EP1178278B1 - Tube d'échange de chaleur avec ailettes intérieures tordues - Google Patents

Tube d'échange de chaleur avec ailettes intérieures tordues Download PDF

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Publication number
EP1178278B1
EP1178278B1 EP01117802A EP01117802A EP1178278B1 EP 1178278 B1 EP1178278 B1 EP 1178278B1 EP 01117802 A EP01117802 A EP 01117802A EP 01117802 A EP01117802 A EP 01117802A EP 1178278 B1 EP1178278 B1 EP 1178278B1
Authority
EP
European Patent Office
Prior art keywords
pipe
ribs
symmetry
longitudinal axis
cross
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
EP01117802A
Other languages
German (de)
English (en)
Other versions
EP1178278A3 (fr
EP1178278A2 (fr
Inventor
Jovan Prof. Dr.-Ing. Mitrovic
Steffen Dipl.-Kfm. Dittmann
Michael SCHÖNHERR
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.)
Fw Brokelmann Aluminiumwerk & Cokg GmbH
Original Assignee
Fw Brokelmann Aluminiumwerk & Cokg 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
Application filed by Fw Brokelmann Aluminiumwerk & Cokg GmbH filed Critical Fw Brokelmann Aluminiumwerk & Cokg GmbH
Publication of EP1178278A2 publication Critical patent/EP1178278A2/fr
Publication of EP1178278A3 publication Critical patent/EP1178278A3/fr
Application granted granted Critical
Publication of EP1178278B1 publication Critical patent/EP1178278B1/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
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/51—Heat exchange having heat exchange surface treatment, adjunct or enhancement
    • Y10S165/518—Conduit with discrete fin structure
    • Y10S165/524—Longitudinally extending

Definitions

  • the invention relates to a tube with twisted inner ribs, the to the symmetry longitudinal axis of the tube rotationally symmetrical run.
  • a known tube of this type according to DE-GM 74 22 107 has on its inside several multi-course helical Inner ribs on which a small width b and a small radial Have extension e.
  • EP 0 582 835 A1 discloses a heat exchanger become known, consisting of several, in their outer wall graded, non-generic pipes composed in whose Interior further differently configured tubes with different dimensions and internal ribs concentric are arranged, which are to serve as oil cooler.
  • These Heat transfer tubes are in addition to their complex production Afflicted with the disadvantage of a significant pressure loss, because also - as far as it is present - a the Heat transfer increasing crossflow either not or can only happen accidentally and on the inner tube remains limited.
  • Heat transfer tube of the type mentioned above create, which is compared to the previously known internally ribbed pipes by a significantly better Heat transfer performance excels and for this purpose not only an increase in the internal heat transfer surface operated, but also an effective cross flow between the Inner wall surface of the tube and the core flow near the SymmetrielShsachse for heat transfer increase guaranteed.
  • each rib forms the Cross-sectional shape of each rib a pointed, isosceles Triangle with straight leg sides, whose Triangle point by means of a radius rounded off in the two Leg sides merges, each with two adjacent inner ribs form a trapezoidal cross-section space.
  • cross-sectional shape is basically from DE 33 34 964 A1 known, but there run the ribs without any twist, so that in conjunction with the twisting features of claim 1 not to be known as known.
  • each inner fin of the tube the shape of a Tooth on gears with convex outward flanks with rounded tooth tip, with two adjacent ribs a cross-sectionally U-shaped intermediate space with concave encompass sunken side surfaces.
  • This rib shape is especially suitable for high viscosity fluids such as oils.
  • each inner rib an isosceles, pointed triangle with concave inward-falling thorns and a semicircular shape at the top, with two adjacent each Internal ribs a trapezoidal space in cross section Embrace U-shaped, whose trapezoidal leg convexly outwards are arched.
