EP1178278A2 - Wärmeübertragungsrohr mit gedrallten Innenrippen - Google Patents
Wärmeübertragungsrohr mit gedrallten Innenrippen Download PDFInfo
- Publication number
- EP1178278A2 EP1178278A2 EP01117802A EP01117802A EP1178278A2 EP 1178278 A2 EP1178278 A2 EP 1178278A2 EP 01117802 A EP01117802 A EP 01117802A EP 01117802 A EP01117802 A EP 01117802A EP 1178278 A2 EP1178278 A2 EP 1178278A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ribs
- cross
- pipe
- tube
- inner ribs
- 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
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
- 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 fins rotationally symmetrical to the longitudinal axis of symmetry of the tube run.
- a known pipe of this type according to DE-GM 74 22 107 has several multi-start screw-like on its inside Inner ribs that have a small width b and a small radial Extend e.
- a heat exchanger is known from EP 0 582 835 A1 become known, which consists of several, in their outer wall tiered, non-generic tubes composed in their Interior with other differently configured pipes different dimensions and inner ribs concentric are arranged to serve as an oil cooler.
- This Heat pipes are next to their elaborate manufacture suffers from the disadvantage of considerable pressure loss because also - if it exists at all - one that Cross flow increasing heat transfer either not or can only arise accidentally and on the inner tube remains limited.
- the invention is based on the object Heat transfer tube of the type mentioned at the beginning create, which is compared to the previously known internally finned tubes by a much better Heat transfer performance distinguishes itself and for this purpose not just an increase in the internal heat transfer area served, but also an effective cross flow between the Inner wall surface of the tube and the core flow near the Longitudinal axis of symmetry to increase heat transfer guaranteed.
- the Cross-sectional shape of each rib is a pointed, isosceles Triangle with straight leg sides, the Triangle tip rounded by a radius in the two Leg sides merges, with two adjacent inner ribs form a space trapezoidal in cross section.
- This Cross-sectional shape is in principle from DE 33 34 964 A1 known, but there the ribs run without any twist, so that it in conjunction with the swirl features of claim 1 are not known as known.
- each inner fin of the tube is the shape of a Tooth in the case of gears with convexly curved flanks with a rounded tooth tip, with two adjacent ribs a cross-sectionally U-shaped space with concave grasp sunken side surfaces.
- This rib shape is particularly suitable for high viscosity fluids such as oils.
- each inner rib an isosceles, pointed triangle with concave legs and a semicircular shape at the top, with two adjacent ones Inner ribs a space trapezoidal in cross section Grip in a U-shape, the trapezoidal legs convex to the outside are arched.
- This rib shape is preferably used in the Flow of fluids of low viscosity, like them have gases, for example.
- the wall thickness of the tube is dependent on System pressure is determined and is advantageously in a range between 0.4mm and 3mm, with each tube having at least four inner fins having.
- the distance a is the free ends of the inner ribs from the axis of symmetry of the Tube with large viscosity fluids, such as with oils, larger and Low viscosity fluids such as water and gases are lower sized. This increases the cross section of the Core flow in the area of the free cross section near the Longitudinal axis of symmetry for fluids with high viscosity Low viscosity fluids.
- the free interior near the The longitudinal axis of symmetry is never closed in any tube become. This space must be with the channels between the ribs communicate. For this reason, point in an advantageous Training the free ends of the inner ribs from the Longitudinal axis of symmetry, even with low viscosity fluids such a distance a from this that between its free Obtain a core flow channel ends in each cross section of the tube remains. For this reason, according to feature a) of Main claim this distance a is not less than 1/12 of Pipe inner diameter are dimensioned.
- Fig. 1 is a first embodiment of the tube 1 according to the invention shown.
- the forms Cross-sectional shape of each rib 2 is a pointed, isosceles Triangle with straight leg sides 2a, 2b, the Triangle tip 2c rounded into the two by means of a radius r Leg sides 2a, 2b merges.
- Two adjacent ones Inner ribs 2 form a trapezoidal cross section Gap 2d.
- each inner rib 3 of the tube 1 the shape of a tooth in gearwheels with convex externally curved side flanks 3a, 3b with a rounded Tooth tip 3c.
