半导体温差发电过程的模型分析与数值仿真

发布时间：2018-03-24 23:25

  本文选题：温差发电　切入点：热电模型　出处：《物理学报》2014年19期

【摘要】：本文提出一种新型的半导体温差发电模型,在温差发电过程的数值模拟中考虑了热电单元之间封闭腔体内空气传热的影响.同时进一步运用有限元的数值计算方法对不同电臂对数和不同型号温差发电模型的温度场、电压场进行了数值仿真计算,并对仿真结果进行分析.结果表明:采用127对热电单元模型计算的能量转换效率随冷热端温差增大而迅速提高,与采用1对热电单元模型计算的能量转换效率之差从冷热端温差为20℃的0.39%提高到冷热端温差为220℃时的5.16%,能量转换效率比1对热电单元平均高出3.02%.冷端温度恒定在30℃时,温差发电芯片的输出电压、功率以及能量转换效率均随着电偶臂的横截面积的增大而提高,且电偶臂冷热两端的温差越大提高幅度也越大,而温差发电芯片内阻则与电偶臂横截面积成反比关系,当温差为220℃时对应的输出功率最高达28.9 W.
[Abstract]:In this paper, a new model of semiconductor thermoelectricity generation is proposed. In the numerical simulation of thermoelectric generation process, the influence of the air heat transfer in the closed cavity between thermoelectric units is considered, and the temperature field of different electric arm logarithm and different models of thermoelectric power generation model is further calculated by using finite element method. The voltage field is numerically simulated and the simulation results are analyzed. The results show that the energy conversion efficiency calculated by 127 for the thermoelectric unit model increases rapidly with the increase of the temperature difference between the cold and hot ends. The difference of energy conversion efficiency calculated with the model of 1 pair of thermoelectric units is increased from 0.39% of the temperature difference at the cold and hot ends to 5.16% of the temperature difference at the hot and cold ends at 220 鈩，

本文编号：1660534