| Autor: |
Бошкова, І. Л., Волгушева, Н. В., Капауз, К. О., Гречановський, А. П. |
| Předmět: |
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| Zdroj: |
Refrigeration Engineering & Technology; 2024, Vol. 60 Issue 1, p1-8, 8p |
| Abstrakt: |
Regression equations for the temperature and moisture content of the wheat grain layer during microwave-convective drying were obtained. To derive the equations, we used data from studies of drying grain materials, compiled on the basis of the method of planning a full factorial experiment. The plans of a full factorial experiment are presented in the form of tables, taking into account the levels of factors and numbers of experiments. To reduce the influence of the external environment and uncontrolled factors within each series, the sequence of experiments was randomized. Randomization was carried out using a random number generator. The determining factors were the mass of the load (x1), drying time (x2), and the speed of blowing the layer with air (x3). The choice of factors is determined by their decisive influence on the drying process at a fixed power of the microwave source. For all experiments, the magnetron output power was 300 W. A table of the extended plan of a three-factor experiment is presented, which is general for obtaining experimental data on the average temperature and moisture content of a dense layer of grain 1.5 cm thick. Regression equations for temperature and moisture content are presented on a normalized factor scale with subsequent conversion to a natural scale. The results of estimating the error of the equations are presented. The response surfaces of temperature and moisture content from the three-factor influence were constructed, which make it possible to clearly illustrate the dependence of the drying parameters under study on the selected factors. An analysis of the influence of treatment duration, load mass, and air speed blown through the layer on the final values of temperature and moisture content is presented. The factors that most influence the kinetics of the drying process have been determined, and regimes that are unacceptable for drying seed grain have been established. The resulting equations satisfactorily describe the nature of changes in temperature and moisture content in a dense layer of grain during microwave-convective drying. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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