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Dynamic performance analysis of a concentrated spectrum splitting photovoltaic-thermoelectric hybrid system using radiative cooling

Author

Listed:
  • Chu, Ningning
  • Lai, Peigen
  • Han, Xinyue
  • Zheng, Dengming

Abstract

Concentrated photovoltaic-thermoelectric generator (CPV-TEG) systems are constrained by low efficiency and daylight-dependent operation. While radiative sky cooling (RSC) enables nighttime TEG power generation, most existing studies focus on steady-state performance. This study proposes a solid thin-film spectral splitting CPV-TEG-RSC system (SS-CPV-TEG-RSC), which achieves full-spectrum solar utilization and 24 h continuous power generation through synergistic spectral decoupling and radiative cooling. The key novelty lies in integrating a solid spectral splitter (for thermal decoupling and full-spectrum utilization) with radiative coolers (for 24 h thermal management), thereby overcoming conventional CPV-TEG's daylight limitation. A transient thermal-electrical model was developed and validated. Seasonal and annual performance analyses reveal significant output variations: summer yields the highest peak power density (7866.68 W/m2), but the lowest average efficiency (21.77 %), whereas winter achieves the highest peak efficiency (22.44 %) at the cost of reduced output (5794.96 W/m2). Annual electricity generation reaches 11,474.71 kWh/m2, with July producing 1396.39 kWh/m2 (1376.3 kWh/m2 from PV and 20.09 kWh/m2 from TEG). Sensitivity analysis shows that solar irradiance most strongly influences PV temperature (sensitivity coefficient: 0.419) and TEG temperature difference (0.611), but negatively affects total electrical efficiency. Ambient temperature ranks as the second most influential factor (0.363), while wind speed has minimal impact (0.256).

Suggested Citation

  • Chu, Ningning & Lai, Peigen & Han, Xinyue & Zheng, Dengming, 2026. "Dynamic performance analysis of a concentrated spectrum splitting photovoltaic-thermoelectric hybrid system using radiative cooling," Renewable Energy, Elsevier, vol. 256(PI).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:pi:s0960148125023535
    DOI: 10.1016/j.renene.2025.124689
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    References listed on IDEAS

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