WO2003106777A1 - Panneau isolant a isolation par le vide de corps maintenus pendant longtemps a haute temperature - Google Patents

Panneau isolant a isolation par le vide de corps maintenus pendant longtemps a haute temperature Download PDF

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Publication number
WO2003106777A1
WO2003106777A1 PCT/IT2003/000360 IT0300360W WO03106777A1 WO 2003106777 A1 WO2003106777 A1 WO 2003106777A1 IT 0300360 W IT0300360 W IT 0300360W WO 03106777 A1 WO03106777 A1 WO 03106777A1
Authority
WO
WIPO (PCT)
Prior art keywords
panel
insulating panel
evacuated
evacuated insulating
filling material
Prior art date
Application number
PCT/IT2003/000360
Other languages
English (en)
Inventor
Pierattilio Di Gregorio
Original Assignee
Saes Getters S.P.A.
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 Saes Getters S.P.A. filed Critical Saes Getters S.P.A.
Priority to AU2003237609A priority Critical patent/AU2003237609A1/en
Publication of WO2003106777A1 publication Critical patent/WO2003106777A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B1/78—Heat insulating elements
    • E04B1/80—Heat insulating elements slab-shaped
    • E04B1/803—Heat insulating elements slab-shaped with vacuum spaces included in the slab
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2201/00—Insulation
    • F25D2201/10—Insulation with respect to heat
    • F25D2201/14—Insulation with respect to heat using subatmospheric pressure
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/24—Structural elements or technologies for improving thermal insulation
    • Y02A30/242—Slab shaped vacuum insulation
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B80/00—Architectural or constructional elements improving the thermal performance of buildings
    • Y02B80/10—Insulation, e.g. vacuum or aerogel insulation

