WO2019162243A1 - Réduction de valeur d'enclenchement en fonction de la valeur de consigne - Google Patents

Réduction de valeur d'enclenchement en fonction de la valeur de consigne Download PDF

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Publication number
WO2019162243A1
WO2019162243A1 PCT/EP2019/054022 EP2019054022W WO2019162243A1 WO 2019162243 A1 WO2019162243 A1 WO 2019162243A1 EP 2019054022 W EP2019054022 W EP 2019054022W WO 2019162243 A1 WO2019162243 A1 WO 2019162243A1
Authority
WO
WIPO (PCT)
Prior art keywords
water heater
control device
flow
temperature
switch
Prior art date
Application number
PCT/EP2019/054022
Other languages
German (de)
English (en)
Inventor
Michael Grobe
Original Assignee
Stiebel Eltron Gmbh & Co.Kg
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 Stiebel Eltron Gmbh & Co.Kg filed Critical Stiebel Eltron Gmbh & Co.Kg
Publication of WO2019162243A1 publication Critical patent/WO2019162243A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2028—Continuous-flow heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/238—Flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/281—Input from user
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/37—Control of heat-generating means in heaters of electric heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/395—Information to users, e.g. alarms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F24H15/45—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based remotely accessible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/407—Control of fluid heaters characterised by the type of controllers using electrical switching, e.g. TRIAC

