Drying Characteristics and Mathematical Modeling of Without Pretreatment and Pretreatment Zucchini (Cucurbita Pepo L.) Slices in a Solar Tunnel Dryer

With/without pretreated zucchini samples were dried in a solar tunnel dryer to determine drying characteristic and modelling. Solar irradiation at ambient, drying air temperature and air velocity at specific intervals in various parts of the dryer were measured. In the study, it was investigated how pretreatment of zucchini affected the drying time, moisture ratio and drying rate of it in solar tunnel dryer. In addition, the data on the drying process were applied to eight different mathematical models (Newton, Page, Henderson and pabis, Logarithmic, Diffusion, Midilli et al., Alibas, Logistic Equation Models). The performance levels of the models compared according to R, χ, besides RMSE between moisture ratios that were observed and predicted. Furthermore, considering all selected models, Midilli et al. and Alibaş model equations gave the highest R, the lowest χ and RMSE values and were found to reveal the ratio of drying in a satisfactory way for all the methods of drying.

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