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US20100326092A1 - Heat exchanger tube having integrated thermoelectric devices - Google Patents

Heat exchanger tube having integrated thermoelectric devices Download PDF

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Publication number
US20100326092A1
US20100326092A1 US12/877,035 US87703510A US2010326092A1 US 20100326092 A1 US20100326092 A1 US 20100326092A1 US 87703510 A US87703510 A US 87703510A US 2010326092 A1 US2010326092 A1 US 2010326092A1
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United States
Prior art keywords
heat exchanger
thermoelectric devices
tubes
fluid
heat transfer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/877,035
Inventor
Lakhi Nandlal Goenka
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Gentherm Inc
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Individual
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Publication date
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Priority to US12/877,035 priority Critical patent/US20100326092A1/en
Publication of US20100326092A1 publication Critical patent/US20100326092A1/en
Assigned to BANK OF AMERICA, N.A. reassignment BANK OF AMERICA, N.A. SECURITY AGREEMENT Assignors: AMERIGON INCORPORATED, BSST LLC, ZT PLUS, LLC
Assigned to Gentherm Incorporated reassignment Gentherm Incorporated ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BSST LLC
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B21/00—Machines, plants or systems, using electric or magnetic effects
    • F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00321—Heat exchangers for air-conditioning devices
    • B60H1/00328—Heat exchangers for air-conditioning devices of the liquid-air type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00478—Air-conditioning devices using the Peltier effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
    • B60H1/00557—Details of ducts or cables
    • 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
    • F28D1/053—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 straight
    • F28D1/05316—Assemblies of conduits connected to common headers, e.g. core type radiators
    • 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
    • F28D7/16—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 being arranged in parallel spaced relation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/16—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying an electrostatic field to the body of the heat-exchange medium
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/10—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects
    • H10N10/13—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects characterised by the heat-exchanging means at the junction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means

Definitions

  • the present invention relates to a heat exchanger tube and more particularly to a heat exchanger tube having integrated thermoelectric devices to increase a thermal efficiency of the heat exchanger.
  • An air-cooled fin-type heat exchanger is very well known. Heat exchangers are used for changing the temperature of various working fluids, such as an engine coolant, an engine lubricating oil, an air conditioning refrigerant, and an automatic transmission fluid, for example.
  • the heat exchanger typically includes a plurality of spaced apart fluid conduits or tubes connected between an inlet tank and an outlet tank, and a plurality of heat exchanging fins disposed between adjacent conduits. Air is directed across the fins of the heat exchanger by a cooling fan or a motion of a vehicle, for example. As the air flows across the fins, heat in a fluid flowing through the tubes is conducted through the walls of the tubes, into the fins, and transferred into the air.
  • Thermal efficiency is measured by dividing the amount of heat that is transferred by the heat exchanger under a given set of conditions (amount of airflow, temperature difference between the air and fluid, and the like) by the theoretical maximum possible heat transfer under those conditions. Thus, an increase in the rate of heat transfer under a given set of conditions results in a higher thermal efficiency.
  • the airflow must be improved and/or a pressure drop through the heat exchanger must be reduced.
  • Improved heat exchanger performance can be accomplished by forming the fins and/or louvers on the fins at a predetermined angle in a manner also well known in the art. Pressure drop is associated with the change in airflow direction caused by the louvered fins. A higher air pressure drop can result in a lower heat transfer rate.
  • Various types of fin and louver designs have been disclosed in the prior art with the object of increasing the heat exchanger efficiency by making improvements in the fins, louvers, and airflow pattern.
  • Examples of these prior art fin and louver designs include an addition of fin rows in order to increase the amount of air encountered by the heat exchanger.
  • Other designs include louvers formed at an angle to the fin wall, rather than square to the fin wall.
  • the prior art discloses heat exchangers with multiple changes of airflow direction. Air flows through the louvers until a middle transition piece or turnaround rib is reached. The air then changes direction and flows through exit louvers to exit the heat exchanger. Fin design continues to play an important role in increasing heat exchanger efficiency.
  • thermoelectric device can be used to transfer heat between fluids, such as from air flow to a fluid in a fluid conduit, for example.
  • the thermoelectric device includes a hot side and a cold side, wherein one of the hot side and the cold side is in communication with each of the fluids.
  • a heat transfer efficiency of the thermoelectric device decreases as a difference in temperature between the hot side and the cold side thereof increases.
  • a tube for a heat exchanger comprises a hollow conduit having a wall, a first end, and a spaced apart second end; and a thermoelectric device in thermal communication with the wall of the conduit to facilitate heat transfer between a first fluid in the conduit and a second fluid outside of the conduit.
