EP3339750A1 - Fluid supply and circulation system - Google Patents

Abstract

The present invention relates to a fluid supply and circulation system (1) with a storage unit (20) for storing and / or conditioning a fluid having an adjustable property, with at least one supply line (32) to at least one withdrawal point (70) and at least one Circulation line (62), with a circulation pump (64) for the circulation of the fluid, wherein the at least one supply line (32) and the at least one circulation line (62) are fluid-conductively connected. Furthermore, a circulation regulator (40) can be arranged in the system (1), which comprises a feed region (47) and a circulation region (48), which can be connected to one another in a fluid-conducting manner by means of an overflow valve (42).

Description

Technical field of the invention

The present invention relates to a fluid supply and circulation system, in particular for a hot water supply.

State of the art

Fluid supply and circulation systems are known in process engineering and in particular in building technology. Thus, hot water supplies, for example in buildings, generally include a central hot water supply or a central water heating device, here called storage unit for short, and from this, at least one supply line leads to at least one hot water tapping point. One of the challenges is that hot water with a desired setpoint temperature and in sufficient quantity at the extraction point is available as quickly as possible in all operating states. The time between the beginning of the removal of hot water and the actual provision of water with target temperature at the sampling point can be several seconds, so that a user often runs out of insufficiently heated water unused, which is thus wasted. One of the reasons is that in a more or less long supply line standing hot water cools quickly, so that initially only cooled water is available at the reference point.

In addition, arise at colder temperatures due to Legionella hygienic problems that can be sufficiently suppressed only at temperatures from about 55 ° C.

A further development is integrated circulation systems, which are set up to provide hot water at a sampling point permanently. Known Warmwasserversorgungs- and circulation systems provide a circulation line, by means of which from the Near the reference point from the supply line warm water is led back to a hot water storage unit or water treatment plant. In the simplest case, such a system provides that always a - albeit small - amount of hot water circulating through the existing piping system. As a result, the hot water remains largely at a constant, relatively high temperature level.

The return to a storage unit, formed as a layer memory, then creates problems when the circulating water has a different temperature than the layer in which it is introduced into the stratified storage. In the stratified storage creates an unwanted turbulence, which leads to a reduction in temperature. To compensate for the temperature reduction heat energy must be supplied.

Basically, a decrease in temperature in the system, especially in drinking water systems, proves to be problematic from a hygienic point of view, since there is a risk that there is an increased Legionellenbildung and the lowered temperature, the thermal barrier can no longer prevent propagation in the system.

In order to reduce the heat losses occurring during a circulation mode, the circulation line may also be in thermal contact with the hot water supply line for at least a part of its length. In particular, it is known that the circulation line is arranged within the supply line or vice versa up to a connection region of the removal point, for example in the form of a tube-in-tube arrangement. In general, a line system with an at least partially extending in the volume of the supply line circulation line is very expensive and requires special constructions for connection elements. The installation and installation costs and the material requirements are considerable. It is considered to be particularly disadvantageous that, in the case of a combined supply and circulation line, the available flow cross-section for the hot water requested at the removal point is markedly reduced. In particular, the so-called pipe-in-pipe systems provide hot water at the extraction point not available in a sufficiently large amount, so that the lines must be sized accordingly larger.

Hot water supply and circulation systems are known from the prior art, in which the circulation line is connected in the vicinity of the removal point to the supply line, wherein the circulation line and supply line are at least partially formed as coaxial lines. Depending on the operating mode of the hot water supply is intended to reverse the flow direction of the circulating water in the circulation line. When dispensing water at the point of withdrawal, i. during a supply mode, hot water flows in parallel via the supply line and the circulation line to the sampling point and can be used for supply. During a circulation mode, the hot water passing from the supply line to the circulation line flows in the opposite direction of flow, i. the hot water circulates in the circulation pipe via the storage unit. For this purpose, a circulation pump may be arranged in the system. Other such systems include a check valve in the circulation line, which opens due to a pressure drop in the system in the supply mode, so that it comes to the parallel flow in the supply and circulation line.

