EP1061318A1 - Tube d'échange thermique pourvu de nervures et son procédé de fabrication, échangeur de chaleur pourvu d'un tel tube - Google Patents
Tube d'échange thermique pourvu de nervures et son procédé de fabrication, échangeur de chaleur pourvu d'un tel tube Download PDFInfo
- Publication number
- EP1061318A1 EP1061318A1 EP00420129A EP00420129A EP1061318A1 EP 1061318 A1 EP1061318 A1 EP 1061318A1 EP 00420129 A EP00420129 A EP 00420129A EP 00420129 A EP00420129 A EP 00420129A EP 1061318 A1 EP1061318 A1 EP 1061318A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ribs
- tube
- profile
- heat exchange
- offset
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 16
- 238000002788 crimping Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 3
- 240000007817 Olea europaea Species 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 239000010949 copper Substances 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 13
- 238000009835 boiling Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 239000013529 heat transfer fluid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 2
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 description 2
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 2
- 241000207836 Olea <angiosperm> Species 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
Images
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
- F28F1/10—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
Definitions
- the invention relates to a heat exchange tube, and to its manufacturing process, as well as a heat exchanger incorporating such a tube.
- the coefficient of heat exchange in two-phase phase between a smooth metal tube, such as a copper tube, and a heat transfer fluid, such as di-fluoro-chloromethane varies between 1500 and 3000 W / m 2 / ° C as a function of the heat flux transferred, that is to say as a function of the nature of the fluid in which the tube is immersed, which may be a liquid or a gas.
- this coefficient can be increased to values between approximately 3,800 W / m 2 / ° C and approximately 6,000 W / m 2 / ° C depending on the case, which constitutes a significant increase. .
- the invention aims to increase the value of the coefficient heat exchange of a tube, for its internal part without as much inconveniently increase the coefficient of friction fluid on the inner surface of the tube or plate, so to limit the pressure losses induced.
- the invention relates to an exchange tube thermal provided on its internal surface with ribs capable of be shaped, characterized in that these ribs have, before their shaping, an asymmetrical profile, the top of the profile of these ribs being offset relative to the base of this profile.
- the spaces defined between two adjacent ribs of the tube or plate appear, on one side, like a re-entrant cavity, that is to say with a partition inclined inwards, which increases substantially the heat exchange coefficient.
- the shaping of the ribs which can be obtained during the crimping of external fins of the tube, is facilitated by the fact that the top of their profile is, before this setting shape, offset from its base because the effort to exert is an effort to bend or accentuate their inclination, this effort being significantly less than a crushing effort pure which should be exercised if the top was located at the level from the base of the profile.
- the invention makes it possible to adapt, during the shaping of ribs, the geometry of the inner surface of the tube, so its heat exchange coefficient, to the nature of the fluid (s) with which it will be used.
- the fact that the top of the profile is offset from its base before this shaping allows to effectively control the final geometry obtained in modulating the effort exerted, for example using olives preselected dimensions, when crimping fins external to the tube.
- cavity means a cavity whose edges are closed at their opening relative to their background. Such a cavity tends to "trap” the fluid it contains, which promotes the creation of bubbles steam and increased heat exchange.
- the top offset is modifiable by overwriting ribs.
- the invention can be defined as for a heat exchange tube provided with ribs internal able to be shaped, characterized in that these ribs have, before shaping the ribs, a profile such that all the spaces defined between the ribs have an opening towards the center of the tube angularly offset from at the bottom of these spaces.
- the spaces between ribs are as many re-entrant cavities, on at least one side, which promotes all the heat exchanges and allows to reach the above-mentioned heat exchange coefficient values.
- the width of the opening between the ribs is less than that from their bottom. This increases the "reentry cavity” effect got.
- the invention also relates to a heat exchanger comprising a tube as previously described whose performance is significantly better than that of art prior.
- the invention finally relates to a method of manufacturing a tube of the aforementioned type and, more specifically, a method which consists in shaping the ribs by moving, by a radial pressure, the apex of the profile of each rib, which is offset from its base, towards a surface internal of the tube. This process creates, between the ribs, spaces with one side approaching geometry of a reentry cavity, while the intensity of the effort exercised can be precisely controlled.
- this crushing is carried out during the crimping of fins on the outer face of the tube.
- the combination of the two operations gives the function additional sought without significant increase in the price of comes back from the tube.
- the tube 1 shown in Figure 1 has a generally cylindrical profile, centered on an axis XX '.
- 1 a the internal surface of the tube and 1 b its external surface.
- the tube 1 On its inner surface 1 a, the tube 1 is provided with two ribs whose profile P, that is to say the section perpendicular to the axis XX 'is substantially triangular, the side faces P 1 and P 2 being straight before crimping.
- S the vertex of the profile P, this vertex being the trace an internal edge of the ribs 2 which may be straight or helical depending on the geometry chosen for the ribs.
- R the radius connecting the axis XX 'to the lateral edge L of the base B of each rib 2 closest to the vertex S.
- the vertex S of each rib is offset from the base B of the profile P, that is to say is located opposite the base B of this profile with respect to the radius Corresponding R.
