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Appl. Sci. 2020, 10, 8341 10 of 17 Table 5. Advanced exergy analysis results (kW). ... Component C1 C2 T1 T2 HE1 HE2 HE3 HE4 CS TV1 TV2 . ED,k 238.43 207.81 181.39 190.66 49.51 168.55 235.76 19.01 427.76 24.66 100.18 ED,k ED,k E. EN E. EX E. AV D,k D,k D,k 234.8 3.63 164.69 207.81 0 142.70 185.21 −3.82 124.95 196.32 −5.66 134.97 46.33 3.18 6.71 168.55 0 49.95 242.72 −6.96 8.85 12.91 6.1 4.85 362.32 65.44 300.21 24.66 0 11.69 100.18 0 0.00 E. UN D,k 73.73 65.11 56.44 55.69 42.80 118.60 226.91 14.17 127.55 12.97 100.18 ED,k E. AV D,k . AV,EN ED,k 177.01 160.38 132.00 139.85 6.61 68.61 43.59 −17.81 231.26 11.69 0.00 . AV,EX ED,k −12.32 −17.68 −7.05 −4.89 0.10 −18.66 −34.74 22.66 68.95 0.00 0.00 E. UN D,k . UN,EN ED,k 57.79 47.43 53.21 56.47 39.71 99.94 199.13 30.72 131.06 12.97 100.18 . UN,EX ED,k 15.95 17.68 3.23 −0.78 3.08 18.66 27.78 −16.55 −3.51 0.00 0.00 Table 6. Improvement priority of components. Conventional E. . AV D,k Advanced ED,k 10 TV1 HE4 11 HE4 TV2 Priority 1 2 3 4 5 6 7 HE2 TV1 8 TV2 HE3 9 HE1 HE1 CS CS C1 C1 HE3 C2 C2 T2 T2 T1 T1 HE2 3.2. Parametric Study Conducting a parametric study is of significance by varying a parameter alone at the fixed remaining values in order to evaluate the characteristics of the exergy destruction. Therefore, the efficiencies of compressors and turbines (η), pinch temperatures of heat exchangers and CS (∆τmin), pressure drop in TV2 (∆pTV2), storage pressure in HST (p7), compressor inlet pressure (p3) and ambient temperature (τamb) are examined individually. Figures 3–9 depict the impacts of the parameters on the results achieved from both conventional and advanced exergy analyses. 3.2.1. Effects of the Component Performance In this section the dependency of the examined parameters is investigated on each turbomachinery efficiency as the remaining parameters are retained the identical values as in Table 2 and for the real condition in Table 3. Since the effects of turbomachinery efficiency shares similar behavior, only the results from the examination of C1 and T1 efficiencies are illustrated in Figure 3 for simplicity and clarity. As seen in Figure 3a,c, an increase of C1 efficiency and T1 efficiency both lead to the decreasing .. ED,C1 and ED,tot, and the increasing εtot. The increase in εtot can be ascribed to a smaller power depletion coming from larger compressor efficiency and a higher power production because of larger turbine .. efficiency, respectively. A change of 0.01 in ηC1 alters ED,C1 and ED,tot by 37.58 kW and 38.30 kW, .. respectively, while the change of ED,T1 and ED,tot are separately 25.98 kW and 43.00 kW with the same change in ηT1. It is found that although the variation of the turbine exergy destruction is smaller than that in compressor, the turbine efficiency makes a higher influence on system exergy destruction.PDF Image | Advanced Performance of a CO2 Energy Storage Based Trigen
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