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Thermodynamic analysis and optimization of a modified cascade refrigeration system using two-phase ejectors and low GWP fluids.

Author(s) : VEIGA DE SOUZA A., LOPES BARBIERI P. E., SILVA MOL D. C., NUNES DE OLIVEIRA R., NOGUEIRA DE FARIA R.

Type of article: IJR article

Summary

This study optimizes a two-phase ejector cascade refrigeration system using a Particle Swarm Optimization (PSO) algorithm for low-temperature applications. The constant area analysis method identifies ejector design parameters employing refrigerants with low global warming potential (GWP), such as NH3, R290, R1234yf, and R1234ze(E). The results indicate greater exergy destruction with the R1234yf – CO2 pair, while the NH3 – CO2 pair presented the highest optimized Coefficient of Performance (COP), reaching 1.81. It is observed that an increase in ejector nozzle diameters occurs as cooling capacity increases, and nozzle efficiency also influences the variation in ejector nozzle areas and the ideal area ratio. The research demonstrates the potential of cascade cooling systems with ejectors, providing additional insights into ejector performance to achieve greater efficiency and sustainability in low-temperature applications.

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Pages: 54-64

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Details

  • Original title: Thermodynamic analysis and optimization of a modified cascade refrigeration system using two-phase ejectors and low GWP fluids.
  • Record ID : 30032245
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 160
  • Publication date: 2024/04
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2024.02.003

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