EP3227617B1 - Method of protecting the sieve wall of the combustion chamber of a fired heat exchanger, and a fired heat exchanger fitted with protection of the sieve wall of the combustion chamber - Google Patents

Method of protecting the sieve wall of the combustion chamber of a fired heat exchanger, and a fired heat exchanger fitted with protection of the sieve wall of the combustion chamber Download PDF

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Publication number
EP3227617B1
EP3227617B1 EP15816897.1A EP15816897A EP3227617B1 EP 3227617 B1 EP3227617 B1 EP 3227617B1 EP 15816897 A EP15816897 A EP 15816897A EP 3227617 B1 EP3227617 B1 EP 3227617B1
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EP
European Patent Office
Prior art keywords
heat exchanger
fired heat
combustion chamber
sieve wall
control unit
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.)
Active
Application number
EP15816897.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3227617A1 (en
Inventor
Krzysztof SZCZEPANSKI
Tomasz Siemienczuk
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AIC SA
Original Assignee
AIC SA
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Filing date
Publication date
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Priority to PL15816897T priority Critical patent/PL3227617T3/pl
Publication of EP3227617A1 publication Critical patent/EP3227617A1/en
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Publication of EP3227617B1 publication Critical patent/EP3227617B1/en
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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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/28—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
    • F24H1/287—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes with the fire tubes arranged in line with the combustion chamber
    • 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
    • F24H15/14—Cleaning; Sterilising; Preventing contamination by bacteria or microorganisms, e.g. by replacing fluid in tanks or conduits
    • 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
    • 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
    • F24H15/215—Temperature of the water before 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
    • F24H15/212—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
    • F24H15/235—Temperature of exhaust gases
    • 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
    • F24H15/305—Control of valves
    • F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
    • 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
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/0042—Cleaning arrangements
    • 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
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/04—Heating water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/08—Household apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/022—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers

Definitions

  • the invention concerns a method of protecting the sieve wall of the combustion chamber of a fired heat exchanger, and a fired heat exchanger fitted with protection of the sieve wall of the combustion chamber.
  • the solution is applicable to all devices equipped with fired heat exchangers, and particularly in boilers of domestic water heating installations.
  • devices fitted with fired heat exchangers work in systems which enable measuring the temperature of the fumes and the water they heat, where the operation of such elements as the fuel valve, exhauster, or ignition electrode are controlled according to the measured temperature.
  • the precipitation which occurs when the device fitted with a fired heat exchanger is in operation leads to accumulation of deposit (the so-called limescale) on the sieve wall of the combustion chamber on the side of the water chamber.
  • limescale is a good insulator, and when accumulated on the sieve surface it prevents heat transfer from the sieve surface to water.
  • an excessive build-up of limescale not only deteriorates heat parameters of the heat exchanger, but may also cause damage to the sieve wall in effect of overheating.
  • WO 2012/158050 A1 the fired heat exchanger comprising an outer jacket which encases a set of vertically running pipe elements anchored in sieve walls on both ends, a gas combustion chamber positioned over the upper sieve wall and a baffle mounted crosswise to the pipe elements.
  • the heat exchanger disclosed in publication US 2012/0138278 has an outer jacket with an inner set of vertical pipe elements fastened at their opposing ends in upper and lower sieve walls, gas combustion chamber located above the upper sieve wall and partitions mounted crosswise of the pipe elements according to the preamble of the indpendent claims.
  • the main components in the structure of fired heat exchangers known to date are: the combustion chamber with a sieve bottom, and fume ducts in the water chamber connected to the sieve bottom.
  • the whole system is encased in the outer jacket and closed with the cover of the combustion chamber; it is fitted with water inlet and outlet, fume exhaust, and burner elements.
  • Such heat exchangers usually work in systems fitted with temperature sensors at the water inlet and outlet, as well as valve sets and a unit which controls the functioning of the exchanger.
  • known fired heat exchangers the protection of the sieve wall of the combustion chamber is ensured by appropriate pre-treatment of water or selection of specific shapes for individual structural elements, which is intended to reduce limescale accumulation.
  • No fired heat exchangers known today in which the sieve wall of the combustion chamber would be entirely protected from damage caused by the accumulating limescale, irrespective of the shapes, sizes, or mutual arrangement of key elements of the heat exchanger.
  • the method of protecting the sieve wall of the combustion chamber of a fired heat exchanger, consisting in the removal, in any known way, of limescale accumulating on the sieve wall of the combustion chamber on the side of the water chamber according to the invention consists in that before a fired heat exchanger is started, the control unit of the fired heat exchanger is preprogrammed with a threshold temperature T g defined for the sieve wall of the combustion chamber, whereupon, during the operation of the fired heat exchanger, the actual temperature T a of the sieve wall of the combustion chamber is measured on the side of the water chamber using an additional temperature sensor. The signal from the additional temperature sensor is transmitted to the control unit and processed, following which the value of the actual temperature T a is compared against the threshold temperature T g .
  • control unit When both temperature values are equal, the control unit generates an alarm signal which informs that the fired heat exchanger should be/ is being switched off. Then, once the fired heat exchanger is off, the limescale accumulated on the sieve wall of its combustion chamber is removed in any known way.
  • the generated alarm signal is the main control signal which automatically closes the valve supplying fuel to the fired heat exchanger.
  • the main control signal transmitted from the control unit is accompanied by an additional signal which starts light and/or sound message in the signaling unit.
  • the generated alarm signal is an acoustic and/or sound signal only, in response to which the heat exchanger is switched off manually.
  • the actual temperature T a of the sieve wall is measured and recorded on a continuous basis.
  • the actual temperature T a of the sieve wall is measured and recorded cyclically at predetermined intervals.
  • the fired heat exchanger with protection of the sieve wall of the combustion chamber, fitted with an outer jacket which encases the combustion chamber, to which fume ducts placed in the water chamber adjacent to the combustion chamber are connected through the sieve wall and where the fired heat exchanger is connected to the control unit, according to the invention, is characterised in that it is fitted with an additional temperature sensor mounted in the socket on the sieve wall of the combustion chamber on the side of the water chamber and connected, either via a wire or wirelessly, to the control unit, which is not a part of the fired heat exchanger.
  • the additional temperature sensor is connected to the control unit via a connecting wire led through the pass-through port fixed tightly in the wall of the outer jacket.
  • the socket of the additional temperature sensor is a separate element fixed to the sieve wall.
  • the socket of the additional temperature sensor takes the form of an indentation in the sieve wall.
  • the additional temperature sensor is wireless.
  • the method and the heat exchanger according to the invention solve the problem of ensuring reliable and effective protection of the sieve wall of the combustion chamber from damage caused by overheating, whatever the fired heat exchanger type and irrespective of reckless maintenance.
  • FIG. 1 depicts the diagram of the system in which the exchanger works
  • Fig. 2 shows a fragment of the heat exchanger with the sieve wall protection in the first embodiment
  • Fig. 3 shows a fragment of the heat exchanger with the sieve wall protection in the first embodiment
  • Fig. 3 shows a fragment of the heat exchanger with the sieve wall protection in the first embodiment
  • Fig. 3 shows a fragment of the heat exchanger with the sieve wall protection in the first embodiment
