Комп’ютерне моделювання тепломасообміну в об’ємі зернової маси за вентилювання повітрям із змінними параметрами

Анотація

COMPUTER SIMULATION OF HEAT AND MASS TRANSFER TO THE EXTENT GRAIN MASS VENTING AIR WITH VARIABLE PARAMETERS

V. Kovbasa, R. Kalinichenko, A. Kurgansky

Introduction. Post-harvest handling and storage of grain is an important step in the overall process of grain that can not only keep quantitatively and qualitatively grown crops, but also to ensure profit maximization of its implementation in the most favorable market conditions.

The feasibility of using active ventilation systems and choice of modes of heat treatment of grain mound depends on the specific economic conditions (gross grain yield, grain moisture, weather conditions, the use of plants for active ventilation with further storage units, etc.). To set the light conditions choose effective scheme of 11 thermal processing of active ventilation, consider the regime parameters of air blown into the grain mass (temperature, moisture content, specific costs).

Analysis of recent researches and publications. If active aeration of grain mass to cool the grain moisture is close to conditioning, with a little intensity, we can assume that the process thermal conductivity is independent of the mass transfer [4]. Under these conditions, the problem calculation process of cooling the grain mass, is reduced to classical Antseliusa-Nuselta problem, exact solution of which is given in [5] but the use of these solutions is possible only for a narrow class of problems termoobrobitku grain. Speed, numerical simulation heat and mass transfer processes in the grain mass [6] the most versatile and provides sufficient accuracy to solve some engineering problems, but it use requires knowledge of programming languages researcher for 4 adjustment algorithms and parameters calculation for each the problem of different types of heat treatment. The study [7], the numerical solution equations of heat and mass transfer variables are not taken into account the time parameters of air supplied to the layer grain.

Purpose. Based on mathematical models that describe the processes of heat and mass transfer in the grain mass to develop a method for determining rational modes of heat treatment (cooling, final drying) active ventilation of grain, for a given technological process indicators that provide energy intensity reduction process bringing grain to the state certified by the humidity and temperature.

Results. Grain mound in the dense layer, the object is a complex dynamic system. Where the information embankment parameters are temperature and humidity, there is a need of temperature distribution and districts throughout the volume of the embankment that leads to the use of complex differential equations of heat and moisture transfer.

Discussion. The proposed method of computer modeling of process of heat treatment of grain in a dense layer of active ventilation, taking into account variables which air is blown grains to determine the modes and settings of equipment for final drying and cooling grain weight, depending on the specific parameters of climatic and operating conditions.