PORTABLE HEAT SOURCE

Description

State of the art

[0001] The invention relates to a portable heating source, in particular in the form of a hot plate and / or a warming plate and / or an oven.

[0002] It is common to use portable heating sources outdoors in cooler temperatures, for example in the form of gas-powered patio heaters, as well as grills and gas stoves when camping. These require the storage of gas cartridges or charcoal. Indoor use is not recommended due to the exhaust fumes produced when burning gas or charcoal.

[0003] DE102015012017A1 discloses a device for tempering baby bottles with a PCM material with latent heat and a melting point of 37°C.

[0004] German patent DE102013114507B3 discloses a device that provides a drinking temperature of 60°C for hot beverages or a temperature of 30°C for baby food. A mixture containing stearic acid as a PCM material with a melting point of 69°C is used.

[0005] US20180084943A1, US20170042373A1, and US20160242598A1 disclose a device resembling a drinking vessel in which a PCM material is used to cool excessively hot beverages or food. Adjustable heating elements are provided to warm cool or cold beverages. Paraffin is used as the PCM material for cooling.

[0006] EP2997865A2 describes a steam cooking insert for a food processor in which water is used as a PCM material. Disclosure of the invention

[0007] The object of the invention is to provide a portable heating source that is free of combustion gases when in use and can be used both indoors and outdoors.

[0008] The problem is solved by the features of the independent claim. Favorable embodiments and advantages of the invention become apparent from the further claims, the description, and the drawing.

[0009] A portable heating source in the form of a hot plate and / or a warming plate and / or an oven is proposed, comprising a heating core containing at least one phase change material in an enclosure, wherein the heating core is at least partially surrounded by thermal insulation. The phase change material comprises a metallic or semi-metallic phase change material with a phase change temperature of at least 500°C.

[0010] The heating core represents a thermal storage device that enables high-temperature heat storage. Specifically, heat storage with the metallic phase change material, also known as mPCM, occurs via latent and sensible heat. During the phase transition, the metallic phase change material can absorb thermal energy in the solid phase without a temperature change until it is completely molten, or release thermal energy in the liquid phase until it is completely solidified.

[0011] Metallic phase change materials (mPCMs) allow for the storage of heat, and in particular latent and sensible heat, for extended periods. Specifically, heat can be stored at high temperatures, for example, at least 500°C and especially at approximately 600°C to 650°C. Depending on the type of mPCM, heat can be stored at temperatures up to 1500°C. For example, pure silicon with a phase change temperature of 1414°C or silicon carbide (SiBs) with a phase change temperature of 1385°C can be used.

[0012] Depending on the thermal loading state, the metallic phase change material exists in either a liquid or solid state. A suitable phase change material is, for example, AlSi 12 .

[0013] For example, if AlSi 12 is used as a metallic phase change material in the temperature range of 25°C to 600°C, it has an energy density of approximately 300 Wh / kg or approximately 795 Wh / l.

[0014] By comparison, hot water bottles, for example, achieve relatively low energy densities due to the use of relatively small temperature ranges. The energy density of a water-filled hot water bottle heated from 25°C to 95°C is, for instance, around 80 Wh / kg or 80 Wh / l.

[0015] As an advantage over systems that use gas as fuel, such as patio heaters or camping stoves, fossil fuels can be avoided. In any case, at least local emission-free operation is guaranteed, making it suitable for both indoor and outdoor use.

[0016] In the case of the regeneration of the metallic phase change material, in which the phase change material is melted, charging with electrical energy from renewable energy sources or charging using concentrated solar radiation can take place, so that global emission-free operation can also be advantageously achieved.

[0017] The mobile provision of thermal energy via a transportable heating source is particularly advantageous. This mobile provision can be achieved by charging the heating core of the heating source at a specific location and then discharging this heat at another location where no charging infrastructure is available.

[0018] A significant time lag between the charging and dissipation of thermal energy is also possible. The discharge of the metallic phase material occurs passively, i.e., due to convection, conduction, or radiation resulting from a temperature gradient.

