To complete the complete ventilation of the ventilation duct, there is no harm in deceiving mechanical ventilation or deceiving ventilation to complete it. According to the differences in system characteristics, overall ventilation can be divided into three categories: overall air supply, overall exhaust, and overall air supply and exhaust. According to the differences in effectiveness mechanisms, overall ventilation can be divided into two categories: dilution ventilation and displacement ventilation. So what are the mechanical ventilation guidelines for ventilation ducts?
1. Dilution ventilation
Dilution ventilation, also known as mixed ventilation, refers to the mixing of air with a lower concentration of indoor pollutants, in order to reduce the concentration of indoor pollutants and achieve hygiene standards.
2. Displacement ventilation
In the displacement ventilation system, fresh and cold air is fed in at a very low speed from the bottom of the room, with a temperature difference of only 2-4Y for the supply air. The fresh air sent in is as dense as water and diffuses at the bottom of all rooms. The heat generated by the heat source causes a direct temperature rise in the room, causing the airflow to slowly rise and detach from the working area, pushing waste heat and pollutants towards the top of the room, which is directly swept away by the exhaust vents located on the ceiling or at the top of the room.
The indoor air moves in a piston like manner, allowing pollutants to be swept away from the top of the room with the movement of the air. The working area is fundamentally in the incoming air, which means that the concentration of pollutants in the working area is approximately equal to the concentration of the incoming air. This is a significant difference between displacement ventilation and traditional dilution ventilation. In ventilation ducts, the ventilation effect of significant displacement ventilation is better than that of dilution ventilation.
3. One-sided ventilation
One sided ventilation is the act of deceiving one sided airflow, preventing local pollution from harmful substances and creating an excellent air environment.
The one-sided ventilation system is divided into two categories: one-sided air supply and one-sided exhaust. One sided ventilation is the process of capturing and purifying pollutants on the spot before discharging them outdoors. One sided air supply is the process of delivering air that meets the requirements from the beginning to the end to the area where one sided operations are carried out, in