DE202023102668U1 - Surface temperature control system - Google Patents

Abstract

surface temperature control system,
• with a carrier plate (1) which has a front (2) and a rear (3),
• and with a groove (4) running in the front face (2) of the support plate (1), the groove (4) being intended to receive a linear heating element (8),
• and with a thermally conductive foil (5) covering the front side (2) of the support plate (1) and intended to contact the heating element (8) arranged in the groove (4), characterized in that the thermally conductive foil (5 ) is provided with openings (7) which account for at least 1.5% of the area of the thermally conductive foil (5).

Description

The invention relates to a surface temperature control system according to the preamble of claim 1.

From the DE 103 41 255 A1 are known thermally conductive plates made of expanded graphite. Material thicknesses of 10 to 15 mm are considered small. A groove, which is arranged in the heat conducting plate, serves to receive a tube for the passage of a fluid heat transport medium.

From the DE 20 2014 104 262 U1 a wall heating system is known in which a graphite-containing heat-conducting layer is applied to a carrier plate. A groove is made in the thermally conductive layer and/or in the carrier plate, which serves to accommodate a heat exchanger tube. The graphite-containing heat-conducting layer can be designed as a graphite-containing heat-conducting plate or as a fine-grained or low-viscosity to liquid, graphite-containing material.

As a further development of this last-mentioned prior art is from the WO 2016/037606 A2 a wall heating system is known, which represents the generic prior art and in which the graphite-containing thermally conductive layer can also be designed as a graphite-containing thermally conductive foil, in particular as a graphite thermally conductive foil. The linear heating element can be designed as a heating pipe through which a fluid flows, or it can be designed as an electrical heating cable through which an electric current flows and which emits heat in the manner of a resistance heater. The graphite-containing heat-conducting layer can either be arranged in a groove of the carrier plate, i.e. behind the linear heating element, namely on the back of the linear heating element facing away from the room to be heated, or, after the heating element has been inserted into the groove of the carrier plate, be routed across the entire face of the backing plate so that it contacts the face of the heating element. If the heating element is designed as a pipeline, it can be used not only for heating but also for cooling by using a fluid that has been heated appropriately.

The surface facing the room to be heated is covered. The cladding can consist of a layer of plaster, tiles or natural stone slabs, depending on the desired visual and functional design of the wall surface of the room to be heated, so that the materials mentioned are only given as examples and are not exhaustive.

The object of the invention is to improve a surface temperature control system of this type in such a way that it enables the cladding to be designed as varied as possible in a simple manner and the prerequisites for an advantageous room climate are particularly easy to achieve.

This object is achieved by a surface temperature control system according to claim 1. Advantageous configurations are described in the dependent claims.

In other words, the invention proposes using a perforated thermally conductive foil that has openings that make up a total of at least 1.5% of the area of the thermally conductive foil. The invention is based on the consideration that a thermally conductive foil typically has poor adhesion properties, which applies, for example, to metallic thermally conductive foils made of aluminum or copper as well as to thermally conductive foils containing graphite, for example thermally conductive foils made of graphite, e.g. of expanded graphite. When using a thermally conductive foil made of copper, a degreased copper foil can advantageously be used, since this has improved adhesion properties and can be easily attached to the carrier plate by means of an adhesive, for example.

• Erstens ermöglichen sie ein vorteilhaftes Raumklima, indem sie nämlich die Wärmeleitfolie wasserdampfdiffusionsoffen ausgestalten, was in der Praxis kurz als „diffusionsoffen“ bezeichnet wird. Wenn die Wärmeleitfolie in einer Ausgestaltung des Flächentemperiersystems mittels eines Klebstoffs an der Trägerplatte befestigt wird, kann durch Auswahl des geeigneten Klebers und der geeigneten Trägerplatte, wenn diese nämlich jeweils selbst diffusionsoffen sind, die diffusionsoffene Ausgestaltung der Gebäudefläche gewährleistet werden, die mit dem Flächentemperiersystem versehen ist, beispielsweise ein Fußboden, eine Wand- oder Deckenfläche des Raumes.

The openings provided according to the invention make the thermally conductive foil permeable and have two different effects:

• Firstly, they enable an advantageous room climate by designing the heat-conducting foil to be open to water vapor diffusion, which in practice is referred to as "open to diffusion". If, in one embodiment of the surface temperature control system, the thermally conductive film is attached to the carrier plate by means of an adhesive, the selection of the appropriate adhesive and the suitable carrier plate, if they are each open to diffusion, can ensure that the building surface that is provided with the surface temperature control system is open to diffusion , for example a floor, wall or ceiling surface of the room.

