EP1039236A2 - Storage boiler of the combined type - Google Patents
Storage boiler of the combined type Download PDFInfo
- Publication number
- EP1039236A2 EP1039236A2 EP00200973A EP00200973A EP1039236A2 EP 1039236 A2 EP1039236 A2 EP 1039236A2 EP 00200973 A EP00200973 A EP 00200973A EP 00200973 A EP00200973 A EP 00200973A EP 1039236 A2 EP1039236 A2 EP 1039236A2
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- EP
- European Patent Office
- Prior art keywords
- water
- heat exchanger
- hot
- unit
- sanitary water
- 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.)
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Classifications
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- 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
-
- 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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/08—Storage tanks
Definitions
- the second section 20b of the hydraulic circuit 20 for the circulation of sanitary water comprises a feeding duct 25 to the unit 5, extending between the duct 21 connected to the water mains and the unit 5, in which the duct 25 penetrates down to the lower portion of the reservoir 33 which houses the heat exchanger 19, and an outlet duct 26 from the unit 5 extending between said unit and the three-way diverter valve 27.
- the feeding ducts 23 and 25 to the secondary exchanger 4 and to the storage unit 5 are connected in a conventional way to the duct 21 which feeds sanitary water to the boiler 1.
- Mode b) is especially suitable in the periods of maximum delivery of hot sanitary water.
- the thermal energy and the flow rate of the hot water drawn from the storage unit 5 supplement those of the water leaving the secondary exchanger 4.
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- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Supercharger (AREA)
- Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
Abstract
A storage boiler (1) of the so-called combined type,
comprises a secondary heat exchanger (4) provided with
respective first thermal exchange means for heating
sanitary water supplied to said exchanger (4), a unit (5)
for producing and storing hot sanitary water provided with
respective second thermal exchange means (19) for heating
the sanitary water stored within said unit (5), and a
secondary hydraulic circuit (20) for the circulation of
sanitary water, provided with means (27) for selectively
drawing off the sanitary water heated by said secondary
heat exchanger (4) and/or by said unit (5) for producing
and storing hot sanitary water. The storing unit (5) is
arranged in the secondary hydraulic circuit (20) for the
circulation of sanitary water in parallel to the secondary
heat exchanger (4). In the boiler of the invention the
second thermal exchange means (19) provided in the unit (5)
for producing and storing hot sanitary water is essentially
in parallel to the first thermal exchange means, so that
heating of the unit (5) for producing and storing hot
sanitary water may be independently carried out with
respect to the secondary heat exchanger (4).
Description
The present invention relates to a storage boiler of the
so-called combined type, comprising:
- a secondary heat exchanger provided with respective first thermal exchange means for heating sanitary water supplied to said exchanger;
- a unit for producing and storing hot sanitary water provided with respective second thermal exchange means for heating the sanitary water stored within said unit;
- a secondary hydraulic circuit for the circulation of
sanitary water, provided with means for selectively drawing
off the sanitary water heated by said secondary heat
exchanger and/or by said unit for producing and storing hot
sanitary water;
wherein said unit for producing and storing hot sanitary water is arranged in said secondary hydraulic circuit in parallel to the secondary heat exchanger.
In the following description and in the following claims,
the expression 'boiler of the combined type' is used to
indicate a boiler adapted to generate both hot water for
space heating (primary water), and hot water for sanitary
use (sanitary water).
In the field of boilers for domestic use, and in
particular, of boilers of the combined type, the need is
increasingly felt of ensuring both a prompt delivery of hot
sanitary water at the desired temperature, and the
production of hot primary water for space heating. In order
to fulfil this need, the so-called storage boilers, wherein
a certain amount of readily-usable hot water is stored
within a storage unit and herein maintained at a
predetermined temperature so as to provide hot water for
sanitary use in relatively short times, have gained ground
in the field.
A kind of storage boilers of the combined type currently
available on the market essentially comprises a primary
heat exchanger- (usually, of the gas-water type) for
producing hot primary water for space heating, and a
secondary heat exchanger (usually, of the plate-and-frame
type) for instantaneously producing hot sanitary water,
this kind of boilers providing for the use, at each water
drawing-off by the users, of a predetermined amount of
readily-usable hot sanitary water previously heated in a
separate storage unit.
Thus, for example, German patent application DE 3714968
discloses a storage boiler of the combined type wherein a
single primary hydraulic circuit is provided for the
circulation of hot primary water, which puts in fluid
communication the primary heat exchanger with the secondary
heat exchanger, and thus, with the storage tank.
More particularly, the hot primary water leaving the
primary heat exchanger is sent to the external heating
plant or, alternatively, to the secondary heat exchanger
and, from here, to the storage tank which is thus arranged
in series with the preceding one. On the contrary, for the
circulation of sanitary water, a hydraulic circuit of
sanitary water is provided, comprising a first section for
supplying sanitary water to the secondary heat exchanger,
and a second section, extending in parallel to said first
section, for supplying sanitary water to the storage tank.
The sanitary water is heated in the secondary heat
exchanger and in the storage tank by means of a thermal
exchange with the primary water flowing in the primary
hydraulic circuit.
A significant drawback associated to the storage boilers of
this kind is related to the fact that the storage tank and
the secondary heat exchanger are in series with one another
in the primary hydraulic circuit; thus, heating sanitary
water in the storage tank inevitably implies the
circulation of hot primary water also in the secondary heat
exchanger thereby heating the sanitary water contained
therein, even when no hot sanitary water is drawn off (and
consequently, even when the secondary heat exchanger is not
in operation) but there is the need of restoring the
desired temperature of the hot water stored within the
storage tank.
This causes the undesired formation of limestone and
scaling in the fluid flowpath for the circulation of
sanitary water provided in the secondary heat exchanger.
Said scaling and limestone hinder the thermal exchange
between sanitary water and primary water, thus causing a
performance and efficiency reduction of the secondary
exchanger, which constantly worsen in a substantially
irreversible way in the course of time.
In fact, the performance and efficiency reduction related
to the formation of limestone and scaling in the fluid
flowpath for the circulation of sanitary water causes a
gradual but irreversible reduction of the flow rate which
may be delivered by the secondary exchanger at the maximum
design temperature of the latter or, in the alternative, it
allows to deliver the maximum design flow rate but at a
temperature which is increasingly lower than the maximum
temperature reachable when the secondary heat exchanger is
new.
Moreover, the presence of limestone and scaling in the
fluid flowpath for the circulation of sanitary water in the
secondary exchanger of the boiler inevitably involves an
increase in the operating and maintenance costs of the
boiler itself, up to the need of replacing the secondary
exchanger with the consequent costs.
The technical problem underlying the present invention is
that of providing a storage boiler of the combined type
which allows to ensure a prompt delivery of hot sanitary
water, overcoming at the same time the above-mentioned
drawbacks of the prior art.
This problem is solved according to the invention by a
storage boiler of the combined type of the kind described
above, which is characterised in that the second thermal
exchange means provided in the unit for producing and
storing hot sanitary water is essentially in parallel with
the first thermal exchange means provided in the secondary
heat exchanger.
According to the invention, it is possible in this way to
heat the sanitary water stored within the production and
storage unit without having to necessarily heat also the
sanitary water present in the secondary heat exchanger,
thus advantageously avoiding the aforementioned drawbacks
related to the formation of limestone and scaling in the
secondary heat exchanger.
Additional features and advantages of the present invention
will be more readily apparent from the following detailed
description of a preferred embodiment, given by way of
illustration and not of limitation with reference to the
attached drawing, which shows a simplified hydraulic
circuit of the boiler according to the invention.
In figure 1, a storage boiler of the combined type
according to a preferred embodiment of the present
invention is generally and schematically indicated at 1.
The boiler 1 comprises a gas-water heat exchanger 2,
preferably including a condensation section, adapted to
produce hot primary water for space heating (herein
referred to as primary exchanger).
The primary exchanger 2 is in fluid communication, by means
of a first hydraulic circuit of hot primary water globally
indicated at 3, with an external plant for space heating
(not shown) and with a heat exchanger 4, generally of the
plate-and-frame type, adapted to produce hot sanitary water
(herein referred to as secondary exchanger).
In a way known per se, the secondary exchanger 4 is
provided with respective thermal exchange means, such as
for example a fluid flowpath of hot primary water defined
in a plurality of hollow spaces formed in the body of the
exchanger, which are intended to heat the cold sanitary
water coming from the water mains. To this end, the first
thermal exchange means provided in the secondary exchanger
4 is associated to the first hydraulic circuit 3 for the
circulation of hot primary water to and from the primary
heat exchanger 2.
Two flowpaths of primary water in parallel with one another
and respectively indicated at 3a and 3b are defined in the
first hydraulic circuit 3.
A first flowpath 3a is intended to connect the primary
exchanger 2 to the external heating plant and comprises a
delivery duct 7 to the primary exchanger 2; an outlet duct
8 from the primary exchanger 2, a first three-way diverter
valve 9 and a delivery duct 10 to the external heating
plant. The aforementioned delivery ducts 7 and 10 to the
primary exchanger 2 and to the external heating plant are
connected to respective ducts (not shown) of the heating
plant by means of a pair of conventional fittings, not
shown in the figure.
A second flowpath 3b connects the primary exchanger 2 to
the secondary exchanger 4 and comprises the delivery duct 7
to the primary exchanger 2, the outlet duct 8 from the
primary exchanger 2, the first diverter valve 9, a
connecting duct 11, a second three-way diverter valve 12,
inlet and, respectively, feeding and delivery ducts 13 and
14 to and from the secondary exchanger 4, and a first
return line 15 to the primary exchanger 2.
The boiler 1 of the invention also comprises a unit 5 for
producing and storing hot sanitary water capable to produce
and store readily-usable hot sanitary water having a
predetermined temperature.
The unit 5 is essentially constituted by a reservoir 33
having an elongated shape with a substantially vertical
extension and is provided with respective thermal exchange
means adapted to heat the cold sanitary water coming from
the water mains.
In a preferred embodiment, these thermal exchange means are
constituted by a heat exchanger 19, comprising a coil 19a,
housed in the lower portion of the reservoir 33 and adapted
to carry out a thermal exchange between the hot primary
water flowing in the coil and the sanitary water stored
within the unit 5.
According to a preferred embodiment of the present
invention, shown in figure 1, the heat exchanger 19
provided in unit 5 for producing and storing hot sanitary
water is in fluid communication with the primary exchanger
2, with respect to which it is structurally independent, by
means of a second hydraulic circuit 6 for the circulation
of hot primary water from and to the primary heat exchanger
2 and extending in parallel to the first hydraulic circuit
3 of hot primary water described above.
Said second hydraulic circuit 6 connects the primary
exchanger 2 to the unit 5 for producing and storing hot
water by means of the delivery duct 7 to the primary
exchanger 2, of the outlet duct 8 from the primary
exchanger 2, of the first diverter valve 9, of the duct 11,
of the second diverter valve 12, of a feeding duct 16 to
the unit 5 and of a second return line 17 to the primary
exchanger 2.
In a conventional way, the heat exchanger 19 is connected
to the ducts 16 and 17 of the second hydraulic circuit 6 of
hot primary water by means of respective pipe fittings, not
shown.
The return lines 15 and 17 to the primary exchanger 2 from
the secondary exchanger 4 and from the storage unit 5 are
connected to the delivery duct 7 to the primary exchanger 2
in a known way, so as to define respective loop-closed
flowpaths.
The circulation of primary water in the parallel hydraulic
circuits 3 and 6 is promoted by a circulation pump 18
arranged in the delivery duct 7 upstream of the primary
exchanger 2.
The primary water flow is directed towards the fluid
flowpaths 3a and/or 3b of the first hydraulic circuit 3 by
means of the first valve 9, and towards the flowpath 3b
and/or the second hydraulic circuit 6 by means of the
second valve 12. In particular, the first valve 9
intercepts the hot primary water flowing in the outlet duct
8 from the primary exchanger 2 and directs the same towards
the delivery duct 10 to the external heating plant and/or
to the connecting duct 11. The second valve 12 is arranged
downstream of the first valve 9 and intercepts the hot
primary water flowing in the connecting duct 11, directing
the same towards the feeding duct 13 to the secondary
exchanger 4 and/or to the feeding duct 16 to the unit 5 for
producing and storing hot water.
According to a preferred embodiment, the first diverter
valve 9 is a three-way mixing valve, i.e. a valve capable
of directing the hot primary water coming from the primary
exchanger partly towards the external heating plant and
partly towards the storage unit 5.
Thus, in the embodiment shown in figure 1, the sanitary
water is heated in the secondary exchanger 4 and in the
storage unit 5 by means of thermal exchange with the hot
primary water respectively circulating in the first circuit
3 and in the second circuit 6 of hot primary water.
According to an alternative embodiment, not shown, the heat
exchanger 19 provided in the unit 5 for producing and
storing hot sanitary water may be in fluid communication
with the condensation section of the primary exchanger 2,
with respect to which the heat exchanger 19 is structurally
independent, the hydraulic circuit 6 being in this case
connected to said section in parallel to the first
hydraulic circuit 3 of hot primary water described above by
means of suitable ducts, fittings and valve means.
In this embodiment, the sanitary water stored within the
reservoir 33 may be heated essentially by the condensation
section of the primary exchanger 2, whereas its main
section is primarily used for providing heat to the heating
plant and/or to the secondary exchanger 4.
According to a further alternative embodiment, also not
shown, the thermal-exchange means provided in the unit 5
for producing and storing hot sanitary water may be
constituted by a resistor for heating the sanitary water
stored therein, or by any other heating means independent
of the hydraulic circuit 3 of primary water and, as such,
parallel to the same.
The sanitary water circulates in a hydraulic circuit for
sanitary water, globally indicated at 20, comprising a
first and a second section 20a, 20b, extending in parallel
between a feeding duct 21 for supplying main sanitary water
to the boiler 1 and a duct 22 for delivering hot sanitary
water.
The first section 20a of the hydraulic circuit 20 for the
circulation of sanitary water comprises a feeding duct 23
to the secondary exchanger 4, extending between the duct 21
for the fluid connection to the water mains and the
secondary exchanger 4, a fluid flowpath on the sanitary
water side (not shown) defined in the secondary exchanger 4
and an outlet duct 24 from the secondary exchanger 4,
extending between the latter and suitable means for
selectively drawing off sanitary water heated by the
secondary exchanger 4 and/or by the unit 5 for producing
and storing hot sanitary water.
In a preferred embodiment of the present invention, said
means is essentially constituted by a three-way diverter
valve 27 mounted upstream of the delivery duct 22 of the
heated hot sanitary water.
The second section 20b of the hydraulic circuit 20 for the
circulation of sanitary water comprises a feeding duct 25
to the unit 5, extending between the duct 21 connected to
the water mains and the unit 5, in which the duct 25
penetrates down to the lower portion of the reservoir 33
which houses the heat exchanger 19, and an outlet duct 26
from the unit 5 extending between said unit and the three-way
diverter valve 27.
The feeding ducts 23 and 25 to the secondary exchanger 4
and to the storage unit 5 are connected in a conventional
way to the duct 21 which feeds sanitary water to the boiler
1.
In a preferred embodiment of the present invention, the
three-way valve 27 is a mixing valve, which is capable of
both selectively drawing off the sanitary water heated by
the secondary exchanger 4 or by the unit 5 for producing
and storing hot sanitary water and of simultaneously
drawing off the sanitary water heated by the exchanger 4
and by the unit 5 also suitably mixing the water drawn as a
function of the temperature desired by the user.
In order to ensure a regular operation and the desired
temperature regulation of the delivered sanitary water, the
boiler 1 also comprises temperature sensors 28, 29 and 30
respectively arranged on the outlet duct 8 from the primary
exchanger 2, on the outlet duct 29 from the storage unit 5
and on the duct 22 for delivering hot sanitary water. A
thermostat 31 is arranged in the storage unit 5 so as to
allow to maintain the hot sanitary water stored therein at
the desired temperature.
In addition, a flow sensor 32 is arranged in the duct 21
which feeds sanitary water to the boiler 1.
The operation of the boiler of the invention, illustrated
with reference to the preferred embodiment of figure 1, is
the following.
In the absence of any drawing-off of hot sanitary water and
of any reset of the storage unit 5 and thus, in space-heating
mode only, the pump 18 promotes the circulation of
primary water in the flowpath 3a of the first hydraulic
circuit 3. The primary water circulates from the duct 7 to
the duct 8 through the primary exchanger 2, wherein it is
heated by the hot combustion gases circulating into the
same exchanger 2. In this operating mode, the three-way
mixing valve 9 closes the duct 11, thus sending the hot
primary water towards the delivery duct 10 to the external
heating plant. The temperature of the hot primary water
produced by the primary exchanger 2 is detected by a sensor
28, arranged in the outlet duct 8 from the exchanger 2,
which regulates the operation of the primary exchanger 2 so
as to have the hot primary water at the desired
temperature.
In the reset mode of the storage unit 5, the pump 18
promotes the circulation of primary water in the second
hydraulic circuit 6 of hot primary water. In this case, the
primary water circulates from the primary exchanger 2
towards the duct 11 by means of the valve 9. The diverter
valve 12 closes the feeding duct 13 to the secondary
exchanger 4 and directs the hot primary water only towards
the feeding duct 16 of the unit 5 for storing hot sanitary
water, and thus, into the exchanger 19, wherein it releases
part of its thermal energy to the sanitary water stored
within the unit 5. Then, the primary water continues
towards the return line 17 to the primary exchanger 2
wherein the same is heated again.
In the absence of any drawing-off of sanitary water, the
temperature of the sanitary water stored within the unit 8
is maintained at a constant value thanks to the
intervention of thermostat 31.
The presence of the mixing valve 9 instead of a simple
diverter valve makes it possible to carry out the reset of
the unit 5 without interrupting the thermal service to the
heating plant, but only reducing the same for the time
strictly necessary to reset the unit 5. This is
particularly advantageous if the heating plant operates
with a reduced load factor, that is, only uses a minor
fraction of the nominal power of the boiler, whereby an
interruption in the heating service may cause an undesired
fall of the temperature of the heating bodies (and in the
long run, also that of the heated space), with a consequent
protraction of the time required for restoring the heating
plant to its steady operating temperature.
Advantageously, in the boiler of the invention the heating
of sanitary water does not involve the secondary exchanger
4, thus preventing that the latter could be affected by the
problems related to the formation of limestone in still-water
conditions.
In the mode of hot sanitary water drawing-off, the three-way
mixing valve 9 closes the delivery duct 10 to the
external heating plant and directs the hot primary water
towards the duct 11, whereas the valve 12 closes the
feeding duct 16 to the unit 5 for storing hot sanitary
water and sends the hot primary water only towards the
secondary exchanger 4 by means of the duct 13.
In this case, the hot primary water releases part of its
thermal energy to the sanitary water drawn from the water
mains through the duct 23, and then continues towards the
return line 15 to the primary exchanger 2, wherein it is
heated again.
