EP1691138A2 - Chaudière mixte et procédé pour son opération - Google Patents

Chaudière mixte et procédé pour son opération Download PDF

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Publication number
EP1691138A2
EP1691138A2 EP05111819A EP05111819A EP1691138A2 EP 1691138 A2 EP1691138 A2 EP 1691138A2 EP 05111819 A EP05111819 A EP 05111819A EP 05111819 A EP05111819 A EP 05111819A EP 1691138 A2 EP1691138 A2 EP 1691138A2
Authority
EP
European Patent Office
Prior art keywords
water
heat exchanger
heating
temperature
circuit
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.)
Withdrawn
Application number
EP05111819A
Other languages
German (de)
English (en)
Other versions
EP1691138A3 (fr
Inventor
Bernulf Goesling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1691138A2 publication Critical patent/EP1691138A2/fr
Publication of EP1691138A3 publication Critical patent/EP1691138A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • F24H15/215—Temperature of the water before 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
    • F24H15/212—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
    • F24H15/238—Flow rate
    • 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
    • F24H15/335—Control of pumps, e.g. on-off control
    • F24H15/34—Control of the speed of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/36—Control of heat-generating means in heaters of burners

Definitions

  • the invention relates to a heater for space heating and water heating and a method for operating the heater according to the preamble of the independent claims.
  • Combined heaters for space heating and water heating which are also referred to as combi heaters or circulating water heaters, have a primary heat exchanger, which is heated by a burner and to which an internal heating circuit is connected.
  • the internal heating circuit in which heating water heated by the primary heat exchanger circulates, is connected to an external heating circuit and to a hot water circuit via a changeover valve.
  • Radiators for space heating are connected to the heating circuit.
  • the hot water circuit leads to a primary side of a secondary heat exchanger whose secondary side is connected to the drinking water network and via a service water pipe leads to at least one hot water tapping point.
  • the circulation of the heating water in the heating circuit by means of a circulating pump, which is controlled by a control unit.
  • Such a heater for space heating and water heating is known from EP 427 121 A2, is provided in the improvement of the domestic water comfort, during the standstill of the burner to largely maintain the temperature in the primary circuit of the secondary heat exchanger at least temporarily by the circulation pump maintain a flow of the heating water, which is guided only through the primary heat exchanger and the primary circuit of the secondary heat exchanger.
  • a heater for space heating and water heating is known in which the circulation pump of the heating circuit at periodic intervals disabled and after the restart of the pump, the switching valve is delayed for switching on the heating circuit, so that in the meantime the secondary heat exchanger is preheated ,
  • the temperature of the heating water in the heating circuit is always higher than the temperature of the tapped heated hot water in the combined heaters for space heating and hot water.
  • the temperature of the heating water in the heating circuit which is required to reach the desired outlet temperature of the service water depends, for example, on from the amount of water removed at the taps. With a small amount of hot water, the temperature difference of the hot water to the heating water in the heating circuit is lower than a large amount of hot water. This has the disadvantage that in rapid changes of the amount of hot water by the user, the temperature of the heating water in the heating circuit may need to be changed quickly, so that a stable or substantially constant outlet temperature is reached.
  • the temperature of the heating water can be changed only slowly.
  • a rapid change of the burner output by a temperature controller in the internal control causes only a slow change of the heating water temperature due to the mass of the primary heat exchanger. This property causes significant temperature variations when tap changes occur.
  • Object of the present invention is to largely prevent fluctuations in the hot water temperature of the service water, which are caused by changing the dispensing amount during service water withdrawal, so that the hot water temperature can be kept substantially stable at the desired hot water temperature.
  • the object of the invention is achieved with the characterizing measures of claim 1 and with the characterizing measures of the independent method claim.
  • the invention it is possible, with simple means, which requires only an implementation of an algorithm in the existing control of the heater, to minimize fluctuations in the hot water temperature due to changing taps during the tap of service water. This makes it possible to keep the hot water temperature substantially stable at the desired value.
  • a change in the mass flow of the heating water of the device-internal heating circuit and the device-internal hot water circuit is generated in service water.
  • an increase in the temperature of the heating water in the hot water circuit is achieved.
  • an increase in the mass flow of the heating water flowing through the primary heat exchanger produces a decrease in the temperature of the heating water in the service water circuit.
  • the circulation pump serves as a means for adjusting the mass flow.
