1. Marina Karić, Akademija strukovnih studija Šumadija (ASSŠ) – Odsek Trstenik, 37240 Trstenik, Serbia
2. Predrag Dašić, SaTCIP Publisher Ltd., 36610 Vrnjačka Banja i Visoka tehnička mašinska škola strukovnih studija (VTM, Serbia
3. Goran Mihajlović, Akademija strukovnih studija Šumadija (ASSŠ), Odsek Trstenik, Kragujevac, Srbija, Serbia
4. Jelena Erić Obućina, Visoka tehnička mašinska škola strukovnih studija Trstenik, Serbia
Drying kinetics was monitored by the gravimetric (direct) method, i.e. by measuring the change in mass of wet material during drying. The course of drying is defined by the type and properties of the material, the type of moisture present (free, bound), the method of drying and the drying conditions. When the working conditions defined by the state of the experiment have been reached in the chamber, the sample on the support is placed on the scale and the measurement begins. In defined time intervals (from 1 hour), the mass of the wet sample is read. For each time interval, the moisture content of the sample can be calculated, provided that the initial humidity is known for all experiments defined by the experiment plan and that the dependence of the moisture content on time is drawn - a graphic display of the drying curve and the drying speed curves. The data from the graph served as the basis for approximating the drying curves of apples of the ”red delicious” variety with a mathematical model - polynomial regression. A regression model that contains one dependent (ws or dws/d) and one independent variable () is a simple regression model.
Based on experimental data, the paper analyzes the convective drying of an apple variety in a laboratory batch convective-condensation dryer of its own construction. The influence of process parameters on the drying kinetics of the widespread variety ”red delicious”, cut into rings, initial relative humidity around 87%, dried to the final around 7.5-8.5%, is being investigated. The drying kinetics is displayed as a drying curve and a drying speed curve. The drying curve describes the change in moisture content of the material during drying (time), and the drying speed curve describes the change in drying speed over time. The drying speed is observed under constant conditions and is defined by the amount of water that evaporates from its surface in a unit of time, whereby constant conditions mean: temperature t, relative humidity and air flow speed .
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Datum:
18.08.2026.
Contemporary Materials 2026 - Savremeni Materijali