The selection of a determined flowpath for the sanitary
water and for the primary water is controlled in a known
way by an electronic control unit of the boiler (not shown)
and it occurs, for example, when the flow sensor 32 detects
a drawing-off of sanitary water in the duct 21 which feeds
sanitary water to the boiler 1.
The boiler of the present invention advantageously allows
to deliver hot sanitary water at the temperature and flow
rate desired by the user thanks to the possibility of
drawing off from the secondary exchanger 4 and/or from the
storage unit 5.
In fact, when the sensor 30 arranged on the duct 22 for
delivering hot sanitary water detects a temperature of the
sanitary water lower than the desired one, the mixing valve
27 opens the duct 26 so as to draw off hot water also from
the unit 5, capable of promptly providing hot water at high
temperature.
Thus, the boiler of the present invention allows to produce
in operation hot sanitary water according to three
different operating modes, which may be preselected by the
user as a function of the desired flow rate of hot sanitary
water:
Mode a) is especially suitable in periods of scarce use of
hot water, such as for example, in the summertime. In this
case, the sanitary water stored within the unit 5 is not
heated, thus limiting both the formation of limestone
inside said unit and the heat losses towards the external
environment, with an advantageous increase of the global
efficiency of the boiler. In addition, it is possible to
regulate the temperature of the delivered hot sanitary
water by drawing off a small quantity of cold water from
the reservoir 33 by means of the valve 27 driven by the
electronic control unit of the boiler 1. Among the other
things, this allows a continuous replacement of the water
stored within the unit 5, thus reducing the proliferation
of potentially dangerous micro-organisms in the stored
still water.
Mode b) is especially suitable in the periods of maximum
delivery of hot sanitary water. In this case, the thermal
energy and the flow rate of the hot water drawn from the
storage unit 5 supplement those of the water leaving the
secondary exchanger 4.
Mode c) is suitable for intermediate situations with
respect to the aforementioned cases. In this mode, the hot
sanitary water is drawn off only from the storage unit 5,
without involving the secondary exchanger 4, al least until
the energy content in the storage unit 5 is fully exploited
(said energy content is detected by the temperature sensor
29 arranged on the outlet duct 26 from the storage unit 5).
Thus, in these conditions it is possible to deliver hot
sanitary water without interrupting the thermal service to
the heating plant.
Finally, it is to be added that in the modes of sanitary
water delivery in which the storage unit 5 is involved, it
is possible to exploit to the fullest extent the heat
accumulated in the hot sanitary water stored within the
reservoir 33, which may be gradually fully replaced by cold
water coming from the mains, thanks to the advantageous
effect of water stratification allowed by the extension of
the same reservoir in a prevalently vertical direction.
Once the water (and heat) has been drawn from unit 5, said
cold water can be heated at the predetermined storing
temperature in one of the ways described hereinabove.
Claims (14)
- Storage boiler (1) of the combined type, comprising:a secondary heat exchanger (4) provided with respective first thermal exchange means for heating sanitary water supplied to said exchanger;a unit (5) for producing and storing hot sanitary water provided with respective second thermal exchange means for heating the sanitary water stored within said unit (5);a secondary hydraulic circuit (20) for the circulation of sanitary water, provided with means (27) for selectively drawing off the sanitary water heated by said secondary heat exchanger (4) and/or by said unit (5) for producing and storing hot sanitary water;
wherein said unit (5) for producing and storing hot sanitary water is arranged in said secondary hydraulic circuit (20) in parallel to the secondary heat exchanger (4);
characterised in that the second thermal exchange means provided in the unit (5) for producing and storing hot sanitary water is essentially in parallel to the first thermal exchange means provided in the secondary heat exchanger (4). - Boiler (1) according to claim 1, further comprising a primary heat exchanger (2) for producing hot primary water for space heating and wherein the first thermal exchange means provided in the secondary heat exchanger (4) are associated to a first hydraulic circuit (3) for the circulation of hot primary water to and from said primary heat exchanger (2).