Second, the openings allow the adhesive to pass through. Since an adhesive is used that ensures good adhesion to the thermal interface foil in coordination with the material from which the thermal interface foil is made, this adhesive represents an excellent primer on the front side of the thermal interface foil, so that the further cladding is built on this primer can, e.g. B. in the form of a clay plaster.

• • Auf die zum Raum gerichtete Oberfläche einer Trägerplatte wird Klebstoff im Überschuss aufgetragen. Im Überschuss bedeutet in diesem Zusammenhang, dass mehr Klebstoff verwendet wird, als ausschließlich zur Befestigung einer Wärmeleitfolie an der Trägerplatte erforderlich ist.
• • Anschließend wird eine Wärmeleitfolie mit ihrer Rückseite auf die Oberfläche der Trägerplatte aufgedrückt und damit in den Klebstoff eingedrückt.
• • Dabei tritt automatisch überschüssiger Klebstoff durch die Öffnungen der Wärmeleitfolie und gelangt so auf die Vorderseite der Wärmeleitfolie.
• • Der überschüssige Klebstoff wird nun auf der Vorderseite der Wärmeleitfolie verstrichen, ggf. wird zusätzlicher Klebstoff verwendet, um einen ausreichend großen Flächenanteil der Vorderseite der Wärmeleitfolie mit Klebstoff zu beschichten. Insbesondere kann die Vorderseite der Wärmeleitfolie annähernd vollflächig mit Klebstoff beschichtet werden. Die Befestigung der Wärmeleitfolie auf der Trägerplatte kann an der Baustelle erfolgen. Alternativ dazu kann sie jedoch unabhängig von der Baustelle bereits werkseitig erfolgen, beispielsweise im Herstellerwerk der Trägerplatte, so dass eine sofort einsatzbereite, verarbeitungsfähige Trägerplatte an der Baustelle bereitgestellt werden kann. Die Montage des linienförmigen Heizelements an der Trägerplatte kann zunächst erfolgt sein, bevor die Wärmeleitfolie an der Trägerplatte befestigt wird - beispielsweise wenn dies an der Baustelle erfolgt. Alternativ kann das linienförmige Heizelement in die Nuten der Trägerplatte eingeführt werden, auch wenn sich die Wärmeleitfolie bereits auf der Trägerplatte befindet. Sofern die Wärmeleitfolie nicht konturgenau auf der Oberfläche der Trägerplatte verläuft, also auch in den Nuten verläuft, wird sie verformt und in die betreffende Nut gedrückt, wenn das Heizelement in die Nut eingelegt wird.
• • Der Klebstoff stellt eine Grundierung auf der Vorderseite der Wärmeleitfolie dar, so dass später - beispielsweise nach dem Abbinden des Klebstoffs - die Verkleidung des Flächentemperiersystems montiert werden kann. Beispielsweise kann eine Putzschicht aufgetragen werden, oder Fliesen, Natursteinplatten oder dergleichen können in einer Dickbett- oder Dünnbett-Mörtel- bzw. Klebstoffschicht verlegt werden.

The design of the surface temperature control system according to the invention enables, for example, the following method in the production of a room surface to be temperature-controlled:

• • Excess adhesive is applied to the surface of a carrier board facing the room. In this context, excess means that more adhesive is used than is required just to attach a thermally conductive foil to the carrier plate.
• • Then the back of a thermally conductive foil is pressed onto the surface of the carrier plate and thus pressed into the adhesive.
• • Excess adhesive automatically escapes through the openings in the heat-conducting foil and thus ends up on the front side of the heat-conducting foil.
• • The excess adhesive is now spread on the front side of the thermally conductive foil. If necessary, additional adhesive is used to coat a sufficiently large area of the front side of the thermally conductive foil with adhesive. In particular, the front side of the thermally conductive foil can be coated with adhesive almost over its entire surface. The heat-conducting foil can be fastened to the carrier plate at the construction site. As an alternative to this, however, it can already be carried out at the factory independently of the construction site, for example in the manufacturer of the carrier board, so that a carrier board that is ready for use and can be processed immediately can be provided at the construction site. The assembly of the linear heating element on the support plate can be done before the thermally conductive film is attached to the support plate - for example, if this is done at the construction site. Alternatively, the linear heating element can be inserted into the grooves of the carrier plate, even if the heat-conducting foil is already on the carrier plate. If the thermally conductive foil does not run along the surface of the carrier plate with an exact contour, i.e. also runs in the grooves, it will be deformed and pressed into the relevant groove when the heating element is inserted into the groove.
• • The adhesive acts as a primer on the front of the thermally conductive foil, so that later - for example after the adhesive has set - the cladding of the surface temperature control system can be mounted. For example, a plaster layer can be applied, or tiles, natural stone slabs or the like can be laid in a thick-bed or thin-bed mortar or adhesive layer.

