Title

Exergy analysis of a small-scale trigenerative compressed air energy storage system

Document Type

Article

Publication Date

1-1-2021

Publication Title

Compressed Air Energy Storage: Types, systems and applications

First Page

193

Keywords

Destruction ratio, Exergy, Relative exergy, Small-scale, Trigeneration, Unavoidable

Last Page

226

Abstract

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%.

ISBN

9781839531958

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