EP0546328B1 - Heat exchange system for the heating of water for central heating and water for domestic use - Google Patents

Heat exchange system for the heating of water for central heating and water for domestic use Download PDF

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Publication number
EP0546328B1
EP0546328B1 EP19920119097 EP92119097A EP0546328B1 EP 0546328 B1 EP0546328 B1 EP 0546328B1 EP 19920119097 EP19920119097 EP 19920119097 EP 92119097 A EP92119097 A EP 92119097A EP 0546328 B1 EP0546328 B1 EP 0546328B1
Authority
EP
European Patent Office
Prior art keywords
water
tube
ribbed
inner tube
exchange system
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.)
Expired - Lifetime
Application number
EP19920119097
Other languages
German (de)
French (fr)
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EP0546328A1 (en
Inventor
Klaus Dipl.-Ing. Menze
Johann Dipl.-Ing. Gschaider (Fh)
Bernd Dipl.-Ing. Dautel
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.)
Wieland Werke AG
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Wieland Werke AG
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Filing date
Publication date
Application filed by Wieland Werke AG filed Critical Wieland Werke AG
Publication of EP0546328A1 publication Critical patent/EP0546328A1/en
Application granted granted Critical
Publication of EP0546328B1 publication Critical patent/EP0546328B1/en
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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
    • F24H1/526—Pipes in pipe heat exchangers for sanitary 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F24H1/43—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled
    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water

Definitions

  • the invention relates to a heat exchange system according to the preamble of claims 1 and 2 respectively.
  • the invention is therefore based on the object of designing a heat exchange system of the type mentioned in such a way that consequent condensing operation is made possible.
  • the heat-exchanging surfaces are designed according to the invention in such a way that the surface temperature comes to lie on the finned outside of the outer tube in such a way that the water vapor contained in the exhaust gas can condense on this surface. In this way, the heat of condensation is gained.
  • EP-A-0.133.604 deals with the recovery of the heat of condensation in a similar heat exchange system, but the parameter ranges according to the invention are not disclosed.
  • the inner tube can have a single or cross knurled structure on the outside instead of ribbing with a knurled height of 0.3-1.5 mm.
  • the fins are notched, slotted or bent.
  • finned tube and / or inner tube can be replaced by a corrugated tube (tube with constant wall thickness).
  • the burner designed to be rotationally symmetrical is surrounded by a helically or conically wound heat exchanger.
  • a reflecting wall is preferably installed on the side of the finned tube which is remote from the burner.
  • the heat exchange system according to the invention provides a specifically very powerful combination heat exchanger which is also compact and inexpensive to manufacture. Another advantage of the proposed heat exchanger is that it can be removed and installed with just a few simple steps if the heat exchange system is designed accordingly, which accommodates both cleaning and any replacement that may be required after a damage event.
  • FIG. 1 schematically shows the part of a gas-heated heat exchange system 1, in the combustion chamber 2 of which a cylindrical burner 3 is surrounded by a heat exchanger 4 in the form of a helically wound finned tube 5 with ribs on the outside.
  • the emerging exhaust gases are labeled 3 '.
  • the structure of the heat exchanger 4 in detail is shown in Fig.2a / 2b.
  • a concentric inner tube 6 is arranged here, so that an annular space 7 is formed.
  • Process water (BW) is guided in the inner pipe 6, while the heating water (HW) flows through the annular space 7 in cocurrent or countercurrent.
  • both the heat transfer surface flue gas / finned tube 5 and the other three heat transfer surfaces are structured.
  • the finned tube 5 has on the outside helical ribs 8 of the rib height H R , the inside is corrugated (corrugated depth w 1).
  • the inner tube 6 is here also shown with helical outer ribs 9 of the rib height h R.
  • the inner fins of the inner tube 6 are numbered 10 (fin height e).
  • the inside can be corrugated with the corrugation depth w2 (not shown).
  • a reflective wall 11 is installed on the side of the finned tube 5 facing away from the burner. This can be located directly behind the finned tube 5 and in contact with it, as well as at some distance and in the form of a combustion chamber wall.

