SOLAR DRYER PERFORMANCE STUDY OF SOME CROPS (MINT, OKRA AND GRAPES) II - COMPATIBILITY OF SOLAR DRYING BEHAVIOR WITH MATHEMATICAL MODELS FOR THIN LAYER

Hassan, Mona M. A.

doi:10.21608/mjae.2015.98708

SOLAR DRYER PERFORMANCE STUDY OF SOME CROPS (MINT, OKRA AND GRAPES) II - COMPATIBILITY OF SOLAR DRYING BEHAVIOR WITH MATHEMATICAL MODELS FOR THIN LAYER

Document Type : Original Article

Author

Mona M. A. Hassan

Associate. Prof. of Agric. Eng., Fac. of Agric., Zagazig Univ., Egypt.

10.21608/mjae.2015.98708

Abstract

In this work, the sun drying behavior of some plants as mint, okra and grapes was investigated. Drying experiments were conducted in Zagazig, Sharkia. During the drying experiments, the solar radiation ranged from 95 to 900 W/m², the air velocity from 5 to 12 m/s. The solar radiation energy is maximum at midday and minimum at evening in the day of experiment. Moreover, the temperature of ambient air ranged from 36 to 39 ^oc. Mean relative humidity just above surface of the plants varied between 23 % and 29 %. The drying data were fitted to six different mathematical models. Among the models, the results of statistical analyses undertaken on these models for mint, okra and grapes are given in tables 2, 3 and 4, respectively. The models were evaluated based on X², MBE and RMSE. For mint leaves, the Modified Page (I) model was the best descriptive model, it was determined that X²= 2.52x10^-3, MBE=0.0188 and RMSE = 0.77611. For okra, the Newton model was the best descriptive model, it was determined that X²= 3.47x10^-3, MBE=-0.012 and RMSE = 0.051. For grapes, the Wang and Singh model was the best descriptive model, it was determined that X²= 1.1x10-3, MBE=-0.02823 and RMSE = 0.116417.

Keywords

References

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