WO2001023823A1 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
WO2001023823A1
WO2001023823A1 PCT/EP1999/007412 EP9907412W WO0123823A1 WO 2001023823 A1 WO2001023823 A1 WO 2001023823A1 EP 9907412 W EP9907412 W EP 9907412W WO 0123823 A1 WO0123823 A1 WO 0123823A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubes
collector
tube
heat exchanger
interior
Prior art date
Application number
PCT/EP1999/007412
Other languages
French (fr)
Inventor
Edward James Morley
Morten Syslak
Clemens Sodeik
Antonio Baldantoni
Original Assignee
Norsk Hydro Asa
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 Norsk Hydro Asa filed Critical Norsk Hydro Asa
Priority to PCT/EP1999/007412 priority Critical patent/WO2001023823A1/en
Priority to AU64686/99A priority patent/AU6468699A/en
Publication of WO2001023823A1 publication Critical patent/WO2001023823A1/en

Links

Classifications

    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0008—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium
    • F28D7/0025—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being flat tubes or arrays of tubes
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0202—Header boxes having their inner space divided by partitions
    • F28F9/0204—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions
    • F28F9/0214—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions having only longitudinal partitions

Definitions

  • the invention relates to a heat exchanger with first set of at least transversely spaced substantially tubular collectors and a set of tubes having a substantially flat cross-section which extends between the collectors and of which the mutually opposed ends are connected to a respective associated collector so that the interior of the tube communicates with the interior of each collector and a first medium which is supplied to a collector can flow through the interior of this collector.
  • Such a heat exchanger is generally known, see WO-A-98.51983, and are generally used as condensors in air conditioning apparatus, wherein there is a heat exchanging process between a first fluidum flowing internally and air or any other gas flowing around the tubes.
  • Fig.1 is a cross- section of number of flat tubes positioned in flat heat exchanging contact;
  • Fig. 2 is a side view of a part of Fig. 1
  • Fig. 3 is a side view of a heat exchanger composed with parts according to Fig. 1;
  • Fig. 4 is a cross-section according to line IV -IV in Fig. 3
  • Fig. 5 is a side view partially in cross-section of a modified embodiment of a heat exchanger composed of flat tubes positioned according to the invention
  • Fig. 6 is a cross-section according to lines V-V of fig. 4.
  • Flat oval tubes are generally known in the art and comprise a flat tube having parallel refrigerant passages in its interior and flat upper and lower walls and a plurality of reinforcing walls connecting the upper and lower wails thereby forming the parallel passages.
  • Such tubes are made out of aluminium and are produced by the extrusion process, resulting in so-called MPE-tubes (Multiple Port Extrusion and Tubes) although other production techniques can be used as well such as e.g. described in EP-A-0 781 610.
  • Fig. 1 and 2 there is shown a number of such flat tubes 1 , which are positioned in parallel relationship such that their flat walls are in heat exchanging contact with each other.
  • the outer walls of each tube 1 may be cladded with a brazing alloy (e.g. AlSi) and flux (e.g. Nocolok), so that after positioning the tubes the contacting flat walls can be brazed together in order to obtain an adequate heat exchanging contact between the tubes 1.
  • a brazing alloy e.g. AlSi
  • flux e.g. Nocolok
  • the heat exchanger comprises a first set of manifolds 10,11 positioned in parallel relationship.
  • a number of tubes 12 is extending _from one manifold 10 to the other manifold 11 and the interior of the tubes 12 is in communication with the interior of the manifolds 10,11.
  • the tubes 12 might be flat tubes of the MPE-type but any other tube can be used, as this part of the heat exchanger is used for heat exchanging between a fluid flowing inside the manifolds 10,11 and the tubes 12 and a fluid, mostly air flowing around the manifolds 10,11 and the tubes 12.
  • In order to improve the heat exchanging power fins 13 can be positioned between the tubes 12.
  • part of such a heat exchanger can be provided with so-called internal heat exchanger as shown in the bottom part of Fig. 3.
  • internal heat exchanger As shown in the bottom part of Fig. 3.
  • a number of flat tubes have been assembled as shown in Fig. 1 and 2, and the central tube 1 of each set is made somewhat longer than the two outer tubes, so that both ends of the central tube extends beyond the ends of the outer tubes.
  • each central tube 2 is extending through the manifolds 10 and 11 and ends within the manifolds 15 and 16, whereas the outer tubes 1 and 3 ends within the manifolds 10 and 11.
  • the fluidum flowing through the manifolds 10,11 and the appending tubes 12, 1 and 3 is not only in heat exchanging contact with the surrounding fluidum such as air, but at least in some part this fluidum is also in heat exchanging contact with the fluidum flowing through the manifolds 15, 16 and the tubes 2.
  • the thermodynamic efficiency of the process can be improved by up to 25% depending on the temperatures and fluida used.
  • the width of the tubes 1 , 2, 3 is somewhat smaller than the width of the manifolds 11,16, so that fluid passages A and B are obtained into manifold 11 and additional fluid passages C and D are obtained in manifold 16.
  • Fig. 5 and 6 there is shown a modified embodiment of a heat exchanger according to the invention.
  • Fig. 6 a number of flat tubes 20, 21 such as tubes shown in cross-section in Fig. 1 is placed in flat contact to each other.
  • the stock of tubes so formed is composed of tubes 20 having a shorter length than the tubes 21 and tubes 20 and 21 are staggered in alternating fashion.
  • Near each end of the tubes 20, 21 two manifolds 22, 23 have been provided.
  • these manifolds 22, 23 are made out of one tube 24 provided with a longitudinal separation wall 25 such that two separate tubes are formed.
  • a configuration as shown in figure 4 can also be composed of tubes of the same length which are assembled with an offset in the long axis (staggered configuration).
  • the wall is provided with a number of longitudinal holes perpendicular to the longitudinal direction of tube 24, so as to allow the end portion of the tubes 21 to extend into the manifold 23. Otherwise the outer wail 26 of manifold 22 is provided with a rectangular hole so as to allow the whole pack of tubes to be inserted in it, in such a way that the end portions of the tubes 20 ends in manifold 22.
  • the stack of flat tubes can be assembled before inserting into the manifolds, and in this stage a brazing connection can be made between the two neighbouring tubes, e.g. in that a brazing flux has been provided on the tube surfaces before assembling.

