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Core, sheath, or support means for heating element

Subclass of:

219 - Electric heating

219200000 - HEATING DEVICES

219538000 - With heating unit structure

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
219548000 Of particular construction or material 47
Entries
DocumentTitleDate
20100147828Carbon nanotube heater - A linear heater includes a linear supporter, a heating element and at least two electrodes. The heating element is located on the linear supporter and includes a carbon nanotube composite structure. The carbon nanotube composite structure includes a matrix and at least one carbon nanotube film. The at least one carbon nanotube film includes a plurality of carbon nanotubes entangled with each other. The at least two electrodes are electrically connected to the heating element.06-17-2010
20100163547Carbon nanotube heater - This disclosure related to a heater. The heater includes a carbon nanotube composite structure and at least two electrodes connected to the carbon nanotube composite structure. The carbon nanotube composite structure defines a hollow space. The carbon nanotube composite structure includes a matrix and at least one carbon nanotube film. The at least one carbon nanotube film includes a plurality of carbon nanotubes entangled with each other.07-01-2010
20130056456ELECTRIC HEATER WITH CONNECTION WIRE - An electric heater (03-07-2013
20120118873HEATER, IN PARTICULAR HIGH-TEMPERATURE HEATER, AND METHOD FOR THE PRODUCTION THEREOF - The invention relates to a method for producing a heater, in particular a high-temperature heater and also a high-temperature heater, for example for domestic heating appliances, in which a layer that produces heat when a current flows through is provided on a carrier material (05-17-2012
20100170891Carbon nanotube heater - A planar heater includes a planar supporter, two electrodes and a heating element. The heating element is supported by the planar supporter and electrically connected to the two electrodes. The heating element includes at least one carbon nanotube structure and a matrix. The at least one carbon nanotube structure includes a carbon nanotube film including of a plurality of carbon nanotubes entangled with each other.07-08-2010
20100170890Carbon nanotube heater - This disclosure is related to a heater. The heater includes a hollow supporter, at least one linear carbon nanotube composite structure and at least two electrodes connected to the at least one carbon nanotube composite structure. The at least one linear carbon nanotube composite structure is disposed on a surface of the hollow supporter. The at least one linear carbon nanotube composite structure includes a matrix and a linear carbon nanotube structure. The linear carbon nanotube structure includes a plurality of carbon nanotubes joined by van der Waals attractive force therebetween.07-08-2010
20100170889Heated planar element and method for its attachment - A double-sidedly bondable planar element which has an electrical contacting layer via which it is self-regulatingly intrinsically heatable and at the same time has a high flexibility. The particular features of this planar element are that the planar element in the storage condition is adhesive on one side only, and is therefore particularly easy to handle, and that, on bonding, the adhesive passes through cutouts in the contacting layer, and the planar element thus becomes double-sidedly bondable. The invention further provides a method for the bonding of this planar element, including as a key step the passage of the adhesive through the cutouts in the contacting layer, thus turning a single-sidedly adhesive planar element into a double-sidedly adhesive planar element.07-08-2010
20110024410Carbon nanotube heater - This disclosure is related to a heater. The heater includes a carbon nanotube composite structure and at least two electrodes connected to the carbon nanotube composite structure. The carbon nanotube composite structure defines a hollow space. The carbon nanotube composite structure includes a matrix and at least one carbon nanotube structure. The at least one carbon nanotube structure includes a plurality of carbon nanotubes joined by van der Waals attractive force therebetween. An angle between a primary alignment direction of the carbon nanotubes and a surface of the carbon nanotube structure is about 0 degrees to about 15 degrees.02-03-2011
20100032427HEATER AND METHOD FOR MANUFACTURING THE SAME - A heater (A02-11-2010
20090321418Carbon nanotube heater - An apparatus includes a hollow heater. The hollow heater includes a hollow supporter, a heating element and at least two electrodes. The hollow supporter defines a hollow space, the hollow supporter has an inner surface and an outer surface. The heating element is located on the inner surface or the outer surface of the hollow supporter. The at least two electrodes are electrically connected to the heating element. At least one of the at least two electrodes includes at least a carbon nanotube structure.12-31-2009
