DE102018115838A1 - Process for operating a temperature control system, temperature control system and measuring device - Google Patents

Abstract

A method is described for operating a temperature control system (4) for at least one interior, with at least one heat source (8), at least one heat sink (16, 18, 20), the heat source (8) and heat sink (16, 18, 20) being used a closed fluid circuit (14) are flow-connected to one another, and at least one pump (10) arranged in the fluid circuit (14) for conveying the fluid in the fluid circuit (14), with the following steps: - measuring a flow temperature (VLT) between the at least one heat source (8) and the at least one heat sink (16, 18, 20), - measuring a return temperature (RLT) between the at least one heat sink (16, 18, 20) and the heat source (8), the return temperature (RLT) being present several heat sinks (16, 18, 20) behind a merging (24) of several partial fluid circuits (14.1, 14.2, 14.3) is measured, - measuring an outside temperature (AT), - supplying the flow temperature (VLT), the return flow temperature (RLT) and the outside temperature (AT) to a control unit (12) of the temperature control system (4), - wherein the control unit (14) an optimal return temperature (RLToptimal) from the measured values of the flow temperature (VLT), the return temperature (RLT) and of the outside temperature (AT) - the control unit (12) adjusts the flow temperature (VLT) and / or a fluid mass flow by changing the delivery rate of the pump (10) when a deviation between the measured return temperature (RLT) and the optimal return temperature (RLToptimal) is determined If the return temperature (RLT) and the optimum return temperature (RLToptimal) are determined, the control unit (12) does not adjust the flow temperature (VLT) or the fluid mass flow, the process being repeated at a predetermined control interval a corresponding temperature control system (4) and a measuring device (50).

Description

In the present case, a method for operating a temperature control system, a temperature control system and a measuring device are described.

Temperature control systems are systems that are used for cooling or heating. Systems that are used for heating have radiators that emit heat. Systems that are used for cooling, however, have heat sinks that can absorb heat. For the heat transport within the temperature control systems, a fluid is usually used, which is transported to the radiators or heaters by appropriate fluid lines and is transported away from them. A closed fluid circuit is usually specified which has a heat source or a heat sink in the circuit.

Temperature control systems can be found in the form of heaters in most households. The area downstream or behind the heat source is called forward, the area in front of the heat source is called return. The fluid of a heater is usually referred to as heating water. Exothermic conversion processes can be considered as heat sources. Burners are usually used here, which mostly burn fossil fuels such as oil, gas, coal or wood. On the other hand, devices are known which extract heat from other media. This category includes air or geothermal heat pumps. Other heat sources can e.g. Use heat radiation, e.g. solar thermal systems.

The heat emitted by radiators or absorbed by heat sinks is essentially determined by two influencing variables: the temperature of the fluid that flows through the radiators or the heat sinks and the mass flow of the fluid flowing through the heater or heat sinks. The higher the temperature of the fluid, the higher the heat output from a radiator with a constant mass flow. If the mass flow is increased, the power output of the radiator can be increased at the same fluid temperature, since the average surface temperature of the radiator and thus the temperature gradient between the radiator and the room increases.

In order to achieve a specified target temperature in a room with a radiator, the mass flows of the fluid with all radiators in a heating system must be adjusted to the target condition of the room to be temperature-controlled, which experts call "hydraulic balancing". The same applies to the temperature of this fluid, which is referred to as "thermal balancing".

The hydraulic balancing determines the technical measures by which the fluid in a closed system, for example a heating system, can be directed in such a way that each radiator receives the appropriate mass flow of fluid. The hydraulic balancing means that exactly the mass flow of the fluid flows through the pipes to the radiators that is needed. The aim of the hydraulic balancing is therefore to supply the heating water in exactly the right amount to every point in the network by installing bottlenecks in the pipes.

If the hydraulic balancing is not carried out in a heating system, individual rooms are not sufficiently heated. The hot water from the heat source or heating center flows in abundance into those radiators which are in the vicinity of a pump used to convey the fluid. Rooms that are further away receive too little heating water from the heat source.

The same applies to thermal balancing. In practice, if some rooms remain too cool, the water temperature is often raised in the flow, which however leads to increased energy consumption. With poorly set heating systems, this reduces the efficiency of the system because there is no waste heat used to heat the rooms, which dissipates into the environment.

Alternatively, the pump output and thus the mass flow can be increased. By increasing the pump output, the heating water also reaches those radiators that previously received too little heating water. However, all other radiators that already had sufficient heating water are now supplied with even more power, which means that these radiators overheat the environment.

The heat demand of the rooms depends on the heat loss of the rooms, which in turn mainly depends on the difference between the outside temperature and the target temperature for given rooms. Therefore, modern systems usually have outside temperature sensors, the value of which is controlled by a heating system Adjustment of the flow temperature is used. The relationship between the outside temperature and the flow temperature is called the heating curve.

