EP1286565B1 - Induktionswärmetauscher - Google Patents

Induktionswärmetauscher Download PDF

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Publication number
EP1286565B1
EP1286565B1 EP02292065A EP02292065A EP1286565B1 EP 1286565 B1 EP1286565 B1 EP 1286565B1 EP 02292065 A EP02292065 A EP 02292065A EP 02292065 A EP02292065 A EP 02292065A EP 1286565 B1 EP1286565 B1 EP 1286565B1
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EP
European Patent Office
Prior art keywords
exchanger
pipes
tubes
coils
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02292065A
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English (en)
French (fr)
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EP1286565A1 (de
Inventor
Jacques Nuns
Guy Deschamps
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electricite de France SA
Original Assignee
Electricite de France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electricite de France SA filed Critical Electricite de France SA
Publication of EP1286565A1 publication Critical patent/EP1286565A1/de
Application granted granted Critical
Publication of EP1286565B1 publication Critical patent/EP1286565B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid

Definitions

  • the invention lies in the field of multitubular heat exchangers.
  • the heating means is constituted by a plurality of tubes heated by inductive current.
  • Induction heating of metal parts or of conductive material in particular to bring them to a temperature conducive to their transformation of shape, is now well known and well controlled, especially with regard to the induction current frequencies allowing the best energy efficiencies as a function of the nature of the material constituting the part to be heated, its shape and the nature of the heat treatment that is to be applied to it. It is known in particular to heat inductive conductive tubes.
  • the tube to be heated is introduced into a space where inductive fields formed by inductors which can be controlled to produce induced currents in the tube which will heat the tube in the manner and at the temperature desired for heating. the treatment to apply to the tube.
  • induction heating indirectly to heat heating elements by example of the tubes which themselves heat by heat conduction a product in contact with said elements.
  • An example of a device for electric heating of a fluid circulating in tubes heated by induction of current in the tubes is described in the patent of invention.
  • FR 2,741,773 attributed to the present applicant.
  • the tubes form the secondary circuit of a transformer having a magnetic core shaped frame.
  • the frame has studs around which are wound primary inductor coils. Pairs of tubes are arranged on either side of each upright.
  • the high and low ends of the tubes of a pair are interconnected by a conductive part so that each pair of tubes forms a closed electrical circuit in which the secondary current of the transformer flows.
  • each pair of tubes forms with the end conductive parts a turn of a secondary winding of the transformer. It can therefore be considered that this is an alternative embodiment of current flow tubes, wherein the current source is constituted by the primary of a transformer. It is also known that induction heating makes it possible to benefit in particular from an almost instantaneous start-up, control and regulation possibilities of the very fine power absorbed, allowing precise adjustment of the temperature of heating elements.
  • an exchanger for a fluid wherein the fluid to be heated circulates inside or outside or both inside and outside of a plurality of tubes conductors.
  • the fluid to be heated circulates inside or outside or both inside and outside of a plurality of tubes conductors.
  • it is intended to have in a space where a variable magnetic field is created by one or more inductive windings a plurality of conductive tubes.
  • a part of the magnetic field formed by the currents in each of the tubes forms currents for the other tubes so that the intensity of the variable magnetic field is homogenized inside the inductor.
  • the tubes are grouped in an open space, it is possible to include the heating part of the tubes in a sealed enclosure and to circulate the fluid not only inside the tubes but also in the sealed chamber.
  • the heating surface can be constituted either by the inner surface alone or by the outer surface alone or by the inner and outer surfaces of the tubes.
  • Tubular plates for connecting the tubes to connection structures are located outside the magnetic field created by the inductor windings, so that the fastenings of the tube ends to the tube plates are outside the tube areas which are heated by the currents. induced.
  • the temperatures of the fixing zones are thus substantially constant during operation and equal to the temperature of the heated fluid, so that the longevity of the fasteners is improved.