The known systems are not equally suitable for the two modes of operation, i. for the hot water supply and the circulation, so that there is still a need for an optimization in terms of energy and material costs, especially with regard to the costs.

Summary of the invention

The object of the present invention is therefore to provide a fluid supply and circulation system which is improved with regard to energy and material expenditure, which is easy and quick to install and can be easily retrofitted, in particular, for an existing system. Furthermore, such a system without electrical or electronic control effort, mechanically be switched between a supply mode and a circulation mode.

A further object of the present invention is seen in the fact that, in a fluid supply and circulation system according to the invention, fluid of a certain desired property and in sufficient quantity is always available at at least one withdrawal point. Furthermore, it should be ensured with the inventive fluid supply and circulation system that a plurality of consumers a fluid of a desired property is provided, the energy consumption is as low as possible.

These objects are achieved according to the invention in particular by the features of patent claim 1. Advantageous embodiments of the invention are disclosed in the subclaims.

The present invention is based on a fluid supply and circulation system, comprising at least one supply to at least one withdrawal point, also referred to as reference point, a storage unit in which a fluid is stored and / or prepared, so that the fluid has an adjustable property and a Circulation system in which the fluid can be guided in a continuous circulation between the storage unit and the withdrawal point.

In this case, the circulating system comprised comprises a circulation line, a circulation pump for forced circulation of the fluid, possibly a treatment device for setting a specific fluid property, for example a heat pump and an introduction point into the storage unit, possibly equipped with a check valve.

Such a system changes mechanically when in fluid supply at the at least one sampling point in a supply mode and in the closed sampling point in a circulation mode. The system is designed so that the fluid always has the same properties in the system and in particular at the reference points.

The circulation line is connected directly to a withdrawal point to the supply, so that virtually all the hot water circulates and in particular, no cold water column is established in the supply line. The circulation line extends at least partially adjacent to the feed line.

Depending on the field of application of the system according to the invention, it is a liquid or gaseous fluid, for example water. The fluid has at least one adjustable property, for example a physical, chemical, biological and / or thermal property, in particular it is water with a desired temperature. The storage unit may be formed as a layer memory or as a treatment device, wherein means are included, by means of which the desired property of the fluid is adjusted. The storage unit may be e.g. to act a hot water treatment plant. For example, the extraction points may be a faucet.

A system according to the invention can also be used in the field of process engineering, for example in order to convert an unstable mixture by circulation, carried out at time intervals, into a homogeneous mixture. In general, the system can be used for fluids if a temporary stabilization of the fluid system by circulation and treatment can be restored.

The inventive fluid supply and circulation system comprises a storage unit for storing and / or conditioning a fluid having an adjustable property, with at least one supply line to at least one withdrawal point and at least one circulation line, with a circulation pump for circulation of the fluid, wherein the at least one supply line and the at least one circulation line are fluid-conductively connected to one another.

The fluid supply and circulation system according to the invention can be connected to a circulation regulator, comprising a supply region and a circulation region, which can be connected to one another in a fluid-conducting manner by means of an overflow valve.

The at least one circulation line is fluid-conductively connected to the at least one supply line in the region of the at least one removal point. This prevents that circulating in a stub to the sampling point fluid volume does not circulate.

If the system is in the circulation mode, the overflow valve is closed. All fluid in the system circulates.

The circulation controller, a central functional unit, can be arranged in the system and can be connected to a suction side of the circulation pump such that it is not flowed through in the supply mode. Accordingly, no flow resistance is generated, which would otherwise have to be counteracted with a larger pumping capacity. In the circulation mode, the fluid is guided along a circuit, being guided via the circulation line connected to the supply line, via the circulation controller to the suction side of the circulation pump, and further into the storage unit.