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  • 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)

Abstract

Heat exchanger with a first set of spaced tubular collectors (10,11) and a set of tubes (12) having a flat cross-section which extends between the collectors (10, 11) and a first medium which is supplied to a collecter. A second set is provided of two transversely spaced tubular collectors (15, 16) and a second set of tubes (2) having a flat cross-section which extends between the second set of collectors (15, 16) and a second medium which is supplied to a collector of the second set can flow through the interior of this collector, the interior of the tube of the second set and the interior of the other collector of the second set, and that at least one tube (12) of the first set is in flat heat-exchanging contact with at least one of the tubes (2) of the second set.

Description

Heat exchanger
The invention relates to a heat exchanger with first set of at least transversely spaced substantially tubular collectors and a set of tubes having a substantially flat cross-section which extends between the collectors and of which the mutually opposed ends are connected to a respective associated collector so that the interior of the tube communicates with the interior of each collector and a first medium which is supplied to a collector can flow through the interior of this collector.
Such a heat exchanger is generally known, see WO-A-98.51983, and are generally used as condensors in air conditioning apparatus, wherein there is a heat exchanging process between a first fluidum flowing internally and air or any other gas flowing around the tubes.
In a number of applications it is desirable to have a heat exchanging process between two fluids, or one fluid in different conditions of state, which are both flowing in a controllable manner, implying that both fluids are flowing through a tube system. For this purpose frequently co-axial tubes are used, such as disclosed in "Status Bericht des deutschen K e - und klimatechnischen Vereins Nr. 20" of November 1998, (ISBN 3-932715-00-4) page 137, Fig. 5.4-6.
Most co-axial systems are using round or substantially round tubes, which have not an optimal hydraulic diameter.
It is therefor an object of the invention to provide a heat exchanger in which the difficulties mentioned above can be avoided.
This object is achieved in that a second set of at least two transversely spaced substantially tubular collectors and a second set of tubes having a substantially flat cross-section which extends between the second set of collectors and of which the mutually opposed ends are connected to a respective associated collector so that the interior of the tube communicates with the interior of each collector of the second set and a second medium which is supplied to a collector of the second set can flow through the interior of this collector, the interior of the tube of the second set and the interior of the other collector of the second set, and that at least one tube of the first set is in flat heat-exchanging contact with at least one of the tubes of the second set. By positioning the flat tubes in a fiat heat exchanging contact it became possible to use the high efficiency of flat tubes in a so-called internal heat exchanger in which heat is exchanged between two controlled fluids flows of fluids.
Other advantages and characteristics will become clear from the following description, references being made to the annexed drawings in which
Fig.1 is a cross- section of number of flat tubes positioned in flat heat exchanging contact; Fig. 2 is a side view of a part of Fig. 1
Fig. 3 is a side view of a heat exchanger composed with parts according to Fig. 1;
Fig. 4 is a cross-section according to line IV -IV in Fig. 3
Fig. 5 is a side view partially in cross-section of a modified embodiment of a heat exchanger composed of flat tubes positioned according to the invention, Fig. 6 is a cross-section according to lines V-V of fig. 4.
Flat oval tubes are generally known in the art and comprise a flat tube having parallel refrigerant passages in its interior and flat upper and lower walls and a plurality of reinforcing walls connecting the upper and lower wails thereby forming the parallel passages. Generally such tubes are made out of aluminium and are produced by the extrusion process, resulting in so-called MPE-tubes (Multiple Port Extrusion and Tubes) although other production techniques can be used as well such as e.g. described in EP-A-0 781 610.
