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Appl. Sci. 2020, 10, 8341 11 of 17 This can be explained that the CCHP system based on TC-CCES is a closed loop thermodynamic cycle, and thus the outlet thermodynamic state from turbine will influence the power consumed in compressor. More detailed and fascinating features are identified in Figure 3b,d, which indicates that the increase in turbomachinery efficiency causes a relatively large decline in the endogenous part, avoidable part, and avoidable endogenous part of exergy destruction. Moreover, the avoidable exogenous part keeps almost the same constant versus efficiency. The results demonstrate that the exergy destructions in compressor and turbine can be decreased mainly by promoting the same component itself. In a word, larger turbomachinery efficiency favors reducing the exergy destruction. Figure 3. Effects of turbomachinery efficiency: (a) conventional and (b) advanced exergy analysis results versus compressor 1 efficiency; (c) conventional and (d) advanced exergy analysis results versus turbine 1 efficiency. Figure 4 depicts the influence of pinch temperature in CS (∆τmin,CS) on exergy analysis results. It is observed in Figure 4a that an increase of ∆τmin,CS results in a relatively large rise of the CS exergy .. destruction ED,CS and the exergy destruction in overall system ED,tot, and therefore a decline of total exergy efficiency ε . A 1 ◦C degree increment of ∆τ will increase E. and E. by 58.99 kW tot min,CS D,CS D,tot and 74.49 kW respectively, leading to a quite large potential for improvement. As can be seen in . EN . AV Figure 4b, one can notice that tendencies depicted for the split parts of exergy destruction ED,CS, ED,CS, E. AV,EN and E. AV,EX are similar, all increasing monotonically with ∆τ . Moreover, the E. AV,EN is D,CS D,CS min,CS larger than E. AV,EX, and the difference becomes larger with the increase of ∆τ D,CS since the increasing min,CS trend of the former part is sharper than the latter one. This make it clear that a reduction of ED,CS is of more dependence on improving the performance of CS itself. In short, a smaller ∆τmin,CS favors the D,CS . system performance for decreasing the exergy destruction and enhancing system exergy efficiency. Figure 5 shows the variation of exergy destructions and εtot by changing the pinch temperature in HE2 and HE3. The results of exergy analyses for HE1 and HE4 are not given in this section since the values of their exergy destruction rate are rather small. It is pointed out that analyzing the componentPDF Image | Advanced Performance of a CO2 Energy Storage Based Trigen
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