EP0797058A1 - Wärmetauscherplatte - Google Patents

Wärmetauscherplatte Download PDF

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Publication number
EP0797058A1
EP0797058A1 EP97104379A EP97104379A EP0797058A1 EP 0797058 A1 EP0797058 A1 EP 0797058A1 EP 97104379 A EP97104379 A EP 97104379A EP 97104379 A EP97104379 A EP 97104379A EP 0797058 A1 EP0797058 A1 EP 0797058A1
Authority
EP
European Patent Office
Prior art keywords
plate
heat
wall
fumes
protrusions
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Withdrawn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
EP97104379A
Other languages
English (en)
French (fr)
Inventor
Gianvittore Boghetto
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.)
Fim- Fonderia Industrie Meccaniche SpA
Original Assignee
Fim- Fonderia Industrie Meccaniche SpA
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 Fim- Fonderia Industrie Meccaniche SpA filed Critical Fim- Fonderia Industrie Meccaniche SpA
Publication of EP0797058A1 publication Critical patent/EP0797058A1/de
Withdrawn legal-status Critical Current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
    • F28F3/022—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being wires or pins
    • 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
    • F24H3/02—Air heaters with forced circulation
    • F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
    • F24H3/10—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by plates
    • F24H3/105—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by plates using fluid fuel
    • 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
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • 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
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/146—Connecting elements of a heat exchanger

Definitions

  • This invention concerns a heat exchanging plate as set forth in the main claim.
  • the heat exchanging plate according to the invention is used in applications where an intense exchange of heat is required, in a limited space, between two fluids.
  • a preferential but not limited application of the heat exchanging plate according to the invention is on the exchange walls of hot air generators.
  • the heat exchanging plate according to the invention is used preferentially in heat generators fed by flame, such as for example gas burners, gas oil burners, kerosene burners or similar, where it is a particular problem to inspect and clean the soot from the end part of the conduit for the discharge of the fumes.
  • flame such as for example gas burners, gas oil burners, kerosene burners or similar
  • a very common case in practice is the transmission of heat between two areas through a wall, as for example happens in heat exchangers, where the maximum exchange of heat between two fluids is desired, in order to have high efficiency and reduced consumption.
  • the walls of the exchangers have an increased surface, generally by means of ribs or fins, this being all the more important as the difference in temperature between the two fluids is reduced.
  • Another disadvantage is that it is difficult to inspect and/or clean inside the heat exchangers known to the state of the art.
  • the purpose of the invention is to obtain a heat exchanging plate which can achieve a high rate of heat exchange in a limited space and therefore reduce the bulk of the exchanger while at the same time removing a high quantity of heat.
  • a further purpose of the invention is to enable the inside of the heat exchanger to be inspected and cleaned easily.
  • a further purpose of the invention is to obtain the greatest efficiency possible of the heat exchange, regardless of the direction of the two fluids between which the heat is exchanged, and also regardless of the difference in temperature of the two fluids.
  • a further purpose is to obviate the necessity for tortuous routes for the fluids, as they may draw the fumes less efficiently towards the chimney.
  • the heat exchanging plate according to the invention can be applied in cases when it is necessary to exchange heat between two fluids, for example in correspondence with the fumes-air exchanging walls of hot air generators.
  • the plate is associated with, but can be detached from, the walls and cooperates with a hole of a mating shape made in the exchange walls themselves.
  • the heat exchanging plate according to the invention comprises a metal plate, advantageously of high heat conducting material, which has fins, pins, corrugations, grooves or other irregularities on its surface suitable to increase the surface for exchanging heat on at least one of its faces.
  • the contour of the metal plate is variable depending on the application.
  • At least the front face has, in a position adjacent to the perimeter edge, a flat band, without any fins, pins or other protrusions, which acts as a seating for a sealing packing.
  • the plate may be connected to the wall of the heat exchanger in any way, for example by means of clamps, joints, etc.
  • the plate must be fixed in such a way that the protrusions on one face, for example the fins, protrude into one fluid and the protrusions on the other face, for example the pins, protrude into the other fluid.
  • the heat exchanging plate is attached with the connection elements and by interposing the sealing packing between the heat exchanging plate and the surface to which the plate is to be attached in such a way as to guarantee the hermetic separation of the two fluids.
  • the heat exchanging plate according to the invention is particularly advantageous in applications in correspondence with the end part of the route followed by the fumes, both because at that point the difference in temperature between the adjacent fluids is less and therefore a greater heat exchange is needed, and also because it is the area where soot and dirt most accumulate.
  • the plate can be removed, it is possible to carry out easy and rapid operations of inspection and cleaning.
  • FIGS 1 to 4 show a first type of the heat exchanging plate 10 according to the invention.
  • the heat exchanging plate 10 is composed of a metal plate 11 with variable thickness, shape and dimensions according to the applications, advantageously of high heat conducting quality, defined by a rear surface 12 and a front surface 13.
  • the metal plate 11 has, along its perimeter band, attachment holes 14 which serve to anchor the heat exchanging plate 10 onto a wall of the heat exchanger to which the plate 10 is associated.
  • protrusions in this case shaped like fins 15, which cross longitudinally and parallelly the rear surface 12 in such a way as to stimulate the flow of the fluid which laps them.
  • the fins 15 are substantially at right angles to the metal plate 11 and have a greater surface area at the base than at the top.
  • protrusions On the forward surface 13, facing towards the inside of the heat generator, there are protrusions, arranged at right angles, in this case pins in the shape of truncated cones 16, the shape of which does not prevent the regular flow of the fluid which laps them.
  • the protrusions shaped like truncated cone pins 16 are arranged to cover most of the forward surface 13 except for the perimeter area composed of a band without protrusions which acts as a seating for the sealing packing 17.
  • Figure 5 shows the longitudinal section of the plate 10 according to the invention attached to a wall 18, for example the wall of a heat exchanger in a hot air generator.
  • the wall 18 has a containing hole 19 of a shape mating with the perimeter contour of the metal plate 11 in such a way that the fins 15 on the rear surface 12 protrude into one fluid and the truncated cone pins 16 of the forward surface 13 protrude into the other fluid.
  • the heat exchanging plate 10 is attached by interposing the sealing packing 17 between the metal plate 11 and the wall 18 in such a way as to guarantee the hermetic separation of the two fluids.
  • Figure 6 shows a variant of Figure 5 where the metal plate 11 has a channel 20, which follows the perimeter contour of the plate and constitutes the containing seating for the sealing packing 17.
  • Figure 7 shows an application of the invention in a fumes-air heat exchanger.
  • a further advantage is given by the fact that the heat exchanging plate 10 can be easily removed from the wall 18 by acting on the connection elements associated with the attachment holes 14.
  • This operation allows the inside areas defined by the wall 18 and the forward surface 13 to be inspected and cleaned, which would not otherwise be possible.
  • Figure 8 shows an application of the invention in the final part of a heat exchanger for a hot air generator 21.
  • Figure 9 shows a variant of Figure 8.
  • the heat exchanging plate 10 is arranged at the front of a wall 22 lapped by fumes 25 on both sides.
  • the fumes directed towards the outlet 23 yield their heat to the heat exchanging plate 10 but, at the same time, they receive heat from the wall 22 which is lapped by hot fumes on the other side.
  • the wall 22 is covered on its inner surface near the outlet 23 with a suitable layer of refractory and insulating material 24.
  • the layer of refractory and insulating material 24 can be made for example of ceramic wool or other suitable material.
  • this layer 24 is attached and held on the wall 22 by means of suitable attaching and holding elements 27, for example metal sheet or mesh.

