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首页> 外文期刊>Building and Environment >Investigation on the dehumidification performance of LiCl/H_2O-MWNTs nanofluid in a falling film dehumidifier
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Investigation on the dehumidification performance of LiCl/H_2O-MWNTs nanofluid in a falling film dehumidifier

机译：LiCl / H_2O-MWNTs纳米流体在降膜除湿机中的除湿性能研究

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摘要

Nanofluids could enhance both the heat and mass transfer performance due to its outstanding thermal properties. However, most previous studies only focused on the heat transfer while the mass transfer performance of nanofluids is seldom examined. In the paper, it proposed a novel LiCl/H2O-MWNTs nanofluid for dehumidification by adding multi -walled carbon nanotubes (MWNTs) into Lithium chloride (LiCl) solution. The stable LiCl/water-MWNTs nanofluid was prepared by adding surfactant polyvinyl pyrrolidone (PVP) through mechanical methods. The concentration of MWNTs and PVP were 0.1 wt% and 0.4 wt% respectively. The influences of various parameters on dehumidification performance of LiCl/H2O solution, LiCl/H2O-PVP solution and LiCl/H2O-MWNTs nanofluid were investigated and compared. The experimental results show that LiCl/H2O-PVP solution and nanofluid can enhance the dehumidification rate by up to 26.1% and 25.9% as a result of contact angle reduction. The contact angles decrease from 58.5 for LiCl solution to 28 and 26.5 for the two modified solutions respectively, the wetting areas increase from 0.172 m(2) to 0.209 m(2) and 0.210 m(2), and the film thickness reduces from 0.681 mm to 0.583 mm and 0.577 mm correspondingly. However, the dehumidification enhancement of nanofluid can be only attributed to the adding of surfactant, and the adding of 0.1 wt% MWNTs has undetected effect on the dehumidification performance in the present study. The results can provide some guidance for the mass transfer enhancement in liquid desiccant dehumidification in terms of adding surfactant and nanoparticle.
机译：纳米流体由于其出色的热性能而可以增强传热和传质性能。然而，大多数先前的研究仅关注传热，而很少检查纳米流体的传质性能。通过将多壁碳纳米管（MWNTs）添加到氯化锂（LiCl）溶液中，提出了一种新型的用于除湿的LiCl / H2O-MWNTs纳米流体。通过机械方法添加表面活性剂聚乙烯吡咯烷酮（PVP），制备稳定的LiCl /水-MWNTs纳米流体。 MWNT和PVP的浓度分别为0.1重量％和0.4重量％。研究并比较了各种参数对LiCl / H2O溶液，LiCl / H2O-PVP溶液和LiCl / H2O-MWNTs纳米流体的除湿性能的影响。实验结果表明，由于接触角的减小，LiCl / H2O-PVP溶液和纳米流体可以使除湿率分别提高26.1％和25.9％。接触角分别从LiCl溶液的58.5减小到两种改性溶液的28和26.5，润湿面积从0.172 m（2）增大到0.209 m（2）和0.210 m（2），膜厚从0.681减小毫米至0.583毫米和0.577毫米。然而，纳米流体的除湿增强只能归因于表面活性剂的添加，而在本研究中，添加0.1 wt％MWNTs对除湿性能没有影响。研究结果可以为添加表面活性剂和纳米颗粒方面的液体干燥剂除湿的传质提供一些指导。

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  • 来源
    《Building and Environment》 |2018年第7期|8-16|共9页
  • 作者

    Wen Tao; Lu Lin; Zhong Hong;

  • 作者单位

    Hong Kong Polytech Univ, Dept Bldg Serv Engn, Renewable Energy Res Grp, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Polytech Univ, Dept Bldg Serv Engn, Renewable Energy Res Grp, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Polytech Univ, Dept Bldg Serv Engn, Renewable Energy Res Grp, Hong Kong, Hong Kong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Surfactant; MWNTs; Nanofluid; Dehumidification; Falling film;

    机译：表面活性剂;多壁碳纳米管;纳米流体;除湿;降膜;

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