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A large-scale solar greenhouse dryer using polycarbonate cover: Modeling and testing in a tropical environment of Lao People’s Democratic Republic

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  • Janjai, Serm
  • Intawee, Poolsak
  • Kaewkiew, Jinda
  • Sritus, Chanoke
  • Khamvongsa, Vathsana

Abstract

A large-scale solar greenhouse dryer with a loading capacity of 1000 kg of fruits or vegetables has been developed and tested at field levels. The dryer has a parabolic shape and the dryer is covered with polycarbonate sheets. The base of the dryer is a black concrete floor with an area of 7.5 × 20.0 m2. Nine DC fans powered by three 50-W solar cell modules are used to ventilate the dryer. The dryer was installed at Champasak (15.13 °N, 105.79 °E) in Lao People’s Democratic Republic (Lao PDR). It is routinely used to dry chilli, banana and coffee. To assess the experimental performances of the dryer, air temperature, air relative humidity and product moisture contents were measured. One thousand kilograms of banana with the initial moisture content of 68% (wb) was dried within 5 days, compared to 7 days required for natural sun drying with the same weather conditions. Also three hundred kilograms of chilli with the initial moisture content of 75% (wb) was dried within 3 days while the natural sun drying needed 5 days. Two hundred kilograms of coffee with the initial moisture content of 52% (wb) was dried within 2 days as compared to 4 days required for natural sun drying. The chilli, coffee and banana dried in this dryer were completely protected from insects, animals and rain. Furthermore, good quality of dried products was obtained. The payback period of the dryer is estimated to be 2.5 years. A system of partial differential equations describing heat and moisture transfer during drying of chilli, coffee and banana in the greenhouse dryer was developed. These equations were solved by using the finite different method. The simulated results agree well with the experimental data. This model can be used to provide the design data for this type of dryer in other locations.

Suggested Citation

  • Janjai, Serm & Intawee, Poolsak & Kaewkiew, Jinda & Sritus, Chanoke & Khamvongsa, Vathsana, 2011. "A large-scale solar greenhouse dryer using polycarbonate cover: Modeling and testing in a tropical environment of Lao People’s Democratic Republic," Renewable Energy, Elsevier, vol. 36(3), pages 1053-1062.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:3:p:1053-1062
    DOI: 10.1016/j.renene.2010.09.008
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    1. Fudholi, A. & Sopian, K. & Ruslan, M.H. & Alghoul, M.A. & Sulaiman, M.Y., 2010. "Review of solar dryers for agricultural and marine products," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 1-30, January.
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    Cited by:

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    8. Prakash, Om & Kumar, Anil, 2014. "Solar greenhouse drying: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 29(C), pages 905-910.
    9. Nabnean, S. & Janjai, S. & Thepa, S. & Sudaprasert, K. & Songprakorp, R. & Bala, B.K., 2016. "Experimental performance of a new design of solar dryer for drying osmotically dehydrated cherry tomatoes," Renewable Energy, Elsevier, vol. 94(C), pages 147-156.
    10. Patil, Rajendra & Gawande, Rupesh, 2016. "A review on solar tunnel greenhouse drying system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 196-214.
    11. 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.
    12. Fudholi, Ahmad & Sopian, Kamaruzzaman & Bakhtyar, B. & Gabbasa, Mohamed & Othman, Mohd Yusof & Ruslan, Mohd Hafidz, 2015. "Review of solar drying systems with air based solar collectors in Malaysia," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 1191-1204.
    13. Abdul Ghani Olabi & Nabila Shehata & Hussein M. Maghrabie & Lobna A. Heikal & Mohammad Ali Abdelkareem & Shek Mohammod Atiqure Rahman & Sheikh Khaleduzzaman Shah & Enas Taha Sayed, 2022. "Progress in Solar Thermal Systems and Their Role in Achieving the Sustainable Development Goals," Energies, MDPI, vol. 15(24), pages 1-31, December.
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    16. ELkhadraoui, Aymen & Kooli, Sami & Hamdi, Ilhem & Farhat, Abdelhamid, 2015. "Experimental investigation and economic evaluation of a new mixed-mode solar greenhouse dryer for drying of red pepper and grape," Renewable Energy, Elsevier, vol. 77(C), pages 1-8.
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    18. Chauhan, Prashant Singh & Kumar, Anil & Nuntadusit, Chayut & Banout, Jan, 2018. "Thermal modeling and drying kinetics of bitter gourd flakes drying in modified greenhouse dryer," Renewable Energy, Elsevier, vol. 118(C), pages 799-813.

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