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28 Thermodynamic cycle analysis As expected, the trends of the analyzed variables are similar to those of the regenerative Brayton configuration in Figure 2-3. However, the ranges of the variables for the s-CO2 Rankine system present better characteristics than those of the other configurations, i.e., lower TIT, lower CO2 mass flow, lower regeneration power and regenerator effectiveness always in the accepted range (≤ 98%). The minimum TIT of in Figure 2-25a has a value of 730◦C and it is present at a discharge pressure of 750 bar approximately, which is a extremely large operating pressure and therefore the criterion to choose the specific operating conditions based on the minimum TIT should be changed. The analysis of the operating conditions of the different components in the performance of the cycle is limited to the effect of the condensing temperature and the pump discharge pressure. 2-4-1 Condensing temperature and pump discharge pressure effect The variation of the TIT and the regenerators load as a function of the condensing temperature and discharge pressure is presented in Figure 2-26. The temperatures do not cross the critical point and therefore the Contour lines of T4 shown in 2-26a do not present sudden changes in their slope. Unlike both the regenerative and the vapor recompression Brayton systems, the suction temperature does have an influence on the TIT for the analyzed range in Figure 2-26a, i.e., lower suction temperatures decrease the TIT. Higher pressures decrease the TIT as well, which is a feature discussed in Section 2-2-1. Figure 2-26b presents the regeneration power. Both lower condensing temperature and higher discharge pressures reduce this power and are beneficial to decrease the size of the regenerators. 600 550 500 450 400 350 300 250 200 −40 −30 −20 −10 0 10 20 T2 [◦C] 600 550 500 450 400 350 300 250 200 −40 −30 −20 −10 0 10 20 T2 [◦C] (a) Contour lines of T4 (◦C) (b) Contour lines of Q ̇RG (MW) Figure 2-26: Turbine inlet temperature and regenerator load contour plot for the regenerative Rankine system as a function of the condensing temperature and pump discharge pressure (ηTR = 50%, ηTR = 93.4%, ηPM = 85%, ηHR = 90%, ∆PLS = 2%, ∆TPN = 10◦C). 2-4-2 Operating conditions As mentioned earlier, the minimum TIT for the Rankine system with a 2% pressure loss takes place at a very high pressure of 750 bar approximately. Therefore, the minimum TIT is not J.S. Bahamonde Noriega Master of Science Thesis 20 800 10 30 P3 [bar] P3 [bar] 700 850 750 20 800 30 40 850 900 950 800 50 750 20 900 1000 850 30 40 60 1050 950 1100PDF Image | Design method for s-CO2 gas turbine power plants
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