  • a heat exchanger comprises at least one heat exchanger tank; a hollow tube having a wall, a first end, and a spaced apart second end, the tube in fluid communication with the at least one heat exchanger tank; a thermoelectric device in thermal communication with the wall of the tube; and a heat exchanger fin in thermal communication with the thermoelectric device.
  • a heat exchanger comprises at least one heat exchanger tank; a plurality of hollow tubes, each tube having a wall, a first end, and a spaced apart second end, the tubes in fluid communication with the at least one heat exchanger tank and adapted to convey a first fluid; a plurality of heat exchanger fins disposed adjacent the tubes and in thermal communication with a second fluid; and a plurality of thermoelectric devices, at least one thermoelectric device disposed between the tubes and the fins to facilitate heat transfer therebetween.
  • FIG. 1 is an end sectional view of a tube for a heat exchanger in accordance with an embodiment of the invention
  • FIG. 2 is an end sectional view a heat exchanger using the tube of FIG. 1 ;
  • FIG. 3 is a side sectional view of a tube for a heat exchanger in accordance with another embodiment of the invention.
  • FIG. 4 is a front sectional view of a heat exchanger in accordance with another embodiment of the invention.
  • FIG. 1 shows a cylindrical tube 10 for a heat exchanger 40 illustrated in FIG. 2 .
  • the tube 10 has an outer wall 12 with a substantially circular cross-sectional shape. Other cross-sectional shapes can be used as desired.
  • the wall 12 is preferably formed from copper or steel; however, other materials may be used to form the wall 12 without departing from the scope and spirit of the invention.
  • the wall 12 forms a hollow interior portion 14 .
  • thermoelectric device (TED) 16 surrounds and is in thermal communication with the wall 12 .
  • the TED 16 includes a first heat transfer surface 18 and a second heat transfer surface 20 .
  • the first heat transfer surface 18 is in thermal communication with the wall 12 .
  • the second heat transfer surface 20 is in thermal communication with a plurality of fins 22 surrounding the TED 16 .
  • the TED 16 is in electrical communication with a control system (not shown).
  • the control system controls an electric current sent to the TED 16 .
  • a current is delivered in one direction
  • one of the first heat transfer surface 18 and the second heat transfer surface 20 generates thermal energy and the other of the first heat transfer surface 18 and the second heat transfer surface 20 absorbs thermal energy.
  • the current is reversed, the one of the first heat transfer surface 18 and the second heat transfer surface 20 which was generating thermal energy now absorbs thermal energy, and the other of the first heat transfer surface 18 and the second heat transfer surface 20 now generates thermal energy.
  • the current is increased, a heating and cooling capacity of the TED 16 is increased.
  • the heating and cooling capacity of the TED 16 is decreased.
  • the TED 16 may be any conventional device such as: those produced by Marlow Industries, Inc. of Dallas, Tex.; the thermoelectric systems described in U.S. Pat. No. 6,539,725 to Bell; a quantum tunneling converter; a Peltier device; a thermo ionic module; a magneto caloric module; an acoustic heating mechanism; a solid state heat pumping device; and the like; for example; or any combination of the devices listed above. Although a single thermoelectric device is shown, it is understood that additional thermoelectric devices can be used, as desired.
  • a first fluid (not shown) is caused to flow through the hollow interior portion 14 of the tube 10 .
  • the first fluid can be any conventional fluid such as air or a coolant such as a water-glycol coolant, for example.
  • the first fluid contains thermal energy which is transferred to the wall 12 .
  • Current is supplied to the TED 16 , which causes the first heat transfer surface 18 of the TED 16 to absorb thermal energy from the wall 12 .
  • the second heat transfer surface 20 of the TED 16 generates thermal energy.
  • the thermal energy generated by the second heat transfer surface 20 of the TED 16 is transferred to the fins 22 .
  • a second fluid (not shown) is caused to flow across and contact the fins 22 .
  • the second fluid can be any conventional fluid such as air, for example.
  • the thermal energy transferred from the second heat transfer surface 20 of the TED 16 to the fins 22 is transferred to the second fluid.
  • FIG. 3 shows a tube 60 for a heat exchanger (not shown) having a first wall 62 , a second wall 64 , a fluid inlet 66 , and a fluid outlet 68 .
  • the tube 60 shown is a flat tube for use in a flat tube heat exchanger.
  • tubes having other shapes and for use in other types of heat exchangers, such as cross flow heat exchangers, shell and tube heat exchangers, or counter flow heat exchangers, for example, can be used as desired without departing from the scope and spirit of the invention.
