Abstract
The supercritical CO2 Brayton cycle integrated with a solar power tower system has the advantages of high efficiency, compact cycle structure, strong scalability, and great power generation potential, which can positively deal with the energy crisis and global warming. The selection and optimization of design points are very important for actual operating situations. In this paper, the thermodynamic and economic models of the 10 MWe supercritical CO2 Brayton cycle for application in solar power tower system are established. Multi-objective optimizations of the simple recuperative cycle, reheating cycle, and recompression cycle at different compressor inlet temperature are completed. The thermal efficiency and the levelized energy cost are selected as the fitness functions. The ranges of the optimal compressor inlet pressure and reheating pressure on the Pareto frontier are analyzed. Finally, multiobjective optimizations and analysis of the supercritical CO2 Brayton cycle at different ambient temperature are carried out. This paper investigates the influence of the compressor inlet temperature and ambient temperature on the thermal efficiency and economic performance of the supercritical CO2 Brayton cycle.
Highlights
The application of renewable energy is an important method to solve the energy crisis, deal with climate warming, and achieve sustainable development
The advantages of S-CO2 Brayton cycles in the Concentrated solar power (CSP) system are as follows [5]: less compression work is required; compact layout structure due to small turbomachinery and heat exchangers; droughty areas can be selected as application sites by dry cooling; less corrosiveness, fewer requirements for materials
He compared different S-CO2 Brayton cycle layouts integrated into the solar power tower (SPT) system based on multi-objective optimization, in which overall efficiency and specific work are selected performance criteria [7]
Summary
The application of renewable energy is an important method to solve the energy crisis, deal with climate warming, and achieve sustainable development. Wang et al [1] studied the influence of key parameters on thermal efficiency, specific work, and incorporation ability He compared different S-CO2 Brayton cycle layouts integrated into the SPT system based on multi-objective optimization, in which overall efficiency and specific work are selected performance criteria [7]. For the recompression S-CO2 Brayton cycle, Wang et al [2] investigated the effects of key parameters on the overall SPT system and cycle exergy efficiency. Few studies on the effects of compressor inlet temperature or ambient temperature on the multi-objective optimization comprehensively consider thermodynamic and economic performance. The parameters analysis of compressor inlet temperature and ambient temperature and multi-object optimization for the simple recuperative cycle, reheating cycle, and recompression cycle are investigated. The influence of variable compressor inlet temperature and ambient temperature on the Pareto frontiers are studied
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