Electric heating – Heating devices – Combined with diverse-type art device
Patent
1998-05-20
2000-04-11
Jeffery, John A.
Electric heating
Heating devices
Combined with diverse-type art device
219549, 338208, H05B 334, H05B 336, F24D 1302
Patent
active
060490632
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to the heating of large surfaces.
BACKGROUND ART
European Patent 0048608 describes a heating concept wherein low voltage electricity is passed through bare uninsulated electrical conductors into a medium which contains a large volume of non-gaseous material for storing the heat for gradual dissipation. The apparatus described in European Application No. 0048608 by Charlton Thermosystems is primarily designed to store and dissipate heat.
The Charlton Thermosystems concept is to heat a medium with an embedded looped heating element. The heating elements are in the form of steel bars, wire rope, and, it is said, can be embedded in a medium or a base material for the medium. Heat is not dissipated uniformly over a given area.
An object of the present invention is to use low voltage electricity to instantaneously heat large surface areas using similar transformation technology to that described in European Patent No. 0049608.
Further objects and advantages of the present invention will become apparent from the ensuing description.
According to the present invention there is provided a method of heating a surface by means of wire mesh or netting heating element spread evenly over or just under the area to be heated through which an electrical current is driven comprising connecting the two ends of the element to the secondary terminals of a transformer which converts the supply voltage to less than 40 volts.
The mesh heating element is elongated and between 10 m and 100 m long, and has a width of between 75 mm and 1200 mm.
Preferably the wire mesh or netting thickness is less than 2 mm.
The heating element can be uninsulated and encased in a settable medium.
The heating element can provide 2500 cm.sup.2 to 6000 cm.sup.2 of surface per 100 watt output for every square meter to be heated.
According to a further aspect of the present invention there is provided a method of heating a surface by means of wire mesh or netting heating element spread evenly over or just under the area to be heated through which an electrical current is driven comprising connecting the two ends of the element to the secondary terminals of a transformer which converts a supply voltage of the order of standard mains voltage volts to less than 40 volts at 16 amps to 240 amps current throughput depending on size.
The mesh heating element may be elongated and may be between 10 m and 100 m long, and have a width of between 75 mm and 1200 mm, depending on the size and dimensions of the area to be heated. Wire thickness may be less than 2 mm diameter which requires only a very thin layer of grout, bedding compound, adhesive or plaster where particular floor surfaces require such a backing.
The voltage across the heating element is preferably less than 40 volts and in most cases will be around 30 volts so the dimension of the copper cable is compatible with the wire in the mesh.
Steel is used as both conductor and heating element and is commonly uninsulated but may be encased in grout, bedding compound, adhesive, plaster or PVC sheet etc to hold the elements in position.
Cross wires may be used to:
The method can provide a heating element with some 2500 cm.sup.2 to 6000 cm.sup.2 of surface per 100 watt output for every square meter to be heated.
The heated surface may be a floor, wall and ceiling of a building, yard or vessel.
The special value of the mesh heating is the very even spread of heat over large surface areas, the great strength of the heating element itself which provides security of the system against rough handling during installation, surface medium cracking or movement during use, and the low voltage electricity used, providing electrical safety against contact with the heating element and/or soaking in water.
The invention is specifically aimed for use in providing 24 hour per day switch on/switch off heat to carpet, vinyl, linoleum, tiled and grout or levelling type compound surfacing. The system could be used for many other surface heating requirements and may be used for supplying hea
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