20110204041ELECTRIC HEATING ELEMENT WITH A CONNECTION ELEMENT AND PROCESS FOR MANUFACTURING AN ELECTRIC HEATING ELEMENT WITH A CONNECTION ELEMENT - An electrical heating element with a metal jacket, a connecting element lying against the metal jacket at least in some sections and at least one electrical connection. The connecting element has at least one cavity, which borders on a section of the metal jacket at least in some sections and/or on a section of the electrical connection, and the cavity is cast at least partly with a pourable sealing compound, especially with a ceramic cement, epoxy resin or plastic, such that a direct, supporting mechanical connection is consequently produced between the metal jacket and the connecting element and/or between the section of the electrical connection and the connecting element by the pourable sealing compound, wherein the pourable sealing compound is also in contact with an element for securing against rotation, and a process for the manufacture of such an electrical heating element.08-25-2011
20100140259Carbon nanotube heater - An apparatus includes a linear heater. The linear heater includes a linear supporter, a heating element and at least two electrodes. The heating element is located on the linear supporter and includes a carbon nanotube film. The carbon nanotube film includes a plurality of carbon nanotubes. The angle between an alignment direction of the carbon nanotubes and the surface of the heating element ranges from about 0 degrees to about 15 degrees. The at least two electrodes are separately located and electrically connected to the heating element.06-10-2010
20100140258Carbon nanotube heater - An apparatus includes a planar heater. The planar heater includes a heating element and two electrodes. The two electrodes are electrically connected to the heating element. At least one of the two electrodes includes a carbon nanotube structure. The carbon nanotube structure includes at least one carbon nanotube film or at least one linear carbon nanotube structure.06-10-2010
20110220637Heater Apparatus - A heater apparatus comprises a housing, and a plurality of heating elements provided in the housing. The housing includes a front side provided with a first heat outlet for spreading heat in a first direction, and a top provided with a second heat outlet for spreading heat in a second direction perpendicular to the first direction. Moreover, the second heat outlet is operable to switch between a closed state for blocking heat spread and an open state enabling heat spread in the second direction.09-15-2011
20120067868HEATING SYSTEM AND METHOD OF MAKING AND USE - Heating systems including heating elements and fastener materials covered and protected from the environment by a heating cap structure. The heating cap structure can interlock mating ribs or other structure in adjacent heating panels. Additional heating cap, transition, or flashing sections may further cover and protect heating system components. One or more heating elements may include heating cable or heating fluids or materials penetrating heating element bodies. The heating element bodies and heating cap panels and covers can include extruded or otherwise formed sections having a wide variety of shapes that can be varied to provide desired objectives, such as for example supporting strength, increased heat transfer, component cost minimization, component life, heating system weight, and ease of assembly, use, maintenance, expansion, contraction, and adaptability. The outer and other surfaces of the heating system may be painted, including to improve aesthetics. Sealing films and materials may be included.03-22-2012
20090321420Carbon nanotube heater - An apparatus includes a hollow heater. The hollow heater includes a hollow supporter, a heating element and at least two electrodes. The hollow supporter has an inner surface and an outer surface. The heating element is attached on one of the inner and the outer surfaces of the hollow supporter. The heat element comprises of a carbon nanotube film comprising of carbon nanotubes arranged along a same direction. The at least two electrodes are electrically connected to the heating element.12-31-2009
20090321419Carbon nanotube heater - An apparatus includes a linear heater. The linear heater includes a linear supporter; a heating element and at least two electrodes. The heating element is located on the linear supporter and includes at least one linear carbon nanotube structure. The at least two electrodes are separately located and electrically connected to the heating element.12-31-2009
20100200568Carbon nanotube heater - A planar heater includes a planar supporter, two electrodes and a heating element. The heating element is supported by the planar supporter and electrically connected between the two electrodes. The heating element includes at least one carbon nanotube structure and a matrix. The at least one carbon nanotube structure includes a carbon nanotube film including of a plurality of carbon nanotubes. An angle between a primary alignment direction of the carbon nanotubes and a surface of the carbon nanotube film is about 0 degrees to about 15 degrees.08-12-2010
20100200567Carbon nanotube heater - An apparatus includes a planar heater. The planar heater includes a heating element and at least two electrodes. The heating element includes a matrix and a plurality of linear carbon nanotube structures dispersed in the matrix. The at least two electrodes are electrically connected to the plurality of linear carbon nanotube structures.08-12-2010