  • the walls 62 , 64 are preferably formed from copper or steel. However, other materials may be used to form the walls 62 , 64 as desired.
  • the first wall 62 , the second wall 64 , and a pair of side walls cooperate to form a hollow interior portion 70 .
  • a first thermoelectric device (TED) 72 is disposed adjacent to and is in thermal communication with the first wall 62 .
  • the first TED 72 includes a first heat transfer surface 74 and a second heat transfer surface 76 .
  • the first heat transfer surface 74 is in thermal communication with the first wall 62 .
  • the second heat transfer surface 76 is in thermal communication with a plurality of fins 78 disposed adjacent to the first TED 72 .
  • a second thermoelectric device (TED) 80 is disposed adjacent to and is in thermal communication with the second wall 64 .
  • the second TED 80 includes a first heat transfer surface 82 and a second heat transfer surface 84 .
  • the first heat transfer surface 82 is in thermal communication with the second wall 64 .
  • the second heat transfer surface 84 is in thermal communication with a plurality of fins 86 disposed adjacent to the second TED 80 .
  • the TEDs 72 , 80 may be any conventional devices such as: those produced by Marlow Industries, Inc. of Dallas, Tex.; the thermoelectric systems described in U.S. Pat. No. 6,539,725 to Bell; a quantum tunneling converter; a Peltier device; a thermo ionic module; a magneto caloric module; an acoustic heating mechanism; a solid state heat pumping device; and the like; for example; or any combination of the devices listed above. Although two thermoelectric devices are shown, it is understood that a single or additional thermoelectric devices can be used, as desired. Further, it is understood that the side walls of the tube 60 may include additional TEDs if desired. If the side walls of the tube include additional TEDs, a plurality of fins can be disposed adjacent the TEDs as desired.
  • the first TED 72 and the second TED 80 are in electrical communication with a control system (not shown).
  • the control system controls an electric current sent to the TEDs 72 , 80 .
  • a current is delivered in one direction
  • one of the first heat transfer surfaces 74 , 82 and the second heat transfer surfaces 76 , 84 generates thermal energy and the other of the first heat transfer surfaces 74 , 82 and the second heat transfer surfaces 76 , 84 absorbs thermal energy.
  • the current is reversed, the one of the first heat transfer surfaces 74 , 82 and the second heat transfer surfaces 76 , 84 which was generating thermal energy now absorbs thermal energy, and the other of the first heat transfer surfaces 74 , 82 and the second heat transfer surfaces 76 , 84 now generates thermal energy.
  • the current is increased, a heating and cooling capacity of the TEDs 72 , 80 is increased.
  • the heating and cooling capacity of the TEDs 72 , 80 is decreased.
  • a first fluid (not shown) is caused to flow through the hollow interior portion 70 of the tube 60 .
  • the first fluid can be any conventional fluid such as air or a coolant such as a water-glycol coolant, for example.
  • the first fluid contains thermal energy which is transferred to the first wall 62 and the second wall 64 .
  • Current is supplied to the TEDs 72 , 80 , which causes the first heat transfer surfaces 74 , 82 of the TEDs 72 , 80 to absorb thermal energy from the first wall 62 and the second wall 64 .
  • the second heat transfer surfaces 76 , 84 of the TEDs 72 , 80 generate thermal energy.
  • the thermal energy generated by the second heat transfer surfaces 76 , 84 of the TEDs 72 , 80 is transferred to the fins 78 , 86 .
  • a second fluid (not shown) is caused to flow across and contact the fins 78 , 86 .
  • the second fluid can be any conventional fluid such as air, for example.
  • the thermal energy transferred from the second heat transfer surfaces 76 , 84 of the TEDs 72 , 80 to the fins 78 , 86 is transferred to the second fluid.
  • FIG. 4 shows a heat exchanger 100 in accordance with another embodiment of the invention.
  • the heat exchanger 100 includes a first header 102 and a spaced apart second header 104 .
  • a plurality of cylindrical tubes 106 are disposed between the first header 102 and the second header 104 .
  • the tubes have walls 108 with a substantially circular cross-sectional shape. Other cross-sectional shapes can be used as desired.
  • the walls 108 are preferably formed from copper or steel. However, other materials may be used to form the walls 108 without departing from the scope and spirit of the invention.
  • the walls 108 form hollow interior portions 110 and include a fluid inlet 107 and a fluid outlet 109 .
  • thermoelectric device (TED) 112 surrounds and is in thermal communication with each of the walls 108 .
  • Each TED 112 includes a first heat transfer surface 114 and a second heat transfer surface 116 .
