DE3123649A1 - Method and device for controlling the forward-run temperatures of central heating installations - Google Patents

Abstract

The forward-run temperatures of central heating installations are according to the invention raised or lowered via feedback of the positions of the flowthrough valves from thermostat valves in the individual rooms to a central control unit. The central control unit attempts in this case to keep all thermostat valves constantly in a state of play; it raises the forward-run temperature if one or more valves indicate "OPEN" and lowers the forward-run temperature if one or more valves indicate "SHUT". This control detects transmission and ventilation heat requirement, indirectly and depending upon the outside temperature, in the individual rooms corresponding to the actual values. According to further features of the invention, the thermostat valves can, to lower the room temperatures, additionally be acted upon in terms of temperature via electric resistances or the "OPEN" position of the valves can also be indicated by a visual check. The users can thus decide whether they accept the increase triggered by the "OPEN" position or turn back the thermostat valve and thus cancel the "OPEN" contacting.

Description

Method and device for controlling the flow temperature

central heating systems.

The invention relates to a method and the device for controlling the flow temperatures of central heating systems according to the current heat demand the individual rooms of a building and the outside temperature.

Well-known "weather-compensated flow temperature controls" work with the outside temperature as a reference variable over a selected functional relationship between outside temperature and flow temperature. This connection - the steepness the heating curve - is normally set so that the flow temperature sufficient to meet the heat demand at any time and for any room.

If an additional room thermostat is used as a correction element in one of the rooms is used, the flow temperature is based on the heat demand of this room tracked.

The disadvantage of these controls is that the heating system almost always is operated with higher flow temperatures than would be necessary; to it In principle, the correction by a single room thermostat does not change anything.

However, excessively high flow temperatures mean increased distribution losses and in the case of heating with heat pumps, also poorer coefficients of performance.

On the other hand, there are "thermostatic valves ;; known that regulate the room temperature of the corresponding room via the flow rate of the heating water through the regulate heat-transferring radiators regardless of the flow temperature, if this is sufficient, the set room temperature at full flow, i.e. to be maintained with the flow valve fully OPEN; a retroactive effect does not insist on the flow temperature.

According to the invention it is therefore proposed to adjust the position of the flow valve to use such thermostatic valves to control the flow temperature.

In a building there are more or less large numbers of Rooms with individually and temporally different heat requirements and different additional heat load, e.g. due to high lighting densities, solar radiation, different ventilation requirements and the like

In the case of thermostatic valves, it is now via encoder, in the simplest case via Limit contacts, the OPEN and CLOSED position, or an intermediate position range of e.g. + 1.5 K is reported back to a central control unit, which always provides a flow temperature regulated, all thermostatic valves in the game state, or within the range the border contacts hold, this is expediently delayed, always on the respective just required value adjusted.

In practice, however, there will be cases in which there is a need for heat of a room goes to 0, i.e. the corresponding thermostatic valve closes and whose limit contact reports "CLOSED", but in another room, e.g. by raising it the room temperature there is a high demand and the thermostatic valve there is "OPEN" reports. The central control unit must therefore increase the flow temperature in any case, if only one of the valves remains in the OPEN position, regardless of the position the other valves are located; it must reduce the flow temperature if one the valves are in the CLOSED position and the other valves are in the play area.

This ensures that both a currently high heat demand of a room is covered, and the flow temperature is always at its lowest possible value is readjusted. If all valves go to the CLOSED contact, the central control unit can also switch off the heating pump and heat generator.

Such a control is thus both directly dependent on the desired Room temperature, i.e. it covers every individual need for comfort. The heat demand However, it is a function of the temperature difference between room temperature and outside temperature; the flow temperature is thus indirect, however, the actual transmission losses accordingly, better guided depending on the outside temperature than with the known weather-guided Controls.

It is also possible to take measures to lower the temperature on the thermostatic valves to be provided, e.g. in the known manner of an additional temperature application the control membrane by means of decentrally or centrally controlled electrical resistors; the amount of the lowering can be specified as required by different voltages it is also possible to adjust the valves electromechanically for lowering.

The central control unit reduces when one or more of them are lowered Valves first the flow temperature until one of the thermostatic valves that has not been lowered goes to the OPEN position and then regulates the required flow temperature not lowered thermostatic valves. However, it is also possible to use the CLOSED contact to suppress the lowered valves.

In order to give the residents the opportunity to use additional energy save, according to a further feature of the invention, the OPEN positions of the Thermostatic valves with indicators equipped, e.g. with signal lamps on the thermostatic valves or on the central control unit. The residents can then decide whether to increase the flow temperature for convenience accept the central control unit, or the temperature of the corresponding room reduce and thus cancel the OPEN contact of the associated thermostatic valve.

Claims (5)

P a t e n t a n s p r üch e Process and device for control the flow temperature of central heating systems according to the current heat demand the individual rooms of a building and the outside temperature, characterized that the position of the flow valve of thermostatic valves to control the Flow temperature is used. 2. The method and device according to claim 1, characterized in that that the position of the flow valves is in a range of flAUF? to "TO" above electrical encoders, e.g. via limit contacts to a central control unit will. 3. The method and device according to claim 1 and / or 2, characterized in that that the central control unit increases the flow temperature when one of the transmitters a defined limit value in the direction OPEN or "OFF" has been reached, and the flow temperature reduced if one of the encoders exceeds a specified limit value in the CLOSE direction, or "CLOSED" reached and no other encoder reached a limit value in the OPEN or "OPEN" direction has reached. 4. The method and device according to one or more of the claims 1 to 3, characterized in that in the thermostatic valves by means of electrical Heating of the control diaphragms, or electromechanical adjustment, options are provided for lowering the temperature. 5. The method and device according to one or more of the claims 1 to 4, characterized in that signaling devices, e.g. signal lamps, are connected to the Thermostatic valves, or in the central control unit, reaching the set Display limit value in direction OPEN, or 1? OPEN11.