EP0447438B1 - Elektrisch beheizter wärmespeicherkessel - Google Patents

Elektrisch beheizter wärmespeicherkessel Download PDF

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Publication number
EP0447438B1
EP0447438B1 EP90900240A EP90900240A EP0447438B1 EP 0447438 B1 EP0447438 B1 EP 0447438B1 EP 90900240 A EP90900240 A EP 90900240A EP 90900240 A EP90900240 A EP 90900240A EP 0447438 B1 EP0447438 B1 EP 0447438B1
Authority
EP
European Patent Office
Prior art keywords
bricks
boiler
core
boiling
tubes
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
EP90900240A
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English (en)
French (fr)
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EP0447438A1 (de
Inventor
Peter Joseph Newton
Thomas Henry Joyes
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.)
DIMPLEX (UK) Ltd
Original Assignee
DIMPLEX (UK) Ltd
DIMPLEX UK Ltd
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
Priority claimed from GB888828422A external-priority patent/GB8828422D0/en
Priority claimed from GB888828421A external-priority patent/GB8828421D0/en
Priority claimed from GB898901281A external-priority patent/GB8901281D0/en
Priority claimed from GB898922306A external-priority patent/GB8922306D0/en
Application filed by DIMPLEX (UK) Ltd, DIMPLEX UK Ltd filed Critical DIMPLEX (UK) Ltd
Publication of EP0447438A1 publication Critical patent/EP0447438A1/de
Application granted granted Critical
Publication of EP0447438B1 publication Critical patent/EP0447438B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
    • F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
    • F24H7/04—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid
    • F24H7/0408—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using electrical energy supply
    • F24H7/0433—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using electrical energy supply the transfer medium being water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/028—Steam generation using heat accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/282—Methods of steam generation characterised by form of heating method in boilers heated electrically with water or steam circulating in tubes or ducts

