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

The article deals with the optimization of vertical surfaces with continuous and discrete finning under conditions of natural convection. The optimization was carried out using experimental data obtained for finned surfaces made of steel, taking into account the non-isothermal temperature distribution over the surface of continuous and discrete fins. The dependences of the optimal distance between the ribs on the Rayleigh number and the geometric dimensions of the ribs are found. It was found that with a decrease in the Rayleigh number for discrete non-isothermal fins, the optimal distance between the fins increases compared to the same distance for continuous non-isothermal fins. The differences can be more than 30%. The obtained results for continuous non-isothermal fins are compared with the known results for isothermal fins. It is shown that the presence of non-isothermicity on the surface of continuous fins made of metal materials leads to the need to reduce the inter-fin distance by up to 40%. The results obtained can be useful in the design of finned surfaces under natural convection conditions.

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.