Apparatus for controlling a heating system, particularly in premises

The invention relates to a device for regulating a heating system, in particular a residential building, with a heating controller which is connected on the one hand to an outside temperature sensor and on the other hand to a heating curve memory for the setpoint specification of a controlled variable as a function of the outside temperature. with an input and display device for different outside temperatures assigned heating curve points and with a computer stage connected to the input and display device for changing the heating curve given by two heating curve points for different outside temperatures.

Due to the physical properties of buildings with regard to heat storage and the heat transfer, which is particularly important for heat losses, the heat requirement for ensuring a given room temperature is dependent on the outside temperature. In order to take this dependency into account, building heating systems are used with

Controlled heating curves, which, for example, specify the flow temperature of a heating system as a setpoint for the heating controller as a function of the outside temperature. If the room temperature deviates from the specified setpoint at a certain outside temperature, z. B. the setpoint specification for the flow temperature for this outside temperature can be adjusted to the heat demand of the building to be heated by a parallel shift of the heating curve. However, the associated shift in the base of the heating curve does not yet take into account the heat demand, which changes with the outside temperature and depends on the respective thermal properties of the building to be heated, which is expressed in the slope of the heating curve. This means that if the heating curve is too flat with regard to the heating characteristics of a building to be heated, this heating curve, based on an operating point precisely matched to the heat requirement, specifies too low a heat requirement with decreasing outside temperatures and too high a heat demand with rising outside temperatures, with the result that the room temperature increases or decreases with the outside temperature. Because the heating curve is too steep for the thermal properties of the building, there is an excess supply of heat when the outside temperature drops, while when the outside temperature rises, the heat supply determined by the heating curve is too low. In order to adapt a heating curve to the heating and heating requirements given by a specific building, the slope of the heating curve must therefore also be adjusted, which can generally only be carried out at a further operating point related to a different outside temperature, with the risk that the operating point that has already been set must be readjusted so that only after a complex, repeated adjustment of the heating curve one the properties of the respective building and the

Heating system with sufficient accuracy taking into account setpoint specification becomes possible.

In order to determine the slope of a heating curve, it is known (DE 43 39 802 A1) to define the heating curve with the aid of two heating curve points which are assigned to certain outside temperatures. However, it remains open how the slope of the heating curve set can be changed in such a way that an advantageous adaptation to the thermal properties of the building can easily be made.

The invention is therefore based on the object of designing a device for regulating a heating system, in particular a residential building, of the type described at the beginning so that a sufficiently precise setpoint specification for the heating controller can be ensured with simple means, even when the outside temperature changes as a function of to be able to maintain a constant room temperature for the relevant properties of the building to be heated or the heating system.

The invention solves the problem in that the computer stage has a program memory for calculating the heating curve from at least two heating curve points that can be specified via the input and display device for different outside temperatures and that the heating curve point and from a heating curve point newly specified via the input and display device a heating curve point stored in the heating curve memory

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Heating curve, the newly calculated heating curve can be read into the heating curve memory via the computer level.

As a result of these measures, a heating curve point related to a measured outside temperature can be checked on the basis of the measured room temperature to determine whether the setpoint specified by this heating curve point for the control variable of the heating controller corresponds to the actual heat demand. If a correction is necessary, the heating curve is recalculated with the aid of the corrected heating curve point, so that a modified slope for the heating curve is obtained due to the correction of only one point of a pair of points. Although the decisive thermal conditions can generally be recorded with sufficient accuracy with a linear dependency between the outside temperature and the setpoint for the controlled variable of a building heating system, deviations from a linear heating curve can easily be taken into account for fine adjustments by specifying additional heating curve points.

In order to avoid excessive changes in the slope when correcting the heating curve, only heating curve points can be taken into account when recalculating a heating curve that belong to a lower and an upper measuring range of the outside temperature sensor stored in corresponding memories. This means that a correction can only be carried out with measured values ​​within the specified outside temperature ranges. The lower heating curve points are corrected in the upper outside temperature range and the upper heating curve points in the lower outside temperature range with the advantage that the corrected upper heating curve points are not adjusted when the lower heating curve points are shifted and, conversely, the corrected lower heating curve points are not adjusted when the upper heating curve points are shifted.

Since the heating curve, which is decisive for the setpoint specification of the controlled variable, is checked using the room temperature as a function of the outside temperature and changes in the outside temperature only have a delayed effect on the room temperature, it is advisable to use the computer level with an averaging for the over a given period of time measured outside temperatures in order to ensure that the heating control is not to be able to suppress short-term outside temperature fluctuations with regard to the definition of the heating curve.

