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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat and mass transfer in a polymeric electrolyte membrane-based electrochemical air dehumidification system: Model development and performance analysis
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Heat and mass transfer in a polymeric electrolyte membrane-based electrochemical air dehumidification system: Model development and performance analysis

机译：基于聚合物电解质膜的电化学空气除湿系统中的传热传质：模型开发和性能分析

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摘要

In this paper, a two-dimensional steady-state theoretical model was established, to model the internal transport phenomena in a polymeric electrolyte membrane-based (PEM-based) air dehumidification element. The influences of electrochemical reactions, activation and concentration over-potentials, and Ohmic and electro-osmotic effects were considered. The model was solved by the finite difference method with conjugate boundary conditions. So, with this model, the heat, mass and current transfer through the five layers of the element (diffusion layers, catalyst layers and a PEM) could be described theoretically, as well-as the convective heat and mass exchange with adjacent airflows. Compared with the results from previous models, this model showed a much closer trend to the experimental data. The overall error was less than 15%, with an acceptable average error of 8.6%. However, greater deviations were observed under larger airflow conditions, probably due to the assumption of laminar airflow and steady-state heat conduction. Furthermore, by the performance analysis, the maximum moisture gradient was found inside the PEM, so the PEM's parameters could largely affect the system performance. With the increase in PEM water content, the dehumidification was significantly enhanced, especially when the air humidity was high. If the PEM water content was doubled, the dehumidification rate was increased by 42%. Then, decreasing the PEM thickness also improved the performance. However, the effect became minor if the thickness was less than 100 gm. It was also helpful by increasing the PEM conductivity, although the effect of this variable was relatively small. This study provided theoretical guidance for further system improvement and material preparation for PEM-based dehumidification systems. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文建立了二维稳态理论模型，以模拟基于聚合物电解质膜（PEM）的空气除湿元件的内部传输现象。考虑了电化学反应，活化和浓度超电势以及欧姆和电渗透效应的影响。通过具有共轭边界条件的有限差分法求解该模型。因此，利用该模型，理论上可以描述通过元素的五层（扩散层，催化剂层和PEM）进行的热，质量和电流传递，以及与相邻气流的对流热和质量交换。与先前模型的结果相比，该模型显示出与实验数据更接近的趋势。总体误差小于15％，可接受的平均误差为8.6％。但是，在较大的气流条件下观察到较大的偏差，这可能是由于假设为层流和稳态热传导。此外，通过性能分析，可以在PEM内找到最大的水分梯度，因此PEM的参数可能在很大程度上影响系统性能。随着PEM含水量的增加，除湿效果显着增强，尤其是在空气湿度较高时。如果PEM的水含量增加一倍，则除湿率将提高42％。然后，减小PEM厚度也可以提高性能。然而，如果厚度小于100gm，则效果变得很小。尽管此变量的影响相对较小，但通过增加PEM电导率也有帮助。该研究为基于PEM的除湿系统的进一步系统改进和材料准备提供了理论指导。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第ptab期|888-898|共11页
  • 作者

    Qi Ronghui; Li Dujuan; Li Heyong; Wang Haihui; Zhang Li-Zhi;

  • 作者单位

    South China Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Educ Minist, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China;

    South China Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Educ Minist, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China;

    South China Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Educ Minist, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China;

    South China Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Educ Minist, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China;

    South China Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Educ Minist, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Electrolytic dehumidification; PEM; Model development; Heat and mass transfer;

    机译：电解除湿;PEM;模型开发;传热传质;

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