US20120181007A1 - Flat tube for heat exchange - Google Patents

Flat tube for heat exchange Download PDF

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Publication number
US20120181007A1
US20120181007A1 US13/498,298 US201013498298A US2012181007A1 US 20120181007 A1 US20120181007 A1 US 20120181007A1 US 201013498298 A US201013498298 A US 201013498298A US 2012181007 A1 US2012181007 A1 US 2012181007A1
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US
United States
Prior art keywords
flat tube
holes
heat exchange
mpa
pressure
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.)
Abandoned
Application number
US13/498,298
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English (en)
Inventor
Jihong Liu
Hyunyoung Kim
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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 Daikin Industries Ltd filed Critical Daikin Industries Ltd
Assigned to DAIKIN INDUSTRIES, LTD. reassignment DAIKIN INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, HYUNYOUNG, LIU, JIHONG
Publication of US20120181007A1 publication Critical patent/US20120181007A1/en
Abandoned 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels

Definitions

  • the present invention relates to a flat tube for heat exchange in which plural through holes are formed.
  • flat tubes for heat exchange such as the one described in patent citation 1 (JP-A. No. 10-132424) have been used in evaporators of air conditioners and so forth,
  • the flat tube is integrally molded by, for example, extrusion-molding an aluminum alloy or the like, and plural through holes with circular cross-sections are arranged side-by-side in one row or plural rows.
  • Heat exchange is performed between refrigerant that passes through the insides of the through holes and a medium such as air that passes over the outer periphery of the flat tube.
  • CO 2 refrigerant which has a working pressure equal to or greater than 10 MPa
  • whose working pressure is much higher than that of HFC refrigerant has come to be used, and a variety of flat tubes that can withstand the high pressure of CO 2 refrigerant have been proposed.
  • a flat tube for heat exchange of a first invention is a flat tube for heat exchange in which plural through holes with circular cross-sections through which refrigerant passes are arranged in one row.
  • t 1 /R is a value in which a thickness t 1 of partition portions partitioning adjacent two of the through holes has been made dimensionless by a radius R of the through holes and t 2 /R is a value in which an outer peripheral thickness t 2 that is a thickness from a flat surface of an outer periphery of the flat tube to the through holes has been made dimensionless by the radius R, in a case where the internal pressure of the through holes is 10.0 to 90.0 MPa
  • a flat tube for heat exchange of a second invention is the flat tube for heat exchange of the first invention, wherein in a case where the internal pressure of the through holes is 20.0 to 80.0 MPa, the relationship of
  • a flat tube for heat exchange of a third invention is the flat tube for heat exchange of the first invention or the second invention, wherein in a case where the internal pressure of the through holes is 30.0 to 80.0 MPa, the relationship of
  • a flat tube for heat exchange of a fourth invention is the flat tube for heat exchange of any of the first invention to the third invention, wherein the flat tithe is manufactured from an elasto-plastically deformable material.
  • the flat tube for heat exchange is manufactured from an elasto-plastically deformable material, so in a case where the above relational expression holds true, the target pressure-resisting strength can be ensured more reliably and it becomes possible to make the thickness of the flat tube thinnest.
  • the flat tube for heat exchange can ensure the target pressure-resisting strength and the thickness of the flat tube becomes thinnest; because of this, downsizing of the flat tube for heat exchange and a reduction in cost can be achieved.
  • the flat tube for heat exchange can ensure the target pressure-resisting strength and it becomes possible to make the thickness of the flat tube thinnest.
  • the flat tube for heat exchange can ensure the target pressure-resisting strength and it becomes possible to make the thickness of the flat tube thinnest.
  • the target pressure-resisting strength can be ensured more reliably and the thickness of the flat tube becomes thinnest, so downsizing and a reduction in cost can be achieved.
  • FIG. 1 is a partial front view of a flat tube for heat exchange pertaining to an embodiment of the present invention.
  • FIG. 2 is a schematic view of an analysis object corresponding to the flat tube for heat exchange of FIG. 1 .
  • FIG. 3 is a graph showing isobars of the pressure-resisting strength of the flat tube for heat exchange of FIG. 1 in a case where the radius of the through holes is 0.2 mm (a case using aluminum alloy A3003-O).
  • FIG. 4 is a graph showing isobars of the pressure-resisting strength of the flat tube for heat exchange of FIG. 1 in a case where the radius of the through holes is 0.3 mm (a case using aluminum alloy A3003-O).
  • FIG. 5 is a graph showing isobars of the pressure-resisting strength of the flat tube for heat exchange of FIG. 1 in a case where the radius of the through holes is 0.4 mm (a case using aluminum alloy A3003-O).
