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
  • 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
  • F24H1/12—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 in which the water is kept separate from the heating medium
  • F24H1/14—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 in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
  • F24H1/16—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 in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled
  • F24H1/162—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 in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled using electrical 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
  • F24H15/128—Preventing overheating
• • 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
  • F24H15/25—Temperature of the heat-generating means in the heater
• • 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
  • F24H15/335—Control of pumps, e.g. on-off control
  • F24H15/34—Control of the speed of pumps
• • 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

Definitions

• the invention relates to a heating element for continuous hot water production, as well as to a continuous hot water production device comprising such an element.
• heating element of the type comprising a water circulation pipe, an electric heating device disposed along a central heating portion of the circulation pipe, and a temperature sensor adapted to allow the regulation of the temperature of the water leaving the heating element.
• the sensor is disposed at the outer surface of the central heating portion, close to the electric heating device, and regulates the flow of water in the pipe (and therefore the heating time of water) in order to obtain a constant temperature at the outlet of the pipe.
• the temperature of the outlet water is dependent on the tolerances related to the geometrical dimensions of the heating portion, the pump, the electric heating device and the supply voltage.
• the temperature sensor can measure a temperature very different from one heating element to another, which creates a dispersion in the temperature measurements at the outlet of the circulation pipe of plus or minus 6 ° C compared to at the average value.
• the invention aims to provide a heating element whose temperature range of hot water leaving the circulation pipe is finer.
• the senor in the heating element of the aforementioned type, is disposed in contact with the water in circulation, in the wall defining the downstream portion of hot water outlet of the circulation pipe which is downstream of the central heating portion.
• the measured temperature is that of the water (since the sensor is in contact with it), and on the other hand, this measured temperature takes into account the variations in the transmission of energy. with water (since the sensor is downstream of the electric heating device). Thus, it is possible to regulate much more finely the temperature of the water at the outlet of the heating element.
• FIG. 1 is a partial view of a hot water production device comprising a heating element according to a first embodiment of the present invention
• FIG. 2 is a perspective view of the heating element of the first embodiment of the present invention
• FIG. 3 is an exploded perspective view of the zone of the heating element receiving the temperature sensor, taken from FIG. 2;
• FIG. 4 is a view similar to FIG. 2, corresponding to a second embodiment; , and
• Figure 5 is a view similar to Figure 3 corresponding to the second embodiment.
• a hot water production device 1 for producing hot water continuously, on demand comprises a cold water tank (removably mounted), a heating element 2 making it possible to produce hot water.
• hot water at high temperature at least 70 0 C, preferably about 100 0 C
• a pump for circulating the water in the heating element 2 comprises a pipe of water circulation 3 which is located downstream of the pump, and an electric heating device 4 adapted to heat the water flowing in the pipe 3.
• the pipe 3 is formed by an upstream portion 5 of cold water inlet, a central heating portion 6 and a downstream portion 7 of hot water outlet. More specifically, the upstream portion 5 extends from the pump to the central portion 6, and the downstream portion 7 extends from the central portion 6 to the water outlet 8 of the device
• the central portion 6 is defined as being the portion along which extends the electric heating device 4 which, here, is formed by a resistive track screen printed on the outer surface of this portion 6.
• the heating element 2 comprises a boiler 9 and a hot water dispensing nozzle 10.
• the boiler 9 is disposed in the housing of the hot water production device 1 and it comprises the upstream portion 5, the central portion 6 and the electric heating device 4.
• the dispensing nozzle 10, for its part, is formed by the downstream portion 7 and distributes the hot water in a container 18 such as a cup.
