AT515273B1 - System for controlling the drying phase of concrete screed provided with underfloor heating - Google Patents

Abstract

In a system for controlling the drying phase of concrete screed (1) provided with underfloor heating (2) comprising a heating circuit with flow temperature in a building, sensors (6) are measured in the concrete screed (1) at a predetermined depth for measuring the temperature occurring In addition, at least one window (11) or an opening of the building, a ventilation fan (13) is used, wherein the sensors (6) in the concrete screed (1) and the ventilation fan (13) to a Central control unit (10) are connected, by means of which in a first period until reaching a predetermined minimum humidity of the concrete screed (1) of the ventilation fan (13) is switched on and off according to a predetermined circuit diagram. In a subsequent second period of time the ventilation fan (13) is then no longer activated and controlled by the central control unit (10) the flow temperature in the heating circuit of the floor heating (2) as a function of time after a predetermined Ausheizkurve (16).

Description

Description: The invention relates to an arrangement for drying concrete screed of a screed provided with underfloor heating, which comprises a heating circuit with flow temperature, in a building.

When building structures, the drying behavior of the screed does not always behave the same during its drying phase, but is influenced by the outside climate and the ventilation behavior used.

It may be when z. B. too strong drafts are used and therefore there is too rapid drying, damage to the screed or, if there is insufficient ventilation, damage to the construction by condensation on windows or wall surfaces and this subsequently Mold can result.

[0004] DE 102013009150 A1 [Aumiller, 2013] discloses a drying method for a screed, wherein moisture sensors are provided in the floor, and when a predefined moisture level is exceeded, an exhaust air unit is activated which releases the moisture to the outside environment. Furthermore, from the prior art, for example DE 20308734 U1 [Sued West GmbH, 2013], US2005285748 A1 [Gavrilovich et. al .; 2005], EP 2498036 A2 [Lynch, et. al .; 2012] and US 2010319296 A1 [Trotter; 2010], a variety of different drying devices known.

[0005] For the drying phase of the screed, agents are usually used to carry out measurements with individual samples and then appropriate ventilation is carried out. However, this is relatively complex and, since only uncoordinated individual measurements are carried out, does not lead to a continuous, traceable drying process, and the drying time cannot be determined almost exactly. The ventilation is done by opening one or more windows by an operator, who has to wait for the opening time until the window closes, which is not very economical, especially not for larger construction projects such as residential complexes or row house projects for developers.

To remedy this problem, the invention has for its object to provide a system for controlling the drying phase of screed concrete provided with underfloor heating in buildings, which allows a continuous drying process and correct drying with good timing and economic feasibility.

According to the invention, this is achieved by the following measures, in which a floor heating connected to a heating system with a heating circuit with flow temperature is attached in the concrete screed, with a ventilator that can be mounted in a window or an opening of the building, with the same in the concrete screed at a predetermined depth attached sensors for measuring the moisture of the concrete screed, and with a central control unit to which the ventilation fan, the heating system and the sensors (6) are connected, the control unit being designed in such a way that it is dependent on the moisture measured by the sensors Concrete screed switches the ventilation fan on and off in accordance with a specified circuit diagram until a minimum moisture value of the concrete screed is reached, switches off the ventilation fan when the minimum moisture value in the concrete screed is reached and then during an off heating phase via the heating system controls the flow temperature in the heating circuit of the underfloor heating according to a predetermined heating curve.

When using the arrangement according to the invention, it becomes possible to achieve optimum drying of the concrete screed and at the same time to avoid damage to the screed or to the building construction. When using the arrangement according to the invention, a very good determination of the drying time with a continuous drying process can take place, with no complex individual measurements with local sampling being required. The ventilation takes place automatically via a control unit, so that / 9

AT515 273 B1 2018-02-15 Austrian patent office also completely eliminates the special use of employees and operators to open and close windows for room ventilation. By automatically controlling the flow temperature in the heating circuit of the underfloor heating (by controlling the associated heating system by the central control unit) according to a predetermined heating curve, the drying system according to the invention can achieve a very good drying result overall.

The use of a plurality of sensors embedded in the concrete screed for measuring the temperature and humidity occurring there creates the possibility of a plurality of individual values of the various sensors measured in the concrete screed, all of which are attached at a predetermined depth in the concrete screed and thus provide comparable measured values to determine an average measured value that corresponds to the current temperature and moisture status of the concrete screed.

