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Theoretical analysis of a liquid desiccant based indirect evaporative cooling system

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  • Cui, X.
  • Islam, M.R.
  • Mohan, B.
  • Chua, K.J.

Abstract

A compact desiccant-evaporative HMX (heat and mass exchanger) has been proposed by combining the benefits of the regenerative indirect evaporative cooling and the liquid desiccant dehumidification. In this design, the compact HMX was able to cool and dehumidify the product air simultaneously in a single unit. A computational model has been developed and validated using experimental data. The model displayed good agreement with the experimental findings with maximum discrepancy of 8%. The heat and mass transfer behavior was theoretically investigated to illustrate the detailed air treatment performance of the HMX. Simulations were performed to study the effect of several key parameters on the HMX's performance. Due to the effect of pre-cooling and pre-dehumidification, the working air showed improved cooling potential in the working channel. Consequently, the temperature of the product air could be reduced below the dew-point temperature of intake air. Simulation results showed that the outlet temperature of the product air was affected by the working-to-intake air flow rate ratio and the dimensionless channel length, while the outlet humidity ratio of the product air was influenced by the length of the liquid desiccant film and the dimensionless channel length.

Suggested Citation

  • Cui, X. & Islam, M.R. & Mohan, B. & Chua, K.J., 2016. "Theoretical analysis of a liquid desiccant based indirect evaporative cooling system," Energy, Elsevier, vol. 95(C), pages 303-312.
    • Handle: RePEc:eee:energy:v:95:y:2016:i:c:p:303-312
    DOI: 10.1016/j.energy.2015.12.032
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    5. Wang, Xinli & Cai, Wenjian & Yin, Xiaohong, 2017. "A global optimized operation strategy for energy savings in liquid desiccant air conditioning using self-adaptive differential evolutionary algorithm," Applied Energy, Elsevier, vol. 187(C), pages 410-423.
    6. Kim, Min-Hwi & Dong, Hae-Won & Park, Joon-Young & Jeong, Jae-Weon, 2016. "Primary energy savings in desiccant and evaporative cooling-assisted 100% outdoor air system combined with a fuel cell," Applied Energy, Elsevier, vol. 180(C), pages 446-456.
    7. Zhang, Hongkuan & Ma, Hongting & Ma, Shuo, 2022. "Energy, exergy, economic and environmental analysis of an indirect evaporative cooling integrated with liquid dehumidification," Energy, Elsevier, vol. 253(C).
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    9. Li, Wuyan & Li, Yongcai & Shi, Wenxing & Lu, Jun, 2021. "Energy and exergy study on indirect evaporative cooler used in exhaust air heat recovery," Energy, Elsevier, vol. 235(C).
    10. Qian Chen & Muhammad Burhan & M Kum Ja & Muhammad Wakil Shahzad & Doskhan Ybyraiymkul & Hongfei Zheng & Xin Cui & Kim Choon Ng, 2022. "Hybrid Indirect Evaporative Cooling-Mechanical Vapor Compression System: A Mini-Review," Energies, MDPI, vol. 15(20), pages 1-17, October.
    11. Ali, Ameer & Ishaque, Kashif & Lashin, Aref & Al Arifi, Nassir, 2017. "Modeling of a liquid desiccant dehumidification system for close type greenhouse cultivation," Energy, Elsevier, vol. 118(C), pages 578-589.
    12. Dong, Hye-Won & Lee, Sung-Joon & Yoon, Dong-Seob & Park, Joon-Young & Jeong, Jae-Weon, 2017. "Impact of district heat source on primary energy savings of a desiccant-enhanced evaporative cooling system," Energy, Elsevier, vol. 123(C), pages 432-444.
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