EP1595097B1 - Gas boiler - Google Patents

Gas boiler Download PDF

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Publication number
EP1595097B1
EP1595097B1 EP04713083A EP04713083A EP1595097B1 EP 1595097 B1 EP1595097 B1 EP 1595097B1 EP 04713083 A EP04713083 A EP 04713083A EP 04713083 A EP04713083 A EP 04713083A EP 1595097 B1 EP1595097 B1 EP 1595097B1
Authority
EP
European Patent Office
Prior art keywords
boiler
domestic
tank
heat exchanger
recirculating
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.)
Expired - Lifetime
Application number
EP04713083A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1595097A1 (en
Inventor
Giuseppe Bottarlini
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.)
Riello SpA
Original Assignee
Riello 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 Riello SpA filed Critical Riello SpA
Publication of EP1595097A1 publication Critical patent/EP1595097A1/en
Application granted granted Critical
Publication of EP1595097B1 publication Critical patent/EP1595097B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
    • F24H1/523—Heat exchangers for sanitary water directly heated by the burner
    • 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
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • 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
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water

Definitions

  • the present invention relates to a gas boiler.
  • the present invention relates to a wall-mounted combination gas boiler, i.e. a wall-mounted boiler for supplying both hot water to a heating circuit - hereinafter referred to as heating water - and domestic hot water.
  • a wall-mounted combination gas boiler normally comprises a heating circuit, along which hot heating water is conducted; and a domestic circuit, along which domestic water is conducted.
  • the heating circuit is connected to an external heating circuit equipped with radiators; and the domestic circuit is connected at one end to the water mains or other domestic water source, and, at the other end, to a circuit for distributing hot domestic water to one or more user devices.
  • a wall-mounted combination gas boiler also comprises a gas burner, and at least one heat exchanger for transferring the heat produced by the burner to the heating water and domestic water.
  • a boiler of the above type When hot domestic water is drawn off by a user device, a boiler of the above type operates as follows: on detecting domestic water flow, a flowmeter located along the domestic circuit lights the burner; and the domestic water is heated as it flows through the heat exchanger, and is fed to the user device.
  • the wall-mounted gas boiler described above has several drawbacks, by failing to supply the domestic water user device immediately with water at a predetermined temperature. That is, between the water being supplied and reaching a predetermined temperature, there is a transient period during which the domestic water is supplied at gradually increasing temperature until the predetermined temperature is reached.
  • Patent EP 719,989 proposes a wall-mounted combination gas boiler equipped with a storage tank, located along the domestic circuit, downstream from the heat exchanger, and with an auxiliary heating device for keeping the domestic water within a given temperature range inside the tank.
  • the auxiliary heating device is defined by an electric resistor inside the tank; a temperature sensor; and a control unit for activating the resistor as a function of the temperature detected.
  • the auxiliary heating device comprises an auxiliary heat exchanger inside the tank; a temperature sensor; and a control unit for selectively diverting hot water to the auxiliary heat exchanger, which is defined by a coil fed by the heating circuit.
  • a combination gas boiler for producing heating water and domestic water
  • the boiler comprising a heating circuit and a domestic circuit, a gas burner, a heat exchanger located along the domestic circuit, and at least one domestic water storage tank located downstream from said heat exchanger; the boiler being characterized by comprising a pump incorporated in said tank, and a domestic recirculating branch for selectively conducting domestic water from the tank to said heat exchanger.
  • auxiliary heating devices are provided, those already forming part of the boiler being used.
  • integrating the pump in the tank greatly simplifies the recirculating branch, and minimizes the number of component parts and assembly work required to implement recirculation.
  • the present invention also relates to a method of operating a gas boiler.
  • a temperature probe is located along the domestic circuit between said heat exchanger and said tank; the method being characterized by comprising the steps of:
  • Number 1 in Figure 1 indicates as a whole a wall-mounted combination gas boiler for supplying hot heating water and hot domestic water.
  • Boiler 1 comprises a casing indicated by a dot-and-dash line in Figure 1, and is connected to an external heating circuit 2 equipped with radiators indicated schematically by 3, to the water mains 4, to a domestic water user device 5, and to the gas mains 6.
  • boiler 1 comprises a heating circuit 7, a domestic circuit 8, a burner 9, and a bithermal exchanger 10 for exchanging combustion-generated heat with both the heating water circulating in circuit 7, and the domestic water circulating in domestic circuit 8.
  • Heating circuit 7 comprises a delivery branch 11, a return branch 12, and a bypass branch 13 connecting branches 11 and 12.
  • Return branch 12 is fitted with a heating water circulating pump 14, and an expansion vessel 15; and branch 13 is fitted with a bypass valve 16.
  • Domestic circuit 8 comprises a branch 17 for feeding cold domestic water to exchanger 10; a branch 18 for feeding hot domestic water from exchanger 10 to user device 5; a flowmeter 19 along branch 17; a storage tank 20 along branch 18; and a domestic recirculating branch 21 located between tank 20 and branch 17. That is, branch 21 connects tank 20 directly to branch 17, and comprises a non-return valve 22, so that domestic water only flows from tank 20 to branch 17.
  • Circuit 8 also comprises a temperature probe 23 located along branch 18, between heat exchanger 10 and tank 20; and boiler 1 comprises an insulating shell 24 surrounding tank 20.
  • tank 20 extends along an axis A, and comprises a cup-shaped body 25 open at one end; and a pump 26 fitted to, so as to form the cap of, cup-shaped body 25.
  • Cup-shaped body 25 is made of plastic material, extends along axis A, and comprises an end wall 27, a truncated-cone-shaped lateral wall 28 (tapering at an angle of close to zero), longitudinal stiffening ribs 29, and transverse stiffening ribs 30.