Description

Die Erfindung betrifft ein Wärmeaustauschsystem nach dem Oberbegriff des Anspruchs 1 bzw. 2.2. The invention relates to a heat exchange system according to the preamble of claims 1 and 2 respectively.

Mit Gas beheizte Geräte zur Erwärmung von Wasser sind seit langem bekannt. Zudem ist aus der EP-A-0.385.700 ein Wärmeaustauschsystem zur gleichzeitigen Erwärmung von Heiz- und Brauchwasser bekannt, wobei über einen evtl. Brennwertbetrieb allerdings keine Angaben gemacht werden (unter Brennwertbetrieb ist hierbei - wie allgemein üblich - die Nutzung der Kondensationswärme des bei der Verbrennung entstehenden Wasserdampfes durch ausreichend kalte Wärmeaustauschoberflächen zu verstehen).Gas-heated devices for heating water have been known for a long time. In addition, from EP-A-0.385.700 a heat exchange system for the simultaneous heating of heating and service water is known, although no information is given about a possible condensing operation (under condensing operation here - as is generally the case - the use of the condensation heat of the the combustion of water vapor caused by sufficiently cold heat exchange surfaces).

Der Erfindung liegt daher die Aufgabe zugrunde, ein Wärmeaustauschsystem der genannten Art so zu gestalten, daß ein konsequenter Brennwertbetrieb ermöglicht wird.The invention is therefore based on the object of designing a heat exchange system of the type mentioned in such a way that consequent condensing operation is made possible.

Diese Aufgabe wird erfindungsgemäß durch die jeweils in den kennzeichnenden Teilen der Ansprüche 1 und 2 angegebenen Merkmale gelöst. Die wärmeaustauschenden Flächen werden erfindungsgemäß so gestaltet, daß die Oberflächentemperatur auf der berippten Außenseite des Außenrohres so zu liegen kommt, daß der im Abgas enthaltene Wasserdampf an dieser Fläche kondensieren kann. Damit wird die Kondensationswärme nutzbringend gewonnen.This object is achieved by the features specified in the characterizing parts of claims 1 and 2, respectively. The heat-exchanging surfaces are designed according to the invention in such a way that the surface temperature comes to lie on the finned outside of the outer tube in such a way that the water vapor contained in the exhaust gas can condense on this surface. In this way, the heat of condensation is gained.

In der EP-A-0.133.604 wird zwar bei einem ähnlichen Wärmeaustauschsystem u.a. auf die Rückgewinnung der Kondensationswärme eingegangen, die erfindungsgemäßen Parameterbereiche werden jedoch nicht offenbart.EP-A-0.133.604 deals with the recovery of the heat of condensation in a similar heat exchange system, but the parameter ranges according to the invention are not disclosed.

Nach einer weiteren Ausgestaltung der Erfindung kann das Innenrohr auf der Außenseite statt einer Berippung eine Einfach- oder Kreuzrändelstruktur bei einer Rändelhöhe von 0,3 - 1,5 mm aufweisen.According to a further embodiment of the invention, the inner tube can have a single or cross knurled structure on the outside instead of ribbing with a knurled height of 0.3-1.5 mm.

Um die Wärmeübertragung am Rippenrohr weiter zu verbessern, wird weiterhin vorgeschlagen, daß die Rippen gekerbt, geschlitzt oder abgekröpft sind.In order to further improve the heat transfer on the finned tube, it is further proposed that the fins are notched, slotted or bent.

Nach einer erfindungsgemäßen Alternative können Rippenrohr und/oder Innenrohr durch ein Wellrohr (Rohr mit konstanter Wanddicke) ersetzt werden.According to an alternative according to the invention, finned tube and / or inner tube can be replaced by a corrugated tube (tube with constant wall thickness).

Nach bevorzugten Ausführungsformen der Erfindung ist der rotationssymmetrisch (zylindrisch bzw. kegelförmig) ausgebildete Brenner von einem wendelförmig bzw. kegelförmig gewickelten Wärmeaustauscher umgeben.According to preferred embodiments of the invention, the burner designed to be rotationally symmetrical (cylindrical or conical) is surrounded by a helically or conically wound heat exchanger.