Switching between supply mode and circulation mode is mechanical. With the sampling point open in supply mode and the pressure differential between the prevailing system pressure and the atmospheric pressure, a pressure drop is created in the system. The overflow valve opens when the system pressure drops by a certain value in at least one opened removal point, the overflow valve being adjustable in terms of the value. At the overflow valve is adjustable at which pressure drop opens the spill valve.

In the supply mode of the system, the spill valve is open. That is to say when fluid is dispensed at at least one removal point and opened overflow valve, fluid flows via the at least one supply line and at least partially via the at least one circulation line to the at least one opened removal point, wherein the flow direction is at least partially opposite in the circulation line to that in the circulation mode. Thus, in the circulation controller, the fluid flows in parallel from at least part of the at least one circulation line from the circulation area and in the at least one supply line to the at least one opened removal point, wherein the flow direction in the circulation line is opposite to that in the circulation mode. Accordingly, the volume of the line cross sections, ie of the supply and circulation line, for the delivery of the fluid having a desired property is available at the removal point.

The flow direction in the circulation line is dependent on the prevailing operating mode, or is determined by the position of the overflow valve.

In one embodiment of the fluid supply and circulation system, one or more ring lines are connected to the circulation regulator, to each of which a plurality of withdrawal points are connected in series, wherein the supply line and the circulation line are at least partially formed as a loop.

However, it can also be provided that the at least one supply line to at least one removal point and the at least one circulation line are at least partially formed adjacent to each other. In a preferred embodiment, the supply and circulation lines are designed in the form of a two-chamber line, which is preferably flexible. For example, an internal partition in the conduit divides it into a supply chamber and a circulation chamber. Here, the supply chamber forms a portion of the supply line and the circulation chamber forms a portion of the circulation line. Preferably, the partition is drawn into a flexible conduit having a circular cross-sectional area, which subdivides these into two semicircular, substantially equal cross-sectional areas, wherein the wall thickness of the partition is in the range between 0.5 mm to 2.5 mm.

The two-chamber line can be dimensioned such that it can be connected to other elements of the system, for example a faucet, which are commercially available, standardized elements. An outer diameter of the two-chamber line is preferably in a range of 12 mm to 32 mm with a wall thickness between 1.7 mm to 3 mm.

Such a two-chamber line significantly reduces the installation and insulation costs. The energy loss is reduced, since instead of two separate lines now only a two-chamber line is provided, whereby the space requirement of the wiring is less. Furthermore, an assembly of a two-chamber line is more flexible, since the assignment of the chambers is freely selectable and therefore slightly adaptable to the situation, as will be explained below.

In order to provide the fluid-conducting connection of the supply line to the circulation line in the vicinity of the removal point, an opening, e.g. a through hole, be formed. In a preferred embodiment it is provided that the two-chamber line is connected by means of a connecting piece with the at least one removal point, wherein a suitable connection of a flexible two-chamber line is formed at the removal point. The connecting piece is designed, for example, such that the two chambers of the two-chamber line open into a common space which forms a fluid-conducting connection between the feed chamber or feed line and the circulation chamber or circulation line of the two-chamber line.

In one embodiment, at least one two-chamber line is connected to the circulation controller, for example, this is screwed or compressed in a connection area with the circulation controller. Advantageously, such a connection also compensates for differences in the dimension of the two-chamber line. Furthermore, the supply chamber of the two-chamber line is fluid-conductively connected to the supply area of the circulation regulator and, accordingly, the circulation chamber is connected to the circulation area. Advantageously, the two-chamber line can be connected in any position to the circulation controller. To produce the fluid-conducting connection of the feed chamber of the at least one two-chamber line to the feed region, formed in the circulation regulator, a connecting piece is provided. This connector is at a first end largely sealingly connected to the supply chamber of the two-chamber line and at a second end largely sealingly connected to the supply of the circulation regulator, wherein the second end of the connector in alignment with the connection area for the Two-chamber line is formed. The connector is formed to have a semi-circular cross-section at the first end while the second end has a circular cross-section. Further, the portion between the first and second ends is arcuate, so that by rotation of the connector regardless of the orientation of the two-chamber line, the supply chamber can be connected to the supply of the circulation controller.