[0019] The mobile heating source can be used to prepare or heat food, or to directly heat people or rooms in buildings, tents, or caravans.

[0020] A heat source with a high energy density can be provided, which is advantageous.

[0021] In a favorable embodiment, the phase change material of the portable heating source can comprise a metallic or semi-metallic alloy with one or more of the components aluminum, silicon, copper, magnesium, boron, zinc, in particular an AlSi alloy, preferably AlSi 12. Favorable alloys are eutectic alloys and intermetallic compounds, for example various silicides, in which the phase change takes place with the absorption or release of latent heat.

[0022] Binary alloys or ternary alloys and alloy systems with more than three components, with a eutectic composition or an intermetallic composition with at least one of the above-mentioned components Al, Si, Cu, Mg, B, Zn are particularly advantageous.

[0023] Some advantageous examples among a multitude of known such systems are AlSi 12 with Ts=577°C; AlCu 27 Si 5 with Ts=522°C; AlMg 28 Zn 13 with Ts=461°C; Al 61 Mg 39 with Ts=466°C; MgZn 52 with Ts=346°C; ZnAl 4 Mg 2 with Ts =351°C; CuCa 30 Al 14 with Ts=294°C, where Ts is the respective phase change temperature.

[0024] Suitable materials can be selected for different temperature ranges.

[0025] In a favorable embodiment, a heat conduction device can be arranged within the enclosure, particularly within a region containing phase-change material. The heat conduction device can advantageously facilitate the supply of heat to or the release of heat from the metallic phase-change material, ensuring stable thermal conditions, for example, in the heating core during charging with solar radiation and in the area of ​​the heat transfer surface, e.g., a hotplate, during discharging from the heating core. The heat conduction device can, for example, have heat-conducting fins that project into the phase-change material.

[0026] With a favorable design, the phase change material can have a larger coefficient of thermal expansion than the material of the enclosure.

[0027] Alternatively or additionally, the phase change material can be in thermal contact with the heat conducting device, at least in certain areas. In particular, the phase change material can have a higher coefficient of thermal expansion than a material of the heat conducting device, at least in the contact area with the heat conducting device. Close thermal contact between the phase change material and / or the housing or the heat conducting device can be ensured.

[0028] In a favorable embodiment, the housing and / or the heat conducting element can be made of fiber-reinforced ceramic material. In particular, the housing and / or the heat conducting element can be made of a fiber-reinforced non-oxide ceramic material. The fiber-reinforced non-oxide ceramic material can, in particular, be made of carbon fiber-reinforced carbon and / or carbon fiber-reinforced silicon carbide and / or silicon carbide fiber-reinforced carbon and / or silicon carbide fiber-reinforced silicon carbide (SiC).

[0029] Other possible housing materials are ceramics, for example aluminum oxide, zirconium oxide, boron nitride, silicon oxide, aluminum nitride, silicon carbide, boron carbide, graphite and the like.

[0030] This allows for a simple reduction in the coefficient of thermal expansion compared to the metallic phase-change material. The enclosure can be advantageously constructed using lightweight materials. Fiber reinforcement enables the creation of particularly thin enclosure walls. Such an enclosure is therefore advantageously suited for housing materials that require repeated heating at high rates and subsequent cooling at high rates.

[0031] Suitable enclosure materials offer high thermal shock resistance, high oxidation resistance, high mechanical stability, and especially high corrosion resistance. This allows for long-term stable enclosure of phase-change materials, which are at least temporarily molten metals.

[0032] By enclosing the molten metal with a suitable wall material, it is possible to keep it stable over the long term.

[0033] This results in high corrosion resistance. Therefore, the enclosure can be used in conjunction with molten metals whose temperature can be in the range of, for example, up to approximately 600°C or 650°C or even up to 1500°C.

[0034] The metallic phase change material can be enclosed in a single enclosure chamber, or enclosed in multiple enclosure segments, or macroencapsulated, or microencapsulated.