  • the invention relates to an exchanger comprising a conductive exchange surface heated by currents induced by one or more inductor windings supplied by one or more alternative sources, characterized in that the exchange surface is constituted by a surface of a plurality of electrically conductive tubes, said plurality of tubes being disposed at least for a portion of their respective lengths within the winding (s) creating the inducing magnetic field.
  • the power supply source (s) will be resonance-type frequency converters.
  • the tubes are parallel to each other and to an axial direction OO 'over part of their length located inside the inductor windings, the axial direction OO' being the axial line of the inductor winding or windings.
  • the fluid to be heated by conduction in contact with the walls of the tubes may be housed or circulate inside the tubes.
  • each of the tubes having two ends, a first and a second, each of the first ends communicates with a first connection structure and each of the second ends communicates with a second structure. connection, each of the first and second connecting structure connecting the interior of each of the tubes to a single conduit.
  • the fluid to be heated by conduction in contact with the walls of the tubes may also be housed or circulate outside the tubes.
  • an enclosure sealingly surrounds the plurality of tubes.
  • This enclosure has openings communicating with a first connection structure connected to a first conduit and with a second connection structure communicating with a second conduit. The fluid can thus be fed into the tubes through the second conduit and discharged from the tubes through the first conduit continuously or discontinuously through the second and first structures respectively.
  • inductive windings provided with connections for connecting each winding to a variable current source are arranged around the tubes contained in the enclosure, so as to generate inductive currents in said tubes when a variable current flows through the windings.
  • inductive power sources are not necessarily identical to each other. In particular it may be interesting to connect the windings to sources of different frequencies from each other.
  • an enclosure sealingly surrounds the plurality of tubes, this enclosure having openings communicating it with a first connection structure connected to a first conduit and with a second connection structure. connection connected to a second conduit so that a fluid can be introduced and removed from the enclosure having been in contact with the outer surface and / or inner tubes.
  • the tubes are arranged parallel to the axis of the cylindrical wall, and the inductive windings are arranged regularly along the tubes outside or on the outside. inside the enclosure, or some of them can be arranged inside and others outside the enclosure.
  • the windings preferably have, for axis, the axis of the cylindrical wall.
  • magnetic yokes can be introduced into the exchanger.
  • the tubes are arranged parallel to a common axis on a regular basis.
  • the centers of the tubes of a cross section of the set of tubes perpendicular to the axis of the tubes are at the top of one or more regular polygons inscribed in a circle or several concentric circles.
  • the cylinder head can take the form of two blocks of magnetic material arranged in the center of the regular polygons and spaced from each other so as to channel the lines of the magnetic field produced by the inductive windings.
  • the figure 1 represents a longitudinal section along line BB of the figure 2 of an exchanger 100 according to the invention.
  • a plurality 2 of tubes 3 preferably parallel to each other as shown figure 1 is surrounded over part of its length by one or preferably several inductive windings 4.
  • Each winding is equipped with electrical connection means not shown to a current source not shown.
  • the straight sections of the conductors constituting the or preferably the inductive windings 4 are symbolized by black dots.
  • the tubes 3 are straight, of equal length and parallel to an axial direction OO 'of the plurality 2 of tubes 3.
  • the tubes 3 are preferably as shown figures 1 and 2 arranged in a symmetry of revolution about the axis OO '.
  • Each tube 3 has two ends a first 5, and a second 6.
  • the tubes 3 are equipped between their two ends at least partly of temperature sensors 18.
  • at least one of the tubes 3 is provided with a plurality of temperature sensors 18 along its length.
  • Each of the first ends 5 is embedded in a tubular plate 7 so that a fluid can pass through this plate and be in communication with the inside of the tubes 3.
  • each of the second ends 6 is embedded in a tube plate 8 so that a fluid can pass through the plate 8 and be in communication with the inside of the tubes 3.
  • the tubular plate 7 is equipped with a non-through hole 28 centered on the axis OO '.
