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Feasibility study on power ultrasound for regeneration of silica gel--A potential desiccant used in air-conditioning system

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  • Yao, Ye
  • Zhang, Weijiang
  • Liu, Shiqing

Abstract

A new regeneration method using power ultrasound was put forward to overcome the limitations of silica gel in air-conditioning applications, such as high regeneration temperature and low regeneration efficiency. The technical feasibility of the new method was validated experimentally and demonstrated in detail from different sides. The experiments were performed under different regeneration temperatures, i.e. 45 °C, 55 °C, 65 °C and 75 °C. The power and frequency of ultrasound applied in this experimental study was set as 40 W and 26 kHz, respectively. The three indicators, including the regeneration degree (RD), enhanced rate of regeneration (ER) and energy-saving rate (ESR), were suggested to evaluate the effect of power ultrasound in the regeneration. The Crank's diffusion model was used for the calculation of the moisture diffusivity in silica gel, and the Arrhenius equation for the determination of energy activation of moisture desorption on silica gel. The analysis results prove that the introduction of high-intensity ultrasound to the regeneration of silica gel can help to improve the regeneration efficiency and reduce regeneration energy. The benefits should owe to the special [`]heating effect' and [`]micro-vibration effect' caused by power ultrasound that can enhance the moisture diffusivity in silica gel and lower the activation energy of moisture desorption on silica gel.

Suggested Citation

  • Yao, Ye & Zhang, Weijiang & Liu, Shiqing, 2009. "Feasibility study on power ultrasound for regeneration of silica gel--A potential desiccant used in air-conditioning system," Applied Energy, Elsevier, vol. 86(11), pages 2394-2400, November.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:11:p:2394-2400
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    Citations

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    Cited by:

    1. Fan, Hongming & Shao, Shuangquan & Tian, Changqing, 2014. "Performance investigation on a multi-unit heat pump for simultaneous temperature and humidity control," Applied Energy, Elsevier, vol. 113(C), pages 883-890.
    2. Xiong, Z.Q. & Dai, Y.J. & Wang, R.Z., 2010. "Development of a novel two-stage liquid desiccant dehumidification system assisted by CaCl2 solution using exergy analysis method," Applied Energy, Elsevier, vol. 87(5), pages 1495-1504, May.
    3. Angrisani, Giovanni & Capozzoli, Alfonso & Minichiello, Francesco & Roselli, Carlo & Sasso, Maurizio, 2011. "Desiccant wheel regenerated by thermal energy from a microcogenerator: Experimental assessment of the performances," Applied Energy, Elsevier, vol. 88(4), pages 1354-1365, April.
    4. Zhang, Guiying & Tian, Changqing & Shao, Shuangquan, 2014. "Experimental investigation on adsorption and electro-osmosis regeneration of macroporous silica gel desiccant," Applied Energy, Elsevier, vol. 136(C), pages 1010-1017.
    5. Qi, Ronghui & Tian, Changqing & Shao, Shuangquan, 2010. "Experimental investigation on possibility of electro-osmotic regeneration for solid desiccant," Applied Energy, Elsevier, vol. 87(7), pages 2266-2272, July.
    6. Qi, Ronghui & Tian, Changqing & Shao, Shuangquan & Tang, Mingsheng & Lu, Lin, 2011. "Experimental investigation on performance improvement of electro-osmotic regeneration for solid desiccant," Applied Energy, Elsevier, vol. 88(8), pages 2816-2823, August.
    7. Bhattacharya, Madhuchhanda & Basak, Tanmay, 2013. "A theoretical study on the use of microwaves in reducing energy consumption for an endothermic reaction: Role of metal coated bounding surface," Energy, Elsevier, vol. 55(C), pages 278-294.
    8. Ranjbaran, M. & Zare, D., 2013. "Simulation of energetic- and exergetic performance of microwave-assisted fluidized bed drying of soybeans," Energy, Elsevier, vol. 59(C), pages 484-493.
    9. Yon, Hao Ren & Cai, Wenjian & Wang, Youyi & Shen, Suping, 2018. "Performance investigation on a novel liquid desiccant regeneration system operating in vacuum condition," Applied Energy, Elsevier, vol. 211(C), pages 249-258.
    10. Liu, Xiaoli & Qu, Ming & Liu, Xiaobing & Wang, Lingshi, 2019. "Membrane-based liquid desiccant air dehumidification: A comprehensive review on materials, components, systems and performances," Renewable and Sustainable Energy Reviews, Elsevier, vol. 110(C), pages 444-466.
    11. Acevedo, Luis & Usón, Sergio & Uche, Javier, 2015. "Local exergy cost analysis of microwave heating systems," Energy, Elsevier, vol. 80(C), pages 437-451.

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