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Empirical correlations for drying kinetics of some fruits and vegetables

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  • El-Sebaii, A.A.
  • Aboul-Enein, S.
  • Ramadan, M.R.I.
  • El-Gohary, H.G.

Abstract

An indirect type natural convection locally made solar dryer, consisting of a flat-plate solar air heater connected to a drying chamber, has been investigated experimentally and theoretically. The system is used for drying fruits and vegetables such as seedless grapes, figs, green peas, tomatoes and onions. The experimental data are used to calculate the drying constants k for the selected products. The obtained values of k are then correlated with the drying product temperature Tdp. Linear correlations between k and Tdp are found to satisfactorily describe the drying curves of the materials under study. Furthermore, the characteristics constants c and n of Henderson’s equation are determined for the selected crops using the experimentally measured relative humidity of the drying air. A simple mathematical model is presented for the drying chamber based on the energy and mass balance equations and employing the proposed correlations for k as well as the values of the constants c and n. Numerical calculations are performed on typical summer and winter days in Tanta. Comparisons between experimental and theoretical results showed that good agreement has been achieved. The effect of the mass of the drying product mdp on the dryer performance is also investigated by computer simulation.

Suggested Citation

  • El-Sebaii, A.A. & Aboul-Enein, S. & Ramadan, M.R.I. & El-Gohary, H.G., 2002. "Empirical correlations for drying kinetics of some fruits and vegetables," Energy, Elsevier, vol. 27(9), pages 845-859.
    • Handle: RePEc:eee:energy:v:27:y:2002:i:9:p:845-859
    DOI: 10.1016/S0360-5442(02)00021-X
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    1. Aboul-Enein, S. & El-Sebaii, A.A. & Ramadan, M.R.I. & El-Gohary, H.G., 2000. "Parametric study of a solar air heater with and without thermal storage for solar drying applications," Renewable Energy, Elsevier, vol. 21(3), pages 505-522.
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    2. Biswal, Pratibha & Basak, Tanmay, 2014. "Bejan's heatlines and numerical visualization of convective heat flow in differentially heated enclosures with concave/convex side walls," Energy, Elsevier, vol. 64(C), pages 69-94.
    3. Md Imran H. Khan & C. P. Batuwatta-Gamage & M. A. Karim & YuanTong Gu, 2022. "Fundamental Understanding of Heat and Mass Transfer Processes for Physics-Informed Machine Learning-Based Drying Modelling," Energies, MDPI, vol. 15(24), pages 1-27, December.
    4. 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.
    5. Fuqiang Qiu & Baoguo Li & Taoping Xu & Dugui He, 2022. "Drying behavior and mathematical modeling of Tenebrio molitor using a closed system heat pump dryer [Evaluation of Tenebrio molitor larvae as an alternative food source]," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 17, pages 841-849.
    6. Ho, C.D. & Yeh, C.W. & Hsieh, S.M., 2005. "Improvement in device performance of multi-pass flat-plate solar air heaters with external recycle," Renewable Energy, Elsevier, vol. 30(10), pages 1601-1621.
    7. Hamdi, Ilhem & Kooli, Sami & Elkhadraoui, Aymen & Azaizia, Zaineb & Abdelhamid, Fadhel & Guizani, Amenallah, 2018. "Experimental study and numerical modeling for drying grapes under solar greenhouse," Renewable Energy, Elsevier, vol. 127(C), pages 936-946.
    8. Shanmugam, V. & Natarajan, E., 2006. "Experimental investigation of forced convection and desiccant integrated solar dryer," Renewable Energy, Elsevier, vol. 31(8), pages 1239-1251.
    9. 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.
    10. Anandalakshmi, R. & Kaluri, Ram Satish & Basak, Tanmay, 2011. "Heatline based thermal management for natural convection within right-angled porous triangular enclosures with various thermal conditions of walls," Energy, Elsevier, vol. 36(8), pages 4879-4896.
    11. Irene Montero & María Teresa Miranda & Francisco José Sepúlveda & José Ignacio Arranz & Carmen Victoria Rojas & Sergio Nogales, 2015. "Solar Dryer Application for Olive Oil Mill Wastes," Energies, MDPI, vol. 8(12), pages 1-15, December.
    12. Ho, C.D. & Chen, T.C., 2006. "The recycle effect on the collector efficiency improvement of double-pass sheet-and-tube solar water heaters with external recycle," Renewable Energy, Elsevier, vol. 31(7), pages 953-970.
    13. Wengang Hao & Shuonan Liu & Baoqi Mi & Yanhua Lai, 2020. "Mathematical Modeling and Performance Analysis of a New Hybrid Solar Dryer of Lemon Slices for Controlling Drying Temperature," Energies, MDPI, vol. 13(2), pages 1-23, January.
    14. Singh, S.P. & Jairaj, K.S. & Srikant, K., 2012. "Universal drying rate constant of seedless grapes: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(8), pages 6295-6302.

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