Özet:

The primary objective of this study is to investigate the solar-powered combined-cycles system in order to convert the available solar energy to its truest potential and generate electrical power. This combined-cycles system consists of solar power tower, steam turbine cycle, and organic Rankine cycle. The study focused on recovering the waste heat which is obtained from the exit of a steam turbine and uses it to operate the Rankine cycle by using the refrigerants, R-113, R-11, and R-1233zd. The analysis also predetermines the effects of solar irradiance for a mass flow rate of molten salt and steam, turbine inlet pressure, and turbine inlet temperature on first and second law efficiencies in the combined-cycles system. The novel concept of uncertainty analysis is also introduced in this work in order to provide accurate result with precision and removing all errors, which is found out to be 3.81 % that is in the desired range. The results also show that as the direct normal irradiation (DNI) increases from (600 W/m2 to 1000 W/m2), first law efficiency is obtained in the range of (32.31% to 37.99%) and second law from (24.14 % to 25.51 %) after employing the organic Rankine cycle (ORC) system. Further, the result indicates that maximum exergy destruction that occurs in the central receiver is around 42%, heliostat is 31%, the steam generator is 10%, a heat exchanger is 3.6%, etc.

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