20100264129ELECTRODE SUPPORT STRUCTURE AND ELECTRIC HEATING DEVICE HAVING SAME - Provided is an electrode support structure in which local heating can be prevented from occurring in a workpiece during the electric heating. The electrode support structure is usable for applying a load to the electrodes used for the electric heating of a metal plate, and comprises at least two members, i.e., a first member to which the electrodes are fixed and a second member which receives the load from the first member or connects the first member to a load means. The support structure in which the two members are joined to each other through an elastic member can uniformly apply the load to the electrodes for electric heating so that the electrodes can uniformly contact with the workpiece, whereby the workpiece can be uniformly heated.10-21-2010
20100147829Carbon nanotube heater - A linear heater includes a heating element and at least two electrodes. The heating element includes at least one linear carbon nanotube composite structure. The at least one linear carbon nanotube composite structure includes a matrix and a linear carbon nanotube structure. The at least two electrodes are electrically connected to the heating element.06-17-2010
20100187221Carbon nanotube hearter - This disclosure related to a heater. The heater includes a carbon nanotube composite structure and at least two electrodes connected to the carbon nanotube composite structure. The carbon nanotube composite structure defines a hollow space. The carbon nanotube composite structure includes a matrix and at least one carbon nanotube film. The at least one carbon nanotube film includes a plurality of carbon nanotubes.07-29-2010
20100258552Polytetrafluoroethylene Heating Product and Its Manufacturing Method - The present invention relates to a polytetrafluoroethylene (hereinafter referred to as PTFE) heating product, the technical solution of which includes embedding at least one piece of electrical heating element inside a PTFE substrate with the electrical heating element wiring terminal(s) exposed out of the substrate for connecting an external power source to energize the heating product. Depending on varied purposes, the PTFE heating product can be manufactured into the cylindrical type, which is used in cylindrical apparatuses such as tank reactors, towers, storage tanks, pipes etc. in the chemical industry, or the plate type, which is used in square-type tanks (as equipment) and as domestic heating radiators, or other special types. The present invention also involves the manufacturing methods and installation of the related apparatuses of said PTFE heating product.10-14-2010
20100230400Carbon nanotube heater - An apparatus includes a planar heater. The planar heater includes a heating element and at least two electrodes. The at least two electrodes are separately and electrically connected to the heating element. The heating element includes a carbon nanotube film, and the carbon nanotube film comprises of a plurality of carbon nanotubes entangled with each other.09-16-2010
20100276416HEATING DEVICE HAVING ELECTRIC AND FUEL POWERED HEAT SOURCES - A portable device which generates heat and which can be used alternatively as a corded, plug-in device or as a cordless, fuel-powered device. The device has dual heating capabilities—each of which is powered by a unique cartridge. For use as a plug-in device an electric cartridge that connects the device to an adapter is utilized, whereas for use as a portable device a fuel cartridge is utilized for supplying a hydrocarbon fuel to support combustion. Use of one of the cartridges prevents the use of the other.11-04-2010
20100147827Carbon nanotube heater - A linear heater includes a linear supporter, a heating element and at least two electrodes. The heating element is located on the linear supporter and includes a carbon nanotube composite structure. The carbon nanotube composite structure includes a matrix and at least one carbon nanotube structures. The at least two electrodes are electrically connected to the heating element.06-17-2010
20100140257Carbon nanotube heater - A heater having a heating element includes a planar carbon nanotube structure and at least two electrodes. The at least two electrodes are electrically connected to the planar carbon nanotube structure. The planar carbon nanotube structure includes a plurality of linear carbon nanotube structure.06-10-2010
20110108545HEATER AND METHOD FOR MAKING THE SAME - A heater includes a first electrode, a second electrode, and a heating element. The second electrode is spaced from the first electrode. The heating element includes a first substrate, a second substrate, a first adhesive layer, a second adhesive layer and a carbon nanotube structure. The carbon nanotube structure is located between the first substrate and the second substrate, and combined with the first substrate by the first adhesive layer, and combined with the second substrate by the second adhesive layer. The carbon nanotube structure is electrically connected to the first electrode and the second electrode. A method for making the heater is also provided.05-12-2011
