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2-2 Regenerative Brayton system 15 decreases with larger pressure ratios. Lower TITs decrease the regeneration temperature difference between cold and hot extremes and therefore result in a lower regenerator load. However, higher effectiveness values allow lower pinch temperatures and maintains almost constant the regeneration power, as shown in Figure 2-8b. The minimum effectiveness of 96% gives pinch temperatures between 20 and 40◦C at discharge pressures of 250 and 600 bar respectively. These temperature differences are quite large and therefore no lower values of effectiveness are considered. 2-2-4 Pressure loss effect The effect of the pressure drop is analyzed in this section by means of the calculation of the TIT as a function of the compressor discharge pressure and the pressure loss, as presented in Figure 2-9a. As shown in Section 2-2-1, larger pressure ratios decrease the TIT. Regarding the pressure losses, lager values lead to higher TIT and higher regeneration power due to the fact that it is necessary to increase both values to maintain the required thermal efficiency of 50%. 600 500 400 300 200 0 2 4 6 8 10 ∆PLS [%] 600 500 400 300 200 0 2 4 6 8 10 ∆PLS [%] (a) Contour lines of T4 (◦C). (b) Contour lines of Q ̇RG (MW). Figure 2-9: Turbine inlet temperature and regenerator load for the regenerative Brayton system as a function of the pressure loss and compressor discharge pressure (ηTR = 50%, T2 = 31.25◦C, P2 = 74 bar, ηTR = 93.4%, ηCM = 85%, ηHR = 90%, ∆TPN = 10◦C). 2-2-5 Operating conditions This section presents the analysis of a particular set of operating conditions. There are several criteria available for the optimal choice of this set. The compressor discharge pressure, turbine inlet temperature and system pressure loss are examples of available options. In this stage of the work the minimum TIT is chosen. As shown in Figure 2-3a, there is a specific discharge pressure that gives the minimum TIT for a fixed pressure loss. It is possible therefore to calculate these minimum TITs with their correspondent discharge pressures as a function of the pressure loss, as shown in Figure 2-10. Master of Science Thesis J.S. Bahamonde Noriega 40 950 1000 40 P3 [bar] P3 [bar] 1050 1000 60 950 1100 40 1050 1100 60 80 1000 1200 50 70 70 90 80 110 1150 1050 50 1350 60 80 90 100 110 100 120 1100 50 90 1150 1200 1250 1300 70PDF Image | Design method for s-CO2 gas turbine power plants
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