Heating system and method for operating a heating system

Abstract

The invention relates in particular to a method for operating a heating system, in which: - a heating circuit medium is guided in an overall heating circuit (1); - the heating circuit medium is guided in a first and a second sub-heating circuit (1.1, 1.2), which are connected to the overall heating circuit (1); - a heating circuit medium volumetric flow through the sub-heating circuits (1.1, 1.2) is defined by means of a valve device (2); - the heating circuit medium volumetric flow is fed to the second sub-heating circuit (1.2) via a first connection (2.1) of the valve device (2) and / or guided via a second connection (2.2) of the valve device (2); and - the heating circuit medium volumetric flow is fed via a connection (2.3) of the valve device (2), which connection is connected to the overall heating circuit (1), wherein, if necessary, the heating circuit medium volumetric flow is fed to the first sub-heating circuit (1.1) via the second connection (2.2) of the valve device (2), and wherein, if necessary, the heating circuit medium volumetric flow is delivered via a bypass (7) provided on the second sub-heating circuit (1.2). According to the invention, if necessary the heating circuit volumetric flow is guided through a buffer store (8) at the bypass (7).

Description

[0001] The invention relates to a heating system according to the preamble of patent claim 1 and a method for operating a heating system according to the preamble of patent claim 7.

[0002] A heating system of the type mentioned above is known from patent document CH 556 513 A. In this system, a heat consumer, namely the space heater with reference numeral 17, is arranged in particular on the first partial heating circuit. Furthermore, a heat consumer, namely the boiler with reference numeral 19, is also arranged on the second partial heating circuit. Finally, this solution also provides a bypass, namely the mixing line with reference numeral 21.

[0003] Another heating system of this type is known from patent document EP 2 530 391 A1. This consists of an overall heating circuit carrying a heating circuit medium and a first and a second partial heating circuit, each connected to the overall heating circuit and also carrying the heating circuit medium. A valve device is provided for determining a heating circuit medium volume flow through the partial heating circuits, the valve device having a first connection connected to the second partial heating circuit, a second connection, and a third connection connected to the overall heating circuit. In procedural terms, in this solution, a heating circuit medium is carried in an overall heating circuit. Furthermore, the heating circuit medium is carried in a first and a second partial heating circuit connected to the overall heating circuit. Furthermore,A valve device determines a heating circuit medium volume flow through the partial heating circuits. Furthermore, the heating circuit medium volume flow is supplied to the second partial heating circuit via a first connection of the valve device and / or via a second connection of the valve device. Furthermore, the heating circuit medium volume flow is supplied to the valve device via a connection connected to the overall heating circuit. In this solution, the second connection of the valve device is connected to a mixer line, which essentially connects the flow branch of the overall heating circuit to its return branch. Other heating systems of this type are known from EP 2 306 096 A1 or EP 3 594 575 A1.

[0004] The invention is based on the object of improving a heating system and a method for operating a heating system of the type mentioned above. In particular, a particularly well- and easily controllable heating system with (at least) two partial heating circuits is to be created.

[0005] This problem is solved objectively with a heating system of the type mentioned above by the features listed in the characterizing part of patent claim 1. In terms of method, this problem is solved by the features listed in the characterizing part of patent claim 7.

[0006] According to the invention, a buffer storage tank is provided in the second partial heating circuit. The method according to the invention provides that the heating circuit medium flow is directed through a buffer storage tank at the bypass when required.

[0007] In other words, the solution according to the invention is distinguished from the aforementioned prior art by the fact that the second partial heating circuit can be controlled completely independently of the first partial heating circuit thanks to the inventive arrangement of the valve device and the inventive control of the heating circuit medium volume flow. As will be explained in more detail below, thanks to the solution according to the invention, it is even possible to essentially control the temperature of the second partial heating circuit solely via its pump, without affecting the first partial heating circuit.

[0008] Other advantageous developments of the heating system according to the invention or of the method according to the invention for operating a heating system emerge from the dependent patent claims.

