DRY LARGE-AREA SYSTEMS
In case of dry systems with a double floor pipes are placed in locking ribbons too. It is not suitable to use standard distributors here. PEX pipes of 23 or 32 dimension in Tichelman connection are used as distributors here and pressed T-shape branch pipes then connect individual system branches. Indicatively, the heating water temperature fluctuates around 65°C and the heat performance of the floor is approximately 60W/m2. However, reality always depends on the detailed arrangement. In case of distributions in double floors it is necessary to pay special attention to anchoring of pipes to the foundation outside ribbons to avoid disturbing sound effect caused by movement of pipes at temperature changes. Metal-plastic pipes are therein much better than all-plastic ones.
The REVEL Company offers a dry single-layer system in a construction depth of 30mm suitable for reconstructions with small floor heights, wood constructions or where the structural analysis does not allow loading of ceilings with concrete. The system utilizes wood-fibre boards with a thickness of 22mm of two types. The first has only longitudinal grooves with 150mm spacing, the second one is provided with milled wheels with grooves enabling rotation of random meander according to the disposition (see the photograph). The boards can be cut to obtain required shapes and are assembled using spot clamps. The assembly begins similarly to the wet systems by placing dilatations on the perimeter of the room. Temperature of the room, boards and pipes at the time of assembly is optimum above 15°C by reason of subsequent dilatation changes. The whole area of the room is assembled of boards which are connected by spot clamps. According to the needs they are hammered in random place of the heating board, which has a groove on the whole perimeter. Boards with wheels are used for the edges of the area. Since they are higher in price than filling boards it is common, that the assembly firm cuts them and uses them on both sides of the room, while the irregular cut without a groove for a clamp is turned towards the wall.
Meanders of pipes of dimension 16, and that is either metal-plastic. Dilatation of pipes and boards differs and time difference can manifest here, for example in case of quick heating-up. Protrusions in the board itself prevent displacement of pipes in turns of meanders and the danger is decreased by specific pipe waving in the groove of the board. To avoid loosening of the pipe in the meander turns, elevation of floor and subsequent pipe breakage, it is necessary to cover up the board and to screw this layer to the heating board, especially in the area of meander turns. Plasterboard with a thickness of 9mm has been proven as being the best during tests. The heating water temperature depends on the covering used, but in case of pavement it is 50°C, in case of floating floor up to 65°C. Indicatively, it can be calculated with the output of 60W/m2. This dry system was designed for floors, but it is suitable to use it also for heating walls and ceilings, including obliquities of attic. The method is similar as in case of floor, while dilatation is solved continuously between the boards. In case of walls and ceilings the plasterboard with a thickness of 9mm and subsequent common joint and surface treatment is solely used for covering. We warn that the heating boards swell in contact with water and this must be prevented. Dimensions of both types of boards are identical – 900/1350mm, it is suitable to include installation diagram of boards in the project. The thermal conductivity coefficient of the heating board material is 0.1 W/mK, the specific gravity amounts to 750 kg/m3.
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