- E the space defined between two contiguous ribs.
- the shape of the rib 2 which adjoins it is such that the space E resembles a re-entrant cavity in which the thermal contact between the fluid which circulates in the tube and the wall 1 internal 1 a of the tube is optimized, in particular during boiling in the case of use with a two-phase fluid.
- d 1 the width of the bottom F of each space E.
- d 2 the width of the opening O of each space E towards the axis XX '.
- the opening O of each space E is angularly offset around the axis XX 'relative to the bottom F because of the inclination and the crushing of the ribs 2.
- the width d 2 is less than the width d 1 , which accentuates the fact that the spaces E appear as the re-entrant cavities for the fluid which they contain when using the tube 1 .
- the invention is applicable to all types of tubes, they are formed "flat", that is to say shaped, rolled then welded, or internally grooved in a conventional manner.
- a tube produced by the invention may or may not include external cooling fins and can be used with a two-phase or single-phase fluid.
- a tube is used, the height of the ribs of which remains less than 0.5 mm whereas their number is important because the surface tension of the di -fluoro-methane is weaker than that of water.
- the heat exchange coefficient obtained can be of the order of 10,000 W / m 2 / ° C. In this case, the profile P is curved, as shown in Figures 4 to 6.
- a heat exchanger comprising tubes such as previously described is more effective than those of art because its overall heat exchange coefficient is superior.
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)
Abstract
Description
- hconv est le coefficient d'échange thermique par convection ;
- h nb est le coefficient d'échange thermique par ébullition et
- n est un nombre compris entre 1 et 3.
- Pour un flux faible, notamment inférieur à 10 kW/m2,
- h conv = ± 2 500 W/m2/°C
- h nb = ± 10 000 W/m2/°C.
- Pour un flux important, notamment supérieur à 20 kW/m2,
- h conv = 6 000 W/m2/°C
- h nb : 14 000 W/m2/°C
- les faces latérales du profil avant mise en forme sont sensiblement rectilignes ;
- les faces latérales du profil avant mise en forme sont globalement courbes, les rayons de courbure de deux faces d'une nervure étant différents ;
- les faces latérales du profil avant mise en forme sont globalement courbes, les centres de courbure de deux faces d'une nervure étant décalés.
- la figure 1 est une coupe transversale partielle d'un tube d'échange thermique conforme à l'invention, lors d'un premier stade de fabrication avant mise en forme finale de ses nervures internes ;
- la figure 2 est une coupe analogue à la figure 1 lors d'un second stade de fabrication après mise en forme des nervures ;
- la figure 3 est une coupe longitudinale du tube des figures 1 et 2 lors de l'étape de fabrication de la figure 2, on y a indiqué en I-I et II-II respectivement les plans de coupe des figures 1 et 2 ;
- la figure 4 est une vue analogue à la figure 1, pour un tube conforme à un second mode de réalisation de l'invention ;
- la figure 5 est une vue à plus grande échelle d'un profil de nervure visible à la figure 4 et
- la figure 6 est une vue analogue à la figure 2 pour le tube du second mode de réalisation représenté à la figure 4.
Claims (10)
- Tube (1) d'échange thermique pourvu, sur sa surface interne (1a), de nervures aptes à être mises en forme, caractérisé en ce que toutes lesdites nervures (2) ont, avant mise en forme, un profil (P) asymétrique, le sommet (S) dudit profil desdites nervures étant en déport par rapport à la base (B) dudit profil.
- Tube selon la revendication 1, caractérisé en ce que les faces latérales (P1, P2) dudit profil (P) avant mise en forme sont sensiblement rectilignes.
- Tube selon la revendication 1, caractérisé en ce que les faces latérales (P1, P2) dudit profil (P) avant mise en forme sont globalement courbes, les rayons de courbure (R1, R2) des deux faces (2) d'une nervure étant différents.
- Tube selon la revendication 1, caractérisé en ce que les faces latérales (P1, P2) dudit profil (P) avant mise en forme sont globalement courbes, les centres de courbure (C1, C2) de deux faces d'une nervure (2) étant décalés.
- Tube selon l'une des revendications 1 à 4, caractérisé en ce que le déport dudit sommet (S) est modifiable par écrasement desdites nervures (2).
- Tube (1) d'échange thermique pourvu de nervures internes aptes à être mises en forme, caractérisé en ce que lesdites nervures (2) ont, avant mise en forme des nervures, un profil (P) tel que tous les espaces (E) définis entre lesdites nervures ont une ouverture (O) vers le centre (XX') du tube décalée angulairement par rapport au fond (F) desdits espaces.
- Tube selon la revendication 6, caractérisé en ce que la largeur (d 2) de ladite ouverture (O) est inférieure à la largeur (d 1) dudit fond (F) desdits espaces (E).
- Echangeur de chaleur, caractérisé en ce qu'il comprend au moins un tube (1) selon l'une des revendications précédentes.
- Procédé de fabrication d'un tube (1) d'échange thermique pourvu de nervures aptes à être mises en forme, caractérisé en ce qu'il consiste à mettre en forme lesdites nervures (2) en déplaçant, au moyen d'une pression radiale, le sommet (S) du profil (P) de chaque nervure, qui est en déport par rapport à sa base (B), en direction d'une surface interne (1a) dudit tube.