20100122979Heating resistor element component - To improve heating efficiency and printing quality, a heating resistor element component (05-20-2010
20100000990Carbon nanotube heater - An apparatus includes a hollow heater. The hollow heater has a hollow supporter, a heating element and at least two electrodes. The at least two electrodes are separately and electrically connected to the heating element. The hollow supporter defines a hollow space, the hollow supporter has an inner surface and an outer surface. The heating element disposed on one of the surfaces of the hollow supporter. The heating element includes a carbon nanotube film. The carbon nanotube film is made of a plurality of carbon nanotubes entangled with each other.01-07-2010
20100000989Carbon nanotube heater - An apparatus includes a linear heater. The linear heater includes a linear supporter; a heating element and at least two electrodes. The heating element is located on the linear supporter and includes a carbon nanotube film. The carbon nanotube film includes a plurality of carbon nanotubes joined end-to-end by Van der Waals attractive force therebetween. The at least two electrodes are separately located and electrically connected to the heating element.01-07-2010
20100000988Carbon nanotube heater - An apparatus includes a linear heater. The linear heater includes a linear supporter, a heating element and at least two electrodes. The heating element is located on the linear supporter and includes a carbon nanotube structure. The at least two electrodes are separately located and electrically connected to the heating element.01-07-2010
20100000987Carbon nanotube heater - An apparatus includes a linear heater. The linear heater includes a linear supporter, a heating element and at least two electrodes. The heating element is located on the linear supporter and includes a carbon nanotube film. The carbon nanotube film includes a plurality of carbon nanotubes entangled with each other. The at least two electrodes are separately located and electrically connected to the heating element.01-07-2010
20100000986Carbon nanotube heater - An apparatus includes a hollow heater. The hollow heater includes a hollow supporter, a heating element and at least two electrodes. The hollow supporter defines a hollow space. The hollow supporter has an inner surface and an outer surface. The heating element is attached on one of the inner and outer surfaces of the hollow supporter. The heat element includes at least one linear carbon nanotube structure. The at least two electrodes are electrically connected to the heating element.01-07-2010
20100000985Carbon nanotube heater - A planar heater includes a heating element and at least two electrodes. The at least electrodes are electrically connected to the heating element. The heating element includes a carbon nanotube film comprising of a plurality of carbon nanotubes. An angle between a primary alignment direction of the carbon nanotubes and a surface of the carbon nanotube film is in the range of about 0 degrees to about 15 degrees.01-07-2010
20110056930DEFORMABLE HEATING ELEMENT - A deformable heating element, adapted to be mounted on a support body, comprises at least one heating conductor, one side of which is laid on, and fastened to, a front-side layer of flat base material. The base material, in area of the front-side layer on which the heating conductor is laid and fastened, has a lower compression hardness and/or a volume density than the base material in the area of the opposite rear-side layer thereof.03-10-2011
20110056929ELECTRIC HEATER - An electric heater includes a base, a bracket, a working head and a protecting structure. The bracket is disposed on the base. The working head is disposed on the bracket. The working head includes a supporter and a heating module. The heating module is disposed on the supporter. The heating module includes a heating element and at least two electrodes. The at least two electrodes are electrically connected with the heating element. The heating element includes a carbon nanotube layer structure. The protecting structure covers the heating module.03-10-2011
20110056928WALL MOUNTED ELECTRIC HEATER - A wall mounted electric heater includes a substrate, a heat insulated sheet, a heating element, at least two electrodes and an enclosure. The heat insulated sheet is disposed on a surface of the substrate. The heating element is disposed on the heat insulated sheet. The heating element includes a carbon nanotube layer structure. The at least two electrodes are electrically connected with the heating element. The enclosure fixes the substrate, the heat insulated sheet and the heating element therein.03-10-2011
20110017725HEATED LAMINATED GLASS PANELS - A heated laminated assembly includes a first layer having an electro-conductive film provided thereon. A first conductor having a thickness of at least 0.15 mm is positioned on the electro-conductive film. A second conductor having a thickness of at least 0.15 mm is positioned on the electro-conductive film in spaced-apart relation to the first conductor. A second layer is positioned on the electro-conductive film between the first conductor and the second conductor. A third layer is positioned on the second layer.01-27-2011
