Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube

    研究成果: Conference contribution

    抄録

    This study is based on a numerical analysis of water vapour absorption in a laminar, gravity driven, viscous, incompressible liquid film of LiBr-H2O solution, flowing over a horizontal cooled tube. The hydrodynamic description is based on Nusselt boundary layer assumptions. A local entropy generation calculation can be performed referring to velocity, temperature and concentration fields. From a general form of volumetric entropy generation, a suitable expression for the absorption process has been obtained and different irreversibility sources have been highlighted. The impact of each term (fluid friction, heat transfer, mass transfer and their coupling effects) has been locally examined. Results have been explored for different tube radii, wall temperatures and operative conditions (representing both chiller and heat transformer configurations), in order to characterise the process from a second law point of view and establish a criterion for the optimisation of the absorber.

    本文言語English
    ホスト出版物のタイトル24th IIR International Congress of Refrigeration, ICR 2015
    出版社International Institute of Refrigeration
    ページ786-793
    ページ数8
    ISBN(電子版)9782362150128
    DOI
    出版ステータスPublished - 2015
    イベント24th IIR International Congress of Refrigeration, ICR 2015 - Yokohama, Japan
    継続期間: 2015 8月 162015 8月 22

    Other

    Other24th IIR International Congress of Refrigeration, ICR 2015
    国/地域Japan
    CityYokohama
    Period15/8/1615/8/22

    ASJC Scopus subject areas

    • 制御およびシステム工学
    • 電子工学および電気工学
    • 機械工学
    • 凝縮系物理学

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