COMPOSITE STRUCTURE FOR USE AS ISOLATION

Abstract: The invention relates to a composite structure for use as isolation, comprising a thin-walled envelope (1) for bounding a space (2), which space is filled with a gas with a high insulating value, wherein the composite structure has better thermally insulating properties in the case of high temperatures and temperature differences, and heat transferring mechanisms such as heat conduction, infrared radiation, convection flows and moisture absorption are greatly reduced.

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H- O O Φ 3 φ PJ 3 3 PJ O CQ H- rr rr <! Φ •*. CQ •ξ rr Φ 0 ) H- H- φ J 3 CD ϋ rt 3 3 TJ CQ f rr PJ 3 3 Φ ID 0 LQ ϋ ii 3 3 CD Ω rt PJ H- tr rt Pa (-< φ Ω PJ i-S ii H- 3 PJ Hi ϋ & ) ii P. CQ o r Φ rt 3 3 Φ J Φ O 1-3 3 Φ Φ O J 3 H- r Φ P^ H- H- 1 P. H- CD 3 CQ h- 1 r CD PJ 3 H Ω H- - a TJ rr P* Φ 3" 3 ) H- 3 &) O O Φ H- tr CQ TJ O Φ o Φ Φ I-* Q Φ rr PJ CQ rt Hi ■≤ 3 rt Ω CD H- Φ tr O ϊ-5 Hi Hi ϋ rr Φ rt H- H- •*. O O O 3 Φ CQ & 0 ii H- 3 J a. ■ ! H- O rt r 3 TJ ϋ H- 3 ii o PJ Φ 0 3 tr tr O Pi PJ H- Φ rt 3 H ■i 3 Φ o Φ Φ H- rt 3 r Ω H- H- rt Φ Hi rt P tr rr y Ω 0 0 3 •<: - Φ • 3 A material which is particularly well suited for application in the composite structure according to the present invention is corrugated board. This material is inexpensive, strong and easily shaped and has a relatively low coefficient of heat conduction. The gas with which the space in the envelope is filled is a gas with low coefficient of heat conduction, such as a heavy gas including krypton, freon, xenon, argon or sulphur hexane fluoride, or a thin gas. A heavy gas is understood to mean a gas with a high molecular weight. Thin gas is understood to mean that a condition of greatly reduced pressure (vacuum) prevails in the space. The heat conduction of the structure is hereby reduced because of the lower heat conduction of the heavy or thin gas compared to air, and the insulating properties of the structure are improved. The space is preferably sub-divided into various compartments. Natural convection, and therefore heat transfer, are hereby reduced. On the inner and/or outer side of the envelope can further be arranged a layer sealing the envelope, for instance formed from aluminium foil or a cover layer of water glass, so as to prevent moisture absorption and to improve the insulating properties of the structure. In addition, the use of aluminium foil is advantageous to suppress infrared irradiation. The invention will be further elucidated with reference to the annexed drawing. In the drawing: Figure 1 shows a perspective view of a composite structure according to a first embodiment of the invention, Figure 2 shows a partly broken-away and perspective view of a composite structure according to a second embodiment of the invention, Figure 3 is a detail view of the isolation structure shown in figure 2, Figure 4 shows a third embodiment of an isolation structure according to the invention, Figure 5 is a perspective view of a solar energy system in which the composite structure for use as isolation is applied, and Figure 6 is a detail view of the solar energy system shown in figure 5. The composite structure for use as isolation shown in figure 1 comprises a thin-walled envelope 1 for bounding a space 2, which space 2 is filled with a gas with a high insulating value. Envelope 1 is manufactured from corrugated board which can be sealed on the inside and/or outside, for instance by means of arranging aluminium foil or a cover layer of water glass. Space 2 is sub-divided in various compartments 3 in that partition walls 4 are arranged between the corrugated board walls of envelope 1. Partition walls 4 are placed zigzagging in space 2. Figure 2 shows a second embodiment of a composite structure for use as isolation. The difference from the embodiment shown in figure 1 is that, in addition to zigzagging partition walls 3, parallel partition walls 4 are also arranged, whereby smaller compartments 3 are formed. In figure 4 is shown an isolation structure with an envelope 1 which is not rectangular. Because corrugated board readily allows of deformation, structures can be manufactured which are adapted to the space it is desired to insulate. Figure 5 shows a solar energy system 100 according to the invention in perspective view. This solar energy system 100 has a hollow collector 101 on which the solar radiation is incident and in which a heat transfer medium is arranged. Owing to the incident solar radiation the heat transfer medium in collector 101 will evaporate and rise upward in collector 101 and at the top be urged via pipes 102 through a heat exchanger, where the heat transfer medium once again condenses . The heat exchanger consists of a heat storage tank consisting of elongate elements 103 and elongate flat: ctiannel plates 104 which are placed between these elements and through which the heat transfer medium runs. The condensed heat transfer medium flows further from the heat exchanger via pipes 105 to the underside of collector 101. Solar energy system 100 further has a housing which consists of a transparent upper side 106 formed from a sandwich panel, for instance of polycarbonate, and a tray-like underside 107. Solar energy system 100 is placed with housing 106,107 directly onto roof boarding 108. In order to ensure proper sealing between housing 106,107 and the roof tiles 109 lying on roof boarding 108, the housing 106,107 further has an apron part 110, which can be adjusted to the form of roof tiles 109 by heating (see figure 6) . Apron part 110 is coupled slidably to housing 106,107, so that when housing 106, 107 expands due to heating as a result of solar radiation the apron part 110 can displace relative to housing 106,107, whereby cracking is prevented. In storage tank 103 is stored water which is heated by heat-exchange with the heat transfer medium. In order to prevent heat loss via roof boarding 108, the housing 106,107 is further filled with a composite isolation structure 111 according to the present invention (see figure 6) . On a part of the elongate elements 103 a heating element 112 can be further arranged which, in the case of a shortage of radiant heat, contributes toward the heating of the water in elongate elements 103. Partition walls 4 are preferably placed such that on the one hand free convection of the gas in compartments 3 is prevented as far as possible and on the other the total volume of partition walls 4 is as small as possible, so that as little heat as possible is absorbed and transferred via these walls 4 and the total weight of the composite structure is as low as possible.

