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Supercritical CO2 Power Solar Power Plants

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Appl. Sci. 2020, 10, 5049 7 of 22 configurations to the Allam and Partial Cooling cycles, the layouts of which are presented in Figure 4. The main features of these cycles are: • Allam cycle: it is an extremely high recuperative cycle, an evolution of a standard Brayton cycle incorporating a three-step compression process with two compressors and a pump separated by an intercooler and a condenser respectively. Originally proposed by Allam [24] for oxy-combustion applications, this layout has been adapted considering pure sCO2 as working fluid [8]. • Partial Cooling cycles: this cycle derives directly from Angelino’s work [6], and it is an evolution of a Recompression cycle with the addition of a cooler and a pre-compressor before the flow-split. The most interesting features of the Partial Cooling cycle are its high specific work [25] and a very low sensitivity of global efficiency to deviations of pressure ratio from the optimum value [26]. The installation costs reported in Table 3 are presented graphically in Figure 3, showing that the high temperature heat exchanger (heat adder or heater) is the key contributor to installation costs, accounting for approximately half of the total OCC of the power block. This is due to the very high operating pressure and temperature of the sCO2-FLiNaK heat exchanger which, as a consequence, requires the utilisation of special alloys like Inconel 617 [10]. Figure 3. Breakdown of the Overnight Capital Cost of the power block. (a) Allam. (b) Partial Cooling. Figure 4. Layouts of the Allam and Partial Cooling cycles.

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