AU2009329804B2 - A heat exchanger and a water heater incorporating same - Google Patents

A heat exchanger and a water heater incorporating same Download PDF

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Publication number
AU2009329804B2
AU2009329804B2 AU2009329804A AU2009329804A AU2009329804B2 AU 2009329804 B2 AU2009329804 B2 AU 2009329804B2 AU 2009329804 A AU2009329804 A AU 2009329804A AU 2009329804 A AU2009329804 A AU 2009329804A AU 2009329804 B2 AU2009329804 B2 AU 2009329804B2
Authority
AU
Australia
Prior art keywords
water heater
heat exchanger
length
hollow cylinder
heat
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.)
Ceased
Application number
AU2009329804A
Other versions
AU2009329804A1 (en
Inventor
Patrick Pussell
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.)
DUX Manufacturing Ltd
Original Assignee
DUX Manufacturing Ltd
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
Priority claimed from AU2008906641A external-priority patent/AU2008906641A0/en
Application filed by DUX Manufacturing Ltd filed Critical DUX Manufacturing Ltd
Priority to AU2009329804A priority Critical patent/AU2009329804B2/en
Publication of AU2009329804A1 publication Critical patent/AU2009329804A1/en
Application granted granted Critical
Publication of AU2009329804B2 publication Critical patent/AU2009329804B2/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F24H1/208—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes with tubes filled with heat transfer fluid
    • 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
    • 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
    • F28D1/0475—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 having a single U-bend
    • 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
    • F28F1/003—Multiple wall conduits, e.g. for leak detection
    • 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
    • F28F1/24—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 transversely
    • F28F1/30—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 transversely the means being attachable to the element
    • 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
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D2020/0065—Details, e.g. particular heat storage tanks, auxiliary members within tanks
    • F28D2020/0078—Heat exchanger arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2270/00—Thermal insulation; Thermal decoupling

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Fluid Heaters (AREA)

Abstract

A heat exchanger (10) for a water heater. The heat exchanger (10) has a first part (12) and second part (14). A heat exchanging medium flows through the first and second parts. The majority of the length of the first part (12) is in direct heat exchanging contact with a substance to be heated and the majority of the length of the second part (14) is encased in an insulative material or substantially thermally isolated from the substance to be heated.

