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US20090095235A1 - Heat exchanger for a combined boiler, and combined boiler using said heat exchanger - Google Patents

Heat exchanger for a combined boiler, and combined boiler using said heat exchanger Download PDF

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Publication number
US20090095235A1
US20090095235A1 US11/720,687 US72068705A US2009095235A1 US 20090095235 A1 US20090095235 A1 US 20090095235A1 US 72068705 A US72068705 A US 72068705A US 2009095235 A1 US2009095235 A1 US 2009095235A1
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United States
Prior art keywords
heat exchanger
fluid
connection
boiler
chamber
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Abandoned
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US11/720,687
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English (en)
Inventor
Alberto ALESSANDRINI
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Cosmogas SRL
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Cosmogas SRL
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Filing date
Publication date
Application filed by Cosmogas SRL filed Critical Cosmogas SRL
Assigned to COSMOGAS S.R.L. reassignment COSMOGAS S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALESSANDRINI, ALBERTO
Publication of US20090095235A1 publication Critical patent/US20090095235A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/14—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically both tubes being bent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
    • F24D3/087—Tap water heat exchangers specially adapted therefore
    • 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
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • 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
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/142—Connecting hydraulic components
    • 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
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/146—Connecting elements of a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
    • 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 an instantaneous heat exchanger for a boiler of a combined type, i.e., a boiler designed to produce both hot water for a plant for heating an environment and hot water for sanitary purposes.
  • the invention likewise relates to a boiler of a combined type using such an instantaneous heat exchanger.
  • the invention finds particular application in the case of boilers of a combined type that comprise:
  • the main heat exchanger which is usually of the type using a gas burner, brings about heating of the primary fluid which, via the pump, is made to circulate in the heating plant in order to supply a plurality of radiators located in a domestic environment.
  • a deviator device such as a three-way valve, enables circulation of the primary fluid only in the plant for heating the environment.
  • the deviator device directs, in all or in part, the primary fluid into the aforesaid auxiliary branch of the primary circuit, and then towards the auxiliary heat exchanger.
  • the auxiliary heat exchanger can carry out heating of the sanitary water by virtue of the fact that the heat of the fluid of the heating plant is transferred to said water.
  • the deviator device returns to its original position, so that the primary fluid returns to circulate only in the heating plant.
  • the means for deviating the primary fluid towards the auxiliary heat exchanger comprise, instead of a three-way valve, a second pump with respective valve.
  • Boilers of a combined type should ideally be able to guarantee an immediate production of hot sanitary water, be constructionally simple and inexpensive, and above all have small overall dimensions.
  • auxiliary heat exchangers of the plate type are used.
  • Said heat exchangers are basically constituted by a plurality of metal plates, packed together so as to define a certain number of parallel cavities.
  • the cavities are connected in alternating series so that, for example, the primary fluid circulates in the cavities of even number and the secondary fluid circulates in the cavities of odd number.
  • one of the two fluids can thus exchange heat with the other, through both of the plates that delimit the cavity itself.
  • the plate structure enables instantaneous heat exchangers to be obtained that are very compact and are provided with good characteristics of heat exchange.
  • plate-type heat exchangers for combined boilers have in effect become standardized components produced on a large scale, with evident advantages in terms of reduction of costs.
  • the plate-type heat exchangers currently used on compact combined boilers present some drawbacks.
  • a first drawback is represented by the fact that plate-type heat exchangers are particularly subject to clogging, typically on account of precipitation of lime within them. Said drawback is particularly felt in the case of boilers installed in areas where the mains water is very hard.
  • Another drawback is that the volume of water that can be stored within a plate-type heat exchanger of a compact boiler is very small, never greater than one litre for each circuit. Said reduced capacity of storage has two main negative consequences from the functional standpoint:
  • boilers of a combined type having a storage tank in which a certain amount of water is maintained at a given temperature, ready for use.
  • the storage tank has the function of maintaining a certain amount of water for heating at a given temperature, to be able to release it when required, in a fast way, to a secondary heat exchanger, so that this can produce the hot sanitary water quickly.
  • the primary heat exchanger can overcome the thermal inertia and will then be able to exploit its maximum power in favour of the secondary heat exchanger.
  • the temperature of the water in the tank is usually controlled via a suitable sensor.
  • the control system of the boiler issues a command for a new heating thereof, via appropriate electrical means (such as a resistance), or else by starting the primary heat exchanger and possibly the circulation pump.