Definitions

  • the present invention relates to an evacuated insulating panel allowing to obtain the thermal insulation of bodies which stay constantly at a high temperature for long times.
  • evacuated panels and in particular those made of plastic materials, are finding an increasing use in all fields where thermal insulation of bodies at temperatures lower than about 100 °C is required.
  • applications there may be named the walls of household and industrial refrigerators or of containers for isothermal transportation of drugs or cold or deep-frozen foods.
  • Applications of these panels in the building field or motorcar industry are also, envisaged.
  • an evacuated panel is formed of an envelope within which a filling material is present.
  • the envelope has the aim of preventing (or reduce as much as possible) the entry of atmospheric gases into the panel, so as to maintain a vacuum level that is consistent with the thermal insulation degree required by the application.
  • the envelope is formed with so-called "barrier" sheets that are characterized by a gas permeability as low as possible, and can be made of a single component, but more usually are multi-layers of different components. In the case of multi-layers the "barrier" effect is given by one of the constituting layers, the other layers playing generally the role of mechanical support and protection of the barrier layer.
  • the filling material has mainly the function of keeping spaced the two faces of the envelope when vacuum is applied to the panel, besides having other features that will be pointed out later.
  • This material can be inorganic, such as for instance silica powder, glass fibers, aerogels, diatomaceous earth, etc.; or organic, such as stiff polymeric foams, both in the form of boards and of powders.
  • the filling material must anyway be porous or discontinuous, so that the porosities or interstices can be evacuated.
  • these panels comprise also , one or more materials (generally referred to as getter materials) which are capable of sorbing these gases thus maintaining the pressure witliin the panel at the desired values.
  • panels filled with polymeric foams find can hardly be used when the body to be insulated maintains a high temperature for long periods, such as for instance in the case of water heaters, vending machines of warm beverages or pipelines for the transport of oil in arctic regions.
  • the evacuated panel should be placed in direct contact with surfaces that remain constantly at temperatures higher than 60-80 °C for long times, in some cases even of years.
  • the stiff polymeric foams may resist unaltered at such temperatures for times up to a few tens of minutes, but for longer times these materials show a tendency to degradation and outgassing.
  • the released gaseous substances saturate the porosities of the material with a consequent increase of the pressure within the panel and thus of the thermal conductivity of the latter.
  • thermoinsulating material capable of resisting at - high temperatures.
  • the panel would be in contact with the surface of said layer opposed to the one contacting the hot body; thanks to the insulating properties of this layer, the surface contacting the panel would be at a lower temperature, thus protecting the panel.
  • the thickness (and corresponding the volume) of said insulating layer would be generally large, involving important drawbacks also of economical type.
  • the thickness (and corresponding the volume) of said insulating layer would be generally large, involving important drawbacks also of economical type.
  • Patent application WO 98/59194 discloses an evacuated insulating panel that can be used in the production of insulating elements, for example the- ones employed in outer walls of refrigerators and freezers. These elements generally comprise a double wall structure in which the panels are accommodated; To keep the panels in the desired position, the production of such elements involves, after mounting of the evacuated panels, a step in which a foam is produced in the double wall structure, that solidifying fills any void left by the panels. During this step a lot of heat is produced, and the temperature of the foam about the panels may grow up even to 150 °C. As a consequence, the functioning of panels comprising polymeric filling materials can become jeopardized, mainly when said .
  • the filling of panels as described in the above-named patent application is made up of two superimposed layers of different polymeric foams, the first layer being made of an open cell polystyrene foam and the second being made of an open cell polyurethane foam.
  • the panel is mounted in the structure so that the side of the panel where the polyurethane layer is located is the one exposed to the cited high temperatures during said foaming step.
  • the polyurethane layer being more heat-resistant, protects from thermal degradation the underlying polystyrene layer.
  • the panels of WO 98/59194 are thus capable to withstand high temperatures for only times, but cannot be used in applications where either of their sides is to be exposed at high temperatures for long times, as in that the polyurethane material would degrade too as described previously. • . ⁇
  • the object of the present invention is therefore to provide an evacuated panel for the thermal insulation of high temperature bodies. Said object is achieved by an evacuated panel whose main features are specified in first claim and other features are specified in the subsequent claims.
  • the panel has the advantage of being capable to be also utilized for long times in direct contact with bodies having high temperatures, and accordingly it can be used in such applications as pipelines for conveying warm fluids, vending .. r machines for coffee and other warm beverages, water heaters, etc.
  • the panel according to the invention can be also utilized to insulate hardly reachable pipelines such as the underwater ones or those that pipe crude oil in arctic regions, where it is mandatory to arrange insulating panels not requiring maintenance and which need not be replaced for various tens of years.
  • Another advantage of the evacuated insulating panel according to the present invention resides in its reduced thickness.
  • a material such as glass wool or the like decreases 10-15 times by 'going from the atmospheric pressure to a reduced pressure existing within the evacuated panel according to the present invention.
  • Glass wool for instance, has a thermal conductivity of about 35-45 mW/(m x K) at atmospheric pressure, that drops to about 2.5-3 mW/(m x K) when the material is inserted within the panel.
  • the evacuated insulating panel according to the invention shows, with equal thickness, better thermo-insulating properties with respect to panels comprising a filling material formed by polymeric foams only.
  • the panel according to the invention may be advantageously used as an alternative to the known panels even at low temperatures, particularly from 60 °C down to the cryogenic temperatures.
  • a further advantage of the evacuated panel according to an advantageous embodiment of the invention resides in that, thanks to the particular structure of the filling material thereof, it can be curved until it adheres to the walls of a body (cylindrical or of a similar shape) to be insulated.
  • FIG. 2 shows a cross section of an evacuated panel according to another embodiment of the present invention.
  • an evacuated panel 10 comprises an. envelope 11 " of a known type, formed for example by two barrier sheets sealed along their edges,: within which a filling material 12 of polymeric type, such as polyurethane or polystyrene, is placed and a layer 13 of glass wool or rock wool or another similar material is disposed on the face of the panel that is put in contact with the high temperature body. Said layer 13 gives the panel the property of withstanding high temperatures. In fact, thanks to the presence of said layer 13, the panel 10 can be arranged in contact with bodies having temperatures up to about 150 °C, contrary to known evacuated insulating panels based on polymeric filling materials only, . which cannot withstand temperatures higher than 80 °C for long times.
  • a panel 20 comprises an envelope 21 within which a filling material 22 is placed, having superimposed thereon a layer 23 of glass wool or rock wool.
  • the filling material 22 is in turn formed by a plurality of mutually superimposed thin boards of an open cell polymeric foam, hi this way the insulating panel can be curved and made to adhere to the outer surfaces of cylindrical bodies having a high temperature, for example water heaters.
  • the invention describes evacuated insulating panels designed to keep a warm body at a constant temperature in cold environments, but obviously it embraces also the cases in which it is desired to keep low the temperature in a hot environment. To obtain this it is enough to position the panel with the glass wool layer directed to the hot environment.

