EP1482269B1 - Tubes rainurés pour échangeurs thermiques à fluide monophasique, typiquement aqueux - Google Patents

Tubes rainurés pour échangeurs thermiques à fluide monophasique, typiquement aqueux Download PDF

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Publication number
EP1482269B1
EP1482269B1 EP04007195A EP04007195A EP1482269B1 EP 1482269 B1 EP1482269 B1 EP 1482269B1 EP 04007195 A EP04007195 A EP 04007195A EP 04007195 A EP04007195 A EP 04007195A EP 1482269 B1 EP1482269 B1 EP 1482269B1
Authority
EP
European Patent Office
Prior art keywords
ribs
typically
tubes
tubes according
equal
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
EP04007195A
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German (de)
English (en)
French (fr)
Other versions
EP1482269A3 (fr
EP1482269A2 (fr
Inventor
Nicolas Avanan
Guy De Hollain
Pascal Leterrible
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.)
Trefimetaux SAS
Original Assignee
Trefimetaux SAS
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 Trefimetaux SAS filed Critical Trefimetaux SAS
Priority to PL04007195T priority Critical patent/PL1482269T3/pl
Publication of EP1482269A2 publication Critical patent/EP1482269A2/fr
Publication of EP1482269A3 publication Critical patent/EP1482269A3/fr
Application granted granted Critical
Publication of EP1482269B1 publication Critical patent/EP1482269B1/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
    • 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
    • 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
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y10T29/49382—Helically finned

