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Ultrahigh-efficiency desalination via a thermally-localized multistage solar still
Energy & Environmental Science ( IF 33.250 ) Pub Date : 2020/01/15 , DOI: 10.1039/c9ee04122b
Zhenyuan Xu; Lenan Zhang; Lin Zhao; Bangjun Li; Bikram Bhatia; Chenxi Wang; Kyle L. Wilke; Youngsup Song; Omar Labban; John H. Lienhard; Ruzhu Wang; Evelyn N. Wang

Passive vapor generation systems with interfacial solar heat localization enable high-efficiency low-cost desalination. In particular, recent progress combining interfacial solar heating and vaporization enthalpy recycling through a capillary-fed multistage architecture, known as the thermally-localized multistage solar still (TMSS), significantly improves the performance of passive solar desalination. Yet, state-of-the-art experimental demonstrations of solar-to-vapor conversion efficiency are still limited since the dominant factors and the general design principle for TMSS were not well-understood. In this work, we show optimizing the overall heat and mass transport in a multistage configuration plays a key role for further improving the performance. This understanding also increases the flexibility of material choices for the TMSS design. Using a low-cost and free-of-salt accumulation TMSS architecture, we experimentally demonstrated a record-high solar-to-vapor conversion efficiency of 385% with a production rate of 5.78 L m−2 h−1 under one-sun illumination, where more than 75% of the total production was collected through condensation. This work not only significantly improves the performance of existing passive solar desalination technologies for portable and affordable drinking water, but also provides a comprehensive physical understanding and optimization principle for TMSS systems.
更新日期:2020-02-13

 

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