Surface heating element and surface heating

Abstract

Surface heating element (1) for a surface heating system (10) in a building, comprising a moisture-resistant medium-density fiberboard (2), wherein at least one receiving groove (3) for receiving a heating circuit (4) of a surface heating system is formed in the fiberboard (2).

Description

[0001] The present invention relates to a surface heating element and a surface heating system with such a surface heating element.

[0002] Surface heating elements are elements of a surface heating system or a surface heating system that are integrated into walls, floors or ceilings in order to air-condition rooms in a building.

[0003] State-of-the-art panel heating elements comprise a panel made of gypsum fibers, known, for example, under the trade name Fermacell. Gypsum fiberboards in panel heating elements provide a stable, fire-resistant, and resilient surface. Heating elements are usually embedded directly into the gypsum fiberboard or housed in grooves within the gypsum fiberboard. Panel heating elements are connected either to a power grid or to a hot water system. By connecting to a cold water system, a panel heating element can also be used for room cooling. The combination of a heating element with such a gypsum fiberboard enables the integration of panel heating systems directly into walls, ceilings, or floors.

[0004] The disadvantage of heating elements made of gypsum fiberboard is that they are heavy and can break easily. They are also difficult to work with, especially when they need to be cut to size for installation. When cutting on site, an angle grinder is usually used, which wears out quickly when cutting the boards and releases large amounts of dust.

[0005] The object of the present invention is therefore to remedy at least one of the above-mentioned disadvantages and to provide a surface heating element for a surface heating system which is easier to install.

[0006] The object is achieved by a surface heating element according to claim 1 and claim 6. Advantageous developments of the surface heating element according to the invention are specified in the dependent claims.

[0007] According to the invention, a surface heating element for a surface heating system in a building is provided, wherein the surface heating element comprises a moisture-resistant medium-density fiberboard, and wherein at least one receiving groove for receiving a heating strand of a surface heating system is formed in the fiberboard.

[0008] According to the invention, a moisture-resistant medium-density fiberboard (MDF board) is used instead of a gypsum fiberboard to form a surface heating element.

[0009] Moisture-resistant means that the MDF board does not dissolve in the presence of moisture and, according to the EN 317 standard, preferably does not swell by more than 20%.

[0010] Surprisingly, a moisture-resistant medium-density fiberboard, i.e., a moisture-resistant MDF board, can be provided with grooves or milling patterns to accommodate heating elements like a conventional gypsum fiberboard and can be installed flat in walls, ceilings, and floors like a conventional gypsum fiberboard. Since the panel heating element according to the invention comprises a moisture-resistant MDF board, it can be filled, filled, or covered with water-based leveling compound without dissolving or excessively swelling. Thus, the panel heating element according to the invention is just as resistant to screed as a panel heating element with a gypsum fiberboard.

[0011] Although the panel heating element according to the invention is used essentially like a conventional panel heating element with a gypsum fiberboard, it has several advantages over conventional panel heating elements: The panel heating element according to the invention can be made much thinner than conventional ones and therefore has a significantly reduced weight and a reduced installation height. Furthermore, it offers very high stability even with a very thin layer. Despite the significantly thinner layer, a reliable integration of a heating element into the fiberboard is possible. The panel heating element can be milled and cut to size with great precision. A jigsaw can be used for cutting it to size on the construction site. This significantly reduces tool wear and dust generation.

[0012] The fiberboard of the surface heating element according to the invention has at least one receiving groove for a heating element. Even multi-part milling patterns and sets of receiving grooves can be easily formed in the fiberboard for accommodating heating elements.

[0013] Liquid-carrying pipes are particularly suitable as heating elements, but electrical heating elements can also be used.

[0014] Below are some fiberboard parameters that contributed to the particularly good properties of the panel heating element according to the invention. These features can be combined in any way to create different designs.

[0015] It is therefore advantageous if the fiberboard has a thickness swelling of less than 10%, more preferably less than 8%, according to standard EN 317. This guarantees first-class workmanship, even if the surface heating element is to be filled with a water-based leveling compound.

[0016] The fiberboard preferably has a flexural strength of 22 to 30 N / mm 2 , determined according to the EN 310 standard. This makes the surface heating element particularly durable. This is particularly advantageous for installation in the floor.

[0017] The density of the fiberboard measured according to the EN 323 standard is, for example, 790 to 840 kg / m 3 , more preferably 810 to 820 kg / mm 3 .

