WO2006108431A1 - Heat exchanger comprising an extruded product - Google Patents

Heat exchanger comprising an extruded product Download PDF

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Publication number
WO2006108431A1
WO2006108431A1 PCT/EP2005/003777 EP2005003777W WO2006108431A1 WO 2006108431 A1 WO2006108431 A1 WO 2006108431A1 EP 2005003777 W EP2005003777 W EP 2005003777W WO 2006108431 A1 WO2006108431 A1 WO 2006108431A1
Authority
WO
WIPO (PCT)
Prior art keywords
channels
heat exchanger
fluidum
exchanger according
channel
Prior art date
Application number
PCT/EP2005/003777
Other languages
French (fr)
Inventor
Arvid Espedal
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/EP2005/003777 priority Critical patent/WO2006108431A1/en
Publication of WO2006108431A1 publication Critical patent/WO2006108431A1/en

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
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • 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
    • 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
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators

Definitions

  • Heat exchanger comprising an extruded product
  • the invention relates to a heat exchanger comprising an extruded aluminium or an aluminium alloy product provided with a number of individual and parallel flow channels, comprising a first set of channels for a first flu ⁇ dum and a second set of channels for a second flu ⁇ dum.
  • Such a heat exchanger is generally known, see e.g. WO-A-03 -16812, US-A-5 174 373 and JP-A-61001994.
  • This type of heat exchangers is commonly used for transferring heat between a first fluidum flowing through the channels of the product and air flowing around the product.
  • MPE-tubes are commonly used.
  • two type of channels have been provided because two different fluidums have to be involved in the heat exchanging process. Examples of such application are the use as a condenser and as internal heat exchanger in a carbondioxyde heat exchanger.
  • aluminium cannot be used as this material is not compatible with the fluidum flowing through the channels.
  • tap water which will be contaminated by the aluminium.
  • each channel of at least one set of channels has been provided with an internal lining.
  • Fig.1 is a schematic drawing of a heat exchanger according to the invention.
  • Fig.2 is a schematic cross-section view according to the line M-Il in Fig. 1 ,
  • Fig. 3 is a cross-section view of a heat-exchanging tube which can be used in the heat exchanger shown in Fig. 1 and 2,
  • Fig. 4 is a cross-section view of a modified embodiment of a heat exchanging tube which can be used in the heat exchanger shown in Fig. 1 and 2, and
  • Fig. 5 is a cross-section view of a third embodiment of a heat exchanging tube which can be used in the heat exchanger shown in Fig. 1 and 2.
  • a heat exchanger which essentially consists of a number of extruded products 1 , having a first set of channels 2 and a second set of channels 3, connector elements 13 for the second set of channels 3 and manifolds 6 and 7 interconnecting the first set of channels 2.
  • the extruded product 1 is shown in more detail in Figure 3 in which also the two sets of channels have been shown.
  • the extruded product 1 consists of a central part 10 containing as an example three parallel channels 2 and two end parts 11 each containing one channel 3.
  • the end portions of the channels 3 are interconnected by so-called hairpin connectors 13, which means that each end portion is either connected through such a hairpin connector to a channel 3 of the same extruded product or is connected to a channel 3 of a neighbouring extruded product either to the channel immediately above the channel 3 or to a channel 3 at the opposite end of the neighbouring extruded product.
  • hairpin connectors 13 which means that each end portion is either connected through such a hairpin connector to a channel 3 of the same extruded product or is connected to a channel 3 of a neighbouring extruded product either to the channel immediately above the channel 3 or to a channel 3 at the opposite end of the neighbouring extruded product.
  • the heat exchanger according to the invention can be used for heating tap water to a temperature which is normally used in household application, e.g. a temperature between 40 and 60 0 C.
  • the channels 2 may be connected to a heat exchanging system of the CO2-type, and this through the manifolds 6 and 7.
  • the system formed by the channels is used as the condenser in such a system.
  • the channels 3 which in fact form a single flow system and not a parallel flow system are used for the tap water flow from an inlet to an outlet, and during this transport the water can be heated to the desired temperature.
  • tap water is not compatible with aluminium because the term "tap water” represents a range of qualities depending on very local ground conditions. Tap water may include acidic water, pH ⁇ 6, and small quantities of chlorides and heavy metal salts that may promote pitting corrosion on aluminium.
  • these walls are provided with a lining which is compatible with the normal range of tap water qualities.
  • a lining which is compatible with the normal range of tap water qualities.
  • examples of such materials are copper, plastic materials such as Teflon and the like.
  • a tube of the right diameter is made out of these materials and inserted into the channels 3.
  • these tube ends are somewhat longer than the channels 3 in the extruded product so that the end portions 15 of the inserted tube extend slightly beyond the channels 3 and form connection pieces for the hairpin connectors and/or the inlet and outlet devices for the tap water.
  • After insertion of the lining tubes these can be expanded in the channels 3 in order to obtain a tight connection between the inner wall of the channels and the outer wall of the lining tube.
  • copper is a preferred material as it offers a good heat transfer capability and a good compatibility with tap water.
  • FIG 4 there is shown a modified embodiment of the extruded product 1 shown in Figure 3.
  • the extruded product 20 shown in Figure 4 has a first set of channels 22 which in this embodiment have an elliptical cross-section, and a second set of channels 23 which is identical to the second set of channels 3 in Figure 3.
  • the modification essentially consists of the change of cross-section of the channels 2 and 22.
  • An elliptical shape allows a better heat transfer design then round shape and still able to cope with high pressures as normally used in CO2-transcritical heat pump/refrigeration systems.
  • FIG. 5 there is shown a third embodiment of an extruded product 30.
  • this embodiment there is a central portion 31 having a single channel 33 and two side portions 35, 36 having a number of channels 34.
  • the channel 33 is in this embodiment to be used as the tap water channel and the interconnection between the channels 33 of the different extruded products is obtained by hairpin connectors between the end portions of two channels located in neighbouring extruded products. Otherwise the channels 34 can be connected to manifolds, either to the same manifold at either side or to different manifolds. In the latter situation there are all together four manifolds.
  • channels 23 of Figure 4 and the channel 36 of Figure 5 are also provided with an internal lining such as a copper tube which is press fit into these channels.

