EP0493665B1 - Echangeur de chaleur et procédé de production d'une lamelle pour un échangeur de chaleur - Google Patents

Echangeur de chaleur et procédé de production d'une lamelle pour un échangeur de chaleur Download PDF

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Publication number
EP0493665B1
EP0493665B1 EP91119203A EP91119203A EP0493665B1 EP 0493665 B1 EP0493665 B1 EP 0493665B1 EP 91119203 A EP91119203 A EP 91119203A EP 91119203 A EP91119203 A EP 91119203A EP 0493665 B1 EP0493665 B1 EP 0493665B1
Authority
EP
European Patent Office
Prior art keywords
cutouts
heat exchanger
lamella
exchanger according
hot
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
EP91119203A
Other languages
German (de)
English (en)
Other versions
EP0493665A2 (fr
EP0493665B2 (fr
EP0493665A3 (en
Inventor
Ernst Dipl.-Ing. Schmidt
Manfred Dipl.-Ing. Seebauer (Fh)
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
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0493665A2 publication Critical patent/EP0493665A2/fr
Publication of EP0493665A3 publication Critical patent/EP0493665A3/de
Publication of EP0493665B1 publication Critical patent/EP0493665B1/fr
Application granted granted Critical
Publication of EP0493665B2 publication Critical patent/EP0493665B2/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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F28F1/325—Fins with openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators

Definitions

  • the invention relates to a heat exchanger according to the preamble of the main claim.
  • a heat exchanger of this type AT-A-391 022 in order to bring the exhaust gas temperature to a level sufficient to prevent condensation, a variable number of detachable fins is present.
  • the walls of the lamellae extending between adjacent tubes be made removable in some areas in order to reduce their heat-transferring area as required and thereby increase the exhaust gas temperature.
  • recesses are provided in the lamella, which enclose the break-out wall parts with the exception of small webs and enable mechanical break-out.
  • This version requires subsequent processing of the fully assembled heat exchanger.
  • different types of slats are required, such as fixed and detachable slats or slats with breakable wall parts.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the heat flow can be influenced by the recesses in such a way that a predeterminable temperature gradient is formed along the lamella in the flow direction. Areas of widely differing temperatures can be avoided and the maximum temperature difference at the opposite ends of the lamella can be kept small.
  • a web between the recesses which connects the upstream edge of the slat directly to the lower edge of a hot water pipe, causes an uninterrupted heat flow in the axis of the slat and reduces scaling at the slat base.
  • the stability of the lamella increases, which can thereby be better assembled and soldered.
  • the corrosion behavior can be improved by reducing the temperature gradient in the flow direction of the exhaust gas.
  • a saving in tool and storage costs can be achieved if recesses for controlling the heat flow are punched into a uniform base plate.
  • the cutouts can be varied in size, shape and position so that fins for heat exchangers of different performance categories can be produced.
  • FIG. 1 shows a side view of a heat exchanger
  • FIG. 2 shows a top view of the heat exchanger, partly cut along line 11-11 in FIG. 1.
  • FIG. 3 shows a lamella
  • FIG. 4 shows a configuration of the cutouts. 5a to e show designs of different cutouts and
  • FIG. 5f shows a variant of the hot water pipe according to FIG. 1.
  • FIG. 1 shows a second-circuit heat exchanger 10 with a process water pipe coil 14 guided in the heating water pipes 12.
  • the water flows through an inlet 15 through an upper coil 16, consisting of pipes 17 and horizontal elbows 18, over one vertical elbow 19 in a lower coil 20, consisting of tubes 21 and horizontal elbows (not shown in the drawing) and from there via an outlet 24 into the domestic water network, not shown.
  • the heating circuit which can be operated without external circulation, essentially consists of an inlet chamber 26, a collecting or deflection chamber 27, an outlet chamber 28 and a heating network, not shown.
  • the chambers 26 and 27 or 27 and 28 are each connected to one another via parallel heating water pipes 12.
  • the hot water pipe coil 14 is supported against the heating water pipes 12 by means of copper profile rails 30.
  • the copper profile rails 30 can be inserted on both sides between the upstream edge of the heating water tube 12 and the tubes 21 of the lower coil 20 and the tubes 17 of the upper coil 16 and the downstream end of the heating water tubes 12 (FIG. 1) or only in the upstream region (FIG. 5f), the tubes 17 of the upper coil 16 are pressed directly onto the downstream edge of the heating water tubes 12.
  • the copper profile rails 30 the heat flows directly from the fins 32 to the process water pipes 21, so that boiling noises can be avoided in the case of dual-circuit heat exchangers for heating circuits without external circulation.
  • the heating water pipes 12 are surrounded by a plurality of fins 32, which have passages 34 which are adapted to the shape of the heating water pipes and accommodate them. There are recesses 40, 41 between the edge 36 on the exhaust gas inflow side and the edge 38 of the passage 34 on the exhaust gas side, between which a web 42 is formed.
  • the fins 32 can be made of copper or other materials. When copper is used, the heat spreading on the lamella 32 can be hindered by the cutouts in such a way that, despite the high thermal conductivity coefficient of copper, no regions with temperatures below the dew point temperature are formed.
  • the shape of the cutouts 40, 41 is matched to the shape of the edge 38 on the exhaust gas inflow side and runs at a distance 44 therefrom.
  • the opening angles 0: 1 and a 2 seen from the lower center 46 limit the cutouts 40, 41 and the web 42 in the circumferential direction.
  • cutouts 48 are made in the lamella 32 on the edge 50 on the exhaust gas downstream side. These are triangular in shape, have a corner in the middle of the slats and are positioned symmetrically between the passages 34.
  • the size of the area of the recesses 48 is determined by the power of the water heater in which the heat exchanger equipped with these fins is installed.
  • FIG. 5 shows further possible shapes and positions for the cutouts 40, 41 controlling the heat flow and the cutout 48 for adjusting the output.
  • FIG. 5a shows a cutout 60 in the shape of an arc
  • FIG. 5b shows an arcuate cutout 62 with a web
  • FIG. 5c shows an arcuate cutout 64 with two webs 65.
  • FIG. 5d there is a straight cutout 66 and in FIG. recesses 68 distributed in the arc are shown.
  • the recesses provided for power adjustment can be triangular in shape 70, rectangular in shape 71 to 73 or round in shape 74 and can be introduced both on the edge 36 on the exhaust gas inflow side, the edge 50 on the exhaust gas outflow side and in the middle of the lamella, it not being necessary Always position the recesses 70 to 74 between the passages. It is also possible to combine several different shapes.
  • the lamella 32 In the manufacture of the lamella 32, starting from a base lamella in which only the passages 34 are introduced and which is the same for all heat exchangers of a series of different power levels, cutouts of suitable shape, size and position are subsequently punched out to control the heat flow and / or to adapt the power .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (12)

