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Journal of Thermal Science

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2022 , Vol. 31 >Issue 6: 2329 - 2345

DOI: https://doi.org/10.1007/s11630-022-1713-7

燃烧和反应

Effect of Complex Parameters of Porous Media on Desalination Performance in Air-Gap Diffusion Distillation Based on Multiple Regression Analysis

  • CHEN Lele ,
  • WANG Ping ,
  • ZHANG Xuan ,
  • QIU Qinggang
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  • Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

网络出版日期: 2023-12-04

基金资助

This project is financially supported by the National Natural Science Foundation of China (No. 52176060, No. 51876023) and Dalian University of Technology 2021 Large-scale Instrument and Equipment Open Fund (No. DUTKFJJ2021041, No. DUTKFJJ2021044).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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Effect of Complex Parameters of Porous Media on Desalination Performance in Air-Gap Diffusion Distillation Based on Multiple Regression Analysis

  • CHEN Lele ,
  • WANG Ping ,
  • ZHANG Xuan ,
  • QIU Qinggang
Expand
  • Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

Online published: 2023-12-04

Supported by

This project is financially supported by the National Natural Science Foundation of China (No. 52176060, No. 51876023) and Dalian University of Technology 2021 Large-scale Instrument and Equipment Open Fund (No. DUTKFJJ2021041, No. DUTKFJJ2021044).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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摘要

气隙扩散蒸馏（AGDD）是一项旨在解决偏远地区居民安全饮水问题的新技术，它采用超亲水性多孔介质作为热流道和蒸发表面。在实验中发现，多孔介质的参数对AGDD的脱盐（蒸发）效率有显著的影响。尽管多孔介质被广泛用作蒸发组件，但影响其蒸发效率的因素尚不完全清楚。超亲水性多孔介质中的蒸发过程很少被讨论。本文基于AGDD进行了大量的实验。统计方法的引入解决了实验无法区分多孔介质复杂参数对蒸发效率具体影响的问题。采用逐步回归分析对自变量进行降维，构建回归方程（决定系数R2达到81.3-96.8%）。基于多孔介质参数建立蒸发通量关联式和无量纲传质关联式。我们发现超亲水多孔介质的表面蒸发可分为三个阶段：扩散蒸发、毛细管蒸发和热蒸发。这三个阶段的蒸发效率由蒸汽扩散阻力、毛细力和热量供应控制。在低饱和度下，蒸发效率受限于蒸汽扩散过程的阻力，多孔介质的蒸发效率主要受孔径、比表面积、孔隙率和特征长度的影响。在高饱和度下，蒸发效率主要受渗透率的影响。小厚度和高亲水性也可以提高蒸发效率。

关键词： Air-Gap Diffusion Distillation (AGDD); stepwise regression analysis; evaporation; super hydrophilic porous media; desalination

本文引用格式

CHEN Lele , WANG Ping , ZHANG Xuan , QIU Qinggang . Effect of Complex Parameters of Porous Media on Desalination Performance in Air-Gap Diffusion Distillation Based on Multiple Regression Analysis[J]. 热科学学报, 2022 , 31(6) : 2329 -2345 . DOI: 10.1007/s11630-022-1713-7

Abstract

Air-Gap Diffusion Distillation (AGDD) is a new technology aiming at solving the problem of the safety of drinking water for residents in remote areas that uses a super hydrophilic porous medium as the hot channel and evaporation surface. In the experiment, it was found that the parameters of porous media have a significant influence on the desalination (evaporation) efficiency of AGDD. Although porous media are widely used as evaporation components, the factors affecting their evaporation efficiency are not fully understood. The evaporation process in super hydrophilic porous media is rarely discussed. A large number of experiments have been carried out based on AGDD. The introduction of statistical methods solves the problem that experiments cannot distinguish the contribution of complex parameters of porous media to evaporation efficiency. Stepwise regression analysis is used to reduce the dimensionality of the independent variables and construct regression equations (coefficient of determination R2 reached 81.3%–96.8%). Evaporation flux correlations and dimensionless mass transfer correlations are established based on porous media parameters. We found that the surface evaporation of super hydrophilic porous media can be divided into three stages: diffusion evaporation, capillary evaporation, and thermal evaporation. The evaporation efficiency of these three stages is controlled by the vapor diffusion process resistance, capillary force, and energy supply. At low saturation, evaporation efficiency is limited by the resistance of the vapor diffusion process. The evaporation efficiency of the porous media is affected predominantly by the pore size, the specific surface area, porosity and the characteristic length. At high saturation, the evaporation efficiency becomes influenced primarily by the permeability. A small thickness and a high hydrophilicity also improve the evaporation efficiency.

Key words： Air-Gap Diffusion Distillation (AGDD); stepwise regression analysis; evaporation; super hydrophilic porous media; desalination

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