EP1108963A2 - Echangeur de chaleur pour gaz de combustion - Google Patents

Echangeur de chaleur pour gaz de combustion Download PDF

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Publication number
EP1108963A2
EP1108963A2 EP00127480A EP00127480A EP1108963A2 EP 1108963 A2 EP1108963 A2 EP 1108963A2 EP 00127480 A EP00127480 A EP 00127480A EP 00127480 A EP00127480 A EP 00127480A EP 1108963 A2 EP1108963 A2 EP 1108963A2
Authority
EP
European Patent Office
Prior art keywords
flue gas
heat exchanger
transverse
transverse rib
exchanger according
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
EP00127480A
Other languages
German (de)
English (en)
Other versions
EP1108963A3 (fr
EP1108963B1 (fr
Inventor
Markus Jäger
Thomas Hartmann
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.)
Truma Geraetetechnik GmbH and Co KG
Original Assignee
Truma Geraetetechnik GmbH and Co KG
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 Truma Geraetetechnik GmbH and Co KG filed Critical Truma Geraetetechnik GmbH and Co KG
Publication of EP1108963A2 publication Critical patent/EP1108963A2/fr
Publication of EP1108963A3 publication Critical patent/EP1108963A3/fr
Application granted granted Critical
Publication of EP1108963B1 publication Critical patent/EP1108963B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • 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
    • F24H3/00—Air heaters
    • F24H3/006—Air heaters using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/10—Particular pattern of flow of the heat exchange media
    • F28F2250/102—Particular pattern of flow of the heat exchange media with change of flow direction

