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Experimental research on the pull-down performance of an ejector enhanced auto-cascade refrigeration system for low-temperature freezer

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  • Bai, Tao
  • Yan, Gang
  • Yu, Jianlin

Abstract

This paper presents an experimental investigation on pull-down performance of an ejector enhanced auto-cascade refrigeration cycle for low-temperature freezer application. The pull-down performances of the freezer established on the ejector enhanced cycle and conventional auto-cascade refrigeration cycle were compared. Additionally, operation behaviors of the ejector and the new cycle based freezer at different mixture concentrations and throttle valve openings were investigated. The results indicated that ejector enhanced system exhibited shorter pull-down time and lower freezer air temperature after continuous operation in comparison with the conventional system. And the pull-down time was saved by 34.4% and the energy consumption of the compressor was reduced by 29.6% at the desired freezing temperature of −40 °C.The largest time average values of the pressure lift ratio and entrainment ratio reached up to 2.854 and 1.340, and the time average compression ratio of the compressor was reduced by 11.6% due to the effective pressure lifting effect of the ejector. The optimal mass fraction ratio of 30%/70% for the mixture R23/R134a was proposed with respect to the shortest pull-down time. This research may offer good guidelines for further improving the performance of the auto-cascade refrigeration system in low-temperature freezer.

Suggested Citation

  • Bai, Tao & Yan, Gang & Yu, Jianlin, 2018. "Experimental research on the pull-down performance of an ejector enhanced auto-cascade refrigeration system for low-temperature freezer," Energy, Elsevier, vol. 157(C), pages 647-657.
    • Handle: RePEc:eee:energy:v:157:y:2018:i:c:p:647-657
    DOI: 10.1016/j.energy.2018.05.205
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    References listed on IDEAS

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    1. Bai, Tao & Yu, Jianlin & Yan, Gang, 2016. "Advanced exergy analysis on a modified auto-cascade freezer cycle with an ejector," Energy, Elsevier, vol. 113(C), pages 385-398.
    2. 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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    5. Jeon, Yongseok & Jung, Jongho & Kim, Dongwoo & Kim, Sunjae & Kim, Yongchan, 2017. "Effects of ejector geometries on performance of ejector-expansion R410A air conditioner considering cooling seasonal performance factor," Applied Energy, Elsevier, vol. 205(C), pages 761-768.
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    Cited by:

    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. Gao, Yu & He, Guogeng & Cai, Dehua & Fan, Mingjing, 2020. "Performance evaluation of a modified R290 dual-evaporator refrigeration cycle using two-phase ejector as expansion device," Energy, Elsevier, vol. 212(C).
    3. Feng, Xu & Wu, Yuting & Du, Yanjun & Qi, Di, 2024. "Optimization and performance improvement of ultra-low temperature cascade refrigeration system based on the isentropic efficiency curve of single-screw compressor," Energy, Elsevier, vol. 298(C).
    4. Besagni, Giorgio, 2019. "Ejectors on the cutting edge: The past, the present and the perspective," Energy, Elsevier, vol. 170(C), pages 998-1003.
    5. 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).
    6. Michał Sobieraj, 2020. "Experimental Investigation of the Effect of a Recuperative Heat Exchanger and Throttles Opening on a CO 2 /Isobutane Autocascade Refrigeration System," Energies, MDPI, vol. 13(20), pages 1-15, October.
    7. Rostamzadeh, Hadi & Nourani, Pejman, 2019. "Investigating potential benefits of a salinity gradient solar pond for ejector refrigeration cycle coupled with a thermoelectric generator," Energy, Elsevier, vol. 172(C), pages 675-690.
    8. Zhenzhen Liu & Jingde Jiang & Zilong Wang & Hua Zhang, 2023. "Thermodynamic Analysis of an Innovative Cold Energy Storage System for Auto-Cascade Refrigeration Applications," Energies, MDPI, vol. 16(5), pages 1-17, February.
    9. 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.

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