Broilers have high stocking density and high degree of intensification, and it is indispensable to create suitable humidity and temperature conditions. Maintaining good and controlled ventilation is one of the important measures. The ventilation of the house is divided into mechanical ventilation and natural ventilation.
Natural ventilation is the use of windows under the influence of natural wind and temperature difference. In the northern region, the total window area is generally about 1/3 of the construction area. The general window should be symmetrical and evenly distributed. In order to adjust the amount of ventilation, the windows can also be made up and down two rows, according to the ventilation requirements of the switch part of the window.
Mechanical ventilation is the main method for regulating the environmental conditions in closed houses and broilers with high density and large group feeding conditions. Ventilation is closely related to temperature control, humidity control, dust removal and air conditioning. There are two main types of mechanical ventilation for closed broilers in contemporary broilers, namely horizontal ventilation and vertical ventilation.
(1) Horizontal ventilation. When the length of the house is short and the span does not exceed 10 meters, horizontal ventilation is often used. Horizontal ventilation mainly includes two designs of positive pressure system and negative pressure system. The most common application is the negative pressure ventilation system. The most widely used in production is penetration ventilation. That is, the fan is installed on the side wall, and an air inlet is provided at the corresponding part of the opposite wall of the fan. After the fresh air enters the air inlet, it passes through the horizontal diameter of the chicken house and is discharged outside the house. This ventilation design requires the amount of exhaust air to be slightly larger than the intake air volume, so that the air pressure inside the house is slightly lower than the outside air pressure, which is conducive to fresh air outside the house under the influence of the negative pressure and automatically flow into the house.
(2) Longitudinal ventilation. Longitudinal ventilation should be used when the length of the house is longer than 80 meters and the span is more than 10 meters. It refers to installing the fan on the side wall of the broiler house. The air inlet is set on the opposite side of the fan or on the opposite side wall of the gable, so that the fresh air passes through the vertical diameter of the house under negative pressure. Outside home. During the high temperature season in summer, in order to effectively reduce the temperature of the chicken house, it is usually necessary to install a wet curtain at the air inlet, ie the temperature of the wet curtain is reduced. Because of the advantages of simple design and installation, low cost, good ventilation and cooling effect, the longitudinal ventilation system of chicken houses is widely used in the current chicken production.
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