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Appl. Sci. 2020, 10, 8341 9 of 17 much more irreversible loss than HE1 and HE4 (y∗HE1 = 2.69%, y∗HE4 = 1.03%) within gaseous state. The logical explanation behind this phenomenon can be given in two aspects. The mass flow of cooling water is larger for supercritical CO2 owning to its higher specific heat. Moreover, the properties of supercritical CO2 are more sensitive to temperature, and thus a larger temperature difference will occur to guarantee the set pinch temperature. For instance, the upper terminal temperature difference . of HE1 and HE2 are 5 K and 34.15 K, respectively. From the system point, the total fuel exergy EF,tot . originates from the power supplied to compressors, and EP,tot is the summation of the power produced in turbines and the heating and cooling exergy. The overall system has an exergy efficiency of 56.25%, and therefore 43.20% of the system fuel exergy is destroyed. Component C1 C2 T1 T2 HE1 HE2 HE3 HE4 CS TV1 TV2 Overall system Table 4. Conventional exergy analysis results. E. (kW) E. (kW) E. (kW) E. (kW) ε y y* F,k P,k D,k L k k k 2178.20 2091.40 1282.52 1169.12 389.516 1183.48 994.18 77.99 2154.99 456.97 4589.13 4269.6 1939.77 238.43 - 1883.59 207.81 - 1101.13 181.39 - 978.46 190.66 - 340.01 49.51 - 1014.93 168.55 - 758.42 235.76 - 58.98 19.01 - 1727.23 427.76 - 432.31 24.66 - 4488.95 100.18 - 2401.65 1843.72 24.23 89.05 5.58 90.06 4.87 85.86 4.25 9.84 83.69 4.47 87.29 1.16 2.69 85.76 3.95 9.14 76.29 5.52 75.63 0.45 1.03 56.25 43.20 80.15 10.02 94.60 0.58 1.34 97.82 2.35 5.43 12.93 11.27 10.34 12.79 23.20 100.00 Using the approach aforesaid, all detailed exergy parts are shown in Table 5. One can notice that the endogenous part is much larger than the exogenous part, implying that the exergy destruction within each component is mainly induced by its own irreversibility. The exogenous part is zero for C2, HE2 and all throttle valves, indicating that for these components the exergy destructions are introduced only by their endogenous irreversibility. The negative exogenous exergy destructions within turbines and HE3 mean that enhancing the irreversible loss in other system components lessens the exergy destruction within these components. It is concluded that the communications of components in the CCHP system based on TC-CCES are not strong but rather complex. One can also see in Table 5 that only turbomachineries and CS possess higher avoidable part than unavoidable part and therefore 48.5% of the system exergy destruction cannot be eliminated in the studied condition. . AV The CS exists the largest magnitude of avoidable part (ED,CS = 300.21 kW), followed by compressors . AV,EN . AV,EX and turbines. In addition, the reader should concentrate mainly on ED,k and ED,k . It is observed . AV,EN . AV,EX that all the components except of HE4 and TV2 have larger ED,k than ED,k , which demonstrates that the elimination of energy losses in the system depends mainly on improving the performance of . AV,EN components themselves. Very readable foundation is shown by concentrating on ED,HE4 . The data . AV,EN . of ED,HE4 is negative, which clears that ED,HE4 can be lessened by raising the magnitude of its pinch temperature which results in a decline of the liquid carrying capacity at the outlet of T2. Table 6 lists the promotion priority of all the components in the presented CCHP system based on TC-CCES determined by different analysis methods. It can be observed that high diverse happens between conventional and advanced priorities because of different criteria. For an instance, the HE3 is considered the third priority in conventional exergy analysis. However, it is the eighth component for optimization in the advanced method. In short, the advanced exergy method offers much more trustworthy results since both technological limitations of each component and the interconnections among components are considered.PDF Image | Advanced Performance of a CO2 Energy Storage Based Trigen
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