Um die vom zentralen Brenner ausgehende und zwischen den Außenrippen des Rippenrohres durchtretende Strahlung auf den Wärmetaustauscher zurückzuwerfen, wird vorzugsweise auf der brennerabgewandten Seite des Rippenrohres eine reflektierende Wand installiert.In order to reflect the radiation emanating from the central burner and passing between the outer fins of the finned tube onto the heat exchanger, a reflecting wall is preferably installed on the side of the finned tube which is remote from the burner.

Insgesamt wird mit dem erfindungsgemäßen Wärmeaustauschsystem ein spezifisch sehr leistungsfähiger Kombinationswärmeaustauscher zur Verfügung gestellt, der zudem kompakt ist und preiswert herstellbar ist. Ein weiterer Vorteil des vorgeschlagenen Wärmetaustauschers liegt darin, daß er bei entsprechender Konzeption des Wärmeaustauschsystems mit wenigen Handgriffen aus- und eingebaut werden kann, was sowohl der Reinigung wie einem eventuell erforderlichen Austausch nach einem Schadensfall entgegenkommt.Overall, the heat exchange system according to the invention provides a specifically very powerful combination heat exchanger which is also compact and inexpensive to manufacture. Another advantage of the proposed heat exchanger is that it can be removed and installed with just a few simple steps if the heat exchange system is designed accordingly, which accommodates both cleaning and any replacement that may be required after a damage event.

Die Erfindung wird an Hand des folgenden Ausführungsbeispiels näher erläutert. Es zeigt

Fig.1
schematisch den Brennraum eines gasbeheizten Wärmaustauschsystems,
Fig.2a
einen Längsschnitt durch den (gestreckt gedachten) Wärmetaustauscher und
Fig.2b
einen Querschnitt durch den wärmeaustauscher.
The invention is explained in more detail using the following exemplary embodiment. It shows
Fig. 1
schematically the combustion chamber of a gas-heated heat exchange system,
Fig.2a
a longitudinal section through the (stretched) heat exchanger and
Fig.2b
a cross section through the heat exchanger.

In Fig.1 ist schematisch der Teil eines gasbeheizten Wärmeaustauschsystems 1 gezeigt, in dessen Brennraum 2 ein zylindrischer Brenner 3 von einem wärmeaustauscher 4 in Form eines wendelförmig gewickelten, auf der Außenseite berippten Rippenrohres 5 umgeben ist. Die austretenden Abgase sind mit 3' bezeichnet. Der Aufbau des Wärmetaustauschers 4 im einzelnen ist in Fig.2a/2b gezeigt. Im Rippenrohr 5 ist hier ein konzentrisches Innenrohr 6 angeordnet, so daß ein Ringraum 7 gebildet wird. Im Innenrohr 6 wird Brauchwasser (BW) geführt, während der Ringraum 7 vom Heizwasser (HW) im Gleich- oder Gegenstrom durchflossen wird. Um einen konsequenten Brennwertbetrieb zu ermöglichen, sind sowohl die Wärmeübertragungsfläche Abgas/Rippenrohr 5 als auch die übrigen drei Wärmeübertragungsflächen (Rippenrohr 5 / Heizwasser (HW), Heizwasser (HW) / Innenrohr 6, Innenrohr 6 / Brauchwasser (BW)) strukturiert. So weist das Rippenrohr 5 auf der Außenseite schraubenlinienfömig umlaufende Rippen 8 der Rippenhöhe HR auf, die Innenseite ist gewellt (Welltiefe w₁).1 schematically shows the part of a gas-heated heat exchange system 1, in the combustion chamber 2 of which a cylindrical burner 3 is surrounded by a heat exchanger 4 in the form of a helically wound finned tube 5 with ribs on the outside. The emerging exhaust gases are labeled 3 '. The structure of the heat exchanger 4 in detail is shown in Fig.2a / 2b. In the finned tube 5, a concentric inner tube 6 is arranged here, so that an annular space 7 is formed. Process water (BW) is guided in the inner pipe 6, while the heating water (HW) flows through the annular space 7 in cocurrent or countercurrent. In order to enable consistent condensing operation, both the heat transfer surface flue gas / finned tube 5 and the other three heat transfer surfaces (finned tube 5 / heating water (HW), heating water (HW) / inner tube 6, inner tube 6 / process water (BW)) are structured. Thus, the finned tube 5 has on the outside helical ribs 8 of the rib height H R , the inside is corrugated (corrugated depth w 1).

