Abstract
The present study investigates the performance of a combined power cycle used for solar tower (central receiver) plant. The combined cycle employs a supercritical carbon dioxide (S-CO2) Brayton cycle as a topping cycle cascaded by an organic Rankine cycle (ORC). In order to evaluate the system performance, a thermodynamic analysis is conducted through energy and exergy approaches for each subsystem and hence evaluation of its overall energy and exergy efficiencies. Furthermore, the energy and exergy efficiencies of the integrated system are parametrically studied under different operating conditions. The benefits of using CO2 as a working fluid in a Brayton cycle are elaborated in the context of high-temperature solar tower technologies. The opportunity of recovering the topping cycle low-grade heat is investigated, through the proposal of utilising an n-butane ORC as a bottoming cycle.
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