  • Three fittings 31, 32, 33 are located along cup-shaped body 25 to connect tank 20 to branches 18 and 21.
  • fitting 31 is located along wall 28, close to wall 27, to connect tank 20 to branch 18 from exchanger 10, and therefore defines a domestic water inlet of tank 20;
  • fitting 32 is located at pump 26 to connect branch 18 supplying user device 5, and defines a domestic water outlet of tank 20; and fitting 33 is located on the opposite side to fitting 32 and at pump 26 to connect tank 20 to recirculating branch 21, and defines a further domestic water outlet of tank 20.
  • body 25 comprises, at the open end, a flange 34 having, inside, a shoulder 35 perpendicular to axis A, a cylindrical wall 36, and a groove 36A ( Figure 4) extending along wall 36 and parallel to axis A, so as to form a seat 37 for pump 26.
  • pump 26 comprises a motor assembly 38 and a diffuser 39, which are fitted to cup-shaped body 25 to form tank 20.
  • Motor assembly 38 comprises a synchronous electric motor 40; a shaft 41 ( Figure 3); a radial-blade impeller 42; and a one-piece support 43 incorporating motor 40, and from which shaft 41 projects partly, and impeller 42 projects completely.
  • Motor assembly 38 comprises a rotor 44 incorporated in support 43.
  • support 43 comprises a shell 43A enclosing rotor 44; and a flange 45, from which impeller 42 projects, and along which is located a cylindrical projection 46 extending about axis A.
  • shell 43A and flange 45 are formed in one piece with no openings, and are made of plastic material permeable to electromagnetic waves, so that, in addition to supporting the component parts of motor assembly 38, support 43 also acts as a cap for cup-shaped body 25.
  • Diffuser 39 is formed in one piece of plastic material, is cup-shaped, and comprises a flat wall 47 perpendicular to axis A, and from which projects a cylindrical outer wall 48 having a rib 49 parallel to axis A. Diffuser 39 also comprises a volute 50 projecting on the opposite side to wall 48, and comprising a central suction hole 51 coaxial with axis A, and a lateral delivery hole 52 for connecting volute 50 to fitting 33. Diffuser 39 is housed inside seat 37 with wall 47 resting on shoulder 35, with wall 48 contacting wall 36, and with rib 49 engaging groove 36A to define a prismatic coupling and a one-only position of diffuser 39 with respect to cup-shaped body 25, so as to keep delivery hole 52 facing and connected to fitting 33.
  • Flange 45 of motor assembly 38 is fitted to flange 34 of cup-shaped body 25 so that impeller 42 is housed inside volute 50, and cylindrical projection 46 contacts the inner face of wall 48, and so that the top end of wall 48, wall 36, flange 45, and projection 46 form a closed cavity housing a seal 53.
  • boiler 1 also comprises a control unit 54, which receives signals from flowmeter 19 and probe 23, provides for on-off control of burner 9 and motor 40 of pump 26, and provides for setting external data, such as the desired domestic hot water temperature.
  • control unit 54 which receives signals from flowmeter 19 and probe 23, provides for on-off control of burner 9 and motor 40 of pump 26, and provides for setting external data, such as the desired domestic hot water temperature.
  • boiler 1 operates as follows.
  • tank 20 contains a mass of relatively hot domestic water heated in the course of the previous draw.
  • the temperature of the domestic water in tank 20 gradually falls.
  • pump 26 is activated, and the domestic water is recirculated through exchanger 10 and tank 20, while probe 23 detects a temperature T R related to the domestic water temperature.
  • the temperature values T R are compared with a set value T SET ; and, when the detected temperature T R is below the set temperature T SET , burner 9 is lit, and pump 26 is kept running until temperature T R reaches the set temperature T SET .
  • burner 9 is extinguished, and pump 26 continues recirculating the water for a predetermined time to acquire the residual heat from exchanger 10.
  • simply recirculating the domestic water through bithermal exchanger 10 may be sufficient to restore the water to the set temperature.
  • the recirculating step to determine whether the heat of exchanger 10 is sufficient to restore the required temperature conditions lasts about 30 seconds. If within this time the temperature is not restored, as determined by probe 23, control unit 54 provides for lighting burner 9 for a time period depending on the capacity of tank 20 and pump 26, and pump 26 continues recirculating the domestic water as described previously. Conversely, if water is being drawn off by user device 5, the signal from flowmeter 19 stops pump 26 or prevents the temperature-restoring operations from being started.
  • number 55 indicates a boiler mostly comprising component parts similar to those of boiler 1, and which are indicated in Figure 6 using the same reference numbers as in Figure 1.
  • Boiler 55 substantially differs from boiler 1 by bithermal exchanger 10 being replaced by a primary exchanger 56, which provides solely for heating heating water, and by a secondary exchanger 57 for transferring heat from heating circuit 7 to domestic circuit 8.
  • tank 20 and probe 23 are located along branch 18 of domestic circuit 8, downstream from secondary exchanger 57.
  • Heating circuit 7 comprises a recirculating branch 58 connecting branch 11 to exchanger 57; a branch 59 connecting exchanger 57 to branch 12; and an electrically controlled three-way valve 60 at the junction of branches 59 and 12.
  • control unit 54 is connected to three-way valve 60 and to pump 14 to regulate recirculation and heating of the heating water through exchangers 56 and 57. In exchanger 57, the heating water yields heat to the domestic water.
  • Operation differs from that described above by the temperature in tank 20 being maintained by recirculating the heating water and the domestic water. In all other respects, the temperature of the water in tank 20 is maintained as described with reference to the previous embodiment.
  • tank 20 by incorporating pump 26, also has the advantage that hydraulic testing of tank 20 actually also comprises hydraulic testing of pump 26. Moreover, tank 20 is compact and made of plastic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Gas Separation By Absorption (AREA)
  • Treating Waste Gases (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Glass Compositions (AREA)
  • Percussion Or Vibration Massage (AREA)
EP04713083A 2003-02-21 2004-02-20 Gas boiler Expired - Lifetime EP1595097B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI20030319 2003-02-21
IT000319A ITMI20030319A1 (it) 2003-02-21 2003-02-21 Caldaia a gas.
PCT/EP2004/050182 WO2004074744A1 (en) 2003-02-21 2004-02-20 Gas boiler