- Boiler (1) according to claim 2, wherein the second thermal exchange means provided in the unit (5) for producing and storing hot sanitary water are associated to a second hydraulic circuit (6) of hot primary water for the circulation of hot primary water to and from said primary heat exchanger (2) and extending in parallel to the first hydraulic circuit (3) of hot primary water.
- Boiler (1) according to claim 2, wherein said unit (5) for producing and storing hot sanitary water is structurally independent from the primary heat exchanger (2) and said second thermal exchange means comprises a resistor.
- Boiler (1) according to claim 2, characterised in that it comprises first valve means (9) for intercepting the hot primary water, arranged in said first hydraulic circuit (3) of hot primary water between the primary heat exchanger (2) and the secondary heat exchanger (4) for selectively diverting the hot primary water towards said secondary heat exchanger (4) and/or towards a heating plant external to boiler (1).
- Boiler (1) according to claim 3, characterised in that it comprises second valve means (12) for intercepting the hot primary water, arranged in said second hydraulic circuit (6) of hot primary water between the primary heat exchanger (2) and the unit (5) for producing and storing hot sanitary water, for selectively diverting the hot primary water towards said secondary heat exchanger (4) and/or towards said unit (5).
- Boiler (1) according to claims 5 and 6, wherein said second valve means (12) for intercepting the hot primary water is arranged downstream of said first valve means (9) for intercepting the hot primary water, between the first (3) and the second (6) hydraulic circuit of hot primary water.
- Boiler (1) according to claims 5 and 6, wherein said first (9) and second (12) valve means for intercepting the hot primary water comprise a three-way diverting valve.
- Boiler (1) according to claim 5, wherein said first valve means (9) for intercepting the hot primary water comprises a three-way mixing valve.
- Boiler (1) according to claim 2, wherein the primary heat exchanger (2) is a gas-water exchanger comprising a condensation section and wherein the second thermal exchange means provided in the unit (5) for producing and storing hot sanitary water is associated to a second hydraulic circuit (6) of hot primary water for the circulation of hot primary water to and from the condensation section of the primary heat exchanger (2) and extending in parallel to the first hydraulic circuit (3) of hot primary water.
- Boiler (1) according to claims 3 or 10, wherein the unit (5) for producing and storing hot sanitary water comprises a reservoir (33) and wherein the second thermal exchange means provided in said unit (5) comprises a third heat exchanger (19) in fluid communication with said second circuit (6) of hot primary water.
- Boiler (1) according to claim 11, wherein the reservoir (33) has an elongated shape with a substantially vertical extension, and said third heat exchanger (19) is housed in the lower portion of said reservoir (33).
- Boiler (1) according to claim 1, wherein the secondary hydraulic circuit (20) for the circulation of sanitary water comprises:a first section (20a) comprising a first duct (23) extending between a pipe fitting for fluid connection to the water mains and said secondary heat exchanger (4), a fluid flowpath on a sanitary water side defined in the secondary heat exchanger (4) and a second hot sanitary water delivery duct (24) extending between the secondary heat exchanger (4) and said means (27) for selectively drawing off the sanitary water heated by said secondary heat exchanger (4) and/or by said unit (5) for producing and storing hot sanitary water,a second section (20b) comprising a third duct (25) extending between said pipe fitting for fluid connection to the water mains and the unit (5) for producing and storing hot sanitary water, a storage area defined in said unit (5) and a fourth duct (26) extending between said unit (5) and the means (27) for selectively drawing off the sanitary water heated by the secondary heat exchanger (4) and/or by said unit (5) for producing and storing hot sanitary water.
