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2-4 Regenerative Rankine system 27 2-4 Regenerative Rankine system This section presents the analysis of the re- generative Rankine system, whose process flow diagram is presented in Figure 2-24. In order to perform the thermodynamic analy- sis, it is necessary to define the s-CO2 con- densing temperature. Its value is chosen re- ferring to the first study case of Chapter 4, in which the feasibility of s-CO2 systems for aerospace applications is investigated. Be- cause of the very low environmental temper- atures present at cruise altitude (-50◦C at 10670 m [51]), the condensing temperature is set to -20 ◦C (19.70 bar condensing pres- sure). The system is analyzed with the same parameters used in the other configurations with a pump efficiency of 85%. The results are presented in Figure 2-25. Figure 2-24: Process flow diagram for the regenera- tive Rankine system. 900 850 800 750 700 200 300 400 500 600 700 800 P3 [bar] 49 48 47 46 45 44 200 300 400 500 600 700 800 P3 [bar] (a) Turbine inlet temperature. (b) CO2 mass flow. 98.5 98 97.5 97 96.5 96 200 300 400 500 600 700 800 P3 [bar] 30 25 20 15 10 200 300 400 500 600 700 800 P3 [bar] (c) Regenerator power. (d) Regenerator effectiveness. Figure 2-25: Turbine inlet temperature, CO2 mass flow rate, regenerator power and effectiveness for the regenerative Rankine system (ηTR = 50%, T2 = −20◦C, ηTR = 93.4%, ηPM = 85%, ηHR = 90%, ∆PLS = 2%, ∆TPN = 10◦C). Master of Science Thesis J.S. Bahamonde Noriega Q ̇RG [MW] T4 [◦C] εRG [%] f [kg/s]PDF Image | Design method for s-CO2 gas turbine power plants
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