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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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    6. 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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    9. Abubakar, S. & Umaru, S. & Kaisan, M.U. & Umar, U.A. & Ashok, B. & Nanthagopal, K., 2018. "Development and performance comparison of mixed-mode solar crop dryers with and without thermal storage," Renewable Energy, Elsevier, vol. 128(PA), pages 285-298.
    10. 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.
    11. El Hage, Hicham & Herez, Amal & Ramadan, Mohamad & Bazzi, Hassan & Khaled, Mahmoud, 2018. "An investigation on solar drying: A review with economic and environmental assessment," Energy, Elsevier, vol. 157(C), pages 815-829.
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