EP1076212A2 - Méthode et dispositif de commande pour chauffe-eau électrique - Google Patents

Méthode et dispositif de commande pour chauffe-eau électrique Download PDF

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Publication number
EP1076212A2
EP1076212A2 EP00306820A EP00306820A EP1076212A2 EP 1076212 A2 EP1076212 A2 EP 1076212A2 EP 00306820 A EP00306820 A EP 00306820A EP 00306820 A EP00306820 A EP 00306820A EP 1076212 A2 EP1076212 A2 EP 1076212A2
Authority
EP
European Patent Office
Prior art keywords
heating element
temperature
control
water
set point
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Withdrawn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
EP00306820A
Other languages
German (de)
English (en)
Other versions
EP1076212A3 (fr
Inventor
Jason S. Anderson
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.)
Therm O Disc Inc
Original Assignee
Therm O Disc Inc
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 Therm O Disc Inc filed Critical Therm O Disc Inc
Publication of EP1076212A2 publication Critical patent/EP1076212A2/fr
Publication of EP1076212A3 publication Critical patent/EP1076212A3/fr
Withdrawn legal-status Critical Current

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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
    • F24H9/2021—Storage 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
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/128—Preventing overheating
    • F24H15/132—Preventing the operation of water heaters with low water levels, e.g. dry-firing
    • 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
    • F24H15/156—Reducing the quantity of energy consumed; Increasing efficiency
    • 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
    • F24H15/175—Supplying heated water with desired temperature or desired range of temperature where the difference between the measured temperature and a set temperature is kept under a predetermined value
    • 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
    • F24H15/223—Temperature of the water in the water storage tank
    • F24H15/225—Temperature of the water in the water storage tank at different heights of the tank
    • 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
    • F24H15/269—Time, e.g. hour or date
    • 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
    • F24H15/40—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
    • 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
    • F24H15/486—Control of fluid heaters characterised by the type of controllers using timers