Description

WO 20101071916 PCT/AU2009/001269 A HEAT EXCHANGER AND A WATER HEATER INCORPORATING SAME Field of the Invention The present invention relates to a heat exchanger and a water heater incorporating same. The invention has been primarily developed for use with domestic and commercial water heaters and will be described with reference to these applications. However, the invention is not limited to these particular applications, and is also suitable for use with heat exchangers using heat conducting fluids other than water. Background of the Invention Heat exchangers for water heaters that have a hollow, generally elongate, U shaped configuration are known. Heat exchangers of this type have an inlet and an outlet, both near the top of the water heater tank, and a length slightly less than the height of the water heater tank. High temperature heat exchanging fluid flows downwardly from the heat exchanger's inlet, to near the bottom of the water heater tank. The heat exchanging fluid is then directed in a generally opposite upwardly direction and flows from the bottom of the tank to the top of the tank and so to the heat exchanger outlet. As the heat exchanging fluid travels through the heat exchanger, it heats the heat exchanger which then transfers heat to the surrounding water, thereby raising its temperature. As this occurs, the temperature of the heat exchanging fluid is also lowered. During this process it is possible for the falling temperature of the heat exchanging fluid to equal that of the rising temperature of the surrounding water. As a result, from that point onwards in the heat exchanger, heat transfer is reversed and heat is transferred from the (hotter) water to the (cooler) heat transfer medium. This wastes energy and reduces the efficiency of the heat exchanger and thus the water heater overall. Object of the Invention It is the object of the present invention to substantially overcome or at least ameliorate the above disadvantage.
2 Summary of the Invention Accordingly, the present invention provides a water heater including: a tank adapted for containing water; and a heat exchanger substantially within the tank and including a first part, through which a heat exchanging medium flows, and a second part, through which the heat exchanging medium flows, the majority of the length of the exterior of the first part being in direct heat exchanging contact with the water in the tank and the majority of the length of the exterior of the second part is surrounded by a hollow cylinder thereby creating an insulative air gap between the majority of the length of the exterior of the second part and water in the tank, wherein the second part has an upstream end in fluid communication with a downstream end of the first part and the hollow cylinder is sealingly connected to the exterior of the second part at or near said upstream end.
WO 2010/071916 PCT/AU2009/001269 3 Preferably, in the first part, the heat exchanging medium generally flows in a first direction and, in the second part, the heat exchanging medium generally flows in a second direction, generally opposite to the first direction. Preferably, substantially all of the length of the second part is encased in an insulative material. Preferably, substantially all of the length of the second part is substantially thermally isolated from the substance to be heated. In one form, the heat exchanger first part is a hollow cylinder, most preferably formed from coiled tube, and the second part is generally straight tube, most preferably positioned within the hollow cylinder. In another form, the heat exchanger first part is generally straight tube, most preferably having heat exchanging fins externally attached thereto, and the second part is a generally straight tube. The heat exchanger first part preferably includes an inlet, most preferably with a length of insulative material substantially adjacent thereto. The heat exchanger second part preferably includes an outlet, most preferably with a length of insulative material substantially adjacent thereto. The heat exchanger is preferably generally in the shape of an elongate U. The heat exchanger preferably includes a third part joining the downstream end of the first part to the upstream end of the second part. The insulative material is preferably an air gap within an external cover, most preferably a cylindrical cover of like material to the heat exchanger material. Alternatively, the insulative material can be a solid or semi solid insulative material applied to the exterior surface of the second part, such as a close coupled polymer that has a low heat transfer coefficient compared to the heat exchanger material. Brief Description of the Drawings Preferred embodiments of the invention will now be described, by way of examples only, in which: Fig. 1 is a perspective view of a first embodiment of a heat exchanger; Fig. 2 is an enlarged partial perspective view of the heat exchanger shown in Fig. 1; Fig. 3 is a perspective view of a second embodiment of a heat exchanger; and Fig. 4 is an enlarged partial view of the heat exchanger shown in Fig. 3.
WO 2010/071916 PCT/AU2009/001269 4 Detailed Description of the Preferred Embodiments Fig. 1 shows a first embodiment of a hollow heat exchanger 10 suitable for use in a domestic water heater of 25 to 500 litre capacity. The heat exchanger 10 has a generally elongated U-shaped configuration. The heat exchanger 10 has a first part 12 and a second part 14 which are joined by a third part 16. The heat exchanger 10 also has an inlet 18 and an outlet 20 which are positioned external to the tank of the water heater, near its upper end. The majority of the length of the first part 12 has external heat exchanging fins 22 attached thereto, to increase its heat transfer surface area. The majority of the length of the second part 14 is encased in an insulative material, in the form of an air gap between the exterior of the second part 14 and the interior of a copper cylinder 24. The bottom of the cylinder 24 is sealed with respect to the exterior of the second part 14, adjacent the bottom thereof. A smaller portion 26 of the first part 12, adjacent the inlet 18, is also encased in similar insulative material, to prevent heat loss to atmosphere as this portion of the first part 12 is external to the tank. A different metal could be used for the cylinder 24 but like metals reduce corrosion risk. The hollow material of the first 12, second 14 and third 16 parts of the heat exchanger 10 is preferably constructed from double walled copper pipe, a description of which can be found in the Applicant's International PCT Patent Application No. PCT/AU2006/001086. The double walled copper pipe has an external diameter of 6 8mm. The heat exchanger 10 is typically installed in the water tank of a water heater through an opening in an upper end of the tank and extends through substantially all of the length of the tank. In use, relatively high temperature heat exchanger fluid is pumped into the inlet 18 of the heat exchanger 10 and it flows in a generally downward direction through the length of the first part 12. As the heat exchanging fluid travels through the first part 12, heating energy is transferred through the walls of the first part 12, and also through the fins 22, causing the temperature of the surrounding water to rise. When the heat exchanging fluid reaches the bottom of the first part 12 it travels through the third part 16 and into the second part 14. The fluid then travels through the second part 14 in the opposite upward direction towards the outlet 20. During its passage through the first part 12, the heat exchanger fluid reduces in temperature to a level approximately equal to that WO 2010/071916 PCT/AU2009/001269 5 of the (now heated) water in the tank. As the heat exchanging fluid flows through the length of the second part 14, the insulative material 24 prevents (or at least minimises) substantial heat transfer from the heated water to the heat exchanging fluid. This results in an improvement of the heat transfer from the heat exchanging fluid to the water, thereby improving the efficiency of the heat exchanger and thus the water heater overall. A second embodiment of heat exchanger 30 is shown in Figs. 3 and 4. The heat exchanger 30 is similar to the heat exchanger 10 shown in Figs. 1 and 2 and like features are indicated with like reference numerals. However, in the heat exchanger 30, the heat exchanging surface area of the first part 12 is increased by forming the majority of the length of the first part 12 into a cylinder of a tightly wound spiral configuration. In addition, in the heat exchanger 30, the insulated second part 14 is positioned inside the cylindrical first part 12. The first 12, second 14 and third 16 parts of the heat exchanger 30 are again formed from the double walled copper pipe described in the aforementioned PCT application. The operation of the heat exchanger 30 is also substantially identical to that previously described with reference to the heat exchanger 10. However, whilst the heat exchanging fluid flowing through the first part 12 still travels overall in a downward direction, it does so whilst simultaneously spiralling. To maximise efficiency, the heat exchangers 10 and 30 are configured so that, in use, the refrigerant condensation point is at the bottom of the first part 12, so that it enters the insulated second part 14 in liquid form. Although the invention has been described with reference to preferred embodiments, it would be appreciated by persons skilled in the art that the invention may be embodied in many other forms. For example, the insulative material can be a close coupled polymer that has a relatively low heat transfer coefficient compared to the heat exchanger material. Also, the first, second and third parts of the heat exchanger can be made from single walled pipe.

