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WO1999058919A1 - Tuyau en aluminium adapte a la fabrication d'echangeurs thermiques et echangeurs thermiques fabriques avec ce type de tuyau - Google Patents

Tuyau en aluminium adapte a la fabrication d'echangeurs thermiques et echangeurs thermiques fabriques avec ce type de tuyau Download PDF

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Publication number
WO1999058919A1
WO1999058919A1 PCT/EP1999/003281 EP9903281W WO9958919A1 WO 1999058919 A1 WO1999058919 A1 WO 1999058919A1 EP 9903281 W EP9903281 W EP 9903281W WO 9958919 A1 WO9958919 A1 WO 9958919A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
duct
pipes
ducts
spiral
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.)
Ceased
Application number
PCT/EP1999/003281
Other languages
English (en)
Inventor
Ennio Zulian
Gianni Zulian
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU42607/99A priority Critical patent/AU4260799A/en
Publication of WO1999058919A1 publication Critical patent/WO1999058919A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
    • 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
    • F28F1/26—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 being integral with the element
    • 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
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • F28F1/405—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element and being formed of wires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded

Definitions

  • the invention refers to a pipe especially suitable for use in heat exchangers and to the heat exchangers produced with this pipe. It is well known that heat exchangers are tubular devices with pipes generally set parallel to one another and generally belonging to a closed circuit within which a fluid is made to flow that yields heat to the environment, or absorbs heat from the environment. This exchange may occur directly between the exchange coil and the atmosphere or by means of another fluid, for instance water, if the heat exchange coil is immersed in the water.
  • One recurrent configuration of the coil used to exchange heat consists of a single pipe bent in a U shape various times with several straight lengths parallel to one another so that two sections of the coil are running side by side where the fluid running through one pipe flows in one direction and the fluid in the other pipe at its side flows in the opposite direction.
  • This type of construction means that the two sections parallel to one another are connected by a U junction.
  • One of the scopes of this invention is to produce a pipe, suitable for use in producing heat exchangers, that significantly increases the heat exchange over currently known pipes.
  • this pipe the intention is to make heat exchangers that, with equal heat exchange, are much lighter, cheaper, more compact or that, with equal volume and weight, can give markedly higher performance.
  • Another scope set for the invention is to make a pipe that creates high turbulence in the fluid running through it, although without significantly increasing the pressure drop.
  • Yet another scope of the invention is to select a material, for the production of the pipe invention, that can support well chemical attacks from metals dissolved in the heat exchanging fluid that runs through the heat exchanger coil, with special reference to acid substances.
  • the intention is to avoid the need of applying surface heat treatments such as Pb-Sn alloys that, in known technology, is normally carried out on copper pipes in order to increase their resistance to corrosive agents found in the flame or environment.
  • a pipe in aluminium suitable for making heat exchangers having a basically quadrilateral external form and internally containing one or more ducts suitable for the passage of a heat exchanging fluid, said pipe being provided with outside fins belonging to two opposite outside surfaces and obtained from said surfaces by raising the material, where, in accordance with the contents of the first claim said pipe is characterised in that each of the ducts belonging to said pipe has at least a wire of basically circular section spirally wound along the whole pipe length so that a turbulence is created in the fluid flowing through said pipe.
  • the heat exchanger made with the pipe invention includes a series of said pipes and is characterised in that it has two headers opposite to one another, between which the pipes are inserted and set basically parallel to one another with their ends connected to said headers so that the liquid in all sections of pipe flows in the same direction. This proves to be an evident advantage since the single flow through the header is divided in several pipes and the overall flow of exchange fluid can therefore be easily increased in the heat exchanger coil to markedly higher levels than current known technology thanks to its higher heat exchange capacity.
  • An advantage according to the invention is the use of aluminium, and in particular the aluminium pipe having fins formed out of the pipe itself, is that it allows surface treatments to be avoided as would otherwise occur, as mentioned above, with copper pipes that are subjected to the direct action of the flame and environment, and for this reason have to be lined with lead and tin alloys. Because of the use of aluminium in the pipe invention there is an increase in the pipe's resistance to thermal shocks, since there is no surface film and so there is no possibility that this should peel or melt. What's more, since aluminium has a lower specific weight than copper the whole exchanger unit is lighter with an equal thermal power.
