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Thermodynamic analysis of a hybrid energy storage system based on compressed air and liquid air

Kantharaj, Bharath; Garvey, Seamus D.; Pimm, Andrew James

Authors

Seamus D. Garvey

Andrew James Pimm



Abstract

As renewable electricity generation capacity increases, energy storage will be required at larger scales. Compressed air energy storage at large scales, with effective management of heat, is recognised to have potential to provide affordable grid-scale energy storage. Where suitable geologies are unavailable, compressed air could be stored in pressurised steel tanks above ground, but this would incur significant storage costs. Liquid air energy storage, on the other hand, does not need a pressurised storage vessel, can be located almost anywhere, and has a relatively large volumetric exergy density at ambient pressure. However, it has lower roundtrip efficiency than compressed air energy storage technologies. This paper analyses a hybrid energy store consisting of a compressed air store at ambient temperature, and a liquid air store at ambient pressure. Thermodynamic analyses are then carried out for the conversions from compressed air to liquid air (forward process) and from liquid air to compressed air (reverse process), with notional heat pump and heat engine systems, respectively. Preliminary results indicate that provided the heat pump/heat engine systems are highly efficient, a roundtrip efficiency of 53% can be obtained. Immediate future work will involve the detailed analysis of heat pump and heat engine systems, and the economics of the hybrid energy store.

Journal Article Type Article
Publication Date Sep 1, 2015
Journal Sustainable Energy Technologies and Assessments
Print ISSN 2213-1388
Electronic ISSN 2213-1388
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 11
APA6 Citation Kantharaj, B., Garvey, S. D., & Pimm, A. J. (2015). Thermodynamic analysis of a hybrid energy storage system based on compressed air and liquid air. Sustainable Energy Technologies and Assessments, 11, https://doi.org/10.1016/j.seta.2014.11.002
DOI https://doi.org/10.1016/j.seta.2014.11.002
Keywords Compressed air energy storage, Liquid air energy storage, Exergy
Publisher URL http://www.sciencedirect.com/science/article/pii/S2213138814000952
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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