FLUID MEDIUM ELECTRIC HEATER Russian patent published in 1997 - IPC

FIELD: off-line heat and hot-water supply systems. SUBSTANCE: inductor 4 is placed inside holding piping 3 in a spaced relation. Inductor 4 is made in built up of composite internal and external permeable cores 5 and 6, respectively, whose walls are joined together at end section on outlet hole side of holding piping 3; inductor coils 7 are placed between them. Walls of internal and external cores 5 and 6 may be also joined on side of inlet holes of piping 3 with bottom of the latter. Central inlet hole of piping 3 is located in center of end section of internal core 5. Clearance between external core 6 and wall of piping 3 is chosen so as to provide utmost heat transfer from inductor case to fluid medium surface and depends on its volume and rate of temperature rise in system. Heating convectors 8 and heating element 9 of hot-water storage tank 10 are connected in parallel with piping 3. Current through inductor coils 7 is controlled by means of temperature controller 15 responding to signals from temperature sensor 16 and from temperature setting unit 17. Power consumption and cold water flowrate are measured by respective meters 14 and 12. EFFECT: improved capacity of electric heater due to at least twice as large inductor case-to-fluid medium contacting surface and reduced magnetic flux built up by inductor coil. 2 cl, 1 dwg