EP1548376A1 - Dispositif de post-chauffage pour chauffe-eau électrique à accumulation - Google Patents

Dispositif de post-chauffage pour chauffe-eau électrique à accumulation Download PDF

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Publication number
EP1548376A1
EP1548376A1 EP04028554A EP04028554A EP1548376A1 EP 1548376 A1 EP1548376 A1 EP 1548376A1 EP 04028554 A EP04028554 A EP 04028554A EP 04028554 A EP04028554 A EP 04028554A EP 1548376 A1 EP1548376 A1 EP 1548376A1
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EP
European Patent Office
Prior art keywords
water
heater
accumulator
water heater
temperature
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Withdrawn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
EP04028554A
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German (de)
English (en)
Inventor
Fausto Fioroni
Claudio Capitanelli
Luca Piaggesi
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.)
Thermowatt SpA
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Thermowatt SpA
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Publication date
Application filed by Thermowatt SpA filed Critical Thermowatt SpA
Publication of EP1548376A1 publication Critical patent/EP1548376A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F24H1/201—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes 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
    • 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
    • F24H1/121—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 using electric energy supply
    • F24H1/122—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 using electric energy supply combined with storage tank

Definitions

  • the present invention relates to an electric heating device aimed at improving accumulator water heater performance.
  • accumulator water heaters are able to distribute large quantities of water at a pre-set temperature, well over that normally required from taps in hand basins or showers, and therefore they are also able to satisfy several users' needs while using a relatively low energy consumption; in Italy this is generally 1200W for the more common models.
  • the disadvantage is that these models require many hours to top up the hot water supply once it has been used, and in spite of tanks being insulated, they also suffer from strong heat dispersion.
  • instant water heaters are able to supply an unlimited amount of hot water with practically no heat dispersion, but they use very high power consumption to satisfy each individual use each time.
  • a further problem linked with accumulator heaters is that of the so-called "mixing": each time water is drawn off, the cold water introduced mixes with the part of the hot water contained in the tank, lowering the temperature to below the temperature required by the user; this results in a reduction of the amount of water that can be used without further heating and therefore a reduction in performance as well as an increase in the time required for the mixed water to heat up again with consequential further heat dispersion.
  • This problem can be improved but with scarce results, by introducing the cold water with the least turbulence possible and into the bottom part of the tank. Naturally these problems do not exist with instant water heaters.
  • the main aim of the present invention is to create a device and a method that permit the advantages of the accumulator water heater with those of the instant heater while limiting the respective disadvantages, at least within the limits of a determined quantity of drawn hot water.
  • the aim of certain variants of the present invention is to indicate a device and method that permit the reduction of the water temperature in the accumulator water heater, with a consequential reduction in heat dispersion, while guaranteeing the user with the same performance, at least as far as standard service requirements are concerned, such as the amount of hot water required for one hot shower at a time.
  • Another particular aim of certain variants of the present invention is to reduce the negative effects caused by mixing, by reducing the amount of water which, in the accumulator water heater, drops below the temperatures required by the user each time water is drawn off.
  • Yet another aim of the present invention is to extend the above-described advantages to all types of traditional accumulator water heaters already installed and in use, by the simple addition of an accessory device, without modifying the existing accumulator water heater.
  • said additional heating method is composed of an additional post-heating and/or pre-heating of the heated water in the accumulator water heater, and the corresponding additional electrical device, which basically acts like an instant water heater, which will be described in more detail and which will hereafter be referred to briefly as additional heater, post-heater or pre-heater according to its function.
  • Figure 1 shows a traditional accumulator water heater according to known state of the art, having an additional heater being mounted downstream according to the invention. More precisely, the figure shows which of the two basic heater applications will be destined to act as the post-heater.
  • Figures 2.a, 2.b, 2.c, 2.d show certain possible embodiments of any one type of an additional heater according to the invention.
  • Figure 3 shows a traditional accumulator water heater according to state of the art, having an additional heater being mounted downstream according to the invention, using the second of the two basic applications, and destined to act as pre-heater.
  • Figures 4 and 5 show two variants of an accumulator water heater that are functionally equivalent according to known state of the art, an additional heater being mounted downstream according to the invention adapted to act separately and/or simultaneously in both functions as post-heater and/or pre-heater.
  • Said accumulator water heater 1 is composed of heating means 1.1 (naturally electric resistors, if the accumulator water heater 1 is electrical); the control means 1.2 of the accumulated water temperature (generally a thermostat); the intake pipe 1.3 and the outlet pipe 1.4; and the safety valve 1.5.
