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Experimental study on performance of silica gel and potassium formate composite desiccant coated heat exchanger

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  • Ge, T.S.
  • Zhang, J.Y.
  • Dai, Y.J.
  • Wang, R.Z.

Abstract

In this paper, composite silica gel and potassium formate as typical organic weak acid salts is proposed to use in desiccant coated heat exchanger (DCHE). An experimental study on dynamic adsorption performance of desiccant coated metal sheet samples is conducted to obtain results with different proportions of silica gel and potassium format. A DCHE testing platform is then used to compare thermodynamic performance between single silica gel coated heat exchanger (SCHE) and composite potassium formate and silica gel coated heat exchanger (PSCHE). It is found that impregnating potassium formate into porous silica gel is an effective method to improve adsorption capacity, and 75% saturated potassium formate solution is recommended to constitute composite desiccant under experimental conditions. Compared with SG coated sheet, on average the maximum adsorption mass of SG&0.75PF coated sheet increases 2–3 times. Besides, PSCHE can obtain about 20% higher moisture removal capacity compared with SCHE under experimental condition, meaning the utilization of composite silica gel and potassium formate desiccant can effectively improve dehumidification capacity. PSCHE also can obtain 50% higher total cooling capacity compared with SCHE.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:141:y:2017:i:c:p:149-158
    DOI: 10.1016/j.energy.2017.09.090
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    2. Wu, X.N. & Ge, T.S. & Dai, Y.J. & Wang, R.Z., 2019. "Investigation on novel desiccant wheel using wood pulp fiber paper with high coating ratio as matrix," Energy, Elsevier, vol. 176(C), pages 493-504.
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    4. Chai, Shaowei & Chen, Erjian & Xie, Mingxi & Zhao, Yao & Dai, Yanjun, 2022. "Experimental study of dehumidification performance and solar thermal energy enhancement properties on a dehumidification system using desiccant coated heat exchanger," Energy, Elsevier, vol. 259(C).
    5. Chen, K. & Zheng, X. & Wang, S.N., 2022. "Investigation on activated carbon-sodium polyacrylate coated aluminum sheets for desiccant coated heat exchanger," Energy, Elsevier, vol. 245(C).
    6. Ge, Lurong & Ge, Tianshu & Wang, Ruzhu, 2022. "Facile synthesis of Al-based MOF and its applications in desiccant coated heat exchangers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 157(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).
    8. 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.
    9. 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).
    10. 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).
    11. Andrew N. Aziz & Raya Al-Dadah & Saad Mahmoud & Mohamed A. Ismail & Mohammed K. Almesfer & Marwa F. El-Kady & Hassan Shokry, 2023. "MOF-801/Graphene Adsorbent Material for Greenhouse Climate Control System—Numerical Investigation," Energies, MDPI, vol. 16(9), pages 1-25, May.
    12. 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.
    13. 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.
    14. Valarezo, Andres S. & Sun, X.Y. & Ge, T.S. & Dai, Y.J. & Wang, R.Z., 2019. "Experimental investigation on performance of a novel composite desiccant coated heat exchanger in summer and winter seasons," Energy, Elsevier, vol. 166(C), pages 506-518.

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