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Performance evaluation of a modified refrigeration cycle with parallel compression for refrigerator-freezer applications

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  • Fang, Zhongcheng
  • Fan, Chaochao
  • Yan, Gang
  • Yu, Jianlin

Abstract

This paper proposes a modified refrigeration cycle (MRC) with zeotropic mixture R290/R600a for refrigerator-freezer applications. In the MRC, the use of two parallel compressors enables the two evaporators to be operated at two proper evaporation temperatures, which reduces the irreversibility of evaporator heat transfer processes. Noted that a subcooler is installed between the two loops for improving the system performance. Moreover, the MRC applies a phase separator to ensure more low-boiling point refrigerant to go to the freezer evaporator for increasing the freezer evaporation pressure. Energy and exergy performances of MRC are investigated based on a thermodynamic model. The simulation results indicate that compared with the conventional refrigeration cycle (CRC), the COP and exergy efficiency of MRC obtain the same improvement of 30.4% at a fixed condensation temperature of 35 °C. In addition, from the viewpoint of exergy analysis, the high priority in need of improvement for the MRC is ordered as the compressors, condensers, expansion valves, two evaporators, subcooler and internal heat exchanger. Generally, applying the MRC could be an effective and practical method to enhance refrigerator-freezer energy efficiency.

Suggested Citation

  • Fang, Zhongcheng & Fan, Chaochao & Yan, Gang & Yu, Jianlin, 2019. "Performance evaluation of a modified refrigeration cycle with parallel compression for refrigerator-freezer applications," Energy, Elsevier, vol. 188(C).
    • Handle: RePEc:eee:energy:v:188:y:2019:i:c:s0360544219317888
    DOI: 10.1016/j.energy.2019.116093
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    References listed on IDEAS

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    Cited by:

    1. Qi Chen & Yinsong Li, 2022. "Experimental Investigation on Intermittent Operation Characteristics of Dual-Temperature Refrigeration System Using Hydrocarbon Mixture," Energies, MDPI, vol. 15(11), pages 1-19, May.
    2. Biglia, Alessandro & Gemmell, Andrew J. & Foster, Helen J. & Evans, Judith A., 2020. "Energy performance of domestic cold appliances in laboratory and home environments," Energy, Elsevier, vol. 204(C).
    3. Chen, Qi & Yu, Mengqi & Yan, Gang & Yu, Jianlin, 2022. "Thermodynamic analyses of a modified ejector enhanced dual temperature refrigeration cycle for domestic refrigerator/freezer application," Energy, Elsevier, vol. 244(PA).

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