The circuit diagram that is used for switching the ventilation fan on and off is determined on the basis of empirical values which have resulted from the ventilation of the concrete screed in its drying phase as being effective. The given circuit diagram can be flexibly specified in a wide range. B. once a day with a running time of the ventilation fan of z. B. 15 or 20 minutes. However, the given circuit diagram particularly preferably comprises switching the ventilation fan on several times, it being found that the ventilation fan is particularly preferably switched on twice for 15 minutes each day.

In a previous embodiment of the invention it is provided that below a predetermined minimum temperature in the concrete screed, which is also determined on the basis of empirical values, the ventilation fan is not switched on by the central control unit, even if the given circuit diagram would provide for a switch-on, to prevent the concrete screed from cooling down too much.

Preferably, sensors for measuring the prevailing room humidity and room temperature are provided in the area of the building provided with the concrete screed and connected to the central control unit. The ventilation fan can advantageously be switched on by the central control unit for a predetermined period of time, regardless of the specified circuit diagram, during the first period, if the measured value for the screed moisture or for the room humidity in each case reaches a predetermined maximum value, which is also determined based on experience becomes.

It is also from before if the ventilation fan is switched off by the central control unit, if and as long as the measured value of the room temperature has dropped to a predetermined minimum value, this switching step also taking precedence over the specified circuit diagram if this is just starting the ventilation fan would provide.

Another advantageous embodiment of the invention is that during the first period of time, the ventilation fan is switched on by the central control unit for a predetermined period of time, regardless of the predetermined circuit diagram, if the measured value for the screed moisture or for the room humidity is in each case a predetermined maximum value achieved, which increases the drying process for the concrete screed for this application.

With before is further initiated in the arrangement according to the invention when a predetermined minimum value for the moisture in the concrete screed from the central control unit, the second period of the arrangement by starting the control of the flow temperature of the heating circuit of the underfloor heating, with the first turning off the ventilation fan permanently Period is ended. The specification of the predetermined and predetermined minimum value for the moisture in the concrete screed is also used as an empirical value which corresponds to the moisture value in the concrete screed at which the drying of the

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Concrete screed has reached a desired and satisfactory value during the first time.

The measurement and control technology used in the invention is mounted in a central control unit in the form of a control unit, which is preferably designed to be portable and, again, preferably, is accommodated in a robust case, which enables the control unit to be used even in rough construction site operation without the risk of damaging the measurement and control technology.

The ventilation fan can advantageously be installed in a plate made of wood or other suitable material, which can be installed in a window or other room opening that is suitable for ventilation. Via the central control unit, this fan is then switched on and off according to the predetermined circuit diagram and advantageously also depending on the moisture situation detected in each case, as a result of which an optimal drying process in the concrete screed can be achieved.

In an advantageous embodiment of the invention, a controllable in its heating power heater with circulation pump is provided and connected to the heating circuit of the underfloor heating and connected to the central control unit for control.

The use of a heating vehicle controllable in its heating capacity with a circulation pump, which is connected to the heating circuit of the underfloor heating system, ensures that the defined flow temperatures to be used in a given heating curve can be maintained in the heating system even in modern heat pump systems which are suitable for short-term high flow temperatures are not suitable because they have too little power for this. Controllable heating vehicles of this type are already widely used. In the invention, the control of the mobile heater used is taken over by the central control unit.

In the invention, there is advantageously also the possibility of having the central control unit generate and output a traceable log at any time, from which the general conditions and the drying process can be recognized in the concrete screed, which is why the central control unit is preferred for the arrangement according to the invention Output of such a protocol is set up. It is also from the beginning if the data of the protocol can be called up remotely from an external monitoring point or continuously or at certain intervals (e.g. daily or even more often) e.g. B. sent via GSM module to the monitoring station. This allows the construction site (or the situation at several construction sites) and the respective drying status at the construction site in question to be identified. This also allows the further work still required on the construction site, such as the interior work, laying the floor, etc., to be planned well in time, since when the arrangement according to the invention is used, it is no longer possible, as previously, to carry out individual staggered measurements without a connection, but on the basis of the current drying curve recorded in each case, the further course of which can be estimated quite precisely.

In a preferred embodiment of the invention sleeves are poured into the concrete screed to accommodate the sensors for measuring the temperature and moisture of the screed, in which the sensors can be used. The sensors are installed at a certain depth in order to achieve a measurement result that is comparable to each other. A further preferred embodiment of the invention also consists in that sensors for detecting the temperature and humidity of the outside air of the building are additionally provided and connected to the central control unit, as a result of which the drying phase of the concrete screed is controlled even more precisely via an even more precise control of the ventilation fan can be.

