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Experimental and modelling performances of a roof-integrated solar drying system for drying herbs and spices

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  • Janjai, S.
  • Srisittipokakun, N.
  • Bala, B.K.

Abstract

This paper presents experimental performance of solar drying of rosella flower and chili using roof-integrated solar dryer and also presents modelling of the roof-integrated solar dryer for drying of chili. Field-level tests for deep bed drying of rosella flower and chili demonstrated that drying in the roof-integrated solar dryer results in significant reduction in drying time compared to the traditional sun drying method and the dry product is a quality dry product compared to the quality products in the markets. The payback period of the roof-integrated solar dryer is about 5 years. To simulate the performance of the roof-integrated solar dryer for drying herbs and spices using hot air from roof-integrated solar collectors, two sets of equations were developed. The first set of equations was solved implicitly and the second set of equations was solved explicitly using finite difference technique. The simulated air temperatures at the collector outlet agreed well with the observed air temperatures. Good agreement was also found between experimental and simulated moisture contents.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:33:y:2008:i:1:p:91-103
    DOI: 10.1016/j.energy.2007.08.009
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    References listed on IDEAS

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    7. 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.
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    12. Amer, Baher M.A. & Gottschalk, Klaus & Hossain, M.A., 2018. "Integrated hybrid solar drying system and its drying kinetics of chamomile," Renewable Energy, Elsevier, vol. 121(C), pages 539-547.
    13. 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.
    14. 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.
    15. Dissa, A.O. & Bathiebo, D.J. & Desmorieux, H. & Coulibaly, O. & Koulidiati, J., 2011. "Experimental characterisation and modelling of thin layer direct solar drying of Amelie and Brooks mangoes," Energy, Elsevier, vol. 36(5), pages 2517-2527.
    16. Kareem, M.W. & Habib, Khairul & Ruslan, M.H. & Saha, Bidyut Baran, 2017. "Thermal performance study of a multi-pass solar air heating collector system for drying of Roselle (Hibiscus sabdariffa)," Renewable Energy, Elsevier, vol. 113(C), pages 281-292.
    17. Román, Franz & Nagle, Marcus & Leis, Hermann & Janjai, Serm & Mahayothee, Busarakorn & Haewsungcharoen, Methinee & Müller, Joachim, 2009. "Potential of roof-integrated solar collectors for preheating air at drying facilities in Northern Thailand," Renewable Energy, Elsevier, vol. 34(7), pages 1661-1667.
    18. Rabha, D.K. & Muthukumar, P. & Somayaji, C., 2017. "Experimental investigation of thin layer drying kinetics of ghost chilli pepper (Capsicum Chinense Jacq.) dried in a forced convection solar tunnel dryer," Renewable Energy, Elsevier, vol. 105(C), pages 583-589.
    19. Kareem, M.W. & Habib, Khairul & Sopian, K. & Ruslan, M.H., 2017. "Multi-pass solar air heating collector system for drying of screw-pine leaf (Pandanus tectorius)," Renewable Energy, Elsevier, vol. 112(C), pages 413-424.

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