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Experimental investigation and energy-saving potential evaluation of solar altitude-triggered passive windows

Author

Listed:
  • Liu, Siqi
  • Li, Sainan
  • Zhang, Chunxiao
  • Wang, Lin
  • Wei, Wenzhe
  • Gao, Rong
  • Zhang, Yingbo

Abstract

Windows, as a bridge connecting the interior and exterior, are crucial for regulating indoor lighting, cooling and heating. However, most smart windows ignore the effect of solar altitude, resulting in poor light and heat management performance in practical applications. To address this issue, a solar altitude-triggered passive window (SAT window) is proposed to adjust solar radiation entering the room according to solar altitude. To investigate the indoor environment of the SAT windows, indoor and outdoor chamber experiments were carried out with the effect of solar radiation, solar altitude and hour angle. The results indicate that the indoor air temperature of SAT windows is lower than that of normal windows, with the highest indoor temperature difference of 12.4 °C, and the maximum temperature difference between the outer surfaces of the two windows is 22.5 °C. Meanwhile, the SAT windows have a more prominent energy-saving effect, especially at noon with high solar radiation. In addition, through theoretical calculations, the SAT windows can reduce cumulative annual indoor solar radiation heat gain by 1000-3000 MJ/m2.

Suggested Citation

  • Liu, Siqi & Li, Sainan & Zhang, Chunxiao & Wang, Lin & Wei, Wenzhe & Gao, Rong & Zhang, Yingbo, 2026. "Experimental investigation and energy-saving potential evaluation of solar altitude-triggered passive windows," Renewable Energy, Elsevier, vol. 266(C).
    • Handle: RePEc:eee:renene:v:266:y:2026:i:c:s0960148126004453
    DOI: 10.1016/j.renene.2026.125620
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