EP3670765A1 - Water heater feed - Google Patents

Abstract

Water pipe system (1) for a building with at least one hot and one cold water pipe (2, 3) for supplying consumers (6) arranged thereon, the cold water pipe (3) being connected on the inlet side to a supply network (5) containing a water heater ( 4), the hot water line (2) being connected to the water heater (4) and preferably being designed as a ring line, the cold water line (3) being connected to the water heater (4) downstream of the consumers (6) arranged thereon and the Water heater (4) supplied with drinking water.

Description

The invention relates to a water pipe system and a method for a building with at least one hot and one cold water pipe for supplying consumers arranged thereon, the cold water pipe being connected on the inlet side to a supply network comprising a water heater, the hot water pipe being connected to the water heater and a Corresponding method in which a regular flushing is carried out to avoid contamination of the hot and / or cold water pipe of the water pipe system.

A common type of installation of water pipe systems in buildings, which are flushed from time to time to avoid contamination so that the water does not stagnate for too long, is that the hot and / or cold water is flushed out of the water pipes during flushing. With this type of installation, drinking water is flushed into the drain, which is to be avoided from an ecological and economic point of view.

The EP 1 845 207 B1 discloses such a flush, wherein the drinking or process water is flushed into the drain.

The EP 3 321 594 A1 discloses a water system with a flow heater and a flushing station in which the standing water is flushed out through a sewage connection until the desired temperature is reached.

It is an object of the invention to propose a device and a method associated therewith which reduce the consumption of drinking water while nevertheless flushing the water pipes regularly to avoid their contamination.

According to the invention, this object is achieved in that the cold water line is connected to the water heater downstream of the consumers arranged thereon and supplies the water heater with drinking water and the water heater in this way with the cold water line is connected that when hot water is drawn from at least one consumer, the cold water pipe is flushed.

A water heater is to be understood as a boiler, a hot water tank, a fresh water station as well as a continuous-flow heater, whereby a fresh water station means heat exchangers of any type.

The present invention relates to a water pipe system for buildings with at least one hot and one cold water pipe for supplying consumers arranged thereon. The cold water pipe is connected to a supply network on the inlet side. The water pipe system contains a water heater. The hot water line is connected to the water heater and is preferably designed as a ring line which leads back to the water heater. The cold water pipe, which is connected on the inlet side to a supply network, is connected to the water heater downstream of the consumers arranged thereon and supplies the water heater with drinking water.
This type of piping prevents drinking water or fresh water from being flushed into the drain. Instead of the water pipe being connected at the end to the drain, as is known from the prior art, in the present invention the water pipe is connected at the end to the water heater. To avoid germs that can occur when the water is idle for a longer period of time, water pipes are regularly flushed out in water pipe systems, usually in public buildings such as hospitals or hotels, as well as in residential complexes with several apartments, but also in single-family houses. By regularly flushing the hot water pipe, the hot water is regularly raised to a temperature at which the bacteria no longer multiply, the temperature preferably being above 52 ° C. as a rule. Bacteria cannot multiply in the cold water line if the temperature drops below approx. 15 ° C, which in turn is achieved by regularly flushing the cold water line, since the incoming fresh water has a lower temperature than the standing drinking water in the cold water line via the network connection .

The method according to the invention for operating a water pipe system in a building, with at least one hot and one cold water pipe for supplying consumers arranged thereon, the cold water pipe being connected on the inlet side to a supply network, contains a water heater. The hot water line is connected to the water heater and is preferably designed as a ring line which leads back into the water heater. In the method according to the invention, the warm and / or cold water pipe is flushed regularly. The water heater is connected to the cold water pipe in such a way that the cold water pipe is flushed through when at least one consumer draws hot water. This means that each time hot water is drawn off, the entire water supply system is flushed out and the drinking water or fresh water that is in the cold water line is not flushed into the drain but is directed into the water heater.

A preferred embodiment consists in the water pipe system having at least one circulation pump, the circulation pump serving to move the water in the pipes. It is advantageous if the circulation pump is arranged in the hot water circuit or in the ring line of the hot water circuit. This enables water to move in the hot water pipe without any hot water being withdrawn from a consumer. The circulation pump is preferably arranged in the hot water circuit, since there a contamination can occur due to the temperatures faster than in the cold water circuit, but an arrangement of a circulation pump in the cold water circuit is also conceivable.

It is advantageous if the cold water line is connected to the water heater in the flow direction after all consumers arranged on the cold water line. This has the advantage that all consumers connected to the cold water pipe are flushed out. Here, the cold water pipe is connected in the flow direction at the end or outlet side, that is to say at the end of the cold water pipe, to the water heater and the fresh water flows exclusively into the water heater via the cold water pipe. A further embodiment of the invention is that a bypass valve is arranged on the cold water line, preferably in front of the consumers, the bypass valve allowing the water heater to be supplied with cold water directly, but the cold water line is flushed with the consumers arranged thereon. This configuration of the invention can prevent the flow pressure in the hot or cold water line from falling or at the consumers. Since the hot water must first flow through the entire cold water pipe, it is possible that a lower flow pressure will prevail in the hot water pipe if consumption is high. To avoid this, a bypass valve can be provided in the cold water line, which provides a more direct route to the outlet side or end side of the cold water line, which is connected to the water heater. This means that the cold water can also be fed directly into the water heater, although there is still a flow through the cold water pipe. Alternatively, there is also the possibility of avoiding a lower flow pressure in the hot water pipe by making the cold water pipe or the diameter larger.

A pressure reducing valve is preferably provided as a bypass valve on the cold water line. As mentioned before, this prevents the flow pressure in the hot water pipe from reducing when there is a high consumption on the consumers. The pressure reducing valve can be adjusted accordingly and opens when the pressure drop is too great and allows the water to flow directly into the cold water pipe just before the water heater.

As a further configuration option, a flushing valve is arranged on the cold water line and / or on the hot water line. This means that fresh water or drinking water can still be rinsed out if necessary for hygienic reasons.

When using hot water, whether by operating the flush valve or by operating a consumer, the advantage is that the entire water supply system is flushed. This means that both hot and cold water pipes are flushed because hot water flows from the water heater into the hot water pipe and again the Water heater is fed with cold water from the cold water pipe. This in turn has the effect that cooler fresh water flows into the cold water pipe and no bacteria can form due to the low temperature.

The flushing valve is preferably arranged after the consumers and before the water heater in order to enable the aforementioned flushing out into a drain if necessary.

When flushing the cold water line, which is connected to the water heater, the water heater is preferably supplied with fresh water or drinking water and the flushing of the fresh water or drinking water into the drain is avoided or reduced. The rinsing of the hot and cold water pipes is already stimulated by the removal of hot water from a consumer, whereby the fresh water or drinking water flows from the cold water pipe into the water heater. In addition to the advantage that the fresh water flowing into the cold water pipe from the supply network is at a lower temperature than the drinking water already in the cold water pipe, which prevents the accumulation of bacteria, and the temperature of the standing drinking water may have warmed up to room temperature , it also brings with it the advantage in terms of energy that the slightly warmed drinking water is fed into the water heater without having to bring in additional energy.

It is advantageous if, in the case of a high flow pressure drop in the hot and / or cold water line, the water heater is fed directly via a bypass valve. This prevents a high drop in the flow pressure in the pipes because if there is a high demand for water, the fresh water can be fed directly into the water heater and the cold water pipe does not have to be flowed through first.

A preferred embodiment of the method according to the invention consists in that a movement of the drinking water is generated in the complete water supply system by means of a circulation pump, preferably in the hot water line, which is preferably designed as a ring line. Stagnant water that is too long can thus be avoided even if no withdrawal to consumers. For example, the hot water circuit can be driven at regular intervals in order to avoid excessive stagnation in the hot water ring line.

As a further design option, a valve for hydraulic balancing is installed in each of the floor lines, which are designed as ring lines. This ensures that when hot water is drawn, the cold and / or hot water flows via the line into the water heater and not only from the lines or ring lines that are closest to the water heater, but also from the lines that are the subject of further complications, which is a uniform one Flushing of the entire water supply system guaranteed.

A preferred embodiment consists in that a flushing valve is arranged at the ends of the stub lines to the consumers. This enables the drinking water to be replaced right down to the rear of the pipes. The flushing valve is preferably equipped with a flow, pressure and / or temperature sensor. This allows targeted flushing of the amount of drinking water that is stagnant in the line or to achieve a desired temperature when the temperature of the stagnant drinking water changes.

Alternatively, it is also possible to loop the consumers together in a ring line, as a result of which the drinking water can flow to the open consumer on both sides and flush all consumers before and after the open consumer. The ring lines on which the consumers are arranged preferably also have a flushing valve at the end, which can also be equipped with a flow, pressure and / or temperature sensor, for example after a predetermined time, without consumption or with less consumption than present in the ring line is to flush the line.

As a further configuration option, a cooling unit is arranged in the cold water line, this preferably being provided in a cold water line which is looped as a ring line and preferably has a pump for circulating the drinking water.

To optimize the energy consumption of the entire water supply system, a heat pump is preferably provided which feeds the heat extracted by means of a cooling unit which cools the cold water to the water heater.

All configuration options as well as components can be freely combined with one another, and the features of the water supply system and the method for operating the water supply system can be freely combined with one another.

Fig. 1

zeigt ein erfindungsgemässes Wasserleitungssystem für ein Gebäude, wobei die Warmwasserleitung als Ringleitung ausgebildet ist,

Fig. 2

zeigt ein erfindungsgemässes Wasserleitungssystem für ein Gebäude, wobei die Warmwasserleitung nicht als Ringleitung ausgebildet ist und

Fig. 3

zeigt ein erfindungsgemässes Wasserleitungssystem für ein Gebäude, wobei die Warmwasserleitung als Ringleitung ausgebildet ist und weitere mögliche Komponenten zur Optimierung der Durchströmung,

Fig. 4

zeigt ein erfindungsgemässes Wasserleitungssystem für ein Gebäude, wobei Ventile für den hydraulischen Abgleich in der Ringleitung und Spülventile am Ende der Steigleitungen vorgesehen sind,

Fig. 5

zeigt ein erfindungsgemässes Wasserleitungssystem für ein Gebäude, wobei Ventile für den hydraulischen Abgleich in der Ringleitung und Spülventile an den Enden der Ringleitungen der Verbraucher angeordnet sind und

Fig. 6

zeigt ein erfindungsgemässes Wasserleitungssystem für ein Gebäude, wobei ein Kühlaggregat im Wasserleitungssystem angeordnet ist.

Embodiments of the invention are described with reference to the figures, the invention not being limited to the embodiments, but the individual components being combinable with one another in different ways. Show it:

Fig. 1

shows an inventive water pipe system for a building, the hot water pipe being designed as a ring pipe,

Fig. 2

shows an inventive water pipe system for a building, the hot water pipe is not designed as a ring line and

Fig. 3

shows an inventive water pipe system for a building, the hot water pipe being designed as a ring pipe and other possible components for optimizing the flow,

Fig. 4

shows a water pipe system according to the invention for a building, valves for hydraulic balancing in the ring line and flushing valves being provided at the end of the risers,

Fig. 5

shows an inventive water pipe system for a building, valves for hydraulic balancing in the ring line and flushing valves are arranged at the ends of the ring lines of the consumer and

Fig. 6

shows a water pipe system according to the invention for a building, wherein a cooling unit is arranged in the water pipe system.

In the Fig. 1 The drawing shown shows a water pipe system 1 according to the invention for a building. The water pipe system 1 has at least one hot and one cold water pipe 2, 3. In Fig. 1 the hot water pipe is designed as a ring pipe, which back to the Water heater 4 leads. However, the water pipe system 1 can also have a hot water pipe 2 which is not designed as a ring pipe and does not lead back to the water heater 4 as in FIG Fig. 2 pictured. The cold water pipe 3 is connected on the inlet side to a water network 5. The water pipe system 1 according to the invention has a water heater 4, the water heater 4 being connected to the water heater 1. In Fig. 1 and 3rd the hot water line 2 is designed as a ring line and a possible variant is in Fig. 2 the hot water pipe is shown as a riser. On the hot and cold water pipes, consumers 6 are arranged for taking hot and / or cold water 2, 3. The figures only schematically show several floors 14 with consumers 6 arranged thereon, only one floor outlet 14 being possible. The cold water pipe 3 connects at the end or outlet side 7 to the water heater 4. This enables fresh water to be fed in from the cold water line 3, the fresh water first being led past the consumers through the entire cold water line 3 and, as a result, the cold water line 3 is also flushed through each time hot water is drawn in addition to the hot water line 2. Fig. 3 shows an embodiment variant of the water pipe system 1 according to the invention with various possible variants or further fittings which can be integrated into the water pipe system 1, not all of them together as in FIG Fig. 3 shown must be installed, but only some of the fittings can be installed.

The bypass valve 10 enables the fresh water to be fed directly into the water heater 4 and thus bypasses the long cold water line 3 with all the consumers 6 arranged thereon. This serves to ensure that the flow pressure is neither in the case of a simultaneous high removal of drinking water or fresh water Cold water pipe 3 still drops in the hot water pipe. A pressure reducing valve 10 is preferably used for this. A circulation pump 11 is used as a further element that can be installed in the water pipe system 1 according to the invention. This is preferably placed in the hot water line 2, the hot water line 3 then being designed as a ring line in order to allow the hot water to circulate at predetermined intervals, so that the drinking water is not in the line for too long.

As a further possible fitting, the water pipe system 1 can have a flushing valve 12 which is arranged in the cold water pipe 3 after the consumers 6 and before the water heater 4. This allows the possibility, for example, if the water heater 4 is full or for some other reason the fresh water is not to be directed into the water heater 4 and to lead the fresh water into the drain 9 via the flush valve 12. All these additional fittings as well as the pump can be freely combined and installed in the water pipe system 1.

Fig. 4 shows a further possible embodiment of the piping for hot and cold water, the ring lines 13 in the main branch of the cold and hot water 3, 2 having a valve 15 for the hydraulic balancing. This ensures that the drinking water or fresh water in the pipes that are further away from the water heater are also flushed out. As a further advantageous embodiment, the stub lines 18 on which the consumers 6 are arranged have flushing valves at the end, these preferably having a flow and / or temperature sensor so that it can be determined when the quantity to be flushed has been reached or when the desired temperature is restored .

As a further possible embodiment, there is the possibility of arranging the consumers 6 on a ring line 17, which has the advantage that the drinking water flows from both sides to the consumer 6 at the opened consumers 6 and thus all the consumers 6 or 6 arranged on the ring line 17 the entire ring line 17 is flushed, can be seen in Fig. 5 .

As a further possible combination of the components in a water pipe system, it is possible to provide a cooling unit 19. Such an exemplary installation is in Fig. 6 shown. The cold water line 3 is looped to form a ring line 13 and a circulation pump 11 is provided for moving the drinking water in the ring line 13. The cooling unit 19 lowers the temperature of the drinking water in the ring line 13 or the cold water line 3 in order to avoid contamination, the drinking water cooled by the cooling unit 19 is preferably circulated in the cold water line by means of a circulation pump 11 even if there is no withdrawal by a consumer or a Rinsing valve, a regular exchange of the drinking water or the temperature reduction can be guaranteed.

Reference symbol list

1

Water supply system

2nd

Hot water pipe

3rd

Cold water pipe

4th

Water heater

5

Grid feed-in

6

consumer

7

Cold water pipe on the end / outlet side / connection of the water heater

8th

Flow direction

9

Drain

10th

Bypass valve

11

Circulation pump

12

Flush valve

13

Loop

14

Floor string

15

Valve

16

Flow, pressure and / or temperature sensor

17th

Ring line consumer

18th

Branch line consumer

19th

Cooling unit

Claims (13)

Water pipe system (1) for a building with at least one hot and one cold water pipe (2, 3) for supplying consumers (6) arranged thereon, the cold water pipe being connected on the inlet side (3) to a supply network containing a water heater (4), The hot water line (2) is connected to the water heater (4) and is preferably designed as a ring line (13), characterized in that the cold water line (3) in the flow direction (8) to the water heater (6) after the consumers (6) arranged thereon. 4) is connected and supplies the water heater (4) with drinking water. Water pipe system (1) according to claim 1, characterized in that the water pipe system (1) has a circulation pump (11), the circulation pump (11) serving to move water in the pipes, the circulation pump (11) preferably being arranged in the hot water circuit (2) is. Water pipe system (1) according to one of claims 1 or 2, characterized in that the cold water pipe (3) is connected to the water heater (4) in the flow direction (8) after all consumers (6) arranged on the cold water pipe (3). Water pipe system (1) according to one of claims 1 to 3, characterized in that the cold water pipe is connected in the flow direction at the end or outlet side to the water heater. Water pipe system according to one of claims 1 to 4, characterized in that a bypass valve (10) is arranged on the cold water pipe (3), preferably upstream of the consumers (6), the bypass valve (10) providing a direct supply to the water heater (4) with cold water without having to rinse the entire cold water pipe (3). Water pipe system (1) according to claim 5, characterized in that the bypass valve (10) on the cold water pipe (3) is designed as a pressure reducing valve. Water pipe system (1) according to one of claims 1 to 6, characterized in that a flushing valve (12) is arranged on the cold water pipe (3) and / or hot water pipe (2). Water pipe system (1) according to claim 7, characterized in that the flushing valve (12) is arranged after the consumers (6) and before the water heater. Water pipe system (1) according to one of the preceding claims, characterized in that the water pipe system (2) has a cooling unit (19). Method for operating a water pipe system (1) in a building, with at least one hot and one cold water pipe (2, 3) for supplying consumers (6) arranged thereon, the cold water pipe (3) being connected on the inlet side to a supply network containing one Water heater (4), the hot water line being connected to the water heater (4) and preferably being in the form of a ring line (13), regular flushing of the hot and / or cold water line (2, 3) being carried out, characterized in that the Water heater (4) is connected to the cold water line (3) in such a way that when hot water is drawn from at least one consumer (6), the cold water line (3) is flushed. A method of operating a water pipe system (1) according to claim 10, characterized in that when flushing the cold water pipe (3), which is connected to the water heater (4), the water heater (4) is supplied with fresh water and the fresh water is flushed into the Runoff is avoided or reduced. A method of operating a water pipe system (1) according to claim 10 or 11, characterized in that in the case of a high flow pressure drop in the hot and / or cold water pipe (2, 3) the water heater (4) is fed directly via a bypass valve (10) . Method for operating a water pipe system (1) according to claim 10 to 12, characterized in that a movement of the water in the complete water pipe system (1) is generated by means of a circulation pump (11), preferably in the hot water pipe (2) which preferably as a ring pipe (13 ) is trained.

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