EP1595097B1 - Gas boiler - Google Patents
Gas boiler Download PDFInfo
- 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
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 230000003134 recirculating effect Effects 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 239000008236 heating water Substances 0.000 claims abstract description 13
- 239000000523 sample Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
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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
- F24H1/48—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
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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
- F24H1/48—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.
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
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Abstract
Description
- The present invention relates to a gas boiler.
- More specifically, 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.
- 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.
- To eliminate the above drawback, 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. According to the above patent and patent application, 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. This solution is practical from the manufacturing standpoint, but expensive in terms of electricity consumption. In an alternative embodiment described in both the above patent and patent application, 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. This solution is cheaper to run, but has drawbacks as regards actual manufacture. That is, branching a conduit from the heating circuit into the tank complicates the tank and increases the number of components for assembly. In which connection, it should be borne in mind that the various assembled component parts must ensure correct hydraulic sealing and conform with strict safety regulations. Moreover, a hole in the coil would connect the heating circuit to the domestic circuit, thus seriously impairing the boiler as a whole.
- It is an object of the present invention to provide a combination gas boiler equipped with a storage tank, and which provides for keeping domestic water inside the storage tank within a given temperature range in a straightforward, low-cost manner, both functionally and constructionwise.
- According to the present invention, there is provided 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.
- According to the present invention, no auxiliary heating devices are provided, those already forming part of the boiler being used. Moreover, 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.
- According to the present invention, there is provided a method of operating a gas boiler as claimed in any one of Claims 1 to 19, wherein 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:
- recirculating domestic water through said tank and said heat exchanger at predetermined time intervals;
- acquiring a first temperature, related to the temperature of the domestic water, by means of said temperature probe during the recirculating step;
- comparing the first temperature with a set temperature;
- lighting the burner when the first temperature is below the set temperature, and continuing recirculation of the domestic water.
- A number of non-limiting embodiments of the present invention will be described by way of example with reference to the accompanying drawings, in which:
- Figure 1 shows a schematic view, with parts removed for clarity, of a gas boiler in accordance with the present invention and connected to external circuits;
- Figure 2 shows a larger-scale view in perspective of a storage tank of the Figure 1 boiler;
- Figure 3 shows a larger-scale section, with parts removed for clarity, of a detail of the Figure 2 tank;
- Figures 4 and 5 show larger-scale exploded views in perspective of a detail of the Figure 2 tank;
- Figure 6 shows a schematic view, with parts removed for clarity, of a variation of the Figure 1 boiler.
- 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 thewater mains 4, to a domesticwater user device 5, and to the gas mains 6. Inside the casing, boiler 1 comprises aheating circuit 7, adomestic circuit 8, aburner 9, and abithermal exchanger 10 for exchanging combustion-generated heat with both the heating water circulating incircuit 7, and the domestic water circulating indomestic circuit 8. -
Heating circuit 7 comprises adelivery branch 11, areturn branch 12, and abypass branch 13 connectingbranches Return branch 12 is fitted with a heatingwater circulating pump 14, and anexpansion vessel 15; andbranch 13 is fitted with abypass valve 16. -
Domestic circuit 8 comprises abranch 17 for feeding cold domestic water to exchanger 10; abranch 18 for feeding hot domestic water fromexchanger 10 touser device 5; aflowmeter 19 alongbranch 17; astorage tank 20 alongbranch 18; and a domesticrecirculating branch 21 located betweentank 20 andbranch 17. That is,branch 21 connectstank 20 directly tobranch 17, and comprises anon-return valve 22, so that domestic water only flows fromtank 20 tobranch 17.Circuit 8 also comprises atemperature probe 23 located alongbranch 18, betweenheat exchanger 10 andtank 20; and boiler 1 comprises aninsulating shell 24 surroundingtank 20. - With reference to Figure 2,
