Electric heating – Inductive heating – With heat exchange
Patent
1996-03-18
1999-06-22
Leung, Philip H.
Electric heating
Inductive heating
With heat exchange
219630, 219672, H05B 610
Patent
active
059140658
ABSTRACT:
In a heating apparatus for the heating of a solid or fluid medium, several permanent magnets are arranged on the periphery of a rotor which produce a magnetic field in whose region an electrically-conducting medium is arranged. The magnetic field from the permanent magnets is radiated approximately radially. By rotation of the rotor, a relative motion arises between the permanent magnets and the electrically-conducting medium, and eddy currents are effected within the medium, thereby causing heating of the same. Electrically-conductive water can be provided as the medium to be heated. In this embodiment electrically-conductive water is fed through a helical conducting coil, with an inlet and outlet side arranged around the rotor in proximity thereto, and is connected to a line which feeds to a user from the outlet side and back to the inlet side in a closed cycle. With this heating apparatus, heat is transferred to the medium with an improved efficiency. In a second embodiment, permanent magnets are arranged on opposing rotating discs so that they produce a magnetic field between the discs. An electrically-conductive material to be heated is placed between the disks, within the magnetic field. In a third embodiment, permanent magnets are arranged on opposing sides of a centrifugal pump having an electrically-conductive impeller. The discs are stationary. Heat is generated in the impeller when it is rotated. The impeller provides both the heating and the flow of the heated fluid.
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