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Performance analysis of a modified ejector-enhanced auto-cascade refrigeration cycle

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  • Liu, Shuilong
  • Bai, Tao
  • Wei, Yuan
  • Yu, Jianlin

Abstract

In this paper, a modified ejector-enhanced auto-cascade refrigeration cycle with R290/R170 is proposed on the basis of a basic ejector-enhanced auto-cascade refrigeration cycle proposed previously. An additional expansion valve and internal heat exchanger are utilized in the modified cycle and are located after condenser. Refrigerant leaves condenser with smaller quality and then is throttling in expansion valve. Thus, the quality at inlet of separator can be adjusted to meet varying refrigeration capacity as varying ambient temperature. The thermodynamic analyses based on energy and exergy methods are conducted to compare the performances of two cycles. The influences of several critical operating parameters on cycle performances are investigated in detail. The results indicate that the modified cycle can obtain higher COP under the given operating conditions than the basic cycle. The modified cycle presents average improvement of 7.52%–8.86% in COP and 9.28%–11.33% improvement in volumetric refrigeration capacity. Besides, the exergy destruction of condenser, ejector and expansion valves in modified cycle is much less than that in basic cycle. The total exergy destruction of the modified cycle is decreased by 6.65%–8.35%, and exergy efficiency is increased by 7.54%–8.85%. Therefore, the modified cycle shows its energy-saving advantage and application potential in low-temperature refrigeration.

Suggested Citation

  • Liu, Shuilong & Bai, Tao & Wei, Yuan & Yu, Jianlin, 2023. "Performance analysis of a modified ejector-enhanced auto-cascade refrigeration cycle," Energy, Elsevier, vol. 265(C).
    • Handle: RePEc:eee:energy:v:265:y:2023:i:c:s0360544222032200
    DOI: 10.1016/j.energy.2022.126334
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    References listed on IDEAS

    as
    1. Bai, Tao & Yan, Gang & Yu, Jianlin, 2022. "Influence of internal heat exchanger position on the performance of ejector-enhanced auto-cascade refrigeration cycle for the low-temperature freezer," Energy, Elsevier, vol. 238(PC).
    2. Sun, Zhili & Wang, Qifan & Xie, Zhiyuan & Liu, Shengchun & Su, Dandan & Cui, Qi, 2019. "Energy and exergy analysis of low GWP refrigerants in cascade refrigeration system," Energy, Elsevier, vol. 170(C), pages 1170-1180.
    3. 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.
    4. 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.
    5. He, S. & Li, Y. & Wang, R.Z., 2009. "Progress of mathematical modeling on ejectors," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(8), pages 1760-1780, October.
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    Cited by:

    1. Li, Yinlong & Liu, Guoqiang & Chen, Qi & Yan, Gang, 2023. "Progress of auto-cascade refrigeration systems performance improvement: Composition separation, shift and regulation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 187(C).
    2. Tan, Yingying & Li, Xiuzhen & Wang, Lin & Huang, Lisheng & Xiao, Yi & Wang, Zhanwei & Li, Shaoqiang, 2023. "Thermodynamic performance of the fractionated auto-cascade refrigeration cycle coupled with two-phase ejector using R1150/R600a at −80 °C temperature level," Energy, Elsevier, vol. 281(C).
    3. Ge, Jing & Chen, Hongjie & Jin, Yang & Li, Jun, 2023. "Conical-cylindrical mixer ejector design model for predicting optimal nozzle exit position," Energy, Elsevier, vol. 283(C).

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