- Two adjacent ribs 3 encompass one in cross section U-shaped space 3d with convex sunken side faces that are identical to the shape of the Side flanks 3a, 3b of the ribs 3 are.
- FIG. 3 A further cross-sectional shape is disclosed in FIG. 3. there forms the cross section of each inner rib 4 isosceles, pointed triangle with concave inside incident leg sides 4a, 4b with a semicircular Tip 4c. Grip two adjacent inner ribs 4 at a time U-shaped, a space 4d trapezoidal in cross section, whose trapezoidal legs are convexly curved outwards and are identical to the leg sides 4a, 4b.
- Each tube 1 is with at least four inner ribs 2, 3, 4, in present case with eight inner ribs 2, 3, 4 each.
- the free ends 2c, 3c, 4c are with the tips of the cross-sectional shapes of the individual inner ribs 2, 3, 4 identical. However, it must note that the tips are on the flat Cross-sectional body of a triangle, however, the free ends themselves on a twisted to the longitudinal axis 5 of symmetry refer to the spatial body.
- These free ends 2c, 3c, 4c have to the longitudinal axis of symmetry 5 of the tube 1 at a distance a in Relation to the inner pipe diameter d in a range of 1:12 to 1: 3.
- the tubes are advantageously either extruded Made of aluminum or copper or extruded in plastic.
- the wall thickness d 1 of the pipe 1 depends on the system pressure and is in a range between 0.4 mm and 3 mm.
- the tubes 1 also from other than that in the pipes 1 to 3 shown may consist of that instead of the eight ribs 2, 3, 4 shown there, for example, only four Ribs 2, 3, 4 or more than eight ribs in the interior of tube 1 are arranged.
- the number of ribs 2, 3, 4, the length L of the Twist as well as the thickness and rib shape are dependent on the type of fluid and its flow rate as well designed by the pressure drop.
- the general flow rule applies that the narrower the free pressure, the greater the pressure drop Flow cross section in the core area and between the Single ribs 2, 3, 4 is that on the other hand with larger Number of ribs and the associated larger Heat transfer area also the heat transfer performance passively increases.
- the swirl and the transverse flow thereby induced between the core area in the vicinity of the longitudinal axis 5 of symmetry and the tube inner wall 9 are of fundamental importance. This is illustrated in Fig. 5.
- a core flow 7 is formed, which due to the swirling of the end regions, which coincide with the ends of the tips 2c, 3c, 4c agree, a swirl is given, which is a left-hand swirl in the case shown, ie is connected to a rotation in the plane of the drawing in the counterclockwise direction, as indicated by arrow 6 in FIGS. 4 and 5.
- Such a tube 1 is used, for example a tube bundle heat exchanger 12, as shown in Fig. 6.
- the cooling medium enters through the connector 13 the tubes 1 and leaves them through the outlet 14.
- the medium to be cooled for example, flows through the countercurrent Inlet connector 15 on the outside 11 of the tubes 1 and leaves the heat exchanger 12 in the cooled down state by the Outlet port 16.
- the inventive Tube 1 for both cooling and heating fluids Can be used depending on the direction in which the Heat transfer process should take place.
Landscapes
- 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)
Abstract
Description
209,3 W/(mK) Aluminium und
407,1 W/(mK) bei Kupfer erfolgt eine erhebliche Wärmeübertragungsleistung von der Kernströmung 7 über die Querströmung 8 an die Innenseite 9 des Rohres 1 und von dort weiter durch dessen Wand 10 mit der Dicke d1 auf die Außenseite 11 statt.
