EP2478319A1 - Multi tube heat exchanger - Google Patents

Multi tube heat exchanger

Info

Publication number
EP2478319A1
EP2478319A1 EP10817484A EP10817484A EP2478319A1 EP 2478319 A1 EP2478319 A1 EP 2478319A1 EP 10817484 A EP10817484 A EP 10817484A EP 10817484 A EP10817484 A EP 10817484A EP 2478319 A1 EP2478319 A1 EP 2478319A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
extrusion
ports
heat
systems
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
EP10817484A
Other languages
German (de)
French (fr)
Other versions
EP2478319A4 (en
EP2478319B1 (en
Inventor
Richard Lang JØRGENSEN
Jeffrey L. Insalaco
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.)
Hydro Extruded Solutions AS
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
Publication of EP2478319A1 publication Critical patent/EP2478319A1/en
Publication of EP2478319A4 publication Critical patent/EP2478319A4/en
Application granted granted Critical
Publication of EP2478319B1 publication Critical patent/EP2478319B1/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F28D1/047—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 the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—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 the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • 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
    • F28D1/047—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 the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0472—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 the conduits being bent, e.g. in a serpentine or zig-zag the conduits being helically or spirally coiled
    • 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
    • F28F1/14—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 and extending longitudinally
    • F28F1/22—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 and extending longitudinally the means having portions engaging further tubular elements
    • 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
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/007—Condensers
    • 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
    • F28F1/14—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 and extending longitudinally
    • F28F1/16—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 and extending longitudinally the means being integral with the element, e.g. formed by extrusion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded

Definitions

  • the present invention relates to a heat exchanger for heat exchange or heat recovery in systems such as refrigeration or heat pump systems, in particular a condenser or evaporator in such systems.
  • the steel heat exchanger is commonly manufactured as a two piece construction made of steel tubing and steel sheet material or wire which are bonded to each other by mechanical fastening means or tack welding and then finally shaped to the desired shape (se later description).
  • a heat exchanger of the tube and sheet type is for instance known from US patent No. 7,140,25.
  • the thermal capacity of the steel heat exchanger or condenser is limited by two major factors namely the thermal conductivity and the physical connection (usually tack weld) between the tube and the sheet/wire which reduces the energy transfer and represent a bottleneck for the thermal flow.
  • the manufacturing is relatively expensive due to the number of manufacturing steps.
  • From US 4,852,233 and US 5,729,995 are further known different types of extruded, flat multi port (multi hole) tube heat exchangers of aluminium where the tube is folded into parallel tube loops forming a rectangular heat exchanger "stack" with an inlet at one end and outlet at an other end for the fluid to be circulated.
  • a disadvantage with these known extruded multi tube solutions is the use of end manifold to interconnect the ports at each end which represent an extra cost to manufacture and assemble. Besides, the heat transfer efficiency is reduced due to poor fluid circulation.
  • a heat exchanger in particular a condenser for refrigeration systems, which is simple and cheap to manufacture and which has high thermal efficiency.
  • the invention is characterized by the features as defined in the attached independent claim 1. Preferred embodiments of the invention are further defined in the independent claims 2 - 5.
