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EP 3 397 913 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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09.10.2019 Bulletin 2019/41 |
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Date of filing: 22.12.2016 |
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International Patent Classification (IPC):
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International application number: |
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PCT/PL2016/000154 |
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International publication number: |
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WO 2017/116251 (06.07.2017 Gazette 2017/27) |
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HEAT EXCHANGE DEVICE
WÄRMETAUSCHERVORRICHTUNG
DISPOSITIF D'ÉCHANGE DE CHALEUR
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Designated Contracting States: |
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AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
NO PL PT RO RS SE SI SK SM TR |
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Priority: |
31.12.2015 PL 41568415
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Date of publication of application: |
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07.11.2018 Bulletin 2018/45 |
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Proprietor: AIC S.A. |
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81-577 Gydnia (PL) |
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Inventor: |
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- SZCZEPANSKI, Krzysztof
83-110 Tczew (PL)
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Representative: Kwapich, Anna |
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Kancelaria Patentowa
Ul. Marusarzowny 4/69 80-288 Gdansk 80-288 Gdansk (PL) |
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References cited: :
WO-A1-2013/113308 US-A1- 2007 079 630
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US-A- 5 901 563 US-A1- 2015 007 594
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The invention concerns a heat exchange device intended for systems which require
heat exchange between two different agents circulating in two different circuits,
in particular when a heating agent circulates in one of the circuits, and a cooling
agent undergoing change of state circulates in the other circuit. In particular, the
device can be used as a condenser in hydraulic heat pump modules, heating systems,
or cooling systems.
[0002] Known are many different heat exchange devices and installations which include heat
exchangers of various structures aligned to the specific designation and the desired
heat exchange parameters, and to the agents which flow in them. There are several
condenser categories known among the heat exchangers which are used as condensers,
especially in heat pump systems. These may be plate condensers consisting of plates
which form separate spaces where the agents exchanging heat with the plates flow.
Also known are coat and tube condensers where the tubes run between strips of metal
sheet. Another category groups condensers consisting of two coaxial tubes (outer and
inner), coiled into spirals. Known, too, are devices having a tank filled with one
heat exchange agent and a spiral tube coil filled with the other heat exchange agent
placed inside the tank.
[0003] Known from patent publication
EP1103775 is a heat exchanger to be used in water heating systems. The exchanger has a central
inner flow duct delimited by the first wall, and an outer flow duct delimited by the
second wall, and is designated for the flow of two media. The two flow ducts form
a spiral designated especially for being placed inside a hot water tank. Disclosed
in the publication are different shapes of the walls delimiting the flow ducts, intended
to maximise the speed of heat transfer from the outer flow duct to the area around
it and to intensify heat exchange between the flow ducts.
[0004] Disclosed in the publication of international patent application
WO2015/107970 is a tube structure which enables the heat exchanger to have a compact construction.
It consists of an outer tube and multiple inner tubes inserted through the outer tube
so that the axes of the inner tubes are arranged with an equal distance one to the
other in a cross section perpendicular to the axes. The outer tube is fitted with
the first coil fixed on its inner circumferential surface, and the multiple inner
tubes are fitted with other coils fixed on their inner circumferential surfaces. The
first flow duct is defined by the inside of the outer tube and the outsides of the
inner tubes, and the second flow duct is defined by the total area of the cross sections
of the inner tubes. The ratio of the area of cross sections of the first and second
flow ducts falls within the range between 1:2 and 2:1.
[0005] Known from patent description
EP 1965164 is an installation incorporating a heat exchange device provided with a tank containing
a heating agent, where the tank has an agent inlet in its bottom part and an agent
outlet in its top part, and where there is an exchanger in the tank in the form of
two coaxial tubes immersed in the heating agent. The bottom end of the inner tube
designated to accommodate the heating agent is connected to the heating agent inlet,
and the other end of the tube opens into the tank in its middle part. The inlet and
outlet of the outer tube is connected to the circuit in which the cooling agent circulates.
The solution envisages different variants of the number of coaxial exchangers in the
tank, their connections, and the positions of the tube inlets and outlets. Also known
from European patent description
EP 2080975 is a modified device disclosed in publication
EP 1965164 in which the innertube, in its length between the inlet of the heating agent to the
tank and the coaxial tube exchanger, is uncovered by the outer tube in which at least
one outlet opening is arranged. The size of the opening is adjusted so as to ensure
that the flow rate of the heating agent flowing out of the tank falls within the range
of 20-60% of the flow rate of the heating agent supplied through the inlet. The publication
discloses preferable dimensions of the inner tube and the outflow opening.
