DE102005012064A1 - Heat insulating unit for use in building cover, has continuous bars displacing parallel to theoretical optimal isotherms for extension of heat transfer path, where insulating unit is used in form of lamellae for temporal protection - Google Patents

Abstract

The insulating unit has continuous bars displacing parallel to the theoretical optimal isotherms for extension of a heat transfer path. The insulating unit is used in form of lamellae for temporal protection. An evacuation of an appropriate insulating material e.g. aero-gel granule and silicic acid, and the gas-tight formation of the lamellae structure carry further optimization.

Description

The Invention relates to the principle of forming heat-insulating elements in such a way that the internal structure with respect to the theoretically optimal isothermal course with the aim of maximum thermal insulation is optimized.

isothermal identify the real temperature profile in the component. At the same time, heat always flows across to the isotherms, while parallel to this in the balance no heat transfer takes place.

The The principle described here is based on the component structure constructive structure so that the uncritical for the heat transfer webs (parallel to the theoretically optimal isotherms) are arranged while the transverse ones as possible maximum offset to maximize the path of heat transfer. The same principle is also applied to the rule push of the element and leads therefore for If necessary, this area is a modification of the element structure.

This Here is the example of a heat-insulating Lamella using high performance insulation such as e.g. Aerogels and / or Vacuum insulation systems shown, the movable outside in front of the building envelope for Purposes of temporary thermal protection can be used. Such elements can be translucent or opaque be.

It is known to be mobile in front of the façade elements such as shutters or blinds a certain temporary heat protection Offer by placing between facade (for example with window) and shop form a largely closed airspace and thereby the convection reduce.

Of the targeted use of highly thermally insulated elements elevated this effect many times over, so by optimizing the connections greater tightness and thus even lower convection is allowed. Especially will but so also the heat conduction and (with radiopaque Execution) thermal radiation and secondary radiation almost complete prevented.

Basically, too all kinds of rolling, folding, sliding shutters and the like as well like fixed elements that are on a similar structure be developed or modified according to the invention.

Of the However, use of such high-performance systems in slats offers a number of advantages over the use in folding or blinds or the like, which make sense, this invention to explain it by way of example. in principle are the aforementioned relationships but almost without exception also for other forms and elements are valid which are developed according to the same principles.

1.1. Exemplary application

Left out the building envelope, in particular ago Areas with openings, are arranged movable elements that are equipped with high performance thermal insulation could be. Grant in open condition they radiation passage, Air exchange and outlook. When closed, they form one preferably homogeneous closed thermal parting line, which is translucent or opaque can be trained.

These Facility for temporary heat protection will be explained below by way of example on a lamella construction.

there follows the illustrated outer shape known conventional fins, which are generally used for solar and / or glare protection and / or daylight steering are optimized. Naturally this can be adapted to the respective requirements. A meaningful provision the shape is as well dependent by the length, the thickness and the distance of the lamellae, the material used, here in particular of its reflection and absorption properties, from the statics, the expected external conditions, etc.

The lamella can consist of an extrusion profile which forms chambers through webs, which can additionally absorb thermal insulation material. The webs are just arranged so that the above-explained principle is used, see 1a + 1b , The planned - here movable - impact of the slats also leads to a modification of the edge region, which leads to a situation optimized with regard to the heat transfer, see 2 and 3 (Isothermal).

1.2. Heat-insulating core

The temporary thermal insulation system lamella can additionally have a core made of open-celled, porous and thus evacuatable insulation material, which can be translucent or opaque, see f in 1a + 1b , For example, microporous silica powders or aerogels which heat in a pressure range between 1 and 10 mbar can be used suitably conductivity between 4 and 10 mW / mK.

1.3. shell

The Profile material can be translucent or opaque be. Suitable materials are for example polycarbonate (PC) or polyester (PET). Gas tightness can be increased by additional High barrier films or by suitable coatings or by the use of additional, suitable polymers can be achieved.

1.4. overlap

In order to avoid thermal bridges in the area of impact with closed lamellas, it makes sense to overlap them, see 2 and 3 , At this point, an additional profile could be attached, that the sealing effect further improved.

1.5. Translucent and opaque slats

in the Meaning of broadening the range of use of the developed temporary thermal protection can translucent and opaque Variants are applied.

Translucent variants to lead to radiation entry into the building interior even when closed, thus promoting the so-called greenhouse effect. This can be used to generate solar profits. Overheating in the summer case is to be countered by suitable measures. Besides, they are such lamellae depending on the degree of light transmission as a shading system opaque Prefer variants because they lower the luminance contrast and thus lead to less glare can. They usually also reduce the need for artificial lighting, since themselves in the event of shading with complete closed lamellae still sufficient light, e.g. to work in the building interior can get.

1.6. Applications in general

The Slats are particularly interesting for another reason: By the highly effective insulation in the lamellae, the effect of the so-called secondary radiation greatly reduced. If the slats are used as sun protection, warms up the sun facing side by absorption strong. By the insulation in the lamella prevents this heated material the energy on the back in the form of heat radiation emits in the interior, as with conventional, not thermally insulated slats to a great extent the case is.

This makes the invention especially in hot latitudes with high Day / night temperature contrasts interesting, because in addition to the meaningful application at night as described above, the application during the day too Significant gains in use compared to conventional slats leads.

2. Possible applications (examples)

The thermal insulation Slats could in continuation of the thermal parting line in a mullion-transom façade be used. Behind it could a window can be arranged. For ventilation purposes are slats and windows open. The slats serve as shading and light-guiding elements. Depending on the degree of translucence can They are also used as a glare protection. Especially in cold winter nights The closed louvers can cause the building to cool down be reduced.

The thermal insulation Slats could as well in the form of a second-skin facade in front of a conventional fully glazed Facade to be arranged. Behind this, openings could be provided. For ventilation purposes slats and windows are opened. The opening degree the slats determines the air supply into the façade gap and depending on the degree of translucency also the measure for the outlook. The slats serve as shading and light-guiding elements. Depending on the degree of translucence can They are also used as a glare protection. Especially in cold winter nights The closed louvers can cause the building to cool down be reduced.

The thermal insulation Slats could as well in continuation of the thermal parting line in a mullion-transom façade be used. For ventilation purposes the slats are opened. The slats serve by the nature of their arrangement in the lower and Skylight area as a very effective and finely adjusted ventilation or outlets. This can (depending on the cleaning option) on opening wings in the window area be waived.

Claims (8)

Principle of the formation of a heat-insulating element, characterized by the optimized with regard to the isothermal course formation of the internal structure: uninterrupted webs (eg a in 1a + 1b ) as completely as possible parallel to the theoretically optimal isotherms, transverse to it (eg b in 1a + 1b ) maximally offset as possible to extend the heat transfer path. A claim 1 corresponding application in the form of Fins as described, e.g. for temporary heat protection. A claim 1 corresponding application in the form of moving shops, such as. Folding, sliding or roller shutters. A claim 1 corresponding application in the form of individual elements to be mounted firmly, e.g. plate-shaped. An application according to any one of claims 1 to 4 in transparent, translucent or opaque design. An application according to any one of claims 1 to 5, wherein the use of additional insulating material (eg airgel granules, silica etc., eg f in 1a + 1b ) in the chambers brings further optimization (vacuum insulation system). A claim 6 corresponding application in which the Evacuation of a suitable insulating material and the gas-tight formation of the lamellar structure further optimization brings. An application corresponding to any of claims 1 to 7, at the additional Coatings on the surface other properties, e.g. optimized light control, shading, Filtering out certain spectral regions of the light, improved gas-tightness etc. bring.