EP0757214A1 - Générateur de chaleur pour utilisation à des températures basses et procédé pour la mise en oeuvre du générateur de chaleur - Google Patents

Générateur de chaleur pour utilisation à des températures basses et procédé pour la mise en oeuvre du générateur de chaleur Download PDF

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Publication number
EP0757214A1
EP0757214A1 EP96111974A EP96111974A EP0757214A1 EP 0757214 A1 EP0757214 A1 EP 0757214A1 EP 96111974 A EP96111974 A EP 96111974A EP 96111974 A EP96111974 A EP 96111974A EP 0757214 A1 EP0757214 A1 EP 0757214A1
Authority
EP
European Patent Office
Prior art keywords
heat generator
heating water
flow
channel
return
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Withdrawn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
EP96111974A
Other languages
German (de)
English (en)
Inventor
Gerd Köhler
Henning Freese
Ulf Wemken
Wilfried Gutzeit
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.)
August Brotje GmbH
Original Assignee
August Brotje 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 August Brotje GmbH filed Critical August Brotje GmbH
Publication of EP0757214A1 publication Critical patent/EP0757214A1/fr
Withdrawn legal-status Critical Current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
    • F24H9/0005—Details for water heaters
    • F24H9/0036—Dispositions against condensation of combustion products
    • 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
    • F24H9/12—Arrangements for connecting heaters to circulation pipes
    • F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters

Definitions

  • Heat generators are used in heating systems and for water heating.
  • the heating water in the housing of the heat generator is preferably heated by an oil or gas burner, the heat transfer surfaces being formed by the combustion chamber wall and the secondary heating surfaces arranged between the combustion chamber and the exhaust pipe.
  • the heating water chamber of the heat generator can be connected to a heating circuit via at least one flow connection and one return connection.
  • NT operation of the heat generator ie with return temperatures below the so-called dew point temperature of the heating gas, measures must be taken against corrosion of condensation.
  • An effective measure in this regard is that the cold return water is mixed with the already heated heating water before it reaches the heat exchanger walls in contact with the heating gas.
  • NT heat generators in which this measure is implemented have, for example, outlets of the boiler return in the upper region of the heating water chamber (see PS 3210327 or DE 44150289).
  • the addition of cold return water in the upper area of the heating water room improves the NT suitability of the heat generator, but at the same time influences the temperature stratification in the heating water room.
  • the training is achieved by adding cold return water to the upper area of the heating water room a stable temperature stratification in the heating water room constantly disturbed. There is a sudden local exchange of sometimes only small amounts of cold and warm water and thus temperature jumps with considerable temperature differences. If these temperature jumps occur in the area of the temperature sensor acting on the burner, the burner will switch on and off too often (unnecessarily). This leads to increased burner wear and tear, as well as increased energy consumption and increased pollutant emissions, and thus overall unsatisfactory operating behavior of the heat generator.
  • the object of the invention is to improve the operating behavior of the heat generator and that with consistently good or increased NT suitability.
  • the heat generator has a flow channel arranged in the housing and connecting the heating water chamber to the flow connection, and in that the temperature sensor is arranged in the flow channel.
  • the temperature sensor is always exposed to a forced flow of heating water when heating water is conveyed by the heat generator.
  • the heating water temperature in the flow channel and thus also at the sensor shows only slight fluctuations, because the forced flow in the flow channel ensures a good mixing of differently heated water quantities and therefore the temperature fluctuations in the area of the sensor resulting from the destruction of the heating water stratification are not effective.
  • Another advantageous embodiment results from the fact that two flow channels have at least one common temperature sensor. This advantage arises in particular if two additional connections for a second heating circuit are provided for the heat generator. A flow channel is provided for each of the two flow connections. These two flow channels each have a common channel section in which the common temperature sensors are arranged.
  • the opening of the flow channel is arranged in the lower region of the heating water chamber.
  • the heating water from the lower area of the heating water room, in which the lowest temperatures prevail is preferably conveyed out of the heating water room. This counteracts the formation of a cold heating water zone in the lower area of the heat generator, which leads to an improvement in NT suitability.
  • the heat generator have a return duct arranged in the housing and connecting the return connection to the upper region of the heating water chamber.
  • the return connection can thus, as usual, be arranged at the bottom of the housing.
  • the return water is led internally through the return duct to the upper area of the heating water room. If only the above flow channel (with a mouth in the lower area), the heat generator internally has an inlet of return water in the upper area of the heating water room, as well as an outflow of flow water from the lower area, while externally the connections to the heat generator are provided in a known manner: flow connection above, Return connection at the bottom.
  • the return duct also improves the NT suitability of the heat generator because the cold return water is preheated in the return duct before it flows into the upper area of the heating water chamber.
  • the return channel and / or the forward channel be delimited by the walls of the housing and a preferably one-piece molded part.
  • the molded part can form the corresponding channels both with the jacket and with the rear wall of the housing.
  • the heat generator have a mixing space arranged in the housing on the flow path between the return connection and the heating water space.
  • the mixing room is designed in such a way that the cold return water is mixed well with heating water that has already been heated before it enters the heating water room. This can be done, for example, by means of a partition between the mixing space provided with mixing openings and heating water room can be reached.
  • a further advantageous embodiment results if an overflow channel arranged in the housing and connecting the flow to the return is provided for the heat generator. Part of the cold return water then flows through the overflow channel directly to the flow connection. This means that when the heat generator is in operation, the heating water temperature in the heating water room will always be higher than in the flow, which will help improve the NT suitability.
  • a method according to the invention for operating the heat generator provides that the volume flow in the overflow channel can be adjusted.
  • the setting can be predefined for the heat generator by a suitable choice of length and cross-sectional area of the overflow channel, but it can also be carried out by means of a throttle element arranged in the overflow channel.
  • the setting makes it easy to adapt the heat generator to different operating conditions.
  • a larger volume flow in the overflow channel can e.g. always be set if there are special requirements for the NT suitability of the heat generator, i.e. if the heat generator is to be operated at very low return and flow temperatures without causing corrosion damage due to condensation.
  • volume flow is controlled according to the heating water temperature.
  • the volume flow in the overflow channel can be completely throttled, so that the maximum boiler efficiency achievable for the respective temperature spread is achieved.
  • a simple adjusting and throttling element can be arranged in the heating water, which automatically controls the volume flow according to the heating water temperature by means of a bimetal or an expansion body.
  • the volume flow in the overflow channel can also be used advantageously according to the desired flow temperature e.g. controlled by a weather-compensated control.
  • the advantage of a precise flow temperature control would result from an inexpensive mixing device integrated in the boiler.
  • FIG. 1 shows a schematic illustration of a first embodiment of the heat generator with a cylindrical housing 27, in which a jacket 21, a front wall 22 and a rear wall 20 enclose a heating water chamber 4.
  • a heating gas chamber 24 is located in the heating water chamber 4 arranged, which can be closed on one side with a door 23 and on the other side has an outlet opening 25 for exhaust gas.
  • the door has an opening 26 for mounting a forced draft burner. Breakthroughs for the flow connection 7 and the return connection 10 are provided in the jacket 21.
  • a mixing chamber 16 is arranged downstream of the return connection 10, in which the cold return water is mixed with water from the heating water chamber 4 flowing from below through openings and then reaches the heating water chamber 4 preheated through the lateral openings 28.
  • the flow channel 3 connecting the heating water room 4 with the flow connection 7 is arranged.
  • the flow channel 3 is limited by the jacket 21 of the housing 27 and a half-shell shaped part 19.
  • an immersion sleeve 30 is shown, which is provided for receiving a temperature sensor, not shown here.
  • the heating water flows through the gap 29 formed between the rear wall 20 and the molded part 19 into the flow channel 3, along the immersion sleeve 30 and is fed to the heating circuit through the flow connection 7.
  • Fig. 2 shows schematically the cross section of the heat generator (first embodiment) according to the section line B-B shown in Fig. 1.
  • the immersion sleeve 30 which is also shown in FIG. 1, one can see three further immersion sleeves 31, 32, 33 arranged in the flow channel, which are used to hold further temperature sensors (e.g. temperature sensors for safety temperature limiters etc.).
  • Fig. 3 shows a schematic representation of a second embodiment of the heat generator with a cylindrical housing 27, in which a jacket 21, a front wall 22 and a rear wall 20 enclose a heating water chamber 4.
  • a heating gas chamber 24 is arranged in the heating water chamber 4, which can be closed with a door 23 on one side and has an outlet opening 25 for exhaust gas on the other side.
  • the door has an opening 26 for mounting a forced draft burner.
  • a molded part 18 arranged in the heating water chamber forms two supply channels 1, 2, two return channels 11, 12 and a mixing chamber 15 with the housing.
  • the channels 1, 2, 11, 12 run largely parallel to the casing 21 of the housing 27.
  • the supply channel 1, 2 is separated from the return channel 11, 12 by the beads 36, 38, 39.
  • Fig. 4 shows schematically the cross section of the heat generator (second embodiment) according to the section line A-A shown in Fig. 3.
  • the heat generator has two connecting pieces for the flow connection 5, 6 and two connecting pieces for the return connection 8, 9.
  • Fig. 5 shows the heating water supply for the second embodiment of the heat generator.
  • the housing of the heat generator and the connecting pieces for the flow connection and the return connection are not shown here.
  • the heating water enters via the return connection (arrow 8a) into the section of the return channel 11, 12 delimited by the bead 38 and bead 39 and then flows (e.g. arrow 12a) through the radial sections of the return channel 11, 12 into the mixing chamber 15 A partial mixing of the return water with the already heated heating water of the heating water chamber 4 takes place via the mixing openings 40 and the overflow opening 41.
  • heating water enters the flow channel 1, 2 via the junction 13, 14.
  • the heating water (arrow 1a, 2a) flows radially upwards and through the flow connection (arrow 5a) into the connected heating circuit.
  • a portion (arrow 1a) of the heating water is always forced past the immersion sleeves 30, 31, 32, 33, so that the temperature sensors in the immersion sleeves can function in the sense of a satisfactory operating behavior of the heat generator.
  • the overflow channel 17 connecting the flow channel 1, 2 with the return channel 11, 12 simultaneously fulfills the function of a ventilation opening between the channels 1, 2, 11, 12 in the second embodiment - Connection piece 34 are introduced.

