Determination of an air jet propagation range in the jet ventilation system of livestock facilities

Indoor climate has a significant impact on health and productivity of personnel and animal performance. An optimal indoor climate depends on the ventilation rate, and the method of air supply and distribution. In industrial enterprises with spacious rooms and large air exchange, jet ventilation is the most common method, which still features uniform distribution of the supply air. The study aimed to optimize the indoor climate system by adjusting the inclination angle of the supply airflow. To ensure the required indoor climate parameters in the entire service area, the authors proposed to change the characteristics of the supply jets, using an aerodynamic nozzle on the outlet of the supply system. It was found out that the inclination angle of the supply air jet is determined by its temperature. The authors carried out mathematical modeling of the flow trajectories of supply air jets that were different in configuration and temperature. They obtained the relationship between the current value of the inclination angle and the supply air temperature for a guide nozzle with the dynamic control system. The criterion for determining the optimal value of the inclination angle for static aerodynamic nozzles was also determined. For the heating period, they calculated the optimal inclination angles of the aerodynamic nozzle guides for three different regions of the country. The performance adequacy of the aerodynamic nozzles was evaluated on a laboratory installation. The results of experimental studies confirmed the possibility and efficiency of regulating the supply airflow vector. The research results will be applicable to further implementation of indoor climate control systems in pig breeding facilities.

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