Methods of analyzing the mass and energy storage efficiency of a compressed-air energy storage system(CAES), along with evaluation methods of thermodynamic behavior and operational safety of it have been developed and applied to the results of feasibility test of a pilot CAES cavern. A simple test of pressurizing the storage cavern by a compressor and measuring pressure and temperatures of the supply air and of the stored air along with rock temperature allows analysis of performance and efficiency of general CAES system. While it is recognized that the mechanical strength and aerodynamic tightness are of prime importance in terms of efficiency and safety, the energy loss to the surrounding rock due to heat conduction is found also significant heat insulation should receive as serious attention.
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