsgeschwindigkeit und der Trägheit der Temperaturmessung führt. Die Überhöhung der Austrittstemperatur, also des Istwertes, während des Bereitschaftszustandes erkennt ein PID-Regler als Regelabweichung, die den Integralteil voll ausnützt, so daß der Integralteil wegen der nicht möglichen Reduzierung der Drehzahl unter die Drehzahlstufe Null, seinen negativen Wert bis zum Maximum absenkt. Wird dann Brauchwasser entnommen, kommt es zwar rasch zu einem Absinken der Austrittstemperatur unter den Sollwert, aber da der Integralteil einen tiefen negativen Wert aufweist, würde trotz des hohen Differentialteils der Istwert dem Sollwert nur sehr langsam angeglichen werden. Um dies zu vermeiden, wird daher bei Auftreten eines entsprechenden Gradienten der Austrittstemperatur der Integralteil in seine Grundstellung zurückversetzt, wodurch die vom Regler zum Wiederereichen des Normalzustandes benötigte Zeit wegfällt. Ein rasches Ausregeln ist daher bei Brauchwasserentnahme gewährleistet.According to the invention, the detection of a secondary flow in the heat exchanger is dispensed with and the zero speed control stage introduced at the controller, so that due to the always measured secondary outlet temperature of the heat exchanger is a constant standby effort for domestic hot water delivery and also ensures a constant maintenance of the outlet temperature. After completion of a hot water withdrawal, the outlet temperature on the heat exchanger on the secondary side rises above the setpoint, whereby the controller reduces the pump speed. Since, however, without dhw extraction an increase of the actual value remains, the pump drive is finally driven to zero speed and stopped the circulation pump. If the outlet temperature drops due to heat losses, the controller will increase the pump speed according to the actual setpoint comparison again until the predetermined temperature is reached, which again leads to a certain increase in the outlet temperature in succession the finite heat transfer rate and the inertia of the temperature measurement leads. The exaggeration of the outlet temperature, ie the actual value, during the standby state recognizes a PID controller as a control deviation, which fully exploits the integral part, so that the integral part due to the non-possible reduction of the speed below the speed level zero, its negative value to the maximum lowers. If hot water is then removed, the exit temperature drops rapidly below the setpoint value, but since the integral part has a low negative value, the actual value would only be adjusted very slowly to the setpoint value, despite the high differential part. In order to avoid this, therefore, when a corresponding gradient of the outlet temperature of the integral part is set back to its normal position, whereby the time required by the controller to reestablish the normal state is eliminated. A quick balancing is therefore guaranteed at service water.

Erfindungsgemäß kann außerdem der Reglerausgang bei Überschreiten einer dem Sollwert gegenüber erhöhten Temperaturschwelle durch den Istwert abgeschaltet werden, wobei vorzugsweise die Temperatur etwa 1-3 °C über dem Sollwert liegt. Am Ende einer Warmwasserentnahme steigt der Istwert wegen des dann fehlenden Durchflusses nur langsam an, wodurch auch die Pumpendrehzahl nur langsam gegen Null geht und es im Heizkreis zu einem Rückpumpen heißen Speichermediums in den Pufferspeicher und damit zu einem Vermischen des unteren kalten Speichermediums mit dem heißen Speichermedium, also einer Entschichtung im Pufferspeicher käme. Dies wird durch das Abschalten des Reglerausganges und damit das Abschalten der Umwälzpumpe vermieden, wobei ein Unterschreiten der Temperaturschwelle durch den Istwert wieder zum Einschalten des Reglers bzw. der Pumpe führt.According to the invention, the controller output can also be switched off when the actual temperature exceeds a setpoint value which is higher than the setpoint value, with the temperature preferably being about 1-3 ° C. above the setpoint value. At the end of a hot water withdrawal, the actual value rises only slowly because of the then lack of flow, whereby the pump speed only slowly approaches zero and it in the heating circuit to a pumping back hot storage medium in the buffer memory and thus to a mixing of the lower cold storage medium with the hot storage medium , So a deletion in the buffer memory would come. This is avoided by switching off the controller output and thus switching off the circulating pump, wherein falling below the temperature threshold by the actual value again leads to switching on the controller or the pump.

Wird die primärseitige Eintrittstemperatur des Wärmetauschers durch einen im Heizkreis eingebundenen thermischen Mischer auf einen vorbestimmbaren Höchstwert begrenzt, kann das Regelverhalten in Folge der geringeren Regler- und Pumpendynamik verbessert werden. Außerdem läßt sich die Verkalkungsgefahr aufgrund der geringeren Temperaturen im Wärmetauscher verringern.If the primary-side inlet temperature of the heat exchanger is limited to a predeterminable maximum value by a thermal mixer integrated in the heating circuit, the control behavior can be improved as a result of the lower controller and pump dynamics. In addition, the calcification risk can be due to lower temperatures in the heat exchanger.

In der Zeichnung ist das erfindungsgemäße Verfahren beispielsweise anhand eines Anlagenschemas veranschaulicht.In the drawing, the inventive method is illustrated for example by means of a plant scheme.

