Abstract
ABSTRACTIntegrated Solar Combined-Cycle (ISCC) technology combines the benefits of solarenergy with the benefits of a combined cycle. The solar resource partially substitutesthe fossil fuel. In this paper, a thermodynamic exergy analysis of the integrated solarcombined cycle power plant in Egypt was implemented. The data is taken from thedesign documentations of the plant as well as the plant records. Exergy-basedperformance analysis based on the second law of thermodynamics overcomes thelimit of studying the system based on the first law of thermodynamics. It assesses themagnitude of exergy destruction in each part of the system. The plant is a 135 MWehybrid power plant composed of a combined cycle and a 20 MWe solar thermal plant.Exergy destruction throughout the plant is quantified and illustrated using an exergyflow diagram. The exergitic efficiency of each component of the ISCC is calculated.The results showed that the overall thermal efficiency and the 2nd law efficiency of theISCC accounted for 32% and 40.8%, respectively. Also, it was revealed that thecombustion chamber and the solar field represent the sites of the highest exergydestruction in the ISCC (34 % and 42.1% respectively). The sources of the exergydestruction in the combustion chamber and the solar field are discussed in order toidentify the possibility to enhance the performance of the components of majorexergy destruction.
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