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Developments in solar drying using forced ventilation and solar regenerated desiccant materials

Author

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

Abstract

In many countries, grains are naturally sun dried in the field, resulting in large-scale spoilage. Purpose-built solar grain dryers are being introduced with some success, but to be effective, their performance must be carefully controlled to prevent cracking of grains, fungal growth and aflatoxin production during storage. This paper describes some of the performance aspects of an autonomous solar desiccant maize dryer developed for village use in Kenya. Since most commercial desiccants are expensive, a low cost solid desiccant was fabricated from bentonite clay and calcium chloride materials. This desiccant is capable of regeneration at 45°C, has high moisture sorption of 45% (dwb), significantly extends the drying process at night and reduces aflatoxin contamination of the grain. Laboratory and field testing took place to determine the drying performance and allow conclusions to be drawn. This showed the prototype dryer had the capability of drying 90kg of fresh maize from 38% (dwb) to 15% (dwb) within 24 hours.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:9:y:1996:i:1:p:686-689
    DOI: 10.1016/0960-1481(96)88378-9
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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. Sharma, Atul & Chen, C.R. & Vu Lan, Nguyen, 2009. "Solar-energy drying systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(6-7), pages 1185-1210, August.
    3. Tiwari, Sumit & Tiwari, G.N. & Al-Helal, I.M., 2016. "Development and recent trends in greenhouse dryer: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 1048-1064.
    4. 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.
    5. 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.
    6. 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.
    7. 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.
    8. 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.
    9. Shanmugam, V. & Natarajan, E., 2006. "Experimental investigation of forced convection and desiccant integrated solar dryer," Renewable Energy, Elsevier, vol. 31(8), pages 1239-1251.
    10. De Antonellis, Stefano & Joppolo, Cesare Maria & Molinaroli, Luca & Pasini, Alberto, 2012. "Simulation and energy efficiency analysis of desiccant wheel systems for drying processes," Energy, Elsevier, vol. 37(1), pages 336-345.
    11. 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.

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