关于ZT与热电效率之间关系的反直观示例
Counterintuitive example on relation between ZT and thermoelectric efficiency
摘要：
利用电导率、塞贝克系数、热导率和绝对温度T定义的热电优值系数ZT已被广泛用作热电热机的转换效率的简单估计器。当材料性质恒定或随T缓慢变化时，较高的ZT确保热电材料的较高的最大转换效率。然而，由于材料特性可能随T变化很大，因此基于ZT的效率预测可能不准确，特别是对于宽温度应用。此外，虽然ZT值继续增加，但没有研究ZT与较高ZT制度中的效率之间的关系。在本文中，我们通过比较两种材料报告了一种违反直觉的情况：尽管一种材料在整个工作温度范围内具有较高的ZT值，但其最大转换效率小于另一种材料。这表明，对于材料比较，在某些情况下，与ZT的简单比较相比，精确效率的评估是必要的。
英文摘要：
The thermoelectric figure of merit ZT, which is defined using electrical conductivity, Seebeck coefficient, thermal conductivity, and absolute temperature T, has been widely used as a simple estimator of the conversion efficiency of a thermoelectric heat engine. When material properties are constant or slowly varying with T, a higher ZT ensures a higher maximum conversion efficiency of thermoelectric materials. However, as material properties can vary strongly with T, efficiency predictions based on ZT can be inaccurate, especially for wide-temperature applications. Moreover, although ZT values continue to increase, there has been no investigation of the relationship between ZT and the efficiency in the higher ZT regime. In this paper, we report a counterintuitive situation by comparing two materials: although one material has a higher ZT value over the whole operational temperature range, its maximum conversion efficiency is smaller than that of the other. This indicates that, for material comparisons, the evaluation of exact efficiencies as opposed to a simple comparison of the ZTs is necessary in certain cases.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