Definitions

  • the present invention relates to a method for operating a water heater and a water heater.
  • a water heater is used for heating water, which feeds a tapping point with warm water.
  • a water heater In larger facilities, such as an airport, often several consumers respectively taps are arranged side by side, each of which is powered by its own water heater.
  • the supply of water is carried out by means of a common supply line from which is branched off to the water heater.
  • the instantaneous water heater is controlled as a function of a predetermined switch-on threshold, which corresponds to a minimum volume flow. Only when a minimum volume flow is detected, the water is heated by means of a heating section of the water heater. This serves to avoid damage to the heating section, if it can come to an evaporation of a heating element of the heating due to the low flow rate. Too low a volumetric flow occurs, for example, when a plurality of consumers, which depend on a common supply line, are open at the same time, so that the respective instantaneous water heater is supplied with a volumetric flow lying below the switch-on threshold value. This circumstance is countered by manually lowering the switch-on threshold. However, this involves the risk that the switch-on threshold causes a control of the water heater, although the volume flow is not sufficiently large to avoid gas bubble formation in the heating section.
  • the present invention is therefore based on the object to provide a method for operating a water heater and a water heater, whereby a safe operation of the water heater is ensured even at low flow rates.
  • This object is achieved by a method for operating a water heater and a water heater.
  • a method for operating a water heater comprising controlling a Einschaltschwelliness for a flow rate through the water heater based on a setpoint temperature.
  • the switch-on threshold value as a function of the setpoint temperature, it is possible to prevent a flow rate which is too low for a preset setpoint temperature, at which the flow heater nevertheless starts to heat, from damaging the flow heater by, for example, gas bubble formation in the heating section.
  • a change in the setpoint temperature is accompanied by a change in the switch-on threshold due to the proposed control.
  • the switch-on threshold value is lowered at the same time. As a result, an operation can be realized even with only low volume flows without the risk of gas bubble formation.
  • a power stage for operating a heating section of the water heater can be selected based on the setpoint temperature.
  • the adaptation of the switch-on threshold to lower volume flows may be accompanied by an adjustment of the power control, whereby the heating section is exposed to a lower load and power consumption when heating the water.
  • a triggering of at least one heating element of a heating section having a plurality of heating elements can be carried out.
  • the heating section of the water heater may comprise at least two, preferably four heating elements, which are individually or in pairs controllable.
  • two heating elements of the total volume flow can be supplied, while the other two heating elements only a proportionate volume flow is supplied in each case.
  • the control of the heating elements can be selected so that first the heating elements are controlled, where the total volume flow is supplied, while the other two heating elements are driven at a later time. This can be the case, for example, with an increase in the volume flow and / or a higher setpoint temperature.
  • the setpoint temperature can be set variably by means of a setting device. This allows a user to specify a setpoint temperature that will initially govern the operation of the water heater.
  • a request for adjusting the setpoint temperature can be signaled when falling below the Einschaltschwellives. This allows the user to adapt the switch-on threshold to prevailing operating conditions if, for example due to frequent parallel control of several consumers, a connection of a water heater is regularly supplied with a volume flow which is below the switch-on threshold.
  • At least one characteristic curve for the switch-on threshold value can be stored in a control device for operating the instantaneous water heater.
  • the storage of at least one characteristic in the control device allows adaptation to different operating situations.
  • the invention relates in a further aspect to a water heater.
  • a continuous flow heater having at least one heating section, a control device, a flow sensor and a temperature sensor, characterized in that the control device is set up to control a switch-on threshold value for a volume flow through the instantaneous water heater based on a setpoint temperature. If the detected volume flow is below the switch-on threshold, activation of the flow heater is prevented. By changing the setpoint temperature, the switch-on threshold is controlled in such a way that damage to the flow heater, in particular the heating section by gas bubble formation, is avoided.
  • At least one characteristic curve for the switch-on threshold value can be stored in the control device.
  • At least one characteristic curve for the switch-on threshold value can be stored in the control device.
  • the heating section can have at least two heating elements which can be activated by the control device.
  • the control device can have at least two heating elements which can be activated by the control device.
  • an individual control of the at least two heating elements is conceivable.
  • an adjustment device can be provided for setting and changing the setpoint temperature.
  • the adjustment device allows the user to adjust the setpoint temperature in order to effect a control of the heating path, even at low flow rates, to heat the water.
  • the adjusting device can be designed as an input device such as buttons or a control panel on the water heater, which is connected by signal technology with the control device.
  • a temperature upper limit can be specified.
  • the default can be performed by means of the adjustment, which is associated with the water heater.
  • a mechanical adjustment may be provided to the water heater to specify the upper temperature limit can.
  • This may be, for example, one or more jumpers or DIP switches, which are preferably arranged on a circuit board of the control device.
  • a plurality of power stages can be stored in the control device, which can be selected as a function of the setpoint temperature for controlling the heating section.
  • the operation of the instantaneous water heater can be based on the switch-on threshold, so that a lower power level can be selected for lower volume flows than for larger volume flows. Based on the selected power level, the heating section is controlled.
  • control device may be connected to a display device.
  • the display device By means of the display device, the current setpoint temperature can be displayed to a user. Furthermore, the user can be informed by the display device that in the case of too low a volume flow adjustment of the setpoint temperature is necessary in order to adapt the switch-on threshold to the situation.
  • a corresponding input can be carried out by means of the input device.
  • the control device may comprise a communication interface. By means of the communication interface can be entered through a communication infrastructure, such as a local network or the Internet, with the control device of the water heater in communication, for example, to change settings remotely or to transfer characteristics to the control device.
  • the provision of the communication interface allows a data exchange of several, in particular in close proximity to each other, water heaters among themselves, which are operated under comparable operating conditions.