1. Echangeur de chaleur avec des tubes garnis d'une multiplicité de lamelles, et avec des évidements qui influencent le passage de la chaleur et sont pratiqués dans les lamelles , échangeur de chaleur caractérisé en ce que les évidements (40, 41) sont pratiqués dans les lamelles (32), dans la zone des températures élevées, sensiblement entre des bords (36) des lamelles (32) situés du côté amont des gaz d'échappement pendant le fonctionnement, et des bords (38) des lamelles (32), situés du côté amont des gaz d'échappement, des passages (34) recevant les tubes (12), pour produire une répartition uniforme de la température et une différence maximale de température aussi faible que possible sur chaque lamelle (32).
2. Echangeur de chaleur selon la revendication 1, caractérisé en ce que les évidements (40, 41) sont prévus de façon prépondérante dans la zone (36), située du côté amont, des lamelles (32).
3. Echangeur de chaleur selon la revendication 1 ou 2, caractérisé en ce que les évidements (40, 41) sont répartis en forme de demi-cercle autour des tubes d'eau chaude (12).
4. Echangeur de chaleur selon l'une des revendications 1 à 3, caractérisé en ce que plusieurs évidements (40, 41) sont répartis autour de chaque tube d'eau chaude (12).
5. Echangeur de chaleur selon la revendication 4, caractérisé en ce qu'entre les évidements (40, 41) sont formées des entretoises (42), au moins une entretoise (42) reliant directement le bord (36), situé du côté amont, de la lamelle (32), au bord tourné vers celle-ci, (38) d'un tube d'eau chaude (12).
6. Echangeur de chaleur selon la revendication 4 ou 5, caractérisé en ce que les évidements (40, 21) sont répartis régulièrement, et les rapports entre les largeurs des évidements (40, 41) et les entretoises (42) situées entre eux, sont constants.
7. Echangeur de chaleur selon l'une des revendications 1 à 6, caractérisé en ce que la forme des évidements (40, 41) est adaptée à la forme des tubes d'eau chaude (12), et les évidements (40, 41) sont mis à une distance constante du bord (38) des tubes d'eau chaude (12).
8. Echangeur de chaleur selon l'une des revendications 6 et 7, caractérisé en ce que les angles d'ouverture ai et a2, vus à partie d'un centre (46) d'un tube d'eau chaude (12), des entretoises (42) et des évidements (40, 41), sont l'un par rapport à l'autre dans un rapport constant.
9. Echangeur de chaleur selon la revendication 8, caractérisé en ce que le rapport des angles d'ouverture ai et a2 est compris entre 1:7 et 1:10.
10. Echangeur de chaleur selon la revendication 8 et 9, caractérisé en ce que le rapport entre la distance d'un évidement (40, 41) par rapport au bord (38) d'un tube d'eau chaude (12), et le rayon du tube d'eau chaude (12) est compris entre 1:1,5 et 1:2,5, et est de préférence de l'ordre de 1:2.
11. Echangeur de chaleur selon l'une des revendications précédentes, caractérisé en ce que des évidements (48) sont prévus pour ajuster, avec les lamelles (32) la puissance de l'échangeur de chaleur (10).
12. Procédé pour fabriquer une lamelle d'un échangeur de chaleur selon l'une des revendications précédentes, qui présente des évidements influençant le passage de la chaleur, essentiellement entre des bords (36) des lamelles (32) situés, pendant le fonctionnement, du côté amont des gaz d'échappement, et des bords (38) des lamelles (32), situés du côté amont des gaz d'échappement, des passages (34) recevant les tubes (12), procédé caractérisé en ce que dans une première étape, on fabrique une lamelle de base d'une seule pièce avec des passages (34) pour des tubes (12) et, dans une deuxième étape, on estampe les évidements (40, 41, 48) pour régler le flux de chaleur et pour adapter en puissance la lamelle (12) à l'échangeur de chaleur (10).
EP91119203A 1990-12-29 1991-11-12 Echangeur de chaleur et procédé de production d'une lamelle pour un échangeur de chaleur Expired - Lifetime EP0493665B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4042195A DE4042195A1 (de) 1990-12-29 1990-12-29 Waermeuebertrage und verfahren zur herstellung einer lamelle fuer einen waermeuebertrager
DE4042195 1990-12-29