Raising the heating curve means that the flow temperature is increased. The heating water reaches the radiators at a higher temperature. These can now give off more heat. This also applies to all radiators and not only to those previously poorly supplied, which leads to wasted energy.

The thermal output of a heat sink is usually described by manufacturers of heating systems with three values (triple): the flow temperature, the return temperature and the room temperature. If these nominal values are observed, the nominal output of the heating system is guaranteed. Typical triples are (75, 65, 20), (70, 55, 20) or (55, 45, 20) for radiators or (35, 28, 20) for surface heating.

• 1.1 es werden Anlagenparameter initialisiert und in einer zentralen Regeleinheit hinterlegt;
• 1.2 es werden die Rücklauftemperaturen des Fluids, dass die Heizkreise verlässt, die Gesamtzahl aller Heizkreise sowie die Ventilöffnungen ermittelt und an die zentrale Regeleinheit übermittelt;
• 1.3 es werden eine Außentemperatur und eine Vorlauftemperatur gemessen und eine ideale Rücklauftemperatur berechnet;
• 1.4 es wird die Anzahl aller Heizkreise der Temperieranlage ermittelt, bei denen die Rücklauftemperatur kleiner ist als die ideale Rücklauftemperatur;
• 1.5 es wird die Anzahl der Heizkreise ermittelt, bei denen die Rücklauftemperatur größer ist als die ideale Rücklauftemperatur;
• 1.6 es wird die Anzahl der Heizkreise ermittelt, deren Ventilöffnung kleiner ist als ein unterer Ventilöffnungsschwellenwert;
• 1.7 es wird die Anzahl der Heizkreise ermittelt, deren Ventilöffnung größer ist als ein oberer Ventilöffnungsschwellenwert;
• 1.8 es wird der Massenstrom des Fluids verringert, wenn es einen Heizkreis gibt, dessen Rücklauftemperatur größer ist als die ideale Rücklauftemperatur, oder es wird, wenn keine solchen Heizkreise existieren, der Massenstrom des Fluids erhöht, wenn alle Heizkreise Rücklauftemperaturen haben, die kleiner sind als die ideale Rücklauftemperatur;
• 1.9 es wird die Vorlauftemperatur angehoben, wenn es einen Heizkreis gibt, dessen Ventilöffnung größer ist als der obere Ventilöffnungsschwellenwert, oder es wird, wenn keine solchen Heizkreise existieren, die Vorlauftemperatur abgesenkt, wenn Heizkreise Ventilöffnungen haben, die kleiner sind als der untere Ventilöffnungsschwellenwert oder wenn alle Heizkreise Rücklauftemperaturen haben, die kleiner sind als die ideale Rücklauftemperatur;
• 1.10 die Schritte 1.2 bis 1.9 werden solange wiederholt, bis bei zumindest einem Heizkreis die Rücklauftemperatur der idealen Rücklauftemperatur entspricht.

From the DE 10 2012 020 750 B4 A method for optimizing thermal and hydraulic balancing in a temperature control system with several heating circuits is known, a fluid flowing through the heating circuits, comprising the following steps:

• 1.1 system parameters are initialized and stored in a central control unit;
• 1.2 the return temperatures of the fluid leaving the heating circuits, the total number of all heating circuits and the valve openings are determined and transmitted to the central control unit;
• 1.3 an outside temperature and a flow temperature are measured and an ideal return temperature is calculated;
• 1.4 the number of all heating circuits in the temperature control system is determined for which the return temperature is lower than the ideal return temperature;
• 1.5 the number of heating circuits is determined for which the return temperature is higher than the ideal return temperature;
• 1.6 the number of heating circuits whose valve opening is smaller than a lower valve opening threshold value is determined;
• 1.7 the number of heating circuits whose valve opening is greater than an upper valve opening threshold is determined;
• 1.8 the mass flow of the fluid is reduced if there is a heating circuit whose return temperature is higher than the ideal return temperature, or if there are no such heating circuits, the mass flow of the fluid is increased if all heating circuits have return temperatures that are lower than the ideal return temperature;
• 1.9 the flow temperature is raised if there is a heating circuit whose valve opening is greater than the upper valve opening threshold, or if there are no heating circuits, the flow temperature is lowered if heating circuits have valve openings that are smaller than the lower valve opening threshold or if all heating circuits have return temperatures that are lower than the ideal return temperature;
• 1.10 the steps 1.2 to 1.9 are repeated until in at least one heating circuit the return temperature corresponds to the ideal return temperature.

That in the DE 10 2012 020 750 B1 Although the method described is very precise, it has the disadvantage that each heat sink, for example each radiator, must be equipped with a measurement and data transmission device. This makes corresponding systems expensive to manufacture, assemble and maintain. Retrofitting in existing temperature control systems is also very complex and expensive, so that the cost-benefit ratio is not optimal.

Thus, the task arises to further develop methods and devices of the type mentioned in the introduction such that a simpler hydraulic and thermal optimization of temperature control systems is possible than hitherto.

The object is achieved by a method for operating a temperature control system according to claim 1, by a temperature control system according to independent claim 8 and a measuring device according to independent claim 11. Further developments and developments are the subject of the dependent claims.

• - Messen einer Vorlauftemperatur zwischen der wenigstens einen Wärmequelle und der wenigstens einen Wärmesenke,
• - Messen einer Rücklauftemperatur zwischen der wenigstens einen Wärmesenke und der Wärmequelle, wobei die Rücklauftemperatur bei Vorhandensein mehrerer Wärmesenken hinter einer Zusammenführung mehrerer Teilfluidkreise gemessen wird,
• - Messen einer Außentemperatur,
• - Zuführen der Messwerte der Vorlauftemperatur, der Rücklauftemperatur und der Außentemperatur zu einer Regelungseinheit der Temperieranlage,
• - wobei die Regelungseinheit eine optimale Rücklauftemperatur aus den Messwerten der Vorlauftemperatur, der Rücklauftemperatur und der Außentemperatur bestimmt,
• - wobei die Regelungseinheit bei Feststellen einer Abweichung zwischen gemessener Rücklauftemperatur und optimaler Rücklauftemperatur die Vorlauftemperatur und/oder einen Fluidmassestrom durch Änderung der Förderleistung der Pumpe anpasst,
• - wobei bei Feststellen einer Übereinstimmung von Rücklauftemperatur und optimaler Rücklauftemperatur keine Anpassung der Vorlauftemperatur oder des Fluidmassestroms durch die Regelungseinheit stattfindet,

wobei das Verfahren in einem vorgegebenen Regelungsintervall wiederholt wird. A method for operating a temperature control system for at least one interior space is described below, the temperature control system having at least one heat source and at least one heat sink, the heat source and heat sink being fluidly connected to one another via a closed fluid circuit, and at least one pump arranged in the fluid circuit for conveying the fluid in the Fluid circuit, with the following steps:

• Measuring a flow temperature between the at least one heat source and the at least one heat sink,
• Measuring a return temperature between the at least one heat sink and the heat source, the return temperature being measured in the presence of several heat sinks behind a merging of several partial fluid circuits,
• - measuring an outside temperature,
• - supplying the measured values of the flow temperature, the return temperature and the outside temperature to a control unit of the temperature control system,
• the control unit determines an optimal return temperature from the measured values of the supply temperature, the return temperature and the outside temperature,
• the control unit adjusts the flow temperature and / or a fluid mass flow by changing the delivery capacity of the pump when a deviation between the measured return temperature and the optimum return temperature is determined,
• if the return temperature and the optimal return temperature are not matched by the control unit, the feed temperature or the fluid mass flow is not adjusted,

the method being repeated at a predetermined control interval.

Flow temperature and return temperature can be measured centrally in the method described above, for example in the vicinity of the heat source. This means that all relevant measured variables apart from the outside temperature in the vicinity of the control unit can be recorded. The effort to install a corresponding temperature control system or to upgrade a previously conventional temperature control system, so that it is able to implement the method described here, can thus be kept significantly lower than in the known methods. The computing power required to carry out the method can also be kept lower than in other known methods for thermal and hydraulic balancing.

A temperature control system that implements the method described above can adapt itself to the conditions of the interior or spaces to be temperature-controlled and will repeat this again and again if the configuration of one or more heat sinks is changed, for example because a room is heated more or less strongly and a corresponding controller is actuated. Because the process is carried out at regular intervals, the phase in which the temperature control system is not operated in the optimal operating state is comparatively short compared to the total annual operating time in most regions.

In the event that the temperature control system is a heater for a house, for example a residential house, the heat source can be, for example, a burner or a heat pump. In this case, for example, radiators or underfloor heating can be used as heat sinks. In such systems, the fluid is mostly heating water.

• - wenn die Rücklauftemperatur unterhalb einer optimalen Rücklauftemperatur liegt, die Vorlauftemperatur um ein vorgegebenes Maß abgesenkt wird und der Fluid Massestrom um ein vorgegebenes Maß erhöht wird,

oder wobei,

• - wenn die Rücklauftemperatur oberhalb der optimalen Rücklauftemperatur liegt, die Vorlauftemperatur angehoben und der Massestrom abgesenkt wird.

A first further development of the method provides that

• if the return temperature is below an optimal return temperature, the supply temperature is reduced by a predetermined amount and the fluid mass flow is increased by a predetermined amount,

or where,

• - If the return temperature is above the optimal return temperature, the supply temperature is raised and the mass flow is reduced.

The optimal return temperature is determined by a supply temperature return temperature function, which will be described in more detail below. The aforementioned function is plant-specific and defines a spread between the flow temperature and the return temperature, which allows the temperature control system to be operated with optimum efficiency.

In order to limit the control interventions and to prevent an oscillating behavior of the method, a tolerance range around the optimum return temperature can be provided, within which no control intervention takes place. The tolerance range can be, for example, ± 1 ° C, ± 2 ° C, ± 3 ° C, ± 4 ° C, ± 5 ° C or values in between. This means that if the return temperature is within the tolerance range around the optimal temperature, the supply temperature and / or mass flow will not be adjusted.

In another development, it can be provided that a control interval between 6 h and 24 h, in particular between 12 h and 24 h, in particular 24 h or a multiple of 24 h, e.g. every other day or once a week. Temperature control systems are relatively sluggish due to the small temperature differences and the large thermal masses of the temperature control systems themselves and the rooms temperature-controlled by them, so that a corresponding control interval takes into account the time required until the thermal system consisting of temperature control system and rooms has stabilized.

In another development, it can be provided that parameters of a heating curve and / or an optimal flow temperature-return temperature function are stored in the control unit when the temperature control system is initiated. For this purpose, a corresponding memory, in particular a rewritable memory (RAM), can be provided in the control unit.

The heating curve creates a connection between the outside temperature and the flow temperature. The flow temperature-return temperature function creates a relationship between the return temperature and the flow temperature, from which the spread, i.e. the temperature difference between the flow temperature and the return temperature, can be derived.

According to a further embodiment, the heating curve is stored in the control unit by two values. The heating curve is usually a straight line. The straight line is often specified either by a base point and an incline or by two points on the straight line. Both variants can be used in the process described here.

In another development, it can be provided that the flow temperature-return temperature function is a linear, exponential or logarithmic function or a map. It is therefore possible to very closely approximate the optimum efficiency at each operating point of the temperature control system.

A first independent subject relates to a temperature control system with at least one heat source and at least one heat sink, the heat source and heat sink being connected to one another in a fluid flow via a closed fluid circuit, and at least one pump arranged in the fluid circuit for conveying a fluid in the fluid circuit, a control unit being provided with a flow temperature sensor, a return temperature sensor and an outside temperature sensor is connected in a signal-conducting manner, the control unit being set up to control the heat source and the pump, the control unit having a clock and a writable memory, the control unit being set up to set control parameters as a function of the supply temperature and return temperature To adjust outside temperature and pump parameters and store them in the memory.

The memory can be a rewritable memory (RAM). A corresponding temperature control system can adjust itself to the respective individual conditions of the room or rooms. After an appropriate adjustment phase over the relevant temperature range, the temperature control system runs very stably in the optimal operating state, which minimizes energy consumption.

A first further embodiment provides that the control unit is set up to determine the control parameters according to the previously described method.

Another further embodiment provides that the control unit has a processor which is connected to a memory, a computer program being stored in the memory and, when it is loaded and executed by the processor, carries out the method described above.

Another independent subject relates to a computer program product that, when loaded and executed by a processor, performs the previously described method.

Another independent subject relates to a measuring device with an outside temperature sensor, a flow temperature sensor, a return temperature sensor and an input device for a slope and a comfort temperature, a computing unit being provided which consists of measured values for outside temperature, flow temperature and return temperature as well as the entered slope and comfort temperature for calculating an optimal return temperature is set up, a display being provided which is set up to display deviations between the return temperature and the optimum return temperature and / or instructions for setting a temperature control system measured with the measuring device.

The input device can be, for example, a keyboard or a touch-sensitive screen. Depending on the design, the input device can be used to enter further parameters of the temperature control system, for example an outside design temperature, a heating limit temperature and / or a tolerance.

With the aid of such a measuring device, existing temperature control systems such as heating systems can be checked and simple manual optimization can be carried out on the temperature control system on the basis of the information output by the measuring device. The display can be, for example, a screen or a row of lights, e.g. a row of LEDs. In alternative configurations, other variables characterizing the temperature control system can be entered, e.g. another parameterization of a heating curve and its limits. Operating parameters would be, for example, the heating curve and pump setting. The pump setting can be in the form of a characteristic curve, for example.

In an equivalent embodiment, one or more connections for connecting to external sensors can be provided instead of a separate flow temperature sensor and return temperature sensor.

A first further embodiment can provide a memory connected to the computing unit, on which a computer program product is stored, which, when loaded and executed by a processor, carries out the previously described method.

According to another further embodiment, an interface can be provided for connection to a control unit of a temperature control system, with operating parameters for storage in the temperature control system being transferable via the interface. In this way, the optimization of existing heating systems can be further simplified.

• 1 ein Haus mit einer Heizung;
• 2 ein Nenn-Rücklauftemperatur-Diagramm eines Heizkessels der Heizung aus 1;
• 3 ein Diagramm mit verschiedenen Vorlauftemperatur-Rücklauftemperatur-Funktionen;
• 4 ein Diagramm mit einer bestimmten Vorlauftemperatur-Rücklauftemperatur-Funktion;
• 5 ein erstes konkretes Fallbeispiel zur Darstellung der Durchführung des hier beschriebenen Verfahrens;
• 6 ein zweites konkretes Fallbeispiel zur Darstellung der Durchführung des hier beschriebenen Verfahrens;
• 7 ein Ablaufdiagramm des hier beschriebenen Verfahrens, sowie
• 8 eine Messvorrichtung.

Further features and details emerge from the following description, in which - if necessary with reference to the drawing - at least one exemplary embodiment is described in detail. Described and / or illustrated features form the subject matter, either individually or in any meaningful combination, if appropriate also independently of the claims, and in particular can also be the subject of one or more separate applications. Identical, similar and / or functionally identical parts are provided with the same reference symbols. The following schematically show:

• 1 a house with a heater;
• 2 a nominal return temperature diagram of a heating boiler 1 ;
• 3 a diagram with different flow temperature-return temperature functions;
• 4 a diagram with a certain flow temperature-return temperature function;
• 5 a first concrete case example to illustrate the implementation of the method described here;
• 6 a second concrete case example to illustrate the implementation of the method described here;
• 7 a flowchart of the method described here, and
• 8th a measuring device.

1 shows a house 2 with a heater 4 (framed with dashed lines).

The heating system 4 has a boiler 6 with a burner 8th and a pump 10 on. burner 8th and pump 10 are controlled by a control unit 12 controlled. The control unit 12 serves, among other things, the burner 8th switch on and off, in some embodiments regulate the burner output and the pump 10 to control or regulate.

Is by the control unit 12 a heating requirement in the house 2 determined, the control unit is activated 12 the burner 8th and leaves the pump 10 start, so that heated heating water through a heating circuit 14 to radiators 16 . 18 . 20 is transported and there can heat the rooms in which the radiators 16 . 18 . 20 are arranged. The radiators 16 . 18 . 20 give off the heat of the heating water via heat exchange surfaces due to the temperature gradient between the heat exchange surface and the room to the respective room, whereby the heating water cools down and with a cooler return temperature to the burner 8th is transported back.

The heating circuit 14 is on a distributor 22 in partial heating circuits 14.1 . 14.2 and 14.3 divided, the partial heating circuit 14.1 to supply the radiator 16 , the partial heating circuit 14.2 to supply the radiator 18 and the partial heating circuit 14.3 to supply the radiator 20 serves. Downstream of the radiators 16 . 18 . 20 is a merge 24 provided the partial heating circuit 14.1 . 14.2 and 14.3 bundles before the heating circuit 14 back in the boiler 6 empties.

The control unit 12 has a processor 26 and a memory 28 on. The processor 26 is used to perform various calculations. The memory 28 is used to save and read out an operating program as well as various functions and / or parameters. The control unit 12 also has a clock 30 on. With the help of the clock 30 regular measurement cycles, in the exemplary embodiment described here, can be started every 6 hours.

The control unit 12 is with an outside temperature sensor 32 , a flow temperature sensor 34 and a return temperature sensor 36 connected. As shown in more detail in connection with the following figures, the control unit uses 12 the sensor information of the sensors 32 . 34 . 36 for hydraulic and thermal optimization of the heating 4 ,

With the boiler 6 it can be a boiler known in the prior art that is provided by the control unit 12 is regulated.

2 shows a nominal return temperature diagram of the boiler 6 the heater 4 ,

A 5 ° C grid is drawn in the diagram, the abscissa and ordinate intersect at 20 ° C. A border line 38 shows the theoretical maximum of the possible return temperature RLT on. The diagram applies to a room temperature of 20 ° C.

There are several points in the diagram 40.1 to 40.5 shown, each representing triples of values, namely ( 35 . 28 . 20 ) for triples of values 40.1 , where the first value is the nominal flow temperature VLT-rated , the second value is the nominal return temperature RLT -Nom and the third value indicates the room temperature. The other triples of values are ( 55 . 45 . 20 ) (Triplet of values 4.2 ), ( 70 . 55 . 20 ) (Triplet of values 4.3 ), ( 75 . 65 . 20 ) (Triplet of values 4.4 ) such as ( 90 . 70 . 20 ) (Triplet of values 4.5 ). The triplet of values 4.1 is used for surface heating such as floor heating, the triple value 4.2 . 4.3 and 4.4 for radiators and the triple value 4.5 for high temperature radiators in poorly or not insulated houses. The triplet of values for the specified values 4.1 to 4.5 becomes the nominal output of the radiators 16 . 18 . 20 reached.

3 shows a diagram with different flow temperature-return temperature functions 42.1 . 42.2 and 42.3 ,

The function 42.1 shows a logarithmic function of the form f (x) = a * In (x) + b. The function 42.2 is a linear function of the form f (x) = a * x + b. The function 42.3 is an exponential function of the form f (x) = a * e ^{(b * x)} .

In addition to the functions shown here 42.1 to 42.3 value tables or maps are also possible. The functions too 42.1 to 42.3 can be stored in the form of tables of values 28 be filed.

The function to be used 42.1 to 42.3 depends on the specific technical conditions of the heating 4 and can be determined or approximated by professional calculation or experimentally.

4 shows a diagram with the flow temperature-return temperature function 42.2 ,

The following is the principle using the linear function 42.2 explained. A domain 44 is due to the relevant flow temperature values VLT intended for heating systems, i.e. approx. 20 ° C to approx. 100 ° C. The domain 44 is down by a comfort temperature KT , which represents the highest desired temperature in the rooms, and is limited by the nominal return temperature RLTnenn of the respectively installed heat sinks.

• - a: die Steigung der Funktion kann zwischen Null und Eins liegen;
• - b: das absolute Glied wird in Abhängigkeit von a ausgeführt zu b = (1 - a) * KT.

The coefficients of the linear function 42.2 , which is structured according to the scheme f (x) = a * x + b, are specified for the task as follows:

• - a: the slope of the function can be between zero and one;
• - b: the absolute term is executed depending on a to b = (1 - a) * KT.

The resulting function is: RLToptimal = a * VLT + (1 - a) * KT.

The following table contains optimal return temperature values for a from 0.0 to 0.6 and a comfort temperature ( KT ) of 25 ° C and is suitable for a heating system with heat sinks 70/55/20.

The coefficients 0.0 and 0, 6 indicate the limits of the value range. Smaller coefficients support the calorific value effect better, larger coefficients are used with the same design of the heat sinks (all quotients of heating output and heating load are each the same).

5 shows a first concrete case example to illustrate the implementation of the method described here.

First, the return temperature sensor 36 measured return temperature RLT compared with an optimal return temperature RLToptimal. The measurement takes place at an outside temperature AT of 5 ° C. According to the heating curve HK becomes a flow temperature VLT set from 45 ° C. As a comfort temperature KT 25 ° C are specified.

At this flow temperature VLT arises on the basis of the flow temperature-return temperature function 42.2 an optimal return temperature RLT optimal of 33 ° C: $$\text{RLToptimal}=0.4*45°\text{C}+\left(1-0.4\right)*25°\text{C}=33°\text{C},$$

The measured return temperature RLT is however 29 ° C. According to the procedure described here, the flow temperature is now VLT through the control unit 12 lowered.

The heating curve HK is by means of two values in the control unit 12 deposited. Two representations are common: the specification of the base point FP and slope or flow temperatures at the design outside temperature ( AAT ) and heating limit temperature ( HGT ). In the example here these are: base point 15 / 33 with a slope -1.23; or: 15/33 and -15/70.

The relevant outside temperature range can be divided into two areas. In the warm area, i.e. at higher outside temperatures AT , becomes the base FP or the flow temperature VLT at the heating limit temperature HGT customized. The flow temperature VLT but the comfort temperature is allowed there KT not fall below, otherwise the room can no longer be heated to comfort temperature.

In the cold area, i.e. with low outside temperatures, the slope or the flow temperature at the design outside temperature AAT customized. Here the flow temperature is at the base point or at the heating limit temperature HGT (33 ° C) lowered.

A lowering of the flow temperature VLT by changing the heating curve HK causes a reduction in the heating output of the heating 4 , In order to be able to provide the necessary heat output, there is a mass flow of the heating water by increasing the pump output of the pump 10 elevated. As a result, the flow temperature VLT as well as the optimal return temperature RLT optimally, whereby at the same time it is to be expected that the return temperature RLT due to the faster flow of the heating water through the radiators 16 to 20 increases so that the real return temperature value RLT the optimal return temperature value RLToptimal. Will the appropriate parameters VLT and mass flow is not reached for a given iteration step, a further iteration step takes place until the return temperature has reached RLT has sufficiently approximated the optimal return temperature RLT. The permissible blurring can be in the control unit 12 be stored and be, for example, ± 1 ° C or another upper limit, ± 2 ° C, ± 3 ° C, ± 4 ° C, ± 5 ° C or an intermediate value.

This will make the heater 4 operated with optimized efficiency after one or more iteration steps. The new heating curve HK is in memory 28 the control unit 12 stored.

6 shows a second specific case example to illustrate the implementation of the method described here.

After a few iteration steps, the control unit 12 the heating curve HK at the heating limit temperature HGT lowered from 15 ° C to 27 ° C. At one in 6 The assumed outside temperature of -5 ° C is a flow temperature VLT of 55 ° C. The optimal return temperature RLToptimal is calculated on the basis of 5 shown formula at 37 ° C. The measured return temperature RLT is 39 ° C in the present case. The heating curve HK can adjust the slope and with it the flow temperature VLT can be increased with reduced pump output.

