EP0735331A2 - Chaudière et méthode pour régler une chaudière - Google Patents

Chaudière et méthode pour régler une chaudière Download PDF

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Publication number
EP0735331A2
EP0735331A2 EP96100862A EP96100862A EP0735331A2 EP 0735331 A2 EP0735331 A2 EP 0735331A2 EP 96100862 A EP96100862 A EP 96100862A EP 96100862 A EP96100862 A EP 96100862A EP 0735331 A2 EP0735331 A2 EP 0735331A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
burner
heater
burner output
control device
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.)
Granted
Application number
EP96100862A
Other languages
German (de)
English (en)
Other versions
EP0735331B1 (fr
EP0735331A3 (fr
Inventor
Ulrich Ing. Besser
Christian Dipl.-Ing. Welte
Franz Dipl.-Ing. Schmuker
Sandra Dipl.-Ing. Cordes
Arno Dipl.-Ing. Boettcher
Manfred Dipl.-Ing. Hosch
Matthias Ing. Schmidl
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 EP0735331A2 publication Critical patent/EP0735331A2/fr
Publication of EP0735331A3 publication Critical patent/EP0735331A3/fr
Application granted granted Critical
Publication of EP0735331B1 publication Critical patent/EP0735331B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • 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
    • F24H15/235—Temperature of exhaust gases
    • 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
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/0036—Dispositions against condensation of combustion products

