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Experimental study on the liquid desiccant dehumidification performance of microencapsulated phase change materials slurry

Author

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  • Dong, Honglin
  • Wang, Dandan
  • Niu, Xiaofeng
  • Zhang, Yue
  • He, Xu
  • Ke, Qing
  • Lu, Zhiheng

Abstract

In this study, the idea of using microencapsulated phase change materials slurry (MPCMS) as a liquid desiccant to achieve “auto internally cooled” dehumidification was verified and investigated experimentally. The results indicated that, the addition of MicroPCMs to LiCl solution significantly improved the dehumidification performance, the temperature-rise of the liquid desiccant could be effectively restrained, and the dehumidification performance of the MPCMS improved with the increase in the amount of MicroPCMs. When the mass concentration of the MicroPCMs reached 2.0%, the moisture removal rate and dehumidification effectiveness increased by 24.0% and 23.1%, respectively. The contribution ratio of the phase change endothermic effect of MicroPCMs to the dehumidification enhancement was 50–60%, the reduction of the MPCMS surface vapor pressure also played an important role. The impact of several factors on the dehumidification performance, including the mass concentration of the MicroPCMs, temperature and flow rate of the MPCMS, process air inlet state, and flow rate were analyzed. The dehumidification performance was improved most significantly when the MPCMS inlet temperature was close to the onset phase transformation temperature of the MicroPCMs. In addition, empirical correlations with mean relative deviations of 5.1% and 12.74% were proposed to predict the dehumidification effectiveness and the Sherwood number.

Suggested Citation

  • Dong, Honglin & Wang, Dandan & Niu, Xiaofeng & Zhang, Yue & He, Xu & Ke, Qing & Lu, Zhiheng, 2022. "Experimental study on the liquid desiccant dehumidification performance of microencapsulated phase change materials slurry," Energy, Elsevier, vol. 239(PC).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pc:s0360544221024609
    DOI: 10.1016/j.energy.2021.122212
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    References listed on IDEAS

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    1. Rady, Mohamed, 2009. "Thermal performance of packed bed thermal energy storage units using multiple granular phase change composites," Applied Energy, Elsevier, vol. 86(12), pages 2704-2720, December.
    2. Wen, Tao & Lu, Lin, 2019. "A review of correlations and enhancement approaches for heat and mass transfer in liquid desiccant dehumidification system," Applied Energy, Elsevier, vol. 239(C), pages 757-784.
    3. Liu, Xiaoli & Qu, Ming & Liu, Xiaobing & Wang, Lingshi, 2019. "Membrane-based liquid desiccant air dehumidification: A comprehensive review on materials, components, systems and performances," Renewable and Sustainable Energy Reviews, Elsevier, vol. 110(C), pages 444-466.
    4. Zhang, Qinling & Liu, Xiaohua & Zhang, Tao & Xie, Ying, 2020. "Performance optimization of a heat pump driven liquid desiccant dehumidification system using exergy analysis," Energy, Elsevier, vol. 204(C).
    5. Bai, Hongyu & Zhu, Jie & Chen, Xiangjie & Chu, Junze & Cui, Yuanlong & Yan, Yuying, 2020. "Steady-state performance evaluation and energy assessment of a complete membrane-based liquid desiccant dehumidification system," Applied Energy, Elsevier, vol. 258(C).
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    Cited by:

    1. Niu, Xiaofeng & Ke, Qing & Wang, Zhaohua & Zhou, Junming & Dong, Honglin & Mahian, Omid, 2023. "Study on the regeneration process and overall performance of a microencapsulated phase change material slurry dehumidification system," Renewable Energy, Elsevier, vol. 216(C).
    2. Yang, Tianyu & Ge, Tianshu, 2024. "Performance study of a heat pump fresh air unit based on desiccant coated heat exchangers under different operation strategies," Energy, Elsevier, vol. 296(C).

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