  • the first heat transfer surface 114 is in thermal communication with the wall 108 of the corresponding tube 106 .
  • the second heat transfer surface 116 is in thermal communication with a plurality of fins 120 disposed between each adjacent tube 106 .
  • Each TED 112 is in electrical communication with a control system (not shown).
  • the control system controls an electric current sent to the TED 112 .
  • a current is delivered in one direction, one of the first heat transfer surface 114 and the second heat transfer surface 116 generates thermal energy and the other of the first heat transfer surface 114 and the second heat transfer surface 116 absorbs thermal energy.
  • the current is reversed, the one of the first heat transfer surface 114 and the second heat transfer surface 116 which was generating thermal energy now absorbs thermal energy and the other of the first heat transfer surface 114 and the second heat transfer surface 116 now generates thermal energy.
  • the current is increased, a heating and cooling capacity of the TED 112 is increased.
  • the heating and cooling capacity of the TED 112 is decreased.
  • the TEDs 112 may be any conventional devices such as: those produced by Marlow Industries, Inc. of Dallas, Tex.; the thermoelectric systems described in U.S. Pat. No. 6,539,725 to Bell; a quantum tunneling converter; a Peltier device; a thermo ionic module; a magneto caloric module; an acoustic heating mechanism; a solid state heat pumping device; and the like; for example; or any combination of the devices listed above. Although a single thermoelectric device is shown disposed adjacent each of the tubes 106 , it is understood that additional thermoelectric devices can be used, as desired.
  • a first fluid (not shown) is caused to flow from the second header 104 through the fluid inlets 107 into the hollow interior portions 110 of the tubes 106 .
  • the first fluid can be any conventional fluid such as air or a coolant such as a water-glycol coolant, for example.
  • the first fluid contains thermal energy which is transferred to the walls 108 .
  • Current is supplied to each TED 112 , which causes the first heat transfer surface 114 of each TED 112 to absorb thermal energy from the wall 108 of the corresponding tube 106 .
  • the second heat transfer surface 116 of each TED 112 generates thermal energy.
  • the thermal energy generated by the second heat transfer surface 116 of each TED 112 is transferred to the fins 120 .
  • a second fluid (not shown) is caused to flow across and contact the fins 120 .
  • the second fluid can be any conventional fluid such as air, for example.
  • the thermal energy transferred from the second heat transfer surface 116 of each TED 112 to the fins 120 is transferred to the second fluid.
  • the first fluid flows out of the fluid outlets 109 and into the first header 102 .

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

Abstract

A heat exchanger for a vehicle is shown, wherein the heat exchanger includes a plurality of tubes having integrated thermoelectric devices disposed thereon to facilitate heat transfer between the tubes and an atmosphere surrounding the tubes.

Description

    RELATED APPLICATIONS
  • This application is a continuation of U.S. application Ser. No. 11/497,695, filed Aug. 2, 2006, titled HEAT EXCHANGER TUBE HAVING INTEGRATED THERMOELECTRIC DEVICES, the entire contents of which are incorporated by reference herein and made a part of this specification.
    • BACKGROUND
  • 1. Field
  • The present invention relates to a heat exchanger tube and more particularly to a heat exchanger tube having integrated thermoelectric devices to increase a thermal efficiency of the heat exchanger.
  • 2. Description of Related Art
  • An air-cooled fin-type heat exchanger is very well known. Heat exchangers are used for changing the temperature of various working fluids, such as an engine coolant, an engine lubricating oil, an air conditioning refrigerant, and an automatic transmission fluid, for example. The heat exchanger typically includes a plurality of spaced apart fluid conduits or tubes connected between an inlet tank and an outlet tank, and a plurality of heat exchanging fins disposed between adjacent conduits. Air is directed across the fins of the heat exchanger by a cooling fan or a motion of a vehicle, for example. As the air flows across the fins, heat in a fluid flowing through the tubes is conducted through the walls of the tubes, into the fins, and transferred into the air.
  • One of the primary goals in heat exchanger design is to achieve the highest possible thermal efficiency. Thermal efficiency is measured by dividing the amount of heat that is transferred by the heat exchanger under a given set of conditions (amount of airflow, temperature difference between the air and fluid, and the like) by the theoretical maximum possible heat transfer under those conditions. Thus, an increase in the rate of heat transfer under a given set of conditions results in a higher thermal efficiency.