Definitions

  • the invention relates to a method for controlling a heater according to the preamble of the main claim, and a heater for performing the method.
  • Heat exchangers are known from EP 0 184 612 B2 which are provided with a special protective layer and are therefore resistant to the acid formers contained in the condensate of the exhaust gases.
  • chimneys With chimneys as flue gas routing, there is the option of using fireclay inner pipes with glazing, flexible or rigid stainless steel pipes or plastic pipes so that the chimneys are insensitive to flue gas condensate.
  • the control method according to the invention with the features of the main claim has the advantage that the measures can be largely dispensed with by avoiding condensate in the exhaust gas routing. If the burner output set according to the heat requirement is below the determined burner output setpoint to reach the minimum necessary exhaust gas temperature at a certain flow temperature of the heating water, the burner output is raised to the previously determined burner output setpoint. These measures ensure that common control procedures, such as weather-based or control room-based controls can continue to be used without restriction and only by increasing the lower control limit for the burner output can avoid condensate.
  • the dependency of the burner output setpoints on the flow temperatures of the heating water and on the exhaust gas routing is advantageously determined by a characteristic curve stored in the control unit. This ensures that during the operation of the heater, each burner output setpoint required to avoid condensate can be assigned as the lower limit of the burner output control range while the heater is operating.
  • the characteristic curve can be preselected by a potentiometer connected to the control unit.
  • the burner output is corrected using the burner output setpoints determined from the preselected characteristic. Since these burner output setpoints are greater than the originally set burner output, the corrected burner output is advantageously compensated for by a shorter on-time and / or longer off-time of the burner. This ensures that the heater does not emit more heating energy than was required in accordance with the heat requirement.
  • a heater which is particularly suitable for carrying out the control method according to the invention is distinguished in that at least one die in a control unit Burner output setpoints in connection with the associated flow temperatures comprehensive characteristic is stored.
  • FIG. 1 shows the schematically illustrated heating device according to the invention for carrying out the control method according to the invention
  • FIG. 2 shows a characteristic field in a burner output / flow temperature diagram.
  • the heater according to the invention shown schematically in FIG. 1 has a burner 10.
  • a heat exchanger 16 arranged in a heating water circuit with a flow 12 and a return 14 is subjected to hot combustion gases from the burner 10.
  • Consumers can be connected to the heating water circuit, for example in the form of a heating system with space heaters, which emit the heating energy to the environment in the form of radiant heat, or systems for hot water supply, which can be combined with the heating system, for example.
  • an exhaust gas guide 18 is arranged, which leads the exhaust gases generated during combustion to the outside environment.
  • Combustion air can be supplied to the burner 10 via a line 20 arranged coaxially to the exhaust gas duct 18 in the case of the heater operating independently of the ambient air.
  • the flow temperature of the heating water serves as the central variable for the control of the heating objects.
  • a temperature sensor 24 connected to a control unit 22 is arranged in the flow 12 of the heating water circuit.
  • the flow temperature is regulated directly depending on the outside temperature.
  • a setpoint for the flow temperature is determined in the control unit 22, to which the heating water is heated with the aid of the temperature sensor 24 arranged on the flow 12.
  • the heater works with a low flow temperature (eg 35 ° C).
  • the output of the burner 10 is preferably continuously regulated between 60% and 100%.
  • the flue gas temperature is essentially dependent on the flow temperature of the heating water and the burner output set according to the heat requirement, as well as on the length and type of flue gas duct 18 that the exhaust gas temperature in the exhaust line 18 falls below the dew point.
  • the minimum necessary exhaust gas temperature is determined in order to keep the exhaust gas temperature above the dew point in the course of the exhaust gas duct 18.
  • the minimum necessary exhaust gas temperature was determined in laboratory tests immediately at the entry of the exhaust gases into the exhaust gas duct 18 so that no condensate was formed in the entire exhaust gas duct 18.
  • the minimum necessary exhaust gas temperature essentially depends on the length and diameter of the Exhaust gas guide 18 and from the heat transfer between exhaust gas guide 18 and the coaxially arranged line 20 for the supply of combustion air.
  • a long exhaust gas duct 18 requires a higher minimum necessary exhaust gas temperature than a short exhaust gas duct 18.
  • burner output setpoints are determined for reaching the minimum necessary exhaust gas temperature at different flow temperatures. It is known that the exhaust gas temperature increases in proportion to the flow temperature of the heating water. Since the minimum necessary flue gas temperature was determined in the first step, it is now possible to define burner output setpoints as the lower limit for the burner output control range at the various flow temperatures of the heating water. For example, at a flow temperature of 35 ° C, a larger burner output setpoint is necessary in order to be free of condensate in the exhaust gas duct 18 than at a flow temperature of 70 ° C.
  • the actual burner output values set according to the heat requirement are compared with the burner output setpoints during the heating process. If the actual burner output is below the burner output setpoint, this is replaced by the burner output setpoint at the corresponding flow temperature of the heating water. It is thereby achieved according to the invention that the exhaust gas temperature does not fall below the dew point of the exhaust gas during the heating, in particular at low flow temperatures of the heating water, and the exhaust gas duct 18 remains free of exhaust gas condensate.
  • the assignment of the burner output setpoints in connection with the associated flow temperatures of the heating water is stored as a characteristic curve in the control unit 22.
  • the characteristic curve decreases with increasing flow temperatures, ie with an increasing flow temperature, smaller burner output setpoints are possible as the lower limit of the burner output control range.
  • the control method according to the invention is activated.
  • the heater starts to heat the heating water up to the setpoint.
  • the heating output or burner output is set between 60% and 100% according to the heat requirement. If the set burner output actual value is below the burner output setpoint, the burner output is corrected or increased by the characteristic curve in the control unit.
  • Characteristic curve 1 is selected as the lower adjustable characteristic curve for heating systems with a short exhaust gas duct 18 and a low value for the heat transfer between the exhaust gas duct 18 and the line 20 for the supply of the combustion air
  • characteristic curve 5 is selected for the upper adjustable characteristic curve for a long exhaust duct 18 and one high value for the heat transfer between the exhaust duct 18 and the line 20 is selected for the supply of combustion air.
  • Corresponding fine adjustments with regard to the length of the exhaust gas duct 18 and the heat transfer through the characteristic curves 2, 3 and 4 are possible between these two characteristic curves.
  • the decision as to which characteristic is selected is then based on the experience of the heating installer or on measurements of the minimum necessary exhaust gas temperature in advance.
  • the setting of the characteristic curve required for the exhaust gas routing is carried out by a potentiometer 26.
  • the potentiometer 26 connected to the control unit is attached to the heater in such a way that the operator or the operator Installer of the heating system can make the appropriate setting without dismantling the heater.
  • the burner output is corrected on the basis of the control method according to the invention, if the on-time or the off-time of the burner 10 is maintained, the heating energy supply would be greater than that originally required in accordance with the heat requirement.
  • shorter switch-on phases and / or longer switch-off phases of the burner 10 are set by the control unit 22.
  • the switching hysteresis in a two-point control can be optimized as already described in an earlier application with the file number P 39 07 955.4-34.
  • control method is not restricted to a heater in accordance with the exemplary embodiment, but can be used wherever a heater connected to an exhaust gas duct is operated with a conventional control method.