  • the control means 1.2 are programmed to maintain the water at a stored temperature ts, which is deliberately lower than the required temperature for use tu.r.
  • the dotted perimeter in figure 1 shows an additional heater 2 as a whole, composed of a post-heater according to the invention; this is basically composed of an instant electric water heater except for the fact that the electrical power available is not sufficient to heat the water as it arrives at main line temperature t H2O , (estimated at approximately 15 °C) as high as the required temperature for use, tu.r (that is estimated as being approximately 40 - 45 °C) when the outflow drawn off corresponds to the maximum calculated distribution for a shower or hand basin tap (equal to about 0,07 litres/second).
  • Groups of electric resistors 2.1 are associated with said pipe 2.5 to heat the inflow water raising the temperature by a quantity ⁇ tu.
  • the group of electric resistors 2.1 during water intake is activated by a flow meter 2.2. If the accumulator water heater 1 is electrical, while the flow meter 2.2 is activating the said group of electric resistors, it could be useful that it deactivates the electric resistors 1.1, by means of a switch 2.3, to prevent excessive power absorption.
  • a possible thermostat 2.4 is also shown which, according to the most appropriate type of method or means already in existence for instant water heaters, signals the measured temperature to a power modulator 2.6, which is able to vary the distributed electrical power by deactivating/activating one or more resistors 2.1 in sequence, or by modulating the electrical power; in the first case, said power modulator 2.6 acts to limit the maximum temperature, and in the second case, it acts as an actual temperature adjustment system for the water as it exits, maintaining the water at an established temperature tu.r. and equal to that required even though the flow rate may change.
  • the water is maintained at temperature ts, lower than the temperature tu.r required for use, thus needing heating completion by post-heater 2 only at the moment the water is drawn off.
  • the electrical power installed in domestic homes is fairly limited, generally about 3 - 4 kW
  • said post-heater 2 will also have similar installed electrical power to that of accumulator electrical bathroom water heaters (in Italy, as stated previously, rarely over 1200 W) in order to prevent electrical absorption overload, the accumulator water heater 1, where electrical, is deactivated when the post-heater 2 is switched on.
  • truncated smaller pipes 2.7 could be used arranged appropriately and connected in a row or in parallel mode for the water path; a further alternative aimed at reducing the length of said pipes even more, while guaranteeing a sufficient surface for the group of printed resistors 2.1, these could be composed of one or more barrels 2.8, also connected either in a row or in parallel mode.
  • the dotted perimeter in figure 3 globally shows a pre-heater 3 according to the invention; this is basically composed of an instant electric water heater with low electrical power, not necessarily sufficient to heat the main line water t H2O , to the required temperature for use tu.r or accumulated temperature t.s. when the drawn-off flow rate corresponds with the maximum calculated distribution for a shower or hand basin tap.
  • the figure schematically shows a pipe 3.5 from the pre-heater 3, mounted upstream of the accumulator water heater 1, that is, connected immediately before the intake pipe 1.3.
  • Groups of electric resistors 3.1 are associated with said pipe 3.5 to heat the inflow water raising the temperature by a quantity ⁇ ti.
  • a possible thermostat 3.4 mounted immediately downstream of pipe 3.5 acts at least to prevent the outflow water temperature at pipe 3.5 from exceeding acceptable limits.
  • the aforesaid elements described in figure 3 are identical or equivalent to those in figure 1 and can perform the same functions (including adjustment settings, switch-over, or cut-off of the electric resistors 3.1) with the only difference that in this case, instead of completing the heating action of the water destined for the user, they act to introduce pre-heated water into the accumulator water heater 1, naturally at a temperature that is lower than the temperature ts at which it is maintained inside the same accumulator water heater 1.
  • the term 'positive effect' refers to the increase in the amount of water that can be obtained continuously from an accumulator water heater 1 at a temperature that is higher or equal to that required by the user.
  • the said post-heater 2 and pre-heater 3 can be combined in a single heater device 4 to serve the same accumulator water heater 1.
  • an additional heater 5 can be provided mounted with a single group of resistors 5.1, adapted to supply heating energy simultaneously to both the introduced water as well as that drawn off the accumulator water heater 1. This can be obtained by foreseeing that said group of resistors, a "printed" type for example, release heat to a lapped metal wall on the opposite side to the said inflow and outflow water that are naturally separated from each other.
  • the additional heater according to any of the variants 2, 3, 4 or 5 illustrated up to this point, must be suitable for retrofitting assembly on all models of previously installed accumulator bathroom water heaters. Therefore it is advisable that said additional heaters 2, 3, 4 or 5 be also available in an accessory kit form that can be installed in proximity to or on the back of said accumulator water heater 1, and that they be functionally integrated. Retrofitting is very easy, as can be noted in figures 1, 3, 4 and 5, consisting simply of a plumbing connection that leaves the function of the accumulator water heater 1 completely unchanged, except for one aspect. If the accumulator heater is the electrical type, it may be advisable to supply electricity through a switch 2.3 for the reasons explained previously.

