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Performance evaluation of PVA-LiCl coated heat exchangers for next-generation of energy-efficient dehumidification

Author

Listed:
  • Vivekh, P.
  • Bui, D.T.
  • Wong, Y.
  • Kumja, M.
  • Chua, K.J.

Abstract

The conventional vapor-compression air-conditioner operates with low efficiency because of the intrinsic coupling between sensible and latent cooling. Its efficiency can be improved via employing solid desiccant coated heat exchangers (DCHEs). Dehumidification performance of a DCHE is influenced by the nature of the selected desiccant material. The key attributes of a desiccating material include higher sorption capacity and faster kinetics coupled with its ability to regenerate at a low temperature. In this paper, we developed different concentrations of composite polymer desiccant with polyvinyl alcohol (PVA) and lithium chloride (LiCl). Experiments on isotherms indicated that the composite PVA with a greater concentration of LiCl displayed superior sorption capacity; however, due to the occurrence of deliquescence phenomenon, the most effective concentration of LiCl was observed to be 50w%. The equilibrium sorption capacity of PVA-LiCl (50w%) was 177.2% in contrast to only 28% for silica gel. Further, kinetics revealed that silica gel would take twice the time to adsorb an equivalent amount of water vapor as absorbed by composite polymer desiccant. Our experimental findings on dehumidification performance and process efficacy revealed that the use of composite PVA on DCHEs yielded about 20–60% improvement in moisture removal capacity and thermal coefficient of performance. Lastly, energy analysis indicated that the novel composite polymer DCHE enabled high moisture removal rate even at lower regeneration temperature and recorded a significant saving of 54% in specific power consumption.

Suggested Citation

  • Vivekh, P. & Bui, D.T. & Wong, Y. & Kumja, M. & Chua, K.J., 2019. "Performance evaluation of PVA-LiCl coated heat exchangers for next-generation of energy-efficient dehumidification," Applied Energy, Elsevier, vol. 237(C), pages 733-750.
    • Handle: RePEc:eee:appene:v:237:y:2019:i:c:p:733-750
    DOI: 10.1016/j.apenergy.2019.01.018
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    References listed on IDEAS

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    1. Ge, T.S. & Zhang, J.Y. & Dai, Y.J. & Wang, R.Z., 2017. "Experimental study on performance of silica gel and potassium formate composite desiccant coated heat exchanger," Energy, Elsevier, vol. 141(C), pages 149-158.
    2. Entezari, Akram & Ge, T.S. & Wang, R.Z., 2018. "Water adsorption on the coated aluminum sheets by composite materials (LiCl + LiBr)/silica gel," Energy, Elsevier, vol. 160(C), pages 64-71.
    3. Zheng, X. & Wang, R.Z. & Ge, T.S. & Hu, L.M., 2015. "Performance study of SAPO-34 and FAPO-34 desiccants for desiccant coated heat exchanger systems," Energy, Elsevier, vol. 93(P1), pages 88-94.
    4. 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.
    5. Oh, Seung Jin & Ng, Kim Choon & Chun, Wongee & Chua, Kian Jon Ernest, 2017. "Evaluation of a dehumidifier with adsorbent coated heat exchangers for tropical climate operations," Energy, Elsevier, vol. 137(C), pages 441-448.
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    Cited by:

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    3. Karmakar, Avishek & Prabakaran, Vivekh & Zhao, Dan & Chua, Kian Jon, 2020. "A review of metal-organic frameworks (MOFs) as energy-efficient desiccants for adsorption driven heat-transformation applications," Applied Energy, Elsevier, vol. 269(C).
    4. Vivekh, P. & Bui, D.T. & Islam, M.R. & Zaw, K. & Chua, K.J., 2020. "Experimental performance and energy efficiency investigation of composite superabsorbent polymer and potassium formate coated heat exchangers," Applied Energy, Elsevier, vol. 275(C).
    5. Rashidi, Saman & Kashefi, Mohammad Hossein & Kim, Kyung Chun & Samimi-Abianeh, Omid, 2019. "Potentials of porous materials for energy management in heat exchangers – A comprehensive review," Applied Energy, Elsevier, vol. 243(C), pages 206-232.
    6. Liu, M. & Prabakaran, V. & Bui, T. & Cheng, G.G. & Pang, W., 2023. "Three-dimensional numerical analysis of fin-tube desiccant-coated heat exchanger for air dehumidification in tropics," Applied Energy, Elsevier, vol. 331(C).
    7. 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).
    8. Vivekh, P. & Islam, M.R. & Chua, K.J., 2020. "Experimental performance evaluation of a composite superabsorbent polymer coated heat exchanger based air dehumidification system," Applied Energy, Elsevier, vol. 260(C).
    9. Larisa Gordeeva & Yuri Aristov, 2022. "Adsorbent Coatings for Adsorption Heat Transformation: From Synthesis to Application," Energies, MDPI, vol. 15(20), pages 1-25, October.
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