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<p>Radiative cooling is a passive, energy-free technology that is crucial for energy conservation and mitigating the greenhouse effect. Silver (Ag) is most commonly selected as the metallic reflector layer for radiative cooling due to its high reflectivity across the solar spectrum. However, the high absorptivity of metallic silver in the ultraviolet (UV) spectrum severely limits cooling efficiency. To address this challenge, this study focuses on enhancing the cooling performance of passive daytime radiative cooling (PDRC) technology by developing a novel UV-management wind cover for PDMS/Ag radiative coolers. Its optical properties are measured across the solar spectrum and atmospheric window bands. Theoretical analysis reveals that UV pretreatment reduces solar radiation absorption by 25% and atmospheric radiation absorption by 10% in the radiative cooler. Experimental results demonstrate that under high-altitude environment with intense ultraviolet radiation, the temperature of the UV-pretreated radiative cooler is 5.1°C lower than that of the untreated cooler. This approach enables lower daytime radiative cooling temperatures in regions with high ultraviolet radiation.</p>

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UV Pre-Management Strengthens the Daytime Radiative Cooling under Direct Sunlight

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Ziyan Li,
  • Yongjia Wu,
  • Chuanjie Shi,
  • Xinyuan Ding,
  • Qiong Chen,
  • Caixia Wang,
  • Yan Ding,
  • Tingzhen Ming

摘要

Radiative cooling is a passive, energy-free technology that is crucial for energy conservation and mitigating the greenhouse effect. Silver (Ag) is most commonly selected as the metallic reflector layer for radiative cooling due to its high reflectivity across the solar spectrum. However, the high absorptivity of metallic silver in the ultraviolet (UV) spectrum severely limits cooling efficiency. To address this challenge, this study focuses on enhancing the cooling performance of passive daytime radiative cooling (PDRC) technology by developing a novel UV-management wind cover for PDMS/Ag radiative coolers. Its optical properties are measured across the solar spectrum and atmospheric window bands. Theoretical analysis reveals that UV pretreatment reduces solar radiation absorption by 25% and atmospheric radiation absorption by 10% in the radiative cooler. Experimental results demonstrate that under high-altitude environment with intense ultraviolet radiation, the temperature of the UV-pretreated radiative cooler is 5.1°C lower than that of the untreated cooler. This approach enables lower daytime radiative cooling temperatures in regions with high ultraviolet radiation.