DE102014007598A1 - Method and arrangement for reducing return temperature levels in heating systems with any number of heating circuits - Google Patents

Abstract

The invention relates to a method for reducing return temperature levels in a heating system with any number of heating circuits (HK (1)... HK (n) with n> 1), in which a separation of Heizwasserrücklaufvolumenströme with respect to their return temperature levels in at least two return temperature collector (2, 3, 4), these temperature-dependent separated Heizwasserrücklaufvolumenströme in the at least two return temperature collectors (2, 3, 4) are used at least partially as a feed admixture for at least one of the heating circuits HK (x) that a desired flow temperature level using only a minimum flow volume flow from the heat generator is reached, all heating circuits (HK (1) ... HK (n)) can interact with each other if necessary, so that dynamic processes in the heating system, such as variable volume flows or temperature levels due to, for example, weather or use-related needs Schwa be compensated energetically cheaper than without the feed admixture from the at least two return temperature collectors (2, 3, 4). With the reduction of the return temperature levels in heating systems, an increase in the energy efficiency is to be achieved in particular for condensing boilers. The invention further relates to corresponding arrangements.

Description

The invention relates to the reduction of return temperature levels in heating systems with any number of heating circuits. For heating algae, the level of the return temperature is an essential factor for influencing the energy efficiency. Basically, the lower the return temperature level, the higher the energy efficiency that can be achieved. In particular, in condensing boiler systems, the achievement of a low return temperature levels is of great importance for obtaining a high level of energy efficiency.

Some systems with the aim of reducing the return temperature levels in heating systems are already known, for. B. DE 10 2006 020 822 A1 . DE 10 2006 017 286 B4 . DE 10 2008 013 124 A1 and DE 10 2010 010 088 A1 , However, in terms of functionality, these hitherto known solutions always relate to the combination of only a maximum of two heating circuits which interact directly with one another.

The object of the invention is therefore to provide a solution which achieves a reduction of return temperature levels in heating systems with any number of heating circuits by a suitable circuit arrangement of control and control valves and their regulation and control.

• – eine Separierung der Heizwasserrücklaufvolumenströme bezüglich ihrer Rücklauftemperaturniveaus in mindestens zwei Rücklauftemperatursammler erfolgt,
• – diese temperaturabhängig separierten Heizwasserrücklaufvolumenströme in den mindestens zwei Rücklauftemperatursammlern derart mindestens teilweise als Vorlaufbeimischung für mindestens einen der Heizkreise HK(x) eingesetzt werden, dass ein gewünschtes Vorlauftemperaturniveau unter Einsatz lediglich eines minimalen Vorlaufvolumenstroms aus dem Wärmeerzeuger erreicht wird, wobei
• – alle Heizkreise HK(1)...HK(n) bei Bedarf miteinander interagieren können, so dass dynamische Prozesse in der Heizungsanlage, wie etwa veränderliche Volumenströme oder Temperaturniveaus infolge zum Beispiel witterungs- bzw. nutzungsbedingter Bedarfsschwankungen, energetisch günstiger als ohne die Vorlaufbeimischung aus den mindestens zwei Rücklauftemperatursammlern ausgeglichen werden.

This object is achieved by a method for reducing return temperature levels in a heating system with any number of heating circuits HK (1) ... HK (n) with n> 1, in which

• A separation of the Heizwasserrücklaufvolumenströme with respect to their return temperature levels in at least two return temperature collector takes place,
• - This temperature-dependent separated Heizwasserrücklaufvolumenströme in the at least two return temperature collectors are at least partially used as a feed admixture for at least one of the heating circuits HK (x) that a desired flow temperature level is achieved using only a minimum flow volume flow from the heat generator, wherein
• - All heating circuits HK (1) ... HK (n) can interact with each other if necessary, so that dynamic processes in the heating system, such as variable volume flows or temperature levels due to, for example, weather or use-related fluctuations in demand, energetically cheaper than without the feed admixture be compensated from the at least two return temperature collectors.