Definitions

  • the invention relates to the field of tubes for heat exchangers, and more particularly the field of heat exchanger tubes using a so-called "monophasic" fluid, that is to say a fluid for which the heat exchange does not include a cycle of evaporation and condensation, the so-called “two-phase” fluids being those that involve the latent heats of vaporization and condensation.
  • a so-called "monophasic" fluid that is to say a fluid for which the heat exchange does not include a cycle of evaporation and condensation
  • the so-called "two-phase” fluids being those that involve the latent heats of vaporization and condensation.
  • Japanese Application No. 57-58088 discloses V-grooved tubes, with H included between 0.02 mm and 0.2 mm, and with an angle ⁇ between 4 ° and 15 °. Neighboring tubes are described in Japanese Application No. 57-58094.
  • Japanese Application No. 52-38663 discloses tubes with V or U grooves, with H between 0.02 and 0.2 mm, a pitch P between 0.1 and 0.5 mm and an angle ⁇ between 4 and 15 °.
  • U.S. Patent No. 4,044,797 discloses V or U groove tubes adjacent to the preceding tubes.
  • Japanese Utility Model No. 55-180186 discloses trapezoidal grooves and triangular ribs, with a height H of 0.15 to 0.25 mm, a pitch P of 0.56 mm, an apex angle ⁇ (angle called ⁇ in this document) typically equal to 73 °, an angle ⁇ of 30 °, and an average thickness of 0.44 mm.
  • U.S. Patent Nos. 4,545,428 and 4,480,684 disclose V-grooved tubes and triangular ribs, with the height H of 0.1 to 0.6 mm, a pitch P of 0.2 to 0.6 mm, an apex angle ⁇ of between 50 and 100 °, a helix angle ⁇ of between 16 and 35 °.
  • Japanese Patent No. 62-25959 describes tubes with trapezoidal grooves and ribs, with a groove depth H of between 0.2 and 0.5 mm, a pitch P of between 0.3 and 1.5 mm, the width average of the grooves being at least equal to the average width of the ribs.
  • the pitch P is 0.70 mm and the helix angle ⁇ is 10 °.
  • the European patent EP-B 1-701 680 in the name of the applicant, describes grooved tubes, with grooves with a flat bottom and with ribs of different height H, of helix angle ⁇ between 5 and 50 °, apex angle ⁇ between 30 and 60 °, so as to obtain better performance after crimping the tubes and mounting in the exchangers.
  • the present invention relates to tubes or exchangers in the field of single-phase fluids and for reversible applications, ie tubes or exchangers that can be used with water or brine as coolant or heat transfer fluids, c. that is, typically to cool air in the air conditioner exchangers, or typically to heat air in said exchangers.
  • the Applicant has therefore researched and developed tubes and exchangers that are both economical, with a relatively low weight per meter, high heat exchange performance, and low pressure drop, for applications or fields that use monophasic fluids.
  • said helix angle ⁇ may preferably range from 25 ° to 35 °. Indeed, it is the field which makes it possible to obtain a high heat exchange coefficient Hi and which makes it possible to be manufactured by grooving a tube, the heat exchange coefficient Hi decreasing substantially for the lower values of the ⁇ helix angle and manufacturing speed decreasing for higher ⁇ helix values.
  • said apex angle ⁇ may be typically less than 45 ° and may be preferably between 15 and 30 °. Indeed, for higher values of the apex angle ⁇ , the exchange coefficient Hi tends to decrease, and for lower values, there are manufacturing difficulties, in particular because of the wear of tools or shaping mandrels, and in addition the acute angles tend to be destroyed during the formation of a battery with fin, during the expansion of the tubes.
  • the H / De ratio may be 0.028 ⁇ 0.3.
  • the P / H ratio can range from 3.5 to 7, but the best results are obtained when this ratio is preferably from 4 to 6 (see test A for example). , and in particular for relatively high values of H at least equal to 0.30 mm.
  • said ribs may be of triangular, trapezoidal or quadrilateral section, with possibly rounded corners at the top.
  • said ribs may have a "trapezoid" type profile with a base and an apex, said vertex comprising a substantially flat central portion, and possibly sloping with respect to said base, as illustrated in FIG. 2c. .
  • the top of said rib forming a short side of the trapezium may have rounded edges, as is often the case when the profile of the ribs forms a triangle.
  • said rounded top and / or said rounded edges may have radii of curvature less than 100 microns
  • the connection of the ribs audits typically flat bottoms having radii of curvature less than 100 microns, preferably from 20 to 50 microns.
  • Said rounded vertex or said rounded edges may have a radius of curvature preferably less than 80 microns, said radius of curvature typically ranging from 40 microns to 80 microns.
  • said ribs may be symmetrical and connect to said typically flat bottoms with right and left connection angles ⁇ 1 and ⁇ 2 such that ⁇ 1 - ⁇ 2 is typically equal to 0 or at most equal to 10 °, so as to form symmetrical or quasi-symmetrical ribs.
  • said ribs can be connected to said typically flat bottoms with right and left connection angles ⁇ 1 and ⁇ 2 such that ⁇ 1 - ⁇ 2 is at least equal to 10 °, so to form asymmetrical or inclined ribs.
  • said ribs may form an alternating succession of ribs having right and left connection angles ⁇ 1 and ⁇ 2 for one and ⁇ 2 and ⁇ 1 for the other.
  • said ribs may have a base of triangular shape over a height h B and a vertex of trapezoidal shape over a height h S , with H being equal to h B + hs, and h B / hs typically ranging from 1 to 2.
  • said succession can be an alternation of ribs of height H1 and ribs of height H2 separated by a groove with a flat bottom.
