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Experimental investigations on heat and mass transfer performances of a liquid desiccant cooling and dehumidification system

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  • Ou, Xianhua
  • Cai, Wenjian
  • He, Xiongxiong
  • Zhai, Deqing

Abstract

The last decades have witnessed the growth interest in Liquid Desiccant Dehumidification Systems (LDDS). In the conventional LDDS, the high dilution rate of desiccant solution in dehumidifier leads to a high desiccant regeneration frequency, which consequently results in more thermal energy consumed by desiccant regeneration system. Therefore, a more energy efficient Liquid Desiccant Cooling and Dehumidification (LDCD) system is developed in this study, which mainly composes of a cooling coil and dehumidifier. A simple static model is proposed to predict the performances of heat and mass transfer process in this system. The thermal efficiency, moisture effectiveness and desiccant dilution rate are utilized as the performance indicators. The influences of several relevant parameters on the cooling and dehumidification performances of LDCD system are investigated. The model predictions are compared with the experimental data, and the results show that the model predictions are well in line with the experimental data with the maximum errors less than 10%. Moreover, the feasibility of LDCD system in reducing the dilution rate of desiccant solution and the system energy consumption is validated. The results indicate that the dilution rate of desiccant solution and energy consumption of the LDCD system are reduced by 39.64% and 22.3% over the conventional LDDS, respectively.

Suggested Citation

  • Ou, Xianhua & Cai, Wenjian & He, Xiongxiong & Zhai, Deqing, 2018. "Experimental investigations on heat and mass transfer performances of a liquid desiccant cooling and dehumidification system," Applied Energy, Elsevier, vol. 220(C), pages 164-175.
    • Handle: RePEc:eee:appene:v:220:y:2018:i:c:p:164-175
    DOI: 10.1016/j.apenergy.2018.03.087
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    References listed on IDEAS

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    5. Qu, Ke & Barreto, Germilly & Iten, Muriel & Wang, Yuhao & Riffat, Saffa, 2023. "Energy and thermal performance of optimised hollow fibre liquid desiccant cooling and dehumidification systems in mediterranean regions: Modelling, validation and case study," Energy, Elsevier, vol. 263(PC).
    6. Luo, Jielin & Yang, Hongxing, 2022. "A state-of-the-art review on the liquid properties regarding energy and environmental performance in liquid desiccant air-conditioning systems," Applied Energy, Elsevier, vol. 325(C).
    7. Li, Bingxu & Wu, Bingjie & Peng, Yelun & Cai, Wenjian, 2022. "Tube-based robust model predictive control of multi-zone demand-controlled ventilation systems for energy saving and indoor air quality," Applied Energy, Elsevier, vol. 307(C).
    8. Pasqualin, P. & Lefers, R. & Mahmoud, S. & Davies, P.A., 2022. "Comparative review of membrane-based desalination technologies for energy-efficient regeneration in liquid desiccant air conditioning of greenhouses," Renewable and Sustainable Energy Reviews, Elsevier, vol. 154(C).
    9. Tao, Wen & Yimo, Luo & Lin, Lu, 2019. "A novel 3D simulation model for investigating liquid desiccant dehumidification performance based on CFD technology," Applied Energy, Elsevier, vol. 240(C), pages 486-498.
    10. Liang, Cai-Hang & Li, Nan-Feng & Huang, Si-Min, 2020. "Entropy and exergy analysis of an internally-cooled membrane liquid desiccant dehumidifier," Energy, Elsevier, vol. 192(C).
    11. Song, Xia & Zhang, Lun & Zhang, Xiaosong, 2019. "Analysis of the temperatures of heating and cooling sources and the air states in liquid desiccant dehumidification systems regenerated by return air," Energy, Elsevier, vol. 168(C), pages 651-661.
    12. Li, Hongxuan & Zou, Tonghua & Han, Xiaowan & Dai, Baomin & Liu, Jia, 2023. "Numerical and experimental study on the regeneration performance of a liquid desiccant system coupled with rotating packed bed and vacuum," Applied Energy, Elsevier, vol. 336(C).
    13. Liang, Chenjiyu & Li, Xianting & Zheng, Gonghang, 2022. "Optimizing air conditioning systems by considering the grades of sensible and latent heat loads," Applied Energy, Elsevier, vol. 322(C).

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