tank 20 extends along an axis A, and comprises a cup-shaped body 25 open at one end; and apump 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 anend wall 27, a truncated-cone-shaped lateral wall 28 (tapering at an angle of close to zero), longitudinalstiffening ribs 29, and transversestiffening ribs 30. Threefittings shaped body 25 to connecttank 20 tobranches wall 28, close towall 27, to connecttank 20 tobranch 18 fromexchanger 10, and therefore defines a domestic water inlet oftank 20;fitting 32 is located atpump 26 to connectbranch 18 supplyinguser device 5, and defines a domestic water outlet oftank 20; andfitting 33 is located on the opposite side to fitting 32 and atpump 26 to connecttank 20 to recirculatingbranch 21, and defines a further domestic water outlet oftank 20. With reference to Figures 3 and 4,body 25 comprises, at the open end, aflange 34 having, inside, ashoulder 35 perpendicular to axis A, acylindrical wall 36, and agroove 36A (Figure 4) extending alongwall 36 and parallel to axis A, so as to form aseat 37 forpump 26. - With reference to Figures 4 and 5,
pump 26 comprises amotor assembly 38 and adiffuser 39, which are fitted to cup-shaped body 25 to formtank 20.Motor assembly 38 comprises a synchronouselectric motor 40; a shaft 41 (Figure 3); a radial-blade impeller 42; and a one-piece support 43 incorporatingmotor 40, and from whichshaft 41 projects partly, and impeller 42 projects completely.Motor assembly 38 comprises arotor 44 incorporated insupport 43. In other words,support 43 comprises a shell43A enclosing rotor 44; and aflange 45, from which impeller 42 projects, and along which is located acylindrical projection 46 extending about axis A. That is, shell 43A andflange 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 ofmotor 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 cylindricalouter wall 48 having arib 49 parallel to axis A. Diffuser 39 also comprises avolute 50 projecting on the opposite side towall 48, and comprising acentral suction hole 51 coaxial with axis A, and alateral delivery hole 52 for connectingvolute 50 to fitting 33. Diffuser 39 is housed insideseat 37 withwall 47 resting onshoulder 35, withwall 48 contactingwall 36, and withrib 49engaging groove 36A to define a prismatic coupling and a one-only position ofdiffuser 39 with respect to cup-shaped body 25, so as to keepdelivery hole 52 facing and connected to fitting 33.Flange 45 ofmotor assembly 38 is fitted toflange 34 of cup-shaped body 25 so thatimpeller 42 is housed insidevolute 50, andcylindrical projection 46 contacts the inner face ofwall 48, and so that the top end ofwall 48,wall 36,flange 45, andprojection 46 form a closed cavity housing aseal 53. - With reference to Figure 1, boiler 1 also comprises a
control unit 54, which receives signals fromflowmeter 19 andprobe 23, provides for on-off control ofburner 9 andmotor 40 ofpump 26, and provides for setting external data, such as the desired domestic hot water temperature. - In actual use, boiler 1 operates as follows. When no water is being drawn by
user device 5,tank 20 contains a mass of relatively hot domestic water heated in the course of the previous draw. On account of inevitable heat losses, however, the temperature of the domestic water intank 20 gradually falls. At regular intervals, therefore,pump 26 is activated, and the domestic water is recirculated throughexchanger 10 andtank 20, whileprobe 23 detects a temperature TR related to the domestic water temperature. At this step, the temperature values TR are compared with a set value TSET; and, when the detected temperature TR is below the set temperature TSET,burner 9 is lit, andpump 26 is kept running until temperature TR reaches the set temperature TSET. When this occurs,burner 9 is extinguished, andpump 26 continues recirculating the water for a predetermined time to acquire the residual heat fromexchanger 10. In winter, simply recirculating the domestic water throughbithermal exchanger 10 may be sufficient to restore the water to the set temperature. The recirculating step to determine whether the heat ofexchanger 10 is sufficient to restore the required temperature conditions lasts about 30 seconds. If within this time the temperature is not restored, as determined byprobe 23,control unit 54 provides forlighting burner 9 for a time period depending on the capacity oftank 20 and pump 26, and pump 26 continues recirculating the domestic water as described previously. Conversely, if water is being drawn off byuser device 5, the signal fromflowmeter 19 stops pump 26 or prevents the temperature-restoring operations from being started. - With reference to the variation in Figure 6,
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 bybithermal exchanger 10 being replaced by aprimary exchanger 56, which provides solely for heating heating water, and by asecondary exchanger 57 for transferring heat fromheating circuit 7 todomestic circuit 8. In this case,tank 20 andprobe 23 are located alongbranch 18 ofdomestic circuit 8, downstream fromsecondary exchanger 57.Heating circuit 7 comprises arecirculating branch 58 connectingbranch 11 toexchanger 57; abranch 59 connectingexchanger 57 to branch 12; and an electrically controlled three-way valve 60 at the junction ofbranches control unit 54 is connected to three-way valve 60 and to pump 14 to regulate recirculation and heating of the heating water throughexchangers 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 intank 20 is maintained as described with reference to the previous embodiment. - The best results have been found to be achieved using a
tank 20 of preferably 2 to 5 litre capacity, apump 26 of 2 to 6 litre/minute capacity, and a synchronouselectric motor 40 of about 20 W, which provide for extremely short temperature-restoring cycles with very little electricity consumption. - In addition to the advantages already mentioned, it should be pointed out that
tank 20, by incorporatingpump 26, also has the advantage that hydraulic testing oftank 20 actually also comprises hydraulic testing ofpump 26. Moreover,tank 20 is compact and made of plastic material.