Definitions

  • the invention relates to a flue gas heat exchanger according to the preamble of claim 1.
  • Such a heat exchanger is, for. B. used in gas heaters generated by a gas flame and with the flue gas flow from the flame Extract heat to heat room air or water.
  • the hot flue gas flow is through a flue gas duct led while the medium to be heated on the outside of the Flue gas channel flows past.
  • Such a flue gas heat exchanger is known from DE 197 45 424 A1, where the flue gas is fed into a container via a flue gas inlet is in which several parallel to each other and in the direction of flow extending baffles are arranged, the flue gas in a serpentine Force the flow direction inside the tank until that Flue gas leaves the tank via a flue gas outlet. Because of the longer flow time of the flue gas and thus the longer dwell time In the container, the heat can be transferred to the outside of the tank more efficiently Containers existing medium are released.
  • FIG. 3 a plan view of the inside of a housing half-shell of a known heat exchanger shows.
  • An associated second housing shell is not shown, which is substantially symmetrical with the first housing shell and on which first housing shell can be placed.
  • a burner e.g. B. an atmospheric LPG burner can be applied.
  • Gas flame extends into a combustion chamber 2.
  • the combustion chamber 2 goes smoothly into a flue gas duct 3, the one above the flame arranged imaginary flue gas inlet 4 begins and at a flue gas outlet 5 ends.
  • an exhaust pipe not shown connectable, through which the flue gas is discharged to a chimney can.
  • the flue gas duct 3 runs between the flue gas inlet 4 and the Flue gas outlet 5 meandering and makes several 90 ° deflections, to achieve the longest possible path for the flue gas flow and one to enable compact construction of the heat exchanger.
  • ribs are on the outside of the two heat exchanger housing half-shells ribs, each not shown, are provided to the surface to the outside increase and thus the heat emission to the surrounding medium (here: the warming air). Furthermore, on the inside of the Housing half-shells provided a plurality of longitudinal ribs 6, which for a Enlargement of the inner surface of the heat exchanger and thus also ensure an increase in heat transfer.
  • the flue gas is through the Longitudinal ribs 6 guided in the direction of flow. Only at the deflection points no longitudinal ribs are provided. The large number of longitudinal ribs ensures for a clear channel narrowing and thus a delay in flow velocity, which also improves heat transfer.
  • a ceramic heat exchanger is known from DE 37 30 137 A1, at in a heat exchanger interior that is insulated from the outside of ceramic base plates parallel to and offset from each other are arranged. On the top of each base plate are across Ribs running flue gas flow arranged. Opposite spaces between the ribs are on the underside of an opposite one Base plate formed in the ceramic material of the base plate in each case pipelines, through which the medium to be heated flows. The surfaces of the Pipelines are in relation to the overall dimension of the heat exchanger low, so that only small amounts of heat can be transferred. Furthermore, the base plates are made of ceramic material, which is good corrosion resistance, but has only low heat conduction properties.
  • the invention is based on the object of a flue gas heat exchanger specify at least one degree of efficiency with a low cost of materials can be achieved, the efficiency of heat exchangers with longitudinal ribs.
  • the flue gas heat exchanger according to the invention is characterized in that that at least one of the inner walls of the flue gas duct Cross rib is provided, which is substantially perpendicular to a Extends the direction of flow of the flue gas.
  • Cross ribs provided on different inner walls of the flue gas duct are arranged.
  • the Cross ribs alternately on two opposite inner walls of the Flue gas duct arranged. This forces the flue gas flow meandering back and forth between the two housing shells, causing a noticeable lengthening of the mean flow path is achieved.
  • the number and spacing of the transverse ribs is advantageously chosen so that that the core flow, which initially breaks off when a transverse rib flows over it and swirled again to rest against the inner walls of the flue gas duct comes before it is disturbed again by the next cross rib.
  • the heat of the flue gas flow to the metallic one is particularly effective Lead outside wall of the flue gas duct, which causes the heat transfer is improved.
  • Fig. 1 shows the flue gas heat exchanger according to the invention in disassembled State in which two housing shells 10, 11 are separated from one another.
  • the two housing shells 10, 11 can be assembled on a fictitious line B folded up and by means of their flanges 12, 13 in a suitable and on are known to be connected to each other. Expediently a seal is inserted between the flanges 12 and 13 prior to assembly.
  • the housing shells 10, 11 are preferably made of cast aluminum manufactured.
  • the invention is not based on the assembled Heat exchanger, but based on the two open housing shells 10, 11 explained, the inside of which are clearly visible in FIG. 1.
  • the Burner is preferably operated with liquid gas and forms together with the heat exchanger is a heater that is particularly suitable for caravans.
  • the flame generated by the burner extends into a combustion chamber 15, which are seamlessly defined on one to explain the invention, but otherwise Flue gas inlet 16 into a flue gas duct that is not recognizable in terms of features 17 passes.
  • the flue gas duct 17 extends in a meandering shape in a riser 18, a first transverse channel 19, a first vertical Channel 20, a second transverse channel 21, a second vertical channel 22, a third transverse channel 23 and a third vertical channel 24 into one flue gas outlet 25 serving as an exhaust connection.
  • transverse ribs are provided in the course of the flue gas duct 17, namely a first transverse rib 26, a second transverse rib 27, a third transverse rib 28, a fourth transverse rib 29 and a fifth transverse rib 30.
  • Each of the transverse ribs 26 to 30 extends substantially perpendicular to one Flow direction of the flue gas and is in one piece with its long side molded onto an associated inner wall 31 or 32 of the housing shells 10, 11.
  • the end faces of the transverse ribs 26 to 30 run into the narrower ones Inner or side walls of the housing shells 10, 11.
  • the first, third and fifth transverse ribs 26, 28, 30 are on one housing shell 10 formed while the second and fourth transverse ribs 27, 29 the other housing shell 11 are provided. That means the cross ribs 26 to 30 alternately on the two opposite inner walls 31, 32 of the flue gas duct 17 are arranged. Due to the special arrangement the transverse ribs 26 to 30 take the one passing through the flue gas duct 17 Flue gas flow a serpentine course.
