Electric heating – Heating devices – With heating unit structure
Patent
1979-01-04
1981-07-21
Bartis, A.
Electric heating
Heating devices
With heating unit structure
137341, 138 33, 219 1049R, 219300, 219301, 219535, 219544, 338243, 338247, H05B 300, F16L 5300
Patent
active
042800455
ABSTRACT:
An electrical heat generating system of the skin effect current type having a two part elongate hollow element of ferromagnetic material enclosing an insulated energizing conductor. One part of the hollow element comprises an open face channel having two elongated, coextensive, spaced longitudinal edges and the other part covers the open face of the channel. When the conductor is energized by an alternating current, the magnetic field generated thereby is confined within the interior of the hollow element to produce heat without any current passing through and along the outer peripheral surfaces thereof. Each of the two parts of the heat generating system may be rectilinear or one or both of the parts may be arcuate and both parts are secured together by staggered stitch welding to provided spaced openings between the stitch welds enabling substantial transverse air flow freely through the hollow element across the conductor and interval surfaces of the hollow element, so that heat is transferred to a pipe to be heated not only by conduction, as by direct contact between the contiguous surfaces of the hollow element and the pipe, but also by convection through the openings and along a portion of the outer perimeter of the pipe. The system can also be used for heating driveways. This system is independent of the element to be heated and can be used in heating adjoining surfaces that are not only metallic but also nonmetallic.
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Brochure--TL--03 "Electric Heating System for Pipelines--SEC Tracing", Copyright 1975 by Pipe Heating System, Inc., Brecksville, Ohio 44141 8 pages.
Brochure--"Poly-Therm Piping System", 1974, by Perma-Pipe division of Midwesco, Inc., Niles Illinois 6 pages.
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