With the fluid supply and circulation system according to the invention, a regulation of the system functions is achieved in a simple manner, wherein no special connection elements, complex installations and only a small material requirement are necessary. Furthermore, the flow in the direction of the extraction point is not impeded by elements, in particular the circulation pump does not flow through in a supply mode. Only in the supply mode, the resistance of the overflow valve must be considered, so that the pressure loss is minimal. The energy consumption is therefore very low and there are no pressure fluctuations at the or the sampling points.

In particular, the circulation regulator may be formed as a modular unit so that it can be integrated into an existing fluid supply and circulation system.

If the system according to the invention is associated with a storage unit whose thermal stratification is not to be impaired or if a constant of the temperature prevailing in the storage unit is a decisive criterion, it is provided that before the fluid is returned to the storage unit or the treatment plant, possible losses of the fluid, For example, thermal losses are covered by a separate treatment device. For example, the circulating fluid can be heated by means of a heat pump, which receives the necessary energy from a cold water treatment. Furthermore, the cold water continues to cool, which is advantageous in terms of hygiene.

Brief description of the drawings

• Fig. 1 eine schematische Darstellung einer Ausführungsform eines erfindungsgemässen Fluidversorgungs- und Zirkulationssystems mit einem Zirkulationsregler und einer Zweikammerleitung;
• Fig. 2 eine schematische Darstellung einer weiteren Ausführungsform eines erfindungsgemässen Fluidversorgungs- und Zirkulationssystems mit einem Zirkulationsregler und einer Ringleitung;
• Fig. 3a einen Querschnitt durch die Ausführungsform eines Zirkulationsreglers für eine Zweikammerleitung; und
• Fig. 3b einen Längsschnitt durch die Ausführungsform eines Zirkulationsreglers für eine Zweikammerleitung;
• Fig. 4 einen Querschnitt durch die zweite Ausführungsform eines Zirkulationsreglers für eine Ringleitung;
• Fig. 5 eine schematische Darstellung eines erfindungsgemässen Fluidversorgungs- und Zirkulationssystems mit einem Zirkulationsregler und einer Zweikammerleitung, sowie einer Zirkulationserwärmung mit Wärmepumpe.

In the following, the invention will be explained in more detail with reference to the embodiments illustrated in the figures. Show it:

• Fig. 1 a schematic representation of an embodiment of a fluid supply and circulation system according to the invention with a circulation controller and a two-chamber line;
• Fig. 2 a schematic representation of another embodiment of an inventive fluid supply and circulation system with a circulation controller and a loop line;
• Fig. 3a a cross-section through the embodiment of a circulation controller for a two-chamber line; and
• Fig. 3b a longitudinal section through the embodiment of a circulation controller for a two-chamber line;
• Fig. 4 a cross section through the second embodiment of a circulation controller for a loop;
• Fig. 5 a schematic representation of an inventive Fluidversorgungs- and circulation system with a circulation controller and a two-chamber line, and a circulation heating with heat pump.

Detailed description of the embodiments of the invention

In Fig. 1 is purely schematically illustrated a fluid supply and circulation system according to the invention, briefly referred to as a system and identified by reference numeral 1. The system 1 in the illustrated embodiment is a hot water supply and circulation system operating in a supply mode and in a circulation mode. In Fig. 1 and in the following figures unspecified arrows are shown, which indicate a flow direction of a fluid.