Eine Brauchwarmwasseranlage 1 umfaßt einen Heizkreis 2 mit einem Pufferspeicher 3 und einer in ihrer Drehzahl steuerbaren Umwälzpumpe 4 sowie einen Brauchwasserkreis 5 mit einem Brauchwasserzulauf 6 und einem Brauchwasserablauf 7, wobei ein Wärmetauscher 8 primärseitig in den Heizkreis 2 und sekundärseitig in den Brauchwasserkreis 5 eingebunden ist und bedarfsweise Brauchwasser im Durchlauferhitzerprinzip erwärmt. Zur Regelung der Entnahmetemperatur des Brauchwassers gibt es einen PID-Regler 9, der den Pumpenantrieb 10 in Abhängigkeit vom Vergleich der sekundärseitigen Austrittstemperatur des Wärmetauschers 8 als Istwert mit einem vorgegebenen Sollwert ansteuert. Ein Temperaturfühler 11 im Austrittsbereich des Brauchwasserablaufes aus dem Wärmetauscher 8 liest die entsprechenden Temperaturwerte in den Regler 9 ein. Der Pumpenantrieb 10 wird über den gesamten Drehzahlbereich von Drehzahlstufe Null bis zur Nenndrehzahl ohne Erkennung eines Durchflusses durch den Brauchwasserkreis 5 vom Regler 9 angesteuert, so daß sich sowohl ein Bereitschaftszustand im Wärmetauscher 8 ergibt als auch die Entnahmetemperatur des Brauchwassers in engen Grenzen konstant halten läßt, wobei zur Beseitigung der Reglerträgheit aufgrund der Sättigungsdrift des Integralteiles dieser Integralteil bei Drehzahlstufe Null und bei einem bestimmten Temperaturgradienten der Austrittstemperatur in die Grundstellung zurückversetzt wird.A domestic hot water system 1 comprises a heating circuit 2 with a buffer memory 3 and a controllable in their speed circulation pump 4 and a service water circuit 5 with a service water inlet 6 and a service water outlet 7, a heat exchanger 8 is primary side in the heating circuit 2 and secondary side integrated in the hot water circuit 5 and if necessary, hot water heated in a water heater principle. To control the removal temperature of the process water, there is a PID controller 9, which controls the pump drive 10 as a function of the comparison of the secondary outlet temperature of the heat exchanger 8 as an actual value with a predetermined setpoint. A temperature sensor 11 in the outlet region of the process water drain from the heat exchanger 8 reads the corresponding temperature values into the controller 9. The pump drive 10 is controlled over the entire speed range of speed level zero to the rated speed without detection of a flow through the hot water circuit 5 from the controller 9, so that both a standby state in the heat exchanger 8 results as well as keep the discharge temperature of the service water within narrow limits constant wherein to eliminate the regulator inertia due to the saturation drift of the integral part of this integral part at zero speed and at a certain temperature gradient of the outlet temperature is returned to the normal position.

Zur Verbesserung des Regelverhaltens und zur Vermeidung von Verkalkungen im Wärmetauscher 8 kann in den Heizkreis 2 ein thermischer Mischer 12 mit einer dem Pufferspeicher 3 überbrückenden Umgehungsleitung 13 eingebaut sein, so daß die primärseitige Eintrittstemperatur des Wärmetauschers 8 auf einen bestimmten Höchstwert begrenzt wird.To improve the control behavior and to avoid calcifications in the heat exchanger 8, a thermal mixer 12 may be installed with the buffer 3 bridging bypass line 13 in the heating circuit 2, so that the primary-side inlet temperature of the heat exchanger 8 is limited to a certain maximum value.

Claims (3)

  1. Method for regulating the tapping temperature of sanitary water heated in the secondary side in a heat exchanger (8) which is incorporated into the primary side in a heating circuit leading via a heat source (3), particularly a buffer storage device, equipped with a circulation pump (4) which can be controlled in relation to speed, according to which a PID regulator (9) controls the pump drive (10) in dependence upon the comparison of the measured secondary-side outlet temperature of the heat exchanger (8) as an actual value with a predefined target value, characterised in that the PID regulator (9) is equipped with a regulating stage for zero speed and the pump drive (10) is controlled over the whole speed range only in dependence upon the actual / target value comparison wherein in the case of the zero speed stage and a detectable temperature gradient of the outlet temperature the I part of the PID regulator (9) is reset to its initial state.
  2. Method according to claim 1, characterised in that the regulator outlet is shut off if the actual value exceeds a threshold which is increased in relation to the target value.
  3. Method according to claim 1 or 2, characterised in that the primary-side inlet temperature of the heat exchanger (3) is limited to a predefinable maximum value by a thermal mixer (12) incorporated into the heating circuit.
EP01890113A 2000-04-19 2001-04-12 Method for regulating the tapping temperature of sanitary water Expired - Lifetime EP1148302B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0069300A AT411632B (en) 2000-04-19 2000-04-19 METHOD FOR REGULATING THE TAKE-OUT TEMPERATURE OF HOT WATER
AT6932000 2000-04-19

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EP1148302A2 EP1148302A2 (en) 2001-10-24
EP1148302A3 EP1148302A3 (en) 2003-01-02
EP1148302B1 true EP1148302B1 (en) 2006-06-14

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DE10032714A1 (en) * 2000-07-07 2002-01-24 Solvis Solarsysteme Gmbh Arrangement and method for providing hot domestic water
DE10144595B4 (en) * 2001-09-11 2004-03-04 Danfoss A/S Central heating system
EP2077423A1 (en) * 2008-01-02 2009-07-08 Esbe Ab Regulation of flow temperature of a liquid in a heating circuit
FR2963087B1 (en) * 2010-07-26 2014-12-12 Vitherm HOT WATER PRODUCTION APPARATUS AND METHOD FOR OPERATING SUCH APPARATUS
DE102019215121A1 (en) * 2019-10-01 2021-04-01 Robert Bosch Gmbh Method for regulating the temperature of a dispensing fluid

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Also Published As

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AT411632B (en) 2004-03-25
EP1148302A3 (en) 2003-01-02
DE50110100D1 (en) 2006-07-27
ATA6932000A (en) 2003-08-15
EP1148302A2 (en) 2001-10-24

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