The specified circuit diagram is based on empirical values and, for example, consists of switching on the fan twice or several times a day, at predetermined switching times, with it switching on for a predetermined time

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Time period runs out before it is then switched off again. However, it is particularly preferred if it is additionally switched on for one of them depending on the continuously measured values for screed and room moisture when predetermined maximum values are reached and then remains switched on for a predetermined period of time, for example for 15 minutes.

For the implementation of the control according to the invention, a heating curve profile is stored in the central control unit, which serves as a specific setpoint value for controlling the flow temperature of the heating circuit of the floor heating used in the arrangement according to the invention.

It is particularly advantageous in the invention if a separate, transportable energy source is provided for the energy supply of the arrangement according to the invention, so that a connection to another energy source that is otherwise available at the construction site is not necessary.

The drying process according to the invention allows a precisely controllable, automated drying process of the concrete screed, in which the various desired specifications for the drying process are exactly adhered to and thus a continuously running drying process can take place, which leads to good, correct drying, can be carried out economically and economically and at the same time, through the continuous monitoring of the temperature and moisture status in the concrete screed as well as the current change history over time, it also enables a good planning of the drying process.

[0026] The invention is explained in more detail below in principle by way of example with reference to the drawings. Show it:

1 shows a schematic diagram of a control system according to the invention, and [0028] FIG. 2 shows the basic representation of a heating curve for the drying of concrete screed.

In Fig. 1, only in principle, a representation of the structure of a control system according to the invention is shown as it is used for drying the concrete screed 1 of a floor in a (not shown) building.

In a layer of concrete screed 1 (shown only in principle) of z. B. 6 cm thick, lines 2 are embedded in an underfloor heating system, which is operated at a flow temperature T _v and is connected to a heating system (not shown).

The floor structure consists (from bottom to top) of a heavy gravel fill (if necessary for an additional increased sound insulation), insulation (EPS) with a material thickness depending on the desired overall thickness, impact sound insulation panels (mineral, 30 mm) and the concrete screed 1 in the required material thickness (at least 50-60 mm). The illustration in FIG. 1 shows only in principle the construction of the floor from several layers or layers.

Under the floor there is still a foundation, a basement ceiling, a tram ceiling over a ground floor or the like.

1 shows in principle, sleeves 5 are poured into the concrete screed, in which sensors 6 for recording the temperature and moisture of the screed are accommodated. This ensures that the sensors 6 used in the individual sleeves 5 (e.g. analog or digital Sensirion sensors of the SHT21 series, each measuring the relative humidity and the temperature at one measuring point) are all at the same depth ( about 40 mm depth) in the concrete screed 1 in order to obtain measurement results that are comparable to one another. For the sake of clarity, only one sleeve 5 with a sensor 6 located therein is shown in FIG. 1, although in fact several such sleeves with sensors are provided. It has proven expedient to use approximately two or three sensors 6 per building.

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AT515 273 B1 2018-02-15 Austrian Patent Office The lines 2 for the circuit of the underfloor heating are connected to a mobile heater 9 with a circulation pump, as is shown only in principle in FIG. 1: a supply line leads from the mobile heater 9 7 to the lines 2, and from the heating circuit a return line 8 leads back to the mobile heater 9. In this way, the circuit of the lines 2 is connected to the mobile heater 9, the liquid from the lines 2 via the return line 8 back into the mobile heater 9, heated there to a predetermined flow temperature TV, then again by means of the circulation pump via the feed line 7 delivered to the heating circuit for circulation in this and at the end of which is conveyed back to the mobile heater 9 via the return line 8.

Furthermore, a central control unit 10 is provided, which is arranged in a housing designed as a portable case, which ensures good protection against damage from outside even in rough construction site operation.

The measurement signals supplied by the sensors 6 in the concrete screed 1 are continuously fed to the central control unit 10 via signal lines 3. If you use clocked sensors that alternately measure the humidity and the temperature, the result is achieved that only one transmission channel is required for the data transmission.

Via a signal line 4, the central control unit 10 is also connected to the mobile heater 9 for the purpose of emitting control signals to the latter.