  • said tubes may comprise secondary ribs of height H ' ⁇ 0.5.H and typically located at mid-distance between two ribs of height H or height H 1 and H 2.
  • said tubes may furthermore comprise an axial groove creating in said ribs notches with a typically triangular profile with a rounded top, said top having an angle ⁇ ranging from 25 to 65.degree. bottom or top is at a distance h from the bottom of said grooves from 0 to 0.2 mm.
  • the grooved tubes according to the invention can be made of Cu and alloys of Cu, Al and alloys of Al, Fe and Fe alloys. These tubes, typically not fluted, can be obtained typically by grooving tubes, or possibly by flat grooving of a metal strip and forming a welded tube. These tubes may be of typically round cross section, oval or rectangular. They may be of oval or rectangular section, particularly in the case of welded tubes.
  • Another subject of the invention consists of heat exchangers using tubes according to the invention.
  • these exchangers may comprise heat exchange fins in contact with said tubes on a fraction of said tubes, in which the maximum distance between said fins and said tubes, on the fraction that is not in contact. is less than 0.01 mm, and preferably less than 0.005 mm.
  • Another object of the invention is constituted by the use of tubes according to the invention, and by the use of exchangers according to the invention, tubes and exchangers in which the coolant or coolant fluid is used as a monophasic fluid typically chosen. among: water, aqueous glycol solutions typically with 30% glycol, K formate and / or actetate solutions, sorbets, organic liquids, liquid CO 2 .
  • the coolant or heat transfer fluid can be used as a typically selected monophasic fluid with dynamic viscosity characteristics of between 0.5 and 30 mPa and a Prandtl number of between 5 and 160.
  • Grooved copper tubes according to the invention having a diameter of 12.0 mm outside diameter, tubes referenced A, B, C, D and G, and control tubes referenced E, F and G, the tube referenced L corresponding to a smooth control tube.
  • other tests have been carried out of other diameters De, tests which have shown that the grooving according to the invention made it possible to choose a thickness Tf with a groove bottom such that Tf / De is equal to 0.023 ⁇ 0.005, which leads to a thickness Tf substantially lower than the standard thickness and therefore a significant weight gain, the tube retaining satisfactory mechanical performance of use. Ref.
  • tubes C and G have asymmetrical grooves while the grooves of the tubes A, B, D, E and F are symmetrical.
  • the tubes were tested with two types of monophasic fluids: on the one hand an aqueous solution of 30% by volume of monopropylene glycol, and on the other hand a K formate solution of up to -30.degree. last having a freezing temperature of -55 ° C, against -40 ° C for monopropylene glycol solution.
  • the tests were carried out at + 5 ° C and at -5 ° C.
  • the dynamic viscosity (m.Pa.s) of the solutions used at these two temperatures was measured: T Monopropylene glycol (m.Pa.s) K formate solution -5 ° C 20 4.5 + 5 ° C 10 2.5
  • the number of Prandtl for monopropylene glycol was measured: 142 to -5 ° C. and 80 to + 5 ° C.
  • the number of Prandtl is 20 to + 5 ° C.
  • the tubes A, B, C, D and G have a weight per meter of 125 g / m, whereas the control tubes E and F, which correspond to grooved tubes of the state of the art, have a weight per meter 140 g / m, the tube L having a weight per meter of 130 g / m.
  • the weight gain is 10% compared to the grooved tubes of the state of the art and 4% compared to the smooth tube generally used in this application.
  • the heat exchange coefficient Hi was measured as a function of the pressure drop dP (Pa / m).
  • the following table gives the values of Hi for a pressure drop of 14 KPa / m and 16 KPa / m: DP KPa / m HiA HiC HiG HiF HiE HiL 14 3209 2777 2640 2300 2300 2300 16 3664 3300 3050 2936 2709 2709
  • the tube A has, compared to the smooth tube L, and also compared to grooved tubes F and E of the state of the art, a gain of 39%, which is considerable.
  • the tests at + 5 ° C. were carried out on the tubes A, B, C, E, F and L.
  • the heat exchange coefficient Hi was measured as a function of the pressure drop dP (Pa / m).
  • the following table gives the values of Hi for a pressure drop of 4 KPa / m, 8 KPa / m and 12 KPa / m: Dp KPa / m HiA HiB HiC HiE HiF HiL 4 2545 2273 1591 1591 1591 1591 8 4000 3545 2455 2273 2273 2273 12 4545 4409 3409 3045 2909 2773
  • the heat exchange coefficient Hi was measured as a function of the pressure drop dP (Pa / m).
  • the following table gives the values of Hi for a pressure drop of 4, 8 and 12 KPa / m: Dp KPa / m HiA HiB HiC HiE HiF HiL 4 3256 2325 2791 2325 2325 2325 8 4000 3674 4280 3442 3674 3116 12 4744 4465 5000 4465 4465 3581
  • the tube A is extremely efficient and advantageous.
  • tubes B and C may be advantageous.
  • the tube B may be in the case of a heat exchange at + 5 ° C with an aqueous monopropylene glycol solution as a fluid flowing in the exchanger.
  • the tube C may be advantageous in the case of a heat exchange at + 5 ° C with an aqueous solution of K formate as a fluid flowing in the exchanger.
  • the invention has great advantages.
  • the invention allows on the one hand to have heat exchanger tubes of high efficiency with regard to heat exchange with a very high exchange coefficient Hi.
  • the relatively small number of ribs also helps to lighten the tubes.
  • the tubes according to the invention are particularly suitable for all single-phase fluid heat exchange circuits, especially those using aqueous solutions, which is very advantageous in practice.

