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14 Thermodynamic cycle analysis the compressor efficiency, which indicates that the performance of the compressor has a low impact in the operation of the system compared with the performance of the turbine. Compressor Turbine −0.3 −0.4 −0.5 −0.6 −0.7 −0.8 −0.9 −1 75 80 85 90 95 100 ηCM, ηTR [%] Figure 2-7: Sensitivity of the turbine and compressor efficiency in the regenerative Brayton system (ηCM0 =70%,ηTR0 =70%,ηTR =50%,T2 =31.25◦C,P2 =74bar,P3 =300bar,ηHR =90%, ∆PLS = 2%, ∆TPN = 10◦C). 2-2-3 Regenerator effectiveness effect This section documents the calculation of the turbine inlet temperature and the regenerator load as a function of the discharge pressure and regenerator effectiveness. The results are shown in Figure 2-8. 600 550 500 450 400 350 300 250 96 97 98 99 100 εRG [%] 600 550 500 450 400 350 300 250 96 97 98 99 100 εRG [%] (a) Contour lines of T4 (◦C). (b) Contour lines of Q ̇RG (MW). Figure 2-8: Turbine inlet temperature and regenerator load for the regenerative Brayton system as a function of the regenerator effectiveness and compressor discharge pressure (ηTR = 50%, T2 = 31.25◦C, P2 = 74 bar, ηTR = 93.4%, ηCM = 85%, ηHR = 90%, ∆PLS = 2%). The effect of the discharge pressure is discussed in Section 2-2-1. Regarding the influence of the regenerator effectiveness, higher values improve the thermal energy recovery and therefore decrease the TIT, as shown in Figure 2-8a. Notice that the influence of the effectiveness J.S. Bahamonde Noriega Master of Science Thesis 950 900 1000 950 P3 [bar] P3 [bar] ζCM, ζTR [–] 1000 1050 950 1050 1100 1000 1150 1200 40 40 40 50 50 50 60 60 60 70 70 70 80PDF Image | Design method for s-CO2 gas turbine power plants
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