  • Typically, to improve thermal efficiency, the airflow must be improved and/or a pressure drop through the heat exchanger must be reduced. Improved heat exchanger performance can be accomplished by forming the fins and/or louvers on the fins at a predetermined angle in a manner also well known in the art. Pressure drop is associated with the change in airflow direction caused by the louvered fins. A higher air pressure drop can result in a lower heat transfer rate. Various types of fin and louver designs have been disclosed in the prior art with the object of increasing the heat exchanger efficiency by making improvements in the fins, louvers, and airflow pattern.
  • Examples of these prior art fin and louver designs include an addition of fin rows in order to increase the amount of air encountered by the heat exchanger. Other designs include louvers formed at an angle to the fin wall, rather than square to the fin wall. Further, the prior art discloses heat exchangers with multiple changes of airflow direction. Air flows through the louvers until a middle transition piece or turnaround rib is reached. The air then changes direction and flows through exit louvers to exit the heat exchanger. Fin design continues to play an important role in increasing heat exchanger efficiency.
  • A thermoelectric device can be used to transfer heat between fluids, such as from air flow to a fluid in a fluid conduit, for example. The thermoelectric device includes a hot side and a cold side, wherein one of the hot side and the cold side is in communication with each of the fluids. A heat transfer efficiency of the thermoelectric device decreases as a difference in temperature between the hot side and the cold side thereof increases.
  • It would be desirable to produce a tube for a heat exchanger having an integrated thermoelectric device whereby a thermal efficiency of the heat exchanger is maximized.
    • SUMMARY
  • Harmonious with the present invention, a tube for a heat exchanger having an integrated thermoelectric device whereby a thermal efficiency of the heat exchanger is maximized has surprisingly been discovered.
  • In one embodiment, a tube for a heat exchanger comprises a hollow conduit having a wall, a first end, and a spaced apart second end; and a thermoelectric device in thermal communication with the wall of the conduit to facilitate heat transfer between a first fluid in the conduit and a second fluid outside of the conduit.
  • In another embodiment, a heat exchanger comprises at least one heat exchanger tank; a hollow tube having a wall, a first end, and a spaced apart second end, the tube in fluid communication with the at least one heat exchanger tank; a thermoelectric device in thermal communication with the wall of the tube; and a heat exchanger fin in thermal communication with the thermoelectric device.
  • In another embodiment, a heat exchanger comprises at least one heat exchanger tank; a plurality of hollow tubes, each tube having a wall, a first end, and a spaced apart second end, the tubes in fluid communication with the at least one heat exchanger tank and adapted to convey a first fluid; a plurality of heat exchanger fins disposed adjacent the tubes and in thermal communication with a second fluid; and a plurality of thermoelectric devices, at least one thermoelectric device disposed between the tubes and the fins to facilitate heat transfer therebetween.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The above, as well as other objects and advantages of the invention, will become readily apparent to those skilled in the art from reading the following detailed description of a preferred embodiment of the invention when considered in the light of the accompanying drawings in which:
  • FIG. 1 is an end sectional view of a tube for a heat exchanger in accordance with an embodiment of the invention;
  • FIG. 2 is an end sectional view a heat exchanger using the tube of FIG. 1;
  • FIG. 3 is a side sectional view of a tube for a heat exchanger in accordance with another embodiment of the invention; and
  • FIG. 4 is a front sectional view of a heat exchanger in accordance with another embodiment of the invention.
    •  DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
  • The following detailed description and appended drawings describe and illustrate various exemplary embodiments of the invention. The description and drawings serve to enable one skilled in the art to make and use the invention, and are not intended to limit the scope of the invention in any manner.
  • FIG. 1 shows a cylindrical tube 10 for a heat exchanger 40 illustrated in FIG. 2. The tube 10 has an outer wall 12 with a substantially circular cross-sectional shape. Other cross-sectional shapes can be used as desired. The wall 12 is preferably formed from copper or steel; however, other materials may be used to form the wall 12 without departing from the scope and spirit of the invention. The wall 12 forms a hollow interior portion 14.
  • A thermoelectric device (TED) 16 surrounds and is in thermal communication with the wall 12. The TED 16 includes a first heat transfer surface 18 and a second heat transfer surface 20. The first heat transfer surface 18 is in thermal communication with the wall 12. The second heat transfer surface 20 is in thermal communication with a plurality of fins 22 surrounding the TED 16.
  • The TED 16 is in electrical communication with a control system (not shown). The control system controls an electric current sent to the TED 16. When a current is delivered in one direction, one of the first heat transfer surface 18 and the second heat transfer surface 20 generates thermal energy and the other of the first heat transfer surface 18 and the second heat transfer surface 20 absorbs thermal energy. When the current is reversed, the one of the first heat transfer surface 18 and the second heat transfer surface 20 which was generating thermal energy now absorbs thermal energy, and the other of the first heat transfer surface 18 and the second heat transfer surface 20 now generates thermal energy. When the current is increased, a heating and cooling capacity of the TED 16 is increased. Likewise, when the current is decreased, the heating and cooling capacity of the TED 16 is decreased.
