Method for producing an underfloor heating surface as a "circle in circle" system with crossing and method for operating such an underfloor heating system

Abstract

Method for producing an underfloor heating surface, characterized in that a.) a previously desired laying distance of the pipe for an underfloor heating system is doubled in the spiral-shaped installation and b.) taking into account the permissible circle length over the area in a spiral shape, then c.) a second underfloor heating circuit is installed in the space created between the flow and return of the installed circuit and d.) this crosses the pipeline in the area of ​​the middle of the first laid circle, so that a “circle in circle” laying is created.

Description

[0001] The invention relates to a method for producing an underfloor heating surface as a “circle in circle” system with crossing and to a method for operating such an underfloor heating system.

[0002] The invention proposes the creation of a quickly controllable underfloor heating system using a new installation technique and operating method. This new operating method and installation method, "circle in circle with intersection - Stadler system," utilizes a special pipe installation plate to not only minimize the inertia of the underfloor heating system and ensure faster heating, but also optimize comfort in the room being heated and significantly improve the heating performance of the heater.

[0003] The general state of the art is as follows: Underfloor heating is often used to heat all types of buildings.

[0004] For example, CH 695 627 A5 discloses a hollow body arrangement for the surface exchange of heat, comprising at least one hollow body that can be configured to form a sheet-like structure. The individual hollow body or individual hollow body sections are spaced apart from one another by spacers, and the spacers are provided in the form of a metal mesh constructed in the manner of a diagonal mesh, into which one or more hollow bodies are inserted. DE 32 48 488 A1 discloses a method for producing a rigid foam panel with grooves formed in the panel's upper surface for accommodating pipes for an underfloor heating system.

[0005] Underfloor heating achieves an exceptionally high level of comfort for the people in the room by means of a relatively low surface temperature and a relatively large area (floor area of ​​the room to be heated).

[0006] Due to the resulting very low flow temperature of the underfloor heating, this type of surface heating is ideal for heating systems that benefit from low return temperatures. For example, gas condensing boilers can only utilize the available condensation energy from the flue gas at return temperatures below approximately 43°C.

[0007] More important, however, is the use of a heat pump. A heat pump extracts energy from the environment (e.g., air or ground) and converts it to a higher level using electrical energy. The efficiency of the heat pump depends solely on the difference (the delta T) between the ambient temperature and the temperature at which the radiant heating system operates.

[0008] Since the current Energy Saving Ordinance (EnEV) came into force, heat loss from the building is very well shielded from the outside air, the ground, or rooms with significantly lower interior temperatures. The underfloor heating output per square meter can therefore be very low, and the floor surface temperature can be well below the maximum permissible value of 29°C (according to DIN EN 12831) in the occupied zone. The surface temperature currently lies between approximately 21°C and 24°C in the design state (at the lowest expected outside temperature at the construction site, as applicable according to DIN EN 12831).

[0009] The large mass of the load distribution layer (e.g. screed) results in a large storage capacity, which partly has the positive effect of being able to manage for a longer period without reheating in terms of heat dissipation and allowing an early reduction of the temperature for subsequent lowering.

[0010] The negative effect is then more serious. Since the building or room requires only a very small amount of heat to heat the room to the desired room temperature of, for example, 20°C due to the excellent shielding against heat loss, the inflow of external energy becomes increasingly crucial. One example is the external energy source "solar radiation." Due to solar radiation, which enters through the windows, for example, it is possible for the room to reach its desired temperature through this form of external energy alone, even at outside temperatures of -5°C or higher.

[0011] Due to the room temperature control prescribed by the Energy Saving Ordinance (EnEV) in the version valid at the time of registration, this is usually achieved using a thermostat located in the room to be controlled and an actuator (which operates a valve). The thermostat senses the room temperature, opens when required, and releases the heat flow via the actuator. When the room temperature has reached its setpoint, the thermostat closes the heat supply. It does this until the desired room temperature is not reached again. If, for example, this value is not undercut between 10 a.m. and 5 p.m., the load distribution layer (screed) experiences considerable heat loss due to the natural radiation or conduction of heat to the area underneath (e.g. basement, soil or outside air), even with good insulation, and thus a temperature that can be well below room temperature.The room thermostat doesn't react to this, as it only senses the existing room temperature. If, due to the loss of this external energy (sun behind clouds or similar scenarios), the room needs heat quickly to reach the desired room temperature, this can sometimes take hours due to the large mass to be heated. This control option is currently installed and used in almost all cases.