  • control device can be set up for a specification of a maximum temperature in an emergency operation. If, for example, the failure of the temperature sensor causes that the setpoint temperature can not be reached, the control device activates the heating path in accordance with a switch-on threshold value which is set as a function of the predetermined maximum temperature.
  • Fig. 1 is a schematic representation of a water heater
  • Fig. 2 is a schematic representation of the structure of a heating section of a
  • FIG. 3 shows characteristic curves of a switch-on threshold value of a water heater in dependence on a setpoint temperature
  • Fig. 4 is a diagram of a control of a water heater according to the invention.
  • Fig. 5 shows a relationship between an adjustment of a power control of a water heater due to the change of the Einschaltschwellhongs.
  • FIG. 1 shows a schematic representation of a continuous flow heater 1 comprising a heating section 2, at least one fluid flow sensor 3, at least one temperature sensor 4, a control device 5, an adjusting device 6 and a display device 7.
  • the inlets and outlets are not shown in the schematic view of water and the fluid line through the flow heater.
  • the control device 5 is signal-connected to the at least one fluid flow sensor 3 and the at least one temperature sensor 4. At least a measured values are provided to the control device 5 for evaluation, a fluid flow sensor 3 and the at least one temperature sensor 4. The control device 5 controls the heating section 2 based on these measured values.
  • the adjusting device 6 makes it possible to change operating parameters of the water heater 1. Thus, by the adjusting device 6, a setpoint temperature, ie a desired outlet temperature of the heated water, adjustable or changeable.
  • FIG. 2 shows a schematic representation of the structure of a heating section 2 of a water heater 1.
  • a heating section 2 of a water heater 1.
  • water for example, a line connection
  • the heating section 2 Through an outlet 9, the heated water exits for use.
  • the water passes through the fluid flow sensor 3, which detects the entering volume flow.
  • the fluid flow sensor 3 can be designed as a combined temperature and volume flow sensor, which at the same time detects the water temperature in the inlet 8 of the heating section 2.
  • the water is passed through the heating section 2 along a flow path 10.
  • the flow path 10 comprises a plurality of flow channel sections 1 1, 12, 13, in which heating elements 14, 15, 16 are arranged.
  • a first flow channel section 1 1 is provided, in which a first heating element 14 is located.
  • a second flow channel section 12 connects.
  • the second flow channel section 12 has two parallel strands 12a, 12b, which divide the volume flow into two partial volume flows.
  • a second heating element 15 is arranged in each case.
  • the second flow channel section 12 is adjoined by a third flow channel section 14, in which the two partial volume flows are brought together again.
  • a third heating element 16 is arranged in the third flow channel section 14.
  • the third heating element 16 is followed by the temperature sensor 4, which detects the temperature of the liquid flowing at this point.
  • the heating elements 14, 15, 16 of the heating section 2 are designed as heating resistors and are each driven by a power electronic switching element 17.
  • the power electronic switching elements 17 may be formed, for example, as triacs or thyristors.
  • the power electronic switching elements 17 are cooled, for example, by the water before passing through the heating section 2.
  • the control of the heating section 2 is based on the volume flow supplied to it, which must pass a switch-on threshold, ie a minimum volume flow. Setting the switch-on threshold prevents the water from reaching the Heating elements 14, 15, 16 is heated so that it starts to boil, causing blistering. The occurrence of bubbles in the water within the heating section 2 can lead to overheating of the heating elements 14, 15, 16 until their destruction.
  • first of all the activation of the first and third heating elements 14, 16 in the first and third flow channel sections 11, 13 can take place, through which the total volume flow flows.
  • the activation of the second heating elements 15 in the strands 12a, 12b of the second flow channel section 12 can take place at a later time depending on the detected volume flow or a set higher setpoint temperature.
  • the regulation of Einschaltschwellhongs for a flow rate through the water heater 1 is provided based on the setpoint temperature.
  • the switch-on threshold value is controlled as a function of the setpoint temperature, it is avoided that a flow rate that is too low for a specific setpoint temperature leads to damage to the flow heater 1 due to the formation of bubbles.
  • various courses of the switch-on threshold value are stored in the control device 5.
  • FIG. 3 shows various exemplary characteristic curves 18, 19, 20 of FIG.
  • Switch-on threshold value of the instantaneous water heater 1 as a function of the setpoint temperature In addition to a linear curve 18, an exponential and a logarithmic curve 19, 20 are shown. The selection of a specific characteristic can be done depending on the operating situation.
  • FIG. 4 illustrates the control according to the invention. 4 shows a curve 21 of the switch-on threshold value as a function of the setpoint temperature. As the setpoint temperature increases, the switch-on threshold for the required volume flow increases.
  • Fig. 5 the relationship between an adjustment of a power control due to the change of the Einschaltschwellhongs is shown.
  • the lowering of a first switch-on threshold value 23A, for which a first volume flow 22A is required, to a lower second switch-on threshold value 23B results in a lower second volume flow 22B being required for controlling the instantaneous heater 1.
  • the Power control is adjusted by lowering from a higher first power level 24A to a lower second power level 24B.
  • FIG. 6 shows by way of example a power adaptation in the given volume flow 22A by a change of the switch-on threshold value 23A on the basis of a curve 25 of the power received by the heating section 2.
  • the volume flow 22A is below the first switch-on threshold value 23A, so that the heating section 2 of the instantaneous water heater 1 is not activated, so that no power is absorbed by the heating section 2.
  • the lowering to the lower second switch-on threshold value 23B results in that the heating zone 2 is activated in order to operate the heating elements 14, 15, and / or 16 in accordance with a power stage 24B adapted to the second switch-on threshold value 23B.
  • the setpoint temperature is reduced by means of the adjusting device 6, which is accompanied by a reduction of the switch-on threshold value.
  • This thus allows the control of the water heater 1 even at low flow rates, without causing damage to the heating section 2.
  • the operation of the water heater 1 in different power levels 24A, 24B in dependence on the respective switch-on threshold value 23A, 23B also contributes to a reduction of the stress on the heating section 2 or the heating elements 14, 15, 16.
  • the control device 5 can be equipped with a communication interface which makes it possible to communicate with other instantaneous water heaters by means of a communication infrastructure, for example WiFi or Internet. This is particularly conceivable for spatially adjacent fürlauferhitzter operated under similar conditions. In this way, a setting of the setpoint temperature made on a water heater could be transferred to other instantaneous water heaters. The same applies when progressions for switch-on threshold values are transmitted to the control device 5 of the instantaneous water heater 1.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Computer Hardware Design (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