[0018] The fibreboard preferably has a formaldehyde content of less than or equal to 3 mg per 100 g, determined according to standard EN 120.

[0019] The surface heating element according to the invention can be attached to walls, floors, ceilings and their substructures using screws, nails or adhesive.

[0020] The object is further achieved by a surface heating element comprising a plywood panel, wherein at least one receiving groove for receiving a heating strand of a surface heating system is formed in the plywood panel.

[0021] A plywood panel can be used instead of a moisture-resistant MDF panel to construct the panel heating element according to the invention. The properties, as well as the advantages in processing and handling, are similar for an MDF panel and a plywood panel compared to a conventional panel heating element made with a gypsum fiberboard. Plywood panels tend to be even more stable than MDF panels and have higher pull-out torques for screws and nails.

[0022] In one embodiment of the invention, the at least one receiving groove has a clamping structure by means of which a heating strand inserted into the receiving groove is held / clamped in the receiving groove.

[0023] The receiving groove, for example, has a round cross-section for the precise accommodation of a tubular heating element. In this case, the maximum transverse width of the receiving groove corresponds to the outer diameter of the tubular heating element inserted therein. The receiving groove preferably also has a depth that is greater than or at least equal to its maximum transverse width. This allows a tubular heating element inserted into the receiving groove to be completely recessed into the receiving groove, so that it does not protrude from the receiving groove. The clamping structure clamps the heating element in the receiving groove, thus preventing it from falling out. The clamping structure taperes the receiving groove compared to its maximum transverse width, so that a heating element must be forced through the clamping structure when inserted into the receiving groove. A clamping structure suitable for this purpose can be implemented in various ways, e.g.through an Ω-shaped receiving groove. A heating element with a round cross-section, such as a flexible multi-layer composite pipe made of PE-RT, can be clicked, squeezed, or pushed into such an Ω-shaped receiving groove. The heating element then rests particularly securely embedded in the receiving groove. The smaller opening width of the receiving groove prevents the heating element from accidentally falling out. This design is particularly suitable for walls and ceilings.

[0024] In one embodiment of the invention, the panel heating element features a circumferential groove formed in the side surfaces. This embodiment is particularly suitable for floating installation on the floor. For example, wooden plates are inserted into the circumferential groove. Such a wooden plate can be used to connect adjacent panel heating elements that abut one another with their side surfaces, as is common in parquet flooring installations. Screwing the individual panel heating elements to the subfloor is not absolutely necessary with this type of floating installation.

[0025] The task is further solved by a surface heating system comprising: - a moisture-resistant medium-density fiberboard or a moisture-resistant laminated wood board, wherein at least one receiving groove for a heating strand is formed in the fiberboard or laminated wood board; and - at least one heating strand which is received in the at least one receiving groove.

[0026] In one embodiment of the surface heating according to the invention, the heating line is a flexible composite pipe, for example a flexible five-layer composite pipe made of PE-RT (PE = polyethylene; RT = raised temperature).

[0027] An embodiment of the invention will be described below with reference to Fig. 1 to 5 are explained in more detail. They show: Fig. 1 schematically shows a plan view of an embodiment of the surface heating element according to the invention; Fig. 2 schematically shows a side view of the surface heating element from Fig. 1; Fig. 3 schematically shows an embodiment of a receiving groove of a surface heating element according to the invention; Fig. 4 schematically shows an embodiment of a floor heating system with the surface heating element from Fig. 1 and Fig. 2; and Fig. 5 schematically shows another embodiment of a floor heating system with the surface heating element from Fig. 1 and Fig. 2.

[0028] In the Fig. 1 and Fig. Figure 2 shows an embodiment of the surface heating element 1 according to the invention. In the embodiment shown, the surface heating element 1 consists of a moisture-resistant medium-density fiberboard (MDF board).

[0029] The fiberboard is 18 mm thick, 1200 mm long and 600 mm wide.

[0030] Receiving grooves 3 for a heating strand 4 are milled into the fiberboard. The receiving grooves 3 form a milling pattern with a first set of parallel receiving grooves 31, which are crossed at right angles by a second set of parallel receiving grooves 32.

[0031] The milling pattern has bends 33 between the second set 32 ​​and the first set 31. Along these bends 33, a heating line 4 can be guided from the second set 32 ​​into the first set 31. The milling pattern further includes milled circular arcs 34 along which a heating line 4 can be redirected to be laid in a meandering pattern along the first set 31.