  • This rib shape is preferably used in the Flow through fluids of low viscosity, as they for example, have gases.
  • these tubes are mass-produced with their Internal ribs made of extruded aluminum or copper or out made of extruded plastic. It is characterized both Aluminum as well as copper due to a high thermal conductivity.
  • the wall thickness of the pipe is determined by the System pressure determined and is advantageous in a range between 0.4 mm and 3 mm, each tube having at least four internal ribs having.
  • the distance a is the free ends of the inner ribs of the symmetry axis of the Pipe in fluids of high viscosity, such as oils, larger and at Low viscosity fluids, such as water and gases, lower sized. This increases the cross section of the Core flow in the area of the free cross section near the Symmetry longitudinal axis against high viscosity fluids Low viscosity fluids.
  • Fig. 1 is a first embodiment of the inventive tube 1 shown. This forms the Cross-sectional shape of each rib 2 a pointed, isosceles Triangle with straight leg sides 2a, 2b, whose Triangle tip 2c rounded by a radius r in the two Leg sides 2a, 2b passes. Two adjacent each Inner ribs 2 form a trapezoidal in cross-section Gap 2d.
  • each inner rib 3 of the tube 1, the shape of a tooth in gears with convex outside curved side flanks 3a, 3b with a rounded Tooth tip 3c on.
  • Two adjacent ribs 3 surround one in cross-section U-shaped space 3d with convex sunken side surfaces that are identical to the shape of the Side edges 3a, 3b of the ribs 3 are.
  • each inner rib 4 forms a isosceles, pointed triangle with concave inward incident leg sides 4a, 4b with a semicircular Tip 4c.
  • each case surround two adjacent inner ribs 4 U-shaped a cross-section trapezoidal space 4d, whose trapezoidal legs are curved convexly outward and identical to the leg sides 4a, 4b.
  • Each tube 1 is provided with at least four inner ribs 2, 3, 4, in present case, each with eight inner ribs 2, 3, 4 provided.
  • the Free ends 2c, 3c, 4c are with the tips of the cross-sectional shapes the individual inner ribs 2, 3, 4 identical. It must, however be noted that the tips are on the flat Cross-sectional body of a triangle, whereas the free ends are on a twisted to the symmetry longitudinal axis 5 extending refer to spatial body.
  • These free ends 2c, 3c, 4c have to the symmetry longitudinal axis 5 of the tube 1 a distance a, in the Ratio to the pipe inside diameter d in a range of 1: 12 to 1: 3 is.
  • the tubes are advantageous either from an extruded Aluminum or copper produced or extruded in plastic.
  • the wall thickness d 1 of the tube 1 is dependent on the system pressure and is in a range between 0.4 mm and 3 mm.
  • tubes 1 also other than those in Figures 1 to 3 shown tubes may consist, that is for example, only four, instead of the eight ribs 2, 3, 4 shown there Ribs 2, 3, 4 or more than eight ribs in the interior of the tube. 1 are arranged. Because the number of ribs 2, 3, 4, the length L of Twisting as well as the thickness and rib shape are dependent on the type of fluid and its flow velocity as well designed by the pressure drop. The general flow rule applies, that the smaller the free pressure, the greater the pressure drop Flow cross section in the core area and between the Single ribs 2, 3, 4, but that on the other hand with larger Number of ribs and larger size associated with it Heat transfer surface and the heat transfer performance passive rises.
  • Such a tube 1 is used, for example a shell and tube heat exchanger 12, as shown in Fig. 6.
  • a tube 1 enters the cooling medium through the pipe 13 in the tubes 1 and exits through the outlet 14.
  • Im Countercurrent occurs, for example, to be cooled medium through the Inlet 15 to the outside 11 of the tubes 1 and leaves the heat exchanger 12 in the cooled state by the Outlet 16.
  • the inventive Tube 1 both for cooling and for heating fluids Can be used, depending on the direction of the Heat transfer process to take place.