Definitions

  • This application relates to the art of controls and methods for operating electric water heaters.
  • the invention is particularly applicable to a control and method that uses a micro controller and will be described with specific reference thereto. However, it will be appreciated that the invention has broader aspects and can be carried out with other types of controls.
  • a control and method for detecting a dry start in an electric water heater having a single or dual top and bottom electric heating elements or additional heating elements operates by first recording the initial temperature at the single or bottom most heating element.
  • the single or bottom most heating element then is activated for a short period of time followed by deactivation and a delay after which the final temperature at the bottom most heating element is recorded.
  • the initial and final temperature readings are then compared and if the difference therebetween is greater than several degrees, it indicates that the single or bottom most heating element is not submerged in water and the control locks all the heating elements off so as to prevent further energization of the heating elements until the controller is reset.
  • the difference between the initial and subsequent temperature is less than a few degrees, there is confirmation that the bottom heating element is surrounded by water and the bottom heating element is then activated for heating the water to a turn off set point temperature.
  • the temperature at the top heating element is monitored and the control enables activation of the top heating element only after the temperature at the top heating element has reached the turn off set point temperature and then falls several degrees below the turn off set point temperature. This prevents activation of the top heating element in the event the water heater tank has not been purged of air and hence the top heating element has not been submerged in water.
  • the controller may also incorporate features to enable the set point temperature (the temperature at which the heating element is deenergized) to be varied either at various times during the day and/or for different days of the week so as to accommodate hot water use patterns while reducing the overall energy consumption of the water heater as well as to provide a vacation setting during which a reduced set point is maintained over an extended period of time thus offering the consumer a convenient, easy to use means for conserving energy consumption.
  • set point temperature the temperature at which the heating element is deenergized
  • Figure 1 shows an electric water heater A that includes a water tank B having a top wall 12, a bottom wall 14 and a peripheral or side wall 16.
  • a cold water supply pipe 18 enters tank B through top wall 12 thereof and has an inlet 20 located adjacent tank bottom wall 14 so that cold water enters tank B adjacent the bottom thereof.
  • a hot water discharge pipe 22 extends into tank B through top wall 12 thereof and has an inlet 24 located adjacent top wall 12 through which hot water is discharged from tank B.
  • Top and bottom electric heating elements C, D extend into tank B through side wall 16 thereof and are secured to side wall 16 in a known manner.
  • Each heating element C, D has a base 30, 32 located externally of tank side wall 16.
  • Each base has suitable terminals thereon for connecting wires thereto and a temperature sensor such as a thermistor 35, 36 having a negative temperature coefficient of resistance is received in each base for providing temperature signals.
  • the present invenition is being described in connection with a water heater employing dual heating elements, that is upper and lower heating elements C and D. However, it may also be incorporated in water heaters utilizing only a single heating element if desired or a heater having more than two such heating elements.
  • control E is shown mounted at the top of electric water heater A although it will be appreciated that other mounting locations also are possible.
  • Control E is connectable with an AC power source in a known manner, and wires 38, 40 are shown diagrammatically for connecting heating elements C, D to the power source through control E and for connecting thermistors 34, 36 with control E.
  • the tank When a water heater is initially installed or is being returned to service after having had the water drained from the holding tank, the tank will contain a volume of air at atmospheric pressure. As the water supply valve is opened, water will flow into the tank until the internal pressure within the tank is equal to the pressure of the water supply. However, if the outlet valve is closed or if none of the hot water dispensing valves are opened, the air in the tank will be trapped and compressed to a pressure equal to that of the water supply pressure. This compressed air if not released will limit the filling of the tank with water such that one or both heating elements may be not submerged in water. Because water is a much better heat sink than air, energization of a heating element when it is not submerged in water may result in damage to the heater element. This condition is commonly referred to as a dry start condition meaning that a heating element is energized before it is submerged in water.
  • control E is turned on to initiate operation as indicated at 50.
  • Control E then records an initial temperature monitored by thermistor 36 at bottom heating element D as indicated at 52.
  • Bottom heating element D then is activated for a predetermined time period followed by deactivation for a predetermined delay time as indicated at 54.
  • control E again records a final temperature monitored by thermistor 36 at bottom heating element D as indicated at 56. The difference between the initial and final temperatures is then calculated as indicated at 58.
  • a difference greater than a predetermined number of degrees between the initial and final temperature means that there has been a dry start and that the bottom heating element is not surrounded by water. If the difference between the initial and final temperature is less than the predetermined number of degrees, it means that the bottom heating element is submerged in water and operation of the water heater may proceed in the normal manner.
  • the bottom heating element is activated as indicated at 62 for heating water in the tank to a turn off set point temperature as determined by a manually operable selector switch indicated at 64. The bottom heating element cycles or remains on until the turn off set point temperature is reached. Bottom heating element D will then be deenergized by control E.
  • control E will reenergize lower heating element which will typically be on the order of 5-10 degrees below the turn off set point temperature to again heat the water in tank B up to the turn off set point temperature. This operation cycle will then continue in this sequence for normal operation.
  • control E When the temperature sensed by thermistor 34 falls a predetermined number of degrees below the turn off set point temperature as a result of use of hot water or normal cooling of the water, control E will enable normal operation of the upper heating element. Therefore, the control will activate top heating element C only after the temperature monitored by top thermistor 34 falls a predetermined number of degrees below the set point temperature. Thereafter, both the top and bottom heating elements may cycle individually but generally not simultaneously for maintaining the set point temperature. These operational steps are indicated at 66 and 68 in Figure 2A.
  • control E will not operate to initiate the routine described above to allow for energization of the upper heating element if the turn off set point temperature is below a predetermined minimum, such as for example below 110° F.
  • control E will be designed to enable operation of one or the other of heating elements C or D but generally not both simultaneously.
  • lower element D will normally be cycled on and off in response to demand.
  • upper heating element C will be energized until such time as the turn off set point is reached.
  • other types of water heaters may allow for simultaneous operation of both heating elements or even more than two heating elements.
  • control E is equally useful with such water heaters, it being understood that the same sequence for enabling initial energization of the lower most and then the upper most heating elements by control E as described above with respect to elements C and D will be followed. It should be noted that while it is possible to design control E such that it will sequentially enable energization of each successively higher mounted heating element if desired, this is generally not believed necessary because once the top most heating element has been submerged in water, all of the other lower heating elements will also have been submerged.
  • the control operates to deenergize lower heating element D and thereafter will prevent energization of both heating elements C and D as indicated at 70.
  • the control may be reset and reactivated as indicate at 72 to do a restart from the step indicated at 50 in Figure 2.