  • The TED 16 may be any conventional device such as: those produced by Marlow Industries, Inc. of Dallas, Tex.; the thermoelectric systems described in U.S. Pat. No. 6,539,725 to Bell; a quantum tunneling converter; a Peltier device; a thermo ionic module; a magneto caloric module; an acoustic heating mechanism; a solid state heat pumping device; and the like; for example; or any combination of the devices listed above. Although a single thermoelectric device is shown, it is understood that additional thermoelectric devices can be used, as desired.
  • In use, a first fluid (not shown) is caused to flow through the hollow interior portion 14 of the tube 10. The first fluid can be any conventional fluid such as air or a coolant such as a water-glycol coolant, for example. The first fluid contains thermal energy which is transferred to the wall 12. Current is supplied to the TED 16, which causes the first heat transfer surface 18 of the TED 16 to absorb thermal energy from the wall 12. Simultaneously, the second heat transfer surface 20 of the TED 16 generates thermal energy. The thermal energy generated by the second heat transfer surface 20 of the TED 16 is transferred to the fins 22. A second fluid (not shown) is caused to flow across and contact the fins 22. The second fluid can be any conventional fluid such as air, for example. The thermal energy transferred from the second heat transfer surface 20 of the TED 16 to the fins 22 is transferred to the second fluid.
  • FIG. 3 shows a tube 60 for a heat exchanger (not shown) having a first wall 62, a second wall 64, a fluid inlet 66, and a fluid outlet 68. The tube 60 shown is a flat tube for use in a flat tube heat exchanger. However, tubes having other shapes and for use in other types of heat exchangers, such as cross flow heat exchangers, shell and tube heat exchangers, or counter flow heat exchangers, for example, can be used as desired without departing from the scope and spirit of the invention. The walls 62, 64 are preferably formed from copper or steel. However, other materials may be used to form the walls 62, 64 as desired. The first wall 62, the second wall 64, and a pair of side walls (not shown) cooperate to form a hollow interior portion 70.
  • A first thermoelectric device (TED) 72 is disposed adjacent to and is in thermal communication with the first wall 62. The first TED 72 includes a first heat transfer surface 74 and a second heat transfer surface 76. The first heat transfer surface 74 is in thermal communication with the first wall 62. The second heat transfer surface 76 is in thermal communication with a plurality of fins 78 disposed adjacent to the first TED 72.
  • A second thermoelectric device (TED) 80 is disposed adjacent to and is in thermal communication with the second wall 64. The second TED 80 includes a first heat transfer surface 82 and a second heat transfer surface 84. The first heat transfer surface 82 is in thermal communication with the second wall 64. The second heat transfer surface 84 is in thermal communication with a plurality of fins 86 disposed adjacent to the second TED 80.
  • The TEDs 72, 80 may be any conventional devices such as: those produced by Marlow Industries, Inc. of Dallas, Tex.; the thermoelectric systems described in U.S. Pat. No. 6,539,725 to Bell; a quantum tunneling converter; a Peltier device; a thermo ionic module; a magneto caloric module; an acoustic heating mechanism; a solid state heat pumping device; and the like; for example; or any combination of the devices listed above. Although two thermoelectric devices are shown, it is understood that a single or additional thermoelectric devices can be used, as desired. Further, it is understood that the side walls of the tube 60 may include additional TEDs if desired. If the side walls of the tube include additional TEDs, a plurality of fins can be disposed adjacent the TEDs as desired.
  • The first TED 72 and the second TED 80 are in electrical communication with a control system (not shown). The control system controls an electric current sent to the TEDs 72, 80. When a current is delivered in one direction, one of the first heat transfer surfaces 74, 82 and the second heat transfer surfaces 76, 84 generates thermal energy and the other of the first heat transfer surfaces 74, 82 and the second heat transfer surfaces 76, 84 absorbs thermal energy. When the current is reversed, the one of the first heat transfer surfaces 74, 82 and the second heat transfer surfaces 76, 84 which was generating thermal energy now absorbs thermal energy, and the other of the first heat transfer surfaces 74, 82 and the second heat transfer surfaces 76, 84 now generates thermal energy. When the current is increased, a heating and cooling capacity of the TEDs 72, 80 is increased. Likewise, when the current is decreased, the heating and cooling capacity of the TEDs 72, 80 is decreased.