The larger the surface area of the openings in the overall surface of the thermally conductive foil, the better the openness to diffusion and the passage for the adhesive, while the performance in terms of heat radiation is reduced. In first, non-public practical tests, an area proportion of the openings that is between 2.5% and 15% and particularly advantageously 5% has proven to be advantageous.

Strictly speaking, the support plate typically has a single groove, namely when a single linear heating element is to be laid on the support plate. For example, the heating element can run in a spiral shape. Advantageously and in practice, it is laid in a serpentine or meandering pattern, so that it runs everywhere in the same plane. Nevertheless, in practice one usually speaks of a plurality of grooves which the carrier plate has, corresponding to the illustration that results from a section through the carrier plate. In such a case, the multiple grooves referred to in this way actually represent multiple sections of the same, continuous groove. Therefore, multiple grooves are also referred to below, even if the carrier plate is not designed to accommodate multiple heating elements, but only a single, continuous groove to accommodate one having a single linear heating element. In any case, the carrier plate has a plurality of grooves running next to one another—for example, parallel to one another.

In one embodiment, not a single, continuous thermally conductive foil is arranged on the front side of the carrier plate, but rather a number of individual strips of the thermally conductive foil. This offers the possibility of running a web so far over the groove that the web not only covers the groove but also protrudes beyond the groove. When the linear heating element is then inserted into the groove, the heat-conducting foil is angled down and folded into the groove. In this case, this portion of the thermally conductive film can be dimensioned so long that it bears against the heating element, which typically has a round cross section, over 180° of its cross section. This results in an excellent, intensive heat transfer from the heating element to the heat-conducting foil and thus has a positive influence on the efficiency of the surface temperature control system.

In a further development of the embodiment described above, the tracks can be dimensioned and arranged on the carrier plate in such a way that each track protrudes with its two side edges over both adjacent grooves, to the extent that two adjacent tracks of the thermally conductive film overlap over the grooves . To this In this way, the overhangs with which the webs each protrude over a groove can be dimensioned so short that the webs only have to protrude over the respective groove but not beyond it and the groove can still be lined with the heat-conducting foil over the entire surface, in favor of as much as possible extensive contact with the heating element. Since the tracks do not protrude beyond the respective adjacent groove, they do not impede the processing of the adhesive in the above-described procedure in order to distribute it on the front side of the thermally conductive film.

When using a thermally conductive foil consisting of expanded graphite, a water-glass-based adhesive has proven itself in initial tests as an adhesive, with such an adhesive also being commercially available under the name of water-glass adhesive in practice. Water glass adhesive is temperature-stable to a high degree, so that its function is guaranteed over a long period of time even under changing temperature stresses and in the face of temperature fluctuations.

Depending on the climatic conditions to which the room to be tempered is likely to be exposed, the support plate can be made of different materials. A carrier board made of natural, organic materials, for example a wood fiber board, can advantageously be used for the walls of living spaces. If there are high demands on the pressure resistance, the carrier plate can be made of foam glass, for example if the temperature control system is to serve as underfloor heating and the floor will be loaded by heavy furniture or, e.g. in industrial applications, by vehicles. If high humidity is to be expected, for example depending on geographic use or in damp rooms, the carrier board can consist of a calcium silicate material, so that it can absorb its own weight of water without structural failure and without becoming moldy.

• 1 und 2 Querschnitte durch einen Ausschnitt eines Flächentemperiersystems in unterschiedlichen Stadien seiner Montage.

An exemplary embodiment of the invention is explained in more detail below on the basis of the purely schematic representation. The show

• 1 and 2 Cross-sections through a section of a surface temperature control system in different stages of its assembly.

1 shows a cross section through a carrier plate 1, which has a front side 2 and a back side 3. FIG. The back 3 can be applied to a load-bearing surface of a building, for example laid on a screed or attached to a building wall, while the front 2 is arranged facing the room to be tempered. The front 2 is provided with a groove 4, which serves to accommodate a linear heating element. Depending on the cross-sectional geometry of the groove 4, it is intended to accommodate an electrical resistance heating cable or to accommodate a heating pipe through which, for example, water flows as a heat carrier.