Abstract

Heat exchanger comprising an extruded aluminium or an aluminium alloy product (1) provided with a number of individual and parallel flow channels, comprising a first set of channels (2) for a first fluidum and a second set of channels (3) for a second fluidum, where in each channel of at least one set of channels has been provided with an internal lining.

Description

Heat exchanger comprising an extruded product
The invention relates to a heat exchanger comprising an extruded aluminium or an aluminium alloy product provided with a number of individual and parallel flow channels, comprising a first set of channels for a first fluϊdum and a second set of channels for a second fluϊdum.
Such a heat exchanger is generally known, see e.g. WO-A-03 -16812, US-A-5 174 373 and JP-A-61001994.
This type of heat exchangers is commonly used for transferring heat between a first fluidum flowing through the channels of the product and air flowing around the product. For this purpose so-called MPE-tubes are commonly used. In some applications two type of channels have been provided because two different fluidums have to be involved in the heat exchanging process. Examples of such application are the use as a condenser and as internal heat exchanger in a carbondioxyde heat exchanger.
In another application of this type of extruded products it is intended to have a heat exchange between the two fluida flowing through the different sets of channels. In view of the unified construction there is a highly efficient transfer of heat without important losses to the environment. This is especially due to the fact that aluminium is an excellent heat conducting material and the heat transfer between a gas and a solid surface is very low.
In this way is becomes possible to use e.g. heat dissipated in a condenser of an air conditioning system for heating another fluidum.
In a number of applications however aluminium cannot be used as this material is not compatible with the fluidum flowing through the channels. As an example reference can be made to tap water, which will be contaminated by the aluminium.
It is therefore an object of the invention to provide a heat exchanger of the type described in the preamble of the claim which is suitable to be used with any kind of fluidum.
This object is achieved in that each channel of at least one set of channels has been provided with an internal lining.
By providing a lining it is possible to avoid the negative interaction between aluminium and the fluidum flowing through the channel. Moreover it is possible to select the material of the lining in such a way that all reaction between the lining and the fluidum can be avoided.
Other characteristics and advantages of the invention will become clear from the following description, reference being made to the annexed drawings, in which:
Fig.1 is a schematic drawing of a heat exchanger according to the invention,
Fig.2 is a schematic cross-section view according to the line M-Il in Fig. 1 ,
Fig. 3 is a cross-section view of a heat-exchanging tube which can be used in the heat exchanger shown in Fig. 1 and 2,
Fig. 4 is a cross-section view of a modified embodiment of a heat exchanging tube which can be used in the heat exchanger shown in Fig. 1 and 2, and
Fig. 5 is a cross-section view of a third embodiment of a heat exchanging tube which can be used in the heat exchanger shown in Fig. 1 and 2.
In the Figures 1 and 2 there is shown a heat exchanger according to the invention which essentially consists of a number of extruded products 1 , having a first set of channels 2 and a second set of channels 3, connector elements 13 for the second set of channels 3 and manifolds 6 and 7 interconnecting the first set of channels 2.
The extruded product 1 is shown in more detail in Figure 3 in which also the two sets of channels have been shown. The extruded product 1 consists of a central part 10 containing as an example three parallel channels 2 and two end parts 11 each containing one channel 3.
In the heat exchanger of Figures 1 and 2 the end portions of the channels 2 of each extruded product 1 are connected to manifolds 6 and 7 as is normal in so- called parallel flow heat exchangers. A first fluidum is flowing in this way from one manifold 6 to another manifold 7 and reverse if a back and forth flow has been envisaged.
