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Appl. Sci. 2020, 10, 8341 13 of 17 .. and system (ED,TV2 and ED,tot) with sensitivities of 27.05 kW and 71.24 kW per MPa, respectively. The decreasing system exergy efficiency εtot originates in the decline of the turbine inlet pressure. . EN . The variation tendency of the endogenous exergy destruction in overall system ED,tot is similar to ED,tot . . EN since very most of ED,tot comes from ED,tot. Moreover, the system avoidable exergy destruction is almost the same as the avoidable endogenous part, both decreasing slowly and then increasing gradually. Figure 6. Effects of pressure drop in throttle valve 2: (a) conventional exergy analysis results; (b) advanced exergy analysis results. The storage pressure in HST p7 has a significance role in determining the power consumed in compressor and the power produced in turbine. Figure 7 illustrates the variation of system exergy destructions and exergy efficiency by varying the storage pressure. A rise in storage pressure produces . a decline in overall system exergy destruction ED,tot with sensitivity of 75.10 kW per MPa, and thus . the decreasing ED,tot causes an increase in system total exergy efficiency εtot. Therefore, the system . EN . AV . AV,EN endogenous part ED,tot, avoidable part ED,tot, and avoidable endogenous part ED,tot all decrease with storage pressure. Figure 7. Effects of storage pressure: (a) conventional exergy analysis results; (b) advanced exergy analysis results. Figure 8 describes the variation of system exergy destructions and exergy efficiency by changing the compressor inlet pressure (p3). It is observed that with an increase in compressor inlet pressure, . the system exergy destruction ED,tot decreases firstly with sensitivity of 21.26 kW per 0.1 MPa and then increases monotonically with sensitivity of 19.95 kW per 0.1 MPa. This phenomenon can be explained below. With a higher compressor inlet pressure, the exergy destruction of CS is decreased, and the changing extent becomes smaller with the increasing compressor inlet pressure, while the exergy destruction of compressors, heat exchangers and TV2 shows a larger increase. Therefore, the system exergy destruction decreases firstly and then increase. Moreover, the system exergy efficiency εtotPDF Image | Advanced Performance of a CO2 Energy Storage Based Trigen
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