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Energetic and exergetic studies of modified CO2 transcritical refrigeration cycles
[Fundamental process and system design issues in CO2 vapor compression systems]

Author

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  • Omprakash S Patil
  • Shrikant A Shet
  • Manish Jadhao
  • Neeraj Agrawal

Abstract

Thermodynamic analysis including energetic and exergetic analysis is carried out employing Engineering Equation Solver for the five modified cycles: dual expansion cycle, internal heat exchanger cycle, work recovery cycle, work recovery with internal heat exchanger cycle and vortex tube expansion cycle. Contours are developed to study the effect of gas cooler temperatures and evaporator temperatures on the system performance and optimum gas cooler pressure. The modified cycle with work recovery turbine offers relatively higher COP and higher exergetic efficiency with lower compressor discharge pressure. The exergy loss in compressor, gas cooler, throttle valve and vortex tube (VT) are considerably higher than that in internal heat exchanger (IHX), evaporator and turbine. It is observed that COP of modified cycle with VT is slightly less than that with IHX, whereas the cycle with work recovery turbine brings the highest COP with the improvement of 25% at the gas cooler exit temperature of 305 K and evaporator temperature of 248 K.

Suggested Citation

  • Omprakash S Patil & Shrikant A Shet & Manish Jadhao & Neeraj Agrawal, 2021. "Energetic and exergetic studies of modified CO2 transcritical refrigeration cycles [Fundamental process and system design issues in CO2 vapor compression systems]," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 16(1), pages 171-180.
    • Handle: RePEc:oup:ijlctc:v:16:y:2021:i:1:p:171-180.
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    File URL: http://hdl.handle.net/10.1093/ijlct/ctaa042
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    Cited by:

    1. Hongzeng Ji & Jinchen Pei & Jingyang Cai & Chen Ding & Fen Guo & Yichun Wang, 2023. "Review of Recent Advances in Transcritical CO 2 Heat Pump and Refrigeration Cycles and Their Development in the Vehicle Field," Energies, MDPI, vol. 16(10), pages 1-21, May.

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    Keywords

    CO2; exergy; COP; transcritical;
    All these keywords.

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