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Dehumidification Effect of Polymeric Superabsorbent SAP-LiCl Composite Desiccant-Coated Heat Exchanger with Different Cyclic Switching Time

Author

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  • Bivas Panigrahi

    (Department of Refrigeration, Air Conditioning and Energy Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan)

  • Yu Sheng Chen

    (Department of Refrigeration, Air Conditioning and Energy Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan)

  • Win Jet Luo

    (Department of Refrigeration, Air Conditioning and Energy Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan
    Graduate Institute of Precision Manufacturing, National Chin-Yi University of Technology, Taichung 41170, Taiwan)

  • Hung Wei Wang

    (Department of Refrigeration, Air Conditioning and Energy Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan)

Abstract

This study investigated a composite polymer desiccant material’s performance, which is prepared by impregnating solid desiccant such as sodium polyacrylate (SAP) on to hygroscopic salts such as lithium chloride (LiCl). Dehumidification performance of the proposed composite polymer desiccant (SAP-LiCl) was analyzed by coating the suitable weight percentage (wt %) of the desiccant onto a single fin-tube heat exchanger (FTHE) system and testing the desiccant-coated heat exchanger (DCHE) in a testing tunnel under various operating conditions. Net dehumidification efficacy of DCHE in terms of sorption and desorption amount and thermal performance (COP th ) were analyzed. For instance, with processed air inflow temperature, relative humidity and regeneration temperature setting of 30 °C, 80% RH and 70 °C, DCHE’s sorption, desorption amount and COP th were recorded as high as 945.1 g, 1115.1 g, and 0.39, respectively. It was further realized that the performance of the DCHE could be enhanced by modulating the cyclic switching time for dehumidification and regeneration processes. For instance, with the aforementioned processed airflow conditions, when the cyclic switching time tuned as 60 min instead of 10 min for a total time period of 120 min, there is a net 58% improvement to the COP th of the system. It was further observed that, under the same time period corresponding to the increase in cyclic switching time, the overall COP th can be enhanced; however, the water vapor sorption and desorption amounts of desiccant were decreased.

Suggested Citation

  • Bivas Panigrahi & Yu Sheng Chen & Win Jet Luo & Hung Wei Wang, 2020. "Dehumidification Effect of Polymeric Superabsorbent SAP-LiCl Composite Desiccant-Coated Heat Exchanger with Different Cyclic Switching Time," Sustainability, MDPI, vol. 12(22), pages 1-16, November.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:22:p:9673-:d:447962
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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. Wu, X.N. & Ge, T.S. & Dai, Y.J. & Wang, R.Z., 2018. "Review on substrate of solid desiccant dehumidification system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 3236-3249.
    3. Kun-Ying Li & Win-Jet Luo & Bo-Yi Tsai & Yean-Der Kuan, 2020. "Performance Analysis of Two-Stage Solid Desiccant Densely Coated Heat Exchangers," Sustainability, MDPI, vol. 12(18), pages 1-19, September.
    4. Win-Jet Luo & Dini Faridah & Fikri Rahmat Fasya & Yu-Sheng Chen & Fikri Hizbul Mulki & Utami Nuri Adilah, 2019. "Performance Enhancement of Hybrid Solid Desiccant Cooling Systems by Integrating Solar Water Collectors in Taiwan," Energies, MDPI, vol. 12(18), pages 1-18, September.
    5. 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.
    6. 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).
    7. 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).
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    1. 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).

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