[0009] The heating system according to the invention or the method according to the invention for operating a heating system is explained in more detail below with reference to the drawings of various embodiments. It shows schematically

[0010] Figure 1 shows a first representation of the heating system according to the invention; Figure 2 shows a second representation of the heating system according to the invention, which is hydraulically similar to that according to Figure 1 and Figure 3 shows the heating system known from the prior art mentioned at the beginning (EP 2 530 391 A1) (shown in simplified form).

[0011] The Figures 1 and 2The heating system shown consists in a manner known per se of an overall heating circuit 1 carrying a heating circuit medium and a first and a second partial heating circuit 1.1, 1.2, each connected to the overall heating circuit 1 and also carrying the heating circuit medium, wherein a valve device 2 is provided for determining a heating circuit medium volume flow through the partial heating circuits 1.1, 1.2, wherein the valve device 2 has a first connection 2.1 connected to the second partial heating circuit 1.2, a second connection 2.2 and a third connection 2.3 connected to the overall heating circuit 1.

[0012] As further evidenced by the Figures 1 and 2As can be seen, it is particularly preferably provided that the overall heating circuit 1 has a flow branch 1.0.1 and a return branch 1.0.2. Looking at it in somewhat more detail, it is further preferably provided that the flow branch 1.0.1 and the return branch 1.0.2 are connected to one another via a heat exchanger 9 on the one hand and via the first and second partial heating circuits 1.1, 1.2 on the other. The said heat exchanger 9, which ultimately preferably has four connections (not separately shown) and is designed as a plate heat exchanger, is in turn designed, for example, as a condenser of a heat pump.

[0013] Furthermore, it is provided that at least one heat consumer 11, particularly preferably an underfloor heating system or a radiator, is arranged on the first partial heating circuit 1.1. As a rule, a whole series of such heat consumers are provided.

[0014] Furthermore, it is provided that a partial heating circuit pump 4 and at least one heat consumer 5, particularly preferably an underfloor heating system or a radiator, are arranged on the second partial heating circuit 1.2. Here, too, several such heat consumers are generally provided.

[0015] In addition to the said partial heating circuit pump 4, the solution according to the invention also has another pump, but not - as in the solution according to Figure 3 - second partial heating circuit pump 10' on the first partial heating circuit 1.1, but a total heating circuit pump 10 arranged on the return line 1.0.2 of the total heating circuit 1. Furthermore, a bypass 7 is provided on the second partial heating circuit 1.2.

[0016] In procedural terms, as in the solution according to Figure 3, a heating circuit medium is guided in one or the overall heating circuit 1 in the solution according to the invention. In addition, the heating circuit medium is guided in a first and a second partial heating circuit 1.1, 1.2 connected to the overall heating circuit 1. Furthermore, a valve device 2 determines a heating circuit medium volume flow through the partial heating circuits 1.1, 1.2. Furthermore, the heating circuit medium volume flow is supplied to the second partial heating circuit 1.2 via a first connection 2.1 of the valve device 2 and / or via a second connection 2.2 of the valve device 2. In addition, the heating circuit medium volume flow is supplied to the valve device 2 via a connection 2.3 connected to the overall heating circuit 1.

[0017] Objectively speaking, it is further provided that the second connection 2.2 is connected to a feed 1.1.1 to the first partial heating circuit 1.1.

[0018] In procedural terms, it is also provided that, if required, the heating circuit medium volume flow is supplied to the first partial heating circuit 1.1 via the second connection 2.2 of the valve device 2.

[0019] This measure brings advantages over the Figure 3 The solution presented has, among other things, the considerable advantage that the amount of heat made available to the heat consumer 5 of the second partial heating circuit 1.2 can be controlled solely - and thus independently of the first partial heating circuit 1.1 - by means of the partial heating circuit pump 4. Or, expressed in other words: It is intended that a temperature usable at a heat consumer 5 of the second partial heating circuit 1.2 is controlled (solely) via a speed of a partial heating circuit pump 4 of the second partial heating circuit 1.2. In the solution according to Figure 3 This is not possible because the two pumps 4 and 10' influence each other.

[0020] For the concrete implementation of the invention, it is particularly preferred that the valve device 2 is arranged on the flow branch 1.0.1 of the overall heating circuit 1.

