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Type of publication: Straipsnis / Article
Author(s): Górnicki, Krzysztof;Kaleta, Agnieszka;Choińska, Aneta
Title: Extension of Weibull model for describing of dried apple rehydration
Is part of: Rural development 2017 : bioeconomy challenges : proceedings of the 8th international scientific conference, 23-24 November, 2017, Aleksandras Stulginskis University, 2017, p. 47-51
Date: 2017
Keywords: Apple;Rehydration;Weibull model
Abstract: Sample of Ligol variety apples (slices of 3 and 10 mm thickness and cubes of 10 mm thickness) were dried using following methods: natural convection (drying air velocity amounted to 0.01 m/s), forced convection (0.5 and 2 m/s), fluidized bed drying (6 m/s). The drying air temperature was kept at 50, 60, and 70ºC. The dried apples samples were rehydrated in distilled water at 20, 45, 70, and 95ºC. The Weibull model given for describing time dependence of the moisture content change was fitted to experimental data and model parameters were determined by multiple regression analysis. The variation of model parameters with characteristic particle dimension (L), drying air velocity (v), drying air temperature (td), and rehydration temperature (tr) described as multiplication type. By using these verification of parameters, extended Weibull model for describing combine effects of L, v, td, tr, and drying time was derived and the parameters of the model were also determined by multiple regression analysis. The accuracies of both models were measured using the determination coefficient (R2 ), mean bias error (MBE), root mean square error (RMSE), reduced chi-square ( χ2 ), and t-statistic method. The Weibull model (R2=0.8319-0.9957, MBE=-0.0044-0.0110, RMSE=0.0189-0.1248, χ 2=0.0004-0.0180, and t-stat=0.0149-0.2875) and the extended Weibull model (R2=0.9130-0.9948, MBE=-0.0209-0.0377, RMSE=0.0230-0.0719, χ 2=0.0007- 0.0057, and t-stat=0.0389-1.2214) described the rehydration characteristics of dried apple satisfactorily. The extended model by taking into account the effect of L, v, td, and tr on its parameters can be considered as more general one.
Appears in Collections:Rural Development 2017: Bioeconomy Challenges: Proceedings of the 8th International Scientific Conference

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