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Energies 2020, 13, 2259 14 of 24 Energies 2020. 13. x FOR PEER REVIEW 14 of 26 Figure 7. Exergetic efficiency of the Brayton S-CO2-ORC components. Figure 7. Exergetic efficiency of the Brayton S-CO2-ORC components. For the operating conditions studied, the turbine 1 (T1) and the turbine (T2) are the components For the operating conditions studied, the turbine 1 (T1) and the turbine (T2) are the components that present the best behavior, presenting exergetic efficiencies of 98% in the three fluids used to that present the best behavior, presenting exergetic efficiencies of 98% in the three fluids used to analyze analyze this configuration. Therefore, they present minor irreversibilities and allow better use of the this configuration. Therefore, they present minor irreversibilities and allow better use of the energy in energy in the system. the system. 3.2. Exergy Destruction 3.2. Exergy Destruction To develop an exergy destruction analysis of the system, it was necessary to apply the exergy balance for each of the components as shown in Figure 8, where the exergy destruction fraction of To develop an exergy destruction analysis of the system, it was necessary to apply the exergy each component is evaluated at different inlet turbine temperature ranging from 550 °C to 800 °C. balance for each of the components as shown in Figure 8, where the exergy destruction fraction of For this analysis, the operational considerations in Section 3.1 have been taken to determine exergy each component is evaluated at different inlet turbine temperature ranging from 550 ◦C to 800 ◦C. destruction. The component with the minimum exergy destroyed is the pump (P2) compared to the For this anhaelaytseixsc,htahnegeorpcoemraptoinoenatsltchoatnhsaidvetrhaetigorenasteisnt eSxercgtyiodnes3tr.u1chtioanvienbtheeesnysttaemke.nThtuos,dtheeteITrmC2i,ne exergy which is the component with the greatest exergy destroyed with values ranging from 3.93 kW to 9.75 destruction. The component with the minimum exergy destroyed is the pump (P2) compared to the kW for the temperature range evaluated, showing a decrease between the value of exergy destroyed heat exchanger components that have the greatest exergy destruction in the system. Thus, the ITC2, from the base condition of 11% and an increase in exergy destroyed at the temperature of 800 °C of which is the component with the greatest exergy destroyed with values ranging from 3.93 kW to 9.75 3%. Although technological improvements do not translate into significant improvements in kWfortheetxermgeptiecreaftfuicirencrya,ntghieserevsaultucaatnedbe,simhopwrovinedgiafIdTeCc1reisadsesibgentewdeweinthtrhaetiovnalueeneorgfyexuseerganyddestroyed sustainability criteria, that leads to sensible improvements in how heat transfer is performed in this ◦ from the base condition of 11% and an increase in exergy destroyed at the temperature of 800 C of 3%. Although technological improvements do not translate into significant improvements in exergetic efficiency, this result can be improved if ITC1 is designed with rational energy use and sustainability type of exchanger, with the aim to obtain more compact, economical and efficient equipment. criteria, that leads to sensible improvements in how heat transfer is performed in this type of exchanger, with the aim to obtain more compact, economical and efficient equipment. The thermal oil pump (P1), and the organic fluid pump (P2) were the components that presented minimum exergy destruction. An alternative to having equipment with less exergy destruction would be to propose pumping systems with higher exergy efficiency, which would imply an increase in the net power produced by the cycle because the pump will consume less energy. However, the pump power is less than that produced by the turbine, which is the reason for the lower contribution of the exergy destroyed and the isentropic efficiency on the overall thermal cycle performance, as the contribution of these is almost indistinguishable when compared with the exergy destroyed from the other components of the cycle at the different inlet turbine temperatures.PDF Image | S-CO2 Brayton Cycle Coupled with ORC as Bottoming Cycle
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