Abstract
In the present study a liquid carbon dioxide energy storage system with 10 MW output power production is analyzed thermo-economically by utilizing conventional and advanced exergy-based analysis. New exergy-based concepts such as unavoidable/avoidable and endogenous/exogenous exergy destruction, exergy destruction costs and investment costs as well as the combination of the two concepts are introduced to provide valuable knowledge about the interchanges among system components and the true latent capacity for improvement of each significant system component. It is demonstrated from the overall system analysis that the avoidable endogenous value is only 42.1% for total exergy destruction, 43.42% for total exergy destruction costs and 55.43% for total investment costs in the proposed system. Results from conventional exergy analysis suggest that the compressor contributes the utmost influence to the overall exergy destruction, while results from both the advanced exergy and exergoeconomic evaluation introduce the expander as the most significant component that has the highest improvement priority. In brief, the advanced exergy-based analyses can enhance engineers perception on the processes of energy conversion in the proposed system and also can improve the quality of the conclusions.
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