- Procédé selon la revendication 9, caractérisé en ce que ledit écrasement est réalisé lors du sertissage d'ailettes (4) sur la face externe (1b) dudit tube (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9907865 | 1999-06-16 | ||
| FR9907865A FR2795168B1 (fr) | 1999-06-16 | 1999-06-16 | Element d'echange thermique pourvu de nervures et son procede de fabrication, echangeur de chaleur pourvu d'un tel element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1061318A1 true EP1061318A1 (fr) | 2000-12-20 |
| EP1061318B1 EP1061318B1 (fr) | 2003-09-10 |
Family
ID=9547080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00420129A Expired - Lifetime EP1061318B1 (fr) | 1999-06-16 | 2000-06-15 | Tube d'échange thermique pourvu de nervures et son procédé de fabrication, échangeur de chaleur pourvu d'un tel tube |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1061318B1 (fr) |
| AT (1) | ATE249610T1 (fr) |
| DE (1) | DE60005089T2 (fr) |
| ES (1) | ES2202024T3 (fr) |
| FR (1) | FR2795168B1 (fr) |
| PT (1) | PT1061318E (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1598626A1 (fr) * | 2004-05-19 | 2005-11-23 | Outokumpu Oyj | Refroidisseur d'air de suralimentation haute pression et haute température |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008030423B4 (de) | 2007-12-05 | 2016-03-03 | GIB - Gesellschaft für Innovation im Bauwesen mbH | Rohr mit einer durch Noppen Oberflächenprofil-modifizierten Außenmantelfläche |
| DE102009007446B4 (de) | 2009-02-04 | 2012-03-29 | Wieland-Werke Ag | Wärmeübertragerrohr und Verfahren zu dessen Herstellung |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2193188A1 (fr) * | 1972-07-14 | 1974-02-15 | Universal Oil Prod Co | |
| JPH0297896A (ja) * | 1988-09-30 | 1990-04-10 | Matsushita Refrig Co Ltd | 熱交換器の製造方法 |
| FR2706197A1 (fr) * | 1993-06-07 | 1994-12-16 | Trefimetaux | Tubes rainurés pour échangeurs thermiques d'appareils de conditionnement d'air et de réfrigération, et échangeurs correspondants. |
| US5415225A (en) * | 1993-12-15 | 1995-05-16 | Olin Corporation | Heat exchange tube with embossed enhancement |
| WO1996012151A1 (fr) * | 1994-10-18 | 1996-04-25 | The University Of Manchester Institute Of Science And Technology | Tube de transfert thermique |
-
1999
- 1999-06-16 FR FR9907865A patent/FR2795168B1/fr not_active Expired - Fee Related
-
2000
- 2000-06-15 ES ES00420129T patent/ES2202024T3/es not_active Expired - Lifetime
- 2000-06-15 PT PT00420129T patent/PT1061318E/pt unknown
- 2000-06-15 AT AT00420129T patent/ATE249610T1/de not_active IP Right Cessation
- 2000-06-15 DE DE60005089T patent/DE60005089T2/de not_active Expired - Fee Related
- 2000-06-15 EP EP00420129A patent/EP1061318B1/fr not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2193188A1 (fr) * | 1972-07-14 | 1974-02-15 | Universal Oil Prod Co | |
| JPH0297896A (ja) * | 1988-09-30 | 1990-04-10 | Matsushita Refrig Co Ltd | 熱交換器の製造方法 |
| FR2706197A1 (fr) * | 1993-06-07 | 1994-12-16 | Trefimetaux | Tubes rainurés pour échangeurs thermiques d'appareils de conditionnement d'air et de réfrigération, et échangeurs correspondants. |
| US5415225A (en) * | 1993-12-15 | 1995-05-16 | Olin Corporation | Heat exchange tube with embossed enhancement |
| WO1996012151A1 (fr) * | 1994-10-18 | 1996-04-25 | The University Of Manchester Institute Of Science And Technology | Tube de transfert thermique |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 014, no. 305 (M - 0992) 29 June 1990 (1990-06-29) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1598626A1 (fr) * | 2004-05-19 | 2005-11-23 | Outokumpu Oyj | Refroidisseur d'air de suralimentation haute pression et haute température |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60005089D1 (de) | 2003-10-16 |
| ES2202024T3 (es) | 2004-04-01 |
| FR2795168B1 (fr) | 2001-08-03 |
| ATE249610T1 (de) | 2003-09-15 |
| FR2795168A1 (fr) | 2000-12-22 |
| DE60005089T2 (de) | 2004-07-08 |
| EP1061318B1 (fr) | 2003-09-10 |
| PT1061318E (pt) | 2004-02-27 |
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Inventor name: JURKOWSKI, ROMUALD Inventor name: MICHAUD, JEAN-MARIE Inventor name: ALTAZIN, MARC Inventor name: NAVARRO, JEAN-MICHEL Inventor name: MEZIANI, SLIMANE Inventor name: BAILLY, ANDRE |
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