[0021] It is further particularly preferred that the valve device 2 guides the heating circuit medium, if required, either completely through the first partial heating circuit 1.1 or completely through the second partial heating circuit 1.2. Furthermore, in contrast to the solution according to Figure 3 and less fundamentally than described above - preferably provided that the valve device 2 is used to set a distribution of the heating circuit medium flowing in via the connection 2.3 to the connections 2.1, 2.2.

[0022] Furthermore, a line branch 3 with three line connections is particularly preferably provided on the return branch 1.0.2 of the overall heating circuit 1, wherein the first line connection 3.1 is hydraulically connected to the first partial heating circuit 1.1, the second line connection 3.2 is hydraulically connected to the second partial heating circuit 1.2 and the third line connection 3.3 is hydraulically connected to the return branch 1.0.2 of the overall heating circuit 1.

[0023] Furthermore, it is particularly preferred that a first, preferably valve-free, branch 6.1 be provided on the second partial heating circuit 1.2 in the flow direction of the heating circuit medium, on the one hand, upstream of the partial heating circuit pump 4 and upstream of the heat consumer 5, and on the other hand, a second, preferably valve-free, branch 6.2 be provided downstream of the partial heating circuit pump 4 and downstream of the heat consumer 5. Furthermore, as is particularly clear from the illustration according to Figure 2- a bypass 7 is provided on the first partial heating circuit 1.1. Furthermore, it is particularly preferred that the two branches 6.1, 6.2 are hydraulically connected to one another via the bypass 7.

[0024] In order to increase the volume of the bypass 7 and thus to improve the controllability of the second partial heating circuit 1.2, it is also provided that a buffer storage tank 8 is provided on the second partial heating circuit 1.2. It is particularly preferably provided that the second partial heating circuit 1.2 is provided with the buffer storage tank 8 which is hydraulically connected on the one hand to the first branch 6.1 and on the other hand to the second branch 6.2. This preferably has a volume of less than 30 liters, particularly preferably less than 20 liters. - Expressed in terms of the method, it is provided that the heating circuit medium volume flow is directed, if necessary, via a bypass 7 provided on the second partial heating circuit 1.2 and is guided there through a buffer storage tank 8.It is particularly preferred that a portion of the heating circuit medium volume flow guided through the buffer storage 8 is controlled by means of the valve device 2 and by means of a speed of a partial heating circuit pump 4 of the second partial heating circuit 1.2.

[0025] Furthermore, and in contrast to the solution according to Figure 3 (see especially the dashed lines in Figures 1 and 3) it is particularly preferred according to the invention that both the first partial heating circuit 1.1 and the second partial heating circuit 1.2, seen in the flow direction of the heating circuit medium, each have a connection interface 5.1, 5.2, 11.1, 11.2 for the partial coupling and decoupling of the two partial heating circuits 1.1, 1.2 upstream and downstream of the heat consumer 5, 11, it finally advantageously results that, in addition to the valve device 2 and the buffer storage tank 8, both the overall heating circuit pump 10 and the partial heating circuit pump 4 can be arranged at a central location in a building. List of reference symbols

[0026] 1 Total heating circuit 1.0.1 Flow branch 1.0.2 Return branch 1.1 Partial heating circuit 1.1.1 Supply 1.2 Partial heating circuit 2 Valve device 2.1 First connection 2.2 2.3 Second connection Third connection 3 Pipe branch First pipe connection 3.1 3.2 Second pipe connection 3.3 Third pipe connection 4 Partial heating circuit pump 5 Heat consumer 5.1 5.2 Connection interface Connection interface 6.1 First branch 6.2 Second branch 7 Bypass 8 Buffer tank 9 Heat exchanger 10 Total heating circuit pump 10 Partial heating circuit pump 11 Heat consumer 11.1 Connection interface 11.2 Connection interface

Claims

1. A heating system comprising an overall heating circuit (1) guiding a heating circuit medium and a first and a second sub-heating circuit (1.1, 1.2) connected in each case to the overall heating circuit (1) and also guiding the heating circuit medium, wherein a valve device (2) is provided for defining a heating circuit medium volumetric flow through the sub-heating circuits (1.1, 1.2), wherein the valve device (2) has a first connection (2.1) connected to the second sub-heating circuit (1.2), a second connection (2.2) and a third connection (2.3) connected to the overall heating circuit (1), wherein the second connection (2.2) is configured to be connected to a feed (1.1.1) for the first sub-heating circuit (1.1), wherein a heat consumer (11) is arranged on the first sub-heating circuit (1.1), wherein a sub-heating circuit pump (4) and a heat consumer (5) are arranged on the second sub-heating circuit (1.2), and a bypass (7) is provided, characterised in that a buffer store (8) is provided on the second sub-heating circuit (1.2) for increasing the volume of the bypass (7) and thus for improving the controllability of the second sub-heating circuit (1.2).

