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2-4 Regenerative Rankine system 29 a feasible criteria to choose a particular set of operating conditions. The discharge pressure of the operational point for the vapor recompression system in Section 2-3-4 is chosen (272 bar). The results are presented in Figure 2-27. 900 800 700 600 500 400 300 200 100 0 −100 0.5 1 1.5 2 2.5 3 3.5 s [kJ/kgK] Cycle Pressure Density Enthalpy 4 5 3.5 6 3 2 Cycle points Pump inlet (2) Reg. cold side inlet (3) Heater inlet (3.5) Turb. inlet (4) Reg. hot side inlet (5) Cooler inlet (6) PT [bar] [◦ C] 19.70 -20.00 271.51 -5.94 271.51 270.24 266.08 818.73 20.10 471.03 20.10 4.60 Figure 2-27: Regenerative Rankine system T-s diagram (ηTR = 50%, T2 = −20◦C, , P3 = 271.51 bar, ηTR = 93.4%, ηPM = 85%, ηHR = 90%, ∆PLS = 2%, ∆TPN = 10◦C). The turbine inlet temperature is higher than that correspondent to the vapor recompression system. However, as indicated later, the regeneration load and CO2 mass flow is much lower. The regenerator temperature profile is presented in Figure 2-28. 500 400 300 200 100 0 −100 0 5 10 15 20 25 ∆ Q ̇ R G [ k W ] 6 3 Hot stream Cold stream 5 3.5 Figure 2-28: Regenerator temperature profile for the Regenerative Rankine system (ηTR = 50%, T2 = −20◦C, , P3 = 271.51 bar, ηTR = 93.4%, ηPM = 85%, ηHR = 90%, ∆PLS = 2%, ∆TPN = 10◦C). The pinch temperature is present at the cold extreme of the regeneration process and limits the performance of the heat exchanger. This is produced by the real gas effects that influence the properties of the streams. Besides, condensation takes place for the cold stream, which changes the heat capacity and slope of the temperature profile. The operating conditions of this specific case are presented in Table 2-5. Both the regenerator load and the CO2 mass flow are much lower than those correspondent to the regenerative and the vapor recompression Brayton systems. Regarding the aerospace Master of Science Thesis J.S. Bahamonde Noriega T [◦C] T [◦C]PDF Image | Design method for s-CO2 gas turbine power plants
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