Boosting solar steam generation by structure enhanced energy management  

基于结构设计的能量调控提升太阳能光热蒸发

作　　者：Yida Wang Xuan Wu Bo Shao Xiaofei Yang Gary Owens Haolan Xu 王艺达;武萱;邵勃;杨小飞;欧文加里;徐浩兰(Future Industries Institute,University of South Australia,Mawson Lakes Campus Adelaide,SA 5095,Australia;College of Science.Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]Future Industries Institute,University of South Australia,Mawson Lakes Campus Adelaide,SA 5095,Australia [2]College of Science.Nanjing Forestry University,Nanjing 210037,China

出　　处：《Science Bulletin》2020年第16期1380-1388,M0004,共10页科学通报（英文版）

基　　金：financial support from Australian Research Council(ARC Future Fellowship FT190100485);University of South Australia(Foundation Fellow);China Scholarship Council and Huasheng Graphite Co.,Ltd。

摘　　要：Interfacial solar-steam generation is a promising and cost-effective technology for both desalination and wastewater treatment.This process uses a photothermal evaporator to absorb sunlight and convert it into heat for water evaporation.However solar-steam generation can be somewhat inefficient due to energy losses via conduction,convection and radiation.Thus,efficient energy management is crucial for optimizing the performance of solar-steam generation.Here,via elaborate design of the configuration of photothermal materials,as well as warm and cold evaporation surfaces,performance in solar evaporation was significantly enhanced.This was achieved via a simultaneous reduction in energy loss with a net increase in energy gain from the environment,and recycling of the latent heat released from vapor condensation,diffusive reflectance,thermal radiation and convection from the evaporation surface.Overall,by using the new strategy,an evaporation rate of 2.94 kg m^-2 h^-1,with a corresponding energy efficiency of solar-steam generation beyond theoretical limit was achieved.界面太阳能光热蒸发是一种既有潜力又经济的海水淡化和废水处理技术.这种技术通过光热材料吸收太阳光,将太阳光转化为热能并将其集中于材料表面进行水蒸发.然而,界面光热蒸发系统由于蒸发过程中的热传导、热对流和热辐射能量损失,使光热蒸发的能量效率降低.因此,高效的能量管理对提高和优化光热蒸发效率至关重要.本文通过对光热材料以及冷、热蒸发表面的精心构筑,使蒸发器的光热蒸发性能得到显著的提升.这是由于这种结构能够同时实现降低体系能量损失,增加从环境中吸取能量,回收利用蒸汽冷凝释放的潜热以及热蒸发表面的热对流和热辐射能量损失.总体来说,通过这种新颖的能量管理策略,该光热蒸发装置的蒸发速度达到了2.94 kg m^-2h^-1,其能量转化效率超过了理论极限值.

关 键 词：Solar-steam generation PHOTOTHERMAL Energy management Latent heat recycling Reduced graphene oxide DESALINATION 

分 类 号：TK519[动力工程及工程热物理—热能工程]