• the central portion 6 is of annular geometry. Thus, it is delimited radially by two tubes (here, coaxial), the water having a general flow which is parallel to the axis of the two tubes.
• the outer tube 11 which is metallic, carries on its external surface the electric heating device 4.
• the circuit of the water between the two tubes is a helical circuit around the axis of these.
• the progression step is axial and is defined by a radial inner wall itself helical.
• the helical inner wall of plastic material is carried by the inner tube which is also made of plastic.
• the very low inertia of the outer metal tube 11 as well as the plastic structure makes it possible to obtain a very rapid heating of the central portion 6 and the water.
• the hot water production device (more precisely, the heating element) comprises a temperature sensor which is adapted to allow the regulation of the temperature of the water at the outlet of the heating element (in the present case). for example, there are two temperature sensors).
• each temperature sensor 13, 14 has a negative temperature coefficient (CTN type sensor).
• the hot water production device 1 comprises a regulation module (electronic module).
• the regulation module makes it possible to vary the flow rate of the pump as a function of the temperature measured by the sensors 13, 14 (the power of the electric heating device 4 remaining constant).
• a first sensor 13 is fixed (here, welded) to the surface of the central portion 6 carrying the electric heating element (here, the outer surface of the outer tube 11).
• This first sensor 13, adjacent to the electric heating element 4, is connected to the control module so as to allow the main regulation of the water temperature: the pumping speed varies according to the temperature measured by the first sensor 13 in order to obtain a constant temperature at the outlet of the heating element 2 .
• a second sensor 14 is disposed in a wall delimiting the downstream portion 7 so as to be in contact with the water.
• the second sensor 14 is disposed near the upstream end of the downstream portion 7.
• this sensor 14 comprises a wafer 16 made of a thermally conductive material (here, ceramic) and an element 17 to negative temperature coefficient fixed to the wafer 16.
• the wafer 16 is sealed to a half-cylinder 15 and, with it, the wall of the downstream portion 7 (see FIG. 3).
• the wafer 16 is sealingly attached at a bend 20 (here, the angle of the bend 20 is 90 ° and the wafer 16 is fixed to form the outer bisector thereof. elbow 20).
• the heat exchanges are better and make it possible to have a more precise temperature and a shorter response time.
• the second sensor 14 is flush with this wall (the wafer 16 forms the inner surface of the wall), the temperature measurement is not disturbed by the dynamic of water in motion, nor by the presence of vapor bubbles contrary to what would happen if it were fixed in a dipping way in the flow.
• the arrangement of the second sensor 14 at a bend (more precisely, at the outer bisector of the bend) in the second embodiment makes it possible to have even better temperature measurements.
• the second sensor 14 is connected to the regulation module so as to enable the measurement taken by the first sensor 13 to be corrected. It thus makes it possible to measure the dispersion of elements such as the pump, the heating portion 6, the electrical element 4 heating and supply voltage and correct the resulting error. It thus allows a fine regulation of the water temperature at the outlet of the heating device 1.
• the invention is not limited to the present embodiment.
• the second sensor 14 it would thus be possible for the second sensor 14 to be disposed elsewhere in the downstream portion, in particular at the water outlet orifice 8 of the dispensing nozzle 10. In this case, the second sensor 14 also makes it possible to take into account the temperature variations due to the displacement of the water along the downstream portion 7, as well as those related to the material of the container 18 receiving the water.
• the sensor may be wireless, or be positioned at the top of the nozzle and comprise a heat conducting part coming into contact with the water.
• the second sensor 14 located in the downstream portion
• the first sensor 13 that arranged in the heating portion
• the wafer 16 of the second sensor 14 could be exposed to a thermally conductive material other than a ceramic, for example metal.

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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)
• Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Family Cites Families (8)

• 2009
  • 2009-03-02 FR FR0951300A patent/FR2942654B1/fr active Active
• 2010
  • 2010-02-23 CN CN201080010214.7A patent/CN102341659B/zh not_active Expired - Fee Related
  • 2010-02-23 EP EP10710375A patent/EP2404122A1/fr not_active Withdrawn
  • 2010-02-23 WO PCT/FR2010/050305 patent/WO2010100363A1/fr active Application Filing

Non-Patent Citations (2)

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