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Optimization of natural-convection, solar drying systems

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  • Bala, B.K.
  • Woods, J.L.

Abstract

We present a technique for optimization of natural-convection, solar driers. The physical simulation is combined with a cost prediction and a search technique, which finds the constrained minimum of total cost per unit moisture removal. The optimum design for typical Bangladesh conditions is a relatively long collector, a thin grain bed and negligible chimney height. Sensitivity analyses have shown that the design geometry is not very sensitive to material or fixed costs but grain capacity has some effect. Turning the grain has almost no effect on drying but greatly reduces over-drying at the bottom of the bed.

Suggested Citation

  • Bala, B.K. & Woods, J.L., 1995. "Optimization of natural-convection, solar drying systems," Energy, Elsevier, vol. 20(4), pages 285-294.
    • Handle: RePEc:eee:energy:v:20:y:1995:i:4:p:285-294
    DOI: 10.1016/0360-5442(94)00083-F
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    Citations

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    Cited by:

    1. Basak, Tanmay & Anandalakshmi, R. & Kumar, Pushpendra & Roy, S., 2012. "Entropy generation vs energy flow due to natural convection in a trapezoidal cavity with isothermal and non-isothermal hot bottom wall," Energy, Elsevier, vol. 37(1), pages 514-532.
    2. Fudholi, Ahmad & Sopian, Kamaruzzaman & Gabbasa, Mohamed & Bakhtyar, B. & Yahya, M. & Ruslan, Mohd Hafidz & Mat, Sohif, 2015. "Techno-economic of solar drying systems with water based solar collectors in Malaysia: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 809-820.
    3. Hossain, M.A. & Woods, J.L. & Bala, B.K., 2005. "Optimisation of solar tunnel drier for drying of chilli without color loss," Renewable Energy, Elsevier, vol. 30(5), pages 729-742.
    4. Smitabhindu, R. & Janjai, S. & Chankong, V., 2008. "Optimization of a solar-assisted drying system for drying bananas," Renewable Energy, Elsevier, vol. 33(7), pages 1523-1531.
    5. Anand, Sumeet & Mishra, Dipti Prasad & Sarangi, Shailesh Kumar, 2020. "CFD supported performance analysis of an innovative biomass dryer," Renewable Energy, Elsevier, vol. 159(C), pages 860-872.
    6. Kaluri, Ram Satish & Basak, Tanmay, 2010. "Analysis of distributed thermal management policy for energy-efficient processing of materials by natural convection," Energy, Elsevier, vol. 35(12), pages 5093-5107.
    7. Bala, B.K. & Mondol, M.R.A. & Biswas, B.K. & Das Chowdury, B.L. & Janjai, S., 2003. "Solar drying of pineapple using solar tunnel drier," Renewable Energy, Elsevier, vol. 28(2), pages 183-190.
    8. Simate, I.N, 2003. "Optimization of mixed-mode and indirect-mode natural convection solar dryers," Renewable Energy, Elsevier, vol. 28(3), pages 435-453.
    9. Mustayen, A.G.M.B. & Mekhilef, S. & Saidur, R., 2014. "Performance study of different solar dryers: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 34(C), pages 463-470.
    10. Janjai, S. & Srisittipokakun, N. & Bala, B.K., 2008. "Experimental and modelling performances of a roof-integrated solar drying system for drying herbs and spices," Energy, Elsevier, vol. 33(1), pages 91-103.

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