Pilot-scale demonstration of advanced adiabatic compressed air energy storage, Part 1: Plant description and tests with sensible thermal-energy storage

Geissbühler, Lukas and Becattini, Viola and Zanganeh, Giw and Zavattoni, Simone and Barbato, Maurizio and Haselbacher, Andreas and Steinfeld, Aldo (2018) Pilot-scale demonstration of advanced adiabatic compressed air energy storage, Part 1: Plant description and tests with sensible thermal-energy storage. UNSPECIFIED. Journal of Energy Storage, 17. pp. 129-139. ISSN 2352-152X (In Press)

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Abstract

Experimental and numerical results from the world's first advanced adiabatic compressed air energy storage (AA-CAES) pilot-scale plant are presented. The plant was built in an unused tunnel with a diameter of 4.9 m in which two concrete plugs delimited a mostly unlined cavern of 120 m length. The sensible thermal-energy storage (TES) with a capacity of 12 MWh th was placed inside the cavern. The pilot plant was operated with charging/discharging cycles of various durations, air temperatures of up to 550 C, and maximum cavern gauge pressures of 7 bar. Higher pressures could not be reached because of leaks that were traced mainly to the concrete plugs. Simulations using a coupled model of the TES and cavern showed good agreement with measurements. Cycle energy efficiencies of the TES were determined to lie between 76% and 90%. The estimated round-trip efficiency of the pilot plant was based on the measured TES performance and estimated performances of the other components, yielding values of 63-74%, which compares favorably with the usually quoted values of 60-75% for prospective AA-CAES plants.

Item Type:	Scientific journal article, Newspaper article or Magazine article
Uncontrolled Keywords:	Advanced adiabatic compressed air energy storage, Thermal-energy storage, Packed bed, Pilot plant, Simulation
Subjects:	Engineering > Mechanical engineering > Dynamics > Thermodynamics Engineering > Chemical, process & energy engineering > Chemical, process & energy engineering not elsewhere classified
Department/unit:	Dipartimento tecnologie innovative > Istituto di ingegneria meccanica e tecnologia dei materiali
Depositing User:	Maurizio Barbato
Date Deposited:	23 Mar 2018 10:02
Last Modified:	23 Mar 2018 10:02
URI:	http://repository.supsi.ch/id/eprint/9422

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