EP1527311A1 - Echangeur de chaleur a tuyaux plats - Google Patents

Echangeur de chaleur a tuyaux plats

Info

Publication number
EP1527311A1
EP1527311A1 EP03766307A EP03766307A EP1527311A1 EP 1527311 A1 EP1527311 A1 EP 1527311A1 EP 03766307 A EP03766307 A EP 03766307A EP 03766307 A EP03766307 A EP 03766307A EP 1527311 A1 EP1527311 A1 EP 1527311A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
fin
rib
exchanger according
corrugated
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
Application number
EP03766307A
Other languages
German (de)
English (en)
Other versions
EP1527311B1 (fr
Inventor
Rainer Richter
Gerrit WÖLK
Ralf Bochert
Wolfgang Kramer
Martin Kaspar
Arnold Rehm
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.)
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
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 Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP1527311A1 publication Critical patent/EP1527311A1/fr
Application granted granted Critical
Publication of EP1527311B1 publication Critical patent/EP1527311B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
    • F28F1/128—Fins with openings, e.g. louvered fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0084—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0091—Radiators
    • F28D2021/0094—Radiators for recooling the engine coolant

Definitions

  • the invention relates to a heat exchanger, in particular for motor vehicles, with a soldered heat transfer network consisting of flat tubes and corrugated fins, according to the preamble of patent claim 1, known from US Pat. No. 5,271,458.
  • the flat tube is replaced by a liquid and / or vaporous medium, eg. B.
  • Coolant or refrigerant flows through, which dissipates its heat to the ambient air or absorbs heat from the ambient air.
  • two very different heat capacity flows are in heat exchange with each other.
  • additional measures must be taken on the air side to improve the heat transfer there. This is done by arranging corrugated fins between the flat tubes, which increases the heat exchange area on the air side.
  • the surface of the corrugated fins is slotted, that is, covered with gills, which break up the boundary layer flows that form and a deflection of the air flow from one flow channel to the other and thus an extension of the flow path for the air.
  • corrugated ribs there are basically two different types of corrugated ribs, the so-called V-type with rib surfaces arranged at an angle to one another, known from US Pat. No. 3,250,325.
  • the second embodiment of the corrugated fin is the so-called U-type, in which the fin surfaces and thus the gills arranged on them are aligned parallel to one another - this U-type was known from US Pat. No. 5,271,458. From a thermodynamic point of view, the U-type has several advantages over the V-type, namely a relatively even flow through the roughly rectangular rib channel, a uniform flow deflection through the gills, a higher air throughput and thus a higher heat transfer performance.
  • the V-type is more advantageous because with a constant rib bending radius for the shaft crest, different rib densities can be produced by gathering or pulling the corrugated strip apart.
  • the so-called parallel rib is also determined by the bending radius of the wave crest, the rib density or the rib spacing.
  • Another disadvantage of the known parallel rib is that the gill length is dependent on the rib bending radius, i. H. the larger the radius, the shorter the gill, which has a negative impact on performance.
  • the well-known wave crest formed by a constant curvature is replaced by an arch piece which is composed of three sections of different curvatures: the middle section has a comparatively small curvature, ie , H. it is almost flat and is therefore largely against the outer surface of the pipe wall.
  • the radius of curvature of the arc piece is preferably greater in the central region than a rib height RH of the corrugated fin, particularly preferably 5 to 15 times the rib height RH.
  • a middle section is adjoined by two outer sections with relatively large curvatures, it being possible for the two curvatures to be borrowed differently, so that the entire arch piece has an asymmetrical course to the central plane.
  • a first outer section preferably has a radius of curvature R2 which is less than half a rib height RH of the corrugated fin, particularly preferably 3 to 20% of the rib height RH.
  • a radius of curvature R3 of the second outer section of the curved piece is preferably at least as large as the radius of curvature R2 of the first outer section.
  • This rib geometry in particular that of the curved piece, can be produced relatively easily on conventional rib rollers.
  • the advantages of a parallel or rectangular rib are retained, ie a relatively wide soldering area with good heat transfer and possibly one large gill length, which extends almost over the entire height of the ribs. If the rib surfaces deviate somewhat (up to about 6 degrees) from the parallelism, in which case they can still be regarded as essentially parallel within the scope of the invention, the thermodynamic advantages of the parallel rib are hardly affected.
  • the rib geometry according to the invention can be used in particular in motor vehicle heat exchangers such as coolant coolers, radiators, condensers and evaporators.
