Thermodynamic analysis of irreversible desiccant systems

    Research output: Contribution to journalArticle

    Abstract

    A new general thermodynamic mapping of desiccant systems' performance is conducted to estimate the potentiality and determine the proper application field of the technology. This targets certain room conditions and given outdoor temperature and humidity prior to the selection of the specific desiccant material and technical details of the system configuration. This allows the choice of the operative state of the system to be independent from the limitations of the specific design and working fluid. An expression of the entropy balance suitable for describing the operability of a desiccant system at steady state is obtained by applying a control volume approach, defining sensible and latent effectiveness parameters, and assuming ideal gas behaviour of the air-vapour mixture. This formulation, together with mass and energy balances, is used to conduct a general screening of the system performance. The theoretical advantage and limitation of desiccant dehumidification air conditioning, maximum efficiency for given conditions constraints, least irreversible configuration for a given operative target, and characteristics of the system for a target efficiency can be obtained from this thermodynamic mapping. Once the thermo-physical properties and the thermodynamic equilibrium relationship of the liquid desiccant mixture or solid coating material are known, this method can be applied to a specific technical case to select the most appropriate working medium and guide the specific system design to achieve the target performance.

    Original languageEnglish
    Article number595
    JournalEntropy
    Volume20
    Issue number8
    DOIs
    Publication statusPublished - 2018 Aug 1

    Fingerprint

    desiccants
    thermodynamics
    dehumidification
    air conditioning
    working fluids
    mass balance
    thermophysical properties
    ideal gas
    thermodynamic equilibrium
    configurations
    systems engineering
    rooms
    humidity
    screening
    vapors
    entropy
    coatings
    formulations
    fluids
    air

    Keywords

    • Desiccant systems
    • Entropy balance
    • Thermodynamic mapping

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Thermodynamic analysis of irreversible desiccant systems. / Giannetti, Niccolo; Yamaguchi, Seiichi; Rocchetti, Andrea; Saito, Kiyoshi.

    In: Entropy, Vol. 20, No. 8, 595, 01.08.2018.

    Research output: Contribution to journalArticle

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