Definitions

  • the invention relates to boilers in which water is heated by electricity, through the medium of a core of material capable of storing heat, the core being heated by electrically powered heating elements and heat from the core being transferred to a secondary circuit in which a fluid, commonly water, is circulated, as in the case of a domestic central heating or hot water system. It is envisaged that such electrically heated boilers be used in place of gas, oil or solid fuel boilers which also heat fluid secondary circuit in a way which is familiar.
  • Electric boilers which include a core and elements as referred to above, and in which transfer of heat from the core to the secondary circuit is achieved using air as the heat transfer medium. Thus air is heated by the core and the heated air passes over a heat exchanger through which water in the secondary circuit passes.
  • a more recent approach to an electric storage boiler is to utilise steam as the medium for transferring heat from the store to the secondary circuit.
  • the general arrangement which has been proposed has a core of material capable of storing heat, electrically heated element means in the core, a primary heating circuit, in which water is supplied to the base of boiling tubes which pass steam upwards through the core to a heat exchanger, from which condensed water is returned to the base of the boiling tubes, losses being made up from a header tank or similar arrangement, and a secondary heating circuit portion which passes through the heat exchanger and which is connected, in use, to a secondary heating circuit in a conventional way, the secondary heating circuit including radiators and/or a coil for heating water in a domestic hot water cylinder.
  • an electric boiler will be referred to hereinafter as "an electric boiler of the kind described", and is envisaged as a substitute for a gas, oil or solid fuel boiler.
  • Electric boilers as defined in the pre-characterising part of claim 1 are known from DE-A-1812340 and FR-A-1434485.
  • a practical problem with electric boilers of the kind described is arranging for manageable installation and servicing, for example replacement of heating elements which may fail from time to time.
  • a substantial weight of heat storing bricks is necessary and it is desirable to be able to install and service the boiler from a single direction, preferably from the front so that the boiler can be placed, if desired, under a working surface.
  • an electric boiler in which a liquid is heated by means of a heat storing core, the core consisting of a multiplicity of first heat storing bricks and being heated by electrically powered heating elements, and heat from the core is transferred to a primary heating circuit in which the liquid is circulated, the primary heating circuit comprising a plurality of boiling tubes extending substantially vertically in an insulated casing surrounding the core, the casing having a front face, a rear face and two side faces, said boiling tubes being arranged in at least one row extending essentially parallel to said front face, said first bricks lying against the boiling tubes and having side face profiles formed to provide channels for accepting part of a boiling tube whereby a combination of such first bricks surrounds a length of boiling tubes, characterised in that said front face is openable to allow installation of the core and access thereto, and between the side faces of the casing and the first bricks as well as between the first bricks of two adjacent tubes of the same row are arranged second bricks which do not engage any parts of the boiling tubes.
  • the bricks in an assembled core preferably define channels extending from front to rear of the boiler, the heating elements being elongate and located in the core by sliding into the channels from the front of the core.
  • Each element is preferably U-shaped.
  • the cross-sectional profile of the element channels and the cross-section of the heating elements are preferably such that contact is achieved between a portion of the external surface of each element and the adjacent bricks.
  • the bricks which lie against the boiling tubes may be of a different profile from the second bricks.
  • the second bricks preferably have planar faces, and each brick which lies against the boiling tubes preferably includes not only the boiling tube portion accepting channel but groove means extending, in use, in a direction from front to back of the core, which groove means defining with a planar face of a second brick at least one channel for accepting an element.
  • Each groove means preferably has two parallel grooves such that each pair of bricks which includes a second brick defines two element channels.
