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Optimization on crucial ejector geometries in a multi-evaporator refrigeration system for tropical region refrigerated trucks

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  • Li, Shengyu
  • Yan, Jia
  • Liu, Zhan
  • Yao, Yong
  • Li, Xianbi
  • Wen, Na
  • Zou, Guorong

Abstract

In this paper, a novel ejector-based multi-evaporator refrigeration system using R134a is proposed to meet different working modes of refrigerated trucks running in tropical regions. The Computational Fluid Dynamics (CFD) simulation is implemented to research the performance of ejectors utilized in both air conditioning - refrigerating mode and air conditioning - freezing mode. Consequently, crucial ejector geometrical parameters such as area ratio (AR), nozzle exit position (NXP), lengths of primary nozzle and diffuser are optimized for each mode. Moreover, a novel approach by taking the deviation of the entrainment ratio or secondary mass flow rate over the deviation of the geometrical parameter into account to evaluate the ejector performance sensitivity to each geometrical parameter is first time presented to the best of the authors’ knowledge. The results show that: 1) Area ratio, NXP, lengths of primary nozzle and diffuser of the ejector in the air conditioning - freezing mode are almost twice as those in the air conditioning - refrigerating mode; 2) The performance of both ejectors is primarily influenced by area ratio and NXP; 3) The proposed sensitivity indicator can better evaluate the sensitivity of the ejector performance to geometrical parameters.

Suggested Citation

  • Li, Shengyu & Yan, Jia & Liu, Zhan & Yao, Yong & Li, Xianbi & Wen, Na & Zou, Guorong, 2019. "Optimization on crucial ejector geometries in a multi-evaporator refrigeration system for tropical region refrigerated trucks," Energy, Elsevier, vol. 189(C).
    • Handle: RePEc:eee:energy:v:189:y:2019:i:c:s0360544219320420
    DOI: 10.1016/j.energy.2019.116347
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    References listed on IDEAS

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    Cited by:

    1. Braimakis, Konstantinos, 2021. "Solar ejector cooling systems: A review," Renewable Energy, Elsevier, vol. 164(C), pages 566-602.
    2. Chen, Hongjie & Zhu, Jiahua & Ge, Jing & Lu, Wei & Zheng, Lixing, 2020. "A cylindrical mixing chamber ejector analysis model to predict the optimal nozzle exit position," Energy, Elsevier, vol. 208(C).
    3. Jeon, Yongseok & Kim, Sunjae & Lee, Sang Hun & Chung, Hyun Joon & Kim, Yongchan, 2020. "Seasonal energy performance characteristics of novel ejector-expansion air conditioners with low-GWP refrigerants," Applied Energy, Elsevier, vol. 278(C).
    4. Liang, Youcai & Ye, Kai & Zhu, Yan & Lu, Jidong, 2023. "Thermodynamic analysis of two-stage and dual-temperature ejector refrigeration cycles driven by the waste heat of exhaust gas," Energy, Elsevier, vol. 278(C).
    5. 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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