Claims: The composite isolation structure according to the present invention retains its mechanical rigidity and strength, even at high temperatures . CLAIMS 1. Composite structure for use as isolation, comprising a thin-walled envelope for bounding a space, which space is filled with a gas with a high insulating value . 2. Composite structure as claimed in claim 1, wherein the envelope is manufactured from an organic material with a cellulose-like structure. 3. Composite structure as claimed in claim 1 or 2, wherein the material is corrugated board. 4. Composite structure as claimed in any of the foregoing claims, wherein the gas is a gas with a low coefficient of heat conduction, such as a heavy gas including krypton, freon, xenon, argon and sulphur hexane fluoride, or a thin gas. 5. Composite structure as claimed in any of the foregoing claims, wherein the space is sub-divided into various compartments. 6. Composite structure as claimed in any of the foregoing claims, wherein on the inner and/or outer side of the envelope is arranged a layer sealing the envelope. 7. Composite structure as claimed in claim 6, wherein the sealing layer is formed from aluminium foil. 8. Composite structure as claimed in claim 6 or 7, wherein the sealing layer is formed from water glass. 9. Solar energy system, comprising: - a housing comprising a part permeable by solar radiation arranged on an upper side; - a collector which is arranged in the housing and which comprises an inclining space exposed to solar radiation via the permeable part, through which space can flow a heat transfer medium which flows in a first circulation and is coupled to a second medium circuit, wherein the first circulation takes place in a circulation tank which is filled partially with liquid and partially with vapour thereof and which operates as a circulation system which is driven by natural convection of separate evaporation and condensation; - a heat storage tank which is arranged in the second medium circuit and which is thermally coupled to a wall of the circulation tank, close to a part of the first circulation which is directed downward; and - isolation arranged in the housing, characterized in that the isolation comprises the composite structure as claimed in any of the foregoing claims.

Inventors: BERTELS AUGUSTINUS WILHELMUS M, BERTELS, AUGUSTINUS, WILHELMUS, MARIA
Applicants: BERTELS AUGUSTINUS WILHELMUS M, INVENTUM B V, BERTELS, AUGUSTINUS, WILHELMUS, MARIA, INVENTUM B.V.
Application year: 2001
Main classification: F24J2
IPC codes: F16L59, F24J2