An endurable watt-power Bi2Te3-based terrestrial radioisotope thermoelectric generator harvesting decay energy for IoT-based sensors in extreme environments
首发时间:2020-02-07
Abstract:Radioisotope thermoelectric generator (RTG), a technology that mostly adopted in space missions, is regarded as a promising technology to power the Internet of Things-based (IoT) sensors, especially those in extreme environments, for its merits of stability, maintenance-free and long-life. This paper studied RTG\'s application on earth and fabricated an endurable watt-power Bi2Te3-based terrestrial RTG. By employing the finite element analysis, an octagonal cylinder-shaped substituted electric heater was designed to have a higher surface temperature and better temperature uniformity while the fin-shaped radiators to dissipate heat at their optimal heat-sinking capacity. In the experiment part, this terrestrial RTG was tested to have an output power of 4.64 W and an open-circuit voltage of 27.2 V. Also, an optimal electric connection instruction between each thermoelectric (TE) converter was proposed from the experiment. Whereafter, based on the structure used in the experiment part, the finite element analysis was carried out to optimize the geometry of TE converters, the terrestrial RTG possessed an enhanced output power of 10.5 W with an open-circuit voltage of 57.8 V. Ultimately, this paper proposed important guidance for the design and optimization of an endurable terrestrial RTG, which could provide some prospects for its application on IoT-based sensors.
keywords: terrestrial radioisotope thermoelectric generator decay energy harvesting endurable finite element analysis performance optimization
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一种为极端环境中物联网传感器供电的长寿命瓦量级功率陆用同位素温差电池
摘要:同位素温差电池是一种被广泛应用于航天中的技术,因其工作稳定、无需维护、长寿命的工作特点,同位素温差电池也可以作为一种可靠电源为物联网传感器,特别是极端环境中的传感器供电。本文研究了同位素温差电池在陆地上的应用并研制了一款长寿命瓦量级功率的陆用同位素温差电池。通过有限元模拟,本文设计制造的正八面柱形热源能够提供均匀的高温,相应的翅片型散热器则能发挥最佳散热性能并在换能模块上建立起有效温差。实验部分中,这款陆用同位素温差电池的开路电压可达27.2V,同时最佳输出功率为4.64W。另外,通过实验本文总结了电池给不同设备供电时应采取的最佳串并联方式。随后,本文利用有限元模拟优化了温差换能模块的几何尺寸,优化后的陆用同位素温差电池性能进一步提升,其开路电压模拟值达到57.8V,最佳输出功率模拟值提升至10.5W。最终,本文为陆用同位素温差电池的研制提供了一些指导,并为其在物联网传感器中的应用提供了参考。
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一种为极端环境中物联网传感器供电的长寿命瓦量级功率陆用同位素温差电池
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