  • control E will initially operate to energize lower heating element D for a period of about 5 seconds after the initial temperature of thermistor 36 has been recorded. Thereafter, it will operate to deenergize the lower heating element for a period of about two minutes after which the temperature sensed by lower thermistor 36 will again be recorded. If the difference between the first and second recorded temperatures is greater than 5° F., a dry start condition is indicated and further energization of both heating elements would be prevented until control E has been reset. It should be noted, however, that while the above time durations and temperatures are presently believed preferable, they may be varied depending upon the particular application for which the present inveniton is to be used. For example, if a lower wattage heating element is used, it may be desirable to increase the energization time duration and likewise higher wattage heating elements may require a shorter on time.
  • a micro controller F controls operation of upper and lower heating elements C, D in accordance with the present application.
  • the circuit includes four power transistors 82-85 connected with four relays 92-95.
  • Relays 92-94 are normally open while relay 95 is normally closed.
  • Relays 92 and 93 respectively are connected with upper and lower heating elements C, D, and relays 94, 95 are limit relays.
  • Comparators 102, 104 are provided for turning transistors 84, 85 on or off to control limit relays 94, 95.
  • a selector switch 110 is provided for selecting a desired set point temperature for the water in the water heater.
  • a transistor 112 flashes LED 114 in accordance with signals from micro controller F when fault conditions exist.
  • thermistors 34, 36 provide constant temperature signals to micro controller F which records an initial temperature at the bottom heating element from bottom thermistor 36.
  • Micro controller F then turns on transistor 83 to energize and close relay 93 for a short period of time such as around five seconds. This activates lower heating element D through relays 95, 93 and 94. Following the short time period, micro controller F turns transistor 83 off to deenergize and open relay 93 for deactivating lower heating element D.
  • micro controller F After lower heating element D is turned off, there is a delay of around two minutes at the end of which micro controller F records a final temperature from thermistor 36 at the bottom heating element. Micro controller F then compares the initial and final temperatures. If the difference is more than a predetermined number of degrees, it indicates that there has been a dry start and the lower heating element is not submerged in water. Therefore, micro controller F will lock all the heating elements off so as to prevent further operation of the heating elements. An appropriate visual and/or audible alarm may also be provided on control E to indicate this condition.
  • micro controller F will again turn transistor 83 on to close relay 93 and reactivate lower heating element D.
  • Lower heating element D will be activated until the temperature signal received by micro controller F from bottom thermistor 36 corresponds to the desired turn off set point temperature that has been selected with selector switch 110.
  • micro controller F turns transistor 83 off to open relay 93 and deactivate lower heating element D.
  • Micro controller F receives constant readouts from thermistors 34, 36 to cycle the heating elements on and off for maintaining a desired water temperature in tank B. If there is an air bubble in the top of the tank, upper heating element C will not be submerged in water and it is undesirable to activate the top heating element under such conditions. Therefore, micro controller F will not enable activation of upper heating element C until the temperature signal provided by top thermistor 34 first reaches a temperature within a first predetermined number of degrees of the turn off set point temperature and thereafter falls a second predetermined number of degrees below the turn on set point temperature. These first and second predetermined numbers of degrees will preferably be about 3-5° F. although other numbers may be used and the two need not be equal.
  • micro controller F blocks or prevents activation of the top heating element. After the temperature falls the required number of degrees, micro controller F enables activation of the top heating element when subsequent signals from the thermistors call for activation of the top heating element.
  • micro controller F may cycle bottom heating element D for bringing the water back up to the set point temperature and maintaining it.
  • micro controller F will activate only upper heating element C for reheating the water that will be drawn first from the tank.
  • micro controller F will turn transistor 82 on to energize and close relay 92. This activates upper heating element C through limit relay 95, relay 92 and relay 94.
  • micro controller F will deactivate top heating element C and may activate bottom heating element D.
  • Micro controller F is programmed to respond to excessive temperature signals from thermistors 34, 36. In the event thermistors 34,36 provide signals to micro controller F indicative of an excessive temperature, micro controller F will turn transistors 82, 93 off to open relays 92, 93 and deactivate the heating elements until such time as it is reset.
  • micro controller F does not deactivate the heating elements in response to excessive temperature signals provided by thermistors 34, 36, the excessive temperature signal from top thermistor 34 will cause the output of comparator 102 to go high which turns transistor 82 on for energizing and opening normally closed relay 95. At the same time, the output of comparator 102 going high causes the output of comparator 104 to go low which turns transistor 84 off and opens relay 94. Thus, opening of relays 94, 95 will deactivate the heating elements until control E is reset in the event the operation of relays 92, 93 fails to do so.
  • micro controller F When a dry start is detected, micro controller F pulses transistor 112 on and off to cause LED to blink once at intervals. Micro controller F may pulse transistor 112 on and off in different patterns or intervals to cause LED 114 to blink at different rates for indicating other malfunctions such as an excessive temperature readout at the top or bottom heating elements.
  • Micro controller F functions as a timing device for initially turning the bottom heating element on for several seconds and then delaying for a few minutes before the final temperature reading is recorded.
  • Micro controller F also functions as an actuator that activates and deactivates the heating elements by turning the transistors on or off to close or open relays in response to sensed temperature signals form thermistors 34, 36.
  • control E will preferably be programmed to deenergize and prevent further energization of both upper and lower heating elements in the event either the upper or lower thermistor were to become shorted or either thermistor were to open circuit.
  • a suitable visual and/or audible alarm may be incorporated in control E to indicate the occurrence of such an event.
  • control E will be designed to only operate the start up sequence described above with respect to the lower heating element.
  • thermistors 34 and 36 may be located anywhere on the tank B but in order to provide full advantage of the dry start protection feature, they should be located in close proximity to the respective heating elements.
  • the sensors could be clipped to the outwardly protruding spuds of the heating elements rather than placed in the base thereof.
  • the present invention has been described utilizing thermistors for sensing the temperatures, other types of sensors could be utilized in place thereof.
  • control E may also incorporate the ability to enable the turn off set point temperature to be varied depending upon the time of day and/or day of the week as well as to incorporate the ability to maintain a temporary reduced turn on set point temperature for an extended period of time (i.e. vacation set back).
  • This may be easily accomplished by providing a conventional programmable timer either integrated into control E or in the form of a separate assembly which may optionally be interconnected with control E.
  • the programmable timer will cooperate with the control E to vary the turn on set point utilized by control E and may allow for switching between two or more turn on temperature set points one or more times a day in different sequences for each day of the week.
  • the programmable timer may allow a programmed lower turn off set point to be held for an extended period of time (i.e. vacation set back).
  • extended period of time i.e. vacation set back
  • Such programmable timers are well known in the art and hence a detailed description thereof is not included here, the only modification thereto required being to provide for the programming of the various turn on set point temperatures.
  • FIG. 4 An exemplary programmable timer 200 is shown in Figure 4 in the form of an optional assembly that may be interconnected with control E by leads 202 and 204.
  • programmable timer includes on/off switches 206 and a select/program switch 208.
  • a display incorporated therein may display the time of day, day of the week and which of several operational modes has been selected. In the example shown, three off peak programs may be accommodated thus allowing for one program for Monday through Friday and separate programs for Saturday and Sunday as well as a vacation mode and a normal mode in which the programmable timer will not operate to vary the turn off set point.