  • the storage tank has, instead, the function of maintaining a certain amount of sanitary water at a given temperature, to be able to release it in a fast way following upon a requirement for use for washing purposes.
  • the primary heat exchanger can in the meantime reach its own maximum power and thus enable a secondary heat exchanger to function at normal running conditions.
  • the temperature of the sanitary water in the tank is controlled via a suitable sensor and, if required, heated via electrical means.
  • boilers provided with storage tanks are more cumbersome, they are, however, preferred in areas with very hard mains water.
  • combined boilers with a secondary plate-type heat exchanger continue to be very much in demand on account of their compactness and their contained cost, above all in areas where the level of hardness of the mains water is relatively low. Their functional limits in terms of times of response and constancy of supply are considered acceptable for a fair share of the market.
  • boiler manufacturers are thus forced to diversify their production, this being at the expense of the standardization of production.
  • the aim of the present invention is to solve the aforesaid problems. Said purpose is achieved, according to the invention, by a heat exchanger for a boiler of a combined type and by a boiler of a combined type having the characteristics indicated in the annexed claims, which form an integral part of the descriptive content of the present patent application.
  • FIG. 1 is a partial and schematic exploded view of a boiler of a combined type with plate-type heat exchanger of a standard type;
  • FIG. 2 is a front view of a plate-type heat exchanger used in the boiler of FIG. 1 ;
  • FIG. 3 is a perspective view of an instantaneous heat exchanger according to the invention.
  • FIG. 4 is a perspective view of the heat exchanger of FIG. 3 , with a part of the respective shell omitted;
  • FIG. 5 is a perspective view of an instantaneous heat exchanger in accordance with a preferred embodiment of the heat exchanger according to the invention.
  • FIG. 6 is a partially exploded view of the heat exchanger of FIG. 5 ;
  • FIG. 7 is a view similar to that of FIG. 1 , where, instead of a plate-type heat exchanger, there is envisaged the installation on the boiler of a heat exchanger according to the invention;
  • FIG. 8 is a schematic front view (inside the boiler) of the heat exchanger according to the invention connected to the respective means of hydraulic and mechanical interface of the boiler;
  • FIG. 9 is a cross-sectional view according to the line IX-IX of FIG. 8 ;
  • FIG. 10 is an enlarged detail of FIG. 9 ;
  • FIG. 11 is a partial and schematic view from beneath of a combined boiler provided with a heat exchanger according to the invention.
  • FIGS. 12 , 13 and 14 are, respectively, a front view, a first perspective view, and a second perspective view of a heat exchanger according to an advantageous variant of the invention, with a part of the respective shell omitted;
  • FIG. 15 is a longitudinal cross-sectional view of the heat exchanger of FIGS. 12-14 , at a larger scale.
  • FIG. 16 is a view similar to that of FIG. 1 , where adapter means usable in combination with a heat exchanger according to the invention are illustrated.
  • FIG. 1 Partially represented in FIG. 1 is a combined boiler of the type pre-arranged for installation of an auxiliary plate-type heat exchanger. It may be noted that, in said figure, as in some of the subsequent figures, only the components of the boiler useful for an understanding of the present invention are represented.
  • the boiler designated as a whole by 1 , presents an as a whole known structure and for this purpose comprises a body 2 for support and containment of the various functional components.
  • the overall dimensions of the body 2 may be approximately 450 mm in width, 325 mm in depth, and 800 mm in height.
  • a main heat exchanger represented only schematically and partially in the figures, designated by 3 and preferably of the gas-burner heat-exchanger type. From the main heat exchanger 3 there branches off a delivery branch and a return branch for a primary circuit, in which a primary fluid, typically water, for a domestic heating plant, is to circulate.
  • a primary fluid typically water
  • the delivery and return branches are provided with respective hydraulic connections, designated respectively by 4 and 5 , for connection to the pipes of the aforesaid heating plant (not represented).
  • the connections 4 and 5 preferably of a threaded type, are associated to a supporting plate, designated by P, fixed to the body 2 in the rear part of the latter.
  • connections 4 , 5 are in hydraulic communication with respective threaded connections 4 a , 5 a , between which there is to be installed a known by-pass pipe (not represented herein in so far as it is of a type and operation in themselves known).
  • the aforesaid delivery branch 4 and return branch 5 are moreover connected to one another by means of an auxiliary branch of the primary circuit, inside an auxiliary heat exchanger.
  • auxiliary branch of the primary circuit inside an auxiliary heat exchanger.
  • 6 and 7 For this purpose, from said two branches pipes are derived, designated by 6 and 7 , which terminate with respective hydraulic connections 8 and 9 supported by the plate P, designed for connection with a secondary plate-type heat exchanger, designated as a whole by 10 .
  • the reference numbers 11 and 12 designate two further hydraulic connections for connection with a branch, inside the heat exchanger 10 , of a secondary circuit, provided for heating sanitary water.
  • the attachments 11 and 12 are connected, via respective pipes 13 and 14 , to further connections, preferably of a threaded type associated to the plate P, designated by 15 and 16 , for connection to the rest of the secondary circuit, or to the plant for water for domestic washing purposes.
  • the arrangement or interface for connection of the boiler 1 is of a substantially standardized type for plate-type heat exchangers.
  • Said arrangement consists basically of two connection assemblies, designated by 17 and 18 , each having a respective connection 8 , 9 to the stretch inside the heat exchanger 10 of the auxiliary branch of the primary circuit, as well as a respective connection 11 , 12 to the stretch inside the heat exchanger 10 of the secondary circuit.
  • the axes of said connections 8 , 9 and 11 , 12 are parallel to one another.
  • the assemblies 17 and 18 further comprise a respective connection 4 , 5 to the domestic heating plant and a respective connection 15 , 16 to the plant for water for domestic sanitary purposes, said connections projecting below the plate P.
  • connections 8 , 9 and 11 , 12 are parallel to one another and extend perpendicularly with respect to the axes of the connections 8 , 9 and 11 , 12 .
  • the aforesaid connections 8 , 9 and 11 , 12 are of the quick-change type (i.e., they are not threaded) and for this purpose are provided with seats for the partial housing of respective O-rings, designated by 19 , typically having an internal diameter of 16 mm.
  • the ends of the connections 8 , 9 and 11 , 12 defining the seats for the O-rings 19 lie substantially on one and the same vertical plane.
  • each connection assembly 17 , 18 further envisages a seat 20 , designed to co-operate with a respective projection of the heat exchanger 10 , for the purposes of fixing the latter, via screws designated by 21 .
  • the axes of the seats 20 are parallel to the axes of the connections 8 , 9 and 11 , 12 .
  • FIG. 2 shows the front plate of the heat exchanger 10 that is not visible in FIG. 1 , i.e., the one that is to interface with the boiler 1 .
  • the heat exchanger 10 has, in its end plate 10 a , two upper holes, designated by 11 a and 12 a , horizontally aligned to one another, which are designed for connection with the connections 11 and 12 of the connection assemblies 17 , 18 .
  • the plate 12 a moreover envisages two lower holes 8 a , 9 a , aligned underneath the holes 11 a , 12 a , which are designed for connection to the connections 8 and 9 of the assemblies 17 and 18 . From the surface of the plate 10 a there moreover project two cylindrical projections 20 a , having an axial cavity provided with female thread.
  • the mechanical and hydraulic connection of the heat exchanger 10 is obtained by positioning the O-rings 19 in the respective connections 8 , 9 and 11 , 12 , the seats of which are sized so that a portion of said rings projects at the front on the outside of the seats themselves.
  • the heat exchanger 10 is then set up against the boiler 1 so that the projections 20 a of the front plate of the heat exchanger itself are inserted in the seats 20 of the assemblies 17 , 18 .
  • the screws 21 are screwed, through the open ends of the seats 20 , into the threaded holes of the projections 20 a , so as to bring the heat exchanger 10 progressively up to the connection interface until the front surface of the plate 10 a is brought into contact with the portions of the O-rings 19 projecting from the respective seats of the connections 8 , 9 and 11 , 12 , with the projecting portion of each O-ring 19 that in this way comes to surround a respective hole 8 a , 9 a and 11 a , 12 a of the heat exchanger 10 .
  • the further tightening of the screws 21 brings about elastic deformation of each O-ring 19 between the surface of the plate 10 a and the connections 8 , 9 and 11 , 12 of the assemblies 17 and 18 .
  • the heat exchanger 10 is then fitted mechanically and in a fluid-tight way to the respective connection interface of the boiler 1 .
  • the interface is practically of a standardized type for plate-type heat exchangers.
  • the standardized distance between centres of the holes 8 a and 11 a and the holes 9 a , 12 a i.e., the distance designated by A in FIG. 2
  • the distance between centres of the holes 8 a , 9 a and 11 a , 12 a i.e., the distance designated by B in FIG. 2
  • the distance between centres of the holes 8 a , 9 a and 11 a , 12 a i.e., the distance designated by B in FIG. 2
  • is standardized in three measurements namely, 154 mm, 172 mm, and 278 mm.
  • the reference number 23 designates a deviation device of a type in itself known, such as for example a three-way valve. As per the known art, said valve 23 is operative for deviating, if need be, the fluid for the domestic heating plant into the aforesaid auxiliary branch, and hence within the heat exchanger 10 .
  • the reference number 24 designates a sensor assembly, which can include a flow meter of an ON/OFF type or else of a modulating type, provided for detecting either a very precise flow rate or a water requirement in the secondary circuit, or else a requirement of a supply of hot sanitary water.
  • the control system of the boiler 1 brings about switching of the valve 23 so as to deviate the heating fluid of the primary circuit into the secondary heat exchanger 10 , as has been explained, at the same time activating the main heat exchanger 3 .
  • a temperature sensor having the function of monitoring the temperature of the sanitary water present within the auxiliary heat exchanger.
  • the control system issues a command to the valve 23 to deviate the heating fluid of the primary circuit into the secondary heat exchanger 10 , at the same time activating the main heat exchanger.
  • a temperature sensor is positioned in the proximity of the outlet branch 11 of sanitary water in order to control the temperature of the water and render it equal to the one required by modulation of the flame of the heat exchanger 3 .
  • FIGS. 3 and 4 show an instantaneous heat exchanger built according to the invention.
  • the heat exchanger designated as a whole by 30 , has an outer body or casing 31 , preferably made up of two half-shells 31 a and 31 b , for example made of metal material, which are then welded to one another.
  • the overall dimensions of the body 31 are approximately 390 mm in width, 115 mm in depth, and 256 mm in height.
  • the body 31 has a substantially toroidal overall shape, defining within it a substantially annular chamber.
  • One half of said chamber, designated by 32 is visible in detail in FIG. 4 , where the half-shell 31 b is not represented.
  • a spiral or coiled tubing Formed within the chamber 32 is an internal space for containment and storage, defined by a spiral or coiled tubing, designated as a whole by 33 , preferably made of metal.
  • the tubing 33 is wound in a helix that follows the annular development of the chamber 32 .
  • the heat exchanger 30 is provided with a respective connection “interface”, designed to enable the connection of the heat exchanger itself in the position where a plate-type heat exchanger 10 is normally installed.
  • the front half-shell 31 b of the heat exchanger 30 has two protuberances or projecting portions, designated by 34 and 35 .
  • the portions 34 , 35 can be formed by metal bodies, welded to the half-shell 31 b in a position corresponding to respective openings provided in the latter.
  • the portions 34 and 35 can be obtained directly via drawing of the half-shell 31 b , or else in the moulding step, in the case where the half-shells 31 a , 31 b are made, for example, of plastic material or aluminium.
  • the portions 34 , 35 each have a respective front, preferably plane, surface designated by 34 a , 35 a , provided with an upper hole 11 b , 12 b and a lower hole 8 b , 9 b .
  • the lower holes 8 b , 9 b communicate directly, via the hollow portions 34 , 35 , with the inside of the casing 31 , and hence with the chamber 32 .
  • a respective end 33 a , 33 b see FIG. 4 ) of the spiral tubing 33 inside the heat exchanger 30 .
  • cylindrical fixing projections 20 b Projecting moreover from the front surfaces 34 a , 35 a of the hollow portions 34 , 35 are cylindrical fixing projections 20 b , each provided with a respective threaded blind hole.
  • the arrangement of the holes 8 b , 9 b , 11 b , 12 b and of the projections 20 b is standardized, i.e., similar to that of the homologous elements 8 a , 9 a , 11 a , 12 a and 20 a of the plate-type heat exchanger 10 described previously.
  • FIGS. 5 and 6 illustrate an advantageous variant embodiment of the heat exchanger 30 , in accordance with which the two half-shells 31 a and 31 b of the body 31 are fitted to one another in a separable way, via screws or bolts, designated as a whole by 36 .
  • each half-shell 31 a , 31 b is provided with a respective peripheral flange 31 a ′, 31 b ′ and with a central wall 31 a ′′, 31 b ′′, in a position corresponding to which are provided holes 37 , for reciprocal fixing of the half-shells via the bolts 36 .
  • the front surfaces 34 a , 35 a of the portions 34 , 35 in which the holes for hydraulic connection 8 b , 11 b and 9 b , 12 b are present are constituted by plates or brackets fixed via screws 36 to the half-shell 31 b of the body 31 , also in this case with interposition of suitable sealing means.
  • the plates 34 a , 35 a are provided with seats or holes (not visible in the figure), in which are crimped or in any case mechanically immobilized the projections 20 b , which, in said embodiment, are hence configured as distinct components.
  • the heat exchanger 30 according to the variant of FIGS.
  • the two half-shells 31 a , 31 b can, if required, be separated from one another, by removing the screws or bolts 36 , in order to dismantle the spiral tubing 33 .
  • at least the two half-shells 31 a , 31 b can be made of aluminium or moulded plastic material, which enables good characteristics of thermal insulation for the water contained in the heat exchanger 30 to be obtained, without any need to equip the latter with specific casings or guards for thermal insulation.
  • the arrangement of the holes 8 b , 9 b , 11 b , 12 b and of the projections 20 b is similar to that of the homologous elements 8 a , 9 a , 11 a , 12 a and 20 a of the plate-type heat exchanger 10 described previously. Consequently, as may be appreciated from FIG. 7 , the heat exchanger 30 can be installed on the boiler 1 in a simple and fast way, with modalities similar to the ones described previously with reference to the plate-type heat exchanger 10 .
  • the projections 20 b can be fed into the seats 20 of the assemblies 17 , 18 .
  • the screws 21 are tightened through the aforesaid seats, in the threaded blind holes of the projections 20 b so as to “pull” the front surfaces 34 a , 35 a of the portions 34 , 35 of the heat exchanger 30 towards the connections 8 , 9 and 11 , 12 .
  • FIGS. 8 to 10 illustrate the modalities of fast coupling, in the absence of threaded hydraulic connections, which is obtained between the heat exchanger 30 and the arrangement for connection of the boiler 1 , constituted by the two connection assemblies 17 and 18 .
  • FIG. 8 is a view of the heat exchanger 30 from inside the boiler
  • FIG. 9 is a cross-sectional view according to the line IX-IX of FIG. 8
  • FIG. 10 is an enlarged detail of FIG. 9 .
  • the heat exchanger 30 is of the type with separable half-shells 31 a , 31 b , i.e., obtained according to FIGS. 5 and 6 .
  • portion 34 With the respective plate or front bracket 34 a .
  • un upper passage in which an end of the tubing 33 is inserted (here slightly projecting from the hole 11 b ), and a lower passage, which terminates in a position corresponding to the hole 8 b of the plate 34 .
  • O-rings provided between the plate 34 a and the body of the portion 34 are O-rings, designated by 34 c , in positions corresponding to the holes 8 b , 11 b .
  • a projection 20 b and the connections 8 and 11 of the assembly 17 with the respective seats in which the O-rings 19 find partial housing.
  • the projection 20 b is configured as element separate from the plate 34 a , with a region crimped or mechanically blocked in a respective seat provided in the plate itself; an internal region of the projection 20 is driven into the body of the portion 34 .
  • a screw 21 is tightened into the threaded hole of the projection 20 b , said screw 21 passing through the respective seat 20 provided in the body of the assembly 17 .
  • the heat exchanger 30 according to the invention can be installed, in a simple and fast way, on the boiler 1 in place of the plate-type heat exchanger 10 . This can be done in the final stages of a cycle of production of the boiler 1 , or else even directly at the premises of the end user, for the purposes of replacement of the plate-type heat exchanger 10 , if the latter is clogged.
  • FIG. 11 illustrates the heat exchanger 30 according to the invention in the installed condition. From said figure it may be appreciated how the heat exchanger 30 finds convenient housing in the rear part of the body 2 of the boiler 1 , within the latter. Moreover visible in said figure is the by-pass pipe previously mentioned, designated by 39 , which extends between the connections 4 a and 5 a of the primary circuit.
  • FIG. 6 further shows a central pipe union, which projects at the bottom from the supporting plate P. Said pipe union, designated by G, is provided for the connection of the boiler to a gas mains supply, necessary for operation of the burner of the main heat exchanger 3 .
  • Operation of the heat exchanger 30 is substantially similar to that of a traditional plate-type heat exchanger 10 as regards the step of heating of the water for sanitary purposes and as regards maintenance of the latter at the desired temperature, via the deviator valve 23 , the flow switch 24 , and the sensor means for sensing the temperature of the boiler 1 .
  • the heat exchanger 30 is conceived for obtaining a forced circulation, or a circulation in any case in a predefined direction, of the heating fluid within the chamber 32 .
  • the heat exchanger is pre-arranged so that the flow of the sanitary water present in the coiled tubing 33 will come about in countercurrent, i.e., in a direction opposite to the flow of the heating fluid. Said advantageous embodiment of the invention is illustrated in FIGS. 12-15 .
  • positioned in the chamber 32 are, in addition to the coiled tubing 33 , a flow divisor 40 , un upper flow deviator 41 and a lower flow deviator 42 .
  • the divisor 40 is substantially configured as a wall or partition having the function of enabling circulation of the fluid in just one direction within the chamber 32 , from the respective inlet 8 b to the respective outlet 9 b .
  • the flow deviators 41 , 42 have here a basically hollow cylindrical shape, each having a closed end that opposes the direction of the flow of the fluid within the chamber 32 . As may be seen in FIG. 14 or FIG. 15 , the deviators 41 , 42 are each positioned in a respective substantially rectilinear stretch of the coil formed by the tubing 33 .
  • the reference number 43 designates a device for bleeding the chamber 32 , said device being of a conception in itself known.
  • the fluid coming from the primary circuit penetrates into the chamber 32 through the opening 8 b .
  • the fluid is forced to traverse the chamber 32 in a unidirectional way, in the direction designated by the arrow F 1 in FIG. 14 .
  • the fluid encounters the upper flow deviator 41 , and in particular its closed end, designated by 41 a in FIG. 15 .
  • the fluid is forced to flow necessarily between the coils of the tubing 33 that wind around the body of the deviator itself. In this way, heat exchange is increased in the upper part of the heat exchanger 30 .
  • part of the fluid can then fill the deviator 41 , entering from the open end of the latter, designated by 41 b .
  • Another part of the fluid proceeds, instead, along the annular development of the chamber 32 , until it encounters the lower flow deviator 42 .
  • the fluid encounters first the closed end of the deviator 42 , designated by 42 a in FIG. 15 .
  • the fluid is then forced between the coils of the tubing 33 that wind around the body of the deviator 42 . In this way, heat exchange is increased in the lower part of the heat exchanger 30 .
  • the fluid In the rest of its path, the fluid then reaches the divisor 40 , which, on the one hand, prevents the fluid itself from re-circulating in the heat exchanger and, on the other, causes the fluid to fill the deviator 42 , entering from the open end 42 b of the latter (see FIG. 15 ).
  • the divisor 40 prevents the fluid itself from re-circulating in the heat exchanger and, on the other, causes the fluid to fill the deviator 42 , entering from the open end 42 b of the latter (see FIG. 15 ).
  • the closed end 42 a of the deviator 42 there branches off a stretch of tube, designated by 44 , which connects the inside of the deviator itself with the opening 9 b of the heat exchanger 30 . In this way, the heating fluid can then come out of the chamber 32 and return into the primary circuit.
  • the coiled tubing 33 is configured so that the flow of the sanitary water inside it flows in a direction opposite to that of the heating fluid, as indicated by the arrow F 2 of FIG. 14 .
  • the sanitary water penetrates into the tubing 33 from the inlet 12 b .
  • a first stretch of the tubing 33 designated by 33 c , extends within the hollow body of the lower deviator 42 , then traversing the cylindrical wall thereof. The tubing then proceeds following its coiled pattern along the development of the chamber 32 , to terminate in a position corresponding to the hole 11 b , as may be seen particularly in FIG. 14 .
  • a first advantage is represented by the fact that the heat exchanger 30 according to the invention, even though it is in any case an instantaneous heat exchanger, enables accumulation within it of a substantial mass of water in the respective portions of circuit, which can be maintained at the desired temperature, waiting to be drawn off.
  • the heat exchanger 30 guarantees a substantial storage of sanitary water within the tubing 33 as compared to the usual plate-type heat exchangers for compact boilers, and in any case greater than one litre, preferably greater than two litres.
  • the amount of sanitary water that can be stored in the heat exchanger 30 is approximately 4-5 litres, i.e., equal to at least four times the quantity that can be stored within a plate-type heat exchanger of the maximum capacity currently used for combined compact boilers.
  • the heat exchanger 30 enables an adequate convenience of supply to be achieved, with fast delivery of a considerable mass of hot sanitary water, in short times and in a constant way, even in the presence of changes of flow rate, but without the need to equip the boiler with a specific storage tank.