  • the as flow obstacles acting cross ribs 26 to 30 force the flue gas flow each in a different direction, opposite the transverse rib in question, whereby the flow at the cross rib breaks off and only in the further course, with a certain distance after the cross rib, to rest against the walls of the housing shells 10, 11 come through before the flue gas flow the next cross rib in the other direction, d. H. now to the opposite Housing shell, is deflected.
  • transverse ribs can be seen particularly well from FIG a section along the line A in Fig. 1, but in the assembled state of the heat exchanger shows.
  • FIG. 2 shows in particular the first, the second and the third transverse rib 26, 27, 28 recognizable, each alternately on the opposite inner walls are arranged.
  • the hot flowing up from the riser 18 Flue gas flow is in the first after the flue gas duct 17 has been bent
  • Cross channel 19 first from the first transverse rib 26 in the direction of the housing shell 11 deflected before passing through the second transverse rib 27 in the direction the other housing shell 10 is forced.
  • the third transverse rib 28 in turn redirects the flue gas flow towards the housing shell 11.
  • transverse ribs which extend from the side, narrower inner walls of the housing shells, however, only occupy part of the width of the flue gas duct.
  • both casing shells consequently have inner ribs at the same point, which, however, only cover part of the canal.
  • the transverse ribs can be arranged such that they are screw-shaped or vortex-shaped Force the course of the flue gas flow.
  • the transverse ribs are in Form of crosspieces provided that the flue gas flow from the center of the Displace the flue gas duct to the side walls.
  • the number and arrangement of the transverse ribs 26 to 30 is for the function of the Heat exchanger, d. H. especially for reliable cold start behavior and crucial for optimizing heat transfer.
  • the number of five transverse ribs has been shown in numerous laboratory tests proven to be particularly useful, since it is precisely this division that ensures is that the core flow always goes over a cross rib comes fully back to the side walls, d. H. the spatial distance between the transverse ribs is large enough.
  • a larger number of cross ribs would only increase the heat exchanger weight lead, but no noticeable improvement in efficiency or Heat distribution on the outside of the housing shells 10, 11 cause. With A smaller number of cross ribs can provide the desired heat distribution not be adjusted as well anymore.
  • the transverse ribs 26 to 30 should be arranged in the flue gas duct 17 in this way be that on the outside of the heat exchanger as uniform as possible Temperature curve is reached.
  • the position is particularly important the first transverse rib 26, which is flown by the flue gas with the highest temperature becomes.
  • the first transverse rib 26 is located in the first transverse channel 19, ie immediately after the riser 18 of the heat exchanger, in the the flue gas is the hottest.
  • the flow velocity is determined by the first transverse rib 26 significantly reduced, so the hot flue gases last longer Linger time in riser 18, which resulted in a significantly improved Heat transfer leads.
  • the first transverse rib 26 must not be directly on the Deflection from the riser 18 to the first transverse channel 19, to prevent the hot flue gases from burning. As optimal a position for the first transverse rib 26 after approximately one fifth to one Quarter of the total length of the transverse channel 19 result.
  • the second transverse rib 27 is shortly before the transition of the first transverse channel 19 provided in the first vertical channel 20, because there is still a vertical impact of the flue gas flow is possible, which makes it special high heat transfer coefficients can be achieved.
  • the third transverse rib 28 is in the transition between the first vertical Channel 20 and the second transverse channel 21 arranged and facing the second Cross rib 27 at about the same distance, i.e. H. mean flow path length, like the second transverse rib 27 to the first transverse rib 26.
  • the fourth transverse rib 29 is exactly in the middle of the third transverse channel 23 with approximately the same Distance to the third transverse rib 28 is arranged.
  • the fifth transverse rib 30 in turn points to the fourth transverse rib 29 the same distance as the previous transverse ribs 26 to 29 and is positioned immediately in front of the flue gas outlet 25. To achieve a the flow onto the transverse ribs 26 to 30 should have good heat transfer as vertical as possible.
  • the height of the transverse ribs plays an important role in terms of starting behavior, efficiency, maximum heat exchanger temperatures and low pollutant emissions in the different operating modes.
  • Height means the value around which a cross rib touches the one with its long side Raises inner wall of the housing shells 10, 11.
  • the height of the cross ribs 26 to 30 is the cross section of the flue gas duct 17 on the relevant one Places significantly reduced, which increases the flow resistance.
  • the height of each of the transverse ribs 26 to 30 is such that none Cross rib more than half of the flue gas duct cross section on the relevant one Spot covers. The transverse ribs 26 to 30 should therefore not be higher than the flue gas duct depth in the associated housing shell 10, 11.
  • the current effect leads to a recirculation area and therefore very small heat transfer coefficients.
  • the pronounced recirculation area leads downstream from the transverse rib the proximity of the re-application point of the flow to a maximum heat transfer, d. H. at these positions, a lot of heat is released to the outside headed.
  • the transverse rib 34 is perpendicular to the direction of flow of the flue gas and has an upper edge rising towards one side of the flue gas duct 33 as well as two openings. Flue gas is selectively swirled through the openings, to get a changed heat transfer.
  • the transverse rib 35 is slightly curved in relation to the direction of flow. She is still essentially perpendicular to the direction of flow. Similar thing applies to the transverse rib 36, which consists of two mutually angular Sections exists. Even if they are no longer exactly perpendicular to the direction of flow of the flue gas, a similar effect can be achieved with it.
  • transverse ribs 35 and 36 As an alternative to the transverse ribs 35 and 36, the transverse ribs 37 and 38 are shown where the transverse ribs are each by a serpentine or zigzag course.
  • the cross rib 39 finally stands obliquely in the flue gas duct 33. Although it does not have a section that is exactly perpendicular to the flow direction of the Is flue gas, this transverse rib 39 should also be substantially vertical be viewed standing. In any case, also with the sloping one Cross rib 39 to achieve an effect according to the invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP00127480A 1999-12-17 2000-12-14 Echangeur de chaleur pour gaz de combustion Expired - Lifetime EP1108963B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19961133A DE19961133C1 (de) 1999-12-17 1999-12-17 Rauchgas-Wärmetauscher
DE19961133 1999-12-17