Compared to the prior art, this invention stands out in particular to the effect that any number of heating circuits HK (x) of a heating system can be interconnected hydraulically so that all heating circuits are in hydraulic and regulatory interaction with each other, without being negative in terms of functionality and Hydraulic supply security influence. The basic principle of the invention lies in the temperature-dependent separation of the return flows of the individual heating circuits HK (x) of the heating system. These reflux streams are separated into at least two temperature ranges as described above. To increase the effect of the return temperature reduction, however, the separation of the return flows in at least three temperature levels is recommended. Thus, the return currents of the individual heating circuits are adjusted to a high temperature level (eg> 55 ° C), a medium temperature level (eg <55 ° C), depending on their temperature by using three-way changeover valves, temperature sensors and software-based control ° C,> 40 ° C) and a low temperature level (eg <40 ° C) are divided into three corresponding return headers. For the individual heating circuits, setpoint values for the flow temperatures are defined for each application and function (eg via a heating curve as a function of the outside temperature). With the knowledge of the individual flow temperature setpoints, a temperature-dependent supply of Heizwasservolumenströmen from the three return headers takes place as admixture to the respective flow rates of the individual heating circuits. Preferably, the admixing of Heizwasservolumenströmen from the high-temperature return header to the flow rate of the individual heating circuits. Thus, hot return water of a heating circuit is at least partially used as flow water for another heating circuit and thus achieved a gradual cooling of high-temperature return streams through a partial hydraulic series connection. The determination from which the return header heating water is taken, via the software-based control and control. This in turn controls three-way control valves, which determine the flow path of the heating water. These three-way control valves are already pre-regulated to flow temperature by mixing Heizwasservolumen streams from the return headers.

Preferably, therefore, the separation of the return flow rates from the individual heating circuits HK (x) in different temperature levels to at least two, preferably three, return collectors by means of three-way control valves, temperature sensor (s) and control technology (s).

Furthermore, the mixture of return flow rates from different return headers with different temperature levels for pre-regulation of the flow temperature of at least one heating circuit HK (x) by means of three-way control valves, temperature sensor (s) and control technology (s) is performed.

Independently of the above, two-way valves can be used instead of three-way valves for the temperature-dependent separation of the return flow rates and for the precontrol of the flow temperature. When using two-way valves results in a reduction in security of supply, as in a failure of the control system can interrupt the flow paths of the heating circuits. When using three-way valves, a flow path is always open for the individual heating circuits and the function of the heating system remains guaranteed. Furthermore, when using two-way valves on the flow side, no pre-regulation of the flow temperature is possible. The number of two-way valves per heating circuit corresponds to the number of return collectors both for the return volume flow separation and for the withdrawal to the feed admixture from the return collectors. For a number of three return collectors, therefore, three two-way valves for the return temperature separation and three two-way valves for the removal of feed admixture per heating circuit are required.

• – mindestens zwei Rücklauftemperatursammler, in denen eine Separierung der Heizwasserrücklaufvolumenströme bezüglich ihrer Rücklauftemperaturniveaus erfolgt, wobei
• – ein gewünschtes Vorlauftemperaturniveau unter Einsatz lediglich eines minimalen Vorlaufvolumenstroms aus dem Wärmeerzeuger erreicht wird, indem die temperaturabhängig separierten Heizwasserrücklaufvolumenströme in den mindestens zwei Rücklauftemperatursammlern mindestens teilweise als Vorlaufbeimischung für mindestens einen der Heizkreise HK(x) eingesetzt werden, und wobei
• – alle Heizkreise HK(1)...HK(n) bei Bedarf miteinander interagieren können, so dass dynamische Prozesse in der Heizungsanlage, wie etwa veränderliche Volumenströme oder Temperaturniveaus infolge von z. B. witterungs- bzw. nutzungsbedingter Bedarfsschwankungen energetisch günstiger als ohne die Vorlaufbeimischung aus den mindestens zwei Rücklauftemperatursammlern ausgeglichen werden.

