半导体热电转换单元发电性能的变物性计算模型

Calculation Model of Semiconductor Thermoelectric Generator Unit Based on Variable Material Properties

为实现半导体热电转换单元发电性能参数的计算,在分析已有的常物性计算模型的基础上,提出了全新的变物性计算模型,该模型包括半导体颗粒温度场分布的求解、材料特性参数的计算和发电性能参数的计算3个部分.在不同工作条件下,分别利用常、变物性计算模型进行发电性能参数的计算,并将计算结果与ANSYS有限元仿真结果进行对比.结果表明变物性计算模型能够较大程度地减少误差,是对常物性计算模型的有效改进.

In order to effectively calculate the electricity-generating performance parameters of semiconductor thermoelectric generator units, the existing calculation model based on constant material properties is analyzed, and a new model based on variable material properties, which includes the procedures of solving the temperature distribution of semiconductor particles and calculating the material parameters as well as the electricity-generating performance parameters, is proposed. Then, the two models respectively based on constant and variable material properties are used to calculate the performance parameters of a semiconductor thermoelectric generator unit in various working conditions. The results are finally compared with those of ANSYS simulation. It is found that the proposed model based on variable material properties is superior to that based on constant material properties because it greatly reduces the calculation error.