  • the core preferably comprises a plurality of brick and boiling tube units, each unit comprising a length of boiling tube, a pair of bricks lying against and surrounding, between them, the length of boiling tube, and a pair of second bricks, each lying outside and against a respective one of the boiling tube contacting bricks to define at least one element channel on each side of the boiling tube.
  • a preferred embodiment envisages a boiler tube to be three brick courses high, and with four boiling tubes, a total of forty-eight bricks. With such a height, a boiler with two boiling tubes would have twenty-four bricks, and a boiler with six boiling tubes would have seventy-two bricks.
  • the insulated casing preferably has a front insulation layer including slots through which the elements pass whereby contacts for connecting each element to an electrical supply lie on the side of the insulation remote from the core, in use.
  • Metal sheets for example of stainless steel, may be placed within and to cover the inner surfaces of the insulation on the side walls, base and top of the casing.
  • a further metal sheet again of stainless steel for example, may be placed in a vertical plane adjacent walls of the further bricks.
  • a header tank provided for the boiler has a capacity substantially larger than, and preferably at least double the capacity of the primary heating circuit.
  • the composition of bricks contacting a boiling tube is different from the composition of bricks not contacting a boiling tube, and the thermal conductivity of bricks contacting a boiling tube is greater than the thermal conductivity of bricks not contacting a boiling tube.
  • the composition of the bricks lying between elements may be magnetiteand the composition of bricks between an element and a boiling tube may be a mixture of magnetite and magnesite.
  • the proportion of magnetite to magnesite may be varied from boiler to boiler to achieve particular storage and heat release characteristics.
  • edge profiles of insulation layers around the core are such that there is a stepped edge profile on at least one of and preferably both insulation layers abutting at right angles.
  • FIG 1 shows a schematic layout of pipework in an electric boiler 10 according to the invention.
  • a primary heating circuit has four boiling tubes 11 surrounded in an assembled boiler by a core of heat storing bricks (not shown in Figure 1).
  • Vaporizable liquid preferably demineralised water
  • Water in the boiling tubes is turned to steam by heat in the core, the steam rising from the boiling tubes to a heat exchanger 13 through which liquid in a secondary heating circuit 14 flows.
  • Steam from the boiling tubes condenses in the heat exchanger 13 while giving up its heat to the secondary circuit 14, condensed steam returning via pipe 15 and motorised valve 16 to the pipes 12.
  • the motorised valve 16 is opened to allow the primary heating circuit to operate if there is a demand for heat from the secondary heating circuit 14.
  • the motorised valve 16 can be controlled, for example, by a room thermostat or other suitable means to indicate a need for heat.
  • a header tank 17 having a capacity approximately twice that of the primary heating circuit is able to feed liquid via the motorised valve 16 to the pipes 12.
  • Non-return valve 18 is provided to allow water to return to the header tank 17 when heat is not required from the boiler and the motorised valve 16 is therefore closed.
  • a drain cock 20 is provided to allow the header tank 17 to be drained.
  • a flow heater 23 is provided in the secondary heating circuit to provide direct heating in the secondary heating circuit if necessary.
  • a control system provides apportionment of heat supplied to the secondary heating circuit from the flow heater 23 or the heat exchanger 13. The presence of the flow heater 23 and the control system therefore is the subject of a co-pending Patent application of today's date.
  • Figure 12 shows the header tank 17 in isolation.
  • Venting takes place via a tube coupling 130 to which is connected a small bore tube 131.
  • a preferred bore for the tube 131 is 3mm but it will be appreciated that other small bore tubes may be used, typically in the range 1mm to 5mm although other bores may be appropriate in certain circumstances.
  • the tube 131 runs horizontally in an upper portion and bends downwards at point 132. In an assembled boiler, the tube 131 would exit from the boiler casing on the header tank side of the bend 132. From the bend 132, the tube 131 extends downwards and into a larger bore tube 133, in this embodiment of 8mm bore.
  • the larger bore tube could be of a different bore from 8mm, for example within the range 5mm to 10mm although other bores could be used.