In Fig. 1 and 2 there is shown a number of such flat tubes 1 , which are positioned in parallel relationship such that their flat walls are in heat exchanging contact with each other. For that purpose the outer walls of each tube 1 may be cladded with a brazing alloy (e.g. AlSi) and flux (e.g. Nocolok), so that after positioning the tubes the contacting flat walls can be brazed together in order to obtain an adequate heat exchanging contact between the tubes 1. In the figures 1 and 2 there is shown an assembly comprising three tubes, which can be used as internal heat exchanger as disclosed in the above mentioned publication "Status Bericht des deutschen Kalte - und klimatechnischen Vereins".
Such a heat exchanger is shown in Fig. 3. The heat exchanger comprises a first set of manifolds 10,11 positioned in parallel relationship. A number of tubes 12 is extending _from one manifold 10 to the other manifold 11 and the interior of the tubes 12 is in communication with the interior of the manifolds 10,11. The tubes 12 might be flat tubes of the MPE-type but any other tube can be used, as this part of the heat exchanger is used for heat exchanging between a fluid flowing inside the manifolds 10,11 and the tubes 12 and a fluid, mostly air flowing around the manifolds 10,11 and the tubes 12. In order to improve the heat exchanging power fins 13 can be positioned between the tubes 12. In order to increase the thermodynamic efficiency of the system, part of such a heat exchanger can be provided with so-called internal heat exchanger as shown in the bottom part of Fig. 3. For that purpose a number of flat tubes have been assembled as shown in Fig. 1 and 2, and the central tube 1 of each set is made somewhat longer than the two outer tubes, so that both ends of the central tube extends beyond the ends of the outer tubes.
As shown in Fig. 3 an additional pass of manifolds 15 and 16 has been provided and a number of sets are shown in Fig. 1 and 2 is mounted between the double part of manifolds, in such a way that each central tube 2 is extending through the manifolds 10 and 11 and ends within the manifolds 15 and 16, whereas the outer tubes 1 and 3 ends within the manifolds 10 and 11.
In this way it is obtained that the fluidum flowing through the manifolds 10,11 and the appending tubes 12, 1 and 3 is not only in heat exchanging contact with the surrounding fluidum such as air, but at least in some part this fluidum is also in heat exchanging contact with the fluidum flowing through the manifolds 15, 16 and the tubes 2. In this way the thermodynamic efficiency of the process can be improved by up to 25% depending on the temperatures and fluida used.
In order to exactly position the end portion of the tube 1, 3 and 2 within that respective manifold 10, 11 and 15, 16 it might be an advantage to use manifolds as described in WO-A-97.945878.3. These manifolds are provided with shoulders, providing a stop for the tube ends. Alternatively tubes with shoulders could be used to define the positioning.
As shown in Fig. 4 the width of the tubes 1 , 2, 3 is somewhat smaller than the width of the manifolds 11,16, so that fluid passages A and B are obtained into manifold 11 and additional fluid passages C and D are obtained in manifold 16.
In Fig. 5 and 6 there is shown a modified embodiment of a heat exchanger according to the invention. s shown Fig. 6 a number of flat tubes 20, 21 such as tubes shown in cross-section in Fig. 1 is placed in flat contact to each other. The stock of tubes so formed is composed of tubes 20 having a shorter length than the tubes 21 and tubes 20 and 21 are staggered in alternating fashion. Near each end of the tubes 20, 21 two manifolds 22, 23 have been provided. In the embodiment shown, these manifolds 22, 23 are made out of one tube 24 provided with a longitudinal separation wall 25 such that two separate tubes are formed. A configuration as shown in figure 4 can also be composed of tubes of the same length which are assembled with an offset in the long axis (staggered configuration). The wall is provided with a number of longitudinal holes perpendicular to the longitudinal direction of tube 24, so as to allow the end portion of the tubes 21 to extend into the manifold 23. Otherwise the outer wail 26 of manifold 22 is provided with a rectangular hole so as to allow the whole pack of tubes to be inserted in it, in such a way that the end portions of the tubes 20 ends in manifold 22.
In fig. 5 there is only shown one manifold, but at the other end of the tubes 20, 21 the same configuration can be made. If needed several packs of tubes can be provided and baffles can be provided in the manifold in order to control the flow of the fluidum.
In order to have a good heat transfer contact it may be advantageous to have a good heat contact between neighbouring tubes. Therefor the stack of flat tubes can be assembled before inserting into the manifolds, and in this stage a brazing connection can be made between the two neighbouring tubes, e.g. in that a brazing flux has been provided on the tube surfaces before assembling.

