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aimed at the reduction of inefficiencies in these systems. The acetone presented the best average behavior among the fluids in the temperature range studied, concerning toluene and cyclohexane, with a difference of 2.9% and 2.7%, respectively, which is a consequence of the thermal properties of this fluid. However, before implementing these results at the industrial level, advanced economic analyses and exertion of these systems must be carried out [35], in addition to thermo-economic Energies 2020, 13, 2259 12 of 24 studies to determine the technical and economic feasibility of this solution [36]. FiFgiugruer5e.5S.ySsytsetmempepreforfromrmanacnecepaprarmametetresrswwithithrersepsepcetctotoTITI,T(,a()an)enteptopwowere;r(;b()bt)htehremrmalaelffiefcfiecniecnycy BrBaryatyotno-nO-ORCR;C;(c()c)aabbsosoluluteteininccrreeaassee iin thermal efffificiency;; (d(d))exeexregrgyyefefifficiceinecnycyBrBaryatyotno-nO-ROCR;C(;e) (e)bbrarkake-es-pspeceicfificcfufuelelcoconnsusummpptitoionn;;(f()f)aabbsosoluluteteddeecrcereaaseseininbbrarakkee-s-sppeeccifiificcfufueellccoonnssuumpptitoionn.. In the case of the thermal efficiency of the Brayton S-CO -ORC integrated system, as shown in Thehighturbinepressureinthesystemisanotherrelev2antoperationalparameterthatimpacts Figure 5b, acetone is the fluid with the best thermal performance in the operation of the configurations, on the energy and exergy efficiency of the integrated system; however, this variable has less impact this is because its thermo-physical properties benefit the best use of energy and the performance of the than the main turbine inlet temperature (T1), producing less variability in the performance system components, reaching a maximum thermal efficiency of 50.44% at 800 ◦C, this being the best parameters, as can be seen in Figure 6. For the performance of the net power, it presents less efficiency operating condition of this fluid. Therefore, each fluid presents its particular operating conditions that in its behavior concerning the performance affected by the inlet temperature (Figure 5a), presenting must be studied to optimize the energetic, exergetic, and environmental performance of each proposed an approximate increase of 36% beside 9% of the energy generated by the system. alternative [33,34]. On the other hand, Figure 6e shows the decrease in the specific fuel consumption for the three Figure 5d shows the total exergetic efficiency of the system studied, where the turbine T1 inlet fluids studied in the integrated configuration of the Brayton S-CO2-ORC system, with acetone temperature has a positive influence on all the organic working fluids studied. Toluene and cyclohexane showing the best performance of the three fluids due to its better specific consumption reduction. exhibited similar behavior. However, acetone exceeds an exergetic efficiency of 71.4% at a turbine inlet This result is closed near the other parameter calculated. This result implies a significant reduction temperature of 800 ◦C. Through the analysis of this parameter, it contributes to the objective of making in the system operating costs. It allows better use of resources, improving its performance between more effective use of the nonrenewable energy resource used in the Brayton cycle by establishing the the energy input and the power produced at high temperatures. components, modes, and actual amounts of exergy destruction and loss in the integrated system. The values obtained for exergetic efficiency are of great importance in this study since they allow for the design of a more effective integrated Brayton S-CO2-ORC configuration, aimed at the reduction of inefficiencies in these systems. The acetone presented the best average behavior among the fluids in the temperature range studied, concerning toluene and cyclohexane, with a difference of 2.9% and 2.7%, respectively, which is a consequence of the thermal properties of this fluid. However, before implementing these results at the industrial level, advanced economic analyses and exertion of these systems must be carried out [35], in addition to thermo-economic studies to determine the technical and economic feasibility of this solution [36].PDF Image | S-CO2 Brayton Cycle Coupled with ORC as Bottoming Cycle
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