WO2007148149A1 - Chauffage central reposant sur des radiateurs à caloducs - Google Patents

Chauffage central reposant sur des radiateurs à caloducs Download PDF

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Publication number
WO2007148149A1
WO2007148149A1 PCT/IB2006/003035 IB2006003035W WO2007148149A1 WO 2007148149 A1 WO2007148149 A1 WO 2007148149A1 IB 2006003035 W IB2006003035 W IB 2006003035W WO 2007148149 A1 WO2007148149 A1 WO 2007148149A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat
radiator
heating system
liquid conduit
heat pipe
Prior art date
Application number
PCT/IB2006/003035
Other languages
English (en)
Inventor
Nigel Joseph Copner
Original Assignee
Nigel Joseph Copner
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nigel Joseph Copner filed Critical Nigel Joseph Copner
Publication of WO2007148149A1 publication Critical patent/WO2007148149A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • 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
    • F28D1/0226—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 an intermediate heat-transfer medium, e.g. thermosiphon radiators

Definitions

  • the invention relates generally to a heating system that relies on conductive flow of a medium to transport heat energy to or from a centralized location to an area to be heated.
  • the invention is related to a new type of radiator construction to increase the efficiency of heat energy transfer in the radiator.
  • heating systems use a fluid with a high specific heat content to conduct heat from a centralized heat source to areas that are required to be heated.
  • domestic hot water systems use water to extract the heat from a boiler, and copper pipes to transport the hot water to the required area.
  • So called “radiators” are sealed metal panels that radiate thermal energy when they are heated to a specific temperature by the hot fluid (water). The amount of heat that is transferred to the room is proportional to the difference in temperature of the "radiator” and the ambient temperature of the room.
  • a typical hot water system contains about 7501 of water and 350kg of steel.
  • the specific heat capacity, C, of water is large, therefore a significant amount of heat energy must be introduced to the water/radiator system before the system can be heated to a temperature that enables a radiator to radiate heat efficiently.
  • the large amount of energy required to heat the system is the cause of significant latency in the system, which means that accurate temperature control of the area to be heated is problematic.
  • the "radiators" in the system must be heated to a specific temperature (generally 80 0 C).
  • the radiator panel will therefore cause 1 st degree burns to the skin of a young child, if the child places his hand or arm on a radiator at 8O 0 C.
  • Radiators therefore need to be insulated (or run at a cooler temperature) in areas where children are likely to be present and this reduces the efficiency of the radiators at heating the space.
  • the system is desired to be switched off, the system still contains a great amount of energy and takes time to cool. This makes quick control of the room temperature difficult, limiting accuracy of room temperature control and wastes a great deal of energy.
  • Japanese Patent publication number JP62131121 in the name of "Showa Aluminium Corporation” discloses a complicated system of water piping for a radiator heating system.
  • the vapour produced thus condenses to provide the latent heat of evaporation to heat the radiator.
  • this system of heating a radiator was found to be inefficient due to poor heat exchange from condensation of the working fluid.
  • the sealing, set-up and maintenance in such a radiator is extremely difficult and invariably leads to a short life and costly radiator.
  • in order for their radiator to be effective it needs to be plumbed into the hot water conduit so that the inefficiency in the cycling of the fluid is mitigated through better thermal conduct with the hot medium (water).
  • the present invention attempts to alleviate the above mentioned problems.
  • a heating system using a liquid for heat transmission incorporating a fluid based heat radiator mechanically separated from said liquid.
  • the heat radiator is comprises of one or more heat pipes.
  • the heat pipe is an evacuated heat pipe with a lining of a material, which allows capillary action.
  • the heat radiator is comprises of convective fins.
  • the heat pipe is thermally coupled to said liquid conduit to form a thermal joint to provide for thermal heat transfer between said liquid conduit and said heat pipe.
  • the heat radiator can be mouldable or attachable to the liquid conduit to form one mechanical piece.
  • the thermal coupling can be adjustable thereby varying the thermal conductivity through the thermal joint formed by the conduit and the heat pipe.
  • the heating system can incorporate a pre-user or user-set thermostatically operable clamping mechanism, to clamp the heat pipe to the liquid conduit.
  • the heat radiator is removable.
  • the integrity of said liquid conduit is unaffected.
  • the heat radiator can be attached in varying positions on the liquid conduit.
  • the liquid in the conduit is water based and the liquid conduit is copper based.
  • the heat pipe fluid is mainly composed of water and/or water vapour.
  • a radiator for use in a heating system, comprising: at least one heat pipe, said heat pipe comprising means to be thermally coupled to a separate heat transmitting liquid conduit; wherein said radiator and said liquid conduit are mechanically separated from each other.
  • the thermal coupling allows for thermal transfer of heat from said heat transmitting liquid conduit to said heat pipe to heat said radiator.
  • the heat pipe comprises a fluid.
  • the thermal coupling means comprises adjusting means, thereby allowing the varying of the thermal conductivity between said heat pipe and heat transmitting liquid conduit when said heat pipe is coupled to said heat transmitting liquid conduit.
  • said adjusting means comprises a clamp element to clamp said heat pipe to said heat transmitting liquid conduit.
  • the thermal coupling means can comprise a thermal block to couple said heat pipe and heat transmitting liquid conduit.