  • a structure 9 in the form of a funnel is constituted by a frustoconical wall 10 centered on the axis OO '.
  • the frustoconical wall 10 has a first end 11 having a wide opening and a second end 12 having a narrow opening. The openings are qualified wide and narrow relative to each other.
  • the first end 11 of the frustoconical wall 10 having a wide opening is extended by a cylindrical wall 13 sealingly fitted in the non-through hole 28 of the tubular plate 7.
  • the second end 12 of the frustoconical wall 10 having a narrow opening is extended by a cylindrical wall 14.
  • the cylindrical wall 14 forms a conduit 14 for discharging a fluid from the tubes 3.
  • the conduit 14 comprises a valve 15 for opening or closing the conduit.
  • the conduit 14 is terminated by connecting means 17 for connecting the exchanger to an external conduit not shown.
  • a funnel-shaped structure 9 ' is constituted by a frustoconical wall 10' centered on the axis OO '.
  • the frustoconical wall 10 ' has a first end 11' having a wide opening and a second end 12 'having a narrow opening.
  • the first end 11 'of the frustoconical wall 10' having a wide opening is extended by a cylindrical wall 13 'sealingly fitted in a non-through hole 28' of the tube plate 8.
  • the second end 12 'of the frustoconical wall 10 'having a narrow opening is extended by a cylindrical wall 14'.
  • the cylindrical wall 14 ' forms a conduit 14' for supplying a fluid to be heated from the outside to the inside of the tubes 3 through the tube plate 8.
  • the conduit 14 ' may comprise a valve allowing to open or close the conduit 14 '.
  • the conduit 14 ' is terminated by means 17' of connection for connecting the exchanger 100 to an outer conduit not shown.
  • the tubes 3 are in one piece inside and in the vicinity of the cylindrical volume delimited by the inductor windings 4. There is no tubular plate for positioning or connecting the tubes 3 inside and the cylindrical volume defined by the inductor windings 4.
  • the tubular plates 7 and 8, to which the first 5 and second 6 ends of the tubes 3 are respectively connected, are located outside the cylindrical volume defined by the inductor windings 4 and its vicinity. immediate.
  • welds or brazing connections of the ends of the tubes 3 to the tube plates 7 and 8 are outside the heated zone by the induced currents. In this way the temperature of these connections is never greater than the temperature of the material to be heated.
  • the tubes 3 do not touch each other, at least in the cylindrical volume delimited by the inductor windings 4.
  • the induced currents are specific to each tube and the tube-to-tube energy supply is better controlled. .
  • the structures 9, 9 'respectively comprising the elements 10-15, 10'-15' form the connecting means of the exchanger to external conduits for evacuation and supply of a fluid.
  • the tubular plate 7 comprises 4 arms 16 for mechanically holding turns constituting together the the inductive windings 4. These arms 16 are arranged perpendicular to the plate 7, that is to say parallel to the axis OO '.
  • the figure 2 is a cross section along the line AA of the exchanger example shown figure 1 . It is intended to show an example of arrangements of tubes 3 relative to each other. Naturally other configurations are possible.
  • tubes 3 have the same diameter. This non-mandatory feature simplifies manufacturing and supplies.
  • the centers of the sections of the tubes are located on concentric circles centered on the axis OO '.
  • the centers of the sections of the tubes 3 are located at the vertices of a regular polygon inscribed in the circle.
  • the regular polygons are, on each circle, octagons, so that there is the same number of tubes, or 8 tubes 3, centered on each circle.
  • In total there are 40 tubes 3. Because near the center the diameters of the circles are smaller, the density of tubes is greater in the center than at the periphery of the exchanger.
  • the tubes of two circles immediately adjacent to each other are arranged in staggered relation to each other.
  • a fluid to be heat treated is sent by the supply means 9 'into the tubes 3 through the tubular plate 8 and is evacuated by the evacuation means 9 through the tubular plate 7.
  • the heating of the fluid is carried out continuously, that is to say that the discharge valve 15 and optionally a supply valve are open and that the fluid enters and leaves the exchanger continuously in a continuous movement.
  • the circulation of the fluid introduced into the exchanger could be discontinuous.
  • the fluid is immobilized during a heating period and then evacuated.
  • Each of the windings 4 is traversed by a variable current which induces currents in the tubes 3. These tubes heat up. During the period of contact with the tubes 3, the fluid is heated by the hot tubes 3. The fluid becomes hotter and heavier as it approaches the evacuation structure 9.