Landscapes

  • 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)
EP97104379A 1996-03-22 1997-03-14 Wärmetauscherplatte Withdrawn EP0797058A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96UD000037A IT1288867B1 (it) 1996-03-22 1996-03-22 Piastra scambiatrice di calore
ITUD960037 1996-03-22

Publications (1)

Publication Number Publication Date
EP0797058A1 true EP0797058A1 (de) 1997-09-24

Family

ID=11422054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97104379A Withdrawn EP0797058A1 (de) 1996-03-22 1997-03-14 Wärmetauscherplatte

Country Status (2)

Country Link
EP (1) EP0797058A1 (de)
IT (1) IT1288867B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE550812A (de) *
GB529037A (en) * 1939-04-11 1940-11-13 Edwin Watkinson Improvements in or relating to plate heat exchangers suitable for heating air
US3385356A (en) * 1965-07-20 1968-05-28 Dalin David Heat exchanger with improved extended surface

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE550812A (de) *
GB529037A (en) * 1939-04-11 1940-11-13 Edwin Watkinson Improvements in or relating to plate heat exchangers suitable for heating air
US3385356A (en) * 1965-07-20 1968-05-28 Dalin David Heat exchanger with improved extended surface

Also Published As

Publication number Publication date
ITUD960037A0 (de) 1996-03-22
ITUD960037A1 (it) 1997-09-22
IT1288867B1 (it) 1998-09-25

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