The end portions of the channels 3 are interconnected by so-called hairpin connectors 13, which means that each end portion is either connected through such a hairpin connector to a channel 3 of the same extruded product or is connected to a channel 3 of a neighbouring extruded product either to the channel immediately above the channel 3 or to a channel 3 at the opposite end of the neighbouring extruded product. In this way a flow of medium is obtained which starts in one of the extreme extruded products 1 and leaves the heat exchanger in the other extreme extruded product.
During this transport of fluidum through the channels heat can be exchanged between this fluidum and a fluidum flowing through the channels 2 and the manifolds 6 and 7. In this way a first fluidum can be heated and the other one cooled or reverse.
In practise the heat exchanger according to the invention can be used for heating tap water to a temperature which is normally used in household application, e.g. a temperature between 40 and 60 0C. For that purpose the channels 2 may be connected to a heat exchanging system of the CO2-type, and this through the manifolds 6 and 7. Preferably the system formed by the channels is used as the condenser in such a system. The channels 3 which in fact form a single flow system and not a parallel flow system are used for the tap water flow from an inlet to an outlet, and during this transport the water can be heated to the desired temperature.
As is generally known tap water is not compatible with aluminium because the term "tap water" represents a range of qualities depending on very local ground conditions. Tap water may include acidic water, pH < 6, and small quantities of chlorides and heavy metal salts that may promote pitting corrosion on aluminium.
In order to prevent the direct contact between the tap water and the aluminium wall of the tubes 3, these walls are provided with a lining which is compatible with the normal range of tap water qualities. Examples of such materials are copper, plastic materials such as Teflon and the like. In order to apply this lining, a tube of the right diameter is made out of these materials and inserted into the channels 3. Preferably these tube ends are somewhat longer than the channels 3 in the extruded product so that the end portions 15 of the inserted tube extend slightly beyond the channels 3 and form connection pieces for the hairpin connectors and/or the inlet and outlet devices for the tap water. After insertion of the lining tubes these can be expanded in the channels 3 in order to obtain a tight connection between the inner wall of the channels and the outer wall of the lining tube. In this way a good heat transfer between the inner walls of the channels 3 and the lining tube can be obtained, with only subordinate influence on the total heat transfer between the two fluida flowing through the channels 2 and 3 respectively. In view of this heat transfer requirement copper is a preferred material as it offers a good heat transfer capability and a good compatibility with tap water.
In Figure 4 there is shown a modified embodiment of the extruded product 1 shown in Figure 3. The extruded product 20 shown in Figure 4 has a first set of channels 22 which in this embodiment have an elliptical cross-section, and a second set of channels 23 which is identical to the second set of channels 3 in Figure 3. The modification essentially consists of the change of cross-section of the channels 2 and 22. An elliptical shape allows a better heat transfer design then round shape and still able to cope with high pressures as normally used in CO2-transcritical heat pump/refrigeration systems.
In Figure 5 there is shown a third embodiment of an extruded product 30. In this embodiment there is a central portion 31 having a single channel 33 and two side portions 35, 36 having a number of channels 34.
The channel 33 is in this embodiment to be used as the tap water channel and the interconnection between the channels 33 of the different extruded products is obtained by hairpin connectors between the end portions of two channels located in neighbouring extruded products. Otherwise the channels 34 can be connected to manifolds, either to the same manifold at either side or to different manifolds. In the latter situation there are all together four manifolds.
It is nearly superfluous to say that the channels 23 of Figure 4 and the channel 36 of Figure 5 are also provided with an internal lining such as a copper tube which is press fit into these channels.
It may be obvious that the invention is not restricted to the embodiments shown and described above, but that modifications may be applied within the scope of the claims without leaving the basic idea of the invention.