Das Innenrohr 6 ist hier ebenfalls mit schraubenlinienförmig umlaufenden Außenrippen 9 der Rippenhöhe hR dargestellt. Die Innenrippen des Innenrohres 6 sind mit 10 beziffert (Rippenhöhe e). Alternativ kann die Innenseite mit der Welltiefe w₂ gewellt sein (nicht dargestellt).The inner tube 6 is here also shown with helical outer ribs 9 of the rib height h R. The inner fins of the inner tube 6 are numbered 10 (fin height e). Alternatively, the inside can be corrugated with the corrugation depth w₂ (not shown).

Zur besseren Ausnutzung der zwischen den Außenrippen 8 des Rippenrohres 5 hindurchtretenden Strahlung ist auf der brennerabgewandten Seite des Rippenrohres 5 eine reflektierende Wand 11 installiert. Diese kann sich direkt hinter dem Rippenrohr 5 und in Kontakt mit diesem befinden wie auch in einigem Abstand und als Brennraumwand ausgebildet sein.To make better use of the radiation passing between the outer fins 8 of the finned tube 5, a reflective wall 11 is installed on the side of the finned tube 5 facing away from the burner. This can be located directly behind the finned tube 5 and in contact with it, as well as at some distance and in the form of a combustion chamber wall.

Claims (8)

  1. Heat exchange system (1) for simultaneous heating of water for central heating (HW) and domestic water (BW), which has in a combustion chamber (2) a burner (3) which for its part is surrounded by a water-ducting heat exchanger (4) in the form of a coiled ribbed tube (5) which is ribbed on the outside, wherein an inner tube (6) is disposed in the ribbed tube (5), domestic water is ducted in the inner tube (6) and water for central heating (HW) is ducted in the annular space (7), and wherein at least two of the three heat transfer surfaces (ribbed tube 5 / water for central heating (HW), water for central heating (HW) / inner tube (6), inner tube (6) / domestic water (BW)) are structured or ribbed, characterised in that the ribbed tube (5) has 5 - 20 ribs (8) / inch running round helically on the outside with a rib height HR = 1.5 - 15 mm, the inner tube (6) has 5 - 20 ribs (9) / inch running round helically on the outside with a rib height hR = 0.3 - 3.0 mm, and the ribbed tube (5) and/or the inner tube (6) in each case have 0.5 - 5 inner ribs (10) per mm internal diameter of the tube running round helically on the outside with a rib height e = 0.1 - 0.6 mm and with an angle of twist of 15 - 45°.
  2. Heat exchange system (1) for simultaneous heating of water for central heating (HW) and domestic water (BW), which has in a combustion chamber (2) a burner (3) which for its part is surrounded by a water-ducting heat exchanger (4) in the form of a coiled ribbed tube (5) which is ribbed on the outside, wherein an inner tube (6) is disposed in the ribbed tube (5), domestic water is ducted in the inner tube (6) and water for central heating (HW) is ducted in the annular space (7), and wherein at least two of the three heat transfer surfaces (ribbed tube 5 / water for central heating (HW), water for central heating (HW) / inner tube (6), inner tube (6) / domestic water (BW)) are structured or ribbed, characterised in that the ribbed tube (5) has 5 - 20 ribs (8) / inch running round helically on the outside with a rib height HR = 1.5 - 15 mm, the inner tube (6) has 5 - 20 ribs (9) / inch running round helically on the outside with a rib height hR = 0.3 - 3.0 mm, and the ribbed tube (5) and/or the inner tube (6) are in each case corrugated with 5 - 20 corrugations/inch with a depth of corrugation w₁ / w₂ = 0.07 - 0.7 mm.
  3. Heat exchange system as claimed in Claim 1 or 2, characterised in that the inner tube (6) has on the outside instead of ribs a simple or cross-knurled structure with a knurling height of 0.3 - 1.5 mm.
  4. Heat exchange system as claimed in one or more of Claims 1 to 3, characterised in that the ribs (8) are notched, slotted or angled.
  5. Heat exchange system as claimed in one or more of Claims 1 to 4, characterised in that the ribbed tube (5) and/or the inner tube (6) are constructed as a corrugated tube.
  6. Heat exchange system as claimed in one or more of Claims 1 to 5, characterised in that the cylindrically constructed burner (3) is surrounded by a helically or conically coiled heat exchanger (4).
  7. Heat exchange system as claimed in one or more of Claims 1 to 5, characterised in that the conically constructed burner (3) is surrounded by a helically or conically coiled heat exchanger (4).
  8. Heat exchange system as claimed in one or more of Claims 1 to 7, characterised in that a reflecting wall (11) is disposed on the side of the ribbed tube (5) facing away from the burner.
EP19920119097 1991-12-13 1992-11-07 Heat exchange system for the heating of water for central heating and water for domestic use Expired - Lifetime EP0546328B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4141136 1991-12-13
DE19914141136 DE4141136C2 (en) 1991-12-13 1991-12-13 Heat exchange system for heating heating and process water

