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====The present state and future prospects for advanced adiabatic compressed air energy storage====
*'''Authors:''' Giuseppe Grazzini (University of Florence, Italy), Adriano Milazzo (University of Florence, Italy) 
*'''Contact email:''' adriano.milazzo@unifi.it
*'''Scope:''' Adiabatic compressed air energy storage represents a valuable and environmental friendly option for massive energy storage. Some examples in this field refer to underground storage at medium pressure level. In view of a widespread utilization, independent from the availability of underground storage volumes, an artificial reservoir is required. This prompts for rather high air pressure within the storage, which in turn requires carefully optimized recovery of the thermal energy released in the compression phase. Starting from a thermodynamic tutorial of the relevant design parameters and their influence on the system efficiency, we propose a comprehensive set of criteria for the design of the system; with particular attention on heat transfer devices. A possible application within a wind energy plant is analyzed.