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<p>Although most prior research on the dew-harvesting technology has focused on nocturnal operations, achieving round-the-clock freshwater harvesting remains crucial. However, daytime dew-harvesting faces two key challenges as compared to its nighttime counterpart: the high solar irradiance and the large contrast between the ambient temperature and the dewpoint. To address these challenges and guide the photonic design, we develop a theoretical framework to analyse dew-harvesting in a 24-h day-night cycle. Using Nanjing as an example, our analyses reveal that, in the solar regime, a minimum average solar reflectivity of 0.92 is required; in the infrared regime, a 10% reduction in absorptivity outside the 8–13 µm transparency window is equivalent to a 5.9% enhancement in emissivity within the window. Guided by these findings, we propose a photonic design, which, in a synthetic experiment with measured meteorological datasets, achieves a water production rate of 401 g/(m<sup>2</sup> d), in which nearly 40% is contributed by daytime. This performance reaches approximately 70% of the theoretical maximum predicted using the near-ideal spectrum. We end by optimizing the layout of condensers in practical applications.</p>

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Photonic structures to achieve high-performance dew-harvesting in a 24-h day-night cycle

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Zheng Zhang,
  • Lining Dong,
  • Minghao Dong,
  • Shiting Ruan,
  • Zhen Chen

摘要

Although most prior research on the dew-harvesting technology has focused on nocturnal operations, achieving round-the-clock freshwater harvesting remains crucial. However, daytime dew-harvesting faces two key challenges as compared to its nighttime counterpart: the high solar irradiance and the large contrast between the ambient temperature and the dewpoint. To address these challenges and guide the photonic design, we develop a theoretical framework to analyse dew-harvesting in a 24-h day-night cycle. Using Nanjing as an example, our analyses reveal that, in the solar regime, a minimum average solar reflectivity of 0.92 is required; in the infrared regime, a 10% reduction in absorptivity outside the 8–13 µm transparency window is equivalent to a 5.9% enhancement in emissivity within the window. Guided by these findings, we propose a photonic design, which, in a synthetic experiment with measured meteorological datasets, achieves a water production rate of 401 g/(m2 d), in which nearly 40% is contributed by daytime. This performance reaches approximately 70% of the theoretical maximum predicted using the near-ideal spectrum. We end by optimizing the layout of condensers in practical applications.