  • - fig. 1 shows a partial prospective view of the pipe invention together with the spiralled wire inserted within it
  • - fig. 2 is a cross section of fig. I along line ll-ll;
  • - fig. 3 shows a variant of the pipe according to the invention with several ducts; - fig. 4 shows another variant of the pipe according to the invention
  • - fig. 5 shows a blown up view of a heat exchanger before its assembly using the pipes of the invention
  • - fig. 6 is a section of fig. 5.
  • an aluminium pipe like the one represented in fig. 1 , indicated by 1 has been made according to known technology and in other words by extrusion of the aluminium pipe and subsequent construction of the fins by spurring or raising the material by means of suitable tools on two opposite, parallel sides 2 and 3.
  • the pipe 1 thereby obtains a double set of fins, one being on the one side indicated by 2, and one on the opposite side indicated by 3 as shown in fig.'s I and 2.
  • the pipe section in fig. 1 is basically quadrangular and inside this pipe a wire 4 is inserted, wound in a spiral with a spiral diameter basically uniform to the inside measurement of the duct.
  • Fig. 3 shows a prospective view of a variant of the pipe invention indicated by 6 which shows four ducts 61 , 62, 63 and 64 which contain the spiral 4.
  • the pipe invention here indicated in general by 7, has four ducts 71 , 72, 73 and 74 of circular section inside which an additional pipe has been inserted, respectively indicated by 75, 76, 77 and 78 made of material suitable to resist the corrosion of chemical agents in the fluid that passes through the pipe itself.
  • Pipes 75, 76, 77 and 78 may, for example, be made of stainless steel, in order to be more effective in resisting against scaling or attack from free metal ions.
  • FIG. 5 shows an example of how the pipe invention has been used to make a heat exchanger suitable for gas boilers.
  • the exchanger indicated in general by 10
  • the exchanger is composed of four sections of pipe 9, where each pipe 9 has four ducts 93, 94, 95 and 96 with straight lengths and fins 91 and 92 on both sides of each pipe.
  • a wire spiral is inserted inside the ducts of each pipe.
  • the spiral may even be continuous and run through all the pipes 93, 94, 95 and 96 bent to and fro within the pipes themselves, which does not create any difference in function.
  • the ends of the pipes 9 are slotted into plates 11 each having openings 110 where said ends are welded. Once the pipes 9 are bonded to the plates 11 , they are then welded or fixed by means of ducts and suitable gaskets and screws to headers 12 and 13 respectively. As seen in fig. 6, the flow of fluid that enters the header 12 is divided into four branches of the pipes 9 to then be funnelled back together in the header 13 and exit after having undergone the heat exchange. It is precisely this increased heat exchange capacity of each of the pipes making up the exchanger that allows said exchanger to be produced with headers and with parallel pipes. Even though said pipes are short, the low thermal inertia ensures the most effective transmission of heat without being obliged to extend - 6 -
  • the construction of the heat exchanger as illustrated in fig.'s 5 and 6 also emphasises the simplicity of the exchanger's design, which is limited to just two headers and equal sections of pipes according to the invention set between the two headers.
  • the simplicity of the header's construction as described above is further increased by the relative ease with which current techniques can weld aluminium to aluminium such as, for instance, on the heads of the pipes 9 to the plates 11.
  • One known technique is TIG welding, however this does not exclude other possible forms of welding or union even using special adhesives.
  • aluminium being a material that is particularly resistant to chemical attack from substances contained in the gas burner's flame, avoids a need, which until now has been inevitable, to carry out outside surface treatments such as applying PB-SN lead-tin alloys on copper pipes to prevent this attack from the flame on the actual copper.
  • a cladding can be given by pipes made of a basically corrosion-proof material like stainless steel.
  • the pipe invention and especially the exchanger made from the pipe invention, can be used to advantage in flash boilers currently constructed exclusively by pipes in stainless steel or metal cast, precisely because of the high aggressivity of the gas emissions that this type of boiler produces.
  • Another interesting application for the heat exchangers, in addition to the heating sector, could be the refrigeration sector, both for cooling and for their heat exchange, for instance in exchangers for cooling transformer oil that is cooled by a coil through which the fluid requiring cooling passes, in other words the oil, and that is cooled by a flow of outside air channelled by special fans.
  • the pipe invention also with more than one wire spirally wound along the whole lenght of the pipe, may naturally be used for exchangers applied in any most widespread of technological sectors always with surprising advantage, given the efficacy of heat exchange that, as said, with equal exchange capacity cuts dimensions by about 30% in plane and about 50% in volume, while the exchanger's weight is reduced by about half.