The object of the invention is also achieved by an arrangement for reducing return temperature in a heating system with any number of heating circuits (HK (1) ... HK (n) with n> 1), comprising

• - At least two return temperature collector, in which a separation of Heizwasserrücklaufvolumenströme takes place with respect to their return temperature levels, wherein
• - A desired flow temperature level is achieved using only a minimum flow volume flow from the heat generator by the temperature-dependent separated Heizwasserrücklaufvolumenströme in the at least two return temperature collectors at least partially used as a feed admixture for at least one of the heating circuits HK (x), and wherein
• - All heating circuits HK (1) ... HK (n) can interact with each other if necessary, so that dynamic processes in the heating system, such as variable volume flows or temperature levels due to z. B. weather or use-related fluctuations in demand energetically cheaper than without the flow mixture from the at least two return temperature collectors are compensated.

In principle, the explanations given above on the inventive method also analogously apply to the arrangement, so that the same are not repeated here for redundancy reasons.

In a first embodiment of the arrangement according to the invention the separation of the return flow rates from the individual heating circuits HK (x) takes place in different temperature levels on at least two, preferably three, return collectors by means of three-way control valves, temperature sensor (s) and control engineering (s) ,

Furthermore, the mixture of return flow rates from different return headers with different temperature levels for pre-regulation of the flow temperature of at least one heating circuit HK (x) by means of three-way control valves, temperature sensor (s) and control technology (s) is performed.

Finally, in the arrangement for the temperature-dependent separation of the return flow rates and for the precontrol of the flow temperature instead of three-way valves two-way valves can be used. When using two-way valves results in a reduction in security of supply, as in a failure of the control system can interrupt the flow paths of the heating circuits. When using three-way valves, a flow path is always open for the individual heating circuits and the function of the heating system remains guaranteed. Furthermore, when using two-way valves on the flow side, no pre-regulation of the flow temperature is possible. The number of two-way valves per heating circuit corresponds to the number of return collectors both for the return volume flow separation and for the withdrawal to the feed admixture from the return collectors. For a number of three return collectors, therefore, three two-way valves for the return temperature separation and three two-way valves for the withdrawal to the feed admixture per heating circuit are required.

The invention will be explained in more detail with reference to the accompanying drawings.

1 shows an exemplary circuit diagram for both the inventive method, as well as for the inventive arrangement. In the following, the drawing is used to explain the inventive method for reducing return temperature levels in a heating system with five heating circuits HK (1) ... HK (n) with n = 5.

As in 1 it can be seen, there is a separation of Heizwasserrücklaufvolumenströme with respect to their return temperature in at least two return temperature collectors 2 . 3 . 4 , These temperature-dependent separated Heizwasserrücklaufvolumenströme be in the at least two return temperature collectors 2 . 3 . 4 at least partially used as a feed admixing for at least one of the heating circuits HK (x) that a desired flow temperature level using only a minimum flow volume flow from the heat generator 12 is reached. In this case, all heating circuits HK (1) ... HK (5) interact with each other if necessary, so that dynamic processes in the heating system, such as variable volume flows or temperature levels due to, for example, weather or use-related demand fluctuations energetically favorable than without the feed admixture the at least two return temperature collectors 2 . 3 . 4 be compensated. Furthermore there are circulating pumps 13 , Heating circuit consumer 14 , Mixer motors or servomotors on the valves (characterized by small filled circles), temperature sensors (characterized by small unfilled circles) and other components, as will be explained below. Compared to the prior art, this invention stands out in particular to the effect that any number of heating circuits HK (x) of a heating system can be interconnected hydraulically such that all heating circuits HK (x) are in hydraulic and regulatory interaction with each other, without negatively Sense of functionality and security of supply to influence hydraulically. The basic principle of the invention lies in the temperature-dependent separation of the return flows of the individual heating circuits HK (x) of the heating system. Thus, the return currents of the individual heating circuits HK (x) depending on their temperature by using (motor) three-way switching valves 5 , Temperature sensors 6 (for the return) and a software-based regulation and control 7 to a high temperature level (eg> 55 ° C), a medium temperature level (eg <55 ° C,> 40 ° C) and a low temperature level (eg <40 ° C) to three corresponding return headers 2 . 3 . 4 (in this order, ie high temperature, medium temperature and low temperature) split.