  • Fig. 3 shows a fragment of the heat exchanger with the sieve wall protection in the first embodiment
  • Fig. 3 shows a fragment of the heat exchanger with the sieve wall protection in the first embodiment
  • Fig. 3 shows a fragment of the heat exchanger with the sieve wall protection in the first embodiment
  • Fig. 3 shows a fragment of the heat exchanger with the sieve wall protection in the first embodiment
  • Fig. 3 shows a fragment of the heat exchanger with the sieve wall protection in the first embodiment
  • Fig. 3 shows a fragment of the heat
  • a fired heat exchanger 1 is fitted with an outer jacket 2, inside which there is the combustion chamber 3 and water chamber 4 separated with a sieve wall 5, and equipped with inlet and outlet stub pipes for the supply and discharge of water and fumes.
  • the exchanger is fitted with valve 6 which supplies the fuel, blower 7 and ignition electrode 8, all connected to the control unit 9.
  • Other elements connected to the control unit 9 are: sensor one of temperature T1 at the water outlet, sensor two of temperature T2 at the water inlet, sensor three of temperature T3 at the fume outlet, and an additional sensor of temperature T4 mounted on the sieve wall 5 of the combustion chamber 3, on the side of the water chamber 4.
  • the control unit 9 is pre-programmed with the operation parameters for the specific fired heat exchanger 1, and then, when the exchanger is in operation, the first, second, and third sensor of temperatures T1, T2, and T3 send information to the control unit 9, i.e. the temperature of water at inlet and outlet, temperature of fumes discharged from the exchanger, and the data concerning the water flow rate.
  • the data are processed in a known way in the control unit 9 to signal S S which controls the functioning of valve 6 through which the fuel is supplied and of blower 7 by selecting an optimal fuel and air mix, and the gas flow rate.
  • the control unit 9 is also pre-programmed with the threshold value of temperature T g of the sieve wall 5, defined for the specific fired heat exchanger 1.
  • T g 130° C.
  • the actual temperature T a of the sieve wall 5 on the side of the water chamber 4 is measured continuously by an additional sensor of temperature T4.
  • the data are recorded and processed in the control unit 9 where the measured actual temperature T a is compared against the adopted threshold temperature T g .
  • limescale builds-up gradually on the sieve wall 5 which constitutes the bottom of the combustion chamber 3, on the side of the water chamber 4, thus reducing the reception of heat by the water flowing around the sieve wall and in consequence increases the temperature of the sieve wall 5.
  • the actual temperature T a becomes the same in value as the threshold temperature T g , i.e.
  • the main control signal S G closes valve 6 which supplies the fuel and switches off the blower 7 which supplies air to the mix burnt in the combustion chamber 3. This switches the exchanger off automatically.
  • an additional signal S D is transmitted from the control unit 9 to the signaling unit 10, which switches on a light message, such as a text communication on the display of the signaling unit 10, informing that maintenance of the device is required.
  • the additional signal S D may also trigger an acoustic alarm.
  • the installation should be disconnected from the water circulation system which should then be filled with an appropriate solution of a deposit-dissolving preparation. Once the de-scaling and flushing is complete, the installation is re-connected to the water circulation system in which the device containing the fired heat exchanger works.
  • the heat exchanger with the protection of the sieve wall in the exemplary embodiment is a fired heat exchanger 1 of a condensing boiler used in domestic central heating installations, connected to the control unit 9.
  • the exchanger is equipped with a cylindrical outer jacket 2 which encases the water chamber 4 having a cylindrical combustion chamber 3 installed in its upper part.
  • Forming the bottom of the combustion chamber 3 is the sieve wall 5 with openings in which vertical pipes are anchored to serve as ducts 11 in which the fumes formed in the combustion chamber flow through the water chamber 4.
  • the sieve wall 5 is conical in shape with its apex pointing down.
  • a socket 12 accommodating the additional sensor of temperature T4 fixed at the edge of the surface of the sieve wall 5, on the side of the water chamber 4.
  • the terminal 13 of the additional sensor of temperature T4 is led through the pass-through port 14 fixed tightly to the wall of the outer jacket 2 and then connected via a wire to the control unit 9.
  • Socket 12 is wedge-shaped and the additional sensor of temperature T4 and its terminal 13 are positioned horizontally.
  • Fig. 3 and Fig. 4 show two embodiments in which the additional sensor of temperature T4 is positioned at an angle, parallel to the conical sieve wall 5, where the sensor socket 12 takes the form of an appropriately shaped indentation in the sieve wall 5.
  • Fig. 3 and Fig. 4 show two embodiments in which the additional sensor of temperature T4 is positioned at an angle, parallel to the conical sieve wall 5, where the sensor socket 12 takes the form of an appropriately shaped indentation in the sieve wall 5.
  • Fig. 3 and Fig. 4 show two embodiments in which the additional sensor of temperature T4 is
  • the additional sensor of temperature T4 with the terminal 13 is positioned at an angle slanting downwards inside the water chamber 4, where its measurement head is fixed in the socket 12 formed in the sieve wall 5, and the terminal 13 has wires 15 led outside through the pass-through port in the wall of the outer jacket 2.
  • the solution can also be executed using an additional wireless sensor of temperature T4, as shown on Fig. 6
  • the signals containing information on the measured actual temperature T a are transmitted wirelessly from the additional sensor of temperature T4 to the control unit 9.
  • the exchanger will be switched-off automatically by the control unit when the temperature of the sieve wall rises by ca. 100°C above its temperature measured in a limescale-free exchanger.
  • the described embodiments do not exhaust all possible structural variants of either fired heat exchangers, or fixings of the additional temperature sensor to the sieve wall through which the combustion chamber is connected with the ducts in which the fumes flow in exchangers of the type.