Publications (3)

Publication Number Publication Date
EP1108963A2 true EP1108963A2 (fr) 2001-06-20
EP1108963A3 EP1108963A3 (fr) 2003-01-08
EP1108963B1 EP1108963B1 (fr) 2005-09-21

Family

ID=7933187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00127480A Expired - Lifetime EP1108963B1 (fr) 1999-12-17 2000-12-14 Echangeur de chaleur pour gaz de combustion

Country Status (2)

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EP (1) EP1108963B1 (fr)
DE (2) DE19961133C1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1537780B1 (fr) * 2001-10-04 2008-08-13 American Biophysics Corporation Dispositif pour capturer des insectes volants, et méthode pour le fabriquer
CA2460876C (fr) * 2001-10-04 2009-08-25 American Biophysics Corp. Systeme permettant de pieger des insectes volants et procede permettant de fabriquer ledit systeme
AU2003287146A1 (en) 2002-10-18 2004-05-13 American Biophysics Corp. System for trapping flying insects and a method for making the same
EP2051006A1 (fr) * 2007-10-19 2009-04-22 Truma Gerätetechnik GmbH & Co. KG Appareil de chauffage
AU201712794S (en) 2016-11-23 2017-05-23 Dometic Sweden Ab Ventilation and air conditioning apparatus
DE112018005883T5 (de) 2017-11-16 2020-07-30 Dometic Sweden Ab Klimatisierungsvorrichtung für wohnmobile
KR102546993B1 (ko) * 2018-07-26 2023-06-22 엘지전자 주식회사 가스 난방기
USD905217S1 (en) 2018-09-05 2020-12-15 Dometic Sweden Ab Air conditioning apparatus
DE102018007129A1 (de) 2018-09-10 2020-03-12 Truma Gerätetechnik GmbH & Co. KG Rauchgas-Wärmetauscher und Heizvorrichtung mit Rauchgas-Wärmetauscher

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3730137A1 (de) 1987-09-05 1989-03-16 Rudolf Justl Gmbh Keramischer waermetauscher
DE19745424A1 (de) 1997-09-03 1999-03-04 Vitalij Farfurak Gerät zur Ausnutzung der Abwärme von konventionellen Heizanlagen

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1454296B1 (de) * 1963-10-17 1972-03-09 Kreis Philipp Mit gasfoermigem oder vergastem fluessigem Brennstoff befeuertes Raumheizgeraet fuerKleinraeume,insbesondere Wohnwagen
US3399661A (en) * 1967-06-19 1968-09-03 Kreis Philipp Gas or liquid fuel fired space heater
DE2016560C3 (de) * 1970-04-07 1974-06-27 Philipp 8000 Muenchen Kreis Raumheizgerät für Kleinräume
US3870052A (en) * 1973-04-05 1975-03-11 Bettcher Manufacturing Corp Oil-fired radiant space heater
DE3100206A1 (de) * 1981-01-07 1982-08-12 Peter 7823 Bonndorf Stadler Verfahren und vorrichtung zur rueckgewinnung von waerme aus abgasen
US4421095A (en) * 1981-09-28 1983-12-20 Philipp Kreis Gmbh & Co. Room heating apparatus for small spaces
EP0111538A4 (fr) * 1982-06-10 1985-02-28 Edwin A Price Echangeur thermique du type a ailettes.
DE3328591C1 (de) * 1983-08-08 1984-10-31 Philipp Kreis GmbH & Co Truma-Gerätebau, 8000 München Raumheizgeraet fuer Kleinraeume
DE3672611D1 (de) * 1986-07-29 1990-08-16 Kreis Truma Geraetebau Raumheizgeraet fuer kleinraeume.
DE3633236A1 (de) * 1986-09-30 1988-04-07 Kreis Truma Geraetebau Raumheizgeraet fuer kleinraeume
US4982785A (en) * 1990-03-06 1991-01-08 Inter-City Products Corporation (Usa) Serpentine heat exchanger
BE1006365A5 (fr) * 1992-11-23 1994-08-02 Saint Roch Couvin Sa Nv Chaudiere atmospherique a gaz pour chauffage central.
DE4432284A1 (de) * 1994-09-09 1996-03-14 Zink Helmut Luft-/Gaswärmetauscher

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3730137A1 (de) 1987-09-05 1989-03-16 Rudolf Justl Gmbh Keramischer waermetauscher
DE19745424A1 (de) 1997-09-03 1999-03-04 Vitalij Farfurak Gerät zur Ausnutzung der Abwärme von konventionellen Heizanlagen

Also Published As

Publication number Publication date
DE19961133C1 (de) 2001-04-26
EP1108963A3 (fr) 2003-01-08
EP1108963B1 (fr) 2005-09-21
DE50011206D1 (de) 2006-02-02

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