[0006] Disclosed in the international patent application published under No.
WO2007/090861 is a heat exchange device comprising a coil consisting of two coaxial tubes and placed
in a tank having an outlet and an inlet. The outer tube is designated for the first
heat exchange fluid, and the inner tube for the second heat exchange fluid which fills
also the tank. The outlet of the tank from which the second fluid is collected is
coupled directly to one end of the inner tube, and its inlet for the second fluid
opens freely into the tank. The inlet and outlet of the outer tube are connected to
the circuit of the first fluid. The publication discloses different variants of positioning
the inlets and outlets of the tank and the inner tube, the shape of the coil, the
directions of the flow of the two fluids in the tubes and the tank, and the shapes
of the tubes and connection stub pipes.
[0007] WO-A-2013113308 discloses a heat exchange device according to the preamble of claim 1.
[0008] The heat exchange device according to the invention, has a coil heat exchanger with
inlets and outlets for the heat exchanging agents and a tank for one of the agents,
where the tank is provided with an inlet and outlet stub pipes wherein the coil heat
exchanger consists of at least one coil wound spirally around the tank on its outside.
The coil takes the form of three coaxial tubes, where the outer and inner tubes serve
as the first flow ducts for the first agent, and the central tube serves as the second
flow duct for the second agent. At the first end of the coil its outer and inner tubes
are connected by way of the first collector to the inlet stub pipe for the supply
of the first agent, and the central tube is connected by way of the second collector
to the outlet of the second agent, while at the other end of the coil its outer tube
and inner tube are connected with the inside of the tank by way of the third collector
and a supply stub pipe, and the central tube is connected to the inlet of the second
agent by way of the fourth collector and a supply tube.
[0009] The first end of the coil with the first and second collectors, the inlet stub pipe
for the supply of the first agent and outlet of the second agent are placed in the
bottom part of the tank, and the second end of the coil with the third and fourth
collectors and the supply stub pipe are placed in the top part of the tank.
[0010] Preferably, the second collector is placed inside the first collector, and the fourth
collector is placed inside the third collector.
[0011] The second agent inlet is located in the bottom part of the tank, and the supply
pipe runs vertically along the outer wall of the tank.
[0012] Preferably, at the inlet to the fourth collector the supply pipe ends with an elbow
in the shape of reversed letter U.
[0013] In one of the variants of the device there are at least two coils wound around the
tank on its outside, where the subsequent turns of the coils are arranged alternatingly
and the ends of all coils are inserted in the shared collectors: the first, second,
or third collector, respectively.
[0014] In a preferable embodiment variant, the subsequent turns of the coils contact one
another tightly, without any free space left in between.
[0015] The coaxial tubes of the exchanger are fitted with distancing elements.
[0016] In one of the variants the outer tube and central tube have indentations on their
outer surfaces, where the depth of the indentations ensures the required distance
between the tubes.
[0017] In another variant the outer tube and the central tube have spiral notches on their
outside surfaces, where the depth of the notches ensures the required distance between
the tubes.
[0018] In another variant of the device the inner tube and the central tube are provided
with distancing wires wound spirally around them on the outside, where the diameter
of the wires ensures the required distance between the tubes.
[0019] Most preferably the ratio between the diameters of the coaxial tubes of the coil
falls within the range from 1:1.05:1.1 to 1:3:6.
[0020] The solution according to the invention ensures higher efficiency and effectiveness
of heat transfer between two different agents circulating in two circuits in a heat
exchange device without enlarging the device itself.
[0021] An exemplary embodiment of the heat exchange device is shown on a drawing where Fig.
1 depicts the device in partial section, Fig. 2 presents a diagram of the agents'
flow in the tubes of the exchanger, and Fig. 3 a, b, c shows schematically three variants
of achieving the distance between the tubes.
[0022] The heat exchange device in the exemplary embodiment shown on Fig. 1 is in particular
intended to work as a condenser, in e.g. heat pump systems, and serves heat exchange
between the first agent and second agent circulating in the first and second circuits,
respectively, where water is used as the first agent, and a Freon refrigerant as the
second agent. The device consists of a closed vertical tank 1 with a spiral heat exchanger
coiled around it on the outside, where the exchanger consists of two identical coils
2A and 2B. The subsequent turns of coils 2A, 2B are arranged alternatingly and contact
one another tightly without any free space left in between. The first ends of the
two coils are placed in the bottom part of the tank 1, and their opposite ends in
the top part of the tank 1. Each of the coils 2A, 2B is formed of three coaxial tubes
inserted one into another with some distance left between their walls. The outer tube
3 and inner tube 4 in each coil are intended for the flow of the first heat exchange
agent, i.e. water serving as the heating agent accumulated in the tank 1 and collected
from the tank to be supplied to the heating devices, while the central tube 5 of each
coil serves as the flow duct for the other heat exchange agent, i.e. Freon refrigerant.
