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2-2 Regenerative Brayton system 13 avoided. Therefore, the compressor suction temperature of 31.25◦C is a convenient value and it is taken for the analysis next sections. 2-2-2 Turbine and compressor efficiency effect This section presents the analysis of analyzes the effects of the turbine and compressor ef- ficiencies on the system performance. A chart showing the variation of the turbine inlet temperature and regenerator load as a function of these two variables is presented in Figure 2-6. 100 95 90 85 80 75 70 70 75 80 85 90 95 100 ηCM [%] 100 95 90 85 80 75 70 70 75 80 85 90 95 100 ηCM [%] (a) Contour lines of T4 (◦C). (b) Contour lines of Q ̇RG (MW). Figure 2-6: Turbine inlet temperature and regenerator load for the regenerative Brayton system as a function of the turbine and compressor adiabatic efficiencies (ηTR = 50%, T2 = 31.25◦C, P2 = 74 bar, P3 = 300 bar, ηHR = 90%, ∆PLS = 2%, ∆TPN = 10◦C). Figure 2-6a presents the turbine inlet temperature as a function of the turbine and com- pressor efficiencies and it shows that the turbine efficiency has more influence on the system performance than the compressor efficiency, as expected. This is a consequence of the small power of the compressor when it is compared with that of the turbine. This feature is an advantage of the s-CO2 power systems that was already mentioned in the first works of Fe- her [1]. It is produced by the high densities of the CO2 in the critical region that reduce both the compressor work and its influence on the overall performance of the cycle. A sensitiv- ity analysis is done on the compressor and turbine efficiencies to quantify the effect of both parameters. Sensitivity refers to the effect that one variable has on another variable. The output analyzed here is the turbine inlet temperature. If the compressor efficiency changes from an initial value ηCM0 to a value ηCM0 + ∆ηCM, also the TIT changes from an initial value of TTIT0 to a value TTIT0 + ∆TTIT. The sensitivity is given by the ratio of the relative changes of this variables [48], ζ = ∆TTIT/TTIT0 . (2-5) ∆ηCM /ηCM0 The same principle applies for the turbine sensitivity analysis. The results of this calculation are shown in Figure 2-7. The starting efficiency for both compressor and turbine has been considered as 70%. The sensitivity of the turbine efficiency is more than twice the one of Master of Science Thesis J.S. Bahamonde Noriega 1000 1100 ηTR [%] ηTR [%] 1000 1100 1200 1300 1100 1200 60 70 80 90 1200 1300 1000 1400 100 60 100 60 70 1300 70 1400 900 80 90 100 110 80 90PDF Image | Design method for s-CO2 gas turbine power plants
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