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Energies 2020, 13, 2259 13 of 24 The high turbine pressure in the system is another relevant operational parameter that impacts on the energy and exergy efficiency of the integrated system; however, this variable has less impact than the main turbine inlet temperature (T1), producing less variability in the performance parameters, as can be seen in Figure 6. For the performance of the net power, it presents less efficiency in its behavior concerning the performance affected by the inlet temperature (Figure 5a), presenting an approximate Energies 2020. 13. x FOR PEER REVIEW 13 of 26 increase of 36% beside 9% of the energy generated by the system. FigFuigruere6.6.SystemppeerfroformrmaanncecepaprarmametetresrwsiwthitrhesprescptetoctPtHoIGHP,,(a)n,e(tap)onweterp;(obw)ethr;er(mb)altehfefircmieanlcy HIGH effiBcriaeyntcoynB-OraRyCto;n(-cO)RaCbs;o(clu)taebsionlcurteeaisnecrineastheeinrmthaelremffailcieffincyie;n(cdy); (edx)eergxeyrgeyffiecffiiecniceyncByrBaryatyotno-nO-ROCR;C(;e) (e)bbrarakkee-s-sppeeccifiificcfufueellccoonnssuumpptitoionn;;(f(f))aabbssooluluteteddeeccrreeaasseeininbbrraakkee--sspeecciiffiiccffueellcconssumpttiion.. On the other hand, Figure 6e shows the decrease in the specific fuel consumption for the three The exergetic efficiency behavior for each component of the system under the three organic fluids studied in the integrated configuration of the Brayton S-CO -ORC system, with acetone showing working fluids is shown in Figure 7. From the results. The low2er exergy efficiency is presented in the the best performance of the three fluids due to its better specific consumption reduction. This result is thermal oil pump (P1), with a 10.98% (Toluene) and 11.06% (Cyclohexane), while the efficiency in the closed near the other parameter calculated. This result implies a significant reduction in the system organic fluid pump (P2) was 77.6% for the three fluids. These results are because of the higher- operating costs. It allows better use of resources, improving its performance between the energy input pressure ratios required to pump the thermal oil, which implies higher irreversibilities for heat and the power produced at high temperatures. transfer in this component. Thus, a thermo-hydraulic design should be proposed for both the The exergetic efficiency behavior for each component of the system under the three organic evaporator (ITC2) and the shell and tube heat exchanger (ITC1) with the lowest pressure drop, and working fluids is shown in Figure 7. From the results. The lower exergy efficiency is presented in the highest heat transfer. thermal oil pump (P1), with a 10.98% (Toluene) and 11.06% (Cyclohexane), while the efficiency in the organic fluid pump (P2) was 77.6% for the three fluids. These results are because of the higher-pressure ratios required to pump the thermal oil, which implies higher irreversibilities for heat transfer in this component. Thus, a thermo-hydraulic design should be proposed for both the evaporator (ITC2) and the shell and tube heat exchanger (ITC1) with the lowest pressure drop, and highest heat transfer.PDF Image | S-CO2 Brayton Cycle Coupled with ORC as Bottoming Cycle
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