EP0591094A1 - Internally ribbed heat transfer tube - Google Patents

Internally ribbed heat transfer tube Download PDF

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Publication number
EP0591094A1
EP0591094A1 EP93630072A EP93630072A EP0591094A1 EP 0591094 A1 EP0591094 A1 EP 0591094A1 EP 93630072 A EP93630072 A EP 93630072A EP 93630072 A EP93630072 A EP 93630072A EP 0591094 A1 EP0591094 A1 EP 0591094A1
Authority
EP
European Patent Office
Prior art keywords
tube
heat transfer
ribs
transfer tube
rib
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Withdrawn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
EP93630072A
Other languages
German (de)
English (en)
French (fr)
Inventor
Robert H.L. Chiang
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.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Publication of EP0591094A1 publication Critical patent/EP0591094A1/en
Withdrawn legal-status Critical Current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
    • 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

  • This invention relates generally to tubes used in heat exchangers for transferring heat between a fluid inside the tube and a fluid outside the tube. More particularly, the invention relates to a heat exchanger tube having ribs on its internal surface to improve the heat transfer performance of the tube. Such a tube is adaptable to use in heat exchangers of air conditioning, refrigeration and similar systems.
  • the tubing is frequently enhanced on its external surface by the use of plate fins.
  • the enhancement is usually a pattern of helical ribs placed on the internal surface.
  • Helical rib enhancements to internal tube surfaces increase the heat transfer performance of the tube in two ways. First, working the tube wall to form the ribs increases the heat transfer area of the tube. Second, the ribs promote turbulence in the fluid flowing inside the tube. The turbulence minimizes the thickness of the heat transfer inhibiting laminar boundary layer on the inner surface of the tube.
  • the object of the present invention is to achieve high heat transfer efficiency in an internally enhanced heat transfer tube while at the same time assuring adequate tube burst strength with a minimum of wall material and acceptable fluid flow characteristics through the tube.
  • the invention achieves this objective in a heat transfer tube having helical ribs on its internal surface.
  • the ranges of rib helix angles, rib height and rib density have been selected to optimize heat transfer efficiency as well as provide adequate strength and fluid flow.
  • the tube can be made out of any suitable material by any forming process but is particularly adaptable to being manufactured from a copper or copper alloy in a process in which the internal enhancement is first roll embossed on to one surface of a metal strip, then roll forming the strip into a tubular shape and then seam welding the roll formed strip into a tube. If the tube is manufactured using this method, then the helical groove will not be continuous around the entire inner circumference of the tube. There will be a region in the vicinity of the seam weld that does not contain the enhancement. The effect of this unenhanced region on tube performance is negligible.
  • FIG. 1 is a sectioned pictorial view of the heat transfer tube of the present invention.
  • FIG. 2 is a cross sectioned elevation view of the heat transfer tube of the present invention.
  • FIG. 3 is an illustrative cross sectioned view of a portion of the wall of the heat transfer tube of the present invention.
  • FIGS. 4 and 5 are cross sectioned views of portions of the walls of two embodiments of the heat transfer tube of the present invention.
  • FIG. 6 is an isometric view of a portion of an embossed strip used to manufacture the heat transfer tube of the present invention.
  • FIG. 7 is a cross sectioned view of a portion of the wall of the heat transfer tube of the present invention showing the unenhanced weld zone of the tube when it is manufactured from roll formed and seam welded strip.
  • FIG. 1 in a sectioned pictorial view, depicts a heat transfer tube in which the present invention is embodied.
  • heat transfer tube 10 has surface enhancement 11 extending over substantially all of its internal surface.
  • FIG. 2 depicts heat transfer tube 10 in a cross sectioned elevation view. Only a single rib 14 of axial surface enhancement 11 ( FIG. 1 ) is shown for clarity, but in the enhancement of the present invention, a plurality of ribs 14 , all parallel to each other, extend out from wall 13 of tube 14 . Rib 14 is inclined at angle ⁇ from tube longitudinal axis a T . Tube 10 has internal diameter, as measured from the internal surface of the tube between ribs, D i .
  • FIG. 3 is an illustrative cross sectioned view of a portion of wall 13 of heat transfer tube 10 of the present invention depicting details of the ribbed enhancements on the internal surface of the tube.
  • Extending inward (toward the center of tube 10 ) are a plurality of ribs 14 .
  • Each of ribs 14 has base width W R and height H R .
  • Fin apex angle ⁇ is the angle formed at the intersection of the planes of first and second sides 17 and 18 of ribs 14 when the planes are extended.
  • Formed between ribs 14 are a plurality of grooves 15 .
  • the ribs shown in FIG. 3 are trapezoidal in cross section. Because of the dimensions of the ribs, the working characteristics of the metal used in the tube and the manufacturing processes employed to form the ribs, it would be difficult, if not impossible, to produce sharp edged trapezoidal ridges.
  • metal does not completely fill the grooves of the embossing roller and the ribs that are formed have cross sections more like those depicted in FIGS. 4 and 5 .
  • the rib cross section may be either substantially triangular, as shown in FIG. 4 , or substantially rectangular, as shown in FIG. 5 .
  • a rib having an apex angle of less than 15° can rather arbitrarily be considered to have a rectangular cross section while an apex angle of more than 15° will produce a rib having a triangular cross section.
  • a tube embodying the present invention and having a nominal outside diameter of 20 mm (3/4 inch) or less should have an internal enhancement of ribs with the following parameters:
  • the ribs and grooves of the present invention may be formed on the interior surface of the heat transfer tube by any suitable process, such as drawing, mandrel insertion, machining or the like.
  • any suitable process such as drawing, mandrel insertion, machining or the like.
  • an effective method is to apply the enhancement pattern by roll embossing on one surface of a metal strip before the strip is roll formed into a circular cross section and seam welded into a tube.
  • FIG. 6 shows metal strip 20 having enhancement pattern 21 embossed into one of its surfaces. Along each edge of strip 20 is left an unenhanced region 22 that will become the weld zone in the finished tube.
  • FIG . 7 shows a cross sectioned view of a portion of wall 13 of tube 10 .
  • Weld zone 31 in this embodiment does not contain ribs. This region of different configuration will not adversely affect the thermal or fluid flow performance of the tube in any significant way.

