Перегляд за Автор "Chepeliuk, Oleksandr"

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Determination of rational modes of pumpkin seeds drying
(2018) Pazyuk, Vаdym; Petrova, Zhanna; Chepeliuk, Oleksandr
Pumpkin seeds are an easily accessible source of protein and other useful substances. A purpose is to determine a rational mode of its drying, which ensures high germinability of the seeds. The physical and mechanical properties of pumpkin seeds «Stofuntovyi» of Ukrainian selection with a humidity of 0, 6, 16, 46 % have been investigated. The drying process kinetics have been investigated on a test bench of convective drying at the following conditions: the drying agent temperature in the drying chamber t = 40–80˚C, velocity V = 1,5 m/s, the moisture content of dry air d = 10 g/kg d.a. The biochemical properties of dried pumpkin seeds were determined by the amount of seeds capable of forming normally developed sprouts under optimal conditions on the 5th, 7th and 10th days of germination. The studies of the properties of pumpkin seeds variety have revealed that when the initial moisture content in the material changes from 0 to 46%, there is an increase in the seeds’ geometric sizes: the length increases by 38%, width – by 10% and thickness – by 8%. Other parameters change too. Investigation of the pumpkin seeds drying process has shown that when the temperature of the drying agent increases, the drying intensity increases also. In particular, the drying time reduces 8 times when the drying agent temperature is raised from 40 to 80 °C. The drying rate curves corresponding to the falling drying rate period with preheating indicate that the highest drying rate at the maximum critical point at a drying agent temperature of 80 °C is 2.32% / min, and the lowest at 40 °C is 0.33 %/min. The heating of the pumpkin seeds takes 3 to 5 minutes depending on the mode, then the temperature of the material does not change significantly and deviates from the temperature of the drying agent by 0.1–0.5 ºС. The generalized curve of kinetics of pumpkin seeds drying makes it possible to describe the general process at different drying modes. The drying agent temperature substantially affects the pumpkin seeds germinability. The most rational mode of drying is at a temperature of 40 °C and an air speed of 1.5 m/s.
Justification of the production lines arrangement based on quantitative and graphic methods for assessing the level of equipment excellence
(2018) Vasylkov, Volodymyr; Chepeliuk, Oleksandr; Chepeliuk, Olena
On the example of the estimation of technical and economic indicators of machines for the production of burger products, the task of multicriterial choice of equipment for the production lines arrangement by methods of spectral analysis, Pareto and distance to the goal was solved. The method of spectral analysis is based on the apparatus of dead-end tests, involves comparing all the definite combinations of features which describe the object, has advantages over Pareto and motion to the goal methods, because it provides a generalized mathematical evaluation of the specimens which are considered. After analyzing five indicators (productivity, capacity, capacity of the feeding bin, weight, overall dimensions) of eight samples of equipment for the burger products production from different manufacturers, it has been established that according to the chosen parameters, the preference should be given to the machine Laminerva C/E 653 1ph. The correctness of a decision primarily depends on the correct choice of indicators to be compared. In their composition, in the future it is necessary to include indicators of reliability and durability, as well as quality indicators of finished products.
Justification of the production lines arrangement based on quantitative and graphic methods for assessing the level of equipment excellence
(2018) Vasylkov, Volodymyr; Chepeliuk, Oleksandr; Chepeliuk, Olena
On the example of the estimation of technical and economic indicators of machines for the production of burger products, the task of multicriterial choice of equipment for the production lines arrangement by methods of spectral analysis, Pareto and distance to the goal was solved. The method of spectral analysis is based on the apparatus of dead-end tests, involves comparing all the definite combinations of features which describe the object, has advantages over Pareto and motion to the goal methods, because it provides a generalized mathematical evaluation of the specimens which are considered. After analyzing five indicators (productivity, capacity, capacity of the feeding bin, weight, overall dimensions) of eight samples of equipment for the burger products production from different manufacturers, it has been established that according to the chosen parameters, the preference should be given to the machine Laminerva C/E 653 1ph. The correctness of a decision primarily depends on the correct choice of indicators to be compared. In their composition, in the future it is necessary to include indicators of reliability and durability, as well as quality indicators of finished products.
Process of hop particle precipitation in combined wort brew machine
(2024) Chepeliuk, Oleksandr; Udodov, Sergiy; Chepeliuk, Olena
A mathematical model of separating solid particles of crushed hops from wort has been developed to improve the combined wort brew machine. A formula for determining the radius of the sediment formation area, which depends on the characteristics of the medium, the operating modes of the apparatus, and the functions characterising the velocity distribution in the boundary layer, is proposed. A dependence for calculating the deposition rate at which moving particles settle to the bottom of the combined wort brew machine is obtained. Based on the obtained results, recommendations on the design and operating parameters of the apparatus are given.