  • the rib surfaces are covered with gills, which preferably have a gill depth LP in a range from 0.5 to 1.5 mm, particularly advantageously in a range from 0.7 to 1.1 mm, with a gill angle between 20 and 35 degrees, particularly advantageously between 24 and 30 degrees.
  • gills act antesstei- hesitantly, because thereby the deflection of the air is improved by a channel in the neighboring, in turn resulting in a longer flow path for 'results in the air.
  • the gill depth is . in the range of 0.9 to 1.1 mm with a gill angle of 23 to 30 degrees, favorable for a pipe / fin system with a depth of 40 to 52 mm and a fin density of 45 to 65 fins / dm, which means a fin spacing of 1.538 corresponds to up to 2.222 mm.
  • the rib height for such a system is advantageously 7 to 9 mm.
  • FIG. 3 shows a further longitudinal section in the plane III-III according to FIG. 2.
  • Fig. 1 shows a so-called parallel rib 1, the flat tubes shown only partially between two 2, 3 extends.
  • the parallel or corrugated fin 1 and the flat tubes 2, 3 form a soldered network, not shown, of a heat exchanger, for.
  • B. a coolant cooler for cooling an internal combustion engine of a motor vehicle or a condenser for a motor vehicle air conditioning system.
  • the corrugated fin 1 has in each case two mutually parallel, flat ribs surfaces 4, 5, which are "connected by an arc stucco 6.
  • the sheet stucco 6 located respectively on the flat tubes 2, 3 and is soldered to them.
  • the planar rib surfaces 4, 5 are equipped with gills 7 which have a longitudinal extension LL
  • the corrugated fin 1 has a fin height RH which is greater than the gill length LL
  • the fin surfaces 4, 5, the arch piece 6 and the tube wall 2, 3 each form an approximately rectangular fin channel 8
  • the corrugated fin 1 has a specific fin density, which is characterized by the fin pitch, ie the dimension FP.
  • All three sections are formed by radii, the middle section having a relatively large radius R1 of approximately 50 to 70 mm.
  • the two outer radii R2 and R3 are considerably smaller, ie the radius R2 is in the range from 0.4 to 0.6 mm, while the radius R3 is greater than or equal to the radius R2.
  • R3 is in the range of 0.6 to 1.1 or 1.3 mm.
  • Fig. 2 shows a longitudinal section in the plane 11-11, i. H. through the rib channel 8.
  • the rib surface 5 has a gill field 9, which is composed of a plurality of individual gills 7.
  • the rib 5 has a rib depth RT, i. H. an extension in the air flow direction X.
  • Fig. 3 shows a section in the plane III-III in Fig.2, i. H. through the gill area 9 of the rib surface 5.
  • the gill area consists of front gills 7a rising to the right in the drawing, a central roof-shaped double gill 7b and rear gills 7c falling to the right.
  • the gills 7a, 7b, 7c are each inclined at a gill angle ⁇ .
  • gills 7a, 7c have a dimension LP which is referred to as the gill depth.
  • the boundary layer of the air flow in the rib channels is broken up by the gills 7 and deflected from one rib channel 8 into the adjacent rib channel. This results in a longer flow path for the air flow, which increases the heat transfer.
  • the deflection of the air flow depends on the gill angle ⁇ and the gill depth LP.
  • the first embodiment relates to a condenser for an air conditioning system of a motor vehicle.
  • the flat tubes of the condenser are thus of refrigerant, e.g. B. flows through R 134a.
  • a heat exchanger network consisting of flat tubes and a parallel fin with the following dimensions is provided for such a condenser: Fin depth RT: 12 ⁇ RT ⁇ 20 mm.
  • Rib pitch FP 1.33 mm ⁇ FP ⁇ 1.818 mm, corresponding to a rib density of 55 to 75 ribs / dm, gill angle ⁇ : 24 ° ⁇ ⁇ 30 °, gill length LL: 6.4 mm ⁇ LL ⁇ 7.2 mm, rib height RH: 6 mm ⁇ RH ⁇ 10 mm, plank depth LP: 0.7 mm ⁇ LP ⁇ 1, 1 mm,
  • Ratio of Kienentiefe LP to rib pitch FP 0.385 ⁇ LP / FP ⁇ 0.825, radius of curvature R1 of the middle section of the elbow:
  • a parallel fin system with the aforementioned dimensions is superior to a conventional rib system with a V-shaped rib in many respects, namely with regard to the air flow rate, the flow deflection, the homogenization of the flow speed and temperature profile and thus the heat transfer performance.
  • Rib pitch FP 1, 538 ⁇ FP ⁇ 2.222 mm, corresponding to a rib density of 45 to 65 ribs / dm
  • This system which is much deeper than the first embodiment, also brings a significant increase in performance compared to a comparable V-rib.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Echangeur de chaleur, en particulier pour véhicules à moteur, doté d'un réseau échangeur de chaleur soudé à l'étain et constitué de tuyaux plats (2, 3) et de nervures ondulées (1). Dans les tuyaux plats (2, 3) peut circuler un milieu liquide et / ou sous forme de vapeur et dans les nervures ondulées peut circuler de l'air. Une nervure ondulée possède deux faces (4, 5) essentiellement parallèles l'une à l'autre et reliées l'une à l'autre par une partie incurvée (6) soudée à l'étain avec un tuyau plat, ladite partie incurvée comportant trois segments (6a, 6b, 6c) qui présentent une incurvation différente.
EP03766307.7A 2002-07-31 2003-07-25 Echangeur de chaleur a tuyaux plats Expired - Lifetime EP1527311B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10235038 2002-07-31
DE10235038A DE10235038A1 (de) 2002-07-31 2002-07-31 Flachrohr-Wärmeübertrager
PCT/EP2003/008251 WO2004013559A1 (fr) 2002-07-31 2003-07-25 Echangeur de chaleur a tuyaux plats

