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Appl. Sci. 2020, 10, 8341 14 of 17 . . EN increases firstly and then decreases monotonically corresponding to ED,tot. The tendencies of ED,tot, . AV . AV,EN . ED,tot and ED,tot are similar with ED,tot. Figure 8. Effects of compressor inlet pressure: (a) conventional exergy analysis results; (b) advanced exergy analysis results. Figure 9 presents the impact of ambient temperature (τamb) on system exergy destructions and exergy efficiency. It is observed that with an increase in ambient temperature, the system exergy . destruction ED,tot decreases firstly with sensitivity of 10.19 kW per Celsius degree and then increases monotonically with sensitivity of 13.78 kW per Celsius degree. The exergy destruction of heat exchangers is decreased with a higher ambient temperature, while the exergy destruction of CS shows a reverse trend. Moreover, with a larger ambient temperature, the change extent of exergy destruction within CS becomes larger than that within heat exchangers. Therefore, the refraction occurs in the figure. Simultaneously, the system exergy efficiency εtot increases firstly and then decreases monotonically . .EN.AV .AV,EN . corresponding to ED,tot. Tendencies of ED,tot, ED,tot, and ED,tot are similar with ED,tot. Figure 9. Effects of ambient temperature: (a) conventional exergy analysis results; (b) advanced exergy analysis results. 4. Conclusions In this paper, exergy analysis based on both the conventional and advanced technology is utilized to a novel CCHP system based on TC-CCES. Some important conclusions are drawn as follows. (1) Based on the results obtained from conventional exergy analysis, the biggest exergy destruction exists in cold storage, followed by compressor 1 and heat exchanger 3. Heat exchanger with supercritical working fluid produces much more irreversible loss than that with gaseous working fluid. The system keeps an overall exergy efficiency of 56.25%. (2) More interesting features can be obtained from advanced exergy analysis. Dividing exergy destruction into exogenous /endogenous parts clarifies that the component interactions in the system are not very sound but rather complex. Dividing exergy destruction into avoidable/unavoidable partsPDF Image | Advanced Performance of a CO2 Energy Storage Based Trigen
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