EP3372904A1 - Installation de circulation - Google Patents

Installation de circulation Download PDF

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Publication number
EP3372904A1
EP3372904A1 EP18159504.2A EP18159504A EP3372904A1 EP 3372904 A1 EP3372904 A1 EP 3372904A1 EP 18159504 A EP18159504 A EP 18159504A EP 3372904 A1 EP3372904 A1 EP 3372904A1
Authority
EP
European Patent Office
Prior art keywords
circulation pump
circulation
riser
water
circulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18159504.2A
Other languages
German (de)
English (en)
Inventor
Oliver Kuhnt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP3372904A1 publication Critical patent/EP3372904A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/0078—Recirculation systems
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/04—Domestic or like local pipe systems
    • E03B7/045—Domestic or like local pipe systems diverting initially cold water in warm water supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/0073—Arrangements for preventing the occurrence or proliferation of microorganisms in the water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/0089—Additional heating means, e.g. electric heated buffer tanks or electric continuous flow heaters, located close to the consumer, e.g. directly before the water taps in bathrooms, in domestic hot water lines

Definitions

  • the present invention relates to a circulating system for drinking water with a memory, a riser, a tap connected to the riser tapping point, a circulation line and a first circulation pump, wherein a first end of the riser is connected to the memory, wherein a first end of the circulation line in the flow direction behind the stub line is connected to a second end of the riser, wherein a second end of the circulation line is connected to an inlet side of the first circulation pump and wherein an outlet side of the first circulation pump is connected to the memory.
  • the circulation line is connected to a circulation pump, which is arranged in the return shortly before the supply of the circulation line in the memory and which ensures that even if no hot water is taken at the tap, the water is circulated through the riser and circulation line ,
  • a circulating system is not only required for reasons of comfort. Rather, the Legionella causes a high health risk to the user.
  • the Legionella as pathogens of Legionnaires disease multiply very quickly at temperatures between 30 ° C and 45 ° C and are particularly dangerous if they are inhaled in water vapor.
  • All hot water systems, in which water droplets are finely distributed in the air, for example via a shower head, should therefore have a temperature of not less than 55 ° C in all areas of the piping.
  • a circulating system for domestic hot water of the type mentioned has a second circulation pump, wherein an inlet side and an outlet side of the second circulation pump between the first end of the riser and the stub are so connected to the riser, the second circulation pump delivers water in the direction of the stub line in an operation of the circulating system, and a bridging section of the riser bridges the second circulating pump in such a way that the bridging section of the riser and the second circulating pump are connected in parallel.
  • the circulating system initially consists of those components as they are found in circulating systems for domestic hot water from the prior art.
  • the storage is used to store already heated domestic hot water and is typically with the cold water inlet, i. the house connection for drinking water, connected.
  • a heater is also provided, which heats the water stored in the memory.
  • Such a heater may, for example, be connected to a heat generator of the prior art, e.g. a gas boiler, connected heat exchanger inside or outside the storage.
  • the memory is depressurized.
  • the warm water from the reservoir is supplied via at least one riser, but in particular a plurality of risers, which are parallel to one another, can be provided to a tapping point. It is understood that in typical embodiments of the riser a plurality of stubs and connected to the stubs tap points go off.
  • a first end of the riser is connected to the memory.
  • the riser ends with a second end directly to the last stub or behind it. There, the second end of the riser is connected to a first end of the circulation line.
  • a second end of the circulation pipe is connected to an inlet pipe of the first circulation pump, and an outlet side of the first circulation pump is in turn connected to the tank. In this way, a circulation or circulation circuit is provided, through which the domestic hot water is circulated continuously or intermittently.
  • the first circulating pump arranged as is typical of prior art domestic hot water circulating systems is located in the return of the circulating system, i. in the region of the inlet of the circulation line in the memory provided.
  • a second supply-side circulation pump This serves to move the pressure zero point of the circulating system from any location within the circulating system to a location near the first circulation pump or preferably into the first circulation pump itself.
  • the inlet side and the outlet side of the second circulation pump between the first end of the riser and the stub in one embodiment with a plurality of stubs and taps, in particular in front of the first stub, so connected to the riser that the second circulation pump in an operation of the circulating water promotes water in the direction of the stub.
  • this connection can be made directly via a pipeline or indirectly via a further circulation pump, in particular via a third and / or fourth circulation pump.
  • the second circulation pump Since the delivery rate of the second circulation pump is significantly lower than the volume flow that occurs through the riser, if consumers remove hot water at one or more taps, it is essential for the circulating system according to the invention that the second circulation pump is not involved in the riser, but Rather, it is connected to it in such a way that the riser and the second circulation pump are connected in parallel that a bridging section of the riser promotes the required volume flow when hot water is withdrawn at a tapping point.
  • a return flow stop is arranged in the bridging section of the riser, which is arranged to provide backflow of water through the riser towards the first end prevents the riser.
  • a non-return valve closes the flow cross-section of the bridging section upon a flow reversal, i. upon insertion of a flow through the bridging section towards the first end of the circulation conduit.
  • a third circulation pump is additionally provided, wherein an inlet side of the third circulation pump is connected to the outlet side of the second circulation pump, and an outlet side of the third circulation pump is connected to the riser, so that the second circulation pump and the third circulation pump are connected in series are.
