Konferensartikel

Compressed Air Energy Storage (CAES) is a promising alternative for energy storage. An Adiabatic Compressed Air Energy Storage (A-CAES) system has been analysed in this paper, to store excess energy production from a wind turbine generator for up to one week. Compressed air is stored in a cavern of constant volume. The heat produced by the compression of the air during the charge process is stored in several packed beds and used later during discharge to reheat the air prior to energy production. This paper presents a preliminary thermodynamic analysis estimating the size of the system for a given quantity of energy storage, a dynamic model including packed beds for additional energy storage, and a simulation made in MATLAB to analyse the efficiency of the system. The A-CAES roundtrip efficiency is 53%. The physical limitations of the actual compressors and expanders were taken into account when defining the operational pressures and temperatures in the model. A preliminary capital cost estimation of the system was conducted for Norway, resulting in an estimated investing cost of approximately 2 700 NOK/kWh.

compressed air energy storage, adiabatic, thermal energy storage, packed bed, thermodynamic analysis