20100147830Carbon nanotube heater - A linear heater includes a linear supporter, a heating element and at least two electrodes. The heating element is located on the linear supporter and includes a carbon nanotube composite structure. The carbon nanotube composite structure includes a matrix and at least one pressed carbon nanotube film. The pressed carbon nanotube film includes a plurality of carbon nanotubes. The angle between the carbon nanotubes and the surface of the heating element ranges from about 0 degrees to about 15 degrees. The at least two electrodes are electrically connected to the heating element.06-17-2010
20090321421Carbon nanotube heater - An apparatus includes a linear heater. The linear heater includes a linear supporter; a heating element and two or more electrodes. The heating element is located on the linear supporter. The two or more electrodes are separately located and electrically connected to the heating element. At least one of the two or more electrodes includes a carbon nanotube structure.12-31-2009
20110073586DEFROST HEATER USING STRIP TYPE SURFACE HEAT EMISSION ELEMENT AND FABRICATING METHOD THEREOF AND DEFROST APPARATUS USING THE SAME - Provided is a defrost heater using a surface heat emission element of a metal thin film having a fast temperature response performance and a low thermal density, to thereby use an environment-friendly refrigerant, and that performs quick temperature rising and cooling during performing a defrost cycle, to thereby quickly restart a refrigeration cycle and thus greatly reduce time required for the defrost cycle, and a fabricating method thereof, and a defrost apparatus using the same. The defrost heater includes: a strip type surface heat emission element made of a strip type metal thin plate; an insulation layer that coats the outer circumference of the strip type surface heat emission element; and a heat transfer board on one side surface of which the surface heat emission element on the outer circumferential surface of which the insulation layer has been coated is installed, and that contacts evaporator fins so that heat generated from the surface heat emission element is transferred to an evaporator.03-31-2011
20120037613ELEMENT WIRE CONTACT PREVENTION MEMBER AND METHOD FOR MAINTENANCE OF HEATER DEVICE - An insulative element wire contact prevention member is installed in a heater device having heater element wires spirally wound around the circumference of an object to be heated. The element wire contact prevention member is interposed between the heater element wires in a portion at which a gap between the heater element wires becomes narrower than that at the time of arrangement of the heater element wires due to deformation of the heater element wires.02-16-2012
20120248092LOW TEMPERATURE THERMISTOR PROCESS - A thermistor has a mixture of a temperature sensitive material and a conductive material, and an electrode in electrical contact with the mixture. A method of manufacturing a thermistor includes depositing conductive contacts onto a substrate, printing a thermistor mixture of temperature sensitive material and a conductive material over the contact, and annealing the thermistor mixture to produce a flexible thermistor on the conductive contacts.10-04-2012
20110155719Multi-Level and Vertical Assembling Type PTFE Heater and Methods of Manufacture Thereof - The present invention relates to a multi-level and vertical assembling type PTFE heater and the methods of manufacture thereof. Said heater includes a vertical frame assembled by multi-poles and upper and lower retaining plates. Several levels of PTFE sleeves and electrical heating belts are alternatively disposed on the multi-poles. The number of the poles is determined in accordance with the size and capacity of a heater desired and the power and levels of PTFE electrical heating belts with heating needs. Multiple levels of PTFE electrical heating belts are formed in an assembling way, by which heaters with varied powers are easily produced and with the elements replaceable, will not be wholly wasted in event of an element damaged, thus the heater service life prolonged. Said heater has a better heating result than the one with only a single level of heating structure.06-30-2011
20120118872FIXING HEATER AND MANUFACTURING METHOD THEREOF - A fixing heater is provided that employs, as a heating element, a material having small heat capacity and excellent wear resistance. A metal or semi-metal compound that can act as an electrical conduction inhibiting material is mixed into a carbon-containing resin such as a furan resin, chlorinated vinyl chloride resin, etc., and a pattern of a heating element is formed on a substrate, by screen printing, and then is sintered at temperature of about 1000° C. to obtain a fixing heater including amorphous carbon and having NTC characteristics.05-17-2012