[0035] In principle, the molten metal contained within the enclosure can remain in a liquid state continuously, or it can remain in a liquid state only temporarily. For example, the enclosure might contain a metallic phase-change material that is in a liquid state during thermal charging and in a solid state after thermal discharge. It can then, for example, store both latent and sensible heat.

[0036] It is advantageous if the wall thickness of a wall section made of fiber-reinforced SiC material is at least 1 mm, particularly at least 2 mm, and especially at least 2.5 mm, and is, for example, approximately 3 mm. Preferably, the wall thickness is at most 5 mm. This allows for a mechanically stable wall with high thermal shock resistance. Furthermore, the wall thickness can be kept relatively small, enabling the container to be designed with a low weight.

[0037] In a favorable design, energy can be supplied to the phase change material by electrical energy and / or solar radiation. In this way, the phase change material can be charged.

[0038] In a favorable design, the heat conduction device can be coupled to or connectable to a heating device, or it can include a heating device. In particular, the heating device can be an electric heating device. Optionally, resistance heating or inductive heating can be provided. Furthermore, charging by means of concentrated solar radiation can be carried out alternatively or additionally.

[0039] Depending on the design, the thermal insulation can, for example, consist of pyrogenic silicon dioxide. Other materials, such as mineral wool, calcium silicate, ceramic fiber (e.g., calcium magnesium silicates), mica, or vacuum insulation, can also be used to advantage. Other materials that have higher thermal conductivity but are less expensive can also be used as an option.

[0040] In a favorable design, when the portable heating source is configured as a hot plate, the thermal insulation can have an opening through which a heat transfer surface of the heating core is accessible. Advantageously, the opening can be closed by a thermally insulating cover, such as a lid with a handle or similar. The lid can be removed to heat a container or to allow sunlight to warm the metallic storage material. Advantageously, the lid can be made of the same material as the thermal insulation surrounding the heating core.

[0041] The heat transfer surface can itself serve as a support surface and contact surface for a vessel, or an indirect coupling between the vessel and the heat transfer surface can be provided, for example via plate-shaped adapters that are placed on the heat transfer surface of the heating core.

[0042] In a favorable design, an adjustment mechanism can be provided to set a variable distance between the heat transfer surface and a heating surface. The vessel to be heated can be placed on the support surface of the adjustment mechanism, which serves as the heating surface. Depending on the distance of the support surface, the vessel can be heated to a greater or lesser degree.

[0043] This allows for different cooking levels on the hob. Furthermore, the adjustment mechanism can also take the form of a grill rack, where the food can be placed more or less close to the heat transfer surface.

[0044] With a suitable design, the opening can accommodate interchangeable adapters in its intended use. In particular, different adapters can have different heights and / or distances to the heating element and / or different thermal conductivities and / or different diameters. This allows for the reproducible setting of different cooking levels or the selection of suitable adapters for different sized vessels without wasting heat from the heating source.

[0045] In a favorable embodiment, when the portable heating source is configured as a heat-retaining plate, the heating core can be arranged within a cavity in the thermal insulation, which can be divisible. Advantageously, the heating core can be partially exposed by opening the thermal insulation to heat the metallic phase-change material. The heating core of the heat-retaining plate can be relatively small and particularly well insulated to maintain a moderately elevated temperature on its outer surface for an extended period. Advantageously, the temperature on the outer surface can be limited to prevent the risk of injury.

[0046] In a well-designed configuration, the hot plate or warming plate can have one or more handles. The portable heating element can be easily carried from one location to another, for example, between a location where the metallic phase-change material is heated and a location where the heating element is used for cooking or keeping food warm.

[0047] In a favorable design, the heating core can be formed as a substantially flat disc whose diameter is larger than its height. This allows for a compact and handy form of the heating source. When charging with concentrated solar radiation via a parabolic mirror, it can be advantageous to minimize shading of the mirror. In this case, a cylindrical shape with a height equal to or greater than the diameter can be advantageous.