- Boiler (1) according to claims 1 or 13, characterised in that the means (27) for selectively drawing off sanitary water from the secondary heat exchanger (4) and/or from said unit (5) for producing and storing hot sanitary water comprises a three-way mixing valve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI990596 | 1999-03-23 | ||
| IT1999MI000596A IT1311765B1 (en) | 1999-03-23 | 1999-03-23 | COMBINED TYPE ACCUMULATION BOILER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1039236A2 true EP1039236A2 (en) | 2000-09-27 |
| EP1039236A3 EP1039236A3 (en) | 2000-11-08 |
Family
ID=11382412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00200973A Withdrawn EP1039236A3 (en) | 1999-03-23 | 2000-03-17 | Storage boiler of the combined type |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1039236A3 (en) |
| IT (1) | IT1311765B1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006051259A1 (en) | 2004-11-12 | 2006-05-18 | Zenex Technologies Limited | System for delivering warmed fluids |
| WO2006051266A1 (en) | 2004-11-12 | 2006-05-18 | Zenex Technologies Limited | Heat exchanger suitable for a boiler, and a boiler including such a heat exchanger |
| US8910880B2 (en) | 2005-11-01 | 2014-12-16 | Zenex Technologies Limited | Heating system |
| RU2641489C2 (en) * | 2015-12-15 | 2018-01-17 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Забайкальский государственный университет" (ФГБОУ ВО "ЗабГУ") | Central thermal item of closed heat supply system |
| WO2018137726A1 (en) * | 2017-01-27 | 2018-08-02 | Almeva Ag | A combined system of service water heating and a heating medium for domestic heating |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU55777A1 (en) * | 1967-04-14 | 1968-06-16 | ||
| FR2551187B1 (en) * | 1983-08-26 | 1988-02-12 | Laurent Francois | PROCESS AND PLANT FOR THE PRODUCTION OF DOMESTIC HOT WATER FROM A BURNER HEAT GENERATING PLANT |
| FR2557274A1 (en) * | 1983-12-27 | 1985-06-28 | Deboffles Regis | Installation for heating and production of hot water. |
-
1999
- 1999-03-23 IT IT1999MI000596A patent/IT1311765B1/en active
-
2000
- 2000-03-17 EP EP00200973A patent/EP1039236A3/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006051259A1 (en) | 2004-11-12 | 2006-05-18 | Zenex Technologies Limited | System for delivering warmed fluids |
| WO2006051266A1 (en) | 2004-11-12 | 2006-05-18 | Zenex Technologies Limited | Heat exchanger suitable for a boiler, and a boiler including such a heat exchanger |
| US7415944B2 (en) | 2004-11-12 | 2008-08-26 | Christopher Charles Farrell | Heat exchanger suitable for a boiler, and a boiler including such a heat exchanger |
| US8480004B2 (en) | 2004-11-12 | 2013-07-09 | Zenex Technologies Limited | System for delivering warmed fluids |
| US8910880B2 (en) | 2005-11-01 | 2014-12-16 | Zenex Technologies Limited | Heating system |
| RU2641489C2 (en) * | 2015-12-15 | 2018-01-17 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Забайкальский государственный университет" (ФГБОУ ВО "ЗабГУ") | Central thermal item of closed heat supply system |
| WO2018137726A1 (en) * | 2017-01-27 | 2018-08-02 | Almeva Ag | A combined system of service water heating and a heating medium for domestic heating |
| AT16648U1 (en) * | 2017-01-27 | 2020-04-15 | Almeva Ag | Combined system consisting of domestic water heating and a heating medium for home heating |
| RU198390U1 (en) * | 2017-01-27 | 2020-07-02 | Альмева Аг | COMBINED DEVICE FOR HEATING TECHNICAL WATER AND HEAT CARRIER FOR HEATING RESIDENTIAL PREMISES |
| EE01530U1 (en) * | 2017-01-27 | 2021-04-15 | Almeva Ag | A combined system of service water heating and a heating medium for domestic heating |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1039236A3 (en) | 2000-11-08 |
| IT1311765B1 (en) | 2002-03-19 |
| ITMI990596A1 (en) | 2000-09-23 |
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