WO2008009047A1 - Heat storage device - Google Patents

Heat storage device Download PDF

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Publication number
WO2008009047A1
WO2008009047A1 PCT/AU2007/000992 AU2007000992W WO2008009047A1 WO 2008009047 A1 WO2008009047 A1 WO 2008009047A1 AU 2007000992 W AU2007000992 W AU 2007000992W WO 2008009047 A1 WO2008009047 A1 WO 2008009047A1
Authority
WO
WIPO (PCT)
Prior art keywords
storage device
heat storage
heat
vessel
collector means
Prior art date
Application number
PCT/AU2007/000992
Other languages
French (fr)
Inventor
Lynton John Mckay
Original Assignee
Sheringham Investments Pty 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 AU2006903831A external-priority patent/AU2006903831A0/en
Application filed by Sheringham Investments Pty Ltd filed Critical Sheringham Investments Pty Ltd
Publication of WO2008009047A1 publication Critical patent/WO2008009047A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
    • C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
    • 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
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F24H4/04—Storage heaters
    • 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
    • F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
    • F28D20/023—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Definitions

  • the present invention relates to a heat storage device and relates particularly, although not exclusively, to a heat storage device that can be used in preheating a liquid.
  • under-sink units which are self-contained and provide both hot and chilled water. Such units are compact and will supply the hot and chilled water from a common source of cold water.
  • the unit must include a heating device for the hot water and a chilling (refrigeration) device for the chilled water.
  • the units should recycle, where possible, any wasted energy to improve the efficiency of the unit and reduce the running cost thereof.
  • a heat storage device including a sealed vessel formed from a first heat conducting material, a heat collector means to transfer heat to said vessel, said vessel further including a composition having a high latent heat of fusion and a second heat conducting material located within said vessel to provide increased heat transfer throughout said vessel.
  • said second heating material is a metallic mesh dispersed throughout said vessel.
  • the composition will melt at about the temperature desired for the heat storage device.
  • said composition includes an aqueous mixture containing sodium sulphate.
  • said aqueous mixture is sealed in said vessel whilst said mixture is in a liquid state.
  • a further heat collector means for heating a liquid flowing therethrough is located in said vessel and said metallic mesh is packed around said heat collector means and said further heat collector means.
  • Fig. 1 is a partial cross-sectional view of a part of a heating unit incorporating the heat storage device of the present invention.
  • Fig. 2 is a cross-sectional view along and in the directions of arrows
  • Fig. 3 is a graph of the energy used against increasing temperature of iron, water and sodium sulphate.
  • Fig. 1 there is shown a part of a hot and chilled water dispenser of the type sold under the registered trade mark of Billi which includes a compressor 10 forming part of a refrigeration unit (not shown) for providing chilled water (not shown).