Claims (20)
- A combination gas boiler for producing heating water and domestic water, the boiler (1; 55) comprising a heating circuit (7) and a domestic circuit (8), a gas burner (9), a heat exchanger (10; 57) located along the domestic circuit (8), and at least one domestic water storage tank (20) located along the domestic circuit (8), downstream from said heat exchanger (10; 57); the boiler (1; 55) being characterized by comprising a recirculating pump (26) incorporated in said tank (20), and a domestic recirculating branch (21) for selectively conducting domestic water from the tank (20) to said heat exchanger (10; 57).
- A boiler as claimed in Claim 1, characterized in that said tank (20) comprises a cup-shaped body (25), and a cap defined by said recirculating pump (26).
- A boiler as claimed in Claim 2, characterized in that the cup-shaped body (25) comprises a first flange (34) which fits onto said recirculating pump (26).
- A boiler as claimed in Claim 2 or 3, characterized in that said cup-shaped body (25) comprises an inlet fitting (31), a first outlet fitting (32), and a second outlet fitting (33).
- A boiler as claimed in Claims 3 and 4, characterized in that the first and second outlet fitting (32, 33) are located at said first flange (34).
- A boiler as claimed in Claim 5, characterized in that the inlet fitting (31) is located along said cup-shaped body (25), at the opposite end to said first flange (34).
- A boiler as claimed in any one of Claims 2 to 6, characterized in that said cup-shaped body (25) is made of plastic material.
- A boiler as claimed in Claim 7, characterized in that the cup-shaped body (25) comprises stiffening ribs (29, 30).
- A boiler as claimed in any one of Claims 3 to 8, characterized in that said recirculating pump (26) comprises a motor assembly (38) and a diffuser (39), which are fitted to said cup-shaped body (25).
- A boiler as claimed in Claim 9, characterized in that said cup-shaped body (25) comprises a seat (37) at said first flange (34) for housing said diffuser (39).
- A boiler as claimed in Claim 10, characterized in that said diffuser (39) comprises a central suction hole (51) and a lateral delivery hole (52).
- A boiler as claimed in Claim 11, characterized in that said seat (37) and said diffuser (39) comprise respective elements for defining a prismatic coupling (36, 36A, 48, 49) and aligning the delivery hole (52) with the second outlet fitting (33).
- A boiler as claimed in any one of Claims 10 to 12, characterized in that said motor assembly (38) comprises a supporting member (43) having a second flange (45) connectable to said first flange (34).
- A boiler as claimed in Claim 13, characterized by comprising a seal (53) interposed between the cup-shaped body (25), the diffuser (39), and the motor assembly (38).
- A boiler as claimed in any one of the foregoing Claims, characterized in that said recirculating pump (26) is powered by a synchronous electric motor (40).
- A boiler as claimed in any one of the foregoing Claims, characterized in that said heat exchanger is a bithermal exchanger (10).
- A boiler as claimed in any one of the foregoing Claims, characterized in that said heat exchanger is a secondary exchanger (57) for transferring heat from the heating circuit (7) to the domestic circuit (8).
- A boiler as claimed in any one of the foregoing Claims, characterized by comprising a feed branch (17) for feeding domestic water to said heat exchanger (10; 57); said domestic recirculating branch (21) connecting the tank (20) directly to said feed branch (17).
