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A solar air heater with composite–absorber systems for food dehydration

Author

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  • Madhlopa, A
  • Jones, S.A
  • Kalenga Saka, J.D

Abstract

Development of appropriate technologies for conversion of solar radiation to thermal energy is essential for food preservation. A solar air heater, comprising two absorber systems in a single flat-plate collector, was designed on the principles of psychrometry. The heater was integrated to a drying chamber for food dehydration. This collector design offered flexibility in manual adjustment of the thermal characteristics of the solar dryer. The performance of the dryer was evaluated by drying fresh samples of mango (Mangifera indicus). Both fresh and dried mango samples were analysed for moisture content (MC), pH and ascorbic acid. During the dehydration period, meteorological measurements were made. The air heater converted up to 21.3% of solar radiation to thermal power, and raised the temperature of the drying air from about 31.7 °C to 40.1 °C around noon. The dryer reduced the MC of sliced fresh mangoes from about 85% (w/w) to 13% (w/w) on wet basis, and retained 74% of ascorbic acid. It was found that the dryer was suitable for preservation of mangoes and other fresh foods.

Suggested Citation

  • Madhlopa, A & Jones, S.A & Kalenga Saka, J.D, 2002. "A solar air heater with composite–absorber systems for food dehydration," Renewable Energy, Elsevier, vol. 27(1), pages 27-37.
    • Handle: RePEc:eee:renene:v:27:y:2002:i:1:p:27-37
    DOI: 10.1016/S0960-1481(01)00174-4
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    Citations

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    Cited by:

    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.
    2. Kabeel, A.E. & Hamed, Mofreh H. & Omara, Z.M. & Kandeal, A.W., 2017. "Solar air heaters: Design configurations, improvement methods and applications – A detailed review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 70(C), pages 1189-1206.
    3. Chen, Wei & Qu, Man, 2014. "Analysis of the heat transfer and airflow in solar chimney drying system with porous absorber," Renewable Energy, Elsevier, vol. 63(C), pages 511-518.
    4. Murthy, M.V. Ramana, 2009. "A review of new technologies, models and experimental investigations of solar driers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(4), pages 835-844, May.
    5. Razak, A.A. & Majid, Z.A.A. & Azmi, W.H. & Ruslan, M.H. & Choobchian, Sh. & Najafi, G. & Sopian, K., 2016. "Review on matrix thermal absorber designs for solar air collector," Renewable and Sustainable Energy Reviews, Elsevier, vol. 64(C), pages 682-693.
    6. Kumar, Mahesh & Sansaniwal, Sunil Kumar & Khatak, Pankaj, 2016. "Progress in solar dryers for drying various commodities," Renewable and Sustainable Energy Reviews, Elsevier, vol. 55(C), pages 346-360.
    7. Tunde-Akintunde, T.Y., 2011. "Mathematical modeling of sun and solar drying of chilli pepper," Renewable Energy, Elsevier, vol. 36(8), pages 2139-2145.
    8. Cresencio P. Genobiagon Jr & Feliciano B. Alagao, 2019. "Performance Of Low-Cost Dual Circuit Solar Assisted Cabinet Dryer For Green Banana," Journal of Mechanical Engineering Research & Developments (JMERD), Zibeline International Publishing, vol. 42(1), pages 42-45, January.
    9. Dissa, A.O. & Bathiebo, J. & Kam, S. & Savadogo, P.W. & Desmorieux, H. & Koulidiati, J., 2009. "Modelling and experimental validation of thin layer indirect solar drying of mango slices," Renewable Energy, Elsevier, vol. 34(4), pages 1000-1008.
    10. 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.

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