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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)
  • Computer Hardware Design (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Control Of Resistance Heating (AREA)
EP00306820A 1999-08-13 2000-08-10 Méthode et dispositif de commande pour chauffe-eau électrique Withdrawn EP1076212A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37386399A 1999-08-13 1999-08-13
US373863 1999-08-13

Publications (2)

Publication Number Publication Date
EP1076212A2 true EP1076212A2 (fr) 2001-02-14
EP1076212A3 EP1076212A3 (fr) 2002-12-18

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EP00306820A Withdrawn EP1076212A3 (fr) 1999-08-13 2000-08-10 Méthode et dispositif de commande pour chauffe-eau électrique

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Country Link
EP (1) EP1076212A3 (fr)
CN (1) CN1284635A (fr)
AU (1) AU4880800A (fr)
CA (1) CA2314190A1 (fr)
NO (1) NO20004058L (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184630A2 (fr) * 2000-08-30 2002-03-06 State Industries, Inc. Chauffe-eau et son système de contrôle
WO2005094644A1 (fr) 2004-03-31 2005-10-13 Koninklijke Philips Electronics N.V. Procede de fonctionnement du chauffe-eau d'une cafetiere
WO2006000969A1 (fr) * 2004-06-23 2006-01-05 Koninklijke Philips Electronics N.V. Procede de chauffage d'une chaudiere de cafetiere
EP1619291A1 (fr) * 2004-07-14 2006-01-25 FUNG KAI TUNG, Augustine Dispositif de production de vapeur et fer à repasser utilisant ledit dispositif
WO2007028175A1 (fr) * 2005-09-02 2007-03-08 Andre Meinhard Fourie Dispositif de chauffage
CN1991273B (zh) * 2005-12-07 2011-09-21 Aos控股公司 流体加热设备、用于加热流体的电路及其操作方法
CN104414387A (zh) * 2013-08-28 2015-03-18 余伟文 一种能够自动蒸发茶水的功夫茶盘

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7380522B2 (en) * 2005-10-05 2008-06-03 American Water Heater Company Energy saving water heater
CN108332425A (zh) * 2018-01-05 2018-07-27 陈炳华 一种电热水器加热系统

