Power Optimization of a Modified Closed Binary Brayton Cycle with Two Isothermal Heating Processes and Coupled to Variable-Temperature Reservoirs

Chenqi Tang, Lingen Chen, Huijun Feng, Wenhua Wang and Yanlin Ge
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Chenqi Tang: Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, China
Lingen Chen: Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, China
Huijun Feng: Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, China
Wenhua Wang: College of Power Engineering, Naval University of Engineering, Wuhan 430033, China
Yanlin Ge: Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, China

Energies, 2020, vol. 13, issue 12, 1-21

Abstract: A modified closed binary Brayton cycle model with variable isothermal pressure drop ratios is established by using finite time thermodynamics in this paper. A topping cycle, a bottoming cycle, two isothermal heating processes and variable-temperature reservoirs are included in the new model. The topping cycle is composed of a compressor, a regular combustion chamber, a converging combustion chamber, a turbine and a precooler. The bottoming cycle is composed of a compressor, an ordinary regenerator, an isothermal regenerator, a turbine and a precooler. The heat conductance distributions among the six heat exchangers are optimized with dimensionless power output as optimization objective. The results show that the double maximum dimensionless power output increases first and then tends to be unchanged while the inlet temperature ratios of the regular combustion chamber and the converging combustion chamber increase. There also exist optimal thermal capacitance rate matchings among the working fluid and heat reservoirs, leading to the optimal maximum dimensionless power output.

Keywords: finite time thermodynamics; modified binary Brayton cycle power plant; power output; energy saving; heat exchanger optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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