分段温差电元件的设计

Design of segmented thermoelectric element

由于分段温差电元件能够在较宽的温度范围内很大程度地提高热电转换效率,因此,在世界范围内受到广泛的关注。对碲化铅(PbTe)材料和碲化铋(Bi2Te3)材料组成的分段温差电元件进行了理论设计和计算。确定了在热面温度为773K、冷面温度为323K,元件总长度为15mm时,PbTe的最佳长度为8.8mm。测试结果表明:由设计的元件制作出的分段温差电单偶的热电转换效率达到了7.31%。

The segmented thermoelectric element has been paid much attention in the world because of its high thermoelectric conversion efficiency in wide temperature scope. The author has designed and calculated segmented thermoelectric element composed of thermoelectric materials PbTe and Bi2Te3, and determined that the best length of segment PbTe is 8.8 mm when hot surface temperature is 773 K, cold surface temperature is 323 K and total length of element is 15 mm. The test results have shown that the thermoelectric conversion efficiency of segmented thermoelectric unicouple made by designed element reached to 7.31%.