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A dual-scale analysis of a desiccant wheel with a novel organic–inorganic hybrid adsorbent for energy recovery

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  • Fu, Huang-Xi
  • Zhang, Li-Zhi
  • Xu, Jian-Chang
  • Cai, Rong-Rong

Abstract

Desiccant wheels have been extensively used for energy recovery of ventilation air from buildings. Performance of these wheels is influenced by many factors like the material properties, wheel matrix structures, operating conditions and fluid parameters. Previous studies only involved the macro-scale heat and mass transfer in the wheels and the system performance, by neglecting the micro-scale properties of wheel materials. In this study, a dual-scale modeling approach was proposed for a desiccant wheel with a novel organic–inorganic hybrid adsorbent (HA) material which combines high adsorption capability with good mechanical durability. The proposed dual-scale model included a micro-scale molecular dynamics (MD) sub-model for adsorbent material, a macro-scale sub-model for heat and mass transfer in matrix channels and system performance evaluation. The two sub-models were linked together through information exchange to form the dual-scale model. Through modeling, the effects of the micro physical–chemical properties of materials and macro structure of wheels, as well as the operating parameters on system performance were investigated. With the dual-scale model as a design tool, material compositions were optimized. The moisture adsorption capacity of the material was two times higher than that of silica gel B at high relative humidities. Consequently the sensible and latent effectiveness were improved by 12% and 30% respectively.

Suggested Citation

  • Fu, Huang-Xi & Zhang, Li-Zhi & Xu, Jian-Chang & Cai, Rong-Rong, 2016. "A dual-scale analysis of a desiccant wheel with a novel organic–inorganic hybrid adsorbent for energy recovery," Applied Energy, Elsevier, vol. 163(C), pages 167-179.
    • Handle: RePEc:eee:appene:v:163:y:2016:i:c:p:167-179
    DOI: 10.1016/j.apenergy.2015.10.175
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    References listed on IDEAS

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    Cited by:

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    2. Chua, K.J. & Chou, S.K. & Islam, M.R., 2018. "On the experimental study of a hybrid dehumidifier comprising membrane and composite desiccants," Applied Energy, Elsevier, vol. 220(C), pages 934-943.
    3. Feng, Y.H. & Dai, Y.J. & Wang, R.Z. & Ge, T.S., 2022. "Insights into desiccant-based internally-cooled dehumidification using porous sorbents: From a modeling viewpoint," Applied Energy, Elsevier, vol. 311(C).
    4. Speerforck, Arne & Schmitz, Gerhard, 2016. "Experimental investigation of a ground-coupled desiccant assisted air conditioning system," Applied Energy, Elsevier, vol. 181(C), pages 575-585.
    5. Min, Yunran & Chen, Yi & Shi, Wenchao & Yang, Hongxing, 2021. "Applicability of indirect evaporative cooler for energy recovery in hot and humid areas: Comparison with heat recovery wheel," Applied Energy, Elsevier, vol. 287(C).
    6. Shamim, Jubair A. & Hsu, Wei-Lun & Paul, Soumyadeep & Yu, Lili & Daiguji, Hirofumi, 2021. "A review of solid desiccant dehumidifiers: Current status and near-term development goals in the context of net zero energy buildings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).
    7. Shkatulov, Alexandr & Gordeeva, Larisa G. & Girnik, Ilya S. & Huinink, Henk & Aristov, Yuri I., 2020. "Novel adsorption method for moisture and heat recuperation in ventilation: Composites “LiCl/matrix” tailored for cold climate," Energy, Elsevier, vol. 201(C).

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