The system 1 comprises a storage unit 20 into which fluid can be supplied via a device 10, not shown, for example, to compensate for a withdrawal of water by a consumer. In the storage unit 20, the fluid stored therein is conditioned so as to be available for removal with an adjustable property, e.g. heated to a target temperature in the case of hot water. The memory unit 20 is adjoined by a supply, denoted by 30, comprising at least one supply line 32 to a circulation controller 40. However, the supply 30 can also be designed as a main distribution line with lines connected thereto. From the circulation regulator 40, a connection 50 leads to at least one removal point 70, wherein in the illustrated embodiment the connection 50 is designed as a two-chamber line 51, comprising a section of the supply line 32 and a section of a circulation line 62. The removal point 70 can be a faucet, where a user can get tempered water. Further, the circulation controller 40 is connected to a circulation system 60 comprising the circulation line 62 to circulate hot water in the system 1 by means of a circulation pump 64 arranged in the circulation line 62. The water delivered in the circulation system 60 is returned to the storage unit 20.

The circulation regulator 40 arranged in the system 1 comprises an overflow valve 42, which produces an indirect fluid-conducting connection between the supply line 32 and the circulation line 62 as a function of the operating mode. Due to a pressure gradient occurring in the supply mode in the system 1, the overflow valve 42 opens. In the supply mode, the overflow valve 42 is open; in the circulation mode, the overflow valve 42 is closed.

According to the invention, the circulation regulator 40 comprises a chamber-like region 46 divided by a subdivision 58 into a feed region 47 and a circulation region 48. The feed region 47 is in fluid communication with the feed line 32 and the circulation region 48 with the circulation line 62. In the illustrated embodiment the connection 50 to the at least one removal point 70 is formed as a two-chamber line 51, in which a supply chamber 52 and a circulation chamber 53 are formed in close contact with each other. For example, the two-chamber line 51 is formed as a flexible tube. In the two-chamber conduit 51, a partition wall 54 disposed therein may divide it into the supply chamber 52 and the circulation chamber 53, which have approximately a semicircular cross-sectional area of the same size. In the region of the removal point 70, the partition wall 54 is provided with an opening through which in the circulation mode fluid can flow from the supply chamber 52 into the circulation chamber 53.

The feed region 47 and the circulation region 48 of the circulation regulator 40 can be connected to one another via the overflow valve 42, with a fluid-conducting connection between the feed region 47 and the circulation region 48 when the overflow valve 42 is open. This state corresponds to that during a supply mode, so that the connected to the two-chamber line 51 at least one sampling point 70 is supplied in parallel via feed chamber 52 with hot water and circulation chamber 53 also with hot water in a comparable amount, thus, the entire cross section of the two-chamber line 51 for the hot water flow can be used. However, in the supply mode, a certain amount of hot water also flows in the circulation system 60, which corresponds to that circulating in the circulation mode therein. In circulation mode, i. when the overflow valve 42 is closed, warm water flows via the supply line 32, the feed region 47 of the circulation regulator 40, the feed chamber 52 of the two-chamber line 51 and near the removal point 70 into the circulation chamber 53 of the two-chamber line 51 connected thereto, into the circulation area 48 of the circulation regulator 40 and into the circulation area Circulation system 60.

Depending on the operating mode, the flow direction of the fluid is reversible at least in a part of the circulation line 62 assigned to the circulation regulator 40, ie in particular in the circulation line 53 of the two-chamber line 51. The fluid can flow in opposite directions in sections of the circulation line 62, as indicated by arrow 44 is indicated.

FIG. 2 shows a second embodiment of the inventive system 1. The system 1 comprises as in Fig. 1 illustrated system 1 elements, which are identified by the same reference numerals. The included circulation controller 40 is alternatively designed. At the circulation controller 40, the connection 50 is connected to supply a plurality of extraction points 70. The connection 50 is formed in the illustrated embodiment as a loop 55. The ring line 55 is connected to the feed region 47 of the circulation regulator 40 and extends to the collection points 70 arranged in series and further into the circulation area 48 of the circulation regulator 40. The supply area 47 can be fluid-conductively connected to the circulation area 48 via the overflow valve 42. The circulation area 48 of the circulation regulator 40 is therefore likewise connected in a fluid-conducting manner to the ring line 55. The portion of the ring line 55 which is fluid-conductively connected to the circulation area 48 is referred to as ring circulation line 56. In the supply mode, ie, when hot water is drawn at one of the plurality of extraction points 70, the water tempered accordingly in the storage unit 20 flows via the supply line 32, the feed region 47, a part of the ring line 55 and simultaneously - with the overflow valve 42 open - via the circulation region 48 and the ring circulation line 56 to the removal points or 70, so that hot water is available in large quantities.

