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Modelling and Evaluation of the Thermohydraulic Performance of Finned-Tube Supercritical Carbon Dioxide Gas Coolers

Author

Listed:
  • Lei Chai

    (RCUK Centre for Sustainable Energy Use in Food Chains (CSEF), Institute of Energy Futures, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK)

  • Konstantinos M. Tsamos

    (Hubbard Products Ltd, Ipswich IP3 9RR, UK)

  • Savvas A. Tassou

    (RCUK Centre for Sustainable Energy Use in Food Chains (CSEF), Institute of Energy Futures, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK)

Abstract

This paper investigates the thermohydraulic performance of finned-tube supercritical carbon dioxide (sCO 2 ) gas coolers operating with refrigerant pressures near the critical point. A distributed modelling approach combined with the ε-NTU method has been developed for the simulation of the gas cooler. The heat transfer and pressure drop for each evenly divided segment are calculated using empirical correlations for Nusselt number and friction factor. The model was validated against test results and then used to investigate the influence of design and operating parameters on local and overall gas cooler performance. The results show that the refrigerant heat-transfer coefficient increases with decreasing temperature and reaches its maximum close to the pseudocritical temperature before beginning to decrease. The pressure drop increases along the flow direction with decreasing temperature. Overall performance results illustrate that higher refrigerant mass flow rate and decreasing finned-tube diameter lead to improved heat-transfer rates but also increased pressure drops. Design optimization of gas coolers should take into consideration their impact on overall refrigeration performance and life cycle cost. This is important in the drive to reduce the footprint of components, energy consumption, and environmental impacts of refrigeration and heat-pump systems. The present work provides practical guidance to the design of finned-tube gas coolers and can be used as the basis for the modelling of integrated sCO 2 refrigeration and heat-pump systems.

Suggested Citation

  • Lei Chai & Konstantinos M. Tsamos & Savvas A. Tassou, 2020. "Modelling and Evaluation of the Thermohydraulic Performance of Finned-Tube Supercritical Carbon Dioxide Gas Coolers," Energies, MDPI, vol. 13(5), pages 1-19, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1031-:d:325047
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    References listed on IDEAS

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    1. Ge, Y.T. & Tassou, S.A. & Santosa, I. Dewa & Tsamos, K., 2015. "Design optimisation of CO2 gas cooler/condenser in a refrigeration system," Applied Energy, Elsevier, vol. 160(C), pages 973-981.
    2. Austin, Brian T. & Sumathy, K., 2011. "Transcritical carbon dioxide heat pump systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 4013-4029.
    3. Tsamos, K.M. & Ge, Y.T. & Santosa, I.D.M.C. & Tassou, S.A., 2017. "Experimental investigation of gas cooler/condenser designs and effects on a CO2 booster system," Applied Energy, Elsevier, vol. 186(P3), pages 470-479.
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    Cited by:

    1. Natalia Rydalina & Elena Antonova & Irina Akhmetova & Svetlana Ilyashenko & Olga Afanaseva & Vincenzo Bianco & Alexander Fedyukhin, 2020. "Analysis of the Efficiency of Using Heat Exchangers with Porous Inserts in Heat and Gas Supply Systems," Energies, MDPI, vol. 13(22), pages 1-13, November.
    2. Charalampos Alexopoulos & Osama Aljolani & Florian Heberle & Tryfon C. Roumpedakis & Dieter Brüggemann & Sotirios Karellas, 2020. "Design Evaluation for a Finned-Tube CO 2 Gas Cooler in Residential Applications," Energies, MDPI, vol. 13(10), pages 1-17, May.
    3. Haicai Lyu & Han Wang & Qincheng Bi & Fenglei Niu, 2022. "Experimental Investigation on Heat Transfer and Pressure Drop of Supercritical Carbon Dioxide in a Mini Vertical Upward Flow," Energies, MDPI, vol. 15(17), pages 1-14, August.

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