EP1559961A2 - Chaudière mixte - Google Patents

Chaudière mixte Download PDF

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Publication number
EP1559961A2
EP1559961A2 EP05100560A EP05100560A EP1559961A2 EP 1559961 A2 EP1559961 A2 EP 1559961A2 EP 05100560 A EP05100560 A EP 05100560A EP 05100560 A EP05100560 A EP 05100560A EP 1559961 A2 EP1559961 A2 EP 1559961A2
Authority
EP
European Patent Office
Prior art keywords
tank
domestic
boiler
water
hot
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Withdrawn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
EP05100560A
Other languages
German (de)
English (en)
Other versions
EP1559961A3 (fr
Inventor
Roberto Cavallini
Primo Filosi
Vladimir Butovskiy
Fulvio Freddi
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.)
Fondital SpA
Original Assignee
Fondital Fonderie Italiane Nuova Valsabbia SpA
Fondital SpA
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 Fondital Fonderie Italiane Nuova Valsabbia SpA, Fondital SpA filed Critical Fondital Fonderie Italiane Nuova Valsabbia SpA
Publication of EP1559961A2 publication Critical patent/EP1559961A2/fr
Publication of EP1559961A3 publication Critical patent/EP1559961A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle

Definitions

  • the present invention relates to a boiler for producing hot water, in particular a combination boiler, i.e. for producing both heating system hot water (supplied to a central heating circuit) and domestic hot water (supplied directly to user devices).
  • a combination boiler i.e. for producing both heating system hot water (supplied to a central heating circuit) and domestic hot water (supplied directly to user devices).
  • a combination boiler normally comprises a heat exchanger, in which heat generated by a burner is transferred to the heating system water.
  • a bithermal heat exchanger is used, in which the heating system water and the domestic water flow in separate circuits and are heated by combustion fumes.
  • only the heating system water flows in the heat exchanger, and releases heat to the domestic water in a secondary, e.g. plate-type, heat exchanger.
  • demand boilers domestic hot water is produced on user demand, so that the amount of water available to the user depends on the heating power of the boiler.
  • domestic water is heated in the tank by a spiral metal pipe, in which the heating system hot water circulates.
  • the heat exchange produced in this way is generally poor, and the amount of water actually available to the user is limited.
  • layer tanks are used to store hot water heated by external, e.g. plate-type, exchangers.
  • the efficiency of these tanks is greater than that of tanks with an internal coil, but is still not fully satisfactory.
  • the user can also choose whether to keep the water in the tank hot or cold: in the latter case, the boiler being operated solely to produce hot water on demand.
  • the domestic water heated in the heat exchanger flows anyway through the tank, releasing more or less heat to the (cold) water in the tank, depending on the amount of water drawn off.
  • a boiler for producing hot water in particular a combination boiler for producing heating water and domestic water, comprising a domestic circuit in which domestic water circulates; a heat exchanger located along the domestic circuit to transfer heat from a heating fluid to the domestic water; and at least one storage tank connected to the domestic circuit; the boiler being characterized by comprising on-off means for selectively and alternatively activating or cutting off domestic water flow through the tank.
  • an operating method of such a boiler characterized in that the boiler is operated alternatively in a demand operating mode, in which the on-off means cut off domestic water flow through the tank, and in a hot-water-storage operating mode, in which hot water stored previously in the tank is supplied.
  • Two boiler operating modes can be selected : a demand operating mode, i.e. in which domestic hot water is only produced on user demand; and a hot-water-storage operating mode, in which hot water is only stored in the tank pending greater demand.
  • demand operating mode the domestic hot water does not flow through the tank, which, even if it contains cold water, therefore does not subtract heat from the hot water.
  • the boiler is also cheap and simple to run and produce.
  • Number 1 in the accompanying drawing indicates as a whole a boiler for producing hot water, in particular a combination boiler for producing both heating hot water (supplied to a central heating circuit) and domestic hot water (supplied directly to user devices).
  • Boiler 1 comprises a casing 2 indicated by a dash line in the drawing and housing a domestic circuit 3, in which flows domestic water from an external (drinking water) mains 4, and a heating circuit 5, in which heating water flows, and which is connected to an external heating circuit 6 fitted, for example, with radiators 7.
  • Boiler 1 also comprises a first heat exchanger 10, in which the heat produced by combustion of a gas in a burner 11 connected to an external gas mains 12 is released to the heating water flowing in heating circuit 5; and a second heat exchanger 13 located along domestic circuit 3 to transfer heat from the heating water to the domestic water.
  • Heating circuit 5 is substantially known, and comprises a feed branch 14 from exchanger 10 to exchanger 13; and a return branch 15 from exchanger 13 to exchanger 10.
  • Feed branch 14 is fitted with a heating water pump 16; a three-way valve 17 connecting feed branch 14 to external heating circuit 6; and a temperature probe 18 at the outlet of exchanger 10.
  • a return branch 19 of external heating circuit 6 is connected to return branch 15.
  • Domestic circuit 3 comprises a cold branch 23 connecting water mains 4 to an inlet 24 of exchanger 13; a hot branch 25 connecting an outlet 26 of exchanger 13 to one or more user devices 27; and a utility branch 28 connecting cold branch 23 to hot branch 25 in parallel with exchanger 13.
  • Boiler 1 also comprises at least one storage tank 30 connected to domestic circuit 3 and located, in particular, along utility branch 28 in parallel with exchanger 13; and on-off means 31 for selectively and alternatively activating or cutting off domestic water flow through tank 30.
  • Tank 30 is connected to domestic circuit 3 by only two conduits 32, 33 substantially located at opposite, respectively top and bottom, ends 34, 35 of tank 30. More specifically, tank 30 is connected to domestic circuit 3 by a hot conduit 32 communicating with a top portion 36 of tank 30 and connected to hot branch 25; and by a cold conduit 33 communicating with a bottom portion 37 of tank 30 and connected to cold branch 23. A temperature probe 38 detects the temperature of the water in bottom portion 37 of tank 30. And tank 30 may be enclosed in a known thermal insulating shell (not shown for the sake of simplicity).
  • On-off means 31 comprise at least one on-off valve 41 located along utility branch 28, in particular along cold conduit 33, to selectively cut off domestic water flow along utility branch 28 and therefore through tank 30.
  • a domestic water pump 42 is located along domestic circuit 3 between exchanger 13 and tank 30, and in particular along hot branch 25.
  • Valve 41 and pump 42 are connected functionally to a known control unit 45, which is also connected functionally to burner 11; to a flow switch or flow meter 46 located along cold branch 23, upstream from connection of utility branch 28 to cold branch 23; and to a temperature probe 48 located along hot branch 25, at outlet 26 of exchanger 13.
  • Boiler 1 can operate alternatively in a demand operating mode and a hot-water-storage operating mode.
  • flow switch or flow meter 46 signals to control unit 45 the drawing off of water by a user device 27; control unit 45 lights burner 11 (if necessary); valve 41 is closed and tank 30 full; domestic water from water mains 4 flows along cold branch 23, through heat exchanger 13 (where it is heated), and along hot branch 25; and domestic water is prevented from flowing along utility branch 28 and through tank 30.
  • the water in tank 30 may be kept cold.
  • Hot-water-storage operating mode comprises a filling step in which tank 30 is filled with hot water, and a water delivery step, in which the water stored in tank 30 is supplied to user devices 27.
  • probe 38 signals to control unit 45 that the temperature of the water in tank 30 is below a predetermined threshold; control unit 45 opens valve 41 and starts pump 42 and, if necessary, burner 11; domestic water flows along cold branch 23, through exchanger 13 (where it is heated), and along hot branch 25 and utility branch 28 to fill tank 30; and the filling step continues until probe 38 signals the desired temperature (set beforehand on control unit 45) has been reached in tank 30.
  • flow switch or flow meter 46 signals to control unit 45 that water is being drawn by a user device 27; control unit 45 opens valve 41, starts pump 42, and, if necessary, lights burner 11; cold domestic water flows from water mains 4, partly to exchanger 13, where it is heated, and partly into the bottom of tank 30 along cold conduit 33; the hot water stored in tank 30 therefore flows out from conduit 32 and is added to the water that has flowed through exchanger 13, so that both the water produced in exchanger 13 and the water stored in tank 30 is available to user device 27.
  • Control unit 45 provides for setting operating parameters and programs externally, such as the temperature of the domestic water from exchanger 13, and operating mode times and durations.
  • control unit 45 therefore receives signals from flow switch or flow meter 46 and from probes 18, 38, 48, and, on the basis of preset operating parameters, besides lighting and extinguishing burner 11, accordingly opens/closes valve 41, and operates pump 42, so as to both cut off domestic water flow along utility branch 28 and through tank 30, and invert domestic water flow along utility branch 28 and through tank 30 to alternatively perform the filling and delivery step.
  • exchanger 10 is eliminated, and exchanger 13 along domestic circuit 3 is a bithermal exchanger associated with burner 11, and which yields heat, produced by combustion of gas in burner 11, both to the heating water in heating circuit 5 and to the domestic water in domestic circuit 3.
  • the heating fluid yielding heat to the domestic water is defined, in this case, by the combustion fumes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
EP05100560A 2004-01-30 2005-01-28 Chaudière mixte Withdrawn EP1559961A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20040150 ITMI20040150A1 (it) 2004-01-30 2004-01-30 Caldaia per la produzione di acqua calda in particolare caldaia combinata per la produzione di acqua di riscaldamento e di acqua sanitaria
ITMI20040150 2004-01-30