  • FIG. 6 is a graph showing isobars of the pressure-resisting strength of the flat tube for heat exchange of FIG. 1 in a case where the radius of the through holes is 0.5 mm (a case using aluminum alloy A3003-O)).
  • FIG. 7 is a graph showing isobars of the pressure-resisting strength of the flat tube for heat exchange of FIG. 1 in a case where the radius of the through holes is 0.6 mm (a case using aluminum alloy A3003-O).
  • FIG. 8 is a graph in which the plural graphs in the cases where the radius of the through holes was changed are superimposed on each other and shows isobars of the pressure-resisting strength of the flat tube for heat exchange of FIG. 1 (cases using aluminum alloy A3003-O).
  • FIG. 9 is a graph in which the graph of FIG. 8 is approximated and shows isobars of the pressure-resisting strength of the flat tube for heat exchange of FIG. I (cases using aluminum alloy A3003-O).
  • FIG. 10 is a graph corresponding to FIG. 9 in a case using aluminum alloy A1050-O.
  • a flat tube 1 for heat exchange shown in FIG. 1 is a multi-hole tube having a flat elliptical cross-section in which plural through holes 3 with circular cross-sections through which refrigerant passes are arranged laterally in one row inside a body 2 of the flat tube 1 .
  • the through holes 3 have completely round circular cross-sections.
  • the flat tube 1 for heat exchange is manufactured by integral molding by extrusion-molding an elasto-plastically deformable material such as an aluminum alloy.
  • the flat tube 1 for heat exchange can ensure the targeted pressure-resisting strength (that is, the target pressure-resisting strength) and the thickness of the flat tube 1 becomes thinnest; because of this, downsizing of the flat tube 1 for heat exchange and a reduction in cost can be achieved.
  • the present invention is designed considering tensile strength which greatly exceeds yield stress in aluminum materials and the like, assumes that t 1 , t 2 , and R are set in such a way that the value of (t 2 /R)/(t 1 /R) falls around a central value of 0.35 within the range of 0.28 to 0.42, and differs from settings that greatly deviate from this range (e.g., designs that consider only yield stress).
  • FIGS. 3 to 7 show graphs in which the radius R of the through holes 3 is fixed at 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm, isobars of pressure resistance P when t 1 /R is taken on the horizontal axis and t 2 /R is taken on the vertical axis are numerically analyzed and found by computer simulation, and the isobars are shown.
  • Aluminum alloy A3003-O is used in the analyses of the graphs shown in FIGS. 3 to 7 .
  • the material properties of aluminum alloy A3003-O are shown in Table 1 below.
  • FIG. 9 shows a graph in which, in order to make them easier to see, the isobars in the graph of FIG. 8 are approximated in order to consolidate the isobars into single lines per pressure resistance P in 10 MPa intervals.
  • the present inventors performed the same analysis as that of aluminum alloy A3003-O also in regard to another aluminum alloy A1050-O other than aluminum alloy A3003-O (that is, in which the radius R of the through holes 3 is fixed at 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm, and isobars of pressure resistance P when t 1 /R is taken on the horizontal axis and t 2 /R is taken on the vertical axis are numerically analyzed and found by computer simulation).
  • the material properties of aluminum alloy A1050-O are shown in Table 4 below.
  • FIG. 10 shows analysis results in a case where the same analysis as that of aluminum alloy A3003-O is performed using aluminum alloy A1050-O.
  • FIG. 10 corresponds to FIG. 9 and shows analysis results of aluminum alloy A1050-O.
  • the flat tube 1 for heat exchange of the embodiment is a flat tube for heat exchange in which plural through holes 3 with circular cross-sections through which refrigerant passes are arranged in one row, wherein if t 1 /R is a value in which a thickness t 1 of partition portions 4 partitioning adjacent two of the through holes 3 has been made dimensionless by a radius R of the through holes 3 and t 2 /R is a value in which an outer peripheral thickness t 2 that is a thickness from a flat surface of an outer periphery of the flat tube 1 to the through holes 3 has been made dimensionless by the radius R, in a case where the internal pressure of the through holes 3 is 10.0 to 90.0 MPa, the thickness t 1 of the partition portions 4 , the outer peripheral thickness t 2 , and the radius R of the through holes 3 are set in such a way that the relationship of
  • the flat tube 1 for heat exchange of the embodiment is manufactured from an elasto-plastically deformable material such as an aluminum alloy, so the target pressure-resisting strength can be ensured more reliably and the thickness of the flat tube becomes thinnest, so downsizing and a reduction in cost can be achieved.
  • the present invention is not limited to this, it suffices for the material to be an elasto-plastically deformable material, and in addition to aluminum and aluminum alloys, the present invention is widely applicable to materials ranging from metals such as copper and iron to resins.
  • the present invention can be applied to a variety of flat tubes for heat exchange equipped with plural through holes.
  • Patent Citation 1 JP-A No. 10-13242.4

