海水淡化
高效能源利用
工艺工程
工作(物理)
蒸发器
低温热脱盐
环境科学
节能
工程类
机械工程
热交换器
化学
生物化学
电气工程
膜
作者
Yushi Chen,Xiao Luo,Xiaokun Gu,Hua Bao
出处
期刊:Desalination
[Elsevier]
日期:2023-12-01
卷期号:568: 117000-117000
被引量:1
标识
DOI:10.1016/j.desal.2023.117000
摘要
Multistage interfacial desalination is a promising strategy to address global freshwater scarcity due to its ultra-high energy conversion efficiency. While numerous researches focus on materials improvement and system design, the underlying mechanisms of energy efficiency improvement are less explored. In this work, we establish a theoretical framework based on energy conservation and heat and mass transfer to comprehensively analyze the energy efficiency of multistage interfacial desalination. We demonstrate that there is an efficiency upper limit of 894 % under ideal conditions, which is mainly limited by the unavoidable sensible heat loss from the fresh water. Furthermore, we show that a typical ten-stage desalination system with a lab scale (10 cm × 10 cm) can reach a calculated efficiency of 232 %. An energy loss analysis allows us to identify another important heat transfer term, the wick where the evaporator takes seawater, which also causes significant heat loss. Experiments are conducted to show that better thermal insulation on wick can enhance energy efficiency. Moreover, we found that the system efficiency can be improved by enhancing the internal convective heat and mass transfer. This work provides insights into physical processes involved in multistage interfacial desalination and offers important guidance for further performance improvement towards its application.
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