Furthermore, at least one room sensor 14 (only one is shown in FIG. 1) is attached in the building in which the concrete screed 1 is installed at a suitable location for detecting the humidity and temperature of the room air, with corresponding signal lines 19 the detected detection signals of all sensors 14 are forwarded to the central control unit 10.

The central control unit 10 is also connected via a control line 20 to a ventilation fan 13 which is mounted in a plate 12 which is mounted within the window opening of a window frame 11.

A heating curve 16 is also stored in the central control unit 10, as is only indicated in principle in FIG. 1, which serves as a setpoint for the control of the flow temperature T _{v of} the heating circuit of the underfloor heating 2 over time Z in the heating phase serves, which follows after the drying phase of the concrete screed 1 and is automatically switched on by the control unit 10 via the mobile heater 2 when the moisture of the concrete screed 1 has reached a predetermined minimum value. Such heating curves are provided by the manufacturers or suppliers of the heating systems. Of course, several different heating curves 16 for different heating systems can also be stored in the control unit 10.

The central control unit 10 controls the fan 13 to dry the room, which is usually done by switching on and off according to a predetermined circuit diagram. Such a circuit diagram can, for. B. are created based on experience, z. B. two or three times switching on the cooling fan 13 per day for 15 minutes each. If, on the basis of the measured moisture and temperature values, it is advisable to switch on more frequently per day and / or a different ventilation period, the control unit 10 can be programmed accordingly. The control device 10 is also designed in such a way that when a predetermined minimum temperature in the concrete screed 1 (e.g. 3 ° C.) or a predetermined minimum room temperature is reached, it deactivates the ventilation fan 13 so that the temperature in the concrete screed 1 is not reduced by ventilation strengthen.

The control system shown only fundamentally in Fig. 1 can of course also be further developed by adding additional elements. B. the possibility of also using suitable sensors (not shown in FIG. 1) to also detect the temperature and humidity of the outside air of the building and to take them into account in the central control unit 10 as additional measured values.

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AT515 273 B1 2018-02-15 austrian patent office [0043] Furthermore, there is also the possibility of not only switching the ventilation fan 13 on and off via the central control unit 10, but also of using such a fan 13, which also includes the fan speed and so that the air flow rate per unit time can be controlled so that the central control unit 10 can also control the speed when the fan 13 is switched on, for example depending on the difference between the outside temperature of the building and the inside temperature of the room, or one of the both and the measured temperature in the concrete screed 1.

The central control unit 10 can be set up so that it continuously issues a status log 17, e.g. B. also in written form, so that a continuous control of the system status and the control steps taken is possible.

However, the central control unit 10 can also (alone or in addition) be designed such that it transmits the system status, that is to say the information contained in the control protocol 17, to a (in FIG. 1) external monitoring point (not shown) continuously (or only at certain intervals) or can be called up by it. This provides the possibility of external monitoring of the control system used and the fact that the current drying status at the construction site in question can be determined.

The mobile heater 9 is a device of a known type, such as have been used for some time in construction sites for different purposes. Such a mobile heater 9 is often operated with a heating line of 13 kW and is provided with a circulation pump of approximately 700 W to maintain a circulation of the heating fluid in the underfloor heating and in the mobile heater 9. With the control system described, it ensures that the relatively high flow temperatures that are required to achieve the desired heating curve profiles in underfloor heating systems can also be safely achieved, which is essential if modern heat pump systems are used for underfloor heating that meet the high short-term requirements Flow temperatures are not suitable in terms of performance.

If, on the other hand, the underfloor heating system embedded in the concrete screed 1 is connected to a heating system which can generate the short-term high flow temperatures for reaching the predetermined heating curves in the heating system, then in the control system shown the mobile heater 9 could be omitted and the central control unit 10 directly can be connected to the existing heating system in order to control the flow temperatures accordingly - as is usually the case with the mobile heater 9.

It is recommended, however, to provide the control system shown with a mobile heater 9, even if an otherwise suitable heating system would be available, and to use this to control the flow temperatures, because then from the start a proper function of the control system for each application the drying of the concrete screed 1 is guaranteed.

A baking curve 16 for the drying of concrete screed is shown in Fig. 2 in a basic representation, the graph 18 of the baking curve the course of the flow temperature to be set on the underfloor heating T _v (in ° C) over time Z (in days ) reproduces.