  • Figure 1 illustrates a conventional heating system
  • Figure 2 illustrates an embodiment of the inventive heating system
  • FIG. 3 illustrates one embodiment of the thermal coupling according to the present invention.
  • Figure 4 illustrates a second embodiment of the thermal coupling according to the present invention.
  • a conventional hot water heating system is illustrated, generally indicated by the reference numeral 1.
  • Hot water from a boiler flows in via a hot water pipe 2 and through a radiator 3.
  • the radiator 3 is heated by allowing convective heating from the hot water supplied from the pipe 2.
  • Cold water exits the radiator 3 and returns via the cold return pipe 4 to the boiler (not shown).
  • This type of heating system is known.
  • a heating system according to the present invention is illustrated generally indicated by the reference numeral 10.
  • the hot water from the boiler does not flow through the radiator 3 via the pipe 2.
  • a radiator 6 is provided and comprises at least one or more heat pipes 7.
  • the heat pipe 7 is clamped to the hot water pipe 2 so that heat is transmitted to the radiator 6 from the not water pipe 2 via the heat pipes 7 effectively and efficiently.
  • the heat pipe 7 can be clamped onto the hot water pipe 2 using any suitable type of coupling or means 8.
  • the water based radiator 3 is replaced with a mechanically separated radiator 6 using the heat pipes, that are mechanically separated from the hot and/or cold water pipes 2, 4.
  • the radiator 6 does not use any liquid from the boiler (not shown) to heat, i.e. no water from the heating system enters the heat pipe radiator. This allows the heat pipe based radiator 6 to be clipped onto an existing hot water conduit (such as a copper pipe).
  • the heat pipes are mainly evacuated the amount of water in the system drops dramatically and the inertia of the heating system is reduced thereby improving the temperature control and efficiency of the system. It will be appreciated that the radiator 6 can be easily moved when decorating a room or area or if changes in the position of the radiator in the room are required.
  • the heat pipes 7 are typically evacuated pipes with a lining of a material, which allows capillary action, filled with a small amount of fluid, which will evaporate at the temperature required.
  • the fluid evaporates absorbing enormous amounts of heat because of the high latent heat of vaporisation.
  • This evaporant then flows down the tube towards the cooler end where condenses. At the condensation point this heat is deposited thereby efficiently removing the heat from the hot end of the pipe.
  • the condensated fluid is pulled back to the hot end of the pipe by capillary action by the inserted lining.
  • these heat pipes respond instantaneously.
  • For more information on the general principle of heat pipe devices please refer to Grover, G.M., T. P. Cotter, and G. F. Erickson (1964). "Structures of Very High Thermal Conductance". Journal of Applied Physics 35 (6).
  • heat pipe can dissipate 20 W through an area of 1 cm 2 , so a large radiator of 2 KW would require heat pipes to be in contact with 100 cm 2 or roughly 1 meter by 1 cm of pipe. This does not sound unreasonable. Greater efficiencies are possible with heat pipes and there is great potential of being able to design much smaller heat pipe based radiators.
  • the heat pipe material can be designed to have a thermal conductivity a 1000 times higher than copper.
  • the thermal coupling of the heat pipe 7 to the hot water pipe or conduit is critical to efficient operation of the present invention.
  • the invention can utilise an adjustable clamping mechanism in order to control the thermal transfer between the hot water pipe 2 and the heat pipe 7.
  • the adjustability of the clamping mechanism allows the temperature of the heat pipe 7 to be adjusted, and thus control the temperature of the radiator. This can even be done thermostatically using methods based on expansion of dissimilar metals.
  • To improve the thermal heat transfer from the water feed pipe 2 to the heat pipe 7 designs based around flowing that water around the heat pipe could be possible. However this would involve breaking into the water feed and would not be ideal.
  • FIG 3 illustrates an example of the thermal coupling between the heat pipe 7 and the hot water pipe 2.
  • One end of the heat pipe 7 is adapted to be clamped to the hot water pipe 2 by a clamping element 11.
  • the clamping element 11 can be adjusted by clamping screws 12 and 13, which can vary the thermal contact area and the tightness of the joint formed between the heat pipe 7 and the hot water conduit 2.
  • a thermal paste can be used to improve the thermal conductivity of the joint. By changing the thermal contact area or for a given thermal conduct area the tightness or level of fit better the contacting surfaces, i.e. between the heat pipe and the hot conduit.
  • a metallic, for example copper, plate of area 1 cm 2 will allow up to 2OW of heat to pass through in either direction.
  • FIG 4 illustrates an alternative thermal coupling arrangement between the heat pipe 7 and the hot water pipe 2.
  • the heat pipe 7 can move sideways so that contact area can be varied. Fixing of the heat pipe can be achieved by screwing the heat pipe to a thermal block 14 via slotted elements (not shown) that slot (or screwed) into the base of the heat pipe 7.
  • the thermal block 14 acts like a cap to thermally couple the heat pipe 7 with the hot water pipe 2.
  • the thermal block 14 can be composed partially of thermal material (such as plastic) so as to enhance thermal variation induced by translation of the heat pipe 7.
  • the thermal block 14 can be composed of one or more heat pipes that are separate from the main heat pipe. This would allow effective heat transfer from all sides of the heat conduit pipe 2.
  • the inventive radiator basically has one or more heat pipes 7 of similar or dissimilar dimensions (round, square etc) in contact with the water feed.
  • This or these heat pipes 7 can be designed to have thermal radiators (such as heat sinks) attached.
  • the heat pipes 7 can be designed to maximise the heat transfer and maybe constructed diagonally across the heat radiator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Abstract