  • the fact of having several independent windings, that is each connected to their own current source allows a temperature control by area as explained below.
  • the temperature sensors 18 are part of a temperature control loop for controlling the temperature of the tubes 3 around the area where the temperature sensor is located.
  • On the figure 3 there is shown a half view of a portion of tubes 3, one of which is referenced 31 is equipped with a first sensor 18-1 located at a first level and a second sensor 18-2 located at a second level. Windings 41, 42 independent of each other, are located substantially to the right of the sensors 18-1, 18-2 respectively. Depending on the difference between a desired temperature at the sensor 18-1 and a real temperature measured by this sensor, a variation of the intensity will be controlled.
  • the source S1 includes regulating means in themselves known and not shown receiving the temperature indication or temperature deviation from a theoretical value. Since the power source S1 of the winding 41 is independent, it is possible to modify the quantity of heat transmitted by the exchanger only at the level where the sensor 18-1 is located. The same applies to the area around the sensor 18-2, its independent winding 42 and its power source not shown S2. Of course the number of sensors along a tube is not limited. If there are several sensors at the same level on several tubes, the winding located at this level can be driven in current depending on the value of a combination involving the different values measured by the different sensors located at this level. .
  • one or more tubes are equipped with one or more temperature sensors each having an output coupled to means for regulating the electrical power supplying one or more windings.
  • one or more temperature sensors at the level of, for example, the fluid discharge duct 14 and to control one or more sources as a function of the values or deviations of values determined from these sensors.
  • FIG. 4 This figure represents the upper part of a heat exchanger as shown figure 1 .
  • elements having the same function as those described in connection with the figure 1 have the same reference numbers. It will not be described again.
  • the tubular plate 7 comprises an upper non-through hole 28 as described in connection with the figure 1 , allowing the tight connection of the connection structure 9. It also comprises a lower non-through hole 20 allowing the tight connection of a cylindrical wall 21.
  • the cylindrical wall 21 surrounds the plurality 2 of tubes 3.
  • the cylindrical wall 21 is also sealingly connected to the lower tubular plate 8.
  • Each of the upper and lower tubular plates 7 and 7 is pierced with through-holes 22 in the plate portion which is both inside the part delimited by the connection structure 9 , 9 'respectively and inside the portion delimited by the cylindrical wall 21.
  • This configuration allows fluid arriving through the connecting structure 9' to be introduced through through holes 22 'of the plate 7 in a chamber Heating element delimited by the cylindrical wall 21 and the tubular plates 7, 8, then discharged to the connection structure 9 through the through holes 22. It thus benefits from a doubled heating surface since formed of the inner and outer surfaces of the tubes 2.
  • an enclosure surrounds sealingly the plurality 3 of tubes 2. This enclosure has openings that in communication with the first connection structure 9 connected to the first conduit 14 and with the second structure 9 'of connection connected to the second conduit 14' so that a fluid can be introduced and removed from the enclosure having been in contact with the outer and inner surfaces of the tubes 2. If in this variant embodiment, for any reason, for example for cleaning difficulties, it is not desired to pass the fluid into the tubes 2, it is sufficient that the tubes 2 do not open into the connecting structures 9, 9 '.
  • the cylindrical wall 21 may be conductive on a part of its surface, that is to say formed by conductive parts interconnected by non-conductive parts. It can also be weakly conductive or non-conductive of electricity. The essential thing is that it does not prevent the formation of the currents induced in the tubes 2 by the inductor currents flowing in the inductor windings 4.
  • the inductor windings 4 it will be possible to arrange them schematically as shown figure 5 two masses 23 of magnetic material, for example ferro-magnetic, centered on the axis OO 'and substantially at the ends of the inductor windings 4 as shown figure 5 .
  • the field lines are channeled along the axis OO 'over the entire length of the tubes 2 located inside the windings 4. This improves the distribution of the power transmitted to each tube.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (10)

