EP0393010A2 - Dispositif pour un débit de fluide à température contrôlée et pour prévenir la circulation causée par l'effet thermique dans des colonnes de fluide stationnaires et stratifiées en température - Google Patents

Dispositif pour un débit de fluide à température contrôlée et pour prévenir la circulation causée par l'effet thermique dans des colonnes de fluide stationnaires et stratifiées en température Download PDF

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Publication number
EP0393010A2
EP0393010A2 EP90890074A EP90890074A EP0393010A2 EP 0393010 A2 EP0393010 A2 EP 0393010A2 EP 90890074 A EP90890074 A EP 90890074A EP 90890074 A EP90890074 A EP 90890074A EP 0393010 A2 EP0393010 A2 EP 0393010A2
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EP
European Patent Office
Prior art keywords
arrangement according
temperature
liquid
removal
preventing
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Withdrawn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
EP90890074A
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German (de)
English (en)
Other versions
EP0393010A3 (fr
Inventor
Walter Dipl.-Ing. Pennerstorfer
Manfed Tryner
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.)
Austria Email-EHT AG
Original Assignee
Austria Email-EHT AG
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 Austria Email-EHT AG filed Critical Austria Email-EHT AG
Publication of EP0393010A2 publication Critical patent/EP0393010A2/fr
Publication of EP0393010A3 publication Critical patent/EP0393010A3/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the invention relates to an arrangement for a temperature-controlled flow of liquids and to prevent a thermally induced circulation flow in stationary, temperature-stratified liquid columns, in particular in hot water supply systems with storage tanks, preferably water heaters, these water heaters being filled with liquid at a temperature above the ambient temperature.
  • Hot water supply systems are built as required as central and decentralized systems, either as pressure-resistant or pressure-free lawsuits. In all these complaints, the cold water inflow is located at the lowest point of the tank and the hot water outlet is at the highest point if possible. Depending on the state of charge of the water heater, there is always a cold water zone and a transition zone of medium temperature, the so-called mixed water zone, in the lower area, and above that the hot water zone with the desired hot water temperature.
  • Legionella is a gram-negative, flagellated bacteria that can trigger the so-called "legionellosis” - a severe form of bacterial pneumonia with an incubation period of two to ten days.
  • water which may be contaminated with microorganisms, flows from the mixed water zone and, if applicable, also from the cold water zone into the pipe system to the individual tapping points.
  • This sinking of the cooled hot water not only lowers the temperature of the hot water in the water heater until it is reheated, it also increases the volume of the mixed water zone. This also increases the area that offers microorganisms a good opportunity for development.
  • the object of the invention is therefore to provide an arrangement with which it is prevented that water contaminated with microorganisms can be removed at the removal points of hot water supply systems.
  • the object is achieved by the invention.
  • This is characterized in that at least one device is provided in the area of the removal point, which device both the reflux of the heated liquid from the removal line into the storage container and the removal of the prevents heated stored liquid below a certain temperature.
  • the arrangement according to the invention ensures that hot water only flows from the water heater into a hot water extraction line when the water temperature is above a certain value. This prevents live microorganisms, especially the dangerous Legionella, from being fed to the hot water tapping points.
  • the device preventing the backflow of the liquid is an automatic shut-off device free of auxiliary energy, and the device preventing the removal of the liquid below a certain temperature is a closed-loop control device.
  • shut-off device preventing the backflow of the liquid is a weight-loaded or a spring-loaded valve.
  • a special feature of the invention is that the device preventing the backflow of the liquid is a correspondingly shaped, preferably P- or S-shaped, or formed according to a labyrinth pipe bend.
  • control element preventing the removal of the liquid below a certain temperature is a bimetallic valve.
  • control device is to be operated without external energy.
  • control element preventing the removal of the liquid below a certain temperature is a thermohydraulically actuated valve or a gas-actuated thermopneumatic valve.
  • This control element makes use of the thermal liquid expansion or the thermal gas expansion and is advantageous because of its robustness and accuracy.
  • a special development of the invention is that a safety combination is provided in a common housing, which on the one hand prevents the backflow and on the other hand the removal of liquid below a certain temperature.
  • Such a safety combination has the advantage of taking up little space and being easy to install.
  • the safety combinations are equipped with spring reinforcement.
  • a further development according to the invention consists in that at least one of these organs can be actuated electromagnetically or hydraulically or pneumatically or mechanically by means of auxiliary energy.
  • these devices are arranged in an insulated housing.
  • a special feature of the invention is that the device preventing the removal of liquid below a certain temperature is a control element in the cold water inlet of the water heater, which can be controlled by a temperature sensor arranged at a hot water extraction point.
  • This feature enables the controller to be precisely set to the hot water temperature directly at the point of use and to take into account and fully protect special designs of water heaters and hot water supply systems that do not have a shut-off device in the hot water supply line.
  • control element arranged in the cold water inlet is operated thermo-hydraulically or gas-operated without auxiliary energy.
  • the control element is actuated hydraulically as a result of thermal liquid expansion or gas operated due to thermal gas expansion.
  • This regulator has the advantage of being robust and precise.
  • control element arranged in the cold water inlet can be actuated electromagnetically, hydraulically, mechanically or pneumatically with auxiliary energy.
  • FIG. 1 and FIG. 2 show a sectional view of a safety combination of the shut-off and control element, in a compact or simple design.
  • Fig. 3 illustrates the application of the invention in a hot water supply system.
  • Fig. 1 shows an embodiment in the form of a compact safety combination (1).
  • a tubular housing (2) is offset on the inside in such a way that a spacer (3) with the side facing the water heater rests firmly.
  • the spacer body (3) is fixed on the side facing the removal point by means of a screw-in nipple (4).
  • the seal between the screw-in nipple (4) and the housing (2) - which is covered with thermal insulation (5) - is provided by a sealing ring (6).
  • a temperature-dependent control element (7) and a non-return valve (8) are arranged between the tubular housing (2) and the spacer body (3) or the screw-in nipple (4).
  • An arrow (9) indicates the direction of flow of the water.
  • Fig. 2 shows a simpler version of a safety combination (16).
  • a temperature-dependent control element (14) and a non-return valve (15) are arranged here in a pipe (11) covered with heat insulation (10) by means of spacers (12) and circlips (13).
  • a thermostatic cylinder arranged concentrically inside the temperature-dependent control element (7, 14) expands when it comes into contact with hot water, as a result of which the valve cone lifts off the valve seat and opens the flow path.
  • the hot water flows out of the water heater if at least one hot water tapping point is open. This is done by pressing the hot water against the valve body so that the spring force is overcome and can therefore flow through the valve seat.
  • FIG 3 shows the basic structure of a high-pressure hot water supply system with a built-in arrangement according to the invention.
  • a cold water line (17) feeds a standing water heater (21) via a shut-off valve (18), a non-shut-off check valve (19) and a spring-loaded safety valve (20).
  • the water heater (21) is heated by a heating register (22) arranged in the lower region.
  • a hot water pipe (23) connected in the upper area of the water heater (21) leads via a safety combination (24) to the hot water tapping points.
  • the temperature-dependent control element and the reflux shut-off element can also be designed differently.
  • the temperature-dependent control element can also be a bimetal-operated, a thermohydraulically-operated or a gas-operated valve.
  • Temperature-dependent control elements such as, for example, electromagnetically, hydraulically, pneumatically or mechanically driven valves, can also be used by means of auxiliary energy.
  • the check valve can also be operated, for example, under weight, or can also be driven by means of auxiliary energy.
  • appropriate sensors can also be arranged.
  • a further embodiment of the invention consists in a reflux shut-off element arranged in the hot water outlet and temperature-dependent control element arranged in the cold water inlet, in which Embodiment a sensor must be arranged in the hot water outlet for actuating the control element.
  • a P-shaped or S-shaped pipe bend can also be used to prevent the thermosiphon effect instead of a non-return valve.
EP19900890074 1989-03-13 1990-03-13 Dispositif pour un débit de fluide à température contrôlée et pour prévenir la circulation causée par l'effet thermique dans des colonnes de fluide stationnaires et stratifiées en température Withdrawn EP0393010A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT576/89 1989-03-13
AT0057689A AT399577B (de) 1989-03-13 1989-03-13 Anordnung für einen temperaturkontrollierten durchfluss von flüssigkeiten und zur unterbindung einer zirkulationsströmung in warmwasser-versorgungssystemen