  • Fig. 1 shows in perspective view part of a commonly known refrigeration system, including a compressor and steel condenser with connecting piping,
  • Fig. 2 shows a perspective view of a tube and sheet element of a conventional steel condenser prior to bending.
  • Fig. 3 shows the same element as in Fig. 2 after bending
  • Fig. 4 shows a perspective view of an extruded multi port (multi channel or hole) element from which the heat exchanger according to the invention is made
  • Fig. 5 shows in much larger scale a cross section of the extruded element shown in Fig. 4,
  • Fig. 6 shows the extruded element bent to its final shape forming a heat exchanger according to the invention.
  • Fig. 1 shows in perspective view part of a commonly known refrigeration system for a drink dispenser or display cooler unit.
  • the figure does not show a complete refrigeration system, but just the compressor 1 and steel condenser 2, as well as some connecting piping for such system.
  • the condenser shown in Fig. 1 is as stated a steel pipe type with wire mesh for improved heat transfer.
  • the steel heat exchanger is manufactured as a two piece construction made of steel tubing and steel wire mesh or sheet metal which is tack welded together.
  • Figs. 2 and 3 shows an example of a known steel heat exchanger or condenser based on steel tubing and steel sheet element where the steel tube 3 is first bent into a serpentine so that the inlet 4 and outlet end 5 are on the same side and where a sheet metal 6 is tack welded together with the tube 3. After the two steel parts 3, 6 are joined the condenser element is spray painted for extra corrosion protection and the condenser is finally formed by bending the tack welded tubing and sheet into a serpentine or square as shown in Fig. 2.
  • Figs. 4 - 6 show the heat exchanger 10 (see in particular Fig 6 - finished product) according to the invention. More precisely Fig. 4 shows the multi-port aluminium extrusion 8 of which the heat exchanger according to the invention is made, and Fig. 5 shows in larger scale a cross section such extrusion. Its initial shape is a longitudinal extruded element or bar 8 formed as a flat "sheet" 11 with interconnected ports or holes/channels 9.
  • the extrusion 8 as shown in Figs 4 and 5 is bent from the middle part and outwards in parallel loops like a serpentine and finally forming a rectangular heat exchanger "package" as shown in Fig. 6.
  • the two ends of the extrusion are bent such that they are facing each other, as is further shown in the Fig. 6, and are connected at an offset of one port or hole 9.
  • This is preferably done by means of small connecting tubes 12 inserted and brazed in between the ports or holes 9 facing each other from each end of extrusion element 8, and thereby creating a single helical loop unit with inlet and outlet ports, 15 respectively 16, preferably provided with pipe connectors 13, 14 braced thereto.
  • the connecting tubes 12 and inlet/outlet connectors 13, 14 may be of any suitable material such as aluminium or copper.
  • the ends of the extrusion may be mechanically processed to remove excess material between the ports 9 of the extrusion thereby using the ports 9 as such as connectors.
  • This heat exchanger according to the invention requires no "return bends" and it offers a rigid construction.
  • the thermal conductivity of aluminum is 250 w/m x k which far superior to steel and the profile is extruded in one piece which offers the best possible heat transfer bridge between the media in side the tube and the air passing the exterior of the profile.
  • the aluminium extrusion solution according to the invention further eliminates several manufacturing process steps such tube serpentine bending, tack welding to sheet/wire and painting.
  • Aluminum is by nature self protecting against corrosion due to its ability to create a self healing oxide layer. Should there be a need for further corrosion protection it is possible for instance to zink arc spray the profile or use a long life alloy such as 300048 or a combination of both.
  • the heat exchanger can be used, not only as condenser in a refrigeration system, but in any system where heat is exchanged or recovered.

