International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

A new method of cooling the outside air in ventilation systems of poultry houses is proposed, based on the use of water from underground wells and heat exchangers of recuperators for cooling the supply air.
Numerical modeling of aerodynamics and heat transfer processes in poultry houses at tunnel ventilation system was performed. As a result of numerous calculations the distribution of temperatures, velocities and pressures in the air environment of a poultry house has been obtained. The use of heat exchangers for cooling the supply air allows to maintain its temperature at the level of +20-25 ℃ and to reduce the indicators of moisture content in poultry houses, which are high when using cassette methods or water spraying with nozzles for cooling the supply air.
As a result of the numerous studies conducted, it is recommended to increase the air flow rate by including a third exhaust fan located on the top line of the end rear wall. This will allow for a more uniform temperature distribution in the house.

Maintaining a standardized microclimate in the poultry house is one of the main factors. It is the quality of the air parameters that ultimately determines the quality of the product output. Poultry at its maintenance requires great efforts and technological solutions. In this regard, the study is to improve the system of microclimate in the air environment of the poultry house by including exhaust fans on the rear end wall in a non-traditional way. Computational Fluid Dynamics (CFD) using ANSYS Fluent is a powerful tool for predicting the microclimate system in the poultry house as an alternative to experimental studies. According to the results of CFD modeling of hydrodynamics and heat and mass transfer processes, it was concluded that changing the spoiler angle by 73° allows to supply air to the center of the house. At the same time the pressure drop at the inlet valves is 70.48 Pa, which allows to fully provide the exhaust fan. The air velocity at the inlet of the supply valves is 11.57 m·s–1. The average air velocity at a height of 0.7 m from floor level is 0.46 m·s–1and the temperature is 15.94 ℃. Thus, the presented scientific research can be used in the future in the development of new ventilation systems of poultry houses.

When developing new types of heat exchanger constructions, such factors as their mass-size characteristics, efficiency of heat transfer through the separating heat-carrier surface, pressure losses in the paths for each of the heat-carriers and other parameters characterizing the heat-exchange apparatus play an important role. CFD modeling of heat and mass transfer processes in a tube bundle at different Re numbers with compact placement of tubes, using ANSYS Fluent software package, has been conducted. The mathematical model is based on Navier-Stokes equation, energy conservation equation for convective flows and continuity equation. The standard k-ε model of turbulence is used in the calculations. The fields of velocities, temperatures, pressures in the studied channels have been obtained. The hydrodynamic flow conditions in the channels are analyzed and the intensity of heat transfer between the hot and cold coolant through the wall separating them is estimated. Based on the results of CFD modeling, the criterial equation of Nu, number is derived, which can be used in engineering calculations of heat exchange apparatuses with compact tube bundles.

The article presents the construction of a sectional screw robotic body, the use of which will increase the functional and operational characteristics of flexible screw conveyors when transporting bulk and lumpy materials. An experimental setup of the flexible screw conveyor has been developed to carry out experimental studies. According to the results of the experimental studies of the sectional screw conveyor graphical dependences of torque value changes T and power N on the frequency of rotation of the drive shaft of the working body at full filling of the technological line with the grain material, arising in the process of transporting goods by screw
conveyors were plotted.

By using the application package ANSYS Fluent, the numerical simulation of heat and mass transfer processes in the channels of shell-and-tube heat exchanger with compact placement of tube bundles has been carried out. The fields of velocities, temperatures and pressures in the heat exchanger channel were obtained and the conditions of hydrodynamic flow in the channels and the processes of heat transfer in these channels were analyzed. A new construction of shell-and-tube heat exchanger with compact arrangement of tubes in tube bundles is proposed and developed.