On the front side 2 of the carrier plate 1, a thermally conductive foil 5 is arranged, which is designed as a foil made of expanded graphite and has a material thickness that is in the range from 0.1 to 1 mm. In order to cover the front side 2 of the carrier plate 1 , the thermally conductive foil 5 does not consist of a single cut that extends over the entire front side 2 of the carrier plate 1 . Rather are in 1 Two webs 6 of the thermally conductive foil 5 can be seen, which extend in the area of their side edges via the in 1 shown groove 4 extend and overlap over the groove 4, and which project with their respective second side edge over a groove 4, which is adjacent to the shown groove 4 and, for example, runs parallel to the shown groove 4. The thermally conductive foil 5 is provided with a large number of openings 7 .

In 2 the carrier plate 1 is shown in a state that compared to 1 represents further assembly progress. A linear heating element 8 in the form of a heating pipe has been placed in the groove 4 . The two projections with which the webs 6 protruded over the groove 4 have been bent into the groove 4 and applied to the round contour of the groove cross section.

Furthermore, in 2 an adhesive 9 can be seen, which on the one hand fixes the webs 6 of a carrier plate 1 and on the other hand has passed through the openings 7 and has been spread on the front side of the webs 6 facing towards the room in order to create a primer there.

For reasons of clarity, in 2 complete and in 1 for the support plate 1, hatching of the elements of the surface temperature control system shown in section is dispensed with.

In the illustrated embodiment, the webs 6 do not extend completely over the groove 4 with their respective overhang, as shown in FIG 1 is evident. For example, the two projections can be dimensioned in such a way that an overlap within the groove, as shown in 2 is shown is avoided. Depending on the material thickness of the thermally conductive foil 5 and the geometry of the groove 4 and the material of the carrier plate 1, and depending on how precisely the tracks 6 can be applied to the carrier plate 1 and positioned there, the tracks 6 can be cut to size that either the mentioned overlap within the groove 4 is avoided or, while accepting such an overlap, contacting of the heating element 8 over the largest possible area is ensured.

Deviating from the exemplary embodiment shown, the front side 2 of the carrier plate 1 can be covered with a single cut material of a thermally conductive foil 5 . In order to avoid having to apply this heat-conducting film 5 exactly to the topography of the front side 2, which is economically advantageous, it can span the grooves 4. Cuts are then made in the thermally conductive film 5, specifically following the course of the grooves 4, so that two overhangs of the thermally conductive film 5 are created above each groove 4, which touch one another. For example, the line of intersection can run exactly over the center of the groove 4 . However, the cutting line can also run deliberately offset from the center, so that an overhang of the thermally conductive film 5 is created, which can be folded particularly deeply into the groove 4 when the heating element 8 is inserted into the groove 4 .

Reference List

1

backing plate

2

front

3

back

4

groove

5

thermal foil

6

Train

7

opening

8th

heating element

9

adhesive

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 10341255 A1 [0002]
• DE 202014104262 U1 [0003]
• WO 2016037606 A2 [0004]

Claims (8)

Surface temperature control system, • with a support plate (1) having a front (2) and a back (3), • and with a groove (4) running in the front (2) of the support plate (1), the groove (4) intended to house a linear heating element (8), • and with a thermally conductive sheet (5) covering the front face (2) of the support plate (1) and intended to be placed in the groove (4). To contact the heating element (8), characterized in that the thermally conductive foil (5) is provided with openings (7) which make up at least 1.5% of the area of the thermally conductive foil (5). surface temperature control system claim 1 , characterized in that the openings (7) make up between 2.5% and 15% of the area of the thermally conductive foil (5). surface temperature control system claim 1 or 2 , characterized in that the thermally conductive foil (5) contains graphite, in particular as a thermally conductive foil (5) made of graphite, in particular of expanded graphite. Surface temperature control system according to one of the preceding claims, characterized in that the support plate (1) has grooves (4) running next to one another, and that individual tracks (6) of the heat-conducting foil (5) each run between the grooves (4), the tracks ( 6) each extend beyond at least one adjacent groove (4). surface temperature control system claim 4 , characterized in that two adjacent tracks (6) of the thermally conductive foil (5) overlap where they extend over the same groove (4). Surface temperature control system according to one of the preceding claims, characterized in that the thermally conductive foil (5) is attached to the carrier plate (1) with the aid of an adhesive (9). surface temperature control system claim 6 , characterized in that the adhesive (9) is designed as a water glass-based adhesive (9). surface temperature control system claim 6 or 7 , characterized in that the thermally conductive foil (5) is also coated with the adhesive (9) on its front side (2) facing away from the carrier plate (1).

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