温度周期性调制使热电发电机的功率输出翻倍
Temperature Periodic Modulation Doubles the Power Output of Thermoelectric Generators
- University of Milano Bicocca（米兰比可卡大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出用非正弦周期性温度调制替代正弦调制，使热电发电机功率输出较静止情况提升高达100%，且适用于考虑温度依赖系数的真实材料，为突破热电效率限制提供新路径。
AI中文摘要：
热电热回收原则上提供了一种灵活、可靠的方式，将热能转化为电能，从而回收废热并为离网设备供电。然而，尽管过去二十年间在改善材料性能方面投入了大量努力，热电转换效率仍然较低。一个在很大程度上尚未被探索的提升收集效率的机会在于动态转换热通量。已有研究[D. Narducci et al., Mater. Today Phys. 54, 101713 (2025)]表明，当热源温度呈正弦调制时，最大功率可增加高达50%。在本文中，我们展示了如何进一步显著增强这一方法。我们发现，正弦调制可以被一种不同的周期性调制所超越，与静止情况相比，功率输出可增加高达100%。此外，我们将分析扩展到恒定性质近似之外，表明功率输出的增强是稳健的，适用于任何真实材料，其中所有唯象系数的温度依赖性均被考虑在内。这一显著的功率输出增强提供了一条新颖且立即可应用的途径，以克服热电设备的效率限制。
英文摘要：
Thermoelectric heat harvesting provides in principle a flexible, reliable way to convert heat into electric energy, thus recovering waste heat and powering off-net devices. However, thermoelectricity conversion efficiency is still low, despite the major efforts deployed over the last two decades to improve materials performances. A largely unexplored opportunity to increase harvesting efficiency is offered by converting heat flux dynamically. It was shown [D. Narducci et al., Mater. Today Phys. 54, 101713 (2025)] that when the temperature of the heat source is sinusoidally modulated, this leads to an increase of the maximum power by up to 50 %. In this paper we show how this approach can be further and significantly enhanced. We found that sinusoidal modulation can be outperformed by a different periodic modulation, leading to an increase of the power output by up to 100 % compared to the stationary case. Furthermore, we extended our analyses beyond the constant-property approximation, showing that the power output enhancement is robust, applying to any real material where the temperature dependence of all phenomenological coefficients is accounted for. This major power output enhancement offers a novel, immediately applicable pathway to overcome the efficiency limits of thermoelectric devices.