  • Such a series connection of the second and third circulation pumps increases the pressure provided on the supply side, namely when the second and the third circulation pump are switched on, i. are effective.
  • the arrangement of three circulation pumps on the supply side is preferred. There then the second circulation pump, a third and a fourth circulation pump is arranged.
  • a bypass line which can be switched by at least one electrically controllable valve, is provided for bypassing the third circulation pump, so that the third circulation pump can be connected or disconnected. It is understood that in embodiments in which more than two supply-side circulation pumps are provided, preferably all the circulation pumps except for the second circulation pump each have a switchable
  • the bypass line branches off before the inlet of the third circulation pump and is guided past the circulation pump to the main conveyor line.
  • a controllable electrical valve is provided upstream of the third circulation pump and in the bypass line. While closing the third circulation pump, the valve in the bypass line is closed, the inlet side valve is opened before the third circulation pump. Conversely, a procedure is taken when the third circulation pump is taken out of service.
  • a bypass line for thermal disinfection is provided, which is arranged such that it bridges an electrically controllable valve in front of the third circulation pump, wherein the bypass line has a higher flow resistance than the bypass line for bridging the third circulation pump.
  • the circulation system further comprises a controller and at least one measuring device, wherein the controller is operatively connected to the second circulation pump and / or the third circulation pump and to the measuring device, wherein the measuring device is set up and arranged such that it is in an operation of the circulation system detects a measure of a temperature difference between a temperature of the water at the first end of the riser and a temperature of the water at the outlet side of the first circulation pump.
  • the measuring device is used to detect a temperature difference between flow and return. This is important as mentioned above, in order to obtain a measure of whether the circulating system is adequately traversed with heated water or not to prevent microbial contamination.
  • the controller is arranged such that when the temperature difference exceeds a predetermined threshold in the operation of the circulation system, it switches on the second circulation pump and / or the third circulation pump. It has been shown to be one Preventing germination is not always necessary to work with the full pumping capacity, ie with all the circulation pumps on the supply side at the same time. Rather, these can be switched on in a cascade, as soon as the circulation of the water is no longer sufficiently fast, so that the water cools down too much before it passes through the circulation line back into the memory.
  • the controller is also effectively connected to the electrically controllable valve to this also to switch.
  • the measuring device comprises a first temperature sensor and a second temperature sensor, wherein the first temperature sensor in the riser, preferably in the flow direction before the second circulation pump is arranged, and wherein the second temperature sensor in the circulation line, preferably at the second end of the circulation line, is arranged.
  • a return bypass line is connected to the second end of the circulation line and to the reservoir so as to bypass the first circulation pump, the return bypass line having a greater flow resistance than the first circulation pump.
  • the return bypass line is used in particular to compensate for volume flow differences between the circulation pumps in the return and in the flow of the circulating system.
  • a reflux barrier is arranged in the return bypass line, which is arranged such that it prevents a backflow of water through the return bypass line in the direction of the riser.
  • an overflow connection is provided with an overflow valve which connects the inlet side of the second circulation pump with the outlet side of the supply side circulation pumps.
  • This overflow connection serves to prevent the output pressure of the forward-side circulation pump from exceeding the allowable pressure in the circulating system outside the pumps.
  • the circulation system additionally comprises a heater, for example an electric heater, for heating the water flowing in the riser in the direction of the stub, outside the accumulator.
  • This auxiliary heater can additionally serve to reduce the temperature difference between supply and return, if this should be indicated once.
  • a length of a connecting tube between the second and the third circulation pump is selected such that substantially laminar flow properties are established in a volume flow emerging from the second circulation pump before the volume flow enters the third circulation pump. In this way, the effectiveness of the third circulation pump and its service life is increased. It is understood that in embodiments with more than three circulation pumps, the distances between the third and the fourth and the fourth and each further circulation pump are chosen sufficiently large.
  • At least one of the circulation pumps comprises at least two pumps connected in parallel. This in order to increase the volume flow, which is promoted by the respective circulation pump.
  • circulation pump in the parlance of the present application is used as a substitute term for a plurality of pumps connected in parallel.
  • the water-carrying material of the tubes is at least partially stainless steel and preferably the water-carrying material of the circulation pump is bronze.
  • FIG. 1 shows an inventive realization of a circulating system 1 with a minimum number of elements.
  • a water storage tank 2 serves to supply domestic hot water to a building.
  • the memory 2 is connected to the fresh water connection 14 of the building.
  • the memory 2 is next to the storage of hot water in the illustrated embodiment, the heating of the fresh water to the hot water temperature, which is to be made available to users.
  • the memory 2 has a heater (not shown in the figures).
  • the hot water is now fed via a riser 4 the individual taps 6.
  • the riser 4 is connected at its first end 3 to the memory 2.
  • the individual taps 6 are in turn connected via stubs 5 with the riser 4.
  • stubs 5 For reasons of simplicity, only two branch lines 5, each with one tap 6, are shown in all figures. It is understood, however, that in addition to a plurality of risers 4, a plurality of branch lines 5, each with one or more taps 6 may be provided.
