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Novel, low cost CaCl2 based desiccants for solar crop drying applications

Author

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  • Thoruwa, T.F.N
  • Johnstone, C.M
  • Grant, A.D
  • Smith, J.E

Abstract

Drying with solar-heated air is satisfactory so long as the sun is shining. To continue this process through the night-time and periods of cloud cover, it is necessary to either store some of this energy in a thermal mass or incorporate desiccants within the drying system. This paper reports the results from studies undertaken to develop three low cost, solar regenerative clay–CaCl2 based solid desiccant materials; establish their moisture sorption and regeneration characteristics; assess their performance when compared with commercial desiccants; and integrate these within a low cost solar drying system for small-scale village-based crop drying. The moisture sorption and desorption performance of the desiccants were characterised in a Fison Environmental Cabinet at conditions of 85% (RH) and 25°C for 120 h for moisture sorption and 50°C and 20% (RH) for 8 h for regeneration. These conditions were representative of the environmental conditions monitored in the solar drying system. The bentonite–CaCl2 (type 1) desiccant gave a maximum moisture sorption of 45% dry weight basis (dwb) while bentonite–CaCl2 (type 2) and kaolinite–CaCl2 (type 3) solid desiccants each gave moisture sorption values of 30% (dwb). It was concluded from the moisture sorption and regeneration characteristics that their application in solar crop drying and air dehumidification is highly useful due to their low regeneration temperatures, sub 100°C.

Suggested Citation

  • Thoruwa, T.F.N & Johnstone, C.M & Grant, A.D & Smith, J.E, 2000. "Novel, low cost CaCl2 based desiccants for solar crop drying applications," Renewable Energy, Elsevier, vol. 19(4), pages 513-520.
    • Handle: RePEc:eee:renene:v:19:y:2000:i:4:p:513-520
    DOI: 10.1016/S0960-1481(99)00072-5
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    1. Thoruwa, T.F.N. & Smith, J.E. & Grant, A.D. & Johnstone, C.M., 1996. "Developments in solar drying using forced ventilation and solar regenerated desiccant materials," Renewable Energy, Elsevier, vol. 9(1), pages 686-689.
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    Cited by:

    1. Sultan, Muhammad & El-Sharkawy, Ibrahim I. & Miyazaki, Takahiko & Saha, Bidyut Baran & Koyama, Shigeru, 2015. "An overview of solid desiccant dehumidification and air conditioning systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 46(C), pages 16-29.
    2. Misha, S. & Mat, S. & Ruslan, M.H. & Sopian, K., 2012. "Review of solid/liquid desiccant in the drying applications and its regeneration methods," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(7), pages 4686-4707.
    3. VijayaVenkataRaman, S. & Iniyan, S. & Goic, Ranko, 2012. "A review of solar drying technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 2652-2670.
    4. Rambhad, Kishor S. & Walke, Pramod V. & Tidke, D.J., 2016. "Solid desiccant dehumidification and regeneration methods—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 59(C), pages 73-83.
    5. Yu, Qiongfen & Zhao, Huirong & Sun, Shengnan & Zhao, Hong & Li, Guoliang & Li, Ming & Wang, Yunfeng, 2019. "Characterization of MgCl2/AC composite adsorbent and its water vapor adsorption for solar drying system application," Renewable Energy, Elsevier, vol. 138(C), pages 1087-1095.
    6. Rashidi, Milad & Arabhosseini, Akbar & Samimi-Akhijahani, Hadi & Kermani, Ali M., 2021. "Acceleration the drying process of oleaster (Elaeagnus angustifolia L.) using reflectors and desiccant system in a solar drying system," Renewable Energy, Elsevier, vol. 171(C), pages 526-541.
    7. Sun, Shengnan & Yu, Qiongfen & Li, Ming & Zhao, Hong & Wu, Chunxiang, 2019. "Preparation of coffee-shell activated carbon and its application for water vapor adsorption," Renewable Energy, Elsevier, vol. 142(C), pages 11-19.
    8. Murthy, M.V. Ramana, 2009. "A review of new technologies, models and experimental investigations of solar driers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(4), pages 835-844, May.
    9. Dake, Rock Aymar & N’Tsoukpoe, Kokouvi Edem & Kuznik, Frédéric & Lèye, Babacar & Ouédraogo, Igor W.K., 2021. "A review on the use of sorption materials in solar dryers," Renewable Energy, Elsevier, vol. 175(C), pages 965-979.
    10. La, D. & Dai, Y.J. & Li, Y. & Wang, R.Z. & Ge, T.S., 2010. "Technical development of rotary desiccant dehumidification and air conditioning: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 130-147, January.
    11. Shanmugam, V. & Natarajan, E., 2006. "Experimental investigation of forced convection and desiccant integrated solar dryer," Renewable Energy, Elsevier, vol. 31(8), pages 1239-1251.
    12. N’Tsoukpoe, Kokouvi Edem & Yamegueu, Daniel & Bassole, Justin, 2014. "Solar sorption refrigeration in Africa," Renewable and Sustainable Energy Reviews, Elsevier, vol. 35(C), pages 318-335.
    13. Zheng, X. & Ge, T.S. & Wang, R.Z., 2014. "Recent progress on desiccant materials for solid desiccant cooling systems," Energy, Elsevier, vol. 74(C), pages 280-294.
    14. EL-Mesery, Hany S. & EL-Seesy, Ahmed I. & Hu, Zicheng & Li, Yang, 2022. "Recent developments in solar drying technology of food and agricultural products: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 157(C).

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