In the heating phase, which takes place according to a heating curve 18 according to FIG. 2 from the central control device 10 via the mobile heater 9, as can be seen from FIG. 2, the flow temperature T _{v of} the heating circuit of the underfloor heating 2 to 20 on the first day ° C, then increased on the second to sixth day by 5 ° C until a maximum flow temperature T _Vm ax of 45 ° C was reached and held there for eight days. On the fourteenth day, the flow temperature T _{v is} reduced again to 35 ° C and on the fifteenth day to 25 ° C. The flow temperature then remains at this value until the end of the heating phase, which can be reached after approx. 30 days.

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Claims (15)

claims 1. Arrangement for drying concrete screed (1) in a building, wherein in the concrete screed (1) a floor heating (2) connected to a heating system with a heating circuit with flow temperature (T _v ) is attached, with a in a window (11) or an opening of the building mountable ventilation fan (13), with sensors (6) mounted in the concrete screed (1) at a predetermined depth for measuring the moisture of the concrete screed (1), and with a central control unit (10) to which the ventilation fan is connected (13), the heating system and the sensors (6) are connected, the control unit (10) being designed in such a way that, depending on the moisture of the concrete screed (1) measured by the sensors (6), it corresponds to the ventilation fan (13) switches a specified circuit diagram on and off until a minimum moisture value of the concrete screed (1) is reached, when the minimum moisture value in the concrete screed (1) is reached switches off the ventilation fan (13) and then controls the flow temperature (T _v ) in the heating circuit of the underfloor heating (2) according to a predetermined heating curve (16) during a heating phase via the heating system. 2. Arrangement according to claim 1, characterized in that the predetermined switching scheme comprises switching the ventilation fan (13) one or more times a day with subsequent subsequent operation of the same over a predetermined period of time. 3. Arrangement according to claim 2, characterized in that the ventilation fan (13) is switched on twice a day for 15 minutes each. 4. Arrangement according to one of claims 1 to 3, characterized in that in the area of the building provided with the concrete screed (1) also sensors (14, 15) are provided for measuring the prevailing room humidity and room temperature and are sent to the central control unit (10). are connected. 5. Arrangement according to claim 4, characterized in that the ventilation fan (13) is switched off by the central control unit (10) when and as long as the measured value of the room temperature has dropped to a predetermined minimum value. 6. Arrangement according to one of claims 1 to 5, characterized in that for receiving the sensors (6) for measuring the moisture in the concrete screed (1) are poured into these sleeves (5), in which the sensors (6) are inserted. 7. Arrangement according to one of claims 1 to 6, characterized in that the heating system is designed as a controllable in its heating output mobile heater (9) with a circulation pump, connected to the heating circuit of the underfloor heating (2) and connected to the central control unit (10) is. 8. Arrangement according to one of claims 1 to 7, characterized in that the central control unit (10) is designed to be portable. 9. Arrangement according to claim 8, characterized in that the central control unit (10) is accommodated in a robust case. 10. Arrangement according to one of claims 1 to 9, characterized in that the central control unit (10) is set up to output a running log (17) with details of the general conditions for the control and the drying process of the concrete screed (1). 11. Arrangement according to one of claims 1 to 10, characterized in that the data of the protocol (17) by remote transmission (15) are forwarded to an external monitoring point or can be called up by this. 12. Arrangement according to one of claims 1 to 11, characterized in that a transportable energy source is provided for the energy supply of the arrangement. 7.9 AT515 273 B1 2018-02-15 Austrian patent office 13. Arrangement according to one of claims 1 to 12, characterized in that sensors for detecting the temperature and humidity of the outside air of the building are provided and connected to the central control unit (10). 14. A method for drying concrete screed (1) in a building using an arrangement according to one of the preceding claims, wherein the concrete screed (1) has underfloor heating (2) with a heating circuit with flow temperature (T _v ), the moisture of the concrete screed continuously (1) is measured, a ventilation fan (13) is switched on and off as a function of the measured moisture in the concrete screed (1) for discharging the ambient air in accordance with a predetermined circuit diagram, with the concrete screed (1) reaching a predetermined minimum moisture value Ventilation fan (13) switched off and a time-dependent control of the flow temperature (T _v ) of the heating circuit of the underfloor heating (2) is triggered according to a predetermined heating curve (16). 15. The method according to claim 14, in which the room humidity is measured and the ventilation fan (13) is switched on for a predetermined period of time, regardless of the predetermined circuit diagram, if the measured value for the moisture of the concrete screed (1) or for the room humidity in each case a predetermined maximum value reached.