[0012] It is currently not possible to reduce the inertia of the load distribution layer in an underfloor heating system in a cost-neutral and effective manner.

[0013] The object of the invention is to develop a quickly adjustable underfloor heating system that can be installed at no additional cost, achieving the greatest possible effectiveness in accordance with the Energy Saving Ordinance (EnEV) and ensuring the comfort of the occupants in the room. This object is achieved by the subject matter of independent patent claims 1 and 2. For this purpose, the installation methods used must be briefly discussed.

[0014] The almost always used bifilar (spiral) installation of underfloor heating pipes (Figure 1) will require one or more circuits for a room, depending on its size. With the spiral installation of underfloor heating pipes, a theoretically equal temperature is achieved on the surface, since the heating medium temperature of the supply and return water is the same at every point (Figure 2). These individual circuits are often divided across the room area, also taking into account any expansion joints in the load distribution layer. Especially for living rooms, which generally have sizes over 25 square meters, at least two circuits are often located in the living area (Figure 3).

[0015] Therefore, a new installation system is required to compensate for the disadvantages described:

[0016] Instead of laying these two circuits next to each other, they are designed according to claim 1 as a "circle in circle with intersection - Stadler system" (Figure 4a / 4b / 4c). One circuit is therefore laid out in the entire room with twice the pipe spacing, so that the second circuit can be laid inside the first circuit. In order to achieve the same pipe spacing, the pipes are crossed in the middle of the room, preferably (in the case of a reversing loop). Now, however, according to claim 2, only one circuit is connected to the room thermostat. The "unconnected circuit" is continuously supplied with heat by the weather-compensated control system at the temperature set (according to a curve) for the respective outside temperature. The pipe spacing could be 10 cm, for example. This would result in a spacing of 10 cm across the entire area if both circuits were heated. The spacing between the pipes can be determined if necessary.about the previously calculated heating load that this room requires in order to heat it according to DIN EN 12831. Consequently, the required spacing of the pipes could also be different. The only important thing here is that the new installation method "Circle in circle with intersection - Stadler system" preferably results in twice the spacing over the entire area if only one circuit is heated. If the room is larger and more than 2 circuits have to be installed, it is possible to install the "Circle in circle with intersection - Stadler system" with 4 or more times as many circuits. In this case, however, only one circuit of the individual "Circle in circle with intersection - Stadler system" is connected to the thermostat at a time.

[0017] If the solar heat input occurs, as described above, the thermostat will only shut down one circuit of the system. As a result, the circuit not controlled by the thermostat will now receive half the power (needed for the room) due to the now larger pipe spacing, namely 20 cm in the example. This prevents the load distribution layer from cooling down and maintains a temperature similar to room temperature.

[0018] An increase in room temperature is unlikely to occur due to the heating circuit remaining in operation, as heat dissipation from the floor surface can only occur at a lower temperature level. Thus, the screed remains at a barely perceptible operating temperature and, when heat is later requested (by the room thermostat), is supplied with heat via the second circuit. Since the temperature increase of the floor surface is now only approximately 1-2°C (normally approximately 4-6°C), rapid control of the underfloor heating system is achieved, comparable to the rapid temperature increase achieved by a radiator.

[0019] This special type of installation for underfloor heating offers several additional advantages. By preventing the floor from cooling down, people wearing socks or walking barefoot can move across the floor surfaces without compromising comfort.

[0020] This means that small children no longer have to lie on relatively cold floors (sometimes 15-16°C if the room borders on ground-level surfaces), even when the target room temperature has been reached. Consistently excellent comfort is achieved even during the so-called transitional seasons.