The bottom ends of the outer tubes 3 and inner tubes 4 in both coils are inserted
in the first shared collector 6 connected to the inlet stub pipe 7 through which the
water which needs to be heated flows into the device. The bottom ends of the central
tubes 5 of both coils are inserted in the second shared collector 8 connected to the
outlet 9 of the second agent, i.e. the refrigerant, where the second collector 8 is
placed inside the first collector 6. The top ends of the outer tubes 3 and inner tubes
4 of both coils are inserted in the third shared collector 10 which is connected with
the inside of the tank 1 via the supply stub pipe 11. The top ends of the central
tubes 5 of both coils are inserted in the fourth collector 12 which is placed inside
the third collector 10. The inside of the fourth collector 12 is connected with the
inlet 14 of the second agent via the supply pipe 13, where the inlet 14 is positioned
below the tank 1. The supply pipe 13 runs vertically inside the tank 1, and in its
top section is shaped into reversed letter U to form an elbow 15 above the inlet to
the fourth collector 12. In its bottom part, the tank 1 is fitted with the outlet
stub pipe 16 through which the heated water is drawn from the tank 1 and supplied
to the outer circuit feeding the heating devices. In addition, the tank 1 may be fitted
with an electric heating coil 17. So as to ensure an appropriate distance between
the three coaxial tubes in the process of coiling them to form spirals it is preferable
to use appropriate distancing elements. In the first variant, presented on Fig. 3a,
there are indentations 18 formed on the outside of the outer tube 3 and the inner
tube 4, where the depth of the indentations ensures the required distance between
the tubes in the bending process. In the second variant, there are wires 19 wound
spirally around the inner tube 4 and the central tube 5, as shown on Fig. 3c, where
the diameter of the wires ensures the appropriate distance between the tubes in the
bending process. The third variant, shown on Fig. 3b, envisages spiral notches 20
made on the outer tube 3 and the central tube 5, where the depth of the notches is
determined by the desired distance between the tubes.
[0023] The first agent, i.e. water, which transferred its heat in the outer heating devices,
is supplied to the first collector 6 through the inlet stub pipe 7, from where it
is distributed to the outer and inner tubes 3, 4 of both coils 2A, 2B and then flows
up the exchanger in the first two flow ducts K1 in each of the coils, i.e. between
the walls of the outer tube 3 and the central tube 5, as well as inside the inner
tubes 4. While flowing, the water takes heat from the second agent, the Freon refrigerant,
which is supplied in the form of gas from the inlet 14, via the vertical supply pipe
13 with the elbow 15, up to the fourth collector 12 at the top of the tank 1, from
where it is distributed to the central tubes 5 of the two coils 2A, 2B, inside which
it flows down in the second flow ducts K2 in the direction opposite to the direction
in which the first agent, i.e. water, flows, as shown schematically on Fig. 2. When
the water is receiving heat, the Freon refrigerant changes its state from gas to liquid,
i.e. gets condensed, and flows down the two coils to the second collector 8, from
where it is discharged to the outlet 9. The water heated when flowing up inside the
outer and inner tubes 3,4 of the two coils 2A, 2B flows into the third shared collector
10, from where it flows into the tank 1 via the supply stub pipe 11, and from the
tank it is drawn via the outlet stub pipe 16. The elbow 15 which ends the vertical
supply pipe 13 prevents any undesired oil impurities from getting to the fourth collector
12 and the exchanger tubes from the circuit of the second agent - the impurities flow
down and can then be discharged.
[0024] In its different embodiments, the device is preferably made of stainless steel, the
capacity of the tank ranges from 20 to 500 litres, and the ratio between the tube
diameters preferably falls within the range between 1:1.05:1.1 and 1:3:6. In the exemplary
embodiment the diameter of the outer tube 3 is 25 mm, its wall 1 mm thick, the diameter
of the central tube 5 is 18 mm, the wall 1 mm thick, and the diameter of the inner
tube 4 is 12 mm, the wall 0.6 mm thick.
