Thermodynamic optimization of three-thermal irreversible systems

Niccolo Giannetti, Andrea Rocchetti, Kiyoshi Saito

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    Multi-temperature-level systems enlarge the prospects and degrees of freedom for an effective design and an environment-friendly use of energy. Based on a general thermodynamic model of three-thermal cycles and finite thermal capacity of the heat sources, this paper aims at the analysis and the performance optimization of these systems by considering the influence of irreversibility. Suitable dimensionless parameters for an overall optimization are introduced and their influence on the cycle efficiency is investigated. This approach identifies the limitations imposed to the physical processes by accounting for the inevitable dissipation due to their constrained duration and intensity, and constitutes a general thermodynamic criterion for the optimization of three-thermal irreversible systems. Dependence on the main factors is highlighted in a way that shows how to change them in order to improve the overall efficiency. Under this point of view, the analysis evaluates COP improvements and can be used to perform plant diagnostics, besides predicting the system performance. The use of this criterion is exemplified for the absorption chiller application case.

    Original languageEnglish
    Pages (from-to)S83-S90
    JournalInternational Journal of Heat and Technology
    Volume34
    DOIs
    Publication statusPublished - 2016 Jan 1

    Fingerprint

    Thermodynamics
    thermodynamics
    optimization
    cycles
    heat sources
    Specific heat
    dissipation
    degrees of freedom
    Hot Temperature
    Temperature
    temperature
    energy

    Keywords

    • Dimensionless parameters
    • Efficiency improvement
    • Irreversibility
    • Thermodynamic optimization
    • Three-thermal systems

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Fluid Flow and Transfer Processes

    Cite this

    Thermodynamic optimization of three-thermal irreversible systems. / Giannetti, Niccolo; Rocchetti, Andrea; Saito, Kiyoshi.

    In: International Journal of Heat and Technology, Vol. 34, 01.01.2016, p. S83-S90.

    Research output: Contribution to journalArticle

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