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)
EP93630072A 1992-10-02 1993-09-30 Internally ribbed heat transfer tube Withdrawn EP0591094A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US95613992A 1992-10-02 1992-10-02
US956139 1992-10-02

Publications (1)

Publication Number Publication Date
EP0591094A1 true EP0591094A1 (en) 1994-04-06

Family

ID=25497804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93630072A Withdrawn EP0591094A1 (en) 1992-10-02 1993-09-30 Internally ribbed heat transfer tube

Country Status (6)

Country Link
EP (1) EP0591094A1 (ja)
JP (1) JPH06201286A (ja)
KR (1) KR940009564A (ja)
CN (1) CN1087162A (ja)
BR (1) BR9303895A (ja)
MX (1) MX9305803A (ja)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692694A2 (en) * 1994-07-11 1996-01-17 Carrier Corporation Heat transfer tube
EP0696718A1 (en) * 1994-08-08 1996-02-14 Carrier Corporation Heat transfer tube
WO1996012151A1 (en) * 1994-10-18 1996-04-25 The University Of Manchester Institute Of Science And Technology Heat transfer tube
EP0893509A1 (de) * 1997-07-23 1999-01-27 MANNESMANN Aktiengesellschaft Abhitzekessel
US5950718A (en) * 1994-07-11 1999-09-14 Kubota Corporation Heat exchange tubes
DE10038624A1 (de) * 2000-08-03 2002-02-21 Broekelmann Aluminium F W Wärmeübertragungsrohr mit gedrallten Innenrippen
EP1270123A1 (en) * 2001-06-28 2003-01-02 Camozzi Holding S.P.A. A tool provided with high-efficiency cooling ducts
WO2003076861A1 (fr) * 2002-03-12 2003-09-18 Trefimetaux Tubes rainures a utilisation reversible pour echangeurs thermiques
DE10210016A1 (de) * 2002-03-07 2003-09-25 Wieland Werke Ag Wärmeaustauschrohr mit berippter Innenoberfläche
EP1482269A2 (fr) * 2003-05-26 2004-12-01 Tréfimétaux S.A. Tubes rainurés pour échangeurs thermiques à fluide monophasique, typiquement aqueux
EP3483545A1 (en) * 2017-11-08 2019-05-15 Carrier Corporation Heat change tube for the end product of air conditioning system and manufacturing method thereof
EP3508557A1 (en) * 2018-01-09 2019-07-10 Paralloy Limited Pipes for chemical processing
US20210041143A1 (en) * 2018-03-13 2021-02-11 Franco Diederiks Electric water hearing apparatus
WO2022214811A1 (en) * 2021-04-07 2022-10-13 Paralloy Limited Axial reformer tube
GB2610892A (en) * 2021-04-07 2023-03-22 Paralloy Ltd Axial reformer tube

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2912826B2 (ja) * 1994-08-04 1999-06-28 住友軽金属工業株式会社 内面溝付伝熱管
CN1211633C (zh) * 2003-05-10 2005-07-20 清华大学 不连续双斜内肋强化换热管
CN103673603A (zh) * 2012-09-26 2014-03-26 中国石油大学(北京) 有交错排布衬里的加热炉辐射炉管
CN103486343A (zh) * 2013-10-09 2014-01-01 苏州市吴中区曙光铜管厂 一种刚性好的铜管
JP6878918B2 (ja) * 2017-01-30 2021-06-02 株式会社富士通ゼネラル 冷凍サイクル装置
CN109519909B (zh) * 2018-12-18 2023-11-28 佛山市顺德区美的洗涤电器制造有限公司 蒸汽发生器及家用电器
CN110763068A (zh) * 2019-11-30 2020-02-07 广东美的制冷设备有限公司 换热器和空调器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2552679A1 (de) * 1974-11-25 1976-06-16 Hitachi Ltd Waermeuebertragungsrohr
DE2828094A1 (de) * 1977-06-29 1979-01-18 Carrier Corp Hochleistungswaermeaustauscher
EP0148609A2 (en) * 1983-12-28 1985-07-17 Hitachi Cable, Ltd. Heat-transfer tubes with grooved inner surface