[0025] The solution according to the invention ensures more effective heat exchange than
in the solutions known to date, in both heat exchangers in the form of a coil, and
heat exchange devices incorporating spiral heat exchangers placed in a tank, because
the heat is transferred between the first and second agents through the two walls
of the second flow duct K2 of the second agent, Freon refrigerant in particular, i.e.
through the wall of the inner tube 4 and the wall of the central tube 5, on both sides
of which the first agent, water in particular, flows in the first flow ducts K1 in
forced countercurrent.
[0026] In the devices of the type it is necessary to force the flow, especially with a compressor,
which may lead to mixing of oil and gas used as the coolant, as well as undesirable
transfer of the mixture into the exchanger tubes. The shape of the elbow element and
the point where the tube supplying the Freon refrigerant is connected to the spiral
exchanger, as used in the solution, prevents the phenomenon by facilitating the discharge
of undesired oil which cannot get into the exchanger through the elbow. In addition,
placing the spiral exchanger outside the tank and the inlet and outlet stub pipes
of both agents at the bottom of the tank facilitates its assembly and maintenance
in the systems in which it is installed.
[0027] The presented exemplary embodiment does not exhaust the possible structural variants
of the device. The number of coils optimal for different working conditions, tank
dimensions, and the desired total efficiency of the device is determined based on
the tests and efficiency calculations for a single coil with the predetermined diameters,
thickness of tube walls, tube lengths, the agents flowing inside, the temperatures
at inlet and outlet, and other additional requirements. When appropriate heat exchange
agents are used and the direction of their flow is externally forced, the device according
to the invention can work as both a condenser, and an evaporator.
1. Heat exchange device having a coil heat exchanger with inlets and outlets for the
heat exchanging agents and a tank (1) for one of the agents, where the tank is provided
with an inlet and outlet stub pipes wherein the coil heat exchanger consists of at
least one coil (2A,2B) wound spirally around the tank (1) on its outside, characterised in that the coil takes the form of three coaxial tubes, where the outer tube (3) and inner
tube (4) serve as the first flow ducts (K1) for the first agent, and the central tube
(5) serves as the second flow duct (K2) for the second agent, and where at the first
end of the coil (2A,2B) its outer tube (3) and inner tube (4) are connected by way
of the first collector (6) to the inlet stub pipe (7) for the supply of the first
agent, and the central tube (5) is connected by way of the second collector (8) to
the outlet (9) of the second agent, while at the other end of the coil (2A,2B) its
outer tube (3) and inner tube (4) are connected with the inside of the tank (1) by
way of the third collector (10) and a supply stub pipe (11), and the central tube
(5) is connected to the inlet (14) of the second agent by way of the fourth collector
(12) and a supply pipe (13).
2. The device according to Claim 1, characterised in that the first end of the coil with the first and second collectors (6,8), the inlet stub
pipe (7) for the supply of the first agent and outlet (9) of the second agent are
placed in the bottom part of the tank (1), and the second end of the coil with the
third and fourth collectors (10,12) and the supply stub pipe (11) are placed in the
top part of the tank (1).
3. The device according to Claim 2, characterised in that the second collector (8) is placed inside the first collector (6), and the fourth
collector (12) is placed inside the third collector (10).
4. The device according to Claim 3, characterised in that the second agent inlet (14) is placed in the bottom part of the tank (1), and the
supply pipe (13) runs vertically along the outer wall of the tank (1).
5. The device according to Claim 4, characterised in that at the inlet to the fourth collector (12) the supply pipe (13) ends with an elbow
(15) in the shape of reversed letter U.
6. The device according to Claims 1 - 5, characterised in that there are at least two coils (2A,2B) wound around the tank (1) on its outside, where
the subsequent turns of the coils are arranged alternatingly and the ends of all coils
are inserted in the shared collectors: the first, second, or third collector, respectively
(6,8,10,12).
7. The device according to Claims 1 - 6, characterised in that the subsequent turns of the coils contact one another tightly, without any free space
left in between.
8. The device according to Claims 1 - 7, characterised in that the coaxial tubes of the exchanger are fitted with distancing elements.
9. The device according to Claim 8, characterised in that the outer tube (3) and central tube (5) have indentations (18) on their outer surfaces,
where the depth of the indentations ensures the required distance between the tubes.
10. The device according to Claim 8, characterised in that the outer tube (3) and the central tube (5) have spiral notches (20) on their outside
surfaces, where the depth of the notches ensures the required distance between the
tubes.