In Fig. 3a is a detail of the embodiment according to Fig. 1 of the circulation controller 40. In the illustrated embodiment, corresponding Fig. 1 , the two-chamber line 51 is connected to the circulation controller 40, comprising the supply chamber 52 and the circulation chamber 53 in close contact with each other. For example, the two-chamber pipe 51 is formed as a flexible pipe divided by the partition wall 54. The circulation controller 40 includes the chamber-like region 46 divided into the feed region 47 and the circulation region 48. The two-chamber pipe 51 is largely formed on the chamber-like region 46 by means of a port 49 sealingly connected. The circulation chamber 53 of the two-chamber line 51 is in fluid communication with the circulation area 48. The supply chamber 52 is connected to the supply area 47 of the circulation regulator 40 via a connecting piece 90. The connecting piece 90 is in one corresponding opening 59 in the partition 58 of the circulation controller 40 rotatably received. The connecting piece 90 has a first end 92, formed with a semicircular cross section and a second end 94, formed with a circular cross section, wherein both ends 92, 94 arcuately merge into each other. Preferably, the connecting piece 90 is a rigid element which is sealingly connected at the first and second ends 92, 94 to the feed chamber 52 and to the opening 59 in the partition 58, respectively. By rotating the connecting piece 90 in the opening 59 of the partition 58 about a central axis 100, a connection between the feed chamber 52 and the feed region 47 can be established independently of the orientation of the two-chamber line 51.

The feed region 47 and the circulation region 48 can be connected to one another via the overflow valve 42, with a fluid-conducting connection between the feed region 47 and the circulation region 48 when the overflow valve 42 is open. The open state exists during the supply mode, so that connected to the two-chamber line 51 at least one withdrawal point 70 is supplied in parallel via feed chamber 52 and the circulation chamber 53 with hot water in large quantities, since the entire cross section of the two-chamber line 51 can be used for the hot water flow.

In Fig. 3b a longitudinal section through an embodiment of a circulation regulator 40 is shown. At the circulation controller 40 a plurality of two-chamber lines 51a, 51b, 51c for supplying a plurality of withdrawal points 70 (not shown) is connected. Here, the chamber-like portion 46 of the circulation controller 40 is provided with the respective ports 49a, 49b, 49c for the two-chamber lines 51a, 51b, 51c and connected to the supply line 32 and the circulation passage 62. Between the supply portion 47 and circulation portion 48, the spill valve 42 is disposed. From the Fig. 3b It can be seen that the connecting pieces 90a, 90b, 90c are accommodated between a respective feed chamber 52 of the two-chamber lines 51a, 51b, 51c and the feed region 47 in different orientations in the respective openings 59 in the partition 58 to form a fluid-conducting connection between feed chamber 52 of the respective two-chamber lines 51a, 51b, 51c and the feed region 47.

Further, denoted by 110 is a flow member disposed in the supply portion 47 for directing the flow path of the fluid flowing into the chamber-like portion 46 of the circulation controller 40 through the supply pipe 32 so as to favorably influence the flow pressure loss.

Fig. 4 FIG. 3 illustrates a schematic cross-section through the embodiment of a circulation regulator 40 to which a loop 55 is connected. The circulation regulator 40 is subdivided by the subdivision 58 into the feed region 47 and the circulation region 48, the overflow valve 42 likewise being arranged on the subdivision 58 in order to establish a fluid-conducting connection between the regions 47, 48 in the case of the supply mode. At the feed area 47, the ring line 55 is connected in addition to the supply line 32, not shown, which serves to supply a plurality of (not shown) removal points 70. Connected to the circulation area 48 is the circulation line 62 (not shown) and that portion of the ring line 55 which is referred to as ring circulation line 56.