[0048] With a favorable design, a portable heating source configured as a stove can be housed in a mobile transport cart. This allows even larger units to be easily moved from one location to another. The stove can be flexibly used to heat a building, such as a garden shed or hiking hut, or a tent or caravan.

[0049] In a well-designed configuration, the thermal insulation can include a cavity in which the heating element is located, with the first layer of insulation surrounded by a second layer. The temperature on the outside of the oven can then be limited to a level safe for humans. Alternatively, only one layer of thermal insulation can be used.

[0050] In a well-designed configuration, a recess can be incorporated into the first and / or second layer of thermal insulation to serve as a warming compartment. This allows, for example, the heating of water or other beverages, the slow cooking of food, or the keeping of food warm.

[0051] With a favorable design, the heating core can be shaped like a cylinder whose diameter is smaller than its height. This advantageously creates a space-saving heating source.

[0052] A mobile heating source is advantageously provided, which can be charged electrically or via concentrated solar radiation. Electrical charging results in a locally emission-free system. With the expansion of renewable energies and the further increase in their share in the energy mix, an increasingly globally emission-free system for the mobile provision of thermal energy can also be made available. In the version charged by concentrated solar radiation, the resulting system can already be operated entirely with renewable energies. At the same time, the transportable heating source provides significantly higher energy densities than currently available mobile heat sources that do not rely on fossil fuels.

[0053] The portable heating source can be manufactured in affordable dimensions and with a low weight.

[0054] Portable heating elements with a storage unit, including attachments, intended to be carried by people, should not exceed a weight of 15 kg to 55 kg, but preferably 10 kg to 30 kg. Portable heating elements intended to be transported using carts or trolleys should not exceed a total mass of 55 kg to 500 kg, corresponding to the maximum load capacity of heavy-duty hand trucks. Depending on the application, storage units can also be implemented with a total mass of less than 15 kg. The required volume is primarily determined by the storage capacity required for the specific application, the phase change temperature, and the permissible self-discharge rate. In the simplest form, discharge begins immediately after charging, thus reducing the need for insulation.The insulation can be designed, for example, to minimize storage losses or to limit the surface temperature, especially for handling reasons.

[0055] For a cost-effective design of the heating element as a cooktop, it is assumed that cooking will take place for 2 hours at an average power output of 1 kW, requiring a total storage capacity of 2 kWh. This necessitates approximately 7 kg of storage material. With the enclosure, insulation, and any other components, the heating element can then reach a total mass of approximately 10 to 12 kg. 7 kg of storage material occupies a volume of approximately 2.7 liters. This corresponds to a cylindrical disc with a diameter of 22 cm for a medium-sized cooktop and a height of about 7 cm. With an insulation thickness of approximately 3 cm and an assumed enclosure thickness of 1 cm in all directions, this results in a cylindrical disc with a diameter of 30 cm and a height of 15 cm. This corresponds to a total volume of 10.6 liters. The insulation would have a volume of approximately 6 liters, thus comprising about 57% of the total volume.

[0056] For an initial application as a stove similar to a portable heater, a storage capacity of approximately 4 kWh is required for a heating output of 0.5 kW over a period of about 8 hours, assuming a favorable design. This requires approximately 14 kg of storage material, which has a volume of approximately 5.4 liters.

[0057] With its housing, electric heater, and insulation, but without a transport frame, the heating plate weighs approximately 22 to 25 kg. A cylindrical container with a 1 cm thick housing and 4 cm thick insulation could therefore have, for example, a diameter of 26 cm and a height of 37 cm. This would give the container a total volume of approximately 20 liters. The insulation would have a volume of approximately 12 liters, representing about 60% of the total volume.