  • the properties of heat exchange moreover remain unvaried, notwithstanding the difference of the volume of water contained.
  • heat exchanger 30 is less subject to clogging, since the mains water for sanitary purposes passes through a single tube (i.e., the spiral tubing 33 ), and not through a series of cavities of small cross section in series, as occurs, instead, in the plate-type heat exchanger.
  • the boiler can be equipped with the heat exchanger 30 .
  • the boiler 1 can in any case be installed with the traditional plate-type heat exchanger 10 .
  • the invention enables important advantages to be obtained also for boiler manufacturers, for which the need to diversify production is reduced. In fact, it is possible to obtain two different types of products starting from one and the same basic structure of the boiler 1 . Only in the advanced stage of production, the latter may be diversified, by installing the plate-type heat exchanger 10 to meet said type of requirement, or else the heat exchanger 30 according to the invention, thus preventing the need to equip the boiler with additional storage tanks.
  • FIG. 16 Illustrated in FIG. 16 is a further possible variant of the invention, according to which there are provided adapter elements, designated as a whole by 50 .
  • adapter elements designated as a whole by 50 .
  • the distance between centres of the holes 8 a 11 a and 9 a , 12 a of the plate-type heat exchangers used in compact combined boilers is standardized in some standard measurements (see what was described previously with reference to the distances designated by A and B in FIG. 2 ).
  • the adapters 50 there can thus be provided the adapters 50 to enable installation of a single version of heat exchanger 30 on combined boilers having different standardized attachments.
  • each adapter 50 comprises a substantially L-shaped body, for example made of metal material, so as to define two surfaces 50 a and 50 b opposite and parallel to one another, the first designed to co-operate with the connections 8 , 11 or 9 , 12 of the boiler 1 , and the second designed to co-operate with the holes 8 b , 11 b or 9 b , 12 b of the heat exchanger 30 .
  • the body of each adapter 50 is provided with two respective internal passages.
  • the ends of said passages form holes (not visible in the figure), designed to co-operate with the connections 8 , 11 or 9 , 12 of the boiler 1 .
  • the ends of the same passages form, instead, holes 8 c , 11 c or 9 c , 12 c , designed to co-operate with the holes 8 b , 11 b or 9 b , 12 b of the heat exchanger 30 .
  • each adapter there are moreover provided mechanical fixing seats; for example, a first threaded through seat 51 can be provided, designed to receive the end of a respective screw 21 for fixing of the adapter 50 to a respective assembly 17 , 18 .
  • the body of the adapter can then comprise a second seat 52 with open end, designed to receive a respective projection 20 b of the heat exchanger 30 for fixing via a respective screw (i.e., with modalities similar to the ones described previously with reference to the seats 20 , the screws 21 , and the projections 20 b ).
  • a respective screw i.e., with modalities similar to the ones described previously with reference to the seats 20 , the screws 21 , and the projections 20 b .
  • the seal between the adapters 50 and the attachments of the boiler will be obtained via the O-rings 19 described previously.
  • the seal between the adapters 50 and the heat exchanger 30 will be obtained via similar O-rings, operatively set between the surface 50 b of the adapter and a respective surface 34 a , 35 b of the heat exchanger.
  • the holes 8 c , 11 c and/or 9 c , 12 c may be provided with a peripheral seat for partial housing of said O-rings.
  • Each internal passage of an adapter 50 can be obtained by making, in the body of the adapter itself, three blind holes, two parallel to one another and one orthogonal to these, which intersects them. For said reason, the end of the aforesaid orthogonal hole, designated by 53 in FIG. 9 must be occluded in a sealed way, for example using appropriate plugs, two of which are designated by 54 in the Figure.
  • the adapter elements 50 there can be provided some versions of half-shell 31 b , differentiated with respect to one another by the position of the projecting portions 34 , 35 with respect to one another and/or by the position of the holes 8 b , 9 b , 11 b , 12 b and of the projections 20 b within said portions.
  • the instantaneous heat exchanger according to the invention may also have a shape different from the substantially toroidal one illustrated previously; for example, it may as a whole be cylindrical, at the same time maintaining its capacity for storing a substantial mass of water unaltered and maintaining the prearrangement for installation in the place of an ordinary plate-type heat exchanger.
  • the body of the heat exchanger will be provided with the projecting portions, similar to the ones previously designated by 34 , 35 , and a single chamber in which a tubing or pipe in the form of a coil extends. It may be noted that a single projecting portion could also be provided, equipped with the inlets and outlets 8 b , 9 b , 11 b , 12 b in the appropriate positions.
