A new dimensionless number for thermoelectric generator performance
A new dimensionless number for thermoelectric generator performance
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DOI：
10.1016/j.applthermaleng.2019.02.093
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发表时间：
2019-04
影响因子：
6.4
通讯作者：
Eurydice Kanimba;Zhiting Tian
中科院分区：
文献类型：
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作者：
Eurydice Kanimba;Zhiting Tian
热电发电机（TEG）将热量转化为电能，为可再生能源发电提供了一种绿色选择。汤姆逊效应已被证明会对TEG的整体性能产生负面影响，但在广泛使用的TEG最大效率计算公式中被忽略。在这项研究中，一个新的无量纲数称为Ury数（Ur）的汤姆逊效应的TEG功率输出和最大效率的影响，Uris定义为汤姆逊系数和塞贝克系数之间的比值。结果表明，随着Ur的增加，TEG的输出功率增加，最大效率降低，Ur与器件的品质因数ZT相结合，可以更好地描述TEG的整体性能。
Thermoelectric generators (TEG) convert heat into electricity and offer a green option for renewable energy generation. The Thomson effect has been proven to impact the overall performance of TEGs negatively but is ignored in the widely-used formula for TEG maximum efficiency calculation. In this study, a new dimensionless number called the Ury number (Ur) is introduced to capture the influence of the Thomson effect on TEG power output and maximum efficiency.Uris defined as the ratio between the Thomson coefficient and the Seebeck coefficient. It is found that asUrincreases both TEG output power and maximum efficiency decrease.Urcombined with the device figure of merit, ZT, can better dictate the overall performance of a TEG.