The conventional tandem photovoltaic-thermoelectric generator (PV-TEG) system has proved the feasibility of solar full-spectrum utilization technology. Nevertheless, the inconsistent operating temperature range for PV and TEG impedes the development of this technique. Hence, to tackle the challenge of mismatch operating temperature issues, a developed bifacial PV-TEG system combined with flat plate heat pipe (FPHP) is proposed in this study. A 3D numerical model has been built to make a comparative analysis between the bifacial FPHP-PV-TEG system and the conventional tandem FPHP-PV-TEG system. The influences of solar concentration ratio, convective heat transfer coefficient, external load resistance, different working fluids on the output power and conversion efficiency are analyzed. The obtained results indicate that the comprehensive performance of the proposed bifacial FPHP-PV-TEG system is superior to that of the conventional tandem FPHP-PV-TEG system. An increase of 20.98% and 14.05% in overall power generation and energy conversion efficiency could be achieved in bifacial FPHP-PV-TEG system compared with tandem FPHP-PV-TEG system, when the solar concentration ratio is 6 and the convective heat transfer coefficient is 1200 W/m²/K. Moreover, the behavior of the two systems could be enhanced by increasing the solar concentration ratio and the convective heat transfer coefficient. Besides, using water as working medium exhibits the best performance followed by ethanol and acetone in the bifacial FPHP-PV-TEG system, while the variation of working medium in tandem FPHP-PV-TEG system could be almost neglected.

传统的串联光伏热电发电机（PV-TEG）系统已经证明了太阳能全光谱利用技术的可行性。然而，PV 和 TEG 不一致的工作温度范围阻碍了该技术的发展。因此，为了解决不匹配工作温度问题的挑战，本研究提出了一种结合平板热管 (FPHP) 的开发的双面 PV-TEG 系统。建立了 3D 数值模型，对双面 FPHP-PV-TEG 系统和传统串联 FPHP-PV-TEG 系统进行了比较分析。分析了太阳能聚光比、对流传热系数、外负载电阻、不同工质对输出功率和转换效率的影响。获得的结果表明，所提出的双面 FPHP-PV-TEG 系统的综合性能优于传统的串联 FPHP-PV-TEG 系统。当太阳能聚光比为6且对流换热系数为6时，双面FPHP-PV-TEG系统与串联FPHP-PV-TEG系统相比，整体发电效率和能量转换效率分别提高20.98%和14.05%是 1200 瓦/平方米² /K。此外，可以通过增加太阳能集中比和对流传热系数来增强两个系统的行为。此外，在双面FPHP-PV-TEG系统中，以水为工作介质表现出最佳性能，其次是乙醇和丙酮，而串联FPHP-PV-TEG系统中工作介质的变化几乎可以忽略不计。