  • the tube 131 extends to the lowest point of the larger bore tube 133, the larger bore tube 133 then rising in a S configuration to an outlet 134. In this way, there is a long condensation path for vapour trying to leave the tube 133, condensed vapour forming a liquid pool rising from the lowest point of the tube 133.
  • water is not the only liquid which could be used in the primary heating circuit although it is the preferred vaporizable liquid.
  • the advantage of this embodiment of a header tank according to the invention is that evaporation losses from the header tank are minimised, thereby reducing the frequency at which the header tank must be refilled.
  • Figure 2 shows a plan view of a core of bricks surrounding the four boiling tubes 11.
  • Figure 2 shows one course of heat storing bricks and, in the embodiment shown, there are sixteen bricks in each course, there being three courses of bricks in all making forty-eight bricks in the entire core.
  • Figure 3 being a section along the lines X-X in Figure 2 and Figure 4 being an exploded view of the bricks, two different shapes of brick are used.
  • the boiling tubes are arranged bricks 30 of a first shape having semi-circular section, vertical channels 32 formed therein such that two bricks 30 are able to surround a single boiling tube 11. Additionally, the shaped bricks 30 includes horizontal channels 31 which define with plain, cuboidal bricks 35 heating element channels 36. Into which elongate sheathed heating elements 40 can be slid. One such element 40 is shown in a channel 36 in Figure 3.
  • a heating element 40 is shown in more detail in Figures 5 and 6, the element 40 being of the sheathed type and being of elongate U-shape. As can be seen in Figure 3, the dimensions of the element channel 36 are such that the sheath of the element makes physical contact with curves of the channel 36 to provide enhanced heat transfer from the element to adjacent bricks. Legs of the U-shape element 40 are held together remote from the base of the U-shape by a mounting plate 41. In assembling a boiler 10, each heating element 40 is slid into a respective heating element channel 36 in the core, having first passed through a front, slotted insulation slab against which the mounting plate 41 lies adjacent in its final position.
  • This arrangement has the advantage that electrical connections 42 through which power is supplied to each heating element 40 are insulated from the main heat of the core.
  • the front insulation slab of the boiler 10 includes a number of elongate slots for engagement by the heating elements 40 corresponding to the number of heating elements 40 in the boiler 10 and at positions corresponding to the heating element channels 36 in the core. Wiring connections to the heating elements 40 are arranged conventionally and will therefore not be described in detail.
  • the material of the heat storing bricks 30 and 35 may be the same, for example magnetite or magnesite or a mixture of the two, magnesite having a higher thermal conductivity than magnetite which can be advantageous in transferring heat stored in the core more rapidly to the boiling tubes 11. It is also possible and can be advantageous for particular boiler demands to form the shaped bricks 30 of a material having higher thermal conductivity than the plain bricks 35. In the configuration described, it is the shaped bricks 30 which lie against the boiling tubes and an increase in thermal conductivity of the shaped bricks 30 results in easier passage of heat to the boiling tubes 11. Where the bricks are made of a mixture of magnetite and magnesite, an increase in thermal conductivity can be achieved by increasing the proportion of magnesite in the bricks.
  • Forming the two sorts of bricks of different compositions is economically sensible since magnesite is significantly more expensive than magnetite, the materials having similar heat storing capacities but different thermal conductivities.
  • a further advantage of having the shaped bricks 30 with a higher thermal conductivity is that it provides a better direct conduction path from the elements 40 to the boiling tubes 11 should it be necessary to boost the core temperature while heat is actually being drawn from the core in order to provide steam for the heat exchanger 13 to heat the secondary circuit 14. Efficiency of such an operation is thus increased.
  • the number and type of bricks 30 and 35 employed allows filling of a boiler casing to be achieved from the front of the casing.
  • the core is assembled by first placing the shaped bricks 30 of a particular course around the boiling tubes 11, thereby leaving a space the width of two plain bricks 35 between the shaped bricks and a space the width of one plain brick 35 between respective shaped bricks 30 and the casing side walls. This means that the respective course of bricks can be completed simply by sliding in plain bricks 35 from the front.