[0032] As in Fig. 3, the receiving grooves 3 in the embodiment shown are Ω-shaped and have a round cross-section. The minimum opening width of the receiving groove 3 is smaller than the maximum transverse width of the receiving groove 3 due to the clamping structure 5. This allows a heating strand 4 to be clicked into the receiving groove 3. The receiving groove 3 is sufficiently deep so that the heating strand 4 is completely sunk into the receiving groove 3 and does not protrude above the surface of the surface heating element 1. In other words, the depth of the receiving groove 3 is greater than the diameter of the heating strand 4. The clamping structure 5 protrudes on opposite sides of the receiving groove 3 on the side wall thereof. The clamping structure 5 tapers the transverse width of the receiving groove 3 and thus clamps the inserted heating strand 4 in the receiving groove.The clamping structure 5 can be formed by a suitable milling head directly when milling out the receiving groove 3 from the fiberboard / plywood panel 2.

[0033] Fig. Figure 4 shows an underfloor heating system 10 with an MDF board as the surface heating element 2, which is mounted on an old floorboard as a substructure 6. The MDF boards 2 are either screwed to the substructure 6 or they are installed floating.

[0034] In the embodiment shown, the MDF board 2 is insulated from the wall with a 5 mm thick and 100 mm high edge insulation strip 8 made of polyethylene.

[0035] In the illustrated embodiment, a flexible five-layer composite pipe made of PE-RT with a diameter of 12 mm serves as heating line 4. Starting from a heating circuit manifold, the composite pipe is introduced from above into the first set of receiving grooves 31 and guided in a meandering pattern through the MDF board 2 via the circular arcs 34.

[0036] The receiving grooves 3 are filled with leveling compound and lined with a top layer 7.

[0037] Suitable floor coverings include parquet, laminate, vinyl, carpet or ceramic flooring (tiles).

[0038] If, as in Fig. If, as shown in Figure 5, a ceramic surface covering 7 is to be installed, an additional decoupling layer 9 can be arranged between the MDF board 2 filled with leveling compound and the tiles of the surface covering 7. For example, a decoupling board or a decoupling mat can be used as the decoupling layer 9.

[0039] Instead of a moisture-resistant MDF board, a plywood board can also be used. List of reference symbols 1 surface heating element 2 fiberboard / plywood board 3 mounting groove 31 first set of receiving grooves 32 second set of receiving grooves 33 turns 34 circular arcs 4 heating circuits 5 clamping structure 6 Substructure 7 Surface 8 edge insulation strips 9 Decoupling layer 10 Surface heating

Claims

[1] Surface heating element (1) for a surface heating system (10) in a building, comprising a moisture-resistant medium-density fiberboard (2), wherein at least one receiving groove (3) for receiving a heating strand (4) of a surface heating system is formed in the fiberboard (2). [2] Surface heating element according to claim 1, characterized by that the fiberboard (2) has a thickness swelling according to standard EN 317 of less than 10%, more preferably less than 8%. [3] Surface heating element according to claim 1 or 2, characterized by that the fiberboard (2) has a bending strength of 22 to 30 N / mm 2 determined according to standard EN 310. [4] Surface heating element according to one of the preceding claims, characterized by that a density of the fiberboard (2) 790 to 840 kg / m 3 , more preferably 810 to 820 kg / mm 3 , measured according to EN 323. [5] Surface heating element according to one of the preceding claims, characterized by that the fibreboard (2) has a formaldehyde content of less than or equal to 3 mg per 100 g, determined according to standard EN 120. [6] Surface heating element for surface heating in a building, comprising a moisture-resistant plywood panel (2), wherein at least one receiving groove (3) for receiving a heating strand (4) of a surface heating system is formed in the plywood panel (2). [7] Surface heating element according to one of the preceding claims, characterized by that in the at least one receiving groove (3) there is a clamping structure (5) by means of which a heating strand (4) inserted into the receiving groove (3) is held / clamped in the receiving groove (3). [8] Surface heating element according to one of the preceding claims, characterized by that the surface heating element (1) has a circumferential groove formed in the side surfaces. [9] Surface heating (10), comprising: - a surface heating element (1) according to one of claims 1 to 8, and - at least one heating strand (4) which is accommodated in the receiving groove (3). [10] Surface heating according to claim 9, characterized by that the heating line (4) is a flexible composite pipe.

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