  1. Wärmetauscher (100) mit einer elektrisch leitfähigen Austauschfläche, beheizt mittels Strömen, induziert durch eine oder mehrere Induktionswicklungen (4, 41, 42), die durch eine oder mehrere Wechselstromquellen (S1) gespeist werden, wobei die Austauschfläche durch eine Fläche einer Vielzahl (2) elektrisch leitfähiger Rohre (3) gebildet wird, die im Innern der das magnetische Induktionsfeld erzeugenden Wicklung oder Wicklungen (4, 41, 42) über einen Teil ihrer jeweiligen Längen parallel zueinander und zu einer axialen Richtung 00' in konzentrischen Kreisen mit Achsen OO' angeordnet sind, an den Spitzen eines jedem der Kreise einbeschriebenen regulären Polygons, wobei die axiale Richtung OO' die Axiallinie der Induktionswicklung(en) (4, 41, 42) ist,
    dadurch gekennzeichnet, dass er zwei auf die Achse OO' zentrierte magnetische Massen (23) umfasst.
  2. Wärmetauscher (100) nach Anspruch 1, dadurch gekennzeichnet, dass sich jede der magnetischen Massen (23) im Wesentlichen auf Höhe der Endstücke der Induktionswicklungen (4) befindet.
  3. Wärmetauscher (100) nach Anspruch 1, dadurch gekennzeichnet, dass erste und zweite Enden (5, 6) der Rohre jeweils mit ersten und zweiten Rohrplatten (7, 8) verbunden sind, die Rohre (3) im Innern und in der Umgebung eines durch die Induktionswicklungen (4, 41, 42) begrenzten zylindrischen Volumens aus einem Stück sind.
  4. Wärmetauscher (100) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die elektrische(n) Versorgungsquelle(n) Frequenzwandler des Resonanztyps sind.
  5. Wärmetauscher (100) nach einem der Ansprüche 1, 2 oder 4, dadurch gekennzeichnet, dass jedes der Rohre (3) zwei Enden (5, 6) hat, ein erstes (5) und ein zweites (6), jedes der ersten Enden (5) mit einer ersten Anschlussstruktur (9) kommuniziert und jedes der zweiten Enden (6) mit einer zweiten Anschlussstruktur (9') kommuniziert, jede der genannten - ersten und zweiten - Anschlussstrukturen (9, 9') die Kommunikation des Innern jedes Rohrs (3) mit einer Leitung (14, 14') herstellt.
  6. Wärmetauscher (100) nach Anspruch 1, dadurch gekennzeichnet, dass ein Behälter (25) die Mehrzahl der Rohre dicht umschließt, wobei dieser Behälter (25) Öffnungen (22) hat, die mit einer an eine erste Leitung (14) angeschlossenen ersten Anschlussstruktur (9) und mit einer an eine zweite Leitung (14') angeschlossenen zweiten Anschlussstruktur (9') kommunizieren, so dass ein Fluid in den Behälter (25) hinein und - nach Kontakt mit der Außenoberfläche der Rohre (3) - aus ihm herausströmen kann.
  7. Wärmetauscher (100) nach Anspruch 1, dadurch gekennzeichnet, dass ein Behälter (25) die Mehrzahl der Rohre dicht umschließt, wobei dieser Behälter (25) Öffnungen (22) hat, die mit einer an eine erste Leitung (14) angeschlossenen ersten Anschlussstruktur (9) und mit einer an eine zweite Leitung (14') angeschlossenen zweiten Anschlussstruktur (9') kommunizieren, so dass ein Fluid in den Behälter (25) hineinströmen und mit der Innen- und Außenoberfläche der Rohre (3) Kontakt haben kann.
  8. Wärmetauscher (100) nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dass der Behälter (25) gebildet wird durch eine zylindrische Wand (21) mit der Achse 00' und zwei Enden, einem ersten und einem zweiten, und durch die erste (7) und die zweite (8) Rohrplatte, wobei das erste Ende der zylindrischen Wand (21) dicht mit der ersten Rohrplatte (7) verbunden ist und in dieser ersten Platte (7) die ersten Enden der Rohre (3) stecken, und das zweite Ende der zylindrischen Wand (21) dicht mit der zweiten Rohrplatte (8) verbunden ist und in dieser zweiten Platte (8) die zweiten Enden der Rohre (3) stecken, so dass ein Fluid durch die zweite Rohrplatte (8) hindurch in die Rohre (3) hineinströmen und durch die erste Rohrplatte (7) hindurch aus ihnen herausströmen kann.
  9. Wärmetauscher (100) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass ein oder mehrere Rohre (3) mit einem oder mehreren Temperatursensoren (18) ausgestattet sind, von denen jeder einen Ausgang hat, der mit Regeleinrichtungen der elektrischen Leistung gekoppelt ist, die in eine oder mehrere Wicklungen eingespeist wird.
  10. Wärmetauscher (100) nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass eine Entleerungsleitung des in dem Behältnis enthaltenen Fluids mit einem oder mehreren Temperatursensoren ausgestattet ist, von denen jeder einen Ausgang hat, der mit Regeleinrichtungen der elektrischen Leistung gekoppelt ist, die in eine oder mehrere Wicklungen (4, 41, 42) eingespeist wird.
EP02292065A 2001-08-23 2002-08-21 Induktionswärmetauscher Expired - Lifetime EP1286565B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0111041A FR2828980B1 (fr) 2001-08-23 2001-08-23 Echangeur thermique a induction
FR0111041 2001-08-23