[0058] For a second application as a heater similar to a patio heater, assuming an output of approximately 10 kW over a duration of 8 hours, this results in a capacity of 80 kWh. This requires about 280 kg of storage material, which has a volume of approximately 108 liters. Assuming a 1 cm thick enclosure and 4 cm thick insulation, this results in a cylinder with, for example, a diameter of 50 cm and a height of 96 cm. The container thus has a total volume of approximately 189 liters. The insulation would have a volume of approximately 60 liters, representing about 32% of the total volume.

[0059] In principle, insulation can be made thinner, since the radiated heat from the heating panel is utilized both when used as a heating plate and as a stove. The proportion of insulation to the total volume, and also the total volume of the storage unit, can be reduced accordingly. drawing

[0060] Further advantages become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations. They show, for example:

[0061] Fig. 1 in a sectional view of a hotplate according to an embodiment of the invention with a covered heat transfer surface; Fig. 2 in a sectional view of a hotplate according to an embodiment of the invention with a heat conducting device in the heating core; Fig. 3 in a sectional view of a hotplate according to an embodiment of the invention with a carrying frame with handles; Fig. 4 in a sectional view of a hotplate according to an embodiment of the invention with an adjustment device for changing the distance to a heat transfer surface of a heating core; Fig. 5 in a sectional view of a hotplate according to an embodiment of the invention with an adapter for heating a vessel; Fig. 6 the hotplate according to Figure 5with a taller adapter for heating a vessel; Fig. 7 in a sectional view of a hotplate according to an embodiment of the invention during the thermal charging of a heating core; Fig. 8 in a sectional view of a warming plate according to an embodiment of the invention; Fig. 9 in a sectional view of an oven according to an embodiment of the invention; Fig. 10 in a sectional view of an oven according to an embodiment of the invention with a warming area; Fig. 11 schematically of the oven according to Figure 10 in a building or tent. Embodiments of the invention

[0062] In the figures, similar or equivalent components are numbered with the same reference symbols. The figures merely show examples and are not to be understood as limiting.

[0063] The directional terminology used below, including terms like "left," "right," "above," "below," "in front," "behind," "after," and the like, serves only to improve the understanding of the figures and is in no way intended to limit their generality. The components and elements depicted, their interpretation, and their use may vary according to the considerations of a person skilled in the art and be adapted to the specific applications.

[0064] The Figures 1 to 7 The figures show exemplary embodiments of a portable heating source according to the invention in the form of hot plates 100. The hot plates 100 are used for preparing food.

[0065] Figure 1Figure 1 shows a sectional view of a hotplate 100 according to an embodiment of the invention with a covered heat transfer surface 104. The hotplate 100 has a disc-shaped heating core 10. In this example, the heating core 10 consists of an enclosure 40 containing a metallic phase-change material 50. The cross-section of the heating plate 10 can be round or rectangular.

[0066] The phase change material 50 has a phase change temperature of at least 500°C. The phase change material 50 can, for example, be a silicide alloy, in particular AlSi 12. This material has a phase change temperature of approximately 577°C, at which the material melts at a constant temperature when energy is supplied, or solidifies when energy is removed.

[0067] In one embodiment, the housing 40 can be formed from a ceramic material, particularly a fiber-reinforced one, such as silicon carbide, or also aluminum oxide or graphite. However, other suitable materials are also conceivable. The wall thickness can be very thin, for example 1 mm, in particular at least 2 mm, and in particular at least 2.5 mm, and is, for example, approximately 3 mm. Preferably, the wall thickness is at most 5 mm.

[0068] Preferably, the coefficient of thermal expansion of the metallic phase change material 50 is greater than that of the housing material 40.

[0069] The heating core 10 is arranged in a recess 102 of thermal insulation 70 and is surrounded by it, for example, on three sides. The thermal insulation 70 has an opening 114 through which a heat transfer surface 104 of the heating core 10 is accessible in the intended operating state. The opening 114 can be covered by a cover 116, for example, a lid with a handle. The cover 116 is removed to use the hotplate 100.