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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)
  • Heat-Pump Type And Storage Water Heaters (AREA)
EP04028554A 2003-12-22 2004-12-02 Dispositif de post-chauffage pour chauffe-eau électrique à accumulation Withdrawn EP1548376A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITAN20030070 2003-12-22
ITAN20030070 ITAN20030070A1 (it) 2003-12-22 2003-12-22 Dispositivo di post-riscaldamento per scaldaacqua elettrici ad accumulo.

Publications (1)

Publication Number Publication Date
EP1548376A1 true EP1548376A1 (fr) 2005-06-29

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Family Applications (1)

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EP04028554A Withdrawn EP1548376A1 (fr) 2003-12-22 2004-12-02 Dispositif de post-chauffage pour chauffe-eau électrique à accumulation

Country Status (2)

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EP (1) EP1548376A1 (fr)
IT (1) ITAN20030070A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2446159A (en) * 2007-01-30 2008-08-06 Zenex Technologies Ltd Pre-heater for central heating and hot water supply systems
CN100501263C (zh) * 2007-08-01 2009-06-17 王斌 即热容积合一式电热水器及其加热方法
CN101608825B (zh) * 2009-07-20 2011-01-05 乐清市传福电器有限公司 预即双模电热水器
CN102108732A (zh) * 2009-12-24 2011-06-29 吉博力国际股份公司 用于制备马桶的喷淋水的装置及操作该装置的方法
GB2479141A (en) * 2010-03-30 2011-10-05 Sean Bird Hybrid water heating system comprising electrical heating pods
ITVI20110279A1 (it) * 2011-10-20 2013-04-21 Daniela Cumerlato Impianto di riscaldamento dell'acqua
GB2504082A (en) * 2012-07-16 2014-01-22 Cyril Frank Temporary hot water system
WO2016107288A1 (fr) * 2014-12-29 2016-07-07 中车青岛四方机车车辆股份有限公司 Chauffe-eau électrique et procédé de chauffage d'eau pour véhicule ferroviaire
NL2026436B1 (en) * 2020-09-10 2022-05-09 Eneco B V Warm water supply arrangement
EP4040068A1 (fr) * 2021-02-08 2022-08-10 Yu-Chen Lin Dispositif de chauffage électrique intelligent