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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)
US13/498,298 2009-09-30 2010-09-30 Flat tube for heat exchange Abandoned US20120181007A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2009-228473 2009-09-30
JP2009228473 2009-09-30
JP2009-297914 2009-12-28
JP2009297914 2009-12-28
PCT/JP2010/067068 WO2011040518A1 (ja) 2009-09-30 2010-09-30 熱交換用扁平管

Publications (1)

Publication Number Publication Date
US20120181007A1 true US20120181007A1 (en) 2012-07-19

Family

ID=43826330

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/498,298 Abandoned US20120181007A1 (en) 2009-09-30 2010-09-30 Flat tube for heat exchange

Country Status (5)

Country Link
US (1) US20120181007A1 (ja)
EP (1) EP2485006A4 (ja)
JP (1) JP2011153814A (ja)
CN (1) CN102510992A (ja)
WO (1) WO2011040518A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10473401B2 (en) * 2015-07-28 2019-11-12 Sanden Holdings Corporation Heat exchanger
US20210140720A1 (en) * 2019-11-11 2021-05-13 Mahle International Gmbh Tube body for a heat exchanger and heat exchanger

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013127341A (ja) * 2011-12-19 2013-06-27 Daikin Industries Ltd 熱交換器
EP3009779B1 (en) * 2014-10-15 2019-05-15 VALEO AUTOSYSTEMY Sp. Z. o.o. A tube of the gas cooler for the condenser

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6357522B2 (en) * 1998-10-01 2002-03-19 Behr Gmbh & Co. Multi-channel flat tube
US20040251013A1 (en) * 2003-05-23 2004-12-16 Masaaki Kawakubo Heat exchange tube having multiple fluid paths
US6854512B2 (en) * 2002-01-31 2005-02-15 Halla Climate Control Corporation Heat exchanger tube and heat exchanger using the same
US6907922B2 (en) * 2003-06-23 2005-06-21 Denso Corporation Heat exchanger
US20060016583A1 (en) * 2000-11-02 2006-01-26 Behr Gmbh & Co. Condenser and tube therefor
US20060151160A1 (en) * 2002-10-02 2006-07-13 Showa Denko K.K. Heat exchanging tube and heat exchanger

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6432424A (en) 1987-07-28 1989-02-02 Matsushita Electric Ind Co Ltd Production of magnetic recording medium
JP3214373B2 (ja) 1996-10-30 2001-10-02 ダイキン工業株式会社 偏平伝熱管
JP3313086B2 (ja) * 1999-06-11 2002-08-12 昭和電工株式会社 熱交換器用チューブ
WO2002042706A1 (fr) * 2000-11-24 2002-05-30 Showa Denko K. K. Tube d'echangeur de chaleur et echangeur de chaleur
JP2006336873A (ja) * 2002-10-02 2006-12-14 Showa Denko Kk 熱交換器用チューブ及び熱交換器
DE102005016540A1 (de) * 2005-04-08 2006-10-12 Behr Gmbh & Co. Kg Mehrkanalflachrohr
CN101532589A (zh) * 2008-03-10 2009-09-16 金龙精密铜管集团股份有限公司 一种金属扁管

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6357522B2 (en) * 1998-10-01 2002-03-19 Behr Gmbh & Co. Multi-channel flat tube
US20060016583A1 (en) * 2000-11-02 2006-01-26 Behr Gmbh & Co. Condenser and tube therefor
US6854512B2 (en) * 2002-01-31 2005-02-15 Halla Climate Control Corporation Heat exchanger tube and heat exchanger using the same
US20060151160A1 (en) * 2002-10-02 2006-07-13 Showa Denko K.K. Heat exchanging tube and heat exchanger
US20040251013A1 (en) * 2003-05-23 2004-12-16 Masaaki Kawakubo Heat exchange tube having multiple fluid paths
US6907922B2 (en) * 2003-06-23 2005-06-21 Denso Corporation Heat exchanger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10473401B2 (en) * 2015-07-28 2019-11-12 Sanden Holdings Corporation Heat exchanger
US20210140720A1 (en) * 2019-11-11 2021-05-13 Mahle International Gmbh Tube body for a heat exchanger and heat exchanger
US11859919B2 (en) * 2019-11-11 2024-01-02 Mahle International Gmbh Tube body for a heat exchanger and heat exchanger

Also Published As

Publication number Publication date
WO2011040518A1 (ja) 2011-04-07
EP2485006A4 (en) 2013-12-11
CN102510992A (zh) 2012-06-20
JP2011153814A (ja) 2011-08-11
EP2485006A1 (en) 2012-08-08

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AS Assignment

Owner name: DAIKIN INDUSTRIES, LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LIU, JIHONG;KIM, HYUNYOUNG;SIGNING DATES FROM 20110408 TO 20110411;REEL/FRAME:027929/0868

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION