DE202005013441U1 - Water disinfection plant, especially for producing Legionella-free drinking water, based on disinfection and circulation circuits, with variable output pump and mixing valve to control product temperature - Google Patents

Abstract

In a plant for producing usable water (UW) of reduced bacteria content, having a disinfection circuit (DC) (3) with a fresh water feed line (17) and a circulation circuit (CC) (5) with a distribution line (37) to a UW recovery site (39) (connected to circulation pump (43) and UW collection line (45)), where the distribution line can be fed with UW extracted from DC via outlet line (33) and DC can be fed with UW via the collection line, (a) the rotational speed and/or output of the pump is variable (continuously and/or in small increments) in a specific range and (b) CC can be supplied directly with UW extracted from DC and/or the outlet line via a first mixing valve (35).

Description

The The invention relates to a plant for the provision of service water with at least reduced bacterial concentration, in particular of Legionella-free drinking water, with at least one disinfection cycle and at least one circulation circuit, wherein the disinfection cycle over at least a fresh water supply fresh water can be supplied, the circulation circuit at least one service water distribution line to at least one Withdrawal point for the delivery of process water from the circulation circuit, at least one circulation line from the at least one withdrawal point to a circulation pump and at least one service water collecting pipe from the circulating pump, the service water distribution pipe from the disinfection cycle via at least one service water outlet pipe taken hot water supplied is and the disinfection cycle hot water on the hot water collector supplied is.

A generic system is for example from the DE 42 35 038 C2 known. In 1 In this document, it is proposed that a service water collecting line of a circulation circuit opens into a fresh water supply line, wherein the fresh water supply line is in turn connected to a first path of a three-way mixing valve. A second path of the three-way mixing valve is connected to an input of a primary side of a heat exchanger, and a third way of this three-way mixing valve is connected to an access line to a disinfection circuit. In addition, an outgoing from the output of the primary side of the heat exchanger line also opens into the access line. The input of the secondary side of the heat exchanger is connected to a service water discharge line, via which the disinfection circuit dhw is withdrawn, wherein the output of the secondary side of the heat exchanger is connected to a hot water distribution line of the circulation circuit. The position of the three-way mixing valve is controlled in response to a temperature measured in the circulation circuit. By this control of the mixing valve to ensure that hot water at a predetermined temperature can be removed at corresponding removal points of the circulation circuit.

Disadvantageous in the DE 42 35 038 C2 However, it is shown that a constancy of the temperature of the service water is not ensured at a sampling point of the circulation circuit. If a too low temperature detected in the service water distribution line of the circulation circuit, the mixing valve is adjusted so that the water flowing through the fresh water inlet water is fed directly to the supply line bypassing the primary side of the heat exchanger, in particular to the cooling of the därseite by the därseite of the heat exchanger running hot water to reduce. However, such a control of the circulation water supplied to the circulation water is very sluggish, resulting in large temperature fluctuations of the process water at the sampling point of the circulation circuit.

task The present invention is therefore the generic system in such a way that the Disadvantages of the prior art are overcome, in particular a precise one Control or control of the temperature of the service water at a Removal point of the circulation circuit is ensured.

These Task is inventively characterized solved, that the Speed and / or flow rate the circulation pump in at least one speed range and / or delivery area essentially stepless and / or in a variety of discrete Individual steps can be controlled and / or regulated and the system further at least one connectable to the circulation circuit first Includes mixing valve, wherein the circulation circuit over the first mixing valve directly to the disinfection circuit and / or the service water outlet pipe taken hot water can be supplied.

With the invention is also proposed that the system characterized is by at least a first water heater, wherein by means of the first water heater the fresh water supplied to the disinfection cycle and / or Domestic hot water preheated is and / or at least a first water cooler, wherein by means of the first water cooler the process water taken from the disinfection cycle can be cooled.

Prefers is that the first water heater and the first water cooler are formed in one, in particular in the form of a first heat exchanger, wherein preferably the fresh water supply line and / or the service water collecting line with at least one input at least one primary side of the first heat exchanger and / or the disinfection cycle, in particular via at least one Access line, with at least one output of the primary side of first heat exchanger is connectable and / or the service water outlet with at least an input of at least one secondary side of the first heat exchanger and / or the service water distribution line with at least one Output of the secondary side of the first heat exchanger is connectable.

With the invention is also proposed that the service water manifold with the fresh water supply line, with the access line and / or with the disinfection circuit is connectable, in particular with the interposition of at least one backflow preventer and / or at least one Mengenbegrenzers. Of course, can be dispensed with the use of a Mengenbegrenzers without affecting the functioning of the system according to the invention.

In an advantageous embodiment can be provided that the Circulation circuit comprises at least one distribution valve, wherein by means of the distribution valve, the circulation line and / or the service water collecting line is connectable to the service water distribution line, preferably the distribution valve in the form of a valve with at least three ways is formed, in particular a first way of the distribution valve with the circulation line and / or the service water collecting line, a second way, especially about a first bypass line, with the service water distribution pipe and / or a third way communicates with the fresh water supply line and / or the access line.

Also is proposed with the invention that the first mixing valve in Form of a valve is formed with at least three paths.

A inventive plant may be characterized in that the first mixing valve via a first and a second way with the service water collection in Connection is arranged, in particular in the service water collection is.

alternative it can be provided that the first mixing valve over a first and a second path with the first bypass line is in communication, in particular arranged in the first bypass line is.

at the two aforementioned alternatives is preferred that the first Mixing valve over a third way, preferably over at least one second bypass line, communicates with the service water outlet pipe.

there is proposed with the invention that at least one backflow preventer in the service water outlet, in particular downstream of a junction the second bypass line, in the service water discharge pipe and / or in the service water distribution pipe, in particular between the first heat exchanger and the first Mixing valve, is arranged.

advantageously, the plant is characterized by at least a second mixing valve, wherein the disinfection cycle by means of the second mixing valve fresh water bypassing the first water heater can be supplied, in particular the Fresh water supply is connectable to the access line.

there is proposed with the invention that the second mixing valve in Form of a valve is formed with at least three ways, wherein preferably a first way connectable to the fresh water supply is, a second path is connectable to the access line and / or a third way is connectable to the first water heater, in particular with the input of the primary side the first heat exchanger, preferably also the outlet of the primary side of the first heat exchanger connectable to the access line.

Also sees the invention at least one with the service water distribution pipe operatively connected to the first transducer, wherein preferably at least one first transducer with the service water distribution line upstream of a mouth of the first bypass line in the hot water distribution pipe and at least a second first transducer with the service water distribution pipe downstream of a junction of the first bypass line in the service water distribution line is in operative connection.

Farther may be a plant according to the invention be characterized by at least one with the first bypass line operatively connected second transducers, at least one with the second bypass line operatively connected third transducers, at least one with the circulation line is operatively connected to the fourth transducer, at least one in operative connection with the service water collection fifth transducer and / or at least one operatively connected to the sampling point standing sixth transducer.

at the abovementioned alternatives are proposed with the invention, that means the at least one first, second, third, fourth, fifth and / or sixth transducer at least one temperature value, at least one flow rate value and / or at least one level of purity, such as a concentration of bacteria, especially the service water, is receivable.

A advantageous embodiment the invention provides that the Disinfection cycle at least a second water heater, preferably in Shape of at least one second heat exchanger, at least a charge pump, at least one flow rate limiter, at least a backflow preventer, at least one service water storage and / or at least one buffer includes.

there is particularly provided that the speed and / or delivery rate the charge pump in at least one speed range and / or flow range essentially stepless and / or in a variety of discrete Individual steps controlled and / or regulated, preferably the speed and / or flow rate the charge pump depending from the speed and / or flow rate of Circulation pump and / or the speed and / or the flow rate the circulation pump in dependence from the speed and / or the flow rate the charge pump is controlled and / or regulated.

Also it is preferred that the Speed and / or the flow rate the circulation pump, the speed and / or the flow rate the charge pump, the position of the first mixing valve, the position of the second mixing valve and / or the position of the distribution valve dependent on at least one by means of the at least one first, second, third, fourth, fifth and / or sixth transducer recorded measured value is taxable and / or regulated or are.

Also sees an advantageous embodiment of the Invention that the Circulation pump and / or the charge pump in a variety of speed and / or flow ranges, preferably over essentially the entire speed and / or flow range, is taxable and / or regulated or are.

Finally will proposed with the invention that the sampling point with at least A distribution circuit is connectable, wherein the distribution circuit in particular at least one dispensing device, at least one circulating pump and / or at least one service water treatment device, such as at least a UV radiation source and / or at least a third water heater, such as a third heat exchanger, in particular for transmission of heat from the disinfecting circuit into the distribution circuit.

Of the Invention is thus the surprising finding based on that the two measures, that the Circulation cycle over a mixing valve directly to the disinfection circuit and / or the service water outlet pipe drawn tap water feedable is and the flow rate and / or the rotational speed of a circulating pump arranged in the circulation circuit is largely stepless controlled and / or regulated, namely especially about the entire flow range, the temperature of the service water at a Ent removal point of the circulation circuit can be kept within narrow limits. Here is under a direct removal in the sense of the invention understood that the supply of the Service water from the disinfection cycle or the service water outlet pipe into the service water distribution line, bypassing at least one further possibly existing heat exchanger, in which there is a cooling the process water comes, takes place. Further, under a stepless Controllability of a pump according to the invention understood, that the Speed or the flow rate changed in any small steps can be, with the minimum distance of the steps only by control technology Specifications or the feasibility limits of a continuous control limited is. Such restrictions can for example, by a digital control of an electronic Regulation of the pump to be specified.

By these measures according to the invention, the water is kept within the circulation circuit at a predefined constant temperature, so that also located in the service water outlet pipe service water is at this constant temperature. Thus, the temperature within the circulation circuit, in particular at a removal point for the process water, can be precisely controlled or regulated by the mixing of the service water with a constant temperature in the circulation circuit. At the same time supplied in the circulation circuit, the service water discharge line directly removed hot water amount can be adjusted by the control or regulation of the delivery rate of the circulation pump. Thus, in the case of a lack of removal of service water from the circulation circuit by a high circulation rate of the water in the circulation circuit can be ensured that the service water in the circulation circulation is substantially at a constant temperature. If, however, it comes to a removal of hot water from the circulation circuit, the flow rate of the circulation pump can be reduced so that the flowing into the service water distribution line from the disinfection cycle tap water flows out of the circulation circuit essentially exclusively via the sampling point, without further on the circulation pump, especially in the circulation line and / or the service water collecting line to be circulated. Thus arises from the adjustability of the flow rate of the circulation pump and the ability to circulate the circulating water without detours the disinfection cycle supplied hot water, the possibility of precise temperature setting of the service water within the circulation circuit both at a withdrawal of service water from the circulation circuit via a sampling point and at a missing withdrawal. This adjustment of the temperature of the service water within the circulation circuit can in particular without further manual Interventions in the system are made so that a substantially complete remote control of the system can be realized. Thus, both the mixing valve and the circulation pump can be controlled and / or regulated substantially steplessly from a remote control station.

Further Features and advantages of the invention will become apparent from the following Description, in the preferred embodiments of the invention by way of example are explained with reference to schematic drawings. Showing:

1 a partial circuit diagram of a system according to a first embodiment of the invention with a distribution valve in a circulation circuit;

2 a partial circuit diagram of a system according to a second embodiment of the invention with a heat exchanger for supplying fresh water to a disinfection circuit after preheating;

3a a partial circuit diagram of a system according to a third embodiment of the invention with a distribution valve in a circulation circuit and arranged in a hot water distribution line mixing valve;

3b a modification of the plant of 3a in which a mixing valve is arranged in a first bypass line; and

3c another modification of the plant 3a in which a further mixing valve is arranged in a fresh water supply line.

In 1 is a first embodiment of a system according to the invention 1 shown. The attachment 1 includes a disinfection cycle 3 and a circulation circuit 5 , The disinfection cycle 3 essentially comprises a water heater in the form of a heat exchanger 7 with the the disinfection cycle 3 supplied fresh water to a disinfection temperature to kill bacteria present in the fresh water, as Legionella is heated or held in the disinfection cycle existing hot water at this disinfection temperature, a charge pump 9 , a store 11 and a buffer 13 , In addition to heating the process water, other or alternative methods for killing bacteria in the disinfection cycle may additionally or alternatively 3 be used, for example, irradiation with high-energy radiation, such as UV, microwave or X-rays. In the in 1 illustrated embodiment of the invention are the memory 11 and the buffer 13 in the form of a reaction vessel 15 educated. The disinfection cycle 3 is via a fresh water supply 17 , wherein the supply amount via a valve 19 is adjustable, fed. The supplied fresh water flows via a supply line 21 in the disinfection cycle 3 , In this embodiment, the fresh water feed takes place via the heat exchanger 7 , In the in 1 illustrated plant 1 Furthermore, the fresh water can be controlled by appropriate control of valves 23 . 25 one over the valve 25 to the access line 21 connected, not shown fresh water tank can be supplied.

The fresh water supplied to the disinfection cycle is supplied via the charge pump 9 the reaction vessel 15 after heating in the heat exchanger 7 fed. It can be in the line from the charge pump 9 to the reaction vessel 15 a return stopper 27 , a flow restrictor 29 and / or a valve 31 be provided. Due to the heating of the water in the heat exchanger 7 are in the in the reaction vessel 15 existing water bacteria, especially ligons, are killed essentially completely. It is about the backflow preventer 27 , the flow limiter 29 as well as the valve 31 make sure that through the reaction vessel 15 running amount of water is limited so that a desired concentration of bacteria can be achieved, even in the case where the water does not continue through the disinfection cycle 3 is circulated but directly to the reaction vessel 15 via a service water outlet pipe 33 is removed. The about the service water outlet pipe 33 the disinfection cycle 3 taken hot water is via a mixing valve 35 the circulation circuit 5 fed. The circulation circuit 5 includes a service water distribution pipe 37 , several tapping points in the form of taps 39 that the service water via the hot water distribution pipe 37 is supplied, and at least one circulation line 41 about which the tap 39 with a circulation pump 43 are connected. The circulation pump 43 is about a service water collection 45 with a distribution valve 47 connected. It should be noted that the facility 1 Although only a circulation line 41 and a circulation pump 43 but the invention is not limited thereto. So can over the hot water distribution line 37 a plurality of circulation pipes, each having extraction points, are supplied with hot water. Advantageously, each individual circulation line has its own circulation pump. In particular, in these embodiments, not shown, the outputs of the respective circulation pumps are combined in a service water collecting line.

Again 1 can still be seen, the distribution valve 47 be designed in the form of a three-way valve, wherein two ways of the distribution valve 47 with the service water collection line 45 communicate while the third way with a bypass line 49 connected is. By means of the bypass line 49 is it possible that via the circulation pump 43 circulated water of the service water distribution pipe 37 supply. As 1 it can also be seen, is the service water collection 45 via a backflow preventer 51 with the fresh water supply 17 connected.

According to the invention, it is in the circulation pump 43 to a pump whose speed and / or flow rate is substantially continuously controlled and / or regulated. In particular, it is an UPE pump, ie an electronically controlled pump with volume control. As explained below, the use of such a controllable circulation pump 43 along with the use of the mixing valve 35 cause the temperature of the hot water in the circulation circuit 5 , especially at the sampling points 39 can be precisely controlled or regulated. So it comes with a circulation of the process water in the circulation circuit 5 to a cooling of the same. In the case of a lack of removal of service water from the circulation circuit 5 via the sampling points 39 but can by reducing the flow rate of the circulation pump 43 a cooling of the process water in the service water distribution pipe 37 be reduced, in which the over the bypass line 49 into the service water distribution pipe 37 supplied cooler amount of water is reduced. This control option also has an energetic positive effect, as that of the service water distribution pipe 37 over the bypass line 49 supplied amount of water through the distribution valve 37 can be reduced, however, with an unchanged continued operation of the circulation pump 43 this water over the backflow preventer 51 the fresh water supply 17 and thus the disinfection cycle 3 would have to be fed to be reheated there without a withdrawal of hot water on the sampling points 39 he follows. In addition, after a successful removal of hot water via the sampling point 39 the flow rate of the circulation pump 43 be increased to cool the located in the hot water distribution line, warmer hot water. If, however, a heating of the in the service water distribution line 37 located hot water necessary, so can through an opening of the mixing valve 35 the circulation circuit 5 warm water from the disinfection cycle 3 be supplied by the valve 35 opened, the flow rate of the circulation pump 43 increased as well as the return of service water from the service water collection 45 through the bypass line 49 by means of a change in the setting of the distributor valve 47 is reduced.

Thus, the direct supply of hot water from the service water outlet allows 33 and the adjustability of the flow rate of the circulation pump 43 precise adjustment of the temperature of the service water within the circulation circuit 5 , especially at the sampling points 39 ,

The attachment 1 know in an advantageous modification, especially in the field of fresh water supply 17 a water heater, not shown. This ensures that the usually cold fresh water before being fed into the disinfection cycle 3 is preheated to ensure that even with a direct passage of water through the disinfection cycle 3 in the case of removal of service water via the extraction points 39 a desired sufficient reduction of the bacterial concentration is achieved.

Advantageously, this water heater is designed in the form of a heat exchanger. Such an embodiment is in 2 shown. 2 shows a plant 1' , Elements of the plant 1' that with those of 1 illustrated plant 1 match, carry the same reference numerals, while dissimilar elements simply carry primed reference numerals. In contrast to the plant 1 is in the plant 1' a fresh water supply 17 ' via a heat exchanger 53 ' with an access line 21 ' leading to the disinfection cycle 3 leads, connected. While the primary side of the heat exchanger 53 ' with the fresh water supply 17 ' is connected, is a secondary side of the heat exchanger 53 ' with a service water outlet pipe 33 ' , about the process water from the disinfection cycle 3 is removable, connected. Further, the secondary side of the heat exchanger 53 ' with a service water distribution pipe 37 ' a circulation circuit 5 ' connected. The heat exchanger 53 ' allows it via the fresh water supply 17 ' supplied fresh water by cooling by the hot water outlet pipe 33 ' into the service water distribution pipe 37 ' flowing hot water is heated. In addition to the use of a heat exchanger 53 ' the system is different 1' furthermore from the plant 1 daduch that a mixing valve 35 ' is designed as a three-way valve. Here is the mixing valve 35 ' within the service water distribution pipe 37 ' arranged in such a way that a third way of the mixing valve 35 ' with a bypass line 55 ' connected is. The bypass line 55 ' is also with the service water outlet pipe 33 ' connected.

By this inventive compound of the service water distribution line 37 ' with the service water outlet pipe 33 ' is combined with the controllability of the flow rate of the circulation pump 43 in the following way, the adjustability of the temperature within the circulation circuit 5 ' elevated:
Does it come to a withdrawal of hot water via the sampling point 39 so it comes to a flow of fresh water through the fresh water supply 17 ' and the heat exchanger 53 ' , Through the heat exchanger 53 ' Furthermore, a preheating of this fresh water is achieved, but at the same time causes that through the secondary side of the heat exchanger 53 ' from the service water outlet pipe 33 ' flowing hot water is cooled. At too low temperatures of the fresh water supply 17 ' supplied fresh water, it may cause excessive cooling of the out of the service water outlet pipe 33 ' through the secondary side of the heat exchanger 53 ' come running water. To prevent the temperature of the service water at the sampling points 39 falls below a setpoint, by appropriate control of the mixing valve 35 ' from the heat exchanger 53 ' into the service water distribution pipe 37 ' running hot water via the bypass line 55 ' from the service water outlet 33 ' mixed directly drawn hot water. The mixing valve 35 ' thus allows an optional bypass of the heat exchanger 53 ' , To a backflow of through the bypass line 55 ' into the service water distribution pipe 37 ' running hot water in the heat exchanger 53 ' can prevent in the service water outlet pipe 33 ' especially between the heat exchanger 53 ' and a junction of the bypass line 55 ' a backflow preventer 57 ' be provided.

Another way to control the temperature of the tapping points 39 from the circulation circuit 5 ' Removable hot water results from the fact that when removing the flow rate of the circulation pump 43 can be increased. This increase be acts that through the fresh water supply 17 ' incoming fresh water, a larger proportion of service water via the hot water collector 45 ' from the circulation circuit 5 ' is admixed, so that in this way a heating of the disinfection cycle 3 via the access line 21 ' supplied water is achieved. Furthermore, this causes the temperature difference within the heat exchanger 53 ' reduced, resulting in an increase of the through the service water distribution pipe 37 ' flowing hot water results.

In 3a is a third embodiment of the invention in the form of a plant 1'' shown. Elements of the plant 1'' that with those of the plant 1' match, bear the same reference numerals. Compared to the plant 1' know the plant 1'' a modified circulation circuit 5 '' on. So is in a service water collection 45 '' a distribution valve in the form of a three-way valve 47 '' arranged. Via the distribution valve 47 '' is the service water collection 45 '' by means of a bypass line 49 '' with the service water distribution pipe 37 ' connected. In addition, the service water collection pipe 45 '' unlike the plant 1' not with the fresh water supply 17 '' but an access line 21 '' connected. This ensures that from the circulation circuit 5 '' originating service water bypassing the heat exchanger 53 ' in the disinfection cycle 3 arrives. This offers the advantage that, if a cooling of the through the service water discharge pipe 33 ' supplied service water through the heat exchanger 53 ' during a withdrawal of domestic hot water through the sampling points 39 is to be achieved, a preheating of the fresh water in the fresh water supply 17 '' through from the circulation circuit 5 '' originating service water is avoided and so in the heat exchanger 53 ' a maximum temperature difference between the primary and secondary side can be achieved.

In the following, now the regulation for controlling the temperature of the service water within the circulation circuit 5 '' explained.

It is initially based on the situation that no removal of hot water on the sampling points 39 he follows. For setting the temperature of the service water within the circulation circuit 5 '' are inside the service water distribution pipe 37 ' Transducer in the form of temperature sensors 59 '' and 61 '' arranged or stand with the hot water distribution pipe 37 ' in active connection. The temperature of the over the service water outlet pipe 33 ' the circulation circuit 5 '' supplied hot water is, if no removal of hot water through the sampling points 39 takes place and thus no fresh water on the fresh water supply 17 '' passing through the heat exchanger 53 ' a cooling of the service water of the service water outlet pipe 33 ' causes, takes place, higher than a target temperature within the service water distribution line 37 ' , especially in the area of sampling points 39 , The temperature of the over the hot water outlet pipe 33 ' supplied service water is via a temperature sensor 59 '' added. To the over the temperature sensor 61 '' recorded temperature of the service water in the service water distribution pipe 37 ' on the one hand, the mixing valve is firstly to be reduced 35 ' so controlled that no admixture of hot water through the bypass line 55 ' into the service water distribution pipe 37 ' but over the heat exchanger 53 ' takes place, whereby a first cooling of the circulation circuit 5 '' supplied service water takes place. Is that over the temperature sensor 59 '' measured temperature continues above a desired target value so the flow rate of the circulation pump 43 increase. This will on the one hand achieved that on the bypass line 49 '' a greater amount of through the circulation through the circulation circuit 5 '' cooled service water from the service water collection line 45 '' into the service water distribution pipe 37 ' is fed and so the temperature of the hot water distribution line 37 ' existing domestic water, via the measuring sensor 61 '' is measured, is reduced. In a modification of the system, not shown 1'' in which the service water collection 45 '' with the fresh water supply 17 '' is connected, it is also achieved that the means of the hot water outlet pipe 33 ' the service water distribution pipe 37 ' supplied service water can be cooled by the fact that due to the supply of cooler service water in the primary side of the heat exchanger 53 ' a stronger cooling on the secondary side of the heat exchanger 53 ' is reached.

In the following, the case is now considered that on the sampling points 39 the circulation circuit 5 '' Industrial water is removed. With the removal of hot water via the sampling points 39 becomes the valve 19 opened and thus via the fresh water supply 17 '' the plant 1'' Cool fresh water is supplied. This is in the heat exchanger 53 ' preheated to overload the disinfection cycle 3 to avoid by supplying too cold water. With the supply of cold fresh water through the heat exchanger 53 ' However, there is a greater cooling of service water, which is the heat exchanger 53 ' goes through on the secondary side. This can cause the over the temperature sensor 59 '' measured temperature less than the desired target temperature of the service water within the circulation circuit 5 '' is. In this case, first the mixing valve 35 ' controlled such that the over the bypass line 55 ' the service water distribution pipe 37 ' supplied amount of hot water is increased. Since that over the bypass line 55 ' from the service water outlet pipe 33 ' removed service water bypassing the heat exchanger 53 ' the service water distribution pipe 37 ' is supplied to the temperature sensor 59 '' measured temperature are increased so far that the desired target value at the temperature sensor 61 '' is reached.

In 3b is a variation of the in 3a illustrated plant 1'' in the form of a plant 1''' shown. Compared to the plant 1'' unchanged elements are in the plant 1''' marked with the same reference numerals.

The attachment 1''' differs essentially from the plant 1'' in that a mixing valve 35 ''' in a bypass line 49 ''' is arranged. The mixing valve 35 ''' connects the bypass line 49 ''' via a bypass line 55 ''' with the service water outlet pipe 33 ' , In addition, a service water collection pipe opens 45 ''' in a fresh water supply 17 ''' ,

In the following, now the control of the hot water temperature within the circulation circuit 5 ''' explained. By means of the sensor 61 '' the temperature within the branch of the service water distribution pipe 37 ''' detected downstream of a junction of the bypass line 49 ''' lies. For example, in the case in which over a longer period no hot water the circulation circuit 5 ''' is removed, it can cause a cooling of the circulation pump 43 , the domestic water collection 45 ''' , the bypass line 49 ''' as well as the service water distribution line 37 ''' circulated service water come. By controlling the mixing valve 35 ''' in the way that the bypass line 49 ''' directly to the service water outlet 33 ' over the bypass line 55 ''' taken hot water is supplied, due to the relatively high temperature of this supplied hot water, a rapid increase in the over the measuring sensor 61 '' measured service water temperature can be achieved. By simultaneously increasing the delivery rate of the circulation pump 43 is also achieved that the fastest possible equalization of the temperature of the service water within the circulation circuit 5 ''' is achieved, thereby ensuring that the desired temperature at the sampling points 39 achieved as soon as possible.

Is, however, within the circulation circuit 5 ''' too high a temperature of the service water before, so can by increasing the flow rate of the circulation pump 43 a stronger recirculation of the in the service water collecting line 45 ''' existing domestic water, which is usually a lower temperature than that in the hot water distribution pipe 37 ''' existing water has to be reached, and thus the on the measuring sensor 61 ''' measured temperature of the service water at the sampling points 39 be reduced. At the same time causes an increase in the flow rate of the circulation pump 43 that through the primary side of the heat exchanger 53 ' flowing amount of water is increased, thereby passing through the secondary side of the heat exchanger 53 ' from the service water outlet pipe 33 ' flowing hot water is cooled more and the over the measuring sensor 59 '' Measured flow temperature is reduced, so that the fastest possible adjustment of the temperature of the service water, via the measuring sensor 61 '' is reached is achieved.

In 3c is finally a variation of in 3a illustrated plant 1'' in the form of a plant 1'''' shown. Compared to the plant 1'' unchanged elements are in the plant 1'''' With the same reference numerals.

The attachment 1'''' differs essentially from the plant 1'' in that another mixing valve 63 '''' is provided. This mixing valve 63 '''' is in the plant 1'''' through a three-way valve, which in the fresh water supply 17 '''' is arranged, realized. Again 3c can be seen, opens a path of the mixing valve 63 '''' into the access line 21 '''' , Through this interconnection of the mixing valve 63 '''' can water, which via the fresh water supply 17 '''' the plant 1'''' is fed, optionally via the heat exchanger 53 ' the access line 21 '''' or the access line 21 '''' directly bypassing the heat exchanger 53 ' be supplied. In particular, in the case that on the sampling points 39 the circulation circuit 5 '''' Discharged water, it allows the mixing valve 63 '''' which preferably depends on the measured values of the sensors 59 '' respectively. 61 '' is set, the cooling of process water, which is the heat exchanger 53 ' on the secondary side of the service water outlet pipe 63 ' to the service water distribution line 37 ' goes through, reduce. This will be part of the fresh water supply 17 '''' supplied fresh water, bypassing the heat exchanger 53 ' from the fresh water supply 17 '''' into the access line 21 '''' directed. Although, as mentioned above, the regulation via the mixing valve 63 '''' is sluggish, are the control options for adjusting the temperature of the sampling points 39 taken hot water in the plant 1'''' by using it in combination with the first mixing valve 35 ' elevated.

In a further, not shown embodiment of the system 1'''' may also be provided that the service water manifold 45 '''' between the mixing valve 63 '''' and the heat exchanger 53 ' into the fresh water access line 17 '''' empties. This ensures that the disinfection cycle 3 from the circulation circuit 5 '''' supplied service water always the heat exchanger 53 ' goes through, and so a cooling of the Se kundärseite the heat exchanger 53 ' caused by flowing hot water, but the degree of cooling is adjustable by the fact that the addition of fresh water to this from the circulation circuit 5 '''' originating service water by means of the mixing valve 63 '''' is adjustable.

In further, not shown embodiments of the invention is in addition to the speed and / or the flow rate of the circulation pump also the speed and / or the flow rate the charge pump substantially continuously controlled and / or regulated. In this case, the setting of the speed and / or the flow rate the charge pump in particular as a function of the speed and / or the output the circulation pump or in reverse dependence. By this measure can the system to different load requirements or heating capacities one with the heat exchanger of Disinfection cycle are operatively connected in heat source adapted. So can the speed and / or flow the charging pump are adapted to the heating power of this heating source, that one quickly as possible and safe disinfection of the process water in the disinfection cycle is ensured. Furthermore, the speed is advantageously and / or the flow rate the charge pump and the circulation pump are coordinated that the output the circulation pump amounts to a maximum of 50% of the delivery rate of the charge pump. Thereby will ensure that in the Disinfection cycle incoming fresh water not immediately in can shoot through the circulation circuit without a sufficient Disinfection of this water is ensured.

It So for the first time according to the invention a plant for the provision of service water with at least reduced Bacterial concentration provided, which is a fast and precise Control or regulation of the temperature of the system taken Hot water allows.

The in the above description, in the drawings and in the claims disclosed features of the invention can both individually and also in any combina tion for the realization of the invention in its different embodiment be essential.

1, 1 ', 1' ', 1' '', 1 '' ''

investment

3

Disinfection cycle

5, 5 ', 5' ', 5' '', 5 '' ''

Circulation circuit

7

heat exchangers

9

charging pump

11

Storage

13

buffer

15

reaction vessel

17 17 ', 17' ', 17' '', 17 '' ''

Freshwater supply

19

Valve

21 21 ', 21' ', 21' '', 21 '' ''

access line

23

Valve

25

Valve

27

Return inhibitor

29

Flow limiter

31

Valve

33 33 '

Rain water outlet pipe

35, 35 ', 35' ''

mixing valve

37, 37 ', 37' ''

Water distribution line

39

sampling point

41

circulation line

43

circulation pump

45, 45 ', 45' ', 45' '', 45 '' ''

Water manifold

47 47 '

distribution valve

49, 49 '', 49 '' '

bypass line

51

Return inhibitor

53 '

heat exchangers

55 ', 55' ''

bypass line

57 '

Return inhibitor

59 ''

temperature sensor

61 ''

temperature sensor

63 '' ''

mixing valve

Claims (20)

Investment ( 1 . 1' . 1'' . 1''' . 1'''' ) for the provision of process water with at least reduced bacterial concentration, in particular of legionella-free drinking water, with at least one disinfection cycle ( 3 ) and at least one circulation circuit ( 5 . 5 ' . 5 '' . 5 ''' . 5 '''' ), whereby the disinfection cycle ( 3 ) via at least one fresh water supply line ( 17 . 17 ' . 17 '' . 17 ''' . 17 '''' ) Fresh water can be supplied, the circulation circuit ( 5 . 5 ' . 5 '' . 5 ''' . 5 '''' ) at least one service water distribution line ( 37 . 37 ' . 37 ''' ) to at least one sampling point ( 39 ) for the delivery of process water from the circulation circuit ( 5 . 5 ' . 5 '' . 5 ''' . 5 '''' ), at least one circulation line from the at least one sampling point ( 39 ) to a circulation pump ( 43 ) and at least one service water collecting line ( 45 . 45 ' . 45 '' . 45 ''' . 45 '''' ) from the circulation pump ( 43 ), the service water distribution line ( 37 . 37 ' . 37 ''' ) from the disinfection cycle ( 3 ) via at least one service water discharge line ( 33 . 33 ' ) and the disinfection cycle ( 3 ) Service water via the service water collecting line ( 45 . 45 ' . 45 '' . 45 ''' . 45 '''' ) can be supplied, characterized in that the rotational speed and / or delivery rate of the circulation pump ( 43 ) in at least one speed range and / or flow range substantially continuously and / or in a plurality of discrete steps controllable and / or regulated and the system ( 1 . 1' . 1'' . 1''' . 1'''' ) at least one with the circulation circuit ( 5 . 5 ' . 5 '' . 5 ''' . 5 '''' ) connectable first mixing valve ( 35 . 35 ' . 35 ''' ), wherein the circulation circuit ( 5 . 5 ' . 5 '' . 5 ''' . 5 '''' ) via the first mixing valve ( 35 . 35 ' . 35 ''' ) directly to the disinfection cycle ( 3 ) and / or the service water supply line ( 33 . 33 ' ) withdrawn service water can be supplied. Plant according to claim 1, characterized by at least one first water heater ( 53 ' ), wherein by means of the first water heater ( 53 ' ) that the disinfection cycle ( 3 ) supplied fresh water and / or service water is preheated and / or at least a first water cooler ( 53 ' ), whereby by means of the first water cooler ( 53 ' ) that the disinfection cycle ( 3 ) removed hot water is cooled. Installation according to claim 2, characterized in that the first water heater and the first water cooler are formed in one, in particular in the form of a first heat exchanger ( 53 ' ), wherein preferably the fresh water supply ( 17 . 17 ' . 17 '' . 17 ''' . 17 '''' ) and / or the service water collecting line with at least one input at least one primary side of the first heat exchanger ( 53 ' ) and / or the disinfection cycle ( 3 ), in particular via at least one access line ( 21 . 21 ' . 21 '' . 21 ''' . 21 '''' ), with at least one output of the primary side of the first heat exchanger ( 53 ' ) is connectable and / or the service water discharge line ( 33 ' ) with at least one input of at least one secondary side of the first heat exchanger ( 53 ' ) and / or the service water distribution line ( 37 ' . 37 ''' ) with at least one output of the secondary side of the first heat exchanger ( 53 ' ) is connectable. Installation according to one of the preceding claims, characterized in that the service water collecting line ( 45 . 45 ' . 45 '' . 45 ''' . 45 '''' ) with the fresh water supply ( 17 . 17 ' . 17 ''' . 17 '''' ), with the access line and / or with the disinfecting circuit is connectable, in particular with the interposition of at least one backflow preventer and / or at least one Mengenbegrenzers. Installation according to one of the preceding claims, characterized in that the circulation circuit ( 5 . 5 '' . 5 ''' . 5 '''' ) at least one distribution valve ( 47 . 47 '' ), wherein by means of the distribution valve ( 47 . 47 ' ) the circulation line ( 41 ) and / or the service water collection line ( 45 . 45 '' . 45 ''' . 45 '''' ) with the service water distribution line ( 37 . 37 ' . 37 ''' ) is connectable, preferably the distribution valve ( 47 . 47 '' ) is formed in the form of a valve with at least three paths, wherein in particular a first way of the distribution valve ( 47 . 47 '' ) with the circulation line ( 41 ) and / or the service water collection line ( 45 . 45 '' . 45 ''' . 45 '''' ), a second path, in particular via a first bypass line ( 49 . 49 '' . 49 ''' ), with the service water distribution line ( 37 . 37 ' . 37 ''' ) and / or a third way with the fresh water supply ( 17 . 17 ' . 17 ''' . 17 '''' ) and / or the access line ( 21 '' ). Plant according to one of the preceding claims, characterized in that the first mixing valve ( 35 ' . 35 '' ) is formed in the form of a valve with at least three paths. Plant according to claim 6, characterized in that the first mixing valve ( 35 ' ) via a first and a second way with the service water collecting line ( 37 ' ), in particular in the service water collection line ( 37 ' ) is arranged. Plant according to claim 6, characterized in that the first mixing valve ( 35 ''' ) via a first and a second path with the first bypass line ( 49 ''' ), in particular in the first bypass line ( 49 ''' ) is arranged. Installation according to one of claims 7 or 8, characterized in that the first mixing valve ( 35 ' . 35 '' ) via a third path, preferably via at least one second bypass line ( 55 ' . 55 ''' ), with the service water supply line ( 33 ' ). Plant according to claim 9, characterized in that at least one backflow preventer ( 57 ) in the service water supply line ( 33 ' ), in particular downstream of a junction of the second bypass line ( 55 ' ), in the service water supply line ( 33 ' ) and / or in the service water distribution line, in particular between the first heat exchanger ( 53 ' ) and the first mixing valve ( 35 ' ) is arranged. Plant according to one of the preceding claims, further characterized by at least one second mixing valve ( 63 ''' ), whereby the disinfection cycle ( 3 ) by means of the second mixing valve ( 63 '''' ) Fresh water bypassing the first water heater ( 53 ' ) can be supplied, in particular the fresh water supply ( 17 ''' ) with the access line ( 21 '''' ) is connectable. Plant according to claim 11, characterized in that the second mixing valve ( 63 ''' ) is formed in the form of a valve with at least three paths, preferably a first way with the fresh water supply ( 17 '''' ), a second way with the access line ( 21 '''' ) is connectable and / or a third way with the first water heater is connectable, in particular with the input of the primary side of the first heat exchanger ( 53 ' ), wherein preferably also the output of the primary side of the first heat exchanger ( 53 ' ) with the access line ( 21 '''' ) is connectable. Installation according to one of the preceding claims, characterized by at least one with the service water distribution line ( 37 ' . 37 ''' ) are operatively connected to first transducers ( 59 '' . 61 '' ), wherein preferably at least one first transducer ( 59 '' ) with the service water distribution line ( 37 ' . 37 ''' ) upstream of an opening of the first bypass line ( 49 '' . 49 ''' ) into the service water distribution line ( 37 ' . 37 ''' ) and at least a second first transducer ( 61 '' ) with the service water distribution line ( 37 ' . 37 ''' ) downstream of a junction of the first bypass line ( 49 '' . 49 ''' ) into the service water distribution line ( 37 ' . 37 ''' ) is in operative connection. Plant according to one of the preceding claims, characterized by at least one operatively connected to the first bypass line stationary second transducer, at least one operatively connected to the second bypass line stationary third transducer, at least one in operative connection with the circulation line fourth transducer, at least one in operative connection with the service water collection fifth Transducer and / or at least one operatively connected to the sampling point standing sixth transducer. Plant according to claim 13 or 14, characterized in that by means of the at least one first ( 59 '' . 61 '' ), second, third, fourth, fifth and / or sixth transducer at least one temperature value, at least one Durchflußmengenwert and / or at least one purity value, such as a bacterial concentration, in particular of the service water, is receivable. Plant according to one of the preceding claims, characterized in that the disinfection cycle ( 3 ) at least one second water heater, preferably in the form of at least one second heat exchanger ( 7 ), at least one charge pump ( 9 ), at least one flow rate limiter ( 29 ), at least one backflow preventer ( 27 ), at least one hot water tank ( 11 ) and / or at least one buffer ( 13 ). Plant according to claim 16, characterized in that the speed and / or delivery rate of the charge pump ( 9 ) in at least one speed range and / or flow range substantially continuously and / or in a plurality of discrete steps controllable and / or regulated, wherein preferably the speed and / or flow rate of the charge pump ( 9 ) as a function of the speed and / or delivery rate of the circulation pump ( 43 ) and / or the speed and / or the delivery rate of the circulation pump ( 43 ) as a function of the speed and / or the delivery rate of the charge pump ( 9 ) is taxable and / or regulated. Installation according to one of the preceding claims, characterized in that the speed and / or the delivery rate of the circulation pump ( 43 ), the speed and / or delivery rate of the charge pump ( 9 ), the position of the first mixing valve ( 35 . 35 ' . 35 ''' ), the position of the second mixing valve ( 63 '''' ) and / or the position of the distributor valve ( 47 . 47 '' ) as a function of at least one by means of the at least one first ( 59 '' . 61 '' ), second, third, fourth, fifth and / or sixth measured values the measured value recorded is controllable and / or controllable. Plant according to one of the preceding claims, characterized in that the circulation pump ( 43 ) and / or the charge pump ( 9 ) is in a variety of speed and / or flow areas, preferably over substantially the entire speed and / or flow rate range, is controlled and / or regulated or are. Plant according to one of the preceding claims, characterized characterized in that Removal point with at least one distribution circuit connectable is, wherein the distribution cycle in particular at least one Tap device, at least one circulation pump and / or at least a service water treatment device, such as at least one UV radiation source and / or at least a third water heater, such as a third heat exchanger, in particular for transmission of heat from the disinfecting circuit into the distribution circuit.