Study on a novel solar spectral beam splitting photovoltaic/thermal system based on secondary reflection

Hongxu Du, Longyu Xia, Gaosheng Wei, Gang Wang and Xiaoze Du

Energy, 2025, vol. 319, issue C

Abstract: In order to achieve full-spectrum solar energy utilization, a spectral beam splitting photovoltaic/photothermal system based on secondary reflection is proposed and simulated through Monte Carlo ray tracing method (MCRT). The designed system concentrates solar radiation to a solar cell covered with a spectral beam splitter film through primary trough collector. After spectral beam splitting, the transmitted solar rays in wavelength of 380 nm–1100 nm are used for photovoltaic power generation, and with rest of light for photothermal recovery. The results show that the designed spectral beam splitter can achieve 93.77 % of transmittance in 380 nm–1100 nm wavelength for photovoltaic power generation and 93.14 % of reflectance for other wavelengths for photothermal recovery. The system can achieve 73.9 % of optical efficiency under the tracking error of 0.75°. The PV photoelectric conversion efficiency of the spectral beam splitting solar cell is 7.3 % higher than the normal solar cell. The highest system thermal efficiencies and evacuated solar collector tube thermal efficiency is 49.8 % and 72.7 %, respectively, and the system electrical efficiency can reach to 15.05 % on a typical day in August of Beijing. The system can output 92.7 W/m2 electricity and 354.0 W/m2 thermal energy, simultaneously.

Keywords: Solar energy; Concentrating photovoltaic; Spectral beam splitting technology; Solar thermal utilization (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:319:y:2025:i:c:s0360544225004797

DOI: 10.1016/j.energy.2025.134837

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