  • a second end 10 of the riser 4 is connected to a first end 9 of a circulation line 7.
  • the circulation line 7 serves to guide the water from the riser 4 back into the memory 2 and to provide a closed circuit, which ensures that water is always present at the stubs 5 with a sufficiently high water temperature.
  • the circulation line 7 can be dimensioned significantly smaller than the riser 4. Since the amount of water that must be circulated to keep the temperature in all sections sufficiently high, is significantly less than the amount of water that must be provided to one for the Users to ensure sufficient flow at the taps 6.
  • a first circulating pump 8 is in the return, i.e., in the return flow. in the circulation line 7, provided.
  • a second end 11 of the circulation line 7 is connected to the first circulation pump 8 and the circulation pump 8 conveys the water from the circulation line 7 back into the storage 2.
  • the first circulation pump 8 is additionally bridged with a return bypass line 16, which has a higher flow resistance than the first circulation pump 8 itself.
  • a return bypass line 16 In the return bypass line 16 there is also arranged a non-return valve 15, which is set up in such a way prevents backflow of water through the return bypass line 16 in the direction of the riser 4.
  • the return bypass line 16 prevents damage to the first circulation pump 8 in the event of sudden pressure fluctuations and compensates for volume flow differences between the circulation pumps in the return line and in the supply line.
  • the first circulation pump 8 is also referred to as a return-side circulation pump, since it is arranged in the return of the pipe system formed by riser 4 and circulation line 7.
  • a forward-side second circulation pump 12 is now provided in addition to the return-side circulation pump 8. This serves to shift the pressure zero point of the circulating system 1 in the direction of the first circulation pump 8, but preferably to move it into the first circulation pump 8 itself.
  • the second circulation pump 12 is arranged parallel to a bridging section 17 of the riser 4. This is necessary because the required for a hot water removal at one of the taps 6 volume flow can not flow through the circulation pump 12.
  • the circulation pump 12 typically has too high a flow resistance for this and would be damaged by the overflow with a large volume flow.
  • a reflux barrier 18 is arranged in the bridging section 17, which prevents a backflow of water in the direction of the first end 3 of the riser 4.
  • the circulating system 1 serves to keep the temperature of the water in the riser 4 at any time sufficiently high to be able to remove water with the appropriate temperature at one of the taps 6.
  • a sufficiently high temperature of the water in the riser 4 and the circulation pipe 7 also prevents Legionella growth. Therefore, for example, it is necessary to ensure a temperature difference between flow and return of a maximum of 5 K at a flow temperature of 55 ° C.
  • the circulation system 1 off FIG. 1 therefore, it has two temperature sensors 19, 20.
  • the first temperature sensor 19 is arranged between the first end 3 of the riser 4 and the second circulation pump 12 and measures the temperature of emerging from the memory 2 hot water in the flow of the system 1.
  • the second temperature sensor 20th In contrast, in the return of the system 1 between the first circulation pump 8 and the memory 2 and thus in the region of the second end 11 of the circulation line 7 is arranged.
  • the second temperature sensor 20 thus detects the return temperature.
  • the temperature difference between the first temperature sensor 19 and the second temperature sensor 20 is sufficiently small, in the present case less than 5 K, it is sufficient if the first circulation pump 8 circulates the water in the circulating system 1. If, on the other hand, the temperature difference between the two sensors 19, 20 exceeds the aforementioned 5 K, this is a measure of the fact that the water requires too long on its way through the riser 4 and the circulation line 7 and thereby cools down too much. It is then necessary to switch on the second circulation pump 12 on the supply side.
  • a controller 21 which on the one hand evaluates the temperature signals from the temperature sensors 19, 20, however, is connected to the other effective both with the second circulation pump 12 and a valve V1 to the second circulation pump 12 either on or off to can.
  • the valve V1 serves to completely remove the second circulation pump 12 from the system 1 when it is not needed and to prevent overflow of the pump 12.
  • FIG. 2 and 3 show expansion stages of the circulating system 1 according to the invention FIG. 1 , It is assumed in these expansion stages that the second circulation pump 12 is running continuously, while another, third circulation pump 13 and / or a fourth circulation pump 22 are switched on when needed. It is understood that the other circulation pumps 13, 22 are also arranged upstream side and then, when they are switched in addition to the second circulation pump 12, are connected in series to this.
  • the third circulation pump 13 being switched on when the first threshold value is exceeded, and additionally the fourth circulation pump 22 being switched on when a second threshold value is exceeded.
  • FIG. 2 additionally shows still two optional features of the present invention, which in the embodiment of FIG. 3 have been omitted for the sake of clarity.
  • the circulating system 1 FIG. 2 a bypass line 23 for thermal disinfection of the third circulation pump 13 and its lines.
  • the bypass line 23 is arranged so that it bridges the valve V1, but with a significantly higher flow resistance than the line which connects the second circulation pump 12 via the valve V2 with the riser 4 when the valve V1 is closed.
  • This bypass line 23 always flows a certain amount of heated water through the third circulation pump 13 and their piping. In this way, a germination of the third pump 13 can be effectively prevented, even if it is not turned on once for a long time, since the temperature difference does not exceed a predetermined threshold.
  • the circulation system has 1 off FIG. 2
  • This overflow connection bridges the inlet side of the second circulation pump 12 and the outlet side of the first and second circulation pumps 12, 13.
  • the overflow connection serves to prevent the application of water pressures which exceed the system pressure.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
EP18159504.2A 2017-03-09 2018-03-01 Installation de circulation Withdrawn EP3372904A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017104947.9A DE102017104947A1 (de) 2017-03-09 2017-03-09 Umwälzanlage