La présente invention concerne un procédé pour faire fonctionner un chauffe-eau instantané, comprenant une régulation d'une valeur seuil d'enclenchement pour un débit volumétrique à travers le chauffe-eau instantané, sur la base d'une température de consigne.
PCT/EP2019/054022 2018-02-20 2019-02-19 Réduction de valeur d'enclenchement en fonction de la valeur de consigne WO2019162243A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018001315.5 2018-02-20
DE102018001315.5A DE102018001315B4 (de) 2018-02-20 2018-02-20 Einschaltwertreduzierung in Abhängigkeit vom Sollwert

Publications (1)

Publication Number Publication Date
WO2019162243A1 true WO2019162243A1 (fr) 2019-08-29

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ID=65516594

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Application Number Title Priority Date Filing Date
PCT/EP2019/054022 WO2019162243A1 (fr) 2018-02-20 2019-02-19 Réduction de valeur d'enclenchement en fonction de la valeur de consigne

Country Status (2)

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DE (1) DE102018001315B4 (fr)
WO (1) WO2019162243A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19530000A1 (de) * 1994-09-09 1996-03-14 Stiebel Eltron Gmbh & Co Kg Warmwasserbereitungsanlage
DE19541145A1 (de) * 1994-10-31 1996-05-02 Vaillant Joh Gmbh & Co Verfahren zur Steuerung eines Volumenstrombegrenzers
DE202004010487U1 (de) * 2003-07-02 2004-09-30 Gerdes Ohg Durchlauferhitzer
DE102010031521A1 (de) * 2010-07-19 2012-01-19 BSH Bosch und Siemens Hausgeräte GmbH Elektrischer Heizblock und Durchlauferhitzer
EP2423619A2 (fr) * 2010-08-26 2012-02-29 Eichenauer Heizelemente GmbH & Co. KG Chauffe-eau instantané pour le chauffage d'un fluide et procédé de fonctionnement d'un chauffe-eau instantané

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19702904C2 (de) * 1997-01-28 1999-12-30 Stiebel Eltron Gmbh & Co Kg Überwachungsschaltung bei einem Durchlauferhitzer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19530000A1 (de) * 1994-09-09 1996-03-14 Stiebel Eltron Gmbh & Co Kg Warmwasserbereitungsanlage
DE19541145A1 (de) * 1994-10-31 1996-05-02 Vaillant Joh Gmbh & Co Verfahren zur Steuerung eines Volumenstrombegrenzers
DE202004010487U1 (de) * 2003-07-02 2004-09-30 Gerdes Ohg Durchlauferhitzer
DE102010031521A1 (de) * 2010-07-19 2012-01-19 BSH Bosch und Siemens Hausgeräte GmbH Elektrischer Heizblock und Durchlauferhitzer
EP2423619A2 (fr) * 2010-08-26 2012-02-29 Eichenauer Heizelemente GmbH & Co. KG Chauffe-eau instantané pour le chauffage d'un fluide et procédé de fonctionnement d'un chauffe-eau instantané

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DE102018001315B4 (de) 2023-12-07
DE102018001315A1 (de) 2019-08-22

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