11. The device according to Claim 8, characterised in that the inner tube (4) and the central tube (5) are provided with distancing wires (19)
wound spirally around them on the outside, where the diameter of the wires ensures
the required distance between the tubes.
12. The device according to Claims 1 - 11, characterised in that the ratio between the diameters of the coaxial tubes of the coil falls within the
range between 1:1.05:1.1 and 1:3:6.
1. Wärmetauschervorrichtung mit einem Schlangenwärmetauscher mit Ein- und Auslässen für
Wärmeträgermittel und einem Behälter (1) für einen der Wärmeträgermittel mit einem
Zuführungsstutzen und einem Ableitstutzen, wobei der Schlangenwärmetauscher über mindestens
eine Schlange (2A, 2B) verfügt, die spiralförmig um den Behälter (1) auf dessen Umfang
aufgewickelt ist, dadurch gekennzeichnet, dass die Schlange aus drei koaxialen Rohren besteht, wobei das Außenrohr (3) und das Innenrohr
(4) die ersten Durchflusskanäle (K1) für das erste Mittel und das Mittelrohr (5) den
zweiten Durchflusskanal (K2) für das zweite Mittel bilden, wobei am ersten Ende der
Schlange (2A, 2B) das Außenrohr (3) und das Innenrohr (4) über den ersten Sammler
(6) mit dem Zuführungsstutzen (7) der ersten Mittels und das Mittelrohr (5) über den
zweiten Sammler (8) mit dem Auslass (9) der zweiten Mittels verbunden sind und am
zweiten Ende der Schlange (2A, 2B) das Außenrohr (3) und das Innenrohr (4) über den
dritten Sammler (10) und den Einleitstutzen (11) mit dem Innenbereich des Behälters
(1) verbunden ist und das Mittelrohr (5) über den vierten Sammler (12) und das Einleitrohr
(13) mit dem Einlass (14) des zweiten Mittels verbunden ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das erste Ende der Schlange mit dem ersten und zweiten Sammler (6, 8), dem Zuführungsstutzen
(7) des ersten Mittels und dem Ausgang (9) des zweiten Mittels sich im unteren Teil
des Behälters (1) und das zweite Ende der Schlange mit dem dritten und vierten Sammler
(10, 12) und dem Einleitstutzen (11) sich im oberen Teil des Behälters (1) befinden.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der zweite Sammler (8) im ersten Sammler (6) und der vierte Sammler (12) im dritten
Sammler (10) positioniert sind.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der Einlass (14) des zweiten Mittels sich im unteren Teil des Behälters (1) befindet
und das Zuführungsrohr (13) vertikal entlang der Innenwand des Behälters (1) angeordnet
ist.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Zuführungsrohr (13) am Eingang des vierten Sammlers (12) mit dem Bogenstück (15)
in Form des umgekehrten U-Buchstabens abschließt.
6. Vorrichtung nach Anspruch 1 - 5, dadurch gekennzeichnet, dass sie im Kreislauf des Behälters (1) über mindestens zwei Schlangen (2A, 2B) verfügt,
deren Rohre abwechselnd angeordnet sind und die Enden aller Schlangen an gemeinsame
Sammler, entsprechend an den ersten, zweiten und dritten Sammler (6, 8, 10, 12) angeschlossen
sind.
7. Vorrichtung nach Anspruch 1 - 6, dadurch gekennzeichnet, dass die Rohre der Schlangen ohne Zwischenabstände nebeneinander angeordnet sind.
8. Vorrichtung nach Anspruch 1 - 6, dadurch gekennzeichnet, dass die koaxialen Rohre des Wärmetauschers über Distanzmittel verfügen.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Außenrohr (3) und das Mittelrohr (5) an ihren Außenflächen Vertiefungen (18)
aufweisen, deren Tiefe den erforderlichen Abstand zwischen den Rohren gewährleistet.
10. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Außenrohr (3) und das Mittelrohr (5) an ihren Außenflächen spiralförmige Kerben
(20) aufweisen, deren Tiefe den erforderlichen Abstand zwischen den Rohren gewährleistet.
11. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Innenrohr (4) und das Mittelrohr (5) an ihren Außenflächen spiralförmig aufgewickelte
Trenndrähte (19) aufweisen, deren Durchmesser den erforderlichen Abstand zwischen
den Rohren gewährleistet.
12. Vorrichtung nach Anspruch 1 - 11, dadurch gekennzeichnet, dass das Verhältnis der Durchmesser der koaxialen Rohren der Schlange im Bereich 1:1,05:1,1
bis 1:3:6 liegt.