[0070] Thermal insulation of 70 can, for example, be pyrogenic silicon dioxide. Alternatively, conventional insulation materials can also be used effectively, such as ceramic fiber-based insulation materials like mineral wool, calcium-magnesium silicate fiber, calcium silicate, microporous insulation, still air, vacuum insulation panels, and the like.

[0071] The heating core 10 releases the heat of the phase change material 50 essentially via the heat transfer surface 104.

[0072] The heat transfer surface 104 serves as a support surface for a vessel to be heated. Optionally, an adapter can be placed on the heat transfer surface 104 of the heating core 10, and its upper surface can serve as both a support and heating surface on which the vessel can be placed. This allows the heat transfer between the heating core 10 and the vessel to be controlled.

[0073] Figure 2 Figure 1 shows a sectional view of a hotplate 100 according to a further embodiment of the invention. The construction of the hotplate 100 corresponds to that shown in Figure 2. Figure 1 , to which reference will be made to avoid unnecessary repetition. In the design of the Figure 2A heat-conducting device 20 is additionally arranged in the phase-change material 50. The heat-conducting device 20 can have a plurality of unspecified fins, which serve to introduce heat into the heating core 10 or to dissipate heat from the heating core 10 with the phase-change material 50 and can contribute to a homogeneous temperature distribution. The fins extend, for example, parallel to the vertical axis of the hotplate 100. If the hotplate 100 has a circular cross-section, the fins can form concentric rings. Other geometries are also possible.

[0074] The heat conducting device 20 can be made of the same material as the housing 40.

[0075] Figure 3 Figure 1 shows a sectional view of a hotplate 100 according to a further embodiment of the invention. The construction of the hotplate 100 corresponds to that shown in Figure 2. Figure 2, which will be referenced to avoid unnecessary repetition.

[0076] The hotplate 100 also features a carrying frame 108 with handles 106, in which the thermal insulation 70 and the heating core 10 are held. This allows the hotplate 100 to be carried comfortably and safely.

[0077] Figure 4 Figure 1 shows a sectional view of a hotplate 100 according to a further embodiment of the invention. The construction of the hotplate 100 corresponds to that shown in Figure 2. Figure 3 , which will be referenced to avoid unnecessary repetition.

[0078] In this embodiment, the cooktop 100 has an adjustment device 110 for changing the distance between a storage surface 112 and a heat transfer surface 104 of the heating core 10. The adjustment device 110 is inserted into the opening 114 of the thermal insulation 70.

[0079] The support surface 112 can be placed at different heights on the adjustment device 110. By adjusting the distance, the heat transfer from the heating core 10 to the vessel can be influenced.

[0080] Alternatively, the adjustment device 110 can be used as a grill attachment, allowing food to be cooked at different distances from the heating core 10.

[0081] In addition, the hotplate 100 in this configuration has an electric heating element 60 beneath the heating core 10. This can be a resistance heater or an induction heater and can be charged via a charging station.

[0082] Figure 5 Figure 1 shows a sectional view of a hotplate 100 according to a further embodiment of the invention. The construction of the hotplate 100 corresponds to that shown in Figure 2. Figure 3 without adjustment device 110; on Figure 3 Reference is made to avoid unnecessary repetition.

[0083] In the opening 114 of the thermal insulation 70, an adapter 118 is placed on the heat transfer surface 104, on which a vessel 120 is placed.

[0084] Optionally, the heat transfer surface 104 can be arranged in a height-adjustable manner with vertical pins in corresponding hollow cylindrical recesses in the phase change material 50.

[0085] The pins can be part of the housing 40 and thus form a sealed housing chamber. The pins of the heat transfer surface 104 can be contacted with the hollow cylinders, for example, either by a precise fit or by additional thermal paste.

[0086] Figure 6 The hotplate shows 100 after Figure 5A taller adapter 118 is used on the heat transfer surface 104 to heat the vessel 120. Different adapters 118 allow the heat transfer from the heating core 10 to the vessel 120 to be specifically controlled. In this way, for example, different cooking levels can be set, even if the heating core 10 maintains a constant temperature.