Fig. 5 provides next to the inventive fluid supply and circulation system 1 according to the embodiment according to Fig. 1 With the circulation controller 40 and the two-chamber line 51, a treatment system 120 for conditioning the circulating in the circulation system 60 fluid. The treatment system 120 includes a cold water treatment 122, which is in heat exchange with the circulating fluid 60 in the circulation system. Fluid, in particular cold water, which is supplied via the supply 10 in the storage unit 20 can be supplied via a cold water line 124 of the cold water treatment 122 and from there to a discharge point 70. The circulation system 60 and the cold water treatment 122 are connected via a heat pump 126 in thermal contact, so that the cold water heat is removed, which is used to heat the circulating fluid in the circulation system 60 before it is returned to the storage unit 20.

Claims (15)

Fluid supply and circulation system (1) with a storage unit (20) for storing and / or conditioning a fluid with an adjustable property, with at least one supply line (32) to at least one withdrawal point (70) and at least one circulation line (62), with a Circulation pump (64) for the circulation of the fluid, wherein the at least one supply line (32) and the at least one circulation line (62) are fluid-conductively connected, characterized in that in the system (1) a circulation regulator (40) can be arranged, which is a supply area (47) and a circulation area (48) which can be connected to one another in a fluid-conducting manner by means of an overflow valve (42). System (1) according to claim 1, characterized in that the at least one circulation line (62) in the region of the at least one removal point (70) is fluid-conductively connected to the at least one supply line (32). System (1) according to one of claims 1 or 2, characterized in that in a circulation mode, the overflow valve (42) is closed. System (1) according to one of claims 1 to 3, characterized in that in a supply mode, the overflow valve (42) is opened. System (1) according to one of claims 1 to 4, characterized in that the overflow valve (42) opens when at least one opened sampling point (70), the system pressure drops by a certain value, wherein the spill valve (42) in terms of value is adjustable. System (1) according to claim 4 or 5, characterized in that the circulation controller (40) in such a way with a suction side of the circulation pump (64) is connectable, that it is not flowed through in the supply mode. System (1) according to one of claims 1 to 6, characterized in that when the overflow valve (42) fluid via the at least one supply line (32) and at least a part of the at least one circulation line (62) of the at least one removal point (70). flows in. System (1) according to one of claims 1 to 7, characterized in that the supply line (32) and the circulation line (62) are at least partially formed as a ring line (55). System (1) according to one of claims 1 to 7, characterized in that at least in sections, the at least one supply line (32) as a feed chamber (52) and the at least one circulation line (62) are designed as a circulation chamber (53) formed in one of a partition (54) divided two-chamber line (51) and each having a semicircular cross-section. System (1) according to claim 9, characterized in that the two-chamber duct (51) by means of a connecting piece with the at least one extraction point (70) is connected, wherein the in the two-chamber conduit (51) included feeding chamber (52) and circulation chamber (53) in open a common space in the connector. System (1) according to claim 9 or 10, characterized in that the two-chamber line (51) is designed as a flexible conduit. System (1) according to one of claims 9 to 11, characterized in that the two-chamber line (51) has an outer diameter in the range of 12 mm to 32 mm and a corresponding wall thickness in the range of 1.7 mm to 3 mm. System (1) according to one of claims 9 to 11, characterized in that the two-chamber line (51) is connected to the circulation regulator (40), wherein the feed chamber (52) by means of a connecting piece (90) with the feed region (47) and the Circulation chamber (53) with the circulation area (48) is fluid-conductively connected. A system (1) according to claim 13, characterized in that the connecting piece (90) has a first end (92) with a semicircular cross section and a second end (94) with a circular cross section, wherein the first end (92) and second end (94 ) merge into each other in an arc. The system (1) according to claim 14, characterized in that the connector (90) is rotatably received with the second end (94) about an axis (100) in an opening (59) of a partition (58) of the circulation regulator (40).

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