Capillary-Flow-Optimized Heat Localization Induced by an Air-Enclosed Three-Dimensional Hierarchical Network for Elevated Solar Evaporation
Capillary-Flow-Optimized Heat Localization Induced by an Air-Enclosed Three-Dimensional Hierarchical Network for Elevated Solar Evaporation
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由空气封闭三维分层网络引起的毛细管流优化热局部化，用于提高太阳能蒸发。
DOI：
10.1021/acsami.8b21800
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发表时间：
2019
影响因子：
9.5
通讯作者：
Qu Jiuhui
中科院分区：
文献类型：
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作者：
Zhang Wei;Zhang Gong;Ji Qinghu;Liu Huijuan;Liu Ruiping;Qu Jiuhui
太阳能蒸发是利用可再生能源获得清洁水的一种经济有效的方法。然而，许多太阳能蒸发装置的性能仍不理想，吸收的太阳能利用效率低下。在此基础上，对太阳能蒸发进行了数值模拟，结果表明热管理是影响太阳能蒸发效率的关键因素。通过在实验室和中试规模的研究中使用双层太阳能蒸汽发生结构[中空玻璃微球-炭黑（HS-CB）]，这一预测得到了证实。HS-CB由CB膜作为太阳热转换层和三维层次化聚偏氟乙烯骨架交联hs作为热定位和水输送层组成。通过调整保温层的孔隙率，可以达到保温隔热和毛细管驱动的水分输送之间的平衡，从而实现优化的热局部化。在实验室中，该结构在1个太阳辐照度（1 kW m-2）下的蒸发效率为82.1%，在中试研究中甚至可以稳定地从高浓度工业废水中产生4.63 L m-2d-1（平均效率为37%）的纯净水，显示了其在海水淡化和微咸水净化方面的应用潜力。
Solar evaporation is a cost-effective way for obtaining clean water using renewable energy. However, many solar evaporation devices still show unsatisfactory performance and suffer from inefficient utilization of absorbed solar energy. Herein, numerical simulations of solar evaporation demonstrate that the heat management is a key factor governing the solar evaporation efficiency. This prediction is confirmed through using a bilayered solar steam generation architecture [hollow glass microsphere–carbon black (HS–CB)] both in laboratory- and pilot-scale studies. The HS–CB consists of a CB film as a solar-thermal conversion layer and three-dimensional hierarchical polyvinylidene fluoride skeleton cross-linking HSs as a heat localization and water-transporting layer. A balance between thermal insulation and capillary-driven water transport can be reached by tuning the porosity of the thermal-insulating layer, thus inducing optimized heat localization. The proposed structure evaporates water with an efficiency of 82.1% under 1 sun irradiance (1 kW m–2) in the laboratory and can even stably produce 4.63 L m–2d–1(average efficiency of 37%) of purified water from highly concentrated industrial waste water in the pilot study, demonstrating its promising potential for applications in seawater desalination and brackish water purification.