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Study on optimization of indirect-direct evaporative chiller for producing cold water in hot and dry areas

Author

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  • Chu, Junjie
  • Xu, Wei
  • Huang, Xiang
  • Geng, Zhichao
  • Xuan, Jingwen

Abstract

This paper proposes the concept of “sub-wet bulb temperature” for the application of evaporative cooling technology, discusses the principle and implementation approach of the indirect-direct evaporative chiller for producing sub-wet bulb temperature cold water, and puts forward a way to describe the cooling performance of the pre-cooling section of indirect evaporative cooling through “sub-wet bulb efficiency”, using the “cooling efficiency of the water drenching filler on the air side and the water side” to show the cooling performance of the direct evaporative cooling section of the Water drenching filler, and utilizing the “unit's chilled water efficiency” to describe the cooling performance of the whole unit, and then explicit equation for predicting the unit's water supply temperature is derived out. The cooling performance of evaporative cooling chillers under different ambient air pre-cooling types was tested in Xinjiang region. The results showed that the chilled water efficiency of evaporative chillers reached a maximum value of 45.9 under the coil and vertical tube type of indirect evaporative pre-cooling form. At this time, the sub-wet bulb efficiency of the pre-cooling section of indirect evaporative cooling is 52.1%, the cooling efficiency of the water drenching filler on the air side has reached to 59.8%, and the water supply temperature of the unit is 13.7 °C, which is 2.3 °C lower than the wet bulb temperature of ambient air.

Suggested Citation

  • Chu, Junjie & Xu, Wei & Huang, Xiang & Geng, Zhichao & Xuan, Jingwen, 2022. "Study on optimization of indirect-direct evaporative chiller for producing cold water in hot and dry areas," Renewable Energy, Elsevier, vol. 181(C), pages 898-913.
    • Handle: RePEc:eee:renene:v:181:y:2022:i:c:p:898-913
    DOI: 10.1016/j.renene.2021.09.085
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    References listed on IDEAS

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    1. Xu, Peng & Ma, Xiaoli & Diallo, Thierno M.O. & Zhao, Xudong & Fancey, Kevin & Li, Deying & Chen, Hongbing, 2016. "Numerical investigation of the energy performance of a guideless irregular heat and mass exchanger with corrugated heat transfer surface for dew point cooling," Energy, Elsevier, vol. 109(C), pages 803-817.
    2. Xu, Peng & Ma, Xiaoli & Zhao, Xudong & Fancey, Kevin, 2017. "Experimental investigation of a super performance dew point air cooler," Applied Energy, Elsevier, vol. 203(C), pages 761-777.
    3. Anisimov, Sergey & Pandelidis, Demis & Jedlikowski, Andrzej & Polushkin, Vitaliy, 2014. "Performance investigation of a M (Maisotsenko)-cycle cross-flow heat exchanger used for indirect evaporative cooling," Energy, Elsevier, vol. 76(C), pages 593-606.
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    Cited by:

    1. Fang, Ranran & Luo, Chongfu & Pan, Zhonglin & Li, Junchang & Xu, Fulei & Zheng, Jiangen & Mao, Xuefeng & Wang, Xiaofa & Li, Rui & Wei, Yongbin & Chen, Yijing & Vorobyev, Anatoliy Y., 2024. "Efficient harvesting of renewable evaporative energy from atmospheric air through hierarchical nano/microscale shaping of air-water interface," Applied Energy, Elsevier, vol. 358(C).
    2. Yan, Weichao & Cui, Xin & Meng, Xiangzhao & Yang, Chuanjun & Zhang, Yu & Liu, Yilin & An, Hui & Jin, Liwen, 2024. "Multi-objective optimization of hollow fiber membrane-based water cooler for enhanced cooling performance and energy efficiency," Renewable Energy, Elsevier, vol. 222(C).

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