The subject of the invention is shown in the drawing, for example. Show it

1 shows a device according to the invention for regulating a heating system, in particular a residential building, in a schematic block diagram, and FIG

2 shows a heating curve as a function of the flow temperature of a heating system from the outside temperature in connection with a correction of a heating curve point.

According to FIG. 1, the heating controller 1 belonging to a conventional heating system is connected on the one hand to a heating curve memory 2 and on the other hand to an outside temperature sensor 3 in order to regulate the heating as a function of the outside temperature measured in each case so that a predetermined setpoint for the room temperature is ensured. As shown in Fig. 2 which shows the relationship between the outside temperature plotted on the abscissa and the heating flow temperature plotted on the ordinate in the form of a heating curve 4, taking into account the respective heating properties, for the building to be heated, With the help of the heating curve 4, the flow temperature required to achieve a given room temperature can be read off as a control variable for the heating controller 1 for a specific outside temperature. In order to maintain a given room temperature when the outside temperature changes, it is therefore of crucial importance that the heating curve 4 shows the relevant thermal properties of the building to be heated and the heating or heating used for heating the building. of the connected heat distribution system with sufficient accuracy 4

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For this purpose, a heating curve 4 is first calculated from two heating curve points 5 and 6, which can represent empirical values. Although the heating curve points 5 and 6 are advantageously selected according to the temperatures on which the heating calculation is based, any outside temperatures can be used for the heating curve calculation. According to FIG. 2, the setpoint values ​​of the flow temperature are specified for an outside temperature of + 12 ° C and -10 ° C. The heating curve points 5 and 6 are fed via an input and display device 7 to a computer connected to a program memory 8, which calculates the heating curve 4 from the heating curve points 5 and 6 entered using a program that can be called up from the program memory 8 and is stored in the heating curve memory 2 as Setpoint specification for heating controller 1 is saved. If, on the basis of the heating control carried out by the heating curve 4, it is determined that the room temperature detectable by a room temperature sensor 10 deviates from the setpoint given by the heating curve 4, the heating curve 4 can be corrected accordingly in a simple manner. If, according to FIG. 2, it is assumed that the room temperature is too low compared to the setpoint to be specified by the heating curve 4, the heating curve 4 must be raised accordingly in this area. If the room temperature deviates from the setpoint, for example at + 10 ° C outside temperature, a corrected heating curve point 11 can be specified to recalculate heating curve 4, which takes into account the higher flow temperature related to the outside temperature of + 10 ° C. By recalculating the heating curve via the computer stage 9 on the basis of the original heating curve point 6 and the corrected heating curve point 11, the corrected heating curve course 12 is obtained, stored and given to the heating controller 1. After a correction that may be necessary even at low outside temperatures, the heating curve can thus be adapted with sufficient accuracy to the respective thermal specifications of the building to be heated, the heating system used for this purpose and the heat distribution system.

In order to enable a correspondingly sensitive adjustment of the heating curve 4 to the prevailing thermal engineering conditions, the outside temperatures for the heating curve points on which the heating curve calculation is based should be correspondingly far apart. For this purpose, only heating curve points that lie in a lower outside temperature range 13 and in an upper outside temperature range 14 can be permitted for the heating curve calculation. These predeterminable outside temperature ranges, which depend on the respective climatic conditions, are stored in corresponding memories 15 and 16 in order to check whether the heating curve points read in by the input and display device 7 are permissible for calculating the heating curve.

In order to suppress short-term fluctuations in outside temperature that are not relevant for heating control when adapting the heating curve 4, an average value for the outside temperature calculated over a given period of time can be used when checking the room temperature in the given outside temperature ranges 13 and 14. The computer stage 9 consequently includes a corresponding averaging unit 17 for the outside temperature. In addition, it is advisable to also apply the mean value of the outside temperature to heating controller 1.

In order to be able to take into account changes in the room temperature that are independent of the outside temperature, the heating controller 1 can take such room temperature fluctuations into account using a corresponding program.

To recalculate a heating curve based on a corrected and an existing heating curve point, it goes without saying that an entered, existing heating curve point does not have to be used. A calculated point can also be used for this, for example to be able to carry out the calculation when the outside temperature range is as large as possible. For the calculation of the new heating curve, in execution 5

AT 413 893 B, for example according to FIG. 2, in addition to the corrected heating curve point 11, the calculated heating curve point 18, which is related to the lowest temperature of the lower outside temperature range 13, can be used. This results in a slightly smaller change in the slope of the newly calculated heating curve, with the flow temperature being raised over a larger outside temperature range, which generally creates good adaptation conditions.