For the individual heating circuits, setpoint values for the flow temperatures are defined for each application and function (eg via a heating curve as a function of the outside temperature). With knowledge of the individual flow temperature setpoint values, a temperature-dependent supply of heating water flow rates from the three return headers takes place 2 . 3 . 4 as an admixture to the respective flow streams of the individual heating circuits HK (x). Preferably, the admixture of Heizwasservolumenströmen from the high-temperature return heap 2 to the flow volumes of the individual heating circuits HK (x). Thus, hot return water of a heating circuit HK (x) is at least partially used as flow water for another heating circuit HK (y) and thus achieved a gradual cooling of high-temperature return streams through a partial hydraulic series connection. The determination of which the return collector 2 . 3 . 4 Heating water is removed, via the software-based control and control 7 , This in turn controls (engine) three-way control valves 8th , which determine the flow path of the heating water. About these three-way control valves 8th Pre-regulation to the flow temperature already takes place by heating water volume flows from the return collectors 2 . 3 . 4 be mixed.

Preferably, therefore, the separation of the return flow rates from the individual heating circuits HK (x) takes place in different temperature levels on at least two, preferably three, return headers 2 . 3 . 4 by means of motor three-way changeover valves 5 , Temperature sensor (s) 6 (Return) as well as control technology (s) 7 , The control technology (s) 7 can z. B. be embodied as a PC with software or as integrated circuits.

Furthermore, the mixture of return flow rates from different return headers 2 . 3 . 4 with different temperature levels for the precontrol of the flow temperature of at least one heating circuit HK (x) by means of three-way control valves 8th , Temperature sensor (s) 11 (for return admixture) as well as control technology (s) 7 carried out.

In a first application example for a heating circuit HK (x), z. B. HK (1), a setpoint for the flow temperature of 50 ° C and in (high temperature) return collector 2 a temperature level of 55 ° C. In the (medium temperature) return collector 3 a temperature level of 45 ° C is available. Then advantageously via the three-way control valves 8th a mixture of these heating water flows from the (high temperature) return collector 2 and the (medium temperature) return collector 3 in equal parts, namely at a temperature level of 50 ° C. This would be no further admixture of hot flow water from the heat generator 12 via the three-way control valve 9 necessary.

In a second application example is for a heating circuit HK (x), z. B. HK (2), a flow temperature of 65 ° C and required by the heat generator 12 becomes a flow temperature level in the flow distributor 1 offered by 85 ° C. Then, according to the invention via the three-way valve 9 a heating water mixture from the high-temperature return collector 2 and the flow rate flow from the heat generator 12 , These are the three-way valves 8th through the regulation and control 7 so that only heating water from the high-temperature return collector 2 can be removed.

To avoid a mutual hydraulic influence of the individual heating circuits with each other, the return headers 2 . 3 . 4 preferably together via a hydraulic compensating line 10 connected. This hydraulic compensation line 10 acts as a hydraulic switch to compensate for flow differences in the individual return headers 2 . 3 . 4 and thus as hydraulic decoupling.

The above explanations and exemplary embodiments of the method according to the invention also apply mutatis mutandis to the inventive arrangement and should therefore not be repeated here again.

With the above-described methods and arrangements is achieved what was desired: An innovative solution was created in which by a suitable circuit arrangement of control and control valves and their regulation and control, a reduction of return temperature levels in heating systems is achieved with any number of heating circuits. Thus, in particular dynamic processes in such heating systems, such as variable volume flows or temperature levels as a result of, for example, weather or usage-related fluctuations in demand, can be compensated for in terms of energy and in terms of energy known from the prior art.