- A boiler as claimed in Claim 18, characterized by comprising a non-return valve (22) along said domestic recirculating branch (21), so that domestic water is only fed along said domestic recirculating branch (21) from the tank (20) to said heat exchanger (10; 57).
- A method of operating a gas boiler as claimed in any one of Claims 1 to 19, wherein a temperature probe (23) is located along the domestic circuit (8) between said heat exchanger (10; 57) and said tank (20); the method being characterized by comprising the steps of:- recirculating domestic water through said tank (20) and said heat exchanger (10; 57) at predetermined time intervals;- acquiring a first temperature (TR), related to the temperature of the domestic water, by means of said probe (23) during the recirculating step;- comparing the first temperature (TR) with a set temperature (TSET);- lighting the burner (9) when the first temperature (TR) is below the set temperature (TSET), and continuing recirculation of the domestic water.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000319A ITMI20030319A1 (en) | 2003-02-21 | 2003-02-21 | GAS BOILER. |
ITMI20030319 | 2003-02-21 | ||
PCT/EP2004/050182 WO2004074744A1 (en) | 2003-02-21 | 2004-02-20 | Gas boiler |
Publications (2)
Publication Number | Publication Date |
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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 |
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Country | Link |
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EP (1) | EP1595097B1 (en) |
CN (1) | CN100516704C (en) |
AT (1) | ATE358801T1 (en) |
DE (1) | DE602004005671T2 (en) |
ES (1) | ES2283987T3 (en) |
IT (1) | ITMI20030319A1 (en) |
PL (1) | PL211041B1 (en) |
WO (1) | WO2004074744A1 (en) |
Cited By (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITBO20040821A1 (en) * | 2004-12-28 | 2005-03-28 | Renato Vaiani | INTEGRATED HYDRAULIC GROUP. |
JP6246038B2 (en) * | 2014-03-20 | 2017-12-13 | 株式会社ガスター | Heat source equipment |
CN106052115A (en) * | 2016-05-26 | 2016-10-26 | 珠海格力电器股份有限公司 | Wall-mounted furnace and control method thereof |
JP6745039B2 (en) * | 2016-11-25 | 2020-08-26 | 株式会社ノーリツ | Heating water heater |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3278122A (en) * | 1964-03-02 | 1966-10-11 | Laing Vortex Inc | Central heating systems |
FR2728960A1 (en) * | 1994-12-29 | 1996-07-05 | Sdecc | WALL MIXED GAS BOILER WITH MINI-BALLOON HOT WATER BATTERY |
GB2330649A (en) * | 1997-10-27 | 1999-04-28 | Alpha Therm Limited | A water heating arrangement |
-
2003
- 2003-02-21 IT IT000319A patent/ITMI20030319A1/en unknown
-
2004
- 2004-02-20 DE DE602004005671T patent/DE602004005671T2/en not_active Expired - Lifetime
- 2004-02-20 CN CNB2004800048630A patent/CN100516704C/en not_active Expired - Fee Related
- 2004-02-20 AT AT04713083T patent/ATE358801T1/en not_active IP Right Cessation
- 2004-02-20 WO PCT/EP2004/050182 patent/WO2004074744A1/en active IP Right Grant
- 2004-02-20 PL PL376936A patent/PL211041B1/en unknown
- 2004-02-20 EP EP04713083A patent/EP1595097B1/en not_active Expired - Lifetime
- 2004-02-20 ES ES04713083T patent/ES2283987T3/en not_active Expired - Lifetime
Cited By (1)
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 |
---|---|
CN1754068A (en) | 2006-03-29 |
CN100516704C (en) | 2009-07-22 |
DE602004005671T2 (en) | 2007-12-27 |
EP1595097A1 (en) | 2005-11-16 |
WO2004074744A1 (en) | 2004-09-02 |
DE602004005671D1 (en) | 2007-05-16 |
ES2283987T3 (en) | 2007-11-01 |
PL376936A1 (en) | 2006-01-09 |
ITMI20030319A1 (en) | 2004-08-22 |
PL211041B1 (en) | 2012-04-30 |
ATE358801T1 (en) | 2007-04-15 |
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