Comprehensive analysis of dual-heat-source Brayton cycle

In fusion reactors, dual-heat-source Brayton cycles are used to construct simple and efficient energy transfer systems to adapt to the two heat cycles in the reactor system. In solar-aided power generation, the dual-heat-source cycles focus on maximizing the use of clean energy, reduce CO₂ emissions and improve system efficiency. In this study, a comprehensive analysis framework incorporating 8 working fluids, 8 cycle configurations, and 18 heat-source operating conditions is developed. A total of 1,152 PSO calculations were conducted, resulting in 228 valid outcomes. Based on a comparative analysis of the optimal efficiency across different scenarios that is supported by enthalpy and exergy analyses, the characteristics of dual-heat-source Brayton cycles are examined comprehensively. Furthermore, a comprehensive performance comparison was conducted between the dual-heat-source Brayton cycle and independent Brayton and Rankine cycles to validate the relative advantages of the dual-heat-source Brayton cycle. In addition, simulations were conducted on low temperature heat source assisted power generation system such as solar. The results show that when the solar energy proportion is less than 35%, the efficiency exceeds 40%, with a maximum of 54%.