  • Compressor 10 has a metallic housing 12 with a lid 14, which is in thermal contact with a heat storage device 16.
  • the heat storage 16 includes an indentation 18 having a complementary shape to that of lid 14.
  • Heat storage device 16 has a condenser coil 20 from compressor 10 located therein to provide heating therefor from the hot gases produced by compressor 10.
  • the gases exiting condenser coil 20 through outlet 22 will be cooled before returning to compressor 10.
  • a further coil 24 is located within heat storage device 16.
  • This coil 24 has a cold water inlet 26 and a warm water outlet 28.
  • Outlet 28 is coupled to a hot water tank 30.
  • Water 32, inside tank 30, will be preheated to reduce the energy required in heating water 30.
  • An additional heater (not shown) will be required in water tank 30 to produce boiling water.
  • Heat storage device 16 has strands 34 dispersed throughout.
  • the strands 34 may be individual or be linked in a mesh type arrangement.
  • the strands will be in thermal contact with coils 20 and 24, and may be formed of a metallic material.
  • an expanded copper metal mesh is located around coils 20 and 24 and throughout heat storage device 16.
  • a mixture containing water and sodium sulphate is poured therein and the heat storage device 16 is then sealed.
  • the mixture is poured as a warm liquid to ensure that the sodium sulphate is in its liquid phase and not its solid or crystalline phase.
  • the mixture will flow through the mesh and be uniformly dispersed.
  • Sodium sulphate changes from a solid to a liquid at about 32 0 C and is considered to have a relatively high latent heat of fusion.
  • the graph in Fig. 3 illustrates the large amount of energy absorbed by the sodium sulphate as it passes through its melting point.
  • the sodium sulphate will absorb the energy until the transition from solid to liquid has been completed. This differs from the water and iron graphs, which are increasing at a uniform rate as they are not near their melting points. The reverse will also occur when the liquid to solid transition occurs, as energy will be liberated as opposed to being absorbed.
  • the sodium sulphate solution is a relatively poor conductor of heat. This will reduce the effectiveness of heat transfer to and from coils 20 and 24. Liquids transfer heat readily through conduction and convection whenever solids rely on conduction.
  • the mesh 34 will allow increased heat transfer through their contact with coils 20 and 24 and the solution.
  • the heat storage device will be maintained around the melting point of sodium sulphate. This will allow the cold water entering inlet 26 to be warmed to about 32 0 C before exiting through outlet 28. This conservation of energy will reduce the cost of heating water 32 to boiling point. Additional heat will also be produced by the heat sink effect of the thermal contact of the lid 14 with the indentation 18 of the heat storage device 16.
  • the invention is not restricted to that use.
  • the invention can be used where any heating of a liquid is required.
  • the nature of the mixture included within the heat storage device can vary depending on the operating temperature required. Wax may be a useful alternative.
  • the mesh can be substituted by any suitable conductive material that can be readily dispersed in the vessel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Central Heating Systems (AREA)

