EP0773411A1 - Procédé pour contrÔler un chauffe-eau à gaz - Google Patents

Procédé pour contrÔler un chauffe-eau à gaz Download PDF

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Publication number
EP0773411A1
EP0773411A1 EP96116544A EP96116544A EP0773411A1 EP 0773411 A1 EP0773411 A1 EP 0773411A1 EP 96116544 A EP96116544 A EP 96116544A EP 96116544 A EP96116544 A EP 96116544A EP 0773411 A1 EP0773411 A1 EP 0773411A1
Authority
EP
European Patent Office
Prior art keywords
temperature
flow
limit value
heat exchanger
gradient
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Withdrawn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
EP96116544A
Other languages
German (de)
English (en)
Inventor
Albin Kehl
Franz Schmuker
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 EP0773411A1 publication Critical patent/EP0773411A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/14—Differentiation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature

Definitions

  • the invention is based on a method according to the type of the main claim.
  • the measured variable detected by the temperature sensor is the flow temperature itself, and the device or the burner is switched off when the flow temperature reaches a limit value which is above the normal operating value range.
  • a temperature limiter or temperature monitor In order to avoid an unwanted response of such a temperature sensor, which is referred to as a temperature limiter or temperature monitor, its response value must be at a safety distance above the operating value range of the flow temperature.
  • the temperature sensor responds in the event of a pump failure, sudden throttling or shutting off the water circulation, or when the device is started up dry, the heat stored in the heat exchanger, in the combustion chamber and in the neighboring components leads to a further rise in temperature in the area of the heat exchanger, so that there for seals and other parts of high quality materials must be used and high demands are placed on the mechanical connections of the parts.
  • the prior art also includes a method (EP 0 433 215 B1) in which, in addition to a temperature sensor in the flow line, a second temperature sensor measuring the heating water temperature at another point on or in the heat exchanger is provided and the control device evaluates the measured value difference between the two temperature sensors. This makes it possible to monitor the heating water circulation with the help of a further temperature sensor.
  • the inventive method according to the characterizing features of the main claim has the advantage that an accident or the risk of overheating of the heat exchanger is recognized in good time before a limit temperature of the flow water or the flow-side heat exchanger parts is reached and the burner is regulated back in time or switched off without a second temperature sensor is provided at another point of the heat exchanger and must be included in the electronics of the control unit.
  • the temperature sensor which is used anyway in devices with flow temperature control can advantageously be used as the temperature sensor.
  • the shutdown necessary in the event of a fault can take place at an optimal time in the entire power range between nominal power and minimum power.
  • the temperature gradient can be calculated using the formula 25 K times the quotient of the power called up and the nominal power.
  • a lockout is expediently triggered.
  • a limit value for the flow temperature for example 60 ° C., as a criterion for the need for a fault lock-out in order to prevent the safety device from responding too quickly.
  • the device after the specified time after switching on (power on), for example after 3 minutes, the device is only switched off and restarted after a specified blocking time, for example after 3 minutes. This takes account of temporary influences on the rise in the flow temperature, which do not justify a lockout.
  • a predetermined limit value for example 60 ° C.
  • the method according to the invention detects a malfunction or a possible overheating of the heat exchanger at an early stage and thereby performs the function of a lack of water protection or dry-running protection.
  • a temperature monitor responding to a limit value of the flow temperature can be provided, the switching signal of which can be processed without complex intervention in the electronics of the control device.
  • the method according to the invention is explained below using a simplified diagram.
  • the time from switching on (mains on) of a water heater is plotted on the abscissa and the flow temperature of this device reached at the respective time on the ordinate.
  • the solid line a represents the function of the flow temperature as a function of the duty cycle, assuming that the device is operating at the lower limit of its performance range.
  • the two dashed lines b and c represent the temperature gradients of the flow temperature defined for the two limits of the power range, line b for the nominal power and line c for the minimum power.
  • a dashed line d represents a limit temperature of 60 ° C, which is taken into account in the switch-off criteria.
  • the temperature gradients are calculated according to the formula 25 K times the quotient from the current power to the nominal power of the device, which results in the corresponding linear slopes of lines b and c.
  • time t 1 which is about 3 minutes after switching on the device or after the burner has been switched on
  • the temperature gradient has not yet reached the critical value according to line c, so that the heating continues without interruption.
  • time t 2 the critical value of the temperature gradient has already been reached, but has not yet reached the limit temperature of 60 ° C., so that according to the invention there is also no shutdown. If, however, the temperature gradient continues to rise after this point in time and the flow temperature reaches the limit temperature of 60 ° C as shown, the device is taken out of operation in good time before overheating and restarted after a specified blocking time.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Control Of Combustion (AREA)
EP96116544A 1995-11-11 1996-10-16 Procédé pour contrÔler un chauffe-eau à gaz Withdrawn EP0773411A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19542088 1995-11-11
DE19542088A DE19542088C1 (de) 1995-11-11 1995-11-11 Verfahren zum Steuern eines gasbeheizten Wassererhitzers

