Organized natural air exchange in the premises for the maintenance of animals

Abstract

Creating and maintaining the required parameters of the internal micro-climate in winter in a cowshed of lightweight construction with the use of natural ventilation systems is a time-consuming task. On the one hand, it is necessary to exclude the possibility of acute and chronic cold stress of animals, on the other hand, to ensure uniform ventilation of premises and effective removal of excess heat and harmful substances. The prolonged presence of animals in conditions other than the parameters of the thermoneutral zone affects the thermoregulatory processes of the cows’ body, the quality of milk and their productivity. The paper considers the possibility of implementing an organized natural air exchange in the cold period for housing two hundred animals (livestock). Outside air enters the room through aeration openings with swing-out flaps. The removal of harmful substances and excess heat is carried out through the building’s light-aeration ridge located on the roof. The air flow rate is regulated by changing the area of the versts. Multivariate calculations of air exchange were performed under different outdoor climate conditions. Initially, angles were selected that provide air exchange close to the normalized at the calculated parameters for the cold period of the year. At the same angles, the air exchange is calculated for three winter months, which are compared with the air exchange according to zoohygienic standards.