  • the front insulation slab is placed in front of the core and the elements 40 are simply slid through the front insulation slab and between the bricks in respective element channels 36.
  • assembly is achieved entirely from the front and servicing of elements, should there be a failure, is likewise achieved through the front of the casing. This enables the boiler to be fitted under a work surface and yet be serviceable.
  • Equipment above the core such as the header tank, heat exchanger and flow heater are also arranged to be accessible from the front.
  • These protective sheets have an additional advantage that, at high temperatures the sheets tend to bow and thus force inwardly the bricks of the core with which they are in contact. This has an effect of improving physical contact between the shaped bricks and the boiling tubes and also the bricks surrounding the heating elements 40.
  • An additional possibility is to provide a thin sheet of metal, for example stainless steel, extending vertically from front to rear of the core. This sheet acts initially as a shim and also bows at high temperatures to enhance the effect described above with the protective side sheets.
  • Figure 8 shows the stepped profiles 56 of the side insulation slabs 53 and 54 and that the stepped arrangement continues to the top of the side insulation slabs 53, 54 to mate with stepped profile in top insulation 57.
  • Figure 9 shows stepped mating of top and rear insulations 57 and 50 respectively and the mating of front insulation 55 with the top insulation 57.
  • Figures 10 and 11 show the base insulation slab 60 having a peripherally stepped profile shown in Figure 11.
  • Four holes 61 are provided for allowing the base insulation slab 60 to slide over the boiling tubes 11 during assembly.
  • An advantage of this embodiment of the invention is that installation and maintenance of the boiler can be achieved from the front of the boiler.
  • Installation can be effected by plumbing in the boiler to the secondary circuit, which may be in existence already or may be a new system, before the core is built in the casing and then building the core around the boiling tubes and in the remainder of the casing space from the front of the casing.
  • the elements are then inserted from the front, after the front insulation is in place, and the casing is then closed for the front cover. Should an element need to be replaced, the front cover is removed, the non-functioning element disconnected and slid out and a replacement element slid in and connected.
  • the flow heater is arranged so that its element can be replaced from the front also.
  • the insulation profiles minimise heat losses at corners.
  • the capillary bleed from the heat exchanger to the header tank allows convenient flushing of air when use of the boiler is started in a simple fashion and with negligible subsequent steam loss.
  • Providing the header tank with a capacity substantially larger than the capacity of the primary heating circuit means that topping up of the header tank can be infrequent, it being desirable to provide for topping up during an annual maintenance inspection of the boiler.
  • Fig. 13 which shows an alternative pipework layout for a boiler, the pipework includes boiling tubes (64), a heat exchanger (66) and an auxiliary flow heater (68).
  • a return pipe (70) extends from the primary heating circuit to the header tank (72). The top of the return pipe is above the water level in the header tank at all times so that water cannot pass from the header tank down the return pipe (70).
  • the motor valve (74) is closed to prevent water entering the primary heating circuit from the header tank (72) and the solenoid valve (76) between the heat exchanger and the header tank (72) is also closed.
  • Pressure within the primary heating circuit then forces the water/steam in the primary circuit up the return pipe (70) and into the header tank (72). No water from the header tank can pass down the return pipe (70) since the upper end of the pipe is above the water level in the header tank (72).
  • the header tank (72) includes a sensor (78) to determine the water level in the tank (72) and hence when additional water should be added via the inlet (80). When the water level in the header tank (72) has fallen below a predetermined level, the sensor (78) is triggered and a light illuminates on the control panel of the boiler appliance.
  • the header tank is made of plastics material which enables it to withstand changes in internal pressure and temperature by virtue of its suitable properties. Further, the heat exchanger is more efficient if it is made from copper rather than steel, and water can be drained from the heat exchanger more easily if the exchanger is angled slightly with the drain pipe (82) extending from its lower end.