Publications (1)

Publication Number Publication Date
EP0773411A1 true EP0773411A1 (fr) 1997-05-14

Family

ID=7777220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96116544A Withdrawn EP0773411A1 (fr) 1995-11-11 1996-10-16 Procédé pour contrÔler un chauffe-eau à gaz

Country Status (2)

Country Link
EP (1) EP0773411A1 (fr)
DE (1) DE19542088C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011009750A1 (de) * 2011-01-28 2012-08-02 Viessmann Werke Gmbh & Co Kg Verfahren zum Betrieb eines Heizgerätes
CN110307650A (zh) * 2019-05-31 2019-10-08 青岛经济技术开发区海尔热水器有限公司 燃气热水器控制方法及燃气热水器

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1085269A3 (fr) * 1999-09-15 2003-01-29 Robert Bosch Gmbh Agencement pour le réglage d'un réchauffeur au besoin réel de la chaleur
DE10114823A1 (de) * 2001-03-26 2002-10-10 Siemens Building Tech Ag Verfahren und Vorrichtung zur Überwachung von Brennern

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0104077A2 (fr) * 1982-09-20 1984-03-28 Honeywell Inc. Installation de chauffage à l'abri de corrosion
EP0320564A2 (fr) * 1987-12-17 1989-06-21 Matsushita Electric Industrial Co., Ltd. Système pour amenée d'eau à température réglable
EP0346829A1 (fr) * 1988-06-15 1989-12-20 Firma J. Eberspächer Dispositif de chauffage à plusieurs niveaux de puissance pour voitures
EP0380369A1 (fr) * 1989-01-26 1990-08-01 Otter Controls Limited Commande pour éléments chauffants à alimentation électrique
EP0433215A1 (fr) * 1989-12-12 1991-06-19 Joh. Vaillant GmbH u. Co. Méthode et appareil pour contrôler la circulation d'eau chaude dans une chaudière à gaz
DE4221715A1 (de) * 1991-07-17 1993-01-21 Landis & Gyr Betriebs Ag Verfahren zur regelung eines heizkessels mit einem nicht modulierenden brenner und vorrichtung zur durchfuehrung des verfahrens
GB2265027A (en) * 1992-03-12 1993-09-15 Worcester Heat Systems Ltd Controlling operation of a gas boiler
EP0565853A1 (fr) * 1992-04-15 1993-10-20 Landis & Gyr Technology Innovation AG Procédé et dispositif de régulation de la température aller d'un système de chauffage et dispositif de commande par la mise en oeuvre du procédé

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0104077A2 (fr) * 1982-09-20 1984-03-28 Honeywell Inc. Installation de chauffage à l'abri de corrosion
EP0320564A2 (fr) * 1987-12-17 1989-06-21 Matsushita Electric Industrial Co., Ltd. Système pour amenée d'eau à température réglable
EP0346829A1 (fr) * 1988-06-15 1989-12-20 Firma J. Eberspächer Dispositif de chauffage à plusieurs niveaux de puissance pour voitures
EP0380369A1 (fr) * 1989-01-26 1990-08-01 Otter Controls Limited Commande pour éléments chauffants à alimentation électrique
EP0433215A1 (fr) * 1989-12-12 1991-06-19 Joh. Vaillant GmbH u. Co. Méthode et appareil pour contrôler la circulation d'eau chaude dans une chaudière à gaz
DE4221715A1 (de) * 1991-07-17 1993-01-21 Landis & Gyr Betriebs Ag Verfahren zur regelung eines heizkessels mit einem nicht modulierenden brenner und vorrichtung zur durchfuehrung des verfahrens
GB2265027A (en) * 1992-03-12 1993-09-15 Worcester Heat Systems Ltd Controlling operation of a gas boiler
EP0565853A1 (fr) * 1992-04-15 1993-10-20 Landis & Gyr Technology Innovation AG Procédé et dispositif de régulation de la température aller d'un système de chauffage et dispositif de commande par la mise en oeuvre du procédé

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011009750A1 (de) * 2011-01-28 2012-08-02 Viessmann Werke Gmbh & Co Kg Verfahren zum Betrieb eines Heizgerätes
CN110307650A (zh) * 2019-05-31 2019-10-08 青岛经济技术开发区海尔热水器有限公司 燃气热水器控制方法及燃气热水器

Also Published As

Publication number Publication date
DE19542088C1 (de) 1996-10-24

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