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040288A1 (de) * 1980-10-25 1982-06-03 Walter Ing.(grad.) 7758 Meersburg Holzer Heisswasserspeicher
DE3243845A1 (de) * 1981-12-03 1983-06-16 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Elektrisch beheizter heisswasserbereiter
JPS58120043A (ja) * 1982-01-12 1983-07-16 Matsushita Electric Ind Co Ltd 貯湯式給湯システム
DE8903652U1 (fr) * 1989-03-22 1989-05-11 Bosch-Siemens Hausgeraete Gmbh, 8000 Muenchen, De
DE8903651U1 (fr) * 1989-03-22 1989-05-11 Bosch-Siemens Hausgeraete Gmbh, 8000 Muenchen, De
GB2324014A (en) * 1997-04-01 1998-10-07 Caradon Mira Ltd Printed circuit instantaneous electric water heaters

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040288A1 (de) * 1980-10-25 1982-06-03 Walter Ing.(grad.) 7758 Meersburg Holzer Heisswasserspeicher
DE3243845A1 (de) * 1981-12-03 1983-06-16 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Elektrisch beheizter heisswasserbereiter
JPS58120043A (ja) * 1982-01-12 1983-07-16 Matsushita Electric Ind Co Ltd 貯湯式給湯システム
DE8903652U1 (fr) * 1989-03-22 1989-05-11 Bosch-Siemens Hausgeraete Gmbh, 8000 Muenchen, De
DE8903651U1 (fr) * 1989-03-22 1989-05-11 Bosch-Siemens Hausgeraete Gmbh, 8000 Muenchen, De
GB2324014A (en) * 1997-04-01 1998-10-07 Caradon Mira Ltd Printed circuit instantaneous electric water heaters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 227 (M - 248) 7 October 1983 (1983-10-07) *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2446159A (en) * 2007-01-30 2008-08-06 Zenex Technologies Ltd Pre-heater for central heating and hot water supply systems
GB2446159B (en) * 2007-01-30 2010-02-17 Zenex Technologies Ltd A heater for central heating and hot water supply systems
CN100501263C (zh) * 2007-08-01 2009-06-17 王斌 即热容积合一式电热水器及其加热方法
CN101608825B (zh) * 2009-07-20 2011-01-05 乐清市传福电器有限公司 预即双模电热水器
CN102108732B (zh) * 2009-12-24 2014-12-17 吉博力国际股份公司 用于制备马桶的喷淋水的装置及操作该装置的方法
EP2357423A1 (fr) * 2009-12-24 2011-08-17 Geberit International AG Dispositif de préparation d'eau de douche pour un WC doté d'une sous-douche et procédé de fonctionnement d'un tel dispositif
CN102108732A (zh) * 2009-12-24 2011-06-29 吉博力国际股份公司 用于制备马桶的喷淋水的装置及操作该装置的方法
US9021623B2 (en) 2009-12-24 2015-05-05 Geberit International Ag Device for preparing shower water for a water closet having an under-shower and method for operating such a device
GB2479141A (en) * 2010-03-30 2011-10-05 Sean Bird Hybrid water heating system comprising electrical heating pods
ITVI20110279A1 (it) * 2011-10-20 2013-04-21 Daniela Cumerlato Impianto di riscaldamento dell'acqua
GB2504082A (en) * 2012-07-16 2014-01-22 Cyril Frank Temporary hot water system
WO2016107288A1 (fr) * 2014-12-29 2016-07-07 中车青岛四方机车车辆股份有限公司 Chauffe-eau électrique et procédé de chauffage d'eau pour véhicule ferroviaire
NL2026436B1 (en) * 2020-09-10 2022-05-09 Eneco B V Warm water supply arrangement
EP4040068A1 (fr) * 2021-02-08 2022-08-10 Yu-Chen Lin Dispositif de chauffage électrique intelligent

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