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Thermodynamic Performance Investigation of Commercial R744 Booster Refrigeration Plants Based on Advanced Exergy Analysis

Author

Listed:
  • Paride Gullo

    (Department of Energy and Process Engineering, NTNU Norwegian University of Science and Technology, Kolbjørn Hejes vei 1D, 7491 Trondheim, Norway)

  • Armin Hafner

    (Department of Energy and Process Engineering, NTNU Norwegian University of Science and Technology, Kolbjørn Hejes vei 1D, 7491 Trondheim, Norway)

  • Krzysztof Banasiak

    (Department of Thermal Energy, SINTEF Energy Research, Kolbjørn Hejes vei 1A, 7491 Trondheim, Norway)

Abstract

After the recent renewed interest in CO 2 as the refrigerant (R744) for the food retail industry, many researchers have focused on the performance enhancement of the basic transcritical R744 supermarket refrigeration unit in warm climates. This task is generally fulfilled with the aid of energy-based methods. However, the implementation of an advanced exergy analysis is mandatory to properly evaluate the best strategies needing to be implemented to achieve the greatest thermodynamic performance improvements. Such an assessment, in fact, is widely recognized as the most powerful thermodynamic tool for this purpose. In this work, the advanced exergy analysis was applied to a conventional R744 booster supermarket refrigerating system at the outdoor temperature of 40 °C. The results obtained suggested the adoption of a more sophisticated layout, i.e., the one outfitted with the multi-ejector block. It was found that the multi-ejector supported CO 2 system can reduce the total exergy destruction rate by about 39% in comparison with the conventional booster unit. Additionally, the total avoidable exergy destruction rate was decreased from 67.60 to 45.57 kW as well as the total unavoidable exergy destruction rate was brought from 42.67 down to 21.91 kW.

Suggested Citation

  • Paride Gullo & Armin Hafner & Krzysztof Banasiak, 2019. "Thermodynamic Performance Investigation of Commercial R744 Booster Refrigeration Plants Based on Advanced Exergy Analysis," Energies, MDPI, vol. 12(3), pages 1-24, January.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:3:p:354-:d:200197
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    References listed on IDEAS

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    Cited by:

    1. Benlin Shi & Muqing Chen & Weikai Chi & Qichao Yang & Guangbin Liu & Yuanyang Zhao & Liansheng Li, 2022. "Effects of Internal Heat Exchanger on Two-Stage Compression Trans-Critical CO 2 Refrigeration Cycle Combined with Expander and Intercooling," Energies, MDPI, vol. 16(1), pages 1-16, December.
    2. Yuyao Sun & Jinfeng Wang & Jing Xie, 2021. "Performance Optimizations of the Transcritical CO 2 Two-Stage Compression Refrigeration System and Influences of the Auxiliary Gas Cooler," Energies, MDPI, vol. 14(17), pages 1-17, September.
    3. Paride Gullo & Armin Hafner & Krzysztof Banasiak & Silvia Minetto & Ekaterini E. Kriezi, 2019. "Multi-Ejector Concept: A Comprehensive Review on its Latest Technological Developments," Energies, MDPI, vol. 12(3), pages 1-29, January.
    4. Sahar Taslimi Taleghani & Mikhail Sorin & Sébastien Poncet, 2019. "Analysis and Optimization of Exergy Flows inside a Transcritical CO 2 Ejector for Refrigeration, Air Conditioning and Heat Pump Cycles," Energies, MDPI, vol. 12(9), pages 1-15, May.
    5. Liu, Shengchun & Lu, Fenping & Dai, Baomin & Nian, Victor & Li, Hailong & Qi, Haifeng & Li, Jiayu, 2019. "Performance analysis of two-stage compression transcritical CO2 refrigeration system with R290 mechanical subcooling unit," Energy, Elsevier, vol. 189(C).
    6. Artur Bieniek & Jan Kuchmacz & Karol Sztekler & Lukasz Mika & Ewelina Radomska, 2021. "A New Method of Regulating the Cooling Capacity of a Cooling System with CO 2," Energies, MDPI, vol. 14(7), pages 1-18, March.

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