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Appl. Sci. 2020, 10, 8341 15 of 17 uncovers the real improvement potential and identifies heat exchanger 3 as the eighth component to be improved, amending the misleading conclusion deduced based on conventional exergy analysis results. The overall system exergy efficiency is 74.79% under the unavoidable condition, indicating a great improvement potential to the CCHP system based on TC-CCES. (3) Sensitivity analysis demonstrates that an increase in turbomachinery efficiency and a reduction of pinch temperature in the heat exchanger and cold storage within technological permission benefits the system characteristics in terms of decreasing exergy destruction and increasing system exergy efficiency. Moreover, the efficiency in turbine keeps a higher influence on overall system exergy destruction than compressor efficiency. In addition, a smaller pressure drop in throttle valve 2 and a larger storage pressure are helpful for improving system exergy efficiency, and there exists optimum value through evaluating compressor inlet pressure and ambient temperature. The application of advanced exergy analysis to the CCHP system based on TC-CCES provides more valuable and detailed information for the optimization of the system. The advanced exergy analysis can be considered as a meaningful supplement to the conventional exergy analysis. Author Contributions: Conceptualization, W.S. and Z.L.; methodology, W.S. and Z.L.; validation, W.S. and Z.L.; formal analysis, W.S. and Z.L.; writing—original draft preparation, W.S.; writing—review and editing, Z.L. All authors have read and agreed to the published version of the manuscript. Funding: This research received no external funding. Conflicts of Interest: The authors declare no conflict of interest. Nomenclature Symbols . W power (kW) ε exergy efficiency ∆ change quantity h specific enthalpy (kJ/kg) m. mass flow rate (kg/s) Subscripts . Q heat transfer rate (kW) τ temperature (K) . E exergy flow rate (kW) s specific entropy (kJ/kg.K) e specific exergy flow rate (J/kg) y exergy destruction ratio y* relative exergy destruction p pressure (MPa) Abbreviations C compressor is isentropic T turbine i inlet e exit CO2 carbon dioxide LST low-pressure storage tank HST high-pressure storage tank CS cold storage hot high-temperature stream cold low-temperature sream j stream number 0 ambient state F fuel P product D destruction k the k-th component tot total L loss CAES compressed air energy storage AA-CAES advanced adiabatic CAES CCHP combined cooling, heating and power CO2 carbon dioxide CCES compressed CO2 energy storage TC-CCES transcritical CCES C compressor T turbine HE heat exchanger HST high-pressure storage tank TV throttle valve Superscripts CS cold storage LST low-pressure storage tank CR cooler CFT cold fluid tank HFT hot fluid tank Greeks η efficiency PH physical τ thermal M mechanical AV avoidable UN unavoidable EN endogenous EX exogenousPDF Image | Advanced Performance of a CO2 Energy Storage Based Trigen
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