Claims (15)

1. A water heater including: a tank adapted for containing water; and a heat exchanger substantially within the tank and including a first part, through which a heat exchanging medium flows, and a second part, through which the heat exchanging medium flows, the majority of the length of the exterior of the first part being in direct heat exchanging contact with the water in the tank and the majority of the length of the exterior of the second part being surrounded by a hollow cylinder, which creates an insulative air gap between the majority of the length of the exterior of the second part and water in the tank, wherein the second part has an upstream end in fluid communication with a downstream end of the first part and the hollow cylinder is sealingly connected to the exterior of the second part at or near said upstream end.
2. A water heater as claimed in claim 1, wherein, in the first part, the heat exchanging medium generally flows in a first direction and, in the second part, the heat exchanging medium generally flows in a second direction, generally opposite to the first direction.
3. A water heater as claimed in claim 1 or 2, wherein substantially all of the length of the second part is encased by the hollow cylinder.
4. A water heater as claimed in any one of the preceding claims, wherein the heat exchanger first part is a hollow cylinder and the second part is generally straight tube.
5. A water heater as claimed in claim 4, wherein the hollow cylinder is formed from coiled tube.
6. A water heater as claimed in claim 4 or 5, wherein the second part is positioned within the hollow cylinder.
7. A water heater as claimed in claim 1, 2 or 3, wherein the heat exchanger first part is a generally straight tube and the second part is a generally straight tube.
8. A water heater as claimed in any one of the preceding claims, wherein the heat exchanger first part has heat exchanging fins externally attached thereto. 7
9. A water heater as claimed in any one of the preceding claims wherein the heat exchanger first part includes an inlet.
10. A water heater as claimed in claim 9, wherein the inlet has a length of insulative material substantially adjacent thereto.
11. A water heater as claimed in any one of the preceding claims wherein the heat exchanger second part includes an outlet.
12. A water heater as claimed in claim 11, wherein the outlet has a length of insulative material substantially adjacent thereto.
13. A water heater as claimed in any one of the preceding claims, wherein the heat exchanger is generally in the shape of an elongate U.
14. A water heater as claimed in any one of the preceding claims wherein the heat exchanger includes a third part joining the downstream end of the first part to the upstream end of the second part.
15. A water heater as claimed in claim in any one of the preceding claims, wherein the hollow cylinder is of like material to that of the first part and the second part. Dux Manufacturing Limited Patent Attorneys for the Applicant SPRUSON & FERGUSON
AU2009329804A 2008-12-24 2009-09-24 A heat exchanger and a water heater incorporating same Ceased AU2009329804B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2009329804A AU2009329804B2 (en) 2008-12-24 2009-09-24 A heat exchanger and a water heater incorporating same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU2008906641A AU2008906641A0 (en) 2008-12-24 A heat exchanger and a water heater incorporating same
AU2008906641 2008-12-24
PCT/AU2009/001269 WO2010071916A1 (en) 2008-12-24 2009-09-24 A heat exchanger and a water heater incorporating same
AU2009329804A AU2009329804B2 (en) 2008-12-24 2009-09-24 A heat exchanger and a water heater incorporating same

Publications (2)

Publication Number Publication Date
AU2009329804A1 AU2009329804A1 (en) 2010-07-01
AU2009329804B2 true AU2009329804B2 (en) 2015-10-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
AU2009329804A Ceased AU2009329804B2 (en) 2008-12-24 2009-09-24 A heat exchanger and a water heater incorporating same

Country Status (5)

Country Link
US (1) US20110239958A1 (en)
CN (1) CN102265099B (en)
AU (1) AU2009329804B2 (en)
NZ (1) NZ592183A (en)
WO (1) WO2010071916A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107470049B (en) * 2017-09-30 2023-04-18 江西远达环保有限公司 Spray gun pipe with anti-vaporization function for desulfurization and denitrification
CN107470050B (en) * 2017-09-30 2023-04-18 江西远达环保有限公司 Spray gun with cooling effect for desulfurization and denitrification

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DE3403337A1 (en) * 1983-02-26 1984-08-30 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Appliance for heating water

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Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173872A (en) * 1978-02-01 1979-11-13 Energy Utilization Systems, Inc. Water heater apparatus
DE3403337A1 (en) * 1983-02-26 1984-08-30 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Appliance for heating water

Also Published As

Publication number Publication date
CN102265099A (en) 2011-11-30
US20110239958A1 (en) 2011-10-06
NZ592183A (en) 2013-07-26
AU2009329804A1 (en) 2010-07-01
CN102265099B (en) 2014-12-10
WO2010071916A1 (en) 2010-07-01

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