L'invention concerne un système de chauffage qui utilise un liquide circulant à travers un conduit de liquide pour transmettre de la chaleur, ce système comprenant un radiateur thermique à fluide séparé mécaniquement dudit liquide. L'invention concerne par ailleurs un radiateur comprenant au moins un caloduc. Ce caloduc comprend des moyens pour être raccordé thermiquement à un conduit de liquide caloporteur séparé de sorte que le radiateur et le conduit de liquide soient séparés l'un de l'autre mécaniquement. Divers avantages du système et du radiateur selon l'invention sont mis en évidence dans la description.
PCT/IB2006/003035 2005-09-12 2006-09-12 Chauffage central reposant sur des radiateurs à caloducs WO2007148149A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0518551A GB0518551D0 (en) 2005-09-12 2005-09-12 Central heating system based on heat pipe radiators

Publications (1)

Publication Number Publication Date
WO2007148149A1 true WO2007148149A1 (fr) 2007-12-27

Family

ID=35221318

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/003035 WO2007148149A1 (fr) 2005-09-12 2006-09-12 Chauffage central reposant sur des radiateurs à caloducs

Country Status (2)

Country Link
GB (1) GB0518551D0 (fr)
WO (1) WO2007148149A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2951810A1 (fr) * 2009-10-27 2011-04-29 Ajmi Ouardani Rechauffeur de liquide et ses applications

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1064379A (en) * 1963-11-29 1967-04-05 Thomas Potterton Ltd Improvements in and relating to space heating radiators
GB2178156A (en) * 1985-06-28 1987-02-04 Paul Priestman Central heating system
WO2000070286A1 (fr) * 1999-05-14 2000-11-23 Stefanini, Daniel Systeme de transfert de chaleur, utilise, en particulier, pour chauffer ou refroidir des batiments

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1064379A (en) * 1963-11-29 1967-04-05 Thomas Potterton Ltd Improvements in and relating to space heating radiators
GB2178156A (en) * 1985-06-28 1987-02-04 Paul Priestman Central heating system
WO2000070286A1 (fr) * 1999-05-14 2000-11-23 Stefanini, Daniel Systeme de transfert de chaleur, utilise, en particulier, pour chauffer ou refroidir des batiments

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2951810A1 (fr) * 2009-10-27 2011-04-29 Ajmi Ouardani Rechauffeur de liquide et ses applications

Also Published As

Publication number Publication date
GB0518551D0 (en) 2005-10-19

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