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  • 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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP04007195A 2003-05-26 2004-03-25 Tubes rainurés pour échangeurs thermiques à fluide monophasique, typiquement aqueux Expired - Lifetime EP1482269B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04007195T PL1482269T3 (pl) 2003-05-26 2004-03-25 Rury rowkowane dla wymienników ciepła z czynnikiem jednofazowym, typowo wodnym

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0306316A FR2855601B1 (fr) 2003-05-26 2003-05-26 Tubes rainures pour echangeurs thermiques a fluide monophasique, typiquement aqueux
FR0306316 2003-05-26

Publications (3)

Publication Number Publication Date
EP1482269A2 EP1482269A2 (fr) 2004-12-01
EP1482269A3 EP1482269A3 (fr) 2005-11-09
EP1482269B1 true EP1482269B1 (fr) 2006-11-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04007195A Expired - Lifetime EP1482269B1 (fr) 2003-05-26 2004-03-25 Tubes rainurés pour échangeurs thermiques à fluide monophasique, typiquement aqueux

Country Status (9)

Country Link
US (1) US7267166B2 (pl)
EP (1) EP1482269B1 (pl)
AT (1) ATE347083T1 (pl)
DE (1) DE602004003422T2 (pl)
DK (1) DK1482269T3 (pl)
ES (1) ES2278241T3 (pl)
FR (1) FR2855601B1 (pl)
PL (1) PL1482269T3 (pl)
PT (1) PT1482269E (pl)

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FR2893124B1 (fr) * 2005-11-09 2008-03-21 Trefimetaux Tubes rainures pour echangeurs thermiques a resistance a l'expansion amelioree
CN100365370C (zh) * 2005-12-20 2008-01-30 金龙精密铜管集团股份有限公司 一种内螺纹传热管
JP2007178010A (ja) * 2005-12-27 2007-07-12 Calsonic Kansei Corp 熱交換器用インナーフィン
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JP2009162395A (ja) * 2007-12-28 2009-07-23 Showa Denko Kk 二重管式熱交換器
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JP2011144989A (ja) * 2010-01-13 2011-07-28 Mitsubishi Electric Corp 熱交換器用の伝熱管、熱交換器、冷凍サイクル装置及び空気調和装置
US10697629B2 (en) * 2011-05-13 2020-06-30 Rochester Institute Of Technology Devices with an enhanced boiling surface with features directing bubble and liquid flow and methods thereof
JP2013092335A (ja) * 2011-10-27 2013-05-16 Mitsubishi Alum Co Ltd 熱交換器用アルミニウム細管およびこれを用いた熱交換器
IN2015DN03287A (pl) * 2012-09-21 2015-10-09 Ng1 Technologies Llc
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EP3377838B1 (en) * 2015-11-17 2022-02-23 Arvind Jaikumar Pool boiling enhancement with feeder channels supplying liquid to nucleating regions
GB2570005B (en) * 2018-01-09 2022-09-14 Paralloy Ltd Pipes for chemical processing
US12326304B2 (en) * 2019-11-29 2025-06-10 Ma Aluminum Corporation Inner spiral grooved tube with excellent heat transfer property and heat exchanger
JP6868146B1 (ja) * 2020-06-29 2021-05-12 株式会社クボタ 流体撹拌要素を具える熱分解管
CN111854503A (zh) * 2020-07-13 2020-10-30 珠海格力电器股份有限公司 冷凝管、冷凝器及空调系统
CA3139673A1 (en) * 2020-12-02 2022-06-02 Carrier Corporation Heat transfer tube for air conditioner application
GB202104924D0 (en) * 2021-04-07 2021-05-19 Paralloy Ltd Axial reformer tube
CA3215741A1 (en) * 2021-04-07 2022-10-13 Paralloy Limited Axial reformer tube

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Also Published As

Publication number Publication date
EP1482269A3 (fr) 2005-11-09
US7267166B2 (en) 2007-09-11
PT1482269E (pt) 2007-03-30
ATE347083T1 (de) 2006-12-15
EP1482269A2 (fr) 2004-12-01
DE602004003422T2 (de) 2008-02-21
FR2855601B1 (fr) 2005-06-24
DK1482269T3 (da) 2007-04-02
DE602004003422D1 (de) 2007-01-11
US20050045319A1 (en) 2005-03-03
PL1482269T3 (pl) 2007-04-30
ES2278241T3 (es) 2007-08-01
FR2855601A1 (fr) 2004-12-03

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