Adiabatic compressed air energy storage systems
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Loughborough UniversityIssue Date
2022-03-30Subjects
energy storagecompressed air energy storage
thermal energy storage
Subject Categories::J910 Energy Technologies
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Encyclopaedia for Energy StorageAbstract
Adiabatic Compressed Air Energy Storage (ACAES) is a thermo-mechanical storage concept that utilizes separate mechanical and thermal exergy storages to transfer energy through time. In this document, a short technology evolution report is followed by a complete thermodynamic modelling, in which frequently used components are addressed under energy and exergy viewpoints. Then, the recent commercial CAES projects and future ACAES challenges have been investigated, resulting in several identified outstanding challenges still to overcome in order to establish ACAES position as a major contender as a large-scale energy storage system.Citation
Barbour E, Pottie DL (2022) 'Adiabatic compressed air energy storage systems', in Cabeza LF (ed(s).). Encyclopaedia fo Energy Storage, Volume 2, : Elsevier pp.188-203.Publisher
ElsevierType
Book chapterLanguage
enISBN
9780128197301Scopus Count
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Why is adiabatic compressed air energy storage yet to become a viable energy storage option?Recent theoretical studies have predicted that adiabatic compressed air energy storage (ACAES) can be an effective energy storage option in the future. However, major experimental projects and commercial ventures have so far failed to yield any viable prototypes. Here we explore the underlying reasons behind this failure. By developing an analytical idealized model of a typical ACAES design, we derive a design-dependent efficiency limit for a system with hypothetical, perfect components. This previously overlooked limit, equal to 93.6% under continuous cycling for a typical design, arises from irreversibility associated with the transient pressure in the system. Although the exact value is design dependent, the methodology we present for finding the limit is applicable for a wide range of designs. Turning to real systems, the limit alone does not fully explain the failure of practical ACAES research. However, reviewing the available evidence alongside our analytical model, we reason that underestimation of th
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