Entropy parameters for desiccant wheel design

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    In this work a thermodynamic analysis of a desiccant wheel is proposed to investigate and identify the optimum size and operating regime of this device. A steady state entropy generation expression, based on effectiveness parameters suitable for desiccant wheels operability, is obtained applying a control volume approach and assuming perfect gas behaviour of the binary air-vapour mixture. A new entropy generation number NL is defined using a minimum indicative value of the entropy generation SL,min and investigated in order to obtain useful criteria for desiccant wheels optimization. The effectiveness-NTU design method is employed by combining solution of thermal exchange efficiency for rotary heat exchanger with the characteristic potential method, under the conditions of heat and mass transfer analogy. The analysis is applied to a specific desiccant wheel and NL variation with NTU is explored under various operative conditions and wheels characteristics in terms of dimensionless velocity and flow unbalance ratio.

    Original languageEnglish
    Pages (from-to)826-838
    Number of pages13
    JournalApplied Thermal Engineering
    Volume75
    DOIs
    Publication statusPublished - 2015 Jan 22

    Fingerprint

    Wheels
    Entropy
    Heat exchangers
    Ion exchange
    Mass transfer
    Vapors
    Thermodynamics
    Heat transfer
    Air
    Gases

    Keywords

    • Desiccant wheel
    • Entropy generation
    • Irreversibility
    • Thermodynamic analysis

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Industrial and Manufacturing Engineering

    Cite this

    Entropy parameters for desiccant wheel design. / Giannetti, Niccolo; Rocchetti, Andrea; Saito, Kiyoshi; Yamaguchi, Seiichi.

    In: Applied Thermal Engineering, Vol. 75, 22.01.2015, p. 826-838.

    Research output: Contribution to journalArticle

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