Exergy analysis of a small-scale trigenerative compressed air energy storage system
Compressed Air Energy Storage: Types, systems and applications
Destruction ratio, Exergy, Relative exergy, Small-scale, Trigeneration, Unavoidable
Trigenerative compressed air energy storage (T-CAES) capitalizes on the heat of the compression process, something that is often wasted in more conventional compressed air energy storage (CAES) approaches. A T-CAES system with a 4 kW compressor and 2 kW turbine is thermodynamically analyzed in this study. Exergy analyses performed on each component in the system identify specific areas for improvement. It is found that, under actual conditions, more than half of the total exergy destruction is caused by the accumulator and about a quarter of the destruction is caused by the pressure regulator and turbine. Further, the pressure regulator, accumulator, and turbine offer 66%, 27%, and 32% of individual component recoverable exergies, respectively. These recoveries can improve the overall exergy efficiency of the system by 35%.
Sarath Dittakavi, Raghuveera Sai; Ting, David S.K.; Carriveau, Rupp; and Ebrahimi, Mehdi. (2021). Exergy analysis of a small-scale trigenerative compressed air energy storage system. Compressed Air Energy Storage: Types, systems and applications, 193-226.