Derived formulas on quality factor cylindrical furnaces and induction heaters. In order to simplify the formulas introduced without dimensional relative energy absorption coefficient of the electromagnetic field relative to copper at 20°C. The values of this coefficient are summarized in the table as a function of temperature for the commonly used metals. Received simple formulas are additionally useful for rapid implementation of initial engineering projects and for teaching. Waveforms plotted efficiency. quality factor and compared with the values appearing in the literature.

Keywords: Electroheat, Induction heating, Parameters of induction furnaces and heaters, Crucible furnace