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  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Central Heating Systems (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (14)

  1. Elektrischer Boiler, in dem eine Flüssigkeit durch einen Wärmespeicherkern erwärmt wird, welcher Kern aus einer Vielzahl von ersten Wärmespeichersteinen (30) besteht und durch elektrisch betriebene Heizelemente (40) erhitzt wird, wobei Wärme von dem Kern zu einem primären Wärmekreislauf übertragen wird, in dem die Flüssigkeit umgewälzt wird, und der primäre Wärmekreislauf eine Vielzahl von Siederohren (11) aufweist, die sich im wesentlichen vertikal in einem isolierten Gehäuse erstrecken, das den Kern umgibt und eine Frontfläche, eine rückwärtige Fläche und zwei Seitenflächen besitzt, und die Siederohre in wenigstens einer Reihe angeordnet sind, die sich im wesentlichen parallel zu der Frontfläche erstreckt, und die ersten Steine (30) an den Siederohren (11) anliegen und Profile auf der Seitenfläche haben, die so ausgebildet sind, um Kanäle (31) zum Aufnehmen eines Teils eines Siederohres (11) vorzusehen, und eine Kombination von derartigen ersten Steinen (30) einen Abschnitt der Siederohre (11) umgibt, dadurch gekennzeichnet, daß die Frontfläche geöffnet werden kann, um eine Installation des Kerns und den Zugriff auf diesen zu ermöglichen, und daß sowohl zwischen den Seitenflächen des Gehäuses und den ersten Steinen (30) als auch zwischen den ersten Steinen (30) zweier benachbarter Rohre derselben Reihe zweite Steine (35) angeordnet sind, die mit keinem Teil der Siederohre (11) in Eingriff sind.
  2. Boiler nach Anspruch 1, bei welchem die Steine (30, 35) in einem zusammengesetzten Kern Kanäle (36) begrenzen, die sich von der Vorder- bis zur Rückseite des Boilers erstrecken, um die Heizelemente (40) aufzunehmen, wobei die Heizelemente (40) länglich sind und in den Kern eingelegt werden, indem sie von der Vorderseite des Kerns in die Kanäle (36) eingeschoben werden.
  3. Boiler nach Anspruch 2, bei welchem das Querschnittsprofil der Kanäle (36) für die Elemente und der Querschnitt der Heizelemente (40) so ausgebildet sind, daß ein Kontakt zwischen einem Bereich der äußeren Oberfläche von jedem Element (40) und den benachbarten Steinen (30, 35) erhalten wird.
  4. Boiler nach einem der vorhergehenden Ansprüche, bei welchem die ersten Steine (30), die an den Siederohren (11) anliegen, ein zu den zweiten Steinen (35) unterschiedliches Profil aufweisen.
  5. Boiler nach Anspruch 4, bei welchem die zweiten Steine (35) ebene Flächen aufweisen, und jeder Stein (30), der an den Siederohren (11) anliegt, nicht nur den Kanal (31) zur Aufnahme eines Abschnitts eines Siederohres sondern auch nutartige Mittel (32) beinhaltet, die sich während des Gebrauchs in einer Richtung von der Vorder- zur Rückseite des Kerns erstrecken, wobei die nutartigen Mittel mit einer ebenen Fläche eines zweiten Steins (35) wenigstens einen Kanal (36) zur Aufnahme eines Elementes (40) begrenzen.
  6. Boiler nach Anspruch 5, bei welchem jedes nutartige Mittel (32) zwei parallele Nuten besitzt, so daß jedes Paar Steine (30, 35), das einen zweiten Stein (35) beinhaltet, zwei Kanäle (36) für die Elemente begrenzt.
  7. Boiler nach einem der vorhergehenden Ansprüche, bei welchem der Kern eine Vielzahl von Einheiten aus Steinen und Siederohren aufweist, wobei jede Einheit einen Abschnitt eines Siederohres (11), ein Paar Steine (30), die an dem Abschnitt des Siederohres (11) anliegen und zwischen ihnen den Abschnitt des Siederohres (11) umgeben, und ein Paar von den zweiten Steinen (35) aufweist, die jeweils auf der Außenseite von und an den entsprechenden Steinen (30), die in Kontakt mit dem Siederohr stehen, liegen, um wenigstens einen Kanal (36) für ein Element auf jeder Seite des Siederohres (11) zu begrenzen.
  8. Boiler nach einem der vorhergehenden Ansprüche, bei welchem der Boiler zwei Siederohre (11) und vierundzwanzig Steine (30, 35) oder vier Siederohre (11) und achtundvierzig Steine (30, 35) oder sechs Siederohre und zweiundsiebzig Steine (30, 35) aufweist.
  9. Boiler nach einem der vorhergehenden Ansprüche, bei welchem innerhalb des Gehäuses Metallplatten angeordnet sind, die die inneren Oberflächen der Isolation an den Seitenwänden, der Unterseite und der Oberseite des Gehäuses bedecken.
  10. Boiler nach einem der vorhergehenden Ansprüche, bei welchem ein Wasserkasten (17) für den Boiler vorgesehen ist, der ein Aufnahmevermögen besitzt, das mindestens doppelt so groß wie das Aufnahmevermögen des primären Wärmekreislaufs ist.
  11. Boiler nach einem der vorhergehenden Ansprüche, bei welchem die Wärmeleitfähigkeit der Steine (30), die in Kontakt mit einem Siederohr (11) stehen, größer als die Wärmeleitfähigkeit der Steine (35) ist, die nicht in Kontakt mit einem Siederohr (11) stehen.
  12. Boiler nach Anspruch 11, bei welchem die Zusammensetzung der Steine, die zwischen den Elementen (40) liegen, aus Magnetit ist, und die Zusammensetzung der Steine (30) zwischen einem Element (40) und einem Siederohr (11) eine Mischung aus Magnetit und Magnesit ist.
  13. Boiler nach einem der vorhergehenden Ansprüche, bei welchem das isolierte Gehäuse eine Vielzahl von Isolierschichten (50 - 57) beinhaltet.
  14. Boiler nach Anspruch 13, bei welchem die Kantenprofile der Isolierschichten (50 - 57) so ausgebildet sind, daß ein abgestuftes Eckprofil bei wenigstens einer der Isolierschichten vorhanden ist, die im rechten Winkel aneinander anstoßen.
EP90900240A 1988-12-06 1989-12-06 Elektrisch beheizter wärmespeicherkessel Expired - Lifetime EP0447438B1 (de)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
GB8828421 1988-12-06
GB888828422A GB8828422D0 (en) 1988-12-06 1988-12-06 Improvements in boilers
GB888828421A GB8828421D0 (en) 1988-12-06 1988-12-06 Electric boiler
GB8828422 1988-12-06
GB8901281 1989-01-20
GB898901281A GB8901281D0 (en) 1989-01-20 1989-01-20 Improvements in or relating to boilers
GB898922306A GB8922306D0 (en) 1989-10-04 1989-10-04 Improvements in or relating to boilers and controls therefor
GB8922306 1989-10-04
PCT/GB1989/001459 WO1990006473A2 (en) 1988-12-06 1989-12-06 Electrical heat storage boiler

