High-performance terrestrial solar thermoelectric generators without optical concentration for residential and commercial rooftops
High-performance terrestrial solar thermoelectric generators without optical concentration for residential and commercial rooftops
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DOI：
10.1016/j.enconman.2019.05.089
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发表时间：
2019-09
影响因子：
10.4
通讯作者：
Song Lv;Wei He;Zhongting Hu;Minghou Liu;Minghui Qin;S. Shen;Wei Gong
中科院分区：
文献类型：
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作者：
Song Lv;Wei He;Zhongting Hu;Minghou Liu;Minghui Qin;S. Shen;Wei Gong
太阳能热电发电机（STEG）系统很有吸引力，因为它们可以通过固态热电发电机将太阳能直接转化为电力。然而，其低能量转换效率阻碍了其大规模实施和商业化。到目前为止，没有集中的STEG的最佳实验效率为4.6%，并且仅在特定应用部署环境中测试单个热电单偶。在本文中，数学模型包含各种热损失忽略了以前的研究开发和验证，以确认改善STEG性能的可能性。通过对热电材料、太阳能选择性吸收器的光热效率、热管理和器件集成等方面进行综合优化，研制了一种由热管真空管集热器、太阳能选择性吸收器和TE组件组成的高性能太阳能热电复合器件。实验结果表明，该器件的热电转换效率得到了显著提高，最大电效率达到5.2%。剩余的太阳能被储存起来用于发电或家用。系统的峰值效率达到7.17%。效率高于先前报道的最佳值。通过实验论证了太阳能温差发电器规模化应用的可行性。结果表明，STEG系统是一种很有前途的替代太阳能热利用技术在小规模热电联产应用。
Solar thermoelectric generator (STEG) systems are attractive because they can convert solar heat directly into electricity via solid-state thermoelectric generators. Nevertheless, its low energy conversion efficiency has prevented it from wide-scale implementation and commercialization. To date, the best experimental efficiency for STEG without concentrated is 4.6%, and only testing single thermoelectric unicouple within a specific application deployment context. In this paper, a mathematical model containing various heat losses ignored by previous studies are developed and validated to confirm the possibility of improved STEG performance. We developed a high-performance solar thermoelectric hybrid device composed of heat pipe evacuated tubular collector, solar selective absorber, and TE modules by conducting a comprehensive optimization in terms of thermoelectric material, the optical and thermal efficiency of solar selective absorber, heat management and device integration. The experimental results show that the thermoelectric conversion efficiency of proposed device was enhanced significantly, it produced a peak electrical efficiency of 5.2%. And the residual solar energy is stored for either power generation or domestic used. The peak exergy efficiency of the system reached up to 7.17%. The efficiency is higher than the previously reported best value. We experimentally demonstrated the feasible of the scale application of solar thermoelectric generators. And the results indicated that STEG system is a promising alternative solar energy thermal utilization technology in the small scale co-generation applications.