Abstract

The invention provides a heat storage device (16), including a sealed vessel, formed from a first heat conducting material and a heat collector means (20) to transfer heat to the vessel. The vessel further includes a composition having a high latent heat of fusion and a second heat conducting material (34) located within the vessel to provide increased heat transfer throughout the vessel.

Description

HEAT STORAGE DEVICE
The present invention relates to a heat storage device and relates particularly, although not exclusively, to a heat storage device that can be used in preheating a liquid.
It is common to find under-sink units, which are self-contained and provide both hot and chilled water. Such units are compact and will supply the hot and chilled water from a common source of cold water. The unit must include a heating device for the hot water and a chilling (refrigeration) device for the chilled water. The units should recycle, where possible, any wasted energy to improve the efficiency of the unit and reduce the running cost thereof.
It is an object to provide a heat storage device, which can preheat anything passing therethrough.
According to the invention, there is provided a heat storage device including a sealed vessel formed from a first heat conducting material, a heat collector means to transfer heat to said vessel, said vessel further including a composition having a high latent heat of fusion and a second heat conducting material located within said vessel to provide increased heat transfer throughout said vessel.
Preferably said second heating material is a metallic mesh dispersed throughout said vessel. Preferably the composition will melt at about the temperature desired for the heat storage device. In a preferred embodiment said composition includes an aqueous mixture containing sodium sulphate. In a practical embodiment said aqueous mixture is sealed in said vessel whilst said mixture is in a liquid state. Preferably a further heat collector means for heating a liquid flowing therethrough is located in said vessel and said metallic mesh is packed around said heat collector means and said further heat collector means. An embodiment of the present invention will now be described by way of example, with reference to the accompanying drawings, in which:-
Fig. 1 is a partial cross-sectional view of a part of a heating unit incorporating the heat storage device of the present invention.
Fig. 2 is a cross-sectional view along and in the directions of arrows
2-2 in Fig. 1 ; and
Fig. 3 is a graph of the energy used against increasing temperature of iron, water and sodium sulphate.
In Fig. 1 there is shown a part of a hot and chilled water dispenser of the type sold under the registered trade mark of Billi which includes a compressor 10 forming part of a refrigeration unit (not shown) for providing chilled water (not shown). Compressor 10 has a metallic housing 12 with a lid 14, which is in thermal contact with a heat storage device 16. In this embodiment the heat storage 16 includes an indentation 18 having a complementary shape to that of lid 14.
Heat storage device 16 has a condenser coil 20 from compressor 10 located therein to provide heating therefor from the hot gases produced by compressor 10. The gases exiting condenser coil 20 through outlet 22 will be cooled before returning to compressor 10. A further coil 24 is located within heat storage device 16. This coil 24 has a cold water inlet 26 and a warm water outlet 28. Outlet 28 is coupled to a hot water tank 30. Water 32, inside tank 30, will be preheated to reduce the energy required in heating water 30. An additional heater (not shown) will be required in water tank 30 to produce boiling water.
Heat storage device 16 has strands 34 dispersed throughout. The strands 34 may be individual or be linked in a mesh type arrangement. The strands will be in thermal contact with coils 20 and 24, and may be formed of a metallic material. Typically, an expanded copper metal mesh is located around coils 20 and 24 and throughout heat storage device 16. In order to complete the heat storage device 16, a mixture containing water and sodium sulphate is poured therein and the heat storage device 16 is then sealed. The mixture is poured as a warm liquid to ensure that the sodium sulphate is in its liquid phase and not its solid or crystalline phase. The mixture will flow through the mesh and be uniformly dispersed. Sodium sulphate changes from a solid to a liquid at about 320C and is considered to have a relatively high latent heat of fusion.
The graph in Fig. 3 illustrates the large amount of energy absorbed by the sodium sulphate as it passes through its melting point. The sodium sulphate will absorb the energy until the transition from solid to liquid has been completed. This differs from the water and iron graphs, which are increasing at a uniform rate as they are not near their melting points. The reverse will also occur when the liquid to solid transition occurs, as energy will be liberated as opposed to being absorbed. In the solid state, the sodium sulphate solution is a relatively poor conductor of heat. This will reduce the effectiveness of heat transfer to and from coils 20 and 24. Liquids transfer heat readily through conduction and convection whenever solids rely on conduction. The mesh 34 will allow increased heat transfer through their contact with coils 20 and 24 and the solution. Typically, the heat storage device will be maintained around the melting point of sodium sulphate. This will allow the cold water entering inlet 26 to be warmed to about 320C before exiting through outlet 28. This conservation of energy will reduce the cost of heating water 32 to boiling point. Additional heat will also be produced by the heat sink effect of the thermal contact of the lid 14 with the indentation 18 of the heat storage device 16.
Although the preferred embodiment has been described with reference to its use in a hot and chilled water dispenser, the invention is not restricted to that use. The invention can be used where any heating of a liquid is required. The nature of the mixture included within the heat storage device can vary depending on the operating temperature required. Wax may be a useful alternative. The mesh can be substituted by any suitable conductive material that can be readily dispersed in the vessel. Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as
"comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
The invention will be understood to embrace many further modifications as will be readily apparent to persons skilled in the art and which will be deemed to reside within the broad scope and ambit of the invention, there having been set forth herein only the broad nature of the invention and a certain specific embodiment by way of example.

