Abstract
This communication proposed a solar driven system based on supercritical CO2 (sCO2) power cycle integrated with cascaded refrigeration cycle (CRC) to refrigerate a thermal load of below than -40°C. The impact of varying solar irradiance (DNI), type of solar heat transfer fluid (SHTF), and the working fluid of CRC on refrigeration capacity and exergy efficiency of combined system are investigated. Results indicate helium as the most efficient SHTF with air to follow. It is shown that maximum refrigeration is produced when operating with helium as SHTF and propylene as the refrigerant for CRC. From exergetic point of view, propylene provides higher exergy efficiency; CO2 is the one with lower, while N2O presents intermediate results. The exergy efficiency of the system for the propylene, N2O and CO2 is determined as 9.64%, 8.73%, and 8.47%, respectively.
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