Publications (2)

Publication Number Publication Date
EP1527311A1 true EP1527311A1 (fr) 2005-05-04
EP1527311B1 EP1527311B1 (fr) 2016-05-04

Family

ID=30128586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03766307.7A Expired - Lifetime EP1527311B1 (fr) 2002-07-31 2003-07-25 Echangeur de chaleur a tuyaux plats

Country Status (9)

Country Link
US (1) US7882708B2 (fr)
EP (1) EP1527311B1 (fr)
JP (1) JP2005534888A (fr)
CN (1) CN100373121C (fr)
AU (1) AU2003255295A1 (fr)
BR (1) BR0305705A (fr)
DE (1) DE10235038A1 (fr)
WO (1) WO2004013559A1 (fr)
ZA (1) ZA200409593B (fr)

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Also Published As

Publication number Publication date
AU2003255295A1 (en) 2004-02-23
JP2005534888A (ja) 2005-11-17
US20050229630A1 (en) 2005-10-20
EP1527311B1 (fr) 2016-05-04
BR0305705A (pt) 2004-10-19
US7882708B2 (en) 2011-02-08
ZA200409593B (en) 2005-09-08
DE10235038A1 (de) 2004-02-12
CN100373121C (zh) 2008-03-05
WO2004013559A1 (fr) 2004-02-12
CN1672006A (zh) 2005-09-21

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