  • the heat exchanger could be designed for storing, within the coil-shaped channel 33 , the heating fluid of the primary circuit, and, in the chamber 32 , the water for washing purposes, and thus with an arrangement of connection that is reversed with respect to the one previously described by way of example.
  • the holes 8 b , 9 b and 11 b , 12 b of the heat exchanger 30 could be shaped so as to present an annular peripheral seat for housing a portion of the respective O-ring 19 .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Water Supply & Treatment (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
US11/720,687 2004-12-01 2005-11-11 Heat exchanger for a combined boiler, and combined boiler using said heat exchanger Abandoned US20090095235A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000846A ITTO20040846A1 (it) 2004-12-01 2004-12-01 Scambiatore di calore per una caldaia di tipo combinato, e caldaia di tipo combinato impiegante tale scambiatore di calore
ITTO2004A000846 2004-12-01
PCT/IB2005/003604 WO2006059208A1 (fr) 2004-12-01 2005-11-30 Echangeur thermique pour chaudiere combinee, et chaudiere combinee utilisant un tel echangeur thermique

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US20090095235A1 true US20090095235A1 (en) 2009-04-16

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US (1) US20090095235A1 (fr)
EP (1) EP1831609B1 (fr)
AT (1) ATE508333T1 (fr)
CA (1) CA2588748A1 (fr)
DE (1) DE602005027900D1 (fr)
IT (1) ITTO20040846A1 (fr)
WO (1) WO2006059208A1 (fr)

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US20110308767A1 (en) * 2010-06-19 2011-12-22 Grundfos Management A/S Housing unit for a heating system
JP2015501397A (ja) * 2011-10-11 2015-01-15 スネクマ 流体を加熱するための装置
US20150129168A1 (en) * 2013-11-08 2015-05-14 Valeo Systemes Thermiques Heat Exchanger Comprising A Heat-Exchanger Core Bundle Connected At Two Opposite Ends To The Walls Of The Housing
JP2018109481A (ja) * 2017-01-06 2018-07-12 株式会社ノーリツ 暖房給湯装置
JP2018109482A (ja) * 2017-01-06 2018-07-12 株式会社ノーリツ 暖房給湯装置

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EP2413044B1 (fr) * 2010-07-30 2015-10-28 Grundfos Management A/S Unité de chauffage d'eau potable
GB201310821D0 (en) 2013-06-18 2013-07-31 Sunamp Ltd Energy storage system
PL2937657T3 (pl) * 2014-04-25 2020-04-30 Franke Technology And Trademark Ltd Wymiennik ciepła
IT201800003056A1 (it) * 2018-02-26 2019-08-26 Gianluca Lupo Procedimento e dispositivo di collegamento di una caldaia murale rispetto a un impianto idraulico di acqua calda sanitaria e/o di riscaldamento e relativo impianto gas
FR3086996B1 (fr) * 2018-10-08 2020-12-04 Soc Ind De Chauffage Sic Dispositif combine mural de chauffage de l'eau sanitaire et de l'eau de chauffage d'un local

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US20110308767A1 (en) * 2010-06-19 2011-12-22 Grundfos Management A/S Housing unit for a heating system
US9612036B2 (en) * 2010-06-19 2017-04-04 Grundfos Management A/S Housing unit for a heating system
JP2015501397A (ja) * 2011-10-11 2015-01-15 スネクマ 流体を加熱するための装置
US20150129168A1 (en) * 2013-11-08 2015-05-14 Valeo Systemes Thermiques Heat Exchanger Comprising A Heat-Exchanger Core Bundle Connected At Two Opposite Ends To The Walls Of The Housing
JP2018109481A (ja) * 2017-01-06 2018-07-12 株式会社ノーリツ 暖房給湯装置
JP2018109482A (ja) * 2017-01-06 2018-07-12 株式会社ノーリツ 暖房給湯装置

Also Published As

Publication number Publication date
ATE508333T1 (de) 2011-05-15
ITTO20040846A1 (it) 2005-03-01
EP1831609A1 (fr) 2007-09-12
WO2006059208A1 (fr) 2006-06-08
EP1831609B1 (fr) 2011-05-04
CA2588748A1 (fr) 2006-06-08
WO2006059208A8 (fr) 2006-10-26
DE602005027900D1 (de) 2011-06-16

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