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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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    14. Chung, Jun Yeob & Park, Myeong Hyeon & Hong, Seong Ho & Baek, Jaehyun & Han, Changho & Lee, Sewon & Kang, Yong Tae & Kim, Yongchan, 2023. "Comparative performance evaluation of multi-objective optimized desiccant wheels coated with MIL-100 (Fe) and silica gel composite," Energy, Elsevier, vol. 283(C).
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    16. 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.
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    18. 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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