7 shows a flow chart of the method described here.

The first step is heating 4 initialized. Doing so in the memory 28 Operating parameters of the design outside temperature AAT , Heating limit temperature HGT , Comfort temperature KT , Pitch a as well as a tolerance ε stored.

After starting the heating 4 become outside temperature AT , Flow temperature VLT and return temperature RLT using the appropriate sensors 32 . 34 . 36 measured.

Then an optimal return temperature RLToptimal in accordance with the 5 formula specified.

The next step is to check whether the return temperature RLT is greater than the optimal return temperature RLT optimal plus the tolerance ε , If this is the case, the heating curve HK lowered and the mass flow increased. The next measurement cycle is then waited for. The tolerance ε is 1 ° C in the present case, but can alternatively be ± 2 ° C, ± 3 ° C, ± 4 ° C, ± 5 ° C or an intermediate value.

If this is not the case, it is checked whether the return temperature RLT is lower than the optimal return temperature RLT optimal minus the tolerance ε , If this is the case, the heating curve is raised and the mass flow is reduced. The next measurement cycle is then waited for.

In equivalent embodiments, the two method steps described above can be interchanged.

If this is not the case, the next cycle is waited for. The waiting time here is 24 hours. During this time, the overall system has time to stabilize.

The optimization steps of the process converge. The heating curve is optimized to the lowest flow temperatures, which take all relevant issues into account. Energy consumption is reduced to what is necessary for comfort, as are energy losses.

8th shows a measuring device 50 ,

The measuring device 50 corresponds essentially to the measuring and comparative part of the control unit described above 12 ,

The measuring device 50 has an outside temperature sensor 51 , a flow temperature sensor 52 and a return temperature sensor 54 on, which can be connected to a temperature control device, for example a heater. Outside temperature sensor 51 , Flow temperature sensor 52 and return temperature sensor 54 are by means of a cable 56 with a computing unit 58 connected in a housing 60 the measuring device 50 is arranged.

In the case 60 are also one with the computing unit 58 connected storage 61 , an ad 62 and a keyboard 64 intended.

Furthermore, one is on a cable 66 arranged interface 68 provided for reprogramming the temperature control device.

With the keyboard 66 can be a heating curve HK in usual parameterizations and a comfort temperature KT can be entered.

The computing unit 58 is intended for calculating the optimal return temperature RLT optimal from measured values for the supply temperature VLT and return temperature RLT as well as the heating curve, e.g. over the slope a and a comfort temperature KT ,

The ad 62 is used to display the keyboard 66 made entries and to display deviations between the return temperature RLT and optimal return temperature RLToptimal and / or to display instructions for setting one with the measuring device 50 measured temperature control system.

Although the subject matter has been illustrated and explained in more detail by means of exemplary embodiments, the invention is not restricted by the disclosed examples and other variations can be derived therefrom by a person skilled in the art. It is therefore clear that there are a variety of possible variations. It is also clear that exemplary embodiments are only examples which are not to be interpreted in any way as a limitation of the scope, the possible applications or the configuration of the invention. Rather, the preceding description and the description of the figures enable the person skilled in the art to specifically implement the exemplary embodiments, the person skilled in the art being able to make various changes, for example with regard to the function or the arrangement of individual elements mentioned in an exemplary embodiment, in knowledge of the disclosed inventive concept, without the To leave the scope of protection, which is defined by the claims and their legal equivalents, such as further explanation in the description.

LIST OF REFERENCE NUMBERS

2

House

4

heater

6

boiler

8th

burner

10

pump

12

control unit

14

heating circuit

14.1, 14.2, 14.3

Teilheizkreislauf

16

radiator

18

radiator

20

radiator

22

distributor

24

together

26

processor

28

Storage

30

Clock

32

Outside temperature sensor

34

Flow temperature sensor

36

Return temperature sensor

38

boundary line

40.1 - 40.5

triplets

42.1 - 42.3

Flow temperature Return temperature function

44

domain

50

measuring device

51

Outside temperature sensor

52

Flow temperature sensor

54

Return temperature sensor

56

electric wire

58

computer unit

60

casing

61

Storage

62

display

64

keyboard

66

electric wire

66

interface

ε

tolerance

a

pitch

AT

outside temperature

AAT

Design outdoor temperature

FP

nadir

KT

comfort temperature

HGT

Heating limit

HK

heating curve

RLT

Return temperature

RLT-rated

Nominal return temperature

RLToptimal

optimal return temperature

VLT

flow temperature

VLT-rated

Forward nominal temperature

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102012020750 B4 [0013]
• DE 102012020750 B1 [0014]

Claims (13)

