Salt-rejecting continuous passive solar thermal desalination via convective flow and thin-film condensation
Salt-rejecting continuous passive solar thermal desalination via convective flow and thin-film condensation
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DOI：
10.1016/j.xcrp.2023.101682
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发表时间：
2023-05
影响因子：
8.9
通讯作者：
Patrick I. Babb;S. Ahmadi;Forrest Brent;Ruby Gans;M. Lopez;Jiuxu Song;Qixian Wang;Brandon Zou;Xiang-Yun Zuo;A. Strom;Jaya M. Nolt;Tyler Susko;K. Fields;Yangying Zhu
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作者：
Patrick I. Babb;S. Ahmadi;Forrest Brent;Ruby Gans;M. Lopez;Jiuxu Song;Qixian Wang;Brandon Zou;Xiang-Yun Zuo;A. Strom;Jaya M. Nolt;Tyler Susko;K. Fields;Yangying Zhu
被动式太阳能脱盐是一种新兴的低成本淡水生产技术。现有技术的脱盐器通常使用芯吸结构来蒸发水以实现高的太阳能-蒸汽效率。然而，芯吸结构具有有限的脱盐能力，这通常将操作持续时间限制为几个小时。此外，很少有研究表明有效的冷凝可以实现高的太阳能-水效率。在这里，我们报告了一个被动倒置单级太阳能脱盐器，实现连续脱盐和高效冷凝对流介导的盐扩散和一种新的模式的薄膜冷凝。我们实验证明了创纪录的高连续被动脱盐和盐拒绝测试持续时间为168小时（7天）下一个太阳照明。我们的脱盐器实现了0.5 kg m− 2 h −1的水收集率，相当于32.9%的太阳能-水效率。此外，我们开发了一个理论传输模型，并进行参数研究，以指导进一步优化。这项工作意味着目前最先进的脱盐器的鲁棒性的改进。
Passive solar desalination is an emerging low-cost technology for freshwater production. State-of-the-art desalinators typically evaporate water using wicking structures to achieve high solar-to-vapor efficiency. However, wicking structures have limited salt rejection capability, which typically limits the operating duration to several hours. In addition, few studies have demonstrated efficient condensation to achieve a high solar-to-water efficiency. Here, we report a passive inverted single-stage solar desalinator that achieves continuous desalination and efficient condensation by convection-mediated salt diffusion and a novel mode of thin-film condensation. We experimentally demonstrate a record-high continuous passive desalination and salt rejection test duration of 168 h (7 days) under one-sun illumination. Our desalinator achieves a water collection rate of 0.5 kg m−2h−1, which corresponds to a 32.9% solar-to-water efficiency. Furthermore, we develop a theoretical transport model and perform a parametric study to guide further optimization. This work signifies an improvement in the robustness of current state-of-the-art desalinators.