Landscapes

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

Abstract

L'invention se rapporte à un tuyau en aluminium (1, 6, 7) adapté à la fabrication d'échangeurs thermiques. Ce tuyau possède une forme externe sensiblement quadrilatérale et il comporte intérieurement un ou plusieurs conduits permettant le passage d'un fluide échangeur de chaleur. Ledit tuyau comporte des ailettes externes (2, 3 ; 91, 92) sur deux de ses surfaces externes opposées à partir desquelles lesdites ailettes sont formées par soulèvement de matière. Chacun des conduits situés dans ledit tuyau possède au moins un fil métallique (4) de section sensiblement ronde, enroulé en spirale sur toute la longueur dudit tuyau, de sorte qu'une turbulence est crée dans le fluide qui passe dans un tel tuyau.
PCT/EP1999/003281 1998-05-13 1999-05-12 Tuyau en aluminium adapte a la fabrication d'echangeurs thermiques et echangeurs thermiques fabriques avec ce type de tuyau Ceased WO1999058919A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42607/99A AU4260799A (en) 1998-05-13 1999-05-12 Aluminium pipe suitable for the production of heat exchangers and heat exchangers made with this pipe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT98VI000100A ITVI980100A1 (it) 1998-05-13 1998-05-13 Tubo in alluminio adatto a realizzare scambiatori di calore e scambia tori di calore realizzati con tale tubo
ITVI98A000100 1998-05-13

Publications (1)

Publication Number Publication Date
WO1999058919A1 true WO1999058919A1 (fr) 1999-11-18

Family

ID=11426721

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/003281 Ceased WO1999058919A1 (fr) 1998-05-13 1999-05-12 Tuyau en aluminium adapte a la fabrication d'echangeurs thermiques et echangeurs thermiques fabriques avec ce type de tuyau

Country Status (3)

Country Link
AU (1) AU4260799A (fr)
IT (1) ITVI980100A1 (fr)
WO (1) WO1999058919A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005068927A1 (fr) * 2004-01-07 2005-07-28 Dow Global Technologies Inc. Procede pour fabriquer un tube de transfert thermique

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886639A (en) * 1975-02-01 1975-06-03 Peerless Of America Method of making a finned heat exchanger
EP0023757A1 (fr) * 1979-06-21 1981-02-11 Christopher Evan Mundell Tibbs Echangeur de chaleur pour ventilation
US4798241A (en) * 1983-04-04 1989-01-17 Modine Manufacturing Mixed helix turbulator for heat exchangers
EP0299408A1 (fr) * 1987-07-14 1989-01-18 Hitachi Cable, Ltd. Tuyau revêtu d'une couche en résine sur sa surface interne et méthode de fabrication d'une tel tuyau
EP0307609A1 (fr) * 1987-09-17 1989-03-22 Kalenborn Kalprotect - Dr. Mauritz GmbH & Co. KG Tuyau ayant un revêtement interne pour la protection contre les attaques chimiques en hautes pressions
WO1992017729A1 (fr) * 1991-04-02 1992-10-15 Okan Akin Procede de fabrication d'un tuyau metallique pourvu au moins sur sa face interieure d'une couche de protection
EP0661511A1 (fr) * 1993-12-31 1995-07-05 Hoechst Aktiengesellschaft Tuyau d'échange thermique avec élément incorporé
US5538079A (en) * 1994-02-16 1996-07-23 Pawlick; Daniel R. Heat exchanger with oblong grommetted tubes and locating plates

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886639A (en) * 1975-02-01 1975-06-03 Peerless Of America Method of making a finned heat exchanger
EP0023757A1 (fr) * 1979-06-21 1981-02-11 Christopher Evan Mundell Tibbs Echangeur de chaleur pour ventilation
US4798241A (en) * 1983-04-04 1989-01-17 Modine Manufacturing Mixed helix turbulator for heat exchangers
EP0299408A1 (fr) * 1987-07-14 1989-01-18 Hitachi Cable, Ltd. Tuyau revêtu d'une couche en résine sur sa surface interne et méthode de fabrication d'une tel tuyau
EP0307609A1 (fr) * 1987-09-17 1989-03-22 Kalenborn Kalprotect - Dr. Mauritz GmbH & Co. KG Tuyau ayant un revêtement interne pour la protection contre les attaques chimiques en hautes pressions
WO1992017729A1 (fr) * 1991-04-02 1992-10-15 Okan Akin Procede de fabrication d'un tuyau metallique pourvu au moins sur sa face interieure d'une couche de protection
EP0661511A1 (fr) * 1993-12-31 1995-07-05 Hoechst Aktiengesellschaft Tuyau d'échange thermique avec élément incorporé
US5538079A (en) * 1994-02-16 1996-07-23 Pawlick; Daniel R. Heat exchanger with oblong grommetted tubes and locating plates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005068927A1 (fr) * 2004-01-07 2005-07-28 Dow Global Technologies Inc. Procede pour fabriquer un tube de transfert thermique

Also Published As

Publication number Publication date
AU4260799A (en) 1999-11-29
ITVI980100A1 (it) 1999-11-13

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