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62142995A (ja) * 1985-12-17 1987-06-26 Hitachi Cable Ltd 内面らせん溝付伝熱管
GB2212899B (en) * 1987-11-30 1991-11-20 American Standard Inc Heat exchanger tube having minute internal fins
JP2721253B2 (ja) * 1989-11-30 1998-03-04 古河電気工業株式会社 伝熱管の製造方法
JPH04260793A (ja) * 1991-02-13 1992-09-16 Furukawa Electric Co Ltd:The 内面溝付伝熱管

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2552679A1 (de) * 1974-11-25 1976-06-16 Hitachi Ltd Waermeuebertragungsrohr
DE2828094A1 (de) * 1977-06-29 1979-01-18 Carrier Corp Hochleistungswaermeaustauscher
EP0148609A2 (en) * 1983-12-28 1985-07-17 Hitachi Cable, Ltd. Heat-transfer tubes with grooved inner surface

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692694A2 (en) * 1994-07-11 1996-01-17 Carrier Corporation Heat transfer tube
EP0692694A3 (ja) * 1994-07-11 1996-02-14 Carrier Corp
US5950718A (en) * 1994-07-11 1999-09-14 Kubota Corporation Heat exchange tubes
EP0696718A1 (en) * 1994-08-08 1996-02-14 Carrier Corporation Heat transfer tube
WO1996012151A1 (en) * 1994-10-18 1996-04-25 The University Of Manchester Institute Of Science And Technology Heat transfer tube
EP0893509A1 (de) * 1997-07-23 1999-01-27 MANNESMANN Aktiengesellschaft Abhitzekessel
DE10038624A1 (de) * 2000-08-03 2002-02-21 Broekelmann Aluminium F W Wärmeübertragungsrohr mit gedrallten Innenrippen
DE10038624C2 (de) * 2000-08-03 2002-11-21 Broekelmann Aluminium F W Wärmeübertragungsrohr mit gedrallten Innenrippen
US6533030B2 (en) 2000-08-03 2003-03-18 F.W. Brokelmann Aluminiumwerk Gmbh & Co. Kg Heat transfer pipe with spiral internal ribs
EP1270123A1 (en) * 2001-06-28 2003-01-02 Camozzi Holding S.P.A. A tool provided with high-efficiency cooling ducts
DE10210016A1 (de) * 2002-03-07 2003-09-25 Wieland Werke Ag Wärmeaustauschrohr mit berippter Innenoberfläche
DE10210016B4 (de) * 2002-03-07 2004-01-08 Wieland-Werke Ag Wärmeaustauschrohr mit berippter Innenoberfläche
DE10210016B9 (de) * 2002-03-07 2004-09-09 Wieland-Werke Ag Wärmeaustauschrohr mit berippter Innenoberfläche
FR2837270A1 (fr) * 2002-03-12 2003-09-19 Trefimetaux Tubes rainures a utilisation reversible pour echangeurs thermiques
WO2003076861A1 (fr) * 2002-03-12 2003-09-18 Trefimetaux Tubes rainures a utilisation reversible pour echangeurs thermiques
US7048043B2 (en) 2002-03-12 2006-05-23 Trefimetaux Reversible grooved tubes for heat exchangers
EP1482269A3 (fr) * 2003-05-26 2005-11-09 Tréfimétaux S.A. Tubes rainurés pour échangeurs thermiques à fluide monophasique, typiquement aqueux
FR2855601A1 (fr) * 2003-05-26 2004-12-03 Trefimetaux Tubes rainures pour echangeurs thermiques a fluide monophasique, typiquement aqueux
EP1482269A2 (fr) * 2003-05-26 2004-12-01 Tréfimétaux S.A. Tubes rainurés pour échangeurs thermiques à fluide monophasique, typiquement aqueux
EP3483545A1 (en) * 2017-11-08 2019-05-15 Carrier Corporation Heat change tube for the end product of air conditioning system and manufacturing method thereof
EP3508557A1 (en) * 2018-01-09 2019-07-10 Paralloy Limited Pipes for chemical processing
US20210041143A1 (en) * 2018-03-13 2021-02-11 Franco Diederiks Electric water hearing apparatus
WO2022214811A1 (en) * 2021-04-07 2022-10-13 Paralloy Limited Axial reformer tube
GB2610892A (en) * 2021-04-07 2023-03-22 Paralloy Ltd Axial reformer tube
GB2610892B (en) * 2021-04-07 2023-11-15 Paralloy Ltd Axial reformer tube

Also Published As

Publication number Publication date
JPH06201286A (ja) 1994-07-19
CN1087162A (zh) 1994-05-25
MX9305803A (es) 1994-06-30
BR9303895A (pt) 1994-04-19
KR940009564A (ko) 1994-05-20

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