[0087] Figure 7 Figure 1 shows a sectional view of a hotplate 100 according to a further embodiment of the invention. The construction of the hotplate 100 corresponds to that shown in Figure 2. Figure 3 , which will be referenced to avoid unnecessary repetition.

[0088] In this embodiment, the thermal charging of the heating core 10 does not occur via an electric heating device 60, but rather via radiant heat, in particular via concentrated solar radiation. This acts on the heat transfer surface 104 and heats the phase change material 50 in the heating core 10.

[0089] It goes without saying that this type of charging can also be done with an electric heating device 60 as in the Figures 4 to 6 can be combined.

[0090] Figure 8 in a sectional view a warming plate 200 according to an embodiment of the invention.

[0091] In this embodiment of the portable heating source, the heating core 10, together with the phase-elastic material 50 arranged in a housing 40, is located in a cavity 202 of the thermal insulation 70. The thermal insulation 70 is designed to be divisible along a dividing line 210, so that a portion of the thermal insulation 70 can be lifted off.

[0092] To heat the heating core 10, an electric heating device 60, e.g., a resistance heater or induction heater, can be provided. For example, an inductor plate 208, which is heated by electromagnetic radiation, can be arranged on at least one side of the housing 40.

[0093] The warming plate 200 is surrounded by a handle rim 206, allowing for a comfortable and secure grip. The warming plate 200 is used for keeping food warm or for tempering people or objects. The warming plate 200 can be adapted to suit various applications.

[0094] The Figures 9 to 11 Exemplary embodiments of a portable heating source according to the invention in the form of ovens 300 are shown. The ovens 300 are used for heating people or rooms.

[0095] Figure 9Figure 1 shows a sectional view of an oven 300 according to an embodiment of the invention. The heating core 10 with the housing 40 filled with the phase-change material 50 is arranged in a mobile transport trolley 308. Advantageously, this transport trolley 308 is designed similarly to a trolley or shopping cart and can thus be easily moved, for example, by means of a handle 306.

[0096] The heating core 10 is arranged in a central cavity 302 of a first thermal insulation 70, which is surrounded by a further thermal insulation 304.

[0097] The thermal insulation 70, 304 can be constructed in such a way that, for example, heat radiation from the heating core 10 can be emitted to the environment via openings.

[0098] Optionally, the oven 300 can also have a recess 310 in which, for example, a hot water tank 311 can be accommodated, which is supplied by the heat of the heating core 10. This is in Figure 10depicted.

[0099] Not shown in the Figure 9 and 10 Any electrical power connection required for the electrical charging of the heating core 10. This can conveniently be designed so that conventional sockets can be used.

[0100] Figure 11 schematically illustrates oven 300 according to Figure 10 in a building or tent 312.

[0101] Heat is transferred from the stove 300 to the surroundings via the thermal insulation 70, 304 or via air ducts within the thermal insulation 70, 304. This process utilizes natural convection or, depending on the design, a chimney effect. The depicted structure (hut, tent, etc.) can either be a separate component from the stove 300 or directly integrated with it. 10 Heating core 20 Heat conduction device 40 Enclosure 50 Phase change material 60 Heating device 70 Thermal insulation 100 Cooking plate 102 Mounting 104 Heat transfer surface 106 Handle 108 Carrying frame 110 Adjustment device 112 Shelf 114 Opening 116 Cover 118 Adapter 120 Vessel 200 Warming plate 202 Cavity 206 Handle edge 208 Inductor plate 300 Oven 302 Cavity 304 Thermal insulation 306 Handle 308 Transport trolley 310 Recess 311 Hot water tank 312 Building

Claims

1. Portable heat source, particularly in the form of a cooking plate (100) and / or a warming plate (200) and / or an oven (300), having a heating core (10) containing at least one phase change material (50) in a housing (40), wherein the heating core (10) is surrounded at least partially by a thermal insulation (70), and wherein the phase change material (50) comprises a metallic phase change material (50), characterised in that the phase change material (50) has a phase change temperature of at least 500°C.

