DE29517390U1 - Device for transparent thermal insulation - Google Patents

Abstract

The device includes at least two double or multiple web panels. The latter may have thin transparent walls which are connected by a separated mesh. The web panels are combined into a unit using a common mounting, and at least one triple or quadruple web panel may be inserted as a multiple web panel. The mounting may be in the form of a wooden frame with wooden strips to act as spacers between the web panels. Metal profiles can also be used for the mounting. The use of web spacings of 3 to 80 mm, and flange spacings of 6 to 60 mm, and with both webs and flanges made from material with a thickness of 0.2 to 3 mm, is also discussed.

Description

DESCRIPTION
Field of the invention

The invention relates to a device for transparent thermal insulation, consisting of a combination of at least two double-wall or multi-wall panels.

State of the art

"Translucent cover or wall panels made of thermoplastic material with two thin outer walls forming the outer surfaces of the panels and numerous distribution partitions that connect the outer walls in one piece and are arranged in a grid or half-timbered manner in cross-section" have been known since 1970 (DE-A 16 09 777; DE-Gbm R 30 956, class 39A). The so-called double-webbed or multi-webbed panels characterized in this way have achieved considerable practical importance as glazing elements, particularly in greenhouse construction, conservatories, sports halls, etc. They consist mainly of polymethyl methacrylate, polycarbonate or polyvinyl chloride. In the meantime, additional suggestions have been made for the appropriate design of the double-webbed or multiple-webbed panels and their fastening (cf. DE-A 29 13 074; DE-A 31 08 711; DE-A 32 44 953), including numerous suggestions concerning the geometry of the webs (cf. US-P 3,741,857, EP-A 0 054 856, DE-Gbm 80 27 441; EP-A 0 283 071; EP-A 0 381 339). The extrusion process has proven to be effective for the production of the double-webbed or multiple-webbed panels (cf. BE-A 638 716; DE-Gbm 89 15 137; DE-Gbm 90 14 968.8).

Task and solution

State-of-the-art double-wall and multi-wall panels owe their market position primarily to their excellent thermal insulation, high light transmission and high rigidity, while having a relatively low weight.

Nevertheless, improving thermal insulation while maintaining as much light transmission as possible is seen as a task. The trend is towards changing the structure of the individual double-webbed or multi-webbed panel. For example, EP-A 0 286 003 proposes a hollow chamber panel in whose cavities at least two "roof-shaped" inner belts are arranged.

However, hollow chamber panels with a special web geometry require corresponding manufacturing processes with special tools, which are only really worthwhile for larger quantities. Other ways should therefore be sought to improve the transparent thermal insulation beyond the level achieved with the commercial forms of double-web and multi-web panels.
The combination of two or more double-wall or multi-wall plates in one device has proven to be a cost-effective and effective solution to the problem. At least two of the hollow chamber plates mentioned are combined in a common holder.

Preferably, the hollow chamber panels are made of the commonly used transparent plastics, especially thermoplastics. These include polymethyl methacrylate or copolymers of

Methyl methacrylate, polycarbonate, polystyrene, PETG. The main area of application is thermal insulation on buildings, especially on facades.

Preferably, commercially available double-webbed or multi-webbed panels are used, especially those with webs running perpendicular to the surface of the belt, but hollow chamber panels with a different web geometry, e.g. so-called half-timbered geometry, can also be used (see "State of the art" above). Furthermore, the dimensions known from typical glazing applications and proven in practice, such as the width and thickness of the double-webbed or multi-webbed panels, can generally be adopted.

The following data can be used for common double-wall or multi-wall panels:

- Double-webbed sheets, triple-webbed sheets, quadruple-webbed sheets

- Belt spacing 6-60 mm, preferably 16-32 mm,

- web spacing 3-80 mm, preferably 16-64 mm,

- Belt thickness 0.2 - 3 mm

- Bar thickness 0.2 - 3 mm

The dimensions are coordinated in the usual way; for example, triple web panels with a distance between the outer flanges of 32 mm, web distance: 32 mm, distance upper flange-middle flange: 16 mm, flange thickness: 1.9 mm, web thickness: 1.0 mm can be used.

