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Performance investigation and precooler design of a coupled supercritical CO2-based mixture Brayton cycle with absorption refrigeration cycle

Author(s) : MA Y., HU P.

Type of article: IJR article

Summary

CO2–Kr (mass fraction of 0.755/0.245) has enormous development potential as a Brayton cycle working fluid. To reduce the limitation of ambient temperature on the supercritical CO2–Kr Brayton cycle, this paper develops a thermo-economic model of a coupled system of a supercritical recompression Brayton cycle (SRBC) and an absorption refrigeration cycle (ARC). The ARC utilizes the waste heat from the SRBC to further reduce the inlet temperature of the main compressor. The influences of ammonia–water ARC and LiBr–H2O ARC on the coupled system performance are analyzed and compared. The variations of the thermo-economic performance of the systems under different operating parameters are explored, and the impact of each variable on the cycle efficiency and cost is evaluated using a multiple regression linear method. From the perspective of predesign, mathematical models of precoolers with different systems are established. The results show that the coupled ARC improves the cycle efficiency of SCO2–Kr BRC by 9.76 %, reduces system cost by 27.01 % when ambient temperature is 25 °C, in addition, the heat loss and size of the precooler is greatly reduced. The inlet temperature and pressure ratio of the turbine are found to be the dominant parameters in determining the thermo-economic performance of the system.

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Pages: 234-244

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Details

  • Original title: Performance investigation and precooler design of a coupled supercritical CO2-based mixture Brayton cycle with absorption refrigeration cycle
  • Record ID : 30032344
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 162
  • Publication date: 2024/06
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2024.04.002

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