Publications (4)

Publication Number Publication Date
EP0493665A2 EP0493665A2 (fr) 1992-07-08
EP0493665A3 EP0493665A3 (en) 1992-11-19
EP0493665B1 true EP0493665B1 (fr) 1995-09-13
EP0493665B2 EP0493665B2 (fr) 1998-04-15

Family

ID=6421663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119203A Expired - Lifetime EP0493665B2 (fr) 1990-12-29 1991-11-12 Echangeur de chaleur et procédé de production d'une lamelle pour un échangeur de chaleur

Country Status (4)

Country Link
EP (1) EP0493665B2 (fr)
DE (2) DE4042195A1 (fr)
ES (1) ES2077142T5 (fr)
PT (1) PT99947B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9310827U1 (de) * 1993-07-06 1993-09-23 Balcke-Dürr AG, 40882 Ratingen Waermetauscher aus mehreren parallel zueinander angeordneten austauscherrohren
DE10315966B4 (de) 2003-04-08 2007-04-05 Robert Bosch Gmbh Wärmeübertrager

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB696380A (en) * 1949-11-25 1953-08-26 Junkers & Co Improvements in heat exchange apparatus
DE2813747A1 (de) * 1978-03-30 1979-10-04 Thermal Waerme Kaelte Klima Waermetauscherlamelle und anwendungen derselben
US4738225A (en) * 1987-06-03 1988-04-19 Juang Jinn C Heat transfer apparatus for water heater
AT391022B (de) * 1987-11-03 1990-08-10 Vaillant Gmbh Waermetauscher

Also Published As

Publication number Publication date
ES2077142T5 (es) 1998-06-16
EP0493665A2 (fr) 1992-07-08
DE4042195A1 (de) 1992-07-02
EP0493665B2 (fr) 1998-04-15
EP0493665A3 (en) 1992-11-19
ES2077142T3 (es) 1995-11-16
PT99947A (pt) 1993-11-30
DE59106481D1 (de) 1995-10-19
PT99947B (pt) 1999-05-31

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