[0021] Especially when heating a building with a heat pump, this "circle-in-circle with intersection - Stadler System" installation technique even leads to cost reductions. Currently, it is not possible to completely reduce the heating load demand with a heat pump. Every heat pump requires a buffer or storage tank to temporarily store the excess output, as the heat pump has a higher power consumption when it "starts up" to meet a demand.

[0022] Therefore, care is taken to ensure that once it is running, it continues to produce heat, ideally for a longer period of time. This is normally ensured by intermediate storage of the heat in a storage tank. In the "Circle in circle with intersection - Stadler system", the load distribution layer acts as a heat storage unit. For a living room area of, for example, 35 square meters, this results in approximately 2.3 cubic meters of screed, which can then fulfil the task of storage and continuously release the heat. A different type of load distribution layer (e.g. cement screed, flow screed or dry screed) would have no influence on the functionality of the new "Circle in circle with intersection - Stadler system".

[0023] Depending on the size of the heat pump, a buffer storage tank may be unnecessary.

[0024] After all this, the method according to the invention for producing an underfloor heating surface is characterized in that a.) the previously desired laying distance of the pipe for the underfloor heating is doubled in the spiral-shaped installation and b.) taking into account the permissible circle length over the area in a spiral shape (Figure 4a), then c.) the second underfloor heating circuit to be installed is laid in the space created between the flow and return of the installed circuit (Figure 4b) and d.) this crosses the pipeline in the area of ​​the middle of the first laid circle, so that a “circle in circle” laying is created (Figure 4c).

[0025] Furthermore, the method according to the invention for operating a “circle in circle” underfloor heating system is characterized in that a.) a first of the installed underfloor heating circuits of the “circle in circle” installation is connected to a room temperature control device, and b.) this first circuit is adjusted to the room temperature target and thus influenced depending on the room temperature and c.) a second of the installed underfloor heating circuits of the “circle in circle” installation does not regulate the room temperature, but d.) this second circuit is influenced by a weather-dependent control system, that e.) this second circuit is permanently supplied with heat depending on the outside temperature and experiences a significantly reduced output than that calculated or desired for the entire area to be heated.

[0026] To use the “Circle in circle with intersection - Stadler system” method, a prefabricated insulation board is preferably required.

[0027] The intersection of the pipes, preferably in the center of the room, is achieved using an insulation panel, which may have one or more integrated grooves to accommodate the underfloor heating pipe in the existing insulation layer. This panel can be inserted after the piping has been installed. It may be advantageous for the underfloor heating installer to insert the prefabricated panel, which can be square, rectangular, or another shape, into the existing insulation layer and then insert the underfloor heating pipe into it. The pipe located above the insulation layer should preferably be fixed to the insulation using currently available fastening methods to prevent the lower pipe from being lifted. The dimension of the underfloor heating pipe can be freely selected and does not affect the functionality of the new "circle within a circle with intersection - Stadler system."

Claims

[1] Method for producing an underfloor heating surface, characterized in that a.) a previously desired pipe spacing for underfloor heating is doubled in the case of spiral laying and b.) if, taking into account the permissible circle length, the area is laid out in a spiral shape, then c.) a second underfloor heating circuit to be laid is laid in the resulting space between the flow and return pipes of the installed circuit and d.) this crosses the pipeline in the area of ​​the middle of the first laid circle, so that a “circle within a circle” laying is created. [2] Method for operating a “circle in circle” underfloor heating system, characterized in that a.) The first of the installed underfloor heating circuits of the "circle in circle" installation is connected to a room temperature control device, and b.) this first circuit is balanced with the room setpoint temperature, and is therefore influenced by the room temperature and c.) a second of the installed underfloor heating circuits, the "circle within a circle" installation, is not regulated via the room temperature, but d.) this second circuit is influenced by a weather-compensated control system, that e.) this second circuit is permanently supplied with heat depending on the outside temperature and f.) experiences a significantly reduced performance than calculated or desired for the total area to be heated.

Images