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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.05398 |
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| _version_ | 1866918013623599104 |
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| author | Zhang, Zheng Dong, Lining Dong, Minghao Ruan, Shiting Chen, Zhen |
| author_facet | Zhang, Zheng Dong, Lining Dong, Minghao Ruan, Shiting Chen, Zhen |
| contents | 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 analyze 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 um 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 313 g/m2-day, in which nearly 40% is contributed by daytime. This performance reaches approximately 70% of the theoretical maximum predicted using the ideal spectrum. We end by optimizing the layout of condensers in practical applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05398 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Photonic Structures to Achieve High-Performance Dew-Harvesting in a 24-h Day-Night Cycle Zhang, Zheng Dong, Lining Dong, Minghao Ruan, Shiting Chen, Zhen Optics Applied Physics 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 analyze 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 um 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 313 g/m2-day, in which nearly 40% is contributed by daytime. This performance reaches approximately 70% of the theoretical maximum predicted using the ideal spectrum. We end by optimizing the layout of condensers in practical applications. |
| title | Photonic Structures to Achieve High-Performance Dew-Harvesting in a 24-h Day-Night Cycle |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2505.05398 |