- Rohr
- 1
- Innenrippen
- 2, 3, 4
- Schenkelseiten der Innenrippe 2
- 2a, 2b
- Dreieckspitze
- 2c
- trapezförmiger Zwischenraum
- 2d
- Seitenflanken der Innenrippe 3
- 3a, 3b
- Zahnspitze
- 3c
- U-förmiger Zwischenraum
- 3d
- Schenkelseiten der Innenrippe 4
- 4a, 4b
- halbkreisförmige Spitze
- 4c
- Zwischenraum
- 4d
- Pfeil
- 6
- Kernströmkanal
- 7
- Querströmung
- 8
- Innenseite des Rohres 1
- 9
- Wand des Rohres 1
- 10
- Außenseite des Rohres 1
- 11
- Rohrbündelwärmeübertrager
- 12
- Eintritt in die Rohre 1
- 13
- Austritt
- 14
- Eintrittstutzen
- 15
- Auslaßstutzen
- 16
- Abstand der freien Enden 2c, 3c, 4c zur Symmetrielängsachse 5
- a
- Rohrinnendurchmesser
- d
- Wanddicke der Rohre 1
- d1
- Drallänge
- L
- Wärmeleitfähigkeit
- λ
- Radius
- r
Claims (11)
- Rohr mit mehreren gedrallten Innenrippen, die zur Symmetrielängsachse des Rohres rotationssymmetrisch verlaufen, gekennzeichnet durch folgende Merkmale:a) Die freien Enden (2c, 3c, 4c) der Innenrippen (2, 3, 4) weisen zur Symmetrielängsachse (5) des Rohres (1) einen Abstand (a) auf, der im Verhältnis zum Rohrinnendurchmesser (d) in einem Bereich von 1:12 bis 1:3 liegt,b) sämtliche Innenrippen (2, 3, 4) verlaufen zur Symmetrielängsachse (5) drallartig in gleicher Richtung (Pfeil 6) und mit gleicher Drallänge (L).
- Rohr nach Anspruch 1, dadurch gekennzeichnet, daß die Querschnittsform einer jeden Innenrippe (2) ein spitzes, gleichschenkeliges Dreieck mit gerade verlaufenden Schenkelseiten (2a, 2b) bildet, dessen Dreieckspitze (2c) mittels eines Radius (r) abgerundet in die beiden Schenkelseiten (2a, 2b) übergeht, wobei jeweils zwei benachbarte Innenrippen (2) einen im Querschnitt trapezförmigen Zwischenraum (2d) bilden.
- Rohr nach Anspruch 1, dadurch gekennzeichnet, daß die Querschnittsform einer jeden Innenrippe (3) des Rohres (1) die Form eines Zahnes bei Zahnrädern mit konvex nach außen gewölbten Seitenflanken (3a, 3b) mit abgerundeter Zahnspitze (3c) aufweist und zwei benachbarte Rippen (3) einen im Querschnitt U-förmigen Zwischenraum (3d) mit konkav eingefallenen Seitenflächen umgreifen.
- Rohr nach Anspruch 1, dadurch gekennzeichnet, daß die Querschnittsform einer jeden Innenrippe (4) ein gleichschenkeliges, spitzes Dreieck mit konkav nach innen einfallenden Schenkelseiten (4a, 4b) und eine Halbkreisform an der Spitze (4c) aufweist, wobei jeweils zwei benachbarte Innenrippen (4) einen im Querschnitt trapezförmigen Zwischenraum (4d) U-förmig umgreifen, dessen Trapezschenkel konvex nach außen gewölbt sind.
- Rohr nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Rohr (1) mit seinen Innenrippen (2, 3, 4) einteilig aus stranggepreßtem Aluminium oder Kupfer, bzw. aus extrudiertem Kunststoff besteht.
- Rohr nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Querschnittskonfiguration des Rohres (1) mit seinen Innenrippen (2, 3, 4) und den Zwischenräumen (2d, 3d, 4d) über die Länge (L) der Verdrallung in jeder Querschnittsebene gleich ist.
- Rohr nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Wanddicke (d1) des Rohres (1) in Abhängigkeit vom Systemdruck in einem Bereich zwischen 0,4 mm und 3 mm liegt.
- Rohr nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß es (1) mindestens vier Innenrippen (2, 3, 4) aufweist.
- Rohr nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Anzahl der Rippen (2, 3, 4), die Länge (L) der Verdrallung, die Dicke und Form der Rippen (2, 3, 4) in Abhängigkeit von der Art des Fluids und dessen Strömungsgeschwindigkeit sowie vom Druckabfall gestaltet ist.
- Rohr nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Abstand (a) der freien Enden (2c, 3c, 4c) der Innenrippen (2, 3, 4) von der Symmetrielängsachse (5) des Rohres (1) bei Fluiden großer Viskosität, wie bei Ölen, größer als bei Fluiden geringer Viskosität, wie Wasser und Gasen, bemessen ist.