Claims

The claims defining the invention are as follows:
1. A heat storage device including a sealed vessel formed from a first heat conducting material, a heat collector means to transfer heat to said vessel, said vessel further including a composition having a high latent heat of fusion and a second heat conducting material located within said vessel to provide increased heat transfer throughout said vessel.
2. The heat storage device of claim 1 , wherein said second heating material is a metallic mesh dispersed throughout said vessel.
3. The heat storage device of claim 1 or claim 2, wherein the composition will melt at about the temperature desired for the heat storage device.
4. The heat storage device of any one of the preceding claims, wherein said composition includes an aqueous mixture containing sodium sulphate.
5. The heat storage device of claim 4, wherein said aqueous mixture is sealed in said vessel whilst said mixture is in a liquid state.
6. The heat storage device of any one of claims 2 to 5, wherein a further heat collector means for heating a liquid flowing therethrough is located in said vessel and said metallic mesh is packed around said heat collector means and said further heat collector means.
7. The heat storage device of any one of the preceding claims, wherein said second heating material is an expanded copper metal mesh.
8. The heat storage device of any one of claims 1 to 7, wherein said second heating material is strands of metallic material.
9. The heat storage device of any one of the preceding claims, wherein said heat collector means includes a condenser coil from a compressor of a refrigeration unit.
10. The heat storage device of claim 9, wherein a further coil is provided which is heated by said heat storage device.
1 1. The heat storage device of claim 10, wherein said further coil preheats water in said further coil as part of a hot water dispenser.
12. The heat storage device of any one of claims 1 to 3, wherein said composition is wax.
PCT/AU2007/000992 2006-07-17 2007-07-17 Heat storage device WO2008009047A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2006903831 2006-07-17
AU2006903831A AU2006903831A0 (en) 2006-07-17 Heat storage device

Publications (1)

Publication Number Publication Date
WO2008009047A1 true WO2008009047A1 (en) 2008-01-24

Family

ID=38956423

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2007/000992 WO2008009047A1 (en) 2006-07-17 2007-07-17 Heat storage device

Country Status (1)

Country Link
WO (1) WO2008009047A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016030740A1 (en) * 2014-08-26 2016-03-03 Cornelius Deutschland Slurries of granulate material for use in cooling devices
WO2019222806A1 (en) * 2018-05-25 2019-11-28 Billi Australia Pty Ltd Improvements in refrigeration

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801523A (en) * 1952-05-15 1957-08-06 Charles C Hansen Defrosting apparatus for refrigeration systems
US4341262A (en) * 1980-05-05 1982-07-27 Alspaugh Thomas R Energy storage system and method
NL8201857A (en) * 1982-05-06 1983-12-01 Ir Leonard Hupkes Solar heat storage vessel - contains heat supply and extract tubes in e.g. salt with 50-80 deg. centigrade m.pt. and connected via metal gauze
US20030121637A1 (en) * 2001-12-31 2003-07-03 Dae-Young Lee Heat exchanger
DE10332162A1 (en) * 2003-07-15 2005-02-03 Access Materials&Processes Latent heat storage system employs a metal sponge in which a phase change material is embedded
US20050258394A1 (en) * 2004-05-18 2005-11-24 Sgl Carbon Ag Latent heat storage material, latent heat storage unit containing the material, processes for producing the material and the unit and processes for using the material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801523A (en) * 1952-05-15 1957-08-06 Charles C Hansen Defrosting apparatus for refrigeration systems
US4341262A (en) * 1980-05-05 1982-07-27 Alspaugh Thomas R Energy storage system and method
NL8201857A (en) * 1982-05-06 1983-12-01 Ir Leonard Hupkes Solar heat storage vessel - contains heat supply and extract tubes in e.g. salt with 50-80 deg. centigrade m.pt. and connected via metal gauze
US20030121637A1 (en) * 2001-12-31 2003-07-03 Dae-Young Lee Heat exchanger
DE10332162A1 (en) * 2003-07-15 2005-02-03 Access Materials&Processes Latent heat storage system employs a metal sponge in which a phase change material is embedded
US20050258394A1 (en) * 2004-05-18 2005-11-24 Sgl Carbon Ag Latent heat storage material, latent heat storage unit containing the material, processes for producing the material and the unit and processes for using the material

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 198402, Derwent World Patents Index; Class F24, AN 1984-009387 *
DATABASE WPI Week 200514, Derwent World Patents Index; Class F28, AN 2005-124209 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016030740A1 (en) * 2014-08-26 2016-03-03 Cornelius Deutschland Slurries of granulate material for use in cooling devices
US10465979B2 (en) 2014-08-26 2019-11-05 Cornelius Deutchland Slurries of granulate material for use in cooling devices
WO2019222806A1 (en) * 2018-05-25 2019-11-28 Billi Australia Pty Ltd Improvements in refrigeration

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