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Adiabatic and isothermal configurations for Re4Si7 transverse thermoelectric power generators
Applied Physics Reviews ( IF 15.0 ) Pub Date : 2022-06-23 , DOI: 10.1063/5.0073354
Michael R. Scudder 1 , Karl G. Koster 1 , Joseph P. Heremans 2, 3, 4 , Joshua E. Goldberger 1
Affiliation  

Transverse thermoelectric generators (TTEGs) have the potential to overcome two challenging problems that limit the commercial application of classical thermoelectric generators (TEGs): the significant irreversible efficiency losses in the contacts and the thermal degradation of the contacts at the hot end. TTEGs are built from a single material that can generate a thermoelectric current in a direction that is orthogonal to a temperature gradient. They only require a single set of contacts that are displaced away from the hot end. Here, we experimentally explore the device design considerations for optimizing the performance of this far less explored class of thermal-to-electric generation devices. We fabricate Re4Si7 TTEGs and show that there is no measurable loss in efficiency with a single set of contacts that are midway between the hot and cold ends. We show that a new effect must be considered: the appearance of transverse thermal gradients that lead to significant differences between the performance of TTEGs implemented in isothermal and adiabatic geometries. The isothermal TTEG configuration leads to much higher device efficiencies. Overall, this work highlights how different the design of TTEGs is from that of conventional TEGs and the importance of controlling the device geometry for optimum waste heat recovery.

中文翻译:

Re4Si7 横向热电发电机的绝热和等温配置

横向热电发电机 (TTEG) 有可能克服限制传统热电发电机 (TEG) 商业应用的两个具有挑战性的问题:触点中显着的不可逆效率损失和热端触点的热降解。TTEG 由单一材料制成,可以在与温度梯度正交的方向上产生热电流。它们只需要一组远离热端的触点。在这里,我们通过实验探索了设备设计考虑因素,以优化这种探索较少的热电发电设备的性能。我们制造 Re4个7TTEG 和表明在热端和冷端之间的中间的一组触点没有可测量的效率损失。我们表明,必须考虑一种新的影响:横向热梯度的出现导致在等温和绝热几何结构中实现的 TTEG 的性能之间存在显着差异。等温 TTEG 配置可带来更高的器件效率。总的来说,这项工作突出了 TTEG 的设计与传统 TEG 的设计有何不同,以及控制设备几何形状以实现最佳废热回收的重要性。
更新日期:2022-06-23
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