  • In use, a first fluid (not shown) is caused to flow through the hollow interior portion 70 of the tube 60. The first fluid can be any conventional fluid such as air or a coolant such as a water-glycol coolant, for example. The first fluid contains thermal energy which is transferred to the first wall 62 and the second wall 64. Current is supplied to the TEDs 72, 80, which causes the first heat transfer surfaces 74, 82 of the TEDs 72, 80 to absorb thermal energy from the first wall 62 and the second wall 64. Simultaneously, the second heat transfer surfaces 76, 84 of the TEDs 72, 80 generate thermal energy. The thermal energy generated by the second heat transfer surfaces 76, 84 of the TEDs 72, 80 is transferred to the fins 78, 86. A second fluid (not shown) is caused to flow across and contact the fins 78, 86. The second fluid can be any conventional fluid such as air, for example. The thermal energy transferred from the second heat transfer surfaces 76, 84 of the TEDs 72, 80 to the fins 78, 86 is transferred to the second fluid.
  • FIG. 4 shows a heat exchanger 100 in accordance with another embodiment of the invention. The heat exchanger 100 includes a first header 102 and a spaced apart second header 104. A plurality of cylindrical tubes 106 are disposed between the first header 102 and the second header 104. The tubes have walls 108 with a substantially circular cross-sectional shape. Other cross-sectional shapes can be used as desired. The walls 108 are preferably formed from copper or steel. However, other materials may be used to form the walls 108 without departing from the scope and spirit of the invention. The walls 108 form hollow interior portions 110 and include a fluid inlet 107 and a fluid outlet 109.
  • A thermoelectric device (TED) 112 surrounds and is in thermal communication with each of the walls 108. Each TED 112 includes a first heat transfer surface 114 and a second heat transfer surface 116. The first heat transfer surface 114 is in thermal communication with the wall 108 of the corresponding tube 106. The second heat transfer surface 116 is in thermal communication with a plurality of fins 120 disposed between each adjacent tube 106.
  • Each TED 112 is in electrical communication with a control system (not shown). The control system controls an electric current sent to the TED 112. When a current is delivered in one direction, one of the first heat transfer surface 114 and the second heat transfer surface 116 generates thermal energy and the other of the first heat transfer surface 114 and the second heat transfer surface 116 absorbs thermal energy. When the current is reversed, the one of the first heat transfer surface 114 and the second heat transfer surface 116 which was generating thermal energy now absorbs thermal energy and the other of the first heat transfer surface 114 and the second heat transfer surface 116 now generates thermal energy. Additionally, when the current is increased, a heating and cooling capacity of the TED 112 is increased. Likewise, when the current is decreased, the heating and cooling capacity of the TED 112 is decreased.
  • The TEDs 112 may be any conventional devices such as: those produced by Marlow Industries, Inc. of Dallas, Tex.; the thermoelectric systems described in U.S. Pat. No. 6,539,725 to Bell; a quantum tunneling converter; a Peltier device; a thermo ionic module; a magneto caloric module; an acoustic heating mechanism; a solid state heat pumping device; and the like; for example; or any combination of the devices listed above. Although a single thermoelectric device is shown disposed adjacent each of the tubes 106, it is understood that additional thermoelectric devices can be used, as desired.
  • In use, a first fluid (not shown) is caused to flow from the second header 104 through the fluid inlets 107 into the hollow interior portions 110 of the tubes 106. The first fluid can be any conventional fluid such as air or a coolant such as a water-glycol coolant, for example. The first fluid contains thermal energy which is transferred to the walls 108. Current is supplied to each TED 112, which causes the first heat transfer surface 114 of each TED 112 to absorb thermal energy from the wall 108 of the corresponding tube 106. Simultaneously, the second heat transfer surface 116 of each TED 112 generates thermal energy. The thermal energy generated by the second heat transfer surface 116 of each TED 112 is transferred to the fins 120. A second fluid (not shown) is caused to flow across and contact the fins 120. The second fluid can be any conventional fluid such as air, for example. The thermal energy transferred from the second heat transfer surface 116 of each TED 112 to the fins 120 is transferred to the second fluid. The first fluid flows out of the fluid outlets 109 and into the first header 102.
  • From the foregoing description, one ordinarily skilled in the art can easily ascertain the essential characteristics of this invention and, without departing from the spirit and scope thereof, can make various changes and modifications to the invention to adapt it to various usages and conditions.