  • the delivery rate of the circulating pump is controlled such that the mass flow of the heating water flowing in service water mode via the primary heat exchanger can be changed as a function of the temperature of the service water. It is provided that when the temperature of the service water is above a set target value, the mass flow rate is increased and that the mass flow rate is reduced when the temperature of the service water is below the setpoint value.
  • At least one sensor is provided which detects the temperature of the service water in the service water line and / or the amount of water flowing in the service water line.
  • the sensor can be a temperature sensor and / or a water quantity sensor serve. But it is also conceivable that in each case another temperature sensor is arranged to form the sensor signal in the device internal hot water circuit before the secondary heat exchanger and the secondary heat exchanger, from the temperature difference of the heating water before the secondary heat exchanger and after the secondary heat exchanger on the required change in mass flow in the device-internal heating inferred.
  • FIG. 1 shows a schematic diagram of a hydraulic circuit diagram of a heater for space heating and hot water.
  • the heater has a burner 10, which acts on a primary heat exchanger 11 with fuel gas.
  • a device-internal heating circuit 12 with a circulation pump 13 and a switching valve 14 is connected to the primary heat exchanger 11.
  • the device-internal heating circuit 12 leads to a flow 15 and a return 16 of a heating circuit 17, which supplies a heating element, not shown, a space heating with heating water.
  • From the device-internal heating circuit 12 branches off a device-internal hot water circuit 18, which is connected to a secondary heat exchanger 20 and which leads as a primary circuit via a return line 19 back to a third connection of the switching valve 14.
  • the secondary heat exchanger 20 leads a connected to a drinking water network service water line 21 with at least one tap 22.
  • a temperature sensor 23 is arranged in the service water pipe 21, which detects the temperature of the service water.
  • the heater also has a controller 30 which is connected via a first control line 31 to the circulation pump 13 and a second control line 32 to the switching valve 14 and a signal line 33 to the temperature sensor 23, wherein via the signal line 33, the sensor signal of the temperature sensor 23 is transmitted to the controller 30.
  • the heater can be operated in a heating operation or in a service water operation.
  • In heating mode is by means of the circulation pump 13 and a corresponding implemented in the control unit 30 control or heating the circulating in the heating circuit 12 and the heating circuit 17 heating water by means of the burner 10 and the primary heat exchanger 17 to the desired temperature.
  • the service water operation is initiated when 20 tap water is removed at the tap.
  • the tapping process is transmitted from a flow switch, not shown, in the service water line 21 to the controller 30, which switches over the control line 32, the switching valve 14, so that the device-internal heating circuit 12 circulates through the device-internal hot water circuit 18 and the return line 19.
  • the circulation pump 13 remains in operation, so that is heated by the circulating heating water in the hot water circuit 18 of the secondary heat exchanger 20 and a heat transfer from the primary circuit to the secondary circuit with the service water 21.
  • an algorithm is implemented which allows, depending on the temperature of the service water, which is measured by the temperature sensor 23, a corresponding change in the mass flow of the heating water flowing through the primary heat exchanger of the device-internal heating circuit 12 and at the same time a change in burner performance make.
  • the change in the device-internal heating circuit 12 and the device-internal hot water circuit 18 flowing mass flow for heat transfer in the secondary heat exchanger 20 is carried out by means of the flow rate of the circulating pump 13 of the device-internal heating circuit 12.
  • the algorithm provides that the mass flow of the heating water in the hot water circuit 18 is increased by a brief increase in the flow rate of the circulating pump 13 when the temperature of the water in the hot water pipe 21 measured by the temperature sensor 23 is above a predetermined or set desired value.
  • a larger amount of water flows through the primary heat exchanger 11, whereby the temperature of the heating water in the device-internal heating circuit 12 and thereby also reduced in the hot water circuit 18 and thus no additional heat through the primary circuit of the secondary heat exchanger 20 is transmitted to the secondary side with the hot water line 21.
  • the delivery rate of the circulation pump 13 is reduced, so that the mass flow of the heating water flowing through the primary heat exchanger 11 is lower, whereby the heating gas generated by the burner 10, the heating water more heated in the heating circuit 12 and the hot water circuit 18.
  • the more heated heating water flows through the primary side of the secondary heat exchanger 20, resulting in a higher temperature of the service water in the service water pipe 21 due to the heat transfer to the secondary side of the secondary heat exchanger 20.
  • thermosensor is arranged to form the sensor signal before the secondary heat exchanger 20 and after the secondary heat exchanger 20 respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
EP05111819A 2005-02-15 2005-12-08 Chaudière mixte et procédé pour son opération Withdrawn EP1691138A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005006757A DE102005006757A1 (de) 2005-02-15 2005-02-15 Kombiniertes Heizgerät zur Raumheizung und Warmwasserbereitung sowie Verfahren zum Betreiben desselben