Abstract

la présente invention concerne un panneau à isolation par le vide (10; 20) destiné à l'isolation thermique de corps maintenus à des hautes températures pendant de longues périodes, comprenant une enveloppe souple (11; 21) constituée d'une ou de multiples feuilles écrans dans laquelle sont disposés un matériau polymère de remplissage à alvéoles ouverts (12; 22) et au moins une couche d'un matériau (13; 23) présentant de bonnes propriétés d'isolation et de stabilité thermiques.
PCT/IT2003/000360 2002-06-17 2003-06-11 Panneau isolant a isolation par le vide de corps maintenus pendant longtemps a haute temperature WO2003106777A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003237609A AU2003237609A1 (en) 2002-06-17 2003-06-11 Evacuated insulating panel for the insulation of bodies having a high temperature for long times

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2002A001342 2002-06-17
IT2002MI001342A ITMI20021342A1 (it) 2002-06-17 2002-06-17 Pannello isolante evacuato per l'isolamento di corpi a temperatura elevata

Publications (1)

Publication Number Publication Date
WO2003106777A1 true WO2003106777A1 (fr) 2003-12-24

Family

ID=29727283

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2003/000360 WO2003106777A1 (fr) 2002-06-17 2003-06-11 Panneau isolant a isolation par le vide de corps maintenus pendant longtemps a haute temperature

Country Status (3)

Country Link
AU (1) AU2003237609A1 (fr)
IT (1) ITMI20021342A1 (fr)
WO (1) WO2003106777A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004502118A (ja) * 2000-06-30 2004-01-22 サエス　ゲッターズ　ソチエタ　ペル　アツィオニ 非平面を有する物体の断熱用の真空パネル
US7854241B2 (en) * 2004-05-07 2010-12-21 Saipem S.A. Metal-clad insulating complex for a pipe
WO2016119566A1 (fr) * 2015-01-26 2016-08-04 黄国平 Panneau d'isolation sous vide

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2009098A1 (fr) * 1968-05-22 1970-01-30 Becker Otto
DE29811136U1 (de) * 1997-06-25 1998-10-08 Uvt Gmbh Vakuumisolationspaneel
WO1998059194A1 (fr) 1997-06-24 1998-12-30 Bayer Aktiengesellschaft Panneau d'isolation a vide combine en polystyrol et polyurethanne ainsi que son utilisation pour la production d'elements d'isolation
DE19814271A1 (de) * 1998-03-31 1999-11-25 Uvt Umwelt Und Verfahrens Tech Vakuumisolationspaneele
WO2002002987A1 (fr) 2000-06-30 2002-01-10 Saes Getters S.P.A. Panneau sous vide destine a l'isolation thermique d'un corps a surface non planes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2009098A1 (fr) * 1968-05-22 1970-01-30 Becker Otto
WO1998059194A1 (fr) 1997-06-24 1998-12-30 Bayer Aktiengesellschaft Panneau d'isolation a vide combine en polystyrol et polyurethanne ainsi que son utilisation pour la production d'elements d'isolation
DE29811136U1 (de) * 1997-06-25 1998-10-08 Uvt Gmbh Vakuumisolationspaneel
DE19814271A1 (de) * 1998-03-31 1999-11-25 Uvt Umwelt Und Verfahrens Tech Vakuumisolationspaneele
WO2002002987A1 (fr) 2000-06-30 2002-01-10 Saes Getters S.P.A. Panneau sous vide destine a l'isolation thermique d'un corps a surface non planes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004502118A (ja) * 2000-06-30 2004-01-22 サエス　ゲッターズ　ソチエタ　ペル　アツィオニ 非平面を有する物体の断熱用の真空パネル
US7854241B2 (en) * 2004-05-07 2010-12-21 Saipem S.A. Metal-clad insulating complex for a pipe
WO2016119566A1 (fr) * 2015-01-26 2016-08-04 黄国平 Panneau d'isolation sous vide

Also Published As

Publication number Publication date
AU2003237609A1 (en) 2003-12-31
ITMI20021342A1 (it) 2003-12-17

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