Publications (1)

Publication Number Publication Date
EP3372904A1 true EP3372904A1 (fr) 2018-09-12

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EP18159504.2A Withdrawn EP3372904A1 (fr) 2017-03-09 2018-03-01 Installation de circulation

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544207B1 (fr) * 1991-11-26 1995-10-18 Klaus Wirnshofer Système de distribution d'eau
DE20217305U1 (de) * 2002-11-09 2003-03-27 Dms Wasser Waermetechnik Gmbh Desinfektion des gesamten Zirkulations-Volumenstromes
DE102004033307A1 (de) * 2003-09-05 2005-03-31 Bernhard Miller Verfahren zum Betrieb einer zentralen Warmwasserversorgungsanlage in Gebäuden
DE102013012248A1 (de) * 2013-07-24 2015-03-26 Bernhard Miller Vorrichtung und Verfahren zur Verbesserung der häuslichen Wasserqualität
EP2902714A1 (fr) * 2012-09-28 2015-08-05 Mitsubishi Electric Corporation Système d'alimentation en eau chaude

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4206078A1 (de) 1992-02-27 1993-09-02 Friedrich Mueller Vorrichtung zur energiesparenden warmwasserversorgung
DE102012025058A1 (de) 2012-12-21 2014-06-26 Bernhard Miller Vorrichtung und Verfahren zur Verbesserung der häuslichen Wasserqualität

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544207B1 (fr) * 1991-11-26 1995-10-18 Klaus Wirnshofer Système de distribution d'eau
DE20217305U1 (de) * 2002-11-09 2003-03-27 Dms Wasser Waermetechnik Gmbh Desinfektion des gesamten Zirkulations-Volumenstromes
DE102004033307A1 (de) * 2003-09-05 2005-03-31 Bernhard Miller Verfahren zum Betrieb einer zentralen Warmwasserversorgungsanlage in Gebäuden
EP2902714A1 (fr) * 2012-09-28 2015-08-05 Mitsubishi Electric Corporation Système d'alimentation en eau chaude
DE102013012248A1 (de) * 2013-07-24 2015-03-26 Bernhard Miller Vorrichtung und Verfahren zur Verbesserung der häuslichen Wasserqualität

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