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)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
EP96100862A 1995-03-27 1996-01-23 Chaudière et méthode pour régler une chaudière Expired - Lifetime EP0735331B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19510475A DE19510475A1 (de) 1995-03-27 1995-03-27 Verfahren zur Regelung eines Heizgerätes
DE19510475 1995-03-27

Publications (3)

Publication Number Publication Date
EP0735331A2 true EP0735331A2 (fr) 1996-10-02
EP0735331A3 EP0735331A3 (fr) 1997-05-07
EP0735331B1 EP0735331B1 (fr) 1999-12-15

Family

ID=7757415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100862A Expired - Lifetime EP0735331B1 (fr) 1995-03-27 1996-01-23 Chaudière et méthode pour régler une chaudière

Country Status (3)

Country Link
EP (1) EP0735331B1 (fr)
DE (2) DE19510475A1 (fr)
ES (1) ES2141399T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1028288A2 (fr) * 1999-02-12 2000-08-16 Robert Bosch Gmbh Procédé et dispositif pour commander un appareil de chauffage avec une évacution des gaz de fumée

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022108767B3 (de) * 2022-04-11 2023-05-25 Viessmann Climate Solutions Se Verfahren zum Ermitteln einer Zulauftemperatur, Verfahren zum Steuern eines Wärmeerzeugers, Verfahren zum Starten eines Wärmeerzeugers, Wärmeerzeuger und Steuervorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3510136A1 (de) * 1985-03-18 1986-09-18 Körting Hannover AG, 3000 Hannover Regelanordnung fuer niedertemperatur-heizkessel
DE3923805A1 (de) * 1988-07-25 1990-02-01 Vaillant Joh Gmbh & Co Brennerbeheiztes geraet, zum beispiel kessel, wasserheizer oder dergleichen
GB2275099A (en) * 1993-01-23 1994-08-17 Jonathan Leslie Greenall Heating assemblies having a chimney
DE19503630A1 (de) * 1994-01-26 1995-10-12 Vaillant Joh Gmbh & Co Verfahren zum kondensatfreien Betreiben eines Umlaufwasserheizers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3510136A1 (de) * 1985-03-18 1986-09-18 Körting Hannover AG, 3000 Hannover Regelanordnung fuer niedertemperatur-heizkessel
DE3923805A1 (de) * 1988-07-25 1990-02-01 Vaillant Joh Gmbh & Co Brennerbeheiztes geraet, zum beispiel kessel, wasserheizer oder dergleichen
GB2275099A (en) * 1993-01-23 1994-08-17 Jonathan Leslie Greenall Heating assemblies having a chimney
DE19503630A1 (de) * 1994-01-26 1995-10-12 Vaillant Joh Gmbh & Co Verfahren zum kondensatfreien Betreiben eines Umlaufwasserheizers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1028288A2 (fr) * 1999-02-12 2000-08-16 Robert Bosch Gmbh Procédé et dispositif pour commander un appareil de chauffage avec une évacution des gaz de fumée
EP1028288A3 (fr) * 1999-02-12 2002-05-29 Robert Bosch Gmbh Procédé et dispositif pour commander un appareil de chauffage avec une évacution des gaz de fumée

Also Published As

Publication number Publication date
EP0735331B1 (fr) 1999-12-15
DE59603902D1 (de) 2000-01-20
EP0735331A3 (fr) 1997-05-07
ES2141399T3 (es) 2000-03-16
DE19510475A1 (de) 1996-10-02

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