Claims (20)

1. A heat exchanger comprising:
at least one fluid channel;
a plurality of hollow tubes, each of the plurality of tubes having a wall, a first end, and a spaced apart second end, wherein a hollow interior portion of each of the plurality of tubes is in fluid communication with the at least one fluid channel;
a plurality of thermoelectric devices, each of the plurality of thermoelectric devices comprising a first heat transfer surface and a second heat transfer surface, wherein the first heat transfer surface of each of the plurality of thermoelectric devices is in thermal communication with at least a portion of the wall of at least one of the plurality of tubes; and
a plurality of heat exchanger fins, each of the plurality of heat exchanger fins in thermal communication with the second heat transfer surface of at least one of the plurality of thermoelectric devices, wherein the plurality of heat exchanger fins are configured to substantially increase a surface area of thermal communication between the plurality of thermoelectric devices and a working fluid flowing outside the plurality of hollow tubes beyond the surface area of thermal communication of the heat exchanger without the plurality of heat exchanger fins.
2. The heat exchanger of claim 1, further comprising a control system in electrical communication with the plurality of thermoelectric devices, the control system configured to control a direction of electric current delivered to the plurality of thermoelectric devices.
3. The heat exchanger of claim 2, wherein the control system is configured to control a variable electric current delivered to the plurality of thermoelectric devices.
4. The heat exchanger of claim 1, wherein at least one of the plurality of thermoelectric devices is disposed around the wall of at least one of the tubes.
5. The heat exchanger of claim 1, wherein the hollow interior portion of the plurality of tubes is configured to convey a first fluid, and the heat exchanger is configured to convey a second fluid outside the plurality of tubes.
6. The heat exchanger of claim 5, wherein the first fluid is a liquid, and the second fluid is a gas.
7. The heat exchanger of claim 1, wherein the heat exchanger is a flat tube heat exchanger.
8. The heat exchanger of claim 1, wherein the heat exchanger is a cross flow heat exchanger.
9. The heat exchanger of claim 1, wherein the heat exchanger is a shell and tube heat exchanger.
10. The heat exchanger of claim 1, wherein the heat exchanger is a counter flow heat exchanger.
11. The heat exchanger of claim 1, wherein the control system is configured to control the direction of the electric current delivered to the plurality of thermoelectric devices in order to select between a first mode, in which thermal energy is transferred from the wall to the plurality of heat exchanger fins, and a second mode, in which thermal energy is transferred from the plurality of heat exchanger fins to the wall.
12. A method of manufacturing a heat exchanger, the method comprising:
providing a plurality of hollow tubes, each of the plurality of tubes having a wall, a first end, and a spaced apart second end, wherein a hollow interior portion of each of the plurality of tubes is in fluid communication with the at least one fluid channel;
providing a plurality of thermoelectric devices, each of the plurality of thermoelectric devices comprising a first heat transfer surface and a second heat transfer surface;
placing the first heat transfer surface of each of the plurality of thermoelectric devices is in thermal communication with at least a portion of the wall of at least one of the plurality of tubes; and
providing a plurality of heat exchanger fins;
placing each of the plurality of heat exchanger fins in thermal communication with the second heat transfer surface of at least one of the plurality of thermoelectric devices, wherein the plurality of heat exchanger fins are configured to substantially increase a surface area of thermal communication between the plurality of thermoelectric devices and a working fluid flowing outside the plurality of hollow tubes beyond the surface area of thermal communication of the heat exchanger without the plurality of heat exchanger fins.
13. The method of claim 12, further comprising operatively connecting a control system to the plurality of thermoelectric devices, the control system configured to control a direction of electric current delivered to the plurality of thermoelectric devices.
14. The method of claim 13, wherein the control system is configured to control a variable electric current delivered to the plurality of thermoelectric devices.
15. The method of claim 12, wherein at least one of the plurality of thermoelectric devices is disposed around the walls of the tubes.
16. The method of claim 12, wherein the plurality of heat exchanger fins extend radially outwardly from outer surfaces of the thermoelectric devices.
17. The method of claim 12, wherein the hollow interior portion of the plurality of tubes is configured to convey a first fluid, and the heat exchanger is configured to convey a second fluid outside the plurality of tubes.
18. The method of claim 17, wherein the first fluid is a liquid, and the second fluid is a gas.
19. The method of claim 12, wherein the heat exchanger is one of a flat tube heat exchanger, a cross flow heat exchanger, a shell and tube heat exchanger, and a counter flow heat exchanger.
20. The method of claim 12, wherein the control system is configured to control the magnitude of the electric current delivered to the at least one thermoelectric device in order to select a heating and cooling capacity of the at least one thermoelectric device.
US12/877,035 2006-08-02 2010-09-07 Heat exchanger tube having integrated thermoelectric devices Abandoned US20100326092A1 (en)

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