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Compressed air energy storage (CAES) is one of the electric energy storage systems at a large scale. Recent numerical studies and in-situ pilot tests have demonstrated that lined rock caverns (LRC) is feasible for an underground storage space of the CAES even at a shallow depth. In this study, we investigated the influence of insulation and operational conditions of the LRC on its storage efficiency to optimize the economical feasibility and so as to include in designing specification and operational conditions of the caverns. In evaluating the efficiency, the energy balance equation developed by our previous study, where pressure and temperature estimation produced by TOUGH2 analysis were used as an input, was employed. From the analysis results, we showed that the effect of insulation condition was comparatively insignificant to a storage efficiency but, the efficiency can be improved when the duration of compression-injection period during a daily operation becomes longer, since the temperature variation inside the LRC is reduced under these conditions.

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Influence of Insulation Characteristics and Operational Modes on the Storage Efficiency in Underground Caverns for Compressed Air Energy Storage (CAES)