Landscapes

  • 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 for heat exchange or heat recovery in systems such as refrigeration or heat pump systems, in particular a condenser or evaporator in such systems The heat exchanger is shaped of a multi-port aluminium extrusion (8) by bending and forming parallel loops. Each of the ends of the extrusion (8) are finally bent such that they are facing each other and are connected at an offset of one port or hole (9) and thereby creating a single helical loop unit with inlet and outlet ports (15 respectively 16).

Description

Multi tube heat exchanger
The present invention relates to a heat exchanger for heat exchange or heat recovery in systems such as refrigeration or heat pump systems, in particular a condenser or evaporator in such systems.
Many soft drink dispensers and display coolers use a steel heat exchanger as the condenser unit in their refrigeration system. The steel heat exchanger is commonly manufactured as a two piece construction made of steel tubing and steel sheet material or wire which are bonded to each other by mechanical fastening means or tack welding and then finally shaped to the desired shape (se later description). A heat exchanger of the tube and sheet type is for instance known from US patent No. 7,140,25.
However, the thermal capacity of the steel heat exchanger or condenser is limited by two major factors namely the thermal conductivity and the physical connection (usually tack weld) between the tube and the sheet/wire which reduces the energy transfer and represent a bottleneck for the thermal flow. Besides, even though the steel material as such is cheap compared to other metals used in heat exchangers, the manufacturing is relatively expensive due to the number of manufacturing steps. From US 4,852,233 and US 5,729,995 are further known different types of extruded, flat multi port (multi hole) tube heat exchangers of aluminium where the tube is folded into parallel tube loops forming a rectangular heat exchanger "stack" with an inlet at one end and outlet at an other end for the fluid to be circulated. A disadvantage with these known extruded multi tube solutions is the use of end manifold to interconnect the ports at each end which represent an extra cost to manufacture and assemble. Besides, the heat transfer efficiency is reduced due to poor fluid circulation.
There are also known heat exchangers and condensers of other metals, in particular, copper, but these have not found any extensive use, partly because of high material and manufacturing costs.
With the present invention is provided a heat exchanger, in particular a condenser for refrigeration systems, which is simple and cheap to manufacture and which has high thermal efficiency. The invention is characterized by the features as defined in the attached independent claim 1. Preferred embodiments of the invention are further defined in the independent claims 2 - 5.
The invention will be further described in detail in the following by means of examples and with reference to the attached drawings, where:
Fig. 1 shows in perspective view part of a commonly known refrigeration system, including a compressor and steel condenser with connecting piping,
Fig. 2 shows a perspective view of a tube and sheet element of a conventional steel condenser prior to bending.
Fig. 3 shows the same element as in Fig. 2 after bending, and
Fig. 4 shows a perspective view of an extruded multi port (multi channel or hole) element from which the heat exchanger according to the invention is made,
Fig. 5 shows in much larger scale a cross section of the extruded element shown in Fig. 4,
Fig. 6 shows the extruded element bent to its final shape forming a heat exchanger according to the invention.
As stated above, Fig. 1 shows in perspective view part of a commonly known refrigeration system for a drink dispenser or display cooler unit. The figure does not show a complete refrigeration system, but just the compressor 1 and steel condenser 2, as well as some connecting piping for such system. The condenser shown in Fig. 1 is as stated a steel pipe type with wire mesh for improved heat transfer. Moreover, the steel heat exchanger is manufactured as a two piece construction made of steel tubing and steel wire mesh or sheet metal which is tack welded together.
Figs. 2 and 3 shows an example of a known steel heat exchanger or condenser based on steel tubing and steel sheet element where the steel tube 3 is first bent into a serpentine so that the inlet 4 and outlet end 5 are on the same side and where a sheet metal 6 is tack welded together with the tube 3. After the two steel parts 3, 6 are joined the condenser element is spray painted for extra corrosion protection and the condenser is finally formed by bending the tack welded tubing and sheet into a serpentine or square as shown in Fig. 2.
The thermal capacity of the steel condenser is, however, as stated above limited by two major factors, namely the thermal conductivity of steel which is 43 w/m k, and the physical connection (tack weld) between the tube and the sheet/wire which represents a bottleneck for the thermal flow. Figs. 4 - 6 show the heat exchanger 10 (see in particular Fig 6 - finished product) according to the invention. More precisely Fig. 4 shows the multi-port aluminium extrusion 8 of which the heat exchanger according to the invention is made, and Fig. 5 shows in larger scale a cross section such extrusion. Its initial shape is a longitudinal extruded element or bar 8 formed as a flat "sheet" 11 with interconnected ports or holes/channels 9.
When producing the heat exchanger 10, the extrusion 8 as shown in Figs 4 and 5 is bent from the middle part and outwards in parallel loops like a serpentine and finally forming a rectangular heat exchanger "package" as shown in Fig. 6. The two ends of the extrusion are bent such that they are facing each other, as is further shown in the Fig. 6, and are connected at an offset of one port or hole 9. This is preferably done by means of small connecting tubes 12 inserted and brazed in between the ports or holes 9 facing each other from each end of extrusion element 8, and thereby creating a single helical loop unit with inlet and outlet ports, 15 respectively 16, preferably provided with pipe connectors 13, 14 braced thereto. The connecting tubes 12 and inlet/outlet connectors 13, 14 may be of any suitable material such as aluminium or copper. Alternatively, instead of separate connectors 12, 13, 14, the ends of the extrusion may be mechanically processed to remove excess material between the ports 9 of the extrusion thereby using the ports 9 as such as connectors. This heat exchanger according to the invention requires no "return bends" and it offers a rigid construction.
Thermal tests on the inventive aluminum condenser has revealed that it has a far better thermal capacity per square unit in comparison to the commonly used steel condensers that is dominating the market today, and the present invention may therefore substitute the condenser solutions made of steel.
The thermal conductivity of aluminum is 250 w/m x k which far superior to steel and the profile is extruded in one piece which offers the best possible heat transfer bridge between the media in side the tube and the air passing the exterior of the profile.
The aluminium extrusion solution according to the invention further eliminates several manufacturing process steps such tube serpentine bending, tack welding to sheet/wire and painting.
Aluminum is by nature self protecting against corrosion due to its ability to create a self healing oxide layer. Should there be a need for further corrosion protection it is possible for instance to zink arc spray the profile or use a long life alloy such as 300048 or a combination of both.
The idea of using an extruded aluminum profile and then offsetting the ends according to the present invention further reduces the overall production process and thereby the production cost significantly.
The invention as defined in the claims is not delimited to the example as described above and shown in the figures. Thus, the heat exchanger can be used, not only as condenser in a refrigeration system, but in any system where heat is exchanged or recovered.

