Potato thin layer convective dehydration model and energy efficiency estimation

Abstract

The dehydration parameters (temperature, thickness, and mass load) statistically significantly (p<0.05) affect the thin-layer convective dehydration of potato slices. The slices with thicknesses of 3, 5, and 8 mm were dehydrated as monolayers at different temperatures (30, 50, and 70 °C) and mass load (1.00, 0.63, and 0.38 kg m-2). The results showed that the shortest dehydration time (183 minutes), the smallest energy consumption (0.176 kWh), and the smallest emission of carbon dioxide (0.17 kg) had the dehydration model of potato slices with a 3 mm thickness, 0.38 kg m-2 mass load, dehydrated on the temperature of 70 °C. Dehydration of potato slices of 8 mm slice thickness dehydrated at 70 °C, with 0.38 kg m-2 mass load, showed the highest resistance to mass transfer (the maximum effective moisture diffusivity 2.3761 × 10-7 ± 4.45646 × 10-9 m2 s−1) and the minimum activation energy (27.02 kJ mol-1). Data obtained from these mathematical models could predict and optimize the thin layer dehydration of potato slices, with a dominant influence of temperature and potato slice thickness parameters as variables.

A Comparative Analysis of Thin-Layer Microwave and Microwave/Convective Dehydration of Chokeberry

“…The weight of the trays was measured at intervals of 5 min for MCD and 10 min for MD (in triplicates). The drying kinetic was based on mass losses of chokeberries [ 17 , 18 ].…”

“…Fick’s second low-diffusion model was used to describe the moisture transport phenomena from chokeberries, and the effective moisture diffusivity (D eff ) was determined. Equations (3) and (4) define the theoretical calculation model based on the product geometry (sphere is the appropriate model for the berries) [ 7 , 17 ]: …”

“…Determination of energy consumption (E) of both MW and MW/C was measured by using Prosto PM 001 (230 V, 50 Hz, 0–16 A, 2–3680 W, 0–9999 kWh, −10 °C to +40 °C, ≤85% of relative humidity, the altitude of use max 2000 m). The E was mathematically correlated with the CO 2 emission during the MW and MW·C −1 (1 kWh of E releases 0.998 kg CO 2 [ 17 ].…”

“…To study the differences between groups, post hoc Tukey HSD test and the second-order polynomial models Microsoft Excel (ver. 2016, Microsoft Corporation, Redmond, WA, USA) ( p < 0.05) were used [ 17 ]. A one-way analysis of variance (ANOVA) was used to confirm the significance of variations in the quality features of the examined chokeberries.…”

High-Temperature Treatment of Grain Crops

“…Такая обработка снижает количество патогенных микроорганизмов, в том числе кишечную палочку [6]. ИК-нагрев может быть использован для сушки материала [11,12]. Одним из недостатков такой технологии является повреждение молекулярного содержимого сырья.…”