感应式热水器磁热耦合分析

根据液体感应加热和金属体感应加热原理的相似性,推导液体感应加热磁场、涡流和温度场分布方程,建立感应式热水器数学模型.根据数学模型,设定磁场和温度场的边界条件、模拟材料随温度变化特性并建立系统供电电路模型,重点利用分步迭代法进行磁热耦合计算.得出加热体的磁场分布、温度场分布、涡流功率密度,以及发生集肤效应区域提供系统主要能量和控制磁力线逸散能提高加热效率的结论.最后,根据仿真模型预测加热效率,提出系统优化设计方案.

Analysis on Magnetic-Thermal Coupling Field in Induction Water Heater

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 changes with 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 drawn 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 is predicted,and an optimal design method is proposed.