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Modeling comparison and theoretical study of mass transfer characteristics for desiccant coated air channel under isothermal dehumidification

Author

Listed:
  • Liu, Lin
  • Huang, Hongyu
  • Li, Jun
  • Bai, Yu
  • Wu, Rongjun
  • He, Zhaohong
  • Deng, Lisheng
  • Kubota, Mitsuhiro
  • Kobayashi, Noriyuki

Abstract

Coupled heat and mass transfer phenomena are encountered in desiccant coated dehumidifier, and their numerical modeling is becoming indispensable. In this study, three conjugate heat and mass transfer models were compared to clarify the effects of interparticle mass transfer and local kinetic non-equilibrium on modeling accuracy, and the models were validated by experiment results of silica gel and FAM Z01 coated dehumidifiers with single one air channel. Furthermore, a parametric study on the separate mass transfer characteristics of the dehumidifier under isothermal dehumidification was conducted based on one of the improved models. Results demonstrated that the effect of interparticle mass transfer should be involved, while the local kinetic non-equilibrium tends to be considered for desiccants with steep isotherm shape. Parametric study revealed that as air velocity increases, both air- and solid-side mass transfer change significantly, while desiccant layer thickness, interparticle porosity and isotherm shape mainly affect solid-side mass transfer. The average mass transfer Biot numbers Bim of desiccant layer with relative low thickness of 0.1 mm under various parameters are in the same order of magnitude as 1, indicating that the mass transfer resistance on solid side cannot be ignored generally.

Suggested Citation

  • Liu, Lin & Huang, Hongyu & Li, Jun & Bai, Yu & Wu, Rongjun & He, Zhaohong & Deng, Lisheng & Kubota, Mitsuhiro & Kobayashi, Noriyuki, 2023. "Modeling comparison and theoretical study of mass transfer characteristics for desiccant coated air channel under isothermal dehumidification," Energy, Elsevier, vol. 274(C).
    • Handle: RePEc:eee:energy:v:274:y:2023:i:c:s0360544223007260
    DOI: 10.1016/j.energy.2023.127332
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    References listed on IDEAS

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    1. Liu, Lin & Kubota, Mitsuhiro & Li, Jun & Kimura, Hayato & Bai, Yu & Wu, Rongjun & Deng, Lisheng & Huang, Hongyu & Kobayashi, Noriyuki, 2022. "Comparative study on the water uptake kinetics and dehumidification performance of silica gel and aluminophosphate zeolites coatings," Energy, Elsevier, vol. 242(C).
    2. Vivekh, P. & Kumja, M. & Bui, D.T. & Chua, K.J., 2018. "Recent developments in solid desiccant coated heat exchangers – A review," Applied Energy, Elsevier, vol. 229(C), pages 778-803.
    3. Jagirdar, Mrinal & Lee, Poh Seng, 2018. "Mathematical modeling and performance evaluation of a desiccant coated fin-tube heat exchanger," Applied Energy, Elsevier, vol. 212(C), pages 401-415.
    4. Ge, T.S. & Dai, Y.J. & Wang, R.Z. & Peng, Z.Z., 2010. "Experimental comparison and analysis on silica gel and polymer coated fin-tube heat exchangers," Energy, Elsevier, vol. 35(7), pages 2893-2900.
    5. Venegas, Tomas & Qu, Ming & Nawaz, Kashif & Wang, Lingshi, 2021. "Critical review and future prospects for desiccant coated heat exchangers: Materials, design, and manufacturing," Renewable and Sustainable Energy Reviews, Elsevier, vol. 151(C).
    6. Zheng, X. & Ge, T.S. & Wang, R.Z., 2014. "Recent progress on desiccant materials for solid desiccant cooling systems," Energy, Elsevier, vol. 74(C), pages 280-294.
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