Abstract
The variation performance of integrated solar combined cycle (ISCC) is presented using energy, conventional exergy and advanced exergy analysis methods to provide information about exergy destruction of components and efficiencies of overall plant. Moreover, the theory of dividing the exergy destruction of main components into unavoidable/avoidable and exogenous/endogenous parts allows for further understanding the real potentials for improving. Besides, the exergy destruction rate and exergy efficiency of components as well as overall plant were hourly analyzed within a typical day. Results indicate the exergy destruction rate of overall system drops from 49.79% to 44.65% in summer and decreases from 49.79% to 47.59% in winter. As the solar irradiation intensity rises, the solar field efficiency reaches to 42.16% in winter and 47.5% in summer. The solar-to-electric energy efficiency gets to 13.69% in winter and 15.46% in summer. In addition, with the increase of solar energy input to the ISCC system, the exergy destruction of Brayton cycle components decreases; however, the exergy destruction of Rankine cycle components increases. Furthermore, the exergy destruction of solar field has a large extended from 14.55 MW to 58.03 MW. Moreover, the heat recovery steam generator (HRSG) and the steam turbines have the largest exergy destruction rate of 11.26% and 13.63% at 15:00 p.m.
Highlights
Solar source is a kind of renewable energy and can be used for producing heat and electricity.It can supply 11.3% of worldwide electricity by the middle of the twenty-first century according to the International Energy Agency [1,2]
Saghafifar et al [14] investigated a kind of integrated solar combined cycle (ISCC) system and they showed that the hybrid solar field with conventional fossil fuel power plants had advantages in high solar irradiation intensity areas
Focused on the performance of ISCC applying direct steam generation (DSG) technology to parabolic trough collector (PTC), the results revealed that owing to the higher temperature, the conventional cycle power plant (CCPP) works worse; the ISCC plant performed better under the same conditions
Summary
Solar source is a kind of renewable energy and can be used for producing heat and electricity. Many researches have been applied to the technology of the integrated solar energy with CCPPs. Saghafifar et al [14] investigated a kind of ISCC system and they showed that the hybrid solar field with conventional fossil fuel power plants had advantages in high solar irradiation intensity areas. Açıkkalp et al [36] assessed another power facility via advanced thermodynamic analysis method They indicated that the components of combustion chamber, the high-pressure steam turbine and Energies 2018, 11, x FOR PEER REVIEW the condenser had high enhancement potentials. Another research by exergy exergy analysis methods, we are not aware of reported analysis of exergy destruction or Petrakopoulou [37] indicated that new improvement strategies are revealed with the advanced efficiency of components vary with solar time in ISCC system. System Description and Assumptions addition, the conclusions provide significant contribution on developing the existing processes
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