Of course, advantageous embodiments of the prior art can be used in the devices according to the invention. In particular, weatherproof, particularly UV-protected or surface-protected embodiments (cf. DE-A 45 76 870 and DE-A 32 44 953) and, if necessary, coloring should be considered.

The thermal insulation can be adapted to the respective situation through various combinations. For example, external, e.g. directly exposed to the weather, and internal multi-wall panels can differ. The external multi-wall panel can, for example, be more stable (higher weight per unit area) and/or have a surface finish. The combination of multi-wall panels made of different materials, e.g. a high-quality external and a lower-quality internal multi-wall panel, also appears to be appropriate in some cases. The inventive combination of at least two multi-wall panels can be present from the outset in a suitable composite adapted to the intended purpose and location, but it can also be manufactured at the location of use, for example on the facade itself.

With regard to the required frame elements, there are various options, mainly determined by the specific application.
In particular, practical post-and-beam combinations are possible, e.g. made of metal or plastic profiles, especially aluminum profiles, through to simple slatted constructions. The frame elements are usually located on

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at least two, preferably on opposite sides of the combined web panels. For example, two conventional profile rungs can be combined, e.g. by joining, gluing, screwing, etc.

Beneficial effects

The device according to the invention, consisting of a combination of two or more double-wall or multi-wall panels, enables cost-effective and effective thermal insulation. The proposed combination offers very good heat transfer coefficients (k-values) with high transparency at the same time. By varying the combination, the thermal insulation can be adapted to the respective situation. By using a suitable combination, the k-value can be reduced to a value of < 1.0 W/m ² k, as shown in the following examples.

The following examples serve to illustrate the invention:

EXAMPLES

The following combinations were built using wooden frames in which wooden strips serve as spacers between the web panels. The k-value measurements were carried out using an Ahlborn type 2287-8 k-value measuring device. The samples were placed in the door of a climate cabinet. The outside temperature was 23 degrees C, the inside temperature 4-10 degrees C. The heat transfer coefficients used were aj _nnen = 8.1 W/m ² .k and a _au ß _en = 23.3 W/m ² .k.

example 1

Combination of 3 triple-wall panels (PLEXIGLAS triple-wall panels S3P 32/1230-32) Web spacing: 32 mm. Distance between outer chords: 32 mm. Distance between upper chord and middle chord: 26 mm. Air gap between the triple-wall panels: 3 mm each. k-value: 0.84 W/m ² .k (for comparison, an S3P 32 alone: k = 2.1 W/m ² .k).

Example 2

Combination of 3 quadruple web panels (MAKROLON quadruple web panels S4P 25/980-25 HR). Web spacing: 20 mm. Distance between outer chords: 25 mm. Distance between upper chord and middle chord: 8 mm. Air gap between the web panels: 14 mm. k-value: 0.99 W/m ² .k (for comparison, an S4P 25 alone: k= 1.7 W/m ² k).

Example 3

Combination of 5 double-wall sheets PLEXIGLAS SDP 16/980-64 ALLTOP). Web spacing: 64 mm. Belt spacing: 16 mm. Air gap between the web sheets: 10 mm. k-value: 0.76 W/m ² .k (for comparison, one web sheet alone: k = 1.9 W/m ² .k).

Alternatively, metal or plastic profiles can be used as support elements for the multi-wall panels.

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Claims (6)

PROTECTION CLAIMS 1. Device for transparent thermal insulation using double-wall and multi-wall panels, characterized, that at least two double-webbed or multi-webbed panels are combined into one unit using a common bracket. 2. Device according to claim 1, characterized in that at least one triple-webbed plate is used as the multi-webbed plate. 3. Device according to claim 1, characterized in that at least one quadruple web plate is used as the multi-web plate. 4. Device according to claim 1, characterized in that the k-value of the double-webbed or multi-webbed panels combined to form a unit is below 1.2 W/m ² .k. 5. Device according to claims 1-4, characterized in that the holder consists of a wooden frame with wooden strips as spacers between the web plates. · ■ · a* 6. Device according to claims 1 - 4, characterized in that metal profiles were used for the mounting.