Claims

Claims
Heat exchanger for heat exchange or heat recovery in systems such as refrigeration or heat pump systems, in particular a condenser or evaporator in such systems, the heat exchanger being shaped of a multi-port aluminium extrusion (8) by bending and forming parallel loops,
characterised in that
each of the ends of the extrusion (8) are finally bent such that they are facing each other and are connected at an offset of one port or hole (9) and thereby creating a single helical loop unit with inlet and outlet ports (15 respectively 16), preferably.
Heat exchanger according to claim ,
characterised in that
that the ports (9) are connected by means of small connecting tubes (12) inserted and brazed in between the ports or holes (9) facing each other from each end of extrusion element (8),
Heat exchanger according to claim 1 ,
characterised in that
the inlet and outlet ports (15, 16) each are provided with pipe connectors (13 respectively 14) which are braced thereto
Heat exchanger according to claim 1 ,
characterised in that
the ends of the extrusion (8) is mechanically processed to remove excess material between the ports (9) of the extrusion whereby the ports (9) as such are used as connectors.
5. Heat exchanger according to claims 1 -3,
characterised in that
the connecting tubes (12) and inlet/outlet connectors (13, 14) of a suitable material such as aluminium or copper.
EP10817484.8A 2009-09-18 2010-09-08 Multi tube heat exchanger Withdrawn - After Issue EP2478319B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20093024 2009-09-18
PCT/NO2010/000329 WO2011034436A1 (en) 2009-09-18 2010-09-08 Multi tube heat exchanger

Publications (3)

Publication Number Publication Date
EP2478319A1 true EP2478319A1 (en) 2012-07-25
EP2478319A4 EP2478319A4 (en) 2013-12-04
EP2478319B1 EP2478319B1 (en) 2015-07-15

Family

ID=43758856

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10817484.8A Withdrawn - After Issue EP2478319B1 (en) 2009-09-18 2010-09-08 Multi tube heat exchanger

Country Status (7)

Country Link
US (1) US20120227947A1 (en)
EP (1) EP2478319B1 (en)
CN (1) CN102639955A (en)
BR (1) BR112012005900A2 (en)
IN (1) IN2012DN02287A (en)
MX (1) MX2012003088A (en)
WO (1) WO2011034436A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150126386A (en) * 2013-03-01 2015-11-11 사파 에이에스 Multi port extrusion (mpe) design
WO2014133395A1 (en) * 2013-03-01 2014-09-04 Norsk Hydro Asa Fin solution related to micro channel based heat exchanger
DE202014004155U1 (en) * 2014-05-20 2015-08-25 Bundy Refrigeration International Holding B.V. Circular heat exchanger with molded dryer and refrigeration circuit with this heat exchanger
CN110542330B (en) * 2019-09-02 2021-02-09 枣庄学院 Water-cooled air cooler capable of being connected in multiple ways

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Also Published As

Publication number Publication date
WO2011034436A1 (en) 2011-03-24
US20120227947A1 (en) 2012-09-13
IN2012DN02287A (en) 2015-08-21
EP2478319A4 (en) 2013-12-04
EP2478319B1 (en) 2015-07-15
BR112012005900A2 (en) 2016-03-15
MX2012003088A (en) 2012-06-27
CN102639955A (en) 2012-08-15

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