Claims

Claims
1. A heat exchanger with first set of at least transversely spaced substantially tubular collectors and a set of tubes having a substantially flat cross-section which extends between the collectors and of which the mutually opposed ends are connected to a respective associated collector so that the interior of the tube communicates with the interior of each collector and a first medium which is supplied to a collector can flow through the interior of this collector, characterised by a second set of at least two transversely spaced substantially tubular collectors and a second set of tubes having a substantially flat cross-section which extends between the second set of collectors and of which the mutually opposed ends are connected to a respective associated collector so that the interior of the tube communicates with the interior of each collector of the second set and a second medium which is supplied to a collector of the second set can flow through the interior of this collector, the interior of the tube of the second set and the interior of the other collector of the second set, and that at least one tube of the first set is in flat heat-exchanging contact with at least one of the tubes of the second set.
2. A heat exchanger according to claim ^ characterised in that each tube of the first set which is in flat heat exchanging contact with at least one tube of the second set, is in flat heat exchanging contact with at least one tube of the other set.
3. A heat exchanger according to claim 1, characterised in that at least part of the heat exchanger comprises is composed of alternating tubes of the first and the second set, each tube being in heat exchanging contact with two tubes of the other set.
4. A heat exchanger according to claim 2, characterised in that the heat exchanger is composed of a number of tubes of the first set, each of said tubes being positioned in flat heat exchanging contact between at least one tube of the second set, and an air gap being provided between each set of at least two tubes.
5. A heat exchanger according to any one of the proceeding claims, characterised in t h a t the first medium and second medium are flowing in counterflow in the tubes which are in heat exchanging contact.
. A heat exchanger according to any one of the preceeding claims, characterised in that each collector of the first type is in heat exchanging contact with one of the collectors of the second type.
7. A heat exchanger according to claim 5, characterised in that each tube of one type extends completely through one collector and communicates with the other collector.
PCT/EP1999/007412 1999-09-29 1999-09-29 Heat exchanger WO2001023823A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP1999/007412 WO2001023823A1 (en) 1999-09-29 1999-09-29 Heat exchanger
AU64686/99A AU6468699A (en) 1999-09-29 1999-09-29 Heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1999/007412 WO2001023823A1 (en) 1999-09-29 1999-09-29 Heat exchanger

Publications (1)