Publications (2)

Publication Number Publication Date
EP1286565A1 EP1286565A1 (de) 2003-02-26
EP1286565B1 true EP1286565B1 (de) 2009-04-22

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EP02292065A Expired - Lifetime EP1286565B1 (de) 2001-08-23 2002-08-21 Induktionswärmetauscher

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EP (1) EP1286565B1 (de)
AT (1) ATE429797T1 (de)
DE (1) DE60232048D1 (de)
ES (1) ES2326261T3 (de)
FR (1) FR2828980B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016119668A1 (de) 2016-10-14 2018-04-19 Heinrich Graucob Induktiver Wärmespeicher und Verfahren zur Umwandlung von thermischer Energie in elektrische Energie

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100394120C (zh) * 2005-12-16 2008-06-11 王文生 一种电磁感应热管

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017701A (en) * 1972-02-29 1977-04-12 Illinois Tool Works Inc. Induction heating unit with combined tank circuit and heating coil
DE2745135A1 (de) * 1977-10-07 1979-04-12 Kali Chemie Ag Induktionswaermetauscher
US4359620A (en) * 1977-12-06 1982-11-16 Amp Incorporated Induction heating apparatus
US4341936A (en) * 1979-12-17 1982-07-27 Virgin George C Electromagnetic induction energy converter
DE3314824A1 (de) * 1983-04-23 1984-10-31 Otto Junker Gmbh, 5107 Simmerath Vorrichtung zur erhitzung des innenraumes von behaeltern
FR2568083A1 (fr) * 1984-07-20 1986-01-24 Michel Dentroux Perfectionnements apportes aux dispositifs de chauffage de fluide par induction.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016119668A1 (de) 2016-10-14 2018-04-19 Heinrich Graucob Induktiver Wärmespeicher und Verfahren zur Umwandlung von thermischer Energie in elektrische Energie

Also Published As

Publication number Publication date
ES2326261T3 (es) 2009-10-06
FR2828980B1 (fr) 2004-01-09
FR2828980A1 (fr) 2003-02-28
DE60232048D1 (de) 2009-06-04
EP1286565A1 (de) 2003-02-26
ATE429797T1 (de) 2009-05-15

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