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Appl. Sci. 2020, 10, 8341 3 of 17 the conventional one. More importantly, the advanced exergy analysis tends to clear, potentially, the misleading deductions obtained from the conventional exergy analysis. Based on the literature survey, several papers in the literature deal with the CAES-based CCHP system; only one is concerned on the CCHP system based on CCES, which is developed by authors [38]. Main investigation of the previous work is about the energy efficiency of the CCES-based CCHP system by using the first law of thermodynamics. As a further study, the focus of the present work is to pioneer the advanced exergy analysis of the CCES-based CCHP system. Splitting the component exergy destruction is clearly described. A particular focus is the sensitivity examination of the system to analyze the impacts of some key parameters on system performance. This advanced approach overcomes the most important limitations of a conventional exergetic analysis and, therefore, assists engineers in better understanding how thermodynamic inefficiencies are formed. Conventional exergy analyses only quantify the exergy destruction in different components, but cannot shed light on the interactions between components, while advanced exergy analyses overcome this weakness and uncover more of the accessible potential of the system. 2. Analysis Methods The schematic diagram of CCES-based CCHP system is depicted in Figure 1, which is composed mainly by two compressors (C), two turbines (T), four heat exchangers (HE), two gas storage tanks (HST and LST), three thermal medium storage tanks (HFT and CFT) and two valves (TV). The pressured water is employed in this work as the thermal storage medium. The system running process is clearly given as follows. Figure 1. Schematic of the CCES-based CCHP system. In the charging stage, the liquid CO2 from LST is first cooled by the throttling action through TV1 to guarantee the CS (cold storage) function, and then is evaporated to gaseous state. The cold energy released is preserved in CS. Afterwards, the gaseous CO2 is compressed to supercritical state powered by abundant electrical power, and is finally stored with supercritical state in HST. Meanwhile, the compression heat absorbed by water in HE1 can be offered to heat user, and the recovered heat by HE2 is stored in HFT1. In the discharging stage, the supercritical CO2 in high pressure passes through TV2 which is used to maintain the inlet pressure of T1 constant, and then enters HE3 for preheating. The heat stored in HFT1 will be supplied for HE3. After that, the CO2 expands through the turbine train to output electricity power. The outlet cryogenic CO2 from T2 provides cooling ability in HE4,PDF Image | Advanced Performance of a CO2 Energy Storage Based Trigen
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