Publications (2)

Publication Number Publication Date
EP0447438A1 EP0447438A1 (de) 1991-09-25
EP0447438B1 true EP0447438B1 (de) 1995-03-29

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EP19900900241 Withdrawn EP0533658A1 (de) 1988-12-06 1989-12-06 Elektrische wasserheizvorrichtung und steuerungen dafür
EP90900240A Expired - Lifetime EP0447438B1 (de) 1988-12-06 1989-12-06 Elektrisch beheizter wärmespeicherkessel

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Application Number Title Priority Date Filing Date
EP19900900241 Withdrawn EP0533658A1 (de) 1988-12-06 1989-12-06 Elektrische wasserheizvorrichtung und steuerungen dafür

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EP (2) EP0533658A1 (de)
DE (1) DE68921988T2 (de)
ES (1) ES2070310T3 (de)
WO (2) WO1990006477A2 (de)

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Publication number Priority date Publication date Assignee Title
SE509732C2 (sv) * 1996-06-18 1999-03-01 Tsp Medical Ab Ånggenerator med reglerad till- och bortförsel av vatten

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT234236B (de) * 1962-12-27 1964-06-25 Veitscher Magnesitwerke Ag Aus einem Dreiphasennetz zu speisender elektrischer Speicherofen mit mehreren Widerstandsheizkörpern
BE657497A (fr) * 1964-12-23 1965-06-23 Acec Dispositif de commande de la résistance chauffante d'un poêle à accumulation
FR1434485A (fr) * 1965-03-24 1966-04-08 Witte Haustechnik Gmbh Générateur de vapeur d'eau à fonctionnement périodique, chauffé électriquementet pourvu d'un accumulateur de chaleur
DE1579864A1 (de) * 1965-09-02 1970-08-27 Elektrowaerme Inst Essen E V Elektrische Speicherheizung
DE1812340A1 (de) * 1968-12-03 1970-06-25 Zenkner Dr Ing Kurt Nachtstromwaermspeicherofen
GB1296992A (de) * 1969-03-20 1972-11-22
GB1261649A (en) * 1969-06-10 1972-01-26 Potterton Internat Ltd Control means for electrical storage heaters
GB1394745A (en) * 1972-06-13 1975-05-21 Potterton Int Ltd Storage heaters
CH635187A5 (fr) * 1980-04-15 1983-03-15 Battelle Memorial Institute Appareil de chauffage.

Also Published As

Publication number Publication date
WO1990006473A3 (en) 1990-08-23
EP0447438A1 (de) 1991-09-25
DE68921988T2 (de) 1995-08-03
DE68921988D1 (de) 1995-05-04
EP0533658A1 (de) 1993-03-31
WO1990006477A3 (en) 1990-08-23
WO1990006477A2 (en) 1990-06-14
WO1990006473A2 (en) 1990-06-14
ES2070310T3 (es) 1995-06-01

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