Advanced exergy and exergo-economic analyses of an advanced adiabatic compressed air energy storage system

It is important to determine the source of the exergy destruction of the system components and their relations with each other in order to increase the working performance of energy charging systems. In this paper, con-ventional/advanced exergy and exergo-economic analyses of an advanced adiabatic compressed air energy storage (AA-CAES) system with a power output of 10 MW were performed. The results show that the proposed system accounts for 44 % of the exergy destruction and 31 % of the exergy destruction cost avoidable while 10 % of investment cost is avoidable. These percentage values represent the improvement potential for the system. Conventional exergy analysis results show that three most effective system components in exergy destruction as wind turbine, regulator and heat exchanger-3, respectively, while this order changes as wind turbine, compressor-1 and turbine-2 in advanced exergy analysis. This difference is due to technological limitations. In summary, advanced exergy analysis provides the designer with a detailed path regarding the improvement potential and cost savings of the system.