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Appl. Sci. 2020, 10, 5049 5 of 22 literature review [4]. In a second step, turbine inlet temperature was set to 750 oC, based on several works in literature [18,19] and on private communications with Abengoa (a SCARABEUS partner), and the assessment of thermal performance was complemented by an economic analysis with the aim to calculate the capital cost of a representative CSP plant using each cycle layout [10]. The main specifications of this reference plant are presented in Table 2. Table 2. Specifications of the reference sCO2 power plant. Net Power Output Pmax,sCO2 TIT TEScapacity SM DNInom Tamb,nom [MWe] [MPa] [ oC] [hour] [-] [W/m2] [ oC] 50 30750102.485015 The thermo-economic performance of the reference power plant in Table 2 considering different cycle layouts is presented in Figure 2 for a pressure range deemed affordable in the medium term (15 to 40 MPa). Akin to the results provided in [8], ηth presents an increasing trend with pressure up 35 MPa. This is common to all cycles except the Recompression cycle (RC), in which the efficiency peaks a little sooner (30 MPa). On the other hand, the minimum Overnight Capital Cost is found between 30 and 35 MPa for all the cycles considered. Based on this, turbine inlet pressure is set to 30 MPa in the reference CSP plant, since this yields the best compromise between thermodynamic and economic performances and has already been proven to be achievable in similar power technologies such as ultra-supercritical steam turbines [20]. (a) Thermal efficiency. (b) OCC per kilowatt. Figure 2. Effect of maximum cycle pressure on thermal efficiency and Overnight Capital Cost per kilowatt. Legend: Simple Recuperated (SR), Transcritical (TC), Partial Cooling (PC), Recompression (R), Pre-compression (PrC) and Allam (Al). Data adapted from [10]. 2.2. Economic Assessment The calculations presented in Figure 2b above account for uncertainty regarding the capital costs of components. Using a Montecarlo analysis, each component cost is assigned a probabilityPDF Image | Supercritical CO2 Power Solar Power Plants
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