Publications (2)

Publication Number Publication Date
EP1691138A2 true EP1691138A2 (fr) 2006-08-16
EP1691138A3 EP1691138A3 (fr) 2010-10-27

Family

ID=36388103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05111819A Withdrawn EP1691138A3 (fr) 2005-02-15 2005-12-08 Chaudière mixte et procédé pour son opération

Country Status (2)

Country Link
EP (1) EP1691138A3 (fr)
DE (1) DE102005006757A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2280230A3 (fr) * 2009-07-23 2012-03-21 Viessmann Werke GmbH & Co. KG Procédé de surveillance de l'état de salissure d'un échangeur thermique sur un appareil de chauffage
EP2372259A3 (fr) * 2010-03-27 2014-01-22 Robert Bosch GmbH Procédé de chauffage d'eau en continu et système de chauffage d'eau

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1582268A (en) * 1976-07-12 1981-01-07 Chaffoteaux Et Maury Hot water installations
EP0692682A1 (fr) * 1994-07-15 1996-01-17 INTEGRA S.r.l. Chaudière, en particulier chaudière mixte avec délivrance instantanée d'eau chaude sanitaire
EP0886110A2 (fr) * 1997-06-19 1998-12-23 Robert Bosch Gmbh Méthode pour préparer l'eau sanitaire dans un système mixte
DE19725952A1 (de) * 1997-06-19 1999-01-28 Bosch Gmbh Robert Verfahren zur Brauchwasserbereitstellung in einem kombinierten System
EP0953808A2 (fr) * 1998-05-02 1999-11-03 WILO GmbH Unité hydraulique avec capteur de pression pour une installation combinée d'eau de chauffage et d'eau chaude sanitaire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1582268A (en) * 1976-07-12 1981-01-07 Chaffoteaux Et Maury Hot water installations
EP0692682A1 (fr) * 1994-07-15 1996-01-17 INTEGRA S.r.l. Chaudière, en particulier chaudière mixte avec délivrance instantanée d'eau chaude sanitaire
EP0886110A2 (fr) * 1997-06-19 1998-12-23 Robert Bosch Gmbh Méthode pour préparer l'eau sanitaire dans un système mixte
DE19725952A1 (de) * 1997-06-19 1999-01-28 Bosch Gmbh Robert Verfahren zur Brauchwasserbereitstellung in einem kombinierten System
EP0953808A2 (fr) * 1998-05-02 1999-11-03 WILO GmbH Unité hydraulique avec capteur de pression pour une installation combinée d'eau de chauffage et d'eau chaude sanitaire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2280230A3 (fr) * 2009-07-23 2012-03-21 Viessmann Werke GmbH & Co. KG Procédé de surveillance de l'état de salissure d'un échangeur thermique sur un appareil de chauffage
EP2372259A3 (fr) * 2010-03-27 2014-01-22 Robert Bosch GmbH Procédé de chauffage d'eau en continu et système de chauffage d'eau

Also Published As

Publication number Publication date
DE102005006757A1 (de) 2006-08-17
EP1691138A3 (fr) 2010-10-27

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