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June 12, 2026Results in EngineeringOpen Access

Energy, Exergy, and Environmental (3E) analysis of transcritical CO2 refrigeration cycle with an expander, an internal heat exchanger, and a mechanical sub-cooler

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Authors

RSRamesh P. SahAMAshes MajiMSMandar S. Sapre

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Overview

Randomized trial investigates energy and environmental performance in transcritical CO2 refrigeration cycles, suggesting improved efficiency with an expander.

Key Points

  • The study aims to analyze the energy, exergy, and environmental performances of a transcritical CO2 refrigeration cycle.
  • Developed a mathematical model in MATLAB interfaced with REFPROP for refrigerant properties.
  • Conducted a parametric study evaluating effects on coefficient of performance (COP) and exergy efficiency across various configurations.
  • Performed TEWI analysis comparing cycles with and without an expander, internal heat exchanger, and mechanical sub-cooler.
  • Cycle with expander achieves highest COP of 3.21, a 32.83% increase over the basic cycle, with exergy efficiency of 22.7%.
  • IHX cycle exhibits maximum exergy destruction with highest irreversibility in the gas cooler.
  • Expander cycle reduces annual CO2 emissions by 23.74% compared to the basic cycle.

Cite This Study

Sah et al. (2026) studied this question.

synapsesocial.com/papers/6a2ba1ca8101cf8926f0110ahttps://doi.org/10.1016/j.rineng.2026.111477
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