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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)
  • Rigid Pipes And Flexible Pipes (AREA)

Claims (10)

  1. Tube (1) avec plusieurs ailettes intérieures tordues (2, 3, 4) qui s'étendent de façon symétrique en rotation à l'axe longitudinal de symétrie (5) du tube (1), les extrémités libres (2c, 3c, 4c) des ailettes intérieures (2, 3, 4) comportant par rapport à l'axe longitudinal de symétrie (5) du tube (1) une distance (a) qui en proportion du diamètre intérieur (d) du tube se situe dans un fourchette de 1 : 12 à 1 : 3 et toutes les ailettes intérieures (2, 3, 4) s'étendant de façon tordue par rapport à l'axe longitudinal de symétrie (5) dans la même direction (flèche 6), avec la même longueur de torsion (11), la forme de section transversale de chaque ailette intérieure (2) formant un triangle aigu à côtés égaux, avec des côtés latéraux (2a, 2b) s'étendant de façon rectiligne dont le sommet du triangle (2c) passe de façon arrondie avec un angle (r) dans les deux côtés latéraux (2a, 2b) et respectivement deux ailettes intérieures voisines (2) formant un espace intérieur (2d) de section transversale trapézoïdale.
  2. Tube (1) avec plusieurs ailettes intérieures tordues (2, 3, 4) qui s'étendent de façon symétrique en rotation par rapport à l'axe longitudinal de symétrie (5) du tube (1), les extrémités libres (2c, 3c, 4c) des ailettes intérieures (2, 3, 4) présentant par rapport à l'axe longitudinal de symétrie (5) du tube (1) une distance (a), qui en proportion du diamètre intérieur du tube (d) se situe dans une fourchette de 1 : 12 à 1 : 3 et l'ensemble des ailettes intérieures (2, 3, 4) s'étendant de façon tordue par rapport à l'axe longitudinal de symétrie (5), dans la même direction (flèche 6) avec une même longueur de torsion (11), la forme de la section transversale de chaque ailette intérieure (3) du tube (1) présentant la forme d'une dent pour des roues dentées à flancs latéraux courbés de façon convexe vers l'extérieur (3a, 3b) avec une pointe de dent arrondie (3c) et deux ailettes voisines (3) entourant un espace intermédiaire (3d) de section transversale en forme de U avec des surfaces latérales à dépression concave.
  3. Tube (1) avec plusieurs ailettes intérieures tordues (2, 3, 4) qui s'étendent de façon symétrique en rotation par rapport à l'axe longitudinal de symétrie (5) du tube (1), les extrémités libres (2c, 3c, 4c) des ailettes intérieures (2, 3, 4) présentant par rapport à l'axe longitudinal de symétrie (5) du tube (1) une distance (a), qui en proportion du diamètre intérieur du tube (d) se situe dans une fourchette de 1 : 12 à 1 : 3 et l'ensemble des ailettes intérieures (2, 3, 4) s'étendant de façon tordue par rapport à l'axe longitudinal de symétrie (5), dans la même direction (flèche 6) avec une même longueur de torsion (11), la forme de la section transversale de chaque ailette intérieure (4) comportant un triangle aigu à côtés égaux, avec des côtés latéraux (4a, 4b) à dépression concave vers l'intérieur et une forme de demi cercle sur le sommet (4c) et respectivement deux ailettes voisines (4) entourant en forme de U un espace intermédiaire de section transversale trapézoïdale (4d) dont les côtés du trapèze sont courbés de façon convexe vers l'extérieur.
  4. Tube selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le tube (1) avec ses ailettes intérieures (2, 3, 4) est composé en monobloc d'un aluminium ou d'un cuivre filé à chaud, respectivement d'une matière plastique extrudée.
  5. Tube selon l'une quelconque des revendications 1 à 4, caractérisé en ce que dans le plan de section transversale, la configuration de la section transversale du tube (1) avec ses ailettes intérieures (2, 3, 4) et les espaces intermédiaires (2d, 3d, 4d) est identique sur la longueur (L) de la torsion.
  6. Tube selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'épaisseur de paroi (dl) du tube (2) se situe dans une fourchette de 0,4 mm à 3 mm, en fonction de la pression du système.
  7. Tube selon l'une quelconque des revendications 1 à 6, caractérisé en ce (1) qu'il comporte au moins quatre nervures intérieures (2, 3, 4).
  8. Tube selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le nombre d'ailettes (2, 3, 4), la longueur (L) de la torsion, l'épaisseur et la forme des ailettes (2, 3, 4) sont conçus en fonction de la nature du fluide et de sa vitesse de circulation, ainsi que de la chute de pression.
  9. Tube selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la distance (a) entre les extrémités libres (2c, 3c, 4c) des ailettes intérieures (2, 3, 4) et l'axe longitudinal de symétrie (5) du tube (1) est dimensionnée à des valeurs plus importantes pour les fluides très visqueux comme des huiles que pour des fluides de faible viscosité, comme l'eau et les gaz.
  10. Tube selon l'une quelconque des revendications 1 à 9, caractérisé en ce que même pour des fluides de faible viscosité, les extrémités libres (2c, 3c, 4c) des ailettes intérieures (2, 3, 4) présentent par rapport à l'axe longitudinal de symétrie (5) une distance (a) telle qu'entre chacune des extrémités libres (2c, 3c, 4c) de ce dernier un canal de circulation à coeur (7) est formé dans chaque plan de section transversale du tube (1).
EP01117802A 2000-08-03 2001-07-21 Tube d'échange de chaleur avec ailettes intérieures tordues Expired - Lifetime EP1178278B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10038624A DE10038624C2 (de) 2000-08-03 2000-08-03 Wärmeübertragungsrohr mit gedrallten Innenrippen
DE10038624 2000-08-03

Publications (3)

Publication Number Publication Date
EP1178278A2 EP1178278A2 (fr) 2002-02-06
EP1178278A3 EP1178278A3 (fr) 2004-01-07
EP1178278B1 true EP1178278B1 (fr) 2005-11-30

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EP01117802A Expired - Lifetime EP1178278B1 (fr) 2000-08-03 2001-07-21 Tube d'échange de chaleur avec ailettes intérieures tordues

Country Status (5)

Country Link
US (1) US6533030B2 (fr)
EP (1) EP1178278B1 (fr)
AT (1) ATE311581T1 (fr)
DE (2) DE10038624C2 (fr)
DK (1) DK1178278T3 (fr)

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Publication number Publication date
DK1178278T3 (da) 2006-04-03
EP1178278A3 (fr) 2004-01-07
DE10038624A1 (de) 2002-02-21
DE50108221D1 (de) 2006-01-05
DE10038624C2 (de) 2002-11-21
US6533030B2 (en) 2003-03-18
EP1178278A2 (fr) 2002-02-06
ATE311581T1 (de) 2005-12-15
US20020014328A1 (en) 2002-02-07

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