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US2889444A (en) * 1957-10-22 1959-06-02 Theodor H Stiebel Electrically heated instantaneous hot water generator and storage tank
US5442157A (en) * 1992-11-06 1995-08-15 Water Heater Innovations, Inc. Electronic temperature controller for water heaters
US5449884A (en) * 1992-07-09 1995-09-12 Samsung Electronics Co., Ltd. Overheating prevention apparatus of a boiling clothes washing machine and method thereof
EP0672374A1 (fr) * 1994-03-15 1995-09-20 Zip Heaters (Aust.) Pty Limited Protection et contrôle de bouillories fonctionnant en continu
CA2158120A1 (fr) * 1995-09-12 1997-03-13 John Tracey Demaline Chauffe-eau commande par une minuterie
US5808277A (en) * 1995-06-15 1998-09-15 Dosani; Nazir Programmable thermostat to reduce bacterial proliferation to prevent legionellosis
US6137955A (en) * 1998-06-04 2000-10-24 American Water Heater Company Electric water heater with improved heating element
US6308009B1 (en) * 1998-06-04 2001-10-23 American Water Heater Company Electric water heater with electronic control
US20020125241A1 (en) * 1998-06-04 2002-09-12 Allen Scott Electric water heater with pulsed electronic control and detection

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2889444A (en) * 1957-10-22 1959-06-02 Theodor H Stiebel Electrically heated instantaneous hot water generator and storage tank
US5449884A (en) * 1992-07-09 1995-09-12 Samsung Electronics Co., Ltd. Overheating prevention apparatus of a boiling clothes washing machine and method thereof
US5442157A (en) * 1992-11-06 1995-08-15 Water Heater Innovations, Inc. Electronic temperature controller for water heaters
EP0672374A1 (fr) * 1994-03-15 1995-09-20 Zip Heaters (Aust.) Pty Limited Protection et contrôle de bouillories fonctionnant en continu
US5808277A (en) * 1995-06-15 1998-09-15 Dosani; Nazir Programmable thermostat to reduce bacterial proliferation to prevent legionellosis
CA2158120A1 (fr) * 1995-09-12 1997-03-13 John Tracey Demaline Chauffe-eau commande par une minuterie
US6137955A (en) * 1998-06-04 2000-10-24 American Water Heater Company Electric water heater with improved heating element
US6308009B1 (en) * 1998-06-04 2001-10-23 American Water Heater Company Electric water heater with electronic control
US20020125241A1 (en) * 1998-06-04 2002-09-12 Allen Scott Electric water heater with pulsed electronic control and detection

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184630A2 (fr) * 2000-08-30 2002-03-06 State Industries, Inc. Chauffe-eau et son système de contrôle
EP1184630A3 (fr) * 2000-08-30 2003-10-15 State Industries, Inc. Chauffe-eau et son système de contrôle
WO2005094644A1 (fr) 2004-03-31 2005-10-13 Koninklijke Philips Electronics N.V. Procede de fonctionnement du chauffe-eau d'une cafetiere
JP2007530910A (ja) * 2004-03-31 2007-11-01 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ コーヒーメーカー等の装置のボイラを動作させるための方法
US8555775B2 (en) 2004-03-31 2013-10-15 Koninklijke Philips N.V. Method for operating of a boiler of a device such as a coffee maker
WO2006000969A1 (fr) * 2004-06-23 2006-01-05 Koninklijke Philips Electronics N.V. Procede de chauffage d'une chaudiere de cafetiere
US8829398B2 (en) 2004-06-23 2014-09-09 Koninklijke Philips N.V. Heating process of a boiler of a coffee maker
EP1619291A1 (fr) * 2004-07-14 2006-01-25 FUNG KAI TUNG, Augustine Dispositif de production de vapeur et fer à repasser utilisant ledit dispositif
WO2007028175A1 (fr) * 2005-09-02 2007-03-08 Andre Meinhard Fourie Dispositif de chauffage
CN1991273B (zh) * 2005-12-07 2011-09-21 Aos控股公司 流体加热设备、用于加热流体的电路及其操作方法
CN104414387A (zh) * 2013-08-28 2015-03-18 余伟文 一种能够自动蒸发茶水的功夫茶盘
CN104414387B (zh) * 2013-08-28 2015-12-02 长乐市丽智产品设计有限公司 一种能够自动蒸发茶水的功夫茶盘

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CN1284635A (zh) 2001-02-21
EP1076212A3 (fr) 2002-12-18
AU4880800A (en) 2001-02-15
NO20004058D0 (no) 2000-08-11
CA2314190A1 (fr) 2001-02-13
NO20004058L (no) 2001-02-14

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