2. The heating system according to claim 1, wherein the overall heating circuit (1) has a flow line (1.0.1) and a return line (1.0.2), characterised in that the valve device (2) is arranged on the flow line (1.0.1) of the overall heating circuit (1).

3. The heating system according to claim 1 or 2, wherein the overall heating circuit (1) has a flow line (1.0.1) and a return line (1.0.2), characterised in that a line branching (3) with three line connections is provided on the return line (1.0.2) of the overall heating circuit (1), wherein the first line connection (3.1) is configured to be hydraulically connected to the first sub-heating circuit (1.1), the second line connection (3.2) to the second sub-heating circuit (1.2) and the third line connection (3.3) to the return line (1.0.2) of the overall heating circuit (1).

4. The heating system according to one of claims 1 to 3, characterised in that on the second sub-heating circuit (1.2), when viewed in the direction of flow of the heating circuit medium, on the one hand, a first branching (6.1) is provided upstream of the sub-heating circuit pump (4) and upstream of the heat consumer (5) and, on the other hand, a second branching (6.2) is provided downstream of the sub-heating circuit pump (4) and downstream of the heat consumer (5).

5. The heating system as claimed in claim 4, characterised in that the two branchings (6.1, 6.2) are configured to be hydraulically connected together via the bypass (7).

6. The heating system as claimed in claim 5, characterised in that the bypass (7) is configured to be provided with the buffer store (8) which is hydraulically connected, on the one hand, to the first branching (6.1) and, on the other hand, to the second branching (6.2).

7. A method for operating a heating system, in which a heating circuit medium is guided in an overall heating circuit (1), in which the heating circuit medium is guided in a first and a second sub-heating circuit (1.1, 1.2) connected to the overall heating circuit (1), in which a heating circuit medium volumetric flow through the sub-heating circuits (1.1, 1.2) is defined by a valve device (2), in which the heating circuit medium volumetric flow is fed via a first connection (2.1) of the valve device (2) to the second sub-heating circuit (1.2) and / or is guided via a second connection (2.2) of the valve device (2) and in which the heating circuit medium volumetric flow is fed to the valve device (2) via a connection (2.3) which is connected to the overall heating circuit (1), wherein the heating circuit medium volumetric flow, if required, is fed to the first sub-heating circuit (1.1) via the second connection (2.2) of the valve device (2), wherein the heating circuit medium volumetric flow, if required, is delivered via a bypass (7) provided on the second sub-heating circuit (1.2), characterised in that the heating circuit medium volumetric flow, if required, is guided on the bypass (7) through a buffer store (8) for increasing the volume of the bypass (7) and thus for improving the controllability of the second sub-heating circuit (1.2).

8. The method according to claim 7, characterised in that a usable temperature at a heat consumer (5) of the second sub-heating circuit (1.2) is regulated via a rotational speed of a sub-heating circuit pump (4) of the second sub-heating circuit (1.2).

9. The method according to claim 7 or 8, characterised in that a proportion of the heating circuit medium volumetric flow guided through the buffer store (8) is regulated by means of the valve device (2) and by means of a rotational speed of a sub-heating circuit pump (4) of the second sub-heating circuit (1.2).

10. The method according to one of claims 7 to 9, characterised in that the heating circuit medium, if required, is selectively guided by the valve device (2) entirely via the first sub-heating circuit (1.1) or entirely via the second sub-heating circuit (1.2).

11. The method according to one of claims 7 to 9, characterised in that a distribution of the heating circuit medium, which flows in via the connection (2.3), to the connections (2.1, 2.2) is set by the valve device (2).

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