How to control the ventilation in fully enclosed chicken house?

Environmental control is the most important part of modern livestock and poultry centralized breeding, because the closed negative pressure ventilation chicken coop can automatically control the environmental conditions required by chickens, with vertical and horizontal exhaust fans, water curtains and the corresponding air inlets, using heaters/heaters/gas heating in winter, can be based on the physiological characteristics and biological needs of chickens in different periods, reasonable adjustment of environmental conditions in the chicken coop, reduce the impact of stress on chickens, to play the The best production performance, at the same time can greatly reduce labor costs.

Closed ventilation can be used to achieve the following purposes:

Oxygen supply: supply chickens with sufficient oxygen for growth, eliminate harmful gases and reduce the concentration of NH3, H2S, CO2 and other harmful gases; cooling: eliminate excess heat to keep the relative temperature in the house appropriate; heating: raise the temperature of the chicken house by drumming hot air;

Heat dissipation: lower the body temperature of chickens by increasing the wind speed; Humidity dissipation: keep the relative humidity in the house appropriate;

Dust removal: removing dust and reducing the retention of bacteria, viruses and other disease-causing microorganisms in the coop;

Uniform air: there is no dead corner of ventilation in the coop, each chicken can get fresh air, and the wind speed is uniform in all parts of the coop.

Take the egg-laying period as an example, the best breeding temperature is 22-26 degrees Celsius. If the temperature is too low, it is easy to catch a cold and the feeding quantity increases the waste of feed; while if the temperature is too high, the function of the chicken body decreases and it becomes anorexic, it will affect the egg-laying rate of the chicken.

1.Ventilation facilities: It contains ventilation for air exchange in winter (both vertical and horizontal) and cooling ventilation in summer. The number of fans required, depending on different breeding types, the number of breeding, site size and regional climate, the specific calculation can be referred to (ventilation management);

2.Winter ventilation air outlet (side window): At present, the general design of domestic chicken coops, mostly negative pressure ventilation, from the back of the wall of the exhaust fan to pump air, through the side wall of the small window into the air, and then complete the chicken coop required gas exchange;

3.Winter thermostat facilities: mainly for the brooding stage or colder places in the north, mostly using heaters / heaters / gas and other ways to heat, its main role is insulation;

4.Summer cooling air outlet (wind guide / roller shutter): generally matched with cooling water curtain, the role mainly lies in the number of fans open as the indoor temperature rises, increasing the number of air inlets to reduce the pressure difference between indoor and outdoor. In the indoor need to open cooling water curtain cooling time, can be adjusted through its inlet area, change the airflow direction and inlet wind speed, so that the water curtain water mist can be added to the cooling effect;

5.Cooling water curtain: mainly used for cooling, its area size and wet curtain thickness has a certain impact on the cooling effect, matching to calculate a reasonable, or there will be a large temperature difference between the front and rear, of course, will also affect the front and rear humidity imbalance;

The primary prerequisite for good ventilation is good confinement of the coop. In principle, the higher the degree of airtightness, the better, but from the combination of cost and technical considerations, the negative pressure value ≥ 0.254cm water column high (25 Pascal), it is recommended to reach more than 0.384cm water column high (37.5 Pascal).

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