LIST OF REFERENCE NUMBERS

1

Flow manifold

2

Return collector high temperature

3

Return collector middle temperature

4

Return collector low temperature

5

Motor Three-way diverter valve

6

Temperature sensor return

7

Software-based regulation and control

8th

Motor Three-way control valve

9

Motor Three-way control valve

10

hydraulic compensation line

11

Temperature sensor return admixture

12

heat generator

13

circulating pump

14

Heizkreisverbraucher

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely 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.

Cited patent literature

• DE 102006020822 A1 [0002]
• DE 102006017286 B4 [0002]
• DE 102008013124 A1 [0002]
• DE 102010010088 A1 [0002]

Claims (8)

Method for reducing return temperature levels in a heating system with an arbitrary number of heating circuits (HK (1) ... HK (n) with n> 1), in which - a separation of the heating water return volume flows with respect to their return temperature levels in at least two return temperature collectors ( 2 . 3 . 4 ) takes place, - this temperature-dependent separated Heizwasserrücklaufvolumenströme in the at least two return temperature collectors ( 2 . 3 . 4 ) are at least partially used as a feed admixture for at least one of the heating circuits HK (x) that a desired flow temperature level is achieved using only a minimum flow volume flow from the heat generator, where - all heating circuits (HK (1) ... HK (n) ) can interact with one another as required, so that dynamic processes in the heating system, such as variable volume flows or temperature levels, are energetically more favorable than without the feed mixture from the at least two return temperature collectors ( 2 . 3 . 4 ). A method according to claim 1, characterized in that the separation of the return flow rates from the individual heating circuits HK (x) in different temperature levels on at least two, preferably three, return collector ( 2 . 3 . 4 ) by means of three-way control valves ( 5 ), Temperature sensor (s) ( 6 ) and control engineering (s) ( 7 ) he follows. A method according to claim 1 or 2, characterized in that the mixture of return flow rates from different return headers ( 2 . 3 . 4 ) with different temperature levels for the precontrol of the flow temperature of at least one heating circuit HK (x) by means of three-way control valves ( 8th ), Temperature sensor (s) ( 11 ) and control engineering (s) ( 7 ) he follows. Method according to one of claims 2 or 3, characterized in that for the temperature-dependent separation of the return flow rates and for the precontrol of the flow temperature in place of three-way valves ( 5 . 8th ) Two-way valves are used. Arrangement for reducing return temperature levels in a heating system with any number of heating circuits (HK (1) ... HK (n) with n> 1), comprising - at least two return temperature collectors ( 2 . 3 . 4 ), in which a separation of Heizwasserrücklaufvolumenströme with respect to their return temperature levels, wherein - a desired flow temperature level is achieved using only a minimum flow volume flow from the heat generator by the temperature-dependent separated Heizwasserrücklaufvolumenströme in the at least two return temperature collectors ( 2 . 3 . 4 ) can be used at least partially as a feed admixture for at least one of the heating circuits HK (x), wherein - all heating circuits (HK (1) ... HK (n)) can interact with each other if necessary, so that dynamic processes in the heating system, such as variable volume flows or temperature levels energetically more favorable than without the feed admixture from the at least two return temperature collectors ( 2 . 3 . 4 ). Arrangement according to claim 5, characterized in that the separation of the return flow rates from the individual heating circuits HK (x) in different temperature levels on at least two, preferably three, return collector ( 2 . 3 . 4 ) by means of three-way control valves ( 5 ), Temperature sensor (s) ( 6 ) and control engineering (s) ( 7 ) he follows. Arrangement according to claim 5 or 6, characterized in that the mixture of return flow rates from different return headers ( 2 . 3 . 4 ) with different temperature levels for the precontrol of the flow temperature of at least one heating circuit HK (x) by means of three-way control valves ( 8th ), Temperature sensor (s) ( 11 ) and control engineering (s) ( 7 ) he follows. Arrangement according to one of claims 6 or 7, characterized in that for the temperature-dependent separation of the return flow rates and for the precontrol of the flow temperature in place of three-way valves ( 5 . 8th ) Two-way valves are used.

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