Performance Assessment of Low-Temperature A-CAES (Adiabatic Compressed Air Energy Storage) Plants

Abstract The widespread diffusion of renewable energy sources calls for the development high-capacity storage systems as A-CAES (Adiabatic Compressed Air Energy Storage) systems. In this framework, low temperature (100°C–200°C) (LT-ACAES) can assume a key role, avoiding some critical issues connected to operation high ones. paper, two different LT-ACAES configurations are proposed. characterized by same turbomachines and compressed air section, while differ in TES section its integration with turbomachinery. particular, first configuration includes separated cycles: working fluid (air) cycle heat transfer (HTF) cycle. Several exchangers connect cycles allowing recover thermal from compressors at turbine inlet. Two HTFs were considered: (case A) oil B). second is composed only one cycle, where operating HTF three packed-bed tanks C). directly each inlet, use exchangers. modelled simulated using ASPEN-Plus MATLAB-Simulink environments. main aim study was detailed analysis reciprocal influence between turbomachinery system; furthermore, performance evaluation plant carried out assuming both on-design off-design conditions. Finally, compared through parameters, such round-trip efficiency. A total power output around 10 MW set, leading tank volume ranging 500 700 m 3 . appears be most promising terms efficiency since produced during discharging phase greater. ranges 0.566 0.674 Although assures highest performance, effect very pressures inside should carefully evaluated overall costs.