Method for operating a temperature control system (4) for at least one interior, with at least one heat source (8), at least one heat sink (16, 18, 20), the heat source (8) and heat sink (16, 18, 20) via a closed fluid circuit (14) are flow-connected to one another, and at least one pump (10) arranged in the fluid circuit (14) for conveying the fluid in the fluid circuit (14), with the following steps: - Measuring a flow temperature (VLT) between the at least one heat source (8) and the at least one heat sink (16, 18, 20), - Measuring a return temperature (RLT) between the at least one heat sink (16, 18, 20) and the heat source (8), the return temperature (RLT) in the presence of several heat sinks (16, 18, 20) behind a merging (24) of several Partial fluid circuits (14.1, 14.2, 14.3) is measured, - measuring an outside temperature (AT), - supplying the measured values of the flow temperature (VLT), the return temperature (RLT) and the outside temperature (AT) to a control unit (12) of the temperature control system (4), - The control unit (14) determines an optimal return temperature (RLToptimal) from the measured values of the flow temperature (VLT), the return temperature (RLT) and the outside temperature (AT), - The control unit (12) adjusts the flow temperature (VLT) and / or a fluid mass flow by changing the delivery rate of the pump (10) when a deviation between the measured return temperature (RLT) and the optimal return temperature (RLToptimal) is adjusted, whereby - If a determination of the return temperature (RLT) and the optimal return temperature (RLToptimal) no adjustment of the flow temperature (VLT) or the fluid mass flow takes place by the control unit (12), the process being repeated at a predetermined control interval. Procedure according to Claim 1 , whereby, - if the return temperature (RLT) is below the optimal return temperature (RLToptimal), the flow temperature (VLT) is reduced by a predetermined amount and the fluid mass flow (FMS) is increased by a predetermined amount, or whereby, - if the return temperature (RLT) is above the optimal return temperature (RLToptimal), the flow temperature (VLT) is increased and the mass flow is reduced. Procedure according to Claim 1 or 2 , with a regulation interval between 6 h and 24 h, in particular between 12 h and 24 h, in particular 24 h, or a multiple of 24 h. Method according to one of the preceding claims, wherein parameters of a heating curve (HK) and / or an optimal flow temperature-return temperature function (VRF) are stored in the control unit (12) when the temperature control system (4) is initiated. Procedure according to Claim 4 , where the heating curve (HK) is determined when a match between the return temperature (RLT) and the optimal return temperature (RLToptimal) is adjusted such that the current flow temperature (VLT) lies on the heating curve (HK). Procedure according to Claim 5 , the heating curve (HK) being stored in the control unit (12) by two values (FP, S). Method according to one of the preceding claims, wherein the flow temperature-return temperature function is a linear function (42.2), an exponential function (42.3), a logarithmic function (42.1) or a map. Temperature control system with at least one heat source (8) and at least one heat sink (16, 18, 20), the heat source (8) and heat sink (16, 18, 20) being fluidly connected to one another via a closed fluid circuit (14), and at least one in the fluid circuit (14) arranged pump (10) for conveying a fluid in the fluid circuit (14), a control unit (12) being provided which is connected in a signal-conducting manner to a flow temperature sensor (34), a return temperature sensor (36) and an outside temperature sensor (32), wherein the control unit (12) is set up to control the heat source (8) and the pump (10), the control unit (12) having a clock (30) and a writable memory (28), the control unit (12) being set up for this is to adjust control parameters depending on the flow temperature (VLT), return temperature (RLT), outside temperature (AT) and pump parameters and store them in the memory (28). Temperature control system after Claim 8 , wherein the control unit (12) is set up to control parameters according to the method according to one of the Claims 1 to 7 to determine. Temperature control system after Claim 8 or 9 The control unit (12) has a processor (26) which is connected to a memory (28), a computer program being stored in the memory (28) which, when loaded and executed in the processor (26), the procedure according to one of the Claims 1 to 7 performs. Measuring device with an outside temperature sensor (32), a flow temperature sensor (52), a return temperature sensor (54) and an input device (64) for inputting a slope (a) and a comfort temperature (KT), a computing unit (58) being provided which consists of Measured values for flow temperature (VLT) and return temperature (RLT) as well as entered slope (a) and comfort temperature (KT) for calculating an optimal return temperature (RLToptimal) are set up, whereby a display (62) is provided, which shows deviations between return temperature ( RLT) and optimal return temperature (RLToptimal) and / or instructions for setting a temperature control system measured with the measuring device (50). Measuring device after Claim 11 A memory (61) connected to the computing unit (58) is provided, on which is stored a computer program product which, when loaded and executed by a processor, carries out the method according to one of the Claims 1 to 7 performs. Measuring device after Claim 11 or 12 An interface (66) is provided for connection to a control unit of a temperature control system, with operating parameters for storage in the temperature control system being transferable via the interface (66).

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