20120168428ELECTROTHERMAL TRANSFER DEVICE AND ELECTROTHERMAL TRANSFER METHOD - An electrothermal transfer device includes a substrate, a plurality of electrothermal components and a heating circuit. The electrothermal components are disposed on a surface of the substrate and arranged in a pattern. The heating circuit is electrically connected to the electrothermal components. In an electrothermal transfer method, at first, a transfer substrate is disposed on a workpiece substrate. Then, the electrothermal transfer device is disposed on the transfer substrate so that the electrothermal components contact with the transfer substrate. Thereafter, the heating circuit is used to heat the electrothermal transfer components so that the transfer substrate is heated to be transferred to the workpiece substrate. The electrothermal transfer device and the electrothermal transfer method can reduce cost.07-05-2012
20120312802SEALANT CURING APPARATUS - A sealant curing apparatus is disclosed. In one embodiment, the apparatus includes a processing object panel, a panel supporting unit supporting the processing object panel and a voltage applying unit including a first electrode and a second electrode positioned on the panel supporting unit via the processing object panel interposed therebetween and having different polarities. The processing object panel includes: i) a conductive layer pattern including a heating unit that includes a lattice (grid) pattern, a connecting unit coupled to the first electrode and the second electrode, and a coupling unit connecting the heating unit and the connecting unit and ii) a sealant formed according to the heating unit.12-13-2012
20110120986ELECTRICAL HEATER FOR HEATING SUBSTANTIALLY CYLINDRICAL OBJECTS - The present invention relates to an electric heater (05-26-2011
20110226754Heating Cable - According to a first aspect of the present invention, there is provided a self-regulating electrical heating cable comprising: a first power supply conductor extending along the length of the cable; a second power supply conductor extending along the length of the cable; a third power supply conductor extending along the length of the cable; the first and second power supply conductors being in electrical connection with each other via a first electrically conductive heating element body having a positive temperature coefficient of resistance, and the second and third power supply conductors being in electrical connection with each other via a second electrically conductive heating element body having a positive temperature coefficient of resistance, and wherein, in use, the first, second and third power supply conductors are not physically connected to one another.09-22-2011
20120125913APPARATUS FOR HEATING A PIPE - An apparatus for heating a pipe is disclosed. An apparatus for heating a pipe configured to heat a pipe line by covering the pipe line, which comprises: an inner sheet covering the pipe line in such a way that one surface thereof faces an outer surface of the pipe line; a heating wire distributed on the other surface of the inner sheet; an insulation pad stacked on the other surface of the inner sheet and configured to insulate heat emitted from the heating wire; and stitches configured to fix the heating wire to the inner sheet or the insulation pad, can simplify the configuration and manufacturing process of the apparatus for heating a pipe.05-24-2012
20120080422APPARATUS FOR MAKING HOT WATER USING CARBON HEATER - An apparatus for making hot water using a carbon heater is provided, which includes a carbon hater disposed at the center, a heat transfer pipe assembly surrounding in contact with the outer circumference of the carbon heater and heated by the carbon heater to make hot water, and a heat proof member covering the outer side of the heat transfer pipe assembly to prevent transmission of the infrared ray produced from the carbon heater. It is possible to achieve hot water sterilized by the far-infrared ray generated from the carbon heater, have high performance of making hot water at a short time with the carbon heater, and minimize heat loss due to heat dissipation by improving thermal insulation performance by an external anti-heat dissipation member, by disposing a heat transfer pipe in close contact to the outer circumference of the carbon heater, and circulating water through the heat transfer pipe.04-05-2012
20110233191ELECTRICAL HEATING ELEMENT - Electrical heating element 09-29-2011
20110272394HEATING ELEMENT AND A MANUFACTURING METHOD THEREOF - The present invention provides a heat emitting body including a) a transparent substrate, and b) a conductive heat emitting pattern having a boundary line shape of figures forming a Voronoi diagram and an intersection point part of boundary lines, at which two or more boundary lines meet each other, forming a curve on at least one side of the transparent substrate, and a method for manufacturing the same.11-10-2011
20110309067Heater Device and Method of Making Same - Electrically conductive traces, circuits, and devices such as heaters using such are described. Also described are various methods of forming the electrically conductive traces and circuits.12-22-2011
20120018421MINERAL INSULATED SKIN EFFECT HEATING CABLE - A skin-effect heater cable has inorganic ceramic insulation. The heater cable has at least one core conductor wire within a sheath. Electricity is directed through the core conductor in an outward path and returns along a surface “skin” of the sheath in a return path for generating heat.01-26-2012

Patent applications in class Core, sheath, or support means for heating element

Patent applications in all subclasses Core, sheath, or support means for heating element