2. Portable heat source according to claim 1, wherein the phase change material (50) comprises a metallic alloy or semi-metallic alloy having one or several of the components aluminium, silicon, copper, magnesium, boron, zinc, particularly an AlSi alloy, preferably AlSi12.

3. Portable heat source according to any of the preceding claims, wherein in the housing (40), in particular within a region with phase change material (50), is arranged a thermal conduction device (20).

4. Portable heat source according to any of the preceding claims, wherein the phase change material (50) has a larger thermal expansion coefficients than a material of the housing (40) and / or wherein the phase change material (50) is in thermal contact at least in some parts with the thermal conduction device (20), in particular wherein the phase change material (50) has a larger thermal expansion coefficient than a material of the thermal conduction device (20) at least in the contact region with the thermal conduction device (20).

5. Portable heat source according to any of the preceding claims, characterised in that the housing (40) and / or the thermal conduction device (20) is formed of fibre reinforced ceramic material, particularly of a fibre reinforced non-oxidic ceramic material, particularly of carbon fibre reinforced carbon and / or carbon fibre reinforced silicon carbide and / or silicon carbide reinforced carbon and / or silicon carbide fibre reinforced silicon carbide and / or ceramic, in particular aluminium oxide, zirconium oxide, boron nitride, silicon oxide, aluminium nitride, silicon carbide, boron carbide and / or graphite.

6. Portable heat source according to any of the preceding claims, characterised in that the phase change material (50) can be supplied with energy by means of electrical energy and / or solar radiation.

7. Portable heat source according to any of the preceding claims, characterised in that the thermal conduction device (20) is coupled or can be coupled to a heating device (60) or has a heating device (60), in particular wherein the heating device (60) is an electrical heating device.

8. Portable heat source according to any of the preceding claims wherein the thermal insulation (70) has pyrogenic silicon dioxide and / or mineral wool and / or calcium silicate and / or ceramic fibres and / or mica and / or a vacuum insulation.

9. Portable heat source according to any of the preceding claims, wherein in the case of a design as a cooking plate (100) the thermal insulation (70) has an opening (114) which can in particular be closed by a thermally insulating cover (116), through which opening a heat transfer surface (104) of the heating core (10) is accessible.

10. Portable heat source according to claim 9, wherein an adjusting device (110) is provided with which a variable distance between the transfer surface (104) and a storage surface (112) can be adjusted.

11. Portable heat source according to claim 9 or 10, wherein the opening (114) accommodates exchangeable adapters (118) in proper use state, in particular wherein different adapters (118) have different heights and / or different distances from the heating core (10) and / or different thermal conductivities and / or different diameters.

12. Portable heat source according to any of the preceding claims, wherein in a configuration as a warming plate (200) the heating core (10) is arranged in a hollow space (202) of the thermal insulation (70), wherein the thermal insulation (70) is designed so as to be divisible.

13. Portable heat source according to any of claims 9 to 12, wherein the cooking plate (100) or warming plate (200) has one or several handle arrangements (106, 206).

14. Portable heat source according to any of claims 9 to 13, wherein the heating core (10) is designed as a substantially flat plate, the diameter of which is greater than its height.

15. Portable heat source according to any of claims 1 to 8, wherein in a configuration as an oven (300) the housing (40) is arranged in a mobile transport trolley (308).

16. Portable heat source according to claim 15, wherein the thermal insulation (70) has a hollow space (302) in which the heating core (10) is arranged and the first thermal insulation (70) is surrounded by a second thermal insulation (304).

17. Portable heat source according to claim 15 or 16, wherein an indentation (310) is arranged in the first and / or second thermal insulation (70, 304) as a warming area, in particular wherein the indentation (310) is intended for the reception of a warm water container (311).

18. Portable heat source according to any of claims 15 to 17, wherein the heating core (10) is designed as a cylinder, the diameter of which is smaller than its height.