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22 Thermodynamic cycle analysis case are lower than those of the regenerative Brayton system. Notice that also the variation of the temperatures is lower and do not exceed 805 ◦C. The most important difference with the regenerative Brayton system is that the pressure correspondent to the minimum TIT is much lower, 270 bar approximately. The CO2 mass flow, shown in Figure 2-16b, follows the expected trend. It decreases with larger pressure ratios since the specific work of the turbine increases. However, the vapor recompression system presents larger mass flow rates compared to the regenerative Brayton system since the turbine drives two compressors and only one operates close to the critical point. The mass flow therefore needs to increase in order to achieve the fixed target power of 18.7 MW. The regenerator power and effectiveness, presented in Figures 2-16c and 2-16d respectively, decrease in the case of the high temperature regenerator and increase for the low temperature regenerator. In the first case, this is due to the increasing pressure ratio which decreases the temperature difference between the cold and hot side extremes of the heat exchanger and decreasing both the power and the effectiveness (the same effect is present in the Brayton regenerative cycle). The opposite effect is present in the low temperature regenerator. The next sections present a similar analysis to the one of the regenerative Brayton system, i.e., the study of the influence of the components performance on the overall operation of the system. 2-3-1 Compressor suction temperature and discharge pressure effect Figure 2-17 shows the variation of the turbine inlet temperature and the regenerators load as a function of the compressor suction temperature and discharge pressure. Both charts present similar behavior to those correspondent to the regenerative Brayton system presented in Figure 2-4. Figure 2-17a shows the TIT, which is relatively constant for suction temperatures lower than the critical temperature. Figure 2-17b present the total regenerator load, which remains almost unchanged. These effects have already been discussed in section 2-2-1. 400 350 300 250 200 20 25 30 35 40 T2 [◦C] 400 350 300 250 200 20 25 30 35 40 T2 [◦C] (a) Contour lines of T4 (◦C). (b) Contour lines of Q ̇RG (MW). Figure 2-17: Turbine inlet temperature and total regenerators load for the Brayton recompression system as a function of the compressor suction temperature and discharge pressure (ηTR = 50%, P2 =74bar,ηTR =93.4%,ηCM1 =85%,ηCM2 =85%,ηHR =90%,∆PLS =2%,∆TPN =10◦C). J.S. Bahamonde Noriega Master of Science Thesis 50 740 800 840 860 880 860 900 880 50 80 55 55 P3 [bar] P3 [bar] 90 60 65 60 55 60 840 800 740 65 740 70 75 80 75 100 90 95 85 70 70 85 85 95 65 75 80 90 95 800PDF Image | Design method for s-CO2 gas turbine power plants
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