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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)
  • Control Of Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)
EP15816897.1A 2014-12-04 2015-11-30 Method of protecting the sieve wall of the combustion chamber of a fired heat exchanger, and a fired heat exchanger fitted with protection of the sieve wall of the combustion chamber Active EP3227617B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15816897T PL3227617T3 (pl) 2014-12-04 2015-11-30 Sposób ochrony ściany sitowej komory spalania opalanego wymiennika ciepła i opalany wymiennik ciepła z ochroną ściany sitowej komory spalania

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL410385A PL410385A1 (pl) 2014-12-04 2014-12-04 Sposób ochrony ściany sitowej komory spalania opalanego wymiennika ciepła i opalany wymiennik ciepła z ochroną ściany sitowej komory spalania
PCT/PL2015/000192 WO2016089233A1 (en) 2014-12-04 2015-11-30 Method of protecting the sieve wall of the combustion chamber of a fired heat exchanger, and a fired heat exchanger fitted with protection of the sieve wall of the combustion chamber

Publications (2)

Publication Number Publication Date
EP3227617A1 EP3227617A1 (en) 2017-10-11
EP3227617B1 true EP3227617B1 (en) 2018-09-12

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EP15816897.1A Active EP3227617B1 (en) 2014-12-04 2015-11-30 Method of protecting the sieve wall of the combustion chamber of a fired heat exchanger, and a fired heat exchanger fitted with protection of the sieve wall of the combustion chamber

Country Status (4)

Country Link
EP (1) EP3227617B1 (pl)
ES (1) ES2700173T3 (pl)
PL (2) PL410385A1 (pl)
WO (1) WO2016089233A1 (pl)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL233814B1 (pl) * 2016-11-03 2019-11-29 Aic Spolka Akcyjna Opalany wymiennik ciepla z generatorem termoelektrycznym
PL72971Y1 (pl) * 2020-09-15 2023-04-17 Glowny Instytut Gornictwa Kocioł na paliwa gazowe, z palnikiem ceramicznym

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008215657A (ja) * 2007-02-28 2008-09-18 Noritz Corp 湯水加熱装置
US8286594B2 (en) * 2008-10-16 2012-10-16 Lochinvar, Llc Gas fired modulating water heating appliance with dual combustion air premix blowers
US8813688B2 (en) * 2010-12-01 2014-08-26 Aic S.A. Heat exchanger
WO2012158050A1 (en) * 2011-05-17 2012-11-22 Aic S.A. Boiler
US9435566B2 (en) * 2012-09-05 2016-09-06 Honeywell International Inc. Method and apparatus for detecting and compensating for sediment build-up in tank-style water heaters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2016089233A1 (en) 2016-06-09
PL410385A1 (pl) 2016-06-06
ES2700173T3 (es) 2019-02-14
EP3227617A1 (en) 2017-10-11
PL3227617T3 (pl) 2019-06-28

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