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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)
  • Steam Or Hot-Water Central Heating Systems (AREA)
EP96111974A 1995-08-02 1996-07-25 Générateur de chaleur pour utilisation à des températures basses et procédé pour la mise en oeuvre du générateur de chaleur Withdrawn EP0757214A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19528353A DE19528353A1 (de) 1995-08-02 1995-08-02 Wärmeerzeuger für NT-Betrieb und Verfahren zum Betreiben des Wärmeerzeugers
DE19528353 1995-08-02

Publications (1)

Publication Number Publication Date
EP0757214A1 true EP0757214A1 (fr) 1997-02-05

Family

ID=7768490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96111974A Withdrawn EP0757214A1 (fr) 1995-08-02 1996-07-25 Générateur de chaleur pour utilisation à des températures basses et procédé pour la mise en oeuvre du générateur de chaleur

Country Status (2)

Country Link
EP (1) EP0757214A1 (fr)
DE (1) DE19528353A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0915304A2 (fr) * 1997-11-06 1999-05-12 VIESSMANN WERKE GmbH & CO. Chaudière à trois passages

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005002933B4 (de) * 2005-01-21 2008-01-17 Wieland-Werke Ag Wärmezelle für einen Warmwassererzeuger

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150827A (en) * 1961-10-24 1964-09-29 York Shipley Inc Apparatus for use in hot water heating systems
EP0302782A1 (fr) * 1987-08-03 1989-02-08 GEMINOX, Société Anonyme Corps de chaudière de chauffage à fluide caloporteur
DE9318836U1 (de) * 1993-12-08 1995-04-06 Metzner, Gerhard, Dipl.-Ing., 85579 Neubiberg Zentralheizungskessel für Öl-/Gasgebläsebrenner
EP0657704A1 (fr) * 1993-12-10 1995-06-14 Christian Dr.-Ing. Philipp Chauffe eau

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7011096U (de) * 1970-03-25 1970-07-16 Strebelwerk Gmbh Heizkessel.
DE3832320A1 (de) * 1988-09-23 1990-03-29 Omnical Gmbh Verfahren zur regelung eines zentralheizungskessels
DE4134374C2 (de) * 1991-10-17 1996-02-29 Viessmann Werke Kg Heizungsanlage mit Einrichtungen zur Vermeidung der Taupunktskorrosion
DE9318956U1 (de) * 1993-12-10 1994-02-10 Philipp, Christian, Dr.-Ing., 01896 Ohorn Einrichtung zur Rücklaufbeimischung in einem Heizkessel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150827A (en) * 1961-10-24 1964-09-29 York Shipley Inc Apparatus for use in hot water heating systems
EP0302782A1 (fr) * 1987-08-03 1989-02-08 GEMINOX, Société Anonyme Corps de chaudière de chauffage à fluide caloporteur
DE9318836U1 (de) * 1993-12-08 1995-04-06 Metzner, Gerhard, Dipl.-Ing., 85579 Neubiberg Zentralheizungskessel für Öl-/Gasgebläsebrenner
EP0657704A1 (fr) * 1993-12-10 1995-06-14 Christian Dr.-Ing. Philipp Chauffe eau

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0915304A2 (fr) * 1997-11-06 1999-05-12 VIESSMANN WERKE GmbH & CO. Chaudière à trois passages
EP0915304A3 (fr) * 1997-11-06 2001-05-02 VIESSMANN WERKE GmbH & CO. Chaudière à trois passages

Also Published As

Publication number Publication date
DE19528353A1 (de) 1997-02-06

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