1. Un dispositif d'échange de chaleur ayant un échangeur de chaleur à serpentin avec
entrées et sorties des fluides échangeurs de chaleur et un réservoir (1) d'un des
fluides munie d'une tubulure d'alimentation entrée et d'une tubulure d'évacuation,
l'échangeur de chaleur à serpentin comprenant au moins un serpentin (2A, 2B) enroulé
en spirale autour du réservoir (1) sur son pourtour extérieur caractérisé en ce que le serpentin se présente sous la forme de trois tubes coaxiaux, dont le tube extérieur
(3) et le tube intérieur (4) constituent les premiers canaux d'écoulement (K1) pour
le premier fluide et le tube intermédiaire (5) est le second canal d'écoulement (K2)
pour le second fluide, à la première extrémité du serpentin (2A, 2B), son tube extérieur
(3) et le tube intérieur (4) sont reliés par l'intermédiaire du premier collecteur
(6) à la tubulure d'alimentation (7) du premier fluide et la tube intermédiaire (5)
est reliée par l'intermédiaire du deuxième collecteur (8) à la sortie (9) du second
fluide, tandis qu'à l'autre extrémité du serpentin (2A, 2B), son tube extérieur (3)
et le tube intérieur (4) sont reliés par l'intermédiaire du troisième collecteur (10)
et de la tubulure d'entrée (11) à l'intérieur du réservoir (1), et le tube intermédiaire
(5) est relié par l'intermédiaire du quatrième collecteur (12) et du tuyau d'alimentation
(13) à l'entrée (14) du second fluide.
2. Le dispositif selon la revendication 1 caractérisé en ce que la première extrémité du serpentin avec le premier et le deuxième collecteur (6,8),
la tubulure d'alimentation (7) du premier fluide et la sortie (9) du second fluide
se trouvent dans la partie inférieure du réservoir (1) et l'autre extrémité du serpentin
avec le troisième et le quatrième collecteur (10, 12) et la tubulure d'entrée (11)
se trouvent dans la partie supérieure du réservoir (1).
3. Le dispositif selon la revendication 2 caractérisé en ce que le deuxième collecteur (8) est situé à l'intérieur du premier collecteur (6) et le
quatrième collecteur (12) est situé à l'intérieur du troisième collecteur (10).
4. Le dispositif selon la revendication 3, caractérisé en ce que l'entrée (14) du second fluide se trouve dans la partie inférieure du réservoir (1)
et que le tuyau d'alimentation (13) passe verticalement le long de la paroi extérieure
du réservoir (1).
5. Le dispositif selon la revendication 4, caractérisé en ce que le tuyau d'alimentation (13) à l'entrée du quatrième collecteur (12) se termine par
un coude (15) en forme de lettre U inversée.
6. Le dispositif selon les revendications 1-5, caractérisé en ce qu'au moins deux serpentins (2A, 2B) se trouvent sur la circonférence du réservoir (1),
dont les bobines consécutives sont disposées en alternance et les extrémités de tous
les serpentins sont introduites dans les collecteurs communs, respectivement les premier,
deuxième et troisième collecteurs (6, 8, 10, 12).
7. Le dispositif selon les revendications 1 - 6, caractérisé en ce que les bobines consécutives de serpentins sont adjacentes sans espace entre elles.
8. Le dispositif selon les revendications 1 - 7, caractérisé en ce que les tubes coaxiaux de l'échangeur sont munis de moyens d'entretoise.
9. Le dispositif selon les revendications 8 caractérisé en ce que le tube extérieur (3) et le tube intermédiaire (5) présentent des évidements (18)
sur leurs circonférences extérieures ayant une profondeur garantissant la distance
requise entre les tubes.
10. Le dispositif selon les revendications 8 caractérisé en ce que le tube extérieur (3) et le tube intermédiaire (5) présentent des encoches en spirale
(20) sur leurs circonférences extérieures ayant une profondeur garantissant la distance
requise entre les tubes.
11. Le dispositif selon les revendications 8 caractérisé en ce que le tube intérieur (4) et le tube intermédiaire (5) sont pourvus sur leurs circonférences
extérieures de fils de séparation enroulés en spirale (19) ayant un diamètre garantissant
la distance requise entre les tubes.
12. Le dispositif selon les revendications 1- 11 caractérisé en ce que le rapport des diamètres coaxiaux des tubes du serpentin est compris entre 1 :1,05
:1,1 et 1 :3 :6.
REFERENCES CITED IN THE DESCRIPTION
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It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description