Claims

Claims
1. Heat exchanger comprising an extruded aluminium or an aluminium alloy product provided with a number of individual and parallel flow channels, comprising a first set of channels for a first fluidum and a second set of channels for a second fluidum, characterised in that each channel of at least one set of channels has been provided with an internal lining.
2. Heat exchanger according to claim 1 , characterised in that one set of channels is located between the other set of channels.
3. Heat exchanger according to claim 1 or 2, characterised in that the first fluidum is water, preferably tap water.
4. Heat exchanger according to anyone of the claims 1-3, characterised in that the second fluidum is carbondioxyde.
5. Heat exchanger according to claim 3, characterised in that the lining consists of copper or a copper alloy.
6. Heat exchanger according to anyone of the claims 1-5, characterised in that a number of extruded products are positioned in parallel to each other and the ends of the first set of channels are connected to manifolds for distributing and collecting the first fluidum over and from the individual channels and in that the end of each channel of the second set is connected to a neighbouring channel end by means of a hairpin connector.
7. Heat exchanger according to claim 6, characterised in that the second set of channels is provided with a lining and in that the hairpin connectors are made of the same material as the lining.
8. Heat exchanger according to claim 6 or 7, characterised in that the heat exchanger is used as a hot water supply system, the water flowing through the second set of channels.
9. Heat exchanger according to claim 8, characterised in that the first fluidum is carbondioxyde and the first set of channels is acting as a condenser in carbondioxyde heat exchanger system (heat pump system).
10. Heat exchanger according to anyone of the preceding claims, characterised in that each lining consists of a tube which has been pressfit into the channel.
PCT/EP2005/003777 2005-04-11 2005-04-11 Heat exchanger comprising an extruded product WO2006108431A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/003777 WO2006108431A1 (en) 2005-04-11 2005-04-11 Heat exchanger comprising an extruded product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/003777 WO2006108431A1 (en) 2005-04-11 2005-04-11 Heat exchanger comprising an extruded product

Publications (1)

Publication Number Publication Date
WO2006108431A1 true WO2006108431A1 (en) 2006-10-19

Family

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Family Applications (1)

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PCT/EP2005/003777 WO2006108431A1 (en) 2005-04-11 2005-04-11 Heat exchanger comprising an extruded product

Country Status (1)

Country Link
WO (1) WO2006108431A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989011067A1 (en) * 1988-05-04 1989-11-16 Cubeair A/S Central heating system with elongated extruded profile members as the heat generating elements, and a method of manufacturing such profile members
US6098704A (en) * 1997-06-06 2000-08-08 Denso Corporation Heat exchanger having a double pipe construction and method for manufacturing the same
JP2001153571A (en) * 1999-09-16 2001-06-08 Denso Corp Heat exchanger
WO2003016812A1 (en) * 2001-08-13 2003-02-27 Norsk Hydro Asa A heat exchanger and a manufacturing method for said heat exchanger
AU768858B2 (en) * 1999-09-07 2004-01-08 Modine Manufacturing Company Combined evaporation/accumulator/suction line heat exchanger
US20040200604A1 (en) * 2002-05-07 2004-10-14 Valeo, Inc Heat exchanger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989011067A1 (en) * 1988-05-04 1989-11-16 Cubeair A/S Central heating system with elongated extruded profile members as the heat generating elements, and a method of manufacturing such profile members
US6098704A (en) * 1997-06-06 2000-08-08 Denso Corporation Heat exchanger having a double pipe construction and method for manufacturing the same
AU768858B2 (en) * 1999-09-07 2004-01-08 Modine Manufacturing Company Combined evaporation/accumulator/suction line heat exchanger
JP2001153571A (en) * 1999-09-16 2001-06-08 Denso Corp Heat exchanger
WO2003016812A1 (en) * 2001-08-13 2003-02-27 Norsk Hydro Asa A heat exchanger and a manufacturing method for said heat exchanger
US20040200604A1 (en) * 2002-05-07 2004-10-14 Valeo, Inc Heat exchanger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 23 10 February 2001 (2001-02-10) *

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