Analysis on Magnetic-Thermal Coupling Field in Induction Water Heater

Abstract:

In this paper, magnetic field of liquid induction heating, eddy current and thermal field distribution equations are processed according to the similarities of liquid induction heating and metal induction heating, while the mathematic model, the magnetic-thermal field boundary conditions and the equivalent circuit are introduced. In this model, the material physical properties are changed by the temperature and the iterative method is used to decouple the magnetic- thermal field. The simulation analyses the magnetic field of this induction heating system, as well as the thermal field and the eddy power density. The conclusions are that the skin region supplies the most of energy for this system, and low magnetic dispersion can improve the heating efficiency. At last, the heating efficiency was predicted, and an optimal design method is proposed.