Publications (2)

Publication Number Publication Date
EP1559961A2 true EP1559961A2 (fr) 2005-08-03
EP1559961A3 EP1559961A3 (fr) 2006-02-15

Family

ID=34640380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05100560A Withdrawn EP1559961A3 (fr) 2004-01-30 2005-01-28 Chaudière mixte

Country Status (2)

Country Link
EP (1) EP1559961A3 (fr)
IT (1) ITMI20040150A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455575C1 (ru) * 2008-06-27 2012-07-10 Кюндон Нетуорк Ко., Лтд. Способ регулирования температуры горячей воды в системе горячего водоснабжения при низком расходе воды
CN105133234A (zh) * 2015-07-30 2015-12-09 江苏倪家巷集团精毛纺织有限公司 染整设备余热回收系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204708A (en) * 1935-03-25 1940-06-18 Honeywell Regulator Co Heating system
FR2551187B1 (fr) * 1983-08-26 1988-02-12 Laurent Francois Procede et installation pour la production d'eau chaude sanitaire a partir d'une installation generatrice de chaleur a bruleur
DE4035115C2 (de) * 1990-03-12 1993-11-04 Sandler Energietechnik Anordnung zum aufheizen und zum bereitstellen von warmem oder heissem brauchwasser von trinkwasserqualitaet

Non-Patent Citations (1)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455575C1 (ru) * 2008-06-27 2012-07-10 Кюндон Нетуорк Ко., Лтд. Способ регулирования температуры горячей воды в системе горячего водоснабжения при низком расходе воды
CN105133234A (zh) * 2015-07-30 2015-12-09 江苏倪家巷集团精毛纺织有限公司 染整设备余热回收系统

Also Published As

Publication number Publication date
EP1559961A3 (fr) 2006-02-15
ITMI20040150A1 (it) 2004-04-30

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