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Experimental investigation of the drying characteristics of a mixed mode natural convection solar crop dryer with back up heater

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  • Sekyere, C.K.K.
  • Forson, F.K.
  • Adam, F.W.

Abstract

A mixed mode natural convection solar crop dryer with a backup heater was designed and constructed from locally available materials and used to dry freshly prepared pineapples under four drying Scenarios for drying to correspond to specified drying periods for four typical seasons in Ghana. The experiments were devised for the material moisture content to be monitored continuously till the desired moisture content of between +106% and 184% (d.b) was achieved. In solar heating mode of operation, results show that the thermal mass was capable of storing part of the absorbed solar energy but the quantities involved are insufficient to sustain night drying. It was possible to dry a batch of pineapples in each mode of operation. The dryer reduced the moisture content of pineapple slices from about; 924% to 106% in 19 h; 1049% to 184% in 10 h; 912% to 155% in 7 h; and 1049% to 144% (d.b) in 23 h, for drying in Scenarios 1, 2, 3 and 4, respectively. The average moisture pickup efficiency values obtained were 27%, 24%, 11%, and 32% for drying in Scenarios 1, 2, 3, and 4, respectively.

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  • Sekyere, C.K.K. & Forson, F.K. & Adam, F.W., 2016. "Experimental investigation of the drying characteristics of a mixed mode natural convection solar crop dryer with back up heater," Renewable Energy, Elsevier, vol. 92(C), pages 532-542.
    • Handle: RePEc:eee:renene:v:92:y:2016:i:c:p:532-542
    DOI: 10.1016/j.renene.2016.02.020
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    References listed on IDEAS

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    1. Forson, F.K. & Nazha, M.A.A. & Akuffo, F.O. & Rajakaruna, H., 2007. "Design of mixed-mode natural convection solar crop dryers: Application of principles and rules of thumb," Renewable Energy, Elsevier, vol. 32(14), pages 2306-2319.
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    2. Kishk, Sameh S. & ElGamal, Ramadan A. & ElMasry, Gamal M., 2019. "Effectiveness of recyclable aluminum cans in fabricating an efficient solar collector for drying agricultural products," Renewable Energy, Elsevier, vol. 133(C), pages 307-316.
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    6. Lakshmi, D.V.N. & Muthukumar, P. & Layek, Apurba & Nayak, Prakash Kumar, 2018. "Drying kinetics and quality analysis of black turmeric (Curcuma caesia) drying in a mixed mode forced convection solar dryer integrated with thermal energy storage," Renewable Energy, Elsevier, vol. 120(C), pages 23-34.
    7. Das, Debayan & Lukose, Leo & Basak, Tanmay, 2018. "Role of multiple solar heaters along the walls for the thermal management during natural convection in square and triangular cavities," Renewable Energy, Elsevier, vol. 121(C), pages 205-229.
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    9. Zoukit, Ahmed & El Ferouali, Hicham & Salhi, Issam & Doubabi, Said & Abdenouri, Naji, 2019. "Takagi Sugeno fuzzy modeling applied to an indirect solar dryer operated in both natural and forced convection," Renewable Energy, Elsevier, vol. 133(C), pages 849-860.
    10. ElGamal, Ramadan & Kishk, Sameh & Al-Rejaie, Salim & ElMasry, Gamal, 2021. "Incorporation of a solar tracking system for enhancing the performance of solar air heaters in drying apple slices," Renewable Energy, Elsevier, vol. 167(C), pages 676-684.
    11. 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).
    12. Karthikeyan, A.K. & Murugavelh, S., 2018. "Thin layer drying kinetics and exergy analysis of turmeric (Curcuma longa) in a mixed mode forced convection solar tunnel dryer," Renewable Energy, Elsevier, vol. 128(PA), pages 305-312.

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