Thermal and exergetic analysis of Metal Foam-enhanced Cascaded Thermal Energy Storage (MF-CTES)

Yuan Tian, C.Y. Zhao

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    Abstract

    Metal Foam-enhanced Cascaded Thermal Energy Storage (MF-CTES) has been proposed to solve the problem of poor heat transfer during heat exchange process, which is caused by unavoidable decrease of temperature differences. This paper conducts a theoretical study examining the overall thermal performance of Single-stage Thermal Energy Storage (STES), Cascaded Thermal Energy Storage (CTES) and MF-CTES, with both heat exchange rate and exergy efficiency being considered. The main findings are: heat exchange rate of STES is improved by CTES (up to 30%), and is further improved by MF-CTES (by 2–7 times); exergy efficiency of STES cannot be significantly improved by CTES (−15% to +30%), nor by MF-CTES; exergy transfer rate of STES is increased by CTES (up to 23%), and is further increased by MF-CTES (by 2–7 times).
    Original languageEnglish
    Pages (from-to)86-96
    Number of pages11
    JournalInternational Journal of Heat and Mass Transfer
    Volume58
    Issue number1-2
    Early online date7 Dec 2012
    DOIs
    Publication statusPublished - Mar 2013

    Keywords

    • Metal foam; Heat transfer enhancement; Exergy; Cascaded Thermal Energy Storage; Brinkman–Forchheimer; Enthalpy method

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