高效分段温差电单偶仿真设计

由于温差电材料的热电性能随着温度变化而变化，优值系数ZT也随之改变，导致不同温差电材料的只在某一温度区间有较高的效率，因此，分段温差电元件概念被提出，据此可以在很大程度上提高热电转换效率。本文建立了基于P型BiSbTe＼Zn4Sb3＼CeFe4Sb12、N型Bi2Te3＼GoSh3半导体分段温差电单偶模型异进行了ANSYS有限元分析。在对分段温差电元件长度比、截面比及负载电阻均进行优化后，得到在冷端温度为298K，热端温度为973K、873K、773K、673K时的理论转换效率分别为15．2％、13．8％、12．1％、10．6％。

Simulation and Design of High Efficiency Segmented Thermoelectric Unicouple

Since the performance parameters of thermoelectric materials are all dependent on their tempera- tures, so is the high - quality coefficient ZT, which results in that different thermoelectric material performs its higher efficiency only within certain temperature range, this paper introduces one segmented thermoelectric element design concept that would make the thermoelectric efficiency be improved very much. Authors established segmented thermoelectric unicouple model based on P- type BiShTe ／ Zn4Sb3 ／ CeFe4Sb12 and N - type Bi2Te3 ／ CoSb3 and one new design were estimated by means of commercial finite element method software ANSYS. The segmented thermoelectric element length ratio, element cross ratio and load resistance all have been optimized, as a result, the new device theoretical efficiency are 15.2 %, 13.8 %, 12.1% and 10.6 %, respectively when hot temperatures are 973 K, 873 K, 773 K and 673 K while cold temperature is kept at 298 K.