Publications (2)

Publication Number Publication Date
EP0393010A2 true EP0393010A2 (fr) 1990-10-17
EP0393010A3 EP0393010A3 (fr) 1991-05-22

Family

ID=3494237

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900890074 Withdrawn EP0393010A3 (fr) 1989-03-13 1990-03-13 Dispositif pour un débit de fluide à température contrôlée et pour prévenir la circulation causée par l'effet thermique dans des colonnes de fluide stationnaires et stratifiées en température

Country Status (2)

Country Link
EP (1) EP0393010A3 (fr)
AT (1) AT399577B (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3144904A (en) * 1962-05-04 1964-08-18 Kahn Frank Heat trap for storage water heaters
JPS59164841A (ja) * 1983-03-09 1984-09-18 Hitachi Ltd 瞬間式給湯機
EP0186515A2 (fr) * 1984-12-24 1986-07-02 A.O. Smith Corporation Cuve d'eau chaude avec pertes de chaleur réduites

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4305547A (en) * 1978-12-08 1981-12-15 Aerco International, Inc. Water heater temperature control system
DE2947995A1 (de) * 1979-11-28 1981-07-23 Vama Vertrieb Von Anlagen Und Maschinen Gmbh & Co Kg, 3200 Hildesheim Heizwasserspeicher
DE3641726A1 (de) * 1986-12-06 1988-06-09 Viessmann Werke Kg Verfahren zur verhinderung des erhaltes und der vermehrung von schaedlichen keimen eines in einem aufheizbaren system befindlichen brauchwasservolumens und einrichtungen zu deren durchfuehrung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3144904A (en) * 1962-05-04 1964-08-18 Kahn Frank Heat trap for storage water heaters
JPS59164841A (ja) * 1983-03-09 1984-09-18 Hitachi Ltd 瞬間式給湯機
EP0186515A2 (fr) * 1984-12-24 1986-07-02 A.O. Smith Corporation Cuve d'eau chaude avec pertes de chaleur réduites

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 18 (M-353)(1741) 18 September 1984 & JP-A-59 164 841 (HITACHI SEISAKUSHO K.K. ) 9. März 1983 *

Also Published As

Publication number Publication date
EP0393010A3 (fr) 1991-05-22
ATA57689A (de) 1994-10-15
AT399577B (de) 1995-06-26

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