A photothermal reservoir for highly efficient solar steam generation without bulk water

论文摘要

A solid photothermal reservoir is designed to implement solar-steam generation in the absence of bulk water. The photothermal reservoir is composed of a water absorbing core encapsulated by a photothermal reduced graphene oxide based aerogel sheet which absorbs light and converts it into heat thus evaporating the stored water. The photothermal reservoir is able to store 6.5 times its own weight in water,which is sufficient for one day solar evaporation, thus no external water supplement is required. During solar-steam generation, since no bulk water is involved, the photothermal reservoir minimizes heat conduction loss, and maximizes both of the exposed evaporation surface area and net energy gain from the environment, leading to an energy efficiency beyond the theoretical limit. An extremely high water evaporation rate of 4.0 kg m-2h-1（normalized to projection area） is achieved in laboratory studies over a cylinder photothermal reservoir with a diameter of 5.2 cm and a height of 15 cm under 1.0 sun irradiation. Practical evaluation of the photothermal reservoir outdoors as part of a desalination device demonstrates a similar evaporation rate where the salinity of the clean water produced is lower than 24 ppb.Thus the photothermal reservoir shows great potential for real world applications in portable solarthermal desalination.

论文目录

文章来源

类型: 期刊论文

作者: Xuan Wu,Ting Gao,Chenhui Han,Jingsan Xu,Gary Owens,Haolan Xu

来源: Science Bulletin 2019年21期

年度: 2019

分类: 基础科学,工程科技Ⅱ辑

专业: 新能源

单位: Future Industries Institute, University of South Australia, Mawson Lakes Campus,School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology

基金: the financial support from University of South Australia,Australia,Huasheng Graphite Co.,Ltd.,China

分类号: TK511

页码: 1625-1633

总页数: 9

文件大小: 4879K

下载量: 37

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