What is the role of negative pressure in raising chickens? Do chickens need negative pressure? How much negative pressure is needed? We take these questions to enter today’s study. Simply put, “negative pressure” is a state of gas pressure that is lower than normal pressure.
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1.Static negative pressure
When the chicken house is closed and the exhaust fan is turned on, there will be a pressure difference inside and outside the chicken house. This pressure difference is negative pressure. When there is no air flow, the negative pressure is characterized by static negative pressure. same size.
A well-sealed chicken house can generate a negative pressure of more than 30Pa by opening an exhaust fan. Some equipment manufacturers claim that their fans can generate a negative pressure of more than 40Pa. Static negative pressure is an important indicator to measure the airtight performance of a chicken house.
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2.Dynamic negative pressure
In the house with small windows, the negative pressure value is an indirect way to measure the wind speed of the small windows. The greater the pressure difference between indoor and outdoor, the greater the wind speed entering the house; the opposite is also true, that is, the smaller the pressure difference, the lower the wind speed.
The goal of winter ventilation is for cold air to enter through small windows, along the roof to the middle of the house, and then slowly descend to the ground. We want to maximize the time the cool air spends on the roof so it can heat it and reduce its humidity.
At the same time, a certain wind speed also forms an air circulation pattern: cold air enters from the small window, reaches the middle of the roof of the chicken house, then falls to the ground, and finally is discharged by the fan along with the moisture.
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3.Principles
Negative pressure is only a physical state, and it is not useful to chickens. People study it to control the air flow and optimize the environment of the chicken house.
The goal of small window ventilation in winter is to run along the roof as much as possible before the air reaches the middle of the roof. Small windows introduced parallel to the side walls should be smaller.
Wider houses require higher negative pressure values and larger window openings than narrower houses. Colder weather requires greater negative pressure than warmer weather. In all small window ventilation systems, if the opening of the small window is less than 2 cm, it is almost impossible to obtain the ideal air mixing.
Let negative pressure become the burden of raising chickens
- Negative pressure ventilation is a ventilation mode that uses a mechanical method (fan) to actively exhaust air from the chicken house and passively intake air.
- How is negative pressure formed? It is the result that the intake air volume is less than the exhaust air volume, or it can be said that the exhaust air volume is greater than the intake air volume.
- The result of negative pressure is that the air exchange in the chicken house is not complete and timely, thus affecting the air quality and breeding performance.
- Chickens do not need negative pressure, and people do not need negative pressure, so who needs negative pressure? It is the comprehensive needs of building mode, season, heating mode and ventilation mode.
- If you can achieve balance, no dead ends, and no stress ventilation, the smaller the negative pressure, the better.
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