Publications (2)

Publication Number Publication Date
EP0546328A1 EP0546328A1 (en) 1993-06-16
EP0546328B1 true EP0546328B1 (en) 1995-05-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920119097 Expired - Lifetime EP0546328B1 (en) 1991-12-13 1992-11-07 Heat exchange system for the heating of water for central heating and water for domestic use

Country Status (4)

Country Link
EP (1) EP0546328B1 (en)
DE (2) DE4141136C2 (en)
DK (1) DK0546328T3 (en)
ES (1) ES2074796T3 (en)

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Publication number Priority date Publication date Assignee Title
CN101846464B (en) * 2008-12-16 2012-08-29 费罗利公司 Spiral heat exchanger for producing heating and/or sanitary use hot water, specifically designed for condensation applications

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DE19940222B4 (en) * 1998-08-25 2009-12-31 Vaillant Gmbh water heater
ITRM20010474A1 (en) * 2001-08-03 2003-02-03 Fontecal S P A HIGH YIELD SPIROIDAL HEAT EXCHANGER FOR HEATING AND / OR PRODUCTION OF DOMESTIC HOT WATER, PARTICULARLY SUITABLE FOR CONDENSING
GB2441183B (en) * 2007-04-16 2009-04-08 Enertek Internat Ltd Heat exchanger
DE102008012126A1 (en) * 2008-03-01 2009-09-10 Robert Bosch Gmbh heater
ITMI20100590A1 (en) * 2010-04-08 2011-10-09 Riello Spa HEAT EXCHANGER TO HEAT AT LEAST TWO LIQUIDS AND METHOD TO REALIZE THIS HEAT EXCHANGER
PL223959B1 (en) * 2012-03-23 2016-11-30 Aic Spółka Akcyjna Dual heat exchanger
GB201610729D0 (en) * 2016-06-20 2016-08-03 Evans Peter And Sallaku Arben Boiler
CN110274399B (en) * 2019-06-28 2021-12-03 台州市余华纸箱有限公司 Heating device capable of being automatically cleaned and used on solar water heater

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FR1392532A (en) * 1963-11-28 1965-03-19 Caravan heating boiler
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101846464B (en) * 2008-12-16 2012-08-29 费罗利公司 Spiral heat exchanger for producing heating and/or sanitary use hot water, specifically designed for condensation applications

Also Published As

Publication number Publication date
EP0546328A1 (en) 1993-06-16
DE4141136C2 (en) 1996-04-25
DE59202337D1 (en) 1995-06-29
DK0546328T3 (en) 1995-10-02
DE4141136A1 (en) 1993-06-17
ES2074796T3 (en) 1995-09-16

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