THEORETICAL GROUNDS FOR ANGULAR CORRECTION OF THE SUPPLY AIR JET FLOW VECTOR IN THE VENTILATION SYSTEMS OF INDUSTRIAL AND AGRICULTURAL FACILITIES

During the heating period, the supply air temperature is lower than that in industrial premises, and the cooled air is denser. Entering a warm room, it tends to move downward. This condition leads to the formation of chilled and stagnant zones. The article presents a theoretical study on the possibility of ensuring the maximum propagation range of a non-isothermal supply air jet by angular correction of the flow vector at the outlet of the ventilation unit. Based on the theory of free air distribution, the author analyzed and graphically visualized the flow trajectories of the supply air from the combined climate control unit with heat recovery in the production room in the range of outdoor temperatures from +10 to -40°C. Given the time period of outdoor temperatures, flat sections of a three-dimensional graph were built with a step of 10°C in the range from +10 to -30°C. The author found that the maximum service area of the installation is limited by the propagation range of the supply air jet. The area can be increased by changing the direction of the flow vector by an angle ranging between 0 and 34°. The value of the inclination angle of the flow vector of the supply air jet is determined by the obtained approximation dependency. Considering the regulation of the flow vector, the author used the formula of M.Z. Pechatnikov to determine the propagation range of a limited axisymmetric jet. The studies carried out made it possible to establish the relationship between the propagation range of the supply air jet of the installation and the outside temperature, the inclination angle of the flow vector, and the theoretical variation range of the inclination angle of the flow vector, ranging between 0 and 34°.

1. Tikhomirov D.A., Trunov S.S., Kuzmichev A.V et al. Energy-efficient thermoelectric unit for microclimate control on cattlebreeding premises. Energy Reports. 2020. 6: 293-305. https://doi.org/10.1016/j.egyr.2020.08.052

2. Shatsky V.P., Vysotskaya Zh.V., Gulevsky VA. To the question about work of water-evaporating coolers. Scientific Herald of the Voronezh State University of Architecture and Civil Engineering. Construction and Architecture. 2009. № 3-4 (3-4): 46-51.

3. Gulevsky V.A., Ryazantsev A.A., Nikulichev A.A. et al. Mathematical modeling of processes of heat and mass transfer in channels of water evaporating coolers. Journal of Physics: Conference Series, 2018; 1015: 032052. https://doi.org/10.1088/1742-6596/1015/3/032052

4. Ershova I., Vasilyev A., Samarin G. et al. Development of the experimental heat exchanger for obtaining energy from phasetransition water-ice. International Transaction Journal of Engineering, Management and Applied Sciences and Technologies. 2019. Paper ID: 11A02R. https://doi.org/10.14456/ITJEMAST.2020.38

5. Tikhomirov D.A., Dudin S.N., Trunov S.S. et al. Combined electric accumulation unit for air heating. Revista de la Universidad del Zulia, 2019; 10 (27): 168-183.

6. Shatsky V.P., Gulevsky VA., Chesnokov A.S. Joint modelling of heat and mass transfer and aerodynamic processes in evaporative water coolers. Scientific Herald of the Voronezh State University of Architecture and Civil Engineering. Construction and Architecture, 2012; 3 (15): 26-32.

7. Tikhomirov D., Vasilyev A.N., Budnikov D. et al. Energy-saving automated system for microclimate in agricultural premises with utilization of ventilation air. Wireless Networks, 2020; 26: 4921-4928. https://doi.org/10.1007/s11276-019-01946-3

8. Кирсанов В.В., Игнаткин И.Ю. Струйная модель притока вентиляционного воздуха из теплоутилизационной установки // Вестник ФГОУ ВПО «МГАУ имени В.П. Горячкина». 2018. № 2 (84). С. 28-32. https://doi.org/10.26897/1728-7936-2018-2-28-32

9. Кирсанов В.В., Игнаткин И.Ю. Оценка характера распределения приточного воздуха в условиях струйных течений // Вестник ФГОУ ВПО «МГАУ имени В.П. Горячкина». 2018. № 3 (85). С. 35-41. https://doi.org/10.26897/1728-7936-2018-3-35-41