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Energy and Conventional Exergy Analysis of an Integrated Transcritical CO 2 (R-744) Refrigeration System

Author

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  • Engin Söylemez

    (Process and Power Research Group Trondheim, Department of Energy and Process Engineering, Norwegian University of Science and Technology, 7194 Trondheim, Norway)

Abstract

This study analyses the performance of an integrated transcritical CO 2 (R-744) refrigeration system operating in winter conditions within a supermarket in Trento, north Italy. This system fulfils multiple functions, providing the heating (for domestic hot water and space heating), cooling, and freezing capabilities for the supermarket. Energy analysis reveals that the average value of the total coefficient of performance, total COP, over the entire study period is calculated at 2.47. Notably, the medium-temperature (MT) compressor rack exhibits the highest power consumption, especially in sub −5 °C conditions. The auxiliary (AUX) compressor rack and the gas cooler (GC) fan contribute significantly to the electrical power usage. The air conditioning (AC) heating load is consistently high, averaging 41.6 kW, while the domestic hot water (DHW) heating load remains stable at approximately 5 kW. The refrigeration demands include an average MT cooling load of 25.86 kW and a low-temperature (LT) freezing load of 10–15 kW, with an average of 13.76 kW. The current study also delves into exergy analysis, disclosing an overall system exergy efficiency of 22.4%. The AUX compressor rack is identified as the primary exergy destructor, followed by the GC, AC coils, MT compressor rack, and the ejector. The LT compressor rack has the highest exergy efficiency, followed by the MT and LT expansion valves.

Suggested Citation

  • Engin Söylemez, 2024. "Energy and Conventional Exergy Analysis of an Integrated Transcritical CO 2 (R-744) Refrigeration System," Energies, MDPI, vol. 17(2), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:2:p:479-:d:1321934
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    References listed on IDEAS

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    1. Bai, Tao & Yan, Gang & Yu, Jianlin, 2015. "Thermodynamics analysis of a modified dual-evaporator CO2 transcritical refrigeration cycle with two-stage ejector," Energy, Elsevier, vol. 84(C), pages 325-335.
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    3. Chen, Jianyong & Havtun, Hans & Palm, Björn, 2015. "Conventional and advanced exergy analysis of an ejector refrigeration system," Applied Energy, Elsevier, vol. 144(C), pages 139-151.
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