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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    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.

    Original languageEnglish
    Title of host publication24th IIR International Congress of Refrigeration, ICR 2015
    PublisherInternational Institute of Refrigeration
    Pages786-793
    Number of pages8
    ISBN (Electronic)9782362150128
    DOIs
    Publication statusPublished - 2015
    Event24th IIR International Congress of Refrigeration, ICR 2015 - Yokohama, Japan
    Duration: 2015 Aug 162015 Aug 22

    Other

    Other24th IIR International Congress of Refrigeration, ICR 2015
    CountryJapan
    CityYokohama
    Period15/8/1615/8/22

    ASJC Scopus subject areas

    • Control and Systems Engineering
    • Electrical and Electronic Engineering
    • Mechanical Engineering
    • Condensed Matter Physics

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  • Cite this

    Giannetti, N., Rocchetti, A., Saito, K., & Yamaguchi, S. (2015). Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube. In 24th IIR International Congress of Refrigeration, ICR 2015 (pp. 786-793). International Institute of Refrigeration. https://doi.org/10.18462/iir.icr.2015.0466