This work discusses a preliminary thermodynamic assessment of three different supercritical CO2(sCO2) power cycles applied to a high temperature solar tower system, with maximum temperatures up to 800 Â°C. The thermal power is transferred from the solar receiver to the power block through KCl-MgCl2molten salts as heat transfer fluid, therefore an indirect cycle configuration is considered assuming a surrounded field as the one of Gemasolar plant. The most promising cycle configuration in terms of solar-to-electric efficiency is selected, optimizing the cycle turbine inlet temperature to achieve the best compromise between cycle and receiver performance: the highest efficiency at design conditions is achieved by the Recompression with Main Compression Intercooling (RMCI) configuration with a solar to electric efficiency of 24.5% and a maximum temperature of 750 Â°C. The yearly energy yield of the proposed power plant is estimated with a simplified approach and results in the range of 18.4%: the performance decay from design to average yearly conditions is mostly due to the optical and thermal efficiencies reduction (â10.8% and â16.4%, respectively).
|Titolo:||Preliminary assessment of sCO2cycles for power generation in CSP solar tower plants|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||01.1 Articolo in Rivista|
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|1-s2.0-S0306261917306268-main(3).pdf||Publisher’s version||Accesso riservato|