- Rohr nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die freien Enden (2c, 3c, 4c) der Innenrippen (2, 3, 4) von der Symmetrielängsachse (5) auch bei Fluiden geringer Viskosität stets einen solchen Abstand (a) von dieser aufweisen, daß zwischen dessen freien Enden (2c, 3c, 4c) in jeder Querschnittsebene des Rohres (1) ein Kernströmkanal (7) gebildet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10038624 | 2000-08-03 | ||
DE10038624A DE10038624C2 (de) | 2000-08-03 | 2000-08-03 | Wärmeübertragungsrohr mit gedrallten Innenrippen |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1178278A2 true EP1178278A2 (de) | 2002-02-06 |
EP1178278A3 EP1178278A3 (de) | 2004-01-07 |
EP1178278B1 EP1178278B1 (de) | 2005-11-30 |
Family
ID=7651692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01117802A Expired - Lifetime EP1178278B1 (de) | 2000-08-03 | 2001-07-21 | Wärmeübertragungsrohr mit gedrallten Innenrippen |
Country Status (5)
Country | Link |
---|---|
US (1) | US6533030B2 (de) |
EP (1) | EP1178278B1 (de) |
AT (1) | ATE311581T1 (de) |
DE (2) | DE10038624C2 (de) |
DK (1) | DK1178278T3 (de) |
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DE9203670U1 (de) * | 1991-03-15 | 1992-05-21 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | Lamellenwärmetauscher |
MX9305803A (es) * | 1992-10-02 | 1994-06-30 | Carrier Corp | Tubo de transferencia de calor con nervaduras internas. |
JP3001181B2 (ja) * | 1994-07-11 | 2000-01-24 | 株式会社クボタ | エチレン製造用反応管 |
GB9420946D0 (en) * | 1994-10-18 | 1994-12-07 | Univ Manchester | Heat transfer tube |
US5655599A (en) * | 1995-06-21 | 1997-08-12 | Gas Research Institute | Radiant tubes having internal fins |
DE19609641C2 (de) * | 1996-03-12 | 1999-05-06 | Kiefer Gmbh Maschf G G | Verfahren und System zum Kühlen eines Raumes |
JP3811909B2 (ja) * | 1997-03-21 | 2006-08-23 | 三菱電機株式会社 | 伝熱管およびそれを用いた熱交換器 |
-
2000
- 2000-08-03 DE DE10038624A patent/DE10038624C2/de not_active Expired - Fee Related
-
2001
- 2001-07-21 EP EP01117802A patent/EP1178278B1/de not_active Expired - Lifetime
- 2001-07-21 AT AT01117802T patent/ATE311581T1/de not_active IP Right Cessation
- 2001-07-21 DE DE50108221T patent/DE50108221D1/de not_active Expired - Fee Related
- 2001-07-21 DK DK01117802T patent/DK1178278T3/da active
- 2001-07-23 US US09/911,248 patent/US6533030B2/en not_active Expired - Fee Related
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DE2402942A1 (de) | 1973-01-23 | 1974-07-25 | Wikstroem Ab Berth | Elektrisches heizgeraet |
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DE3334964A1 (de) | 1983-09-27 | 1985-04-18 | Wolf Klimatechnik GmbH, 8302 Mainburg | Innenrippenrohr fuer gas- oder oelbeheizte heizkessel |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111256211A (zh) * | 2020-01-20 | 2020-06-09 | 海信(山东)空调有限公司 | 空调器 |
CN112948970A (zh) * | 2021-03-01 | 2021-06-11 | 西北工业大学 | 一种基于球凸肋片的螺旋蒸发管结构设计方法 |
Also Published As
Publication number | Publication date |
---|---|
DK1178278T3 (da) | 2006-04-03 |
EP1178278B1 (de) | 2005-11-30 |
US6533030B2 (en) | 2003-03-18 |
DE50108221D1 (de) | 2006-01-05 |
DE10038624C2 (de) | 2002-11-21 |
DE10038624A1 (de) | 2002-02-21 |
ATE311581T1 (de) | 2005-12-15 |
EP1178278A3 (de) | 2004-01-07 |
US20020014328A1 (en) | 2002-02-07 |
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