The use of a closed house for broilers is very necessary in line with the development of broilers and the current climate. A closed house is a cage system where the air condition from outside cannot enter, except through the inlet and exit through the outlet which is made in a ventilation system.
The ventilation system is able to remove heat, water vapor, and harmful gases (CO, CO2, NH3) that are in the cage, and are able to provide O2 needs for chickens to get optimal performance. This was conveyed by Suhut, Technical Education & Consultation (TEC) Poultry Management Staff, PT. Medion on Wednesday (18/5) online.
There are various parameters that must be considered in a closed house cage, starting from cage preparation, ventilation, drinking water management, feeding management, lighting, litter, chicken harvesting, and monitoring. In ventilation, there are various types, such as cross-ventilation, tunnel ventilation, longitudinal ventilation, roof ventilation, roof and tunnel ventilation, and longitudinal and tunnel ventilation. “If we want to discuss the need for ventilation in the
cage, we must know about the basic calculations needed so that later the ventilation settings can be properly determined,” said Suhut. The cross-section area is defined as the width multiplied by the height of the cage with a standard closed house size of 120 x 12 x 2 m.
While in the ceiling cage, the calculation of the cross-section area is obtained from the width of the cage multiplied by the average height of the middle and side cages. “For this type of cage, usually the cross-section area will be wider because the height of course will be higher on average than the ceiling cage,” he added.
According to Suhut, the need for the number of fans in the enclosure can be calculated through the maximum airspeed. The maximum air speed is formulated by the cross-section area multiplied by the maximum wind speed to be achieved in the closed house. The maximum speed for adult chickens is usually 3.0 – 3.2 m per second. Thus, the number of fans can be calculated based on the maximum air capacity divided by the fan capacity.
Meanwhile, the cooling pad is an air cooler that is able to takeadvantage of the evaporation of water and is able to filter the air that enters the cage. Calculation of the cooling pad area can be calculated by the total capacity of the fan used, divided by the target wind speed based on the specifications of the installed cell pad. If you use a cell pad with a height specification of 1 foot or 1.5 m, the length of the cooling pad area is calculated by the area of the cooling pad divided by the height of the cell pad.