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Advanced Thermodynamic Analysis of a Transcritical R744 Booster Refrigerating Unit with Dedicated Mechanical Subcooling

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  • Paride Gullo

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

Abstract

In this work the thermodynamic performance of a transcritical R744 booster supermarket refrigeration system equipped with R290 dedicated mechanical subcooling (DMS) was exhaustively investigated with the aid of the advanced exergy analysis. The outcomes obtained suggested that improvement priority needs to be addressed to the manufacturing of more efficient high-stage (HS) compressors, followed by the enhancement of the gas cooler/condenser (GC), of the medium-temperature (MT) evaporators, of the R290 compressor, and of the low-temperature (LT) evaporators. These conclusions were different from those drawn by the application of the conventional exergy assessment. Additionally, it was found that GC can be enhanced mainly by reducing the irreversibilities owing to the simultaneous interaction among the components. The R290 compressor would also have significantly benefitted from the adoption of such measures, as half of its avoidable irreversibilities were exogenous. Unlike the aforementioned components, all the evaporators were improvable uniquely by decreasing their temperature difference. Finally, the approach temperature of GC and the outdoor temperature were found to have a noteworthy impact on the avoidable irreversibilities of the investigated solution.

Suggested Citation

  • Paride Gullo, 2018. "Advanced Thermodynamic Analysis of a Transcritical R744 Booster Refrigerating Unit with Dedicated Mechanical Subcooling," Energies, MDPI, vol. 11(11), pages 1-26, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3058-:d:181105
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    References listed on IDEAS

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    Cited by:

    1. Michal Haida & Rafal Fingas & Wojciech Szwajnoch & Jacek Smolka & Michal Palacz & Jakub Bodys & Andrzej J. Nowak, 2019. "An Object-Oriented R744 Two-Phase Ejector Reduced-Order Model for Dynamic Simulations," Energies, MDPI, vol. 12(7), pages 1-24, April.
    2. 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.
    3. Francisco Amaral & Alex Santos & Ewerton Calixto & Fernando Pessoa & Delano Santana, 2020. "Exergetic Evaluation of an Ethylene Refrigeration Cycle," Energies, MDPI, vol. 13(14), pages 1-21, July.
    4. 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.
    5. Lawrence Drojetzki & Mieczyslaw Porowski, 2023. "Outdoor Climate as a Decision Variable in the Selection of an Energy-Optimal Refrigeration System Based on Natural Refrigerants for a Supermarket," Energies, MDPI, vol. 16(8), pages 1-24, April.
    6. 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.
    7. 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).

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