Publication Number Publication Date
WO2001023823A1 true WO2001023823A1 (en) 2001-04-05

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Family Applications (1)

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WO (1) WO2001023823A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004044861A1 (en) * 2004-09-14 2006-03-16 Behr Gmbh & Co. Kg Heat exchangers for motor vehicles
EP1767887A2 (en) * 2005-09-23 2007-03-28 Valeo Klimasysteme GmbH Internal heat exchanger for refrigerant circuit of air conditioning system
DE10313234B4 (en) * 2003-03-17 2010-12-30 Visteon Global Technologies, Inc., Dearborn Heating heat exchanger
JP2013036696A (en) * 2011-08-09 2013-02-21 Daikin Industries Ltd Heat exchanger and freezer unit including the same
DK178817B1 (en) * 2013-01-04 2017-02-20 Lars Østergaard Simple heat exchanger for creamy media that can be pumped

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010817A1 (en) * 1978-11-06 1980-05-14 Akzo N.V. Apparatus for the exchange of heat by means of channels having a small diameter, and the use of this apparatus in different heating systems
JPS6159188A (en) * 1984-08-30 1986-03-26 Toyo Radiator Kk Charge air cooler
JPS61202085A (en) * 1985-03-01 1986-09-06 Showa Alum Corp Heat exchanger
JPH0468297A (en) * 1990-07-09 1992-03-04 Showa Alum Corp Heat exchanger
US5479985A (en) * 1992-03-24 1996-01-02 Nippondenso Co., Ltd. Heat exchanger
EP0781610A2 (en) 1995-12-28 1997-07-02 Showa Aluminum Corporation Process for producing flat heat exchange tubes
WO1998051983A1 (en) 1997-05-12 1998-11-19 Norsk Hydro Asa Heat exchanger
US5875837A (en) * 1998-01-15 1999-03-02 Modine Manufacturing Company Liquid cooled two phase heat exchanger

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010817A1 (en) * 1978-11-06 1980-05-14 Akzo N.V. Apparatus for the exchange of heat by means of channels having a small diameter, and the use of this apparatus in different heating systems
JPS6159188A (en) * 1984-08-30 1986-03-26 Toyo Radiator Kk Charge air cooler
JPS61202085A (en) * 1985-03-01 1986-09-06 Showa Alum Corp Heat exchanger
JPH0468297A (en) * 1990-07-09 1992-03-04 Showa Alum Corp Heat exchanger
US5479985A (en) * 1992-03-24 1996-01-02 Nippondenso Co., Ltd. Heat exchanger
EP0781610A2 (en) 1995-12-28 1997-07-02 Showa Aluminum Corporation Process for producing flat heat exchange tubes
WO1998051983A1 (en) 1997-05-12 1998-11-19 Norsk Hydro Asa Heat exchanger
US5875837A (en) * 1998-01-15 1999-03-02 Modine Manufacturing Company Liquid cooled two phase heat exchanger

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 222 (M - 504) 2 August 1986 (1986-08-02) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 034 (M - 558) 31 January 1987 (1987-01-31) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 274 (M - 1267) 19 June 1992 (1992-06-19) *
STATUS BERICHT DES DEUTSCHEN KOLTE- UND KLIMATECHNISCHEN VEREINS, no. 20, November 1998 (1998-11-01), ISBN NR. 3-9327 1500-4, pages 137

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10313234B4 (en) * 2003-03-17 2010-12-30 Visteon Global Technologies, Inc., Dearborn Heating heat exchanger
DE102004044861A1 (en) * 2004-09-14 2006-03-16 Behr Gmbh & Co. Kg Heat exchangers for motor vehicles
WO2006029720A1 (en) * 2004-09-14 2006-03-23 Behr Gmbh & Co. Kg Heat exchanger for motor vehicles
EP1767887A2 (en) * 2005-09-23 2007-03-28 Valeo Klimasysteme GmbH Internal heat exchanger for refrigerant circuit of air conditioning system
JP2013036696A (en) * 2011-08-09 2013-02-21 Daikin Industries Ltd Heat exchanger and freezer unit including the same
DK178817B1 (en) * 2013-01-04 2017-02-20 Lars Østergaard Simple heat exchanger for creamy media that can be pumped

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