倾斜结构热电元件的多物理场耦合研究

为了提高热电元件的工作性能,在材料用量不变的前提下,提出了新型倾斜结构的热电元件。以常规的垂直型热电元件为参考,采用数值模拟的方法,通过控制热端温度、电流和冷热端温差等参量,对倾斜结构热电元件进行了多物理场耦合研究,重点讨论了倾斜角度对元件制冷性能的影响。结果表明:倾斜角度越大,热电元件冷端温度越低;在小功率条件下,制冷量和制冷系数随倾斜角度的增大而增大;最佳倾角范围是15°~30°;倾斜结构存在场强突变现象;倾斜结构更适用于微小型低功耗热电制冷设备。

Multiphysics Coupling on Thermoelectric Element with Sloping Structure

New type of thermoelectric element with sloping structure is proposed to improve the working performance of thermoelectric element in the condition of same material consumption. Taking the conventional vertical thermoelectric element as a reference, multiphysics coupling is carried on the thermoelectric element with sloping structure by means of numerical simulation and controlling the parameters like hot side temperature, current and temperature difference between cold side and hot side. The influence of slope angle on the cooling performance of thermoelectric element is discussed stressfully. The results show that the larger the slope angle is, the lower the cold side temperature of thermoelectric element is. In the condition of small power, the cooling capacity and coefficient of performance (COP) increase with the increase of the slope angle. The best range of slope angle is 15°-30°. Electric field intensity changes suddenly in sloping structure. Sloping structure is more suitable for the thermoelectric equipment with small size and power.