Publications (2)

Publication Number Publication Date
EP1595097A1 EP1595097A1 (en) 2005-11-16
EP1595097B1 true EP1595097B1 (en) 2007-04-04

Family

ID=32894165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04713083A Expired - Lifetime EP1595097B1 (en) 2003-02-21 2004-02-20 Gas boiler

Country Status (8)

Country Link
EP (1) EP1595097B1 (pl)
CN (1) CN100516704C (pl)
AT (1) ATE358801T1 (pl)
DE (1) DE602004005671T2 (pl)
ES (1) ES2283987T3 (pl)
IT (1) ITMI20030319A1 (pl)
PL (1) PL211041B1 (pl)
WO (1) WO2004074744A1 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3428546A1 (en) 2017-06-16 2019-01-16 Vaillant GmbH Electronically adjustable bypass valve integrated into the electronically controlled three-way valve

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20040821A1 (it) * 2004-12-28 2005-03-28 Renato Vaiani Gruppo idraulico integrato.
JP6246038B2 (ja) * 2014-03-20 2017-12-13 株式会社ガスター 熱源装置
CN106052115A (zh) * 2016-05-26 2016-10-26 珠海格力电器股份有限公司 壁挂炉及其控制方法
JP6745039B2 (ja) * 2016-11-25 2020-08-26 株式会社ノーリツ 暖房給湯装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3278122A (en) * 1964-03-02 1966-10-11 Laing Vortex Inc Central heating systems
FR2728960A1 (fr) * 1994-12-29 1996-07-05 Sdecc Chaudiere murale mixte a gaz avec un mini-ballon accumulateur d'eau chaude sanitaire
GB2330649A (en) * 1997-10-27 1999-04-28 Alpha Therm Limited A water heating arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3428546A1 (en) 2017-06-16 2019-01-16 Vaillant GmbH Electronically adjustable bypass valve integrated into the electronically controlled three-way valve

Also Published As

Publication number Publication date
DE602004005671T2 (de) 2007-12-27
ES2283987T3 (es) 2007-11-01
WO2004074744A1 (en) 2004-09-02
PL211041B1 (pl) 2012-04-30
ITMI20030319A1 (it) 2004-08-22
PL376936A1 (pl) 2006-01-09
ATE358801T1 (de) 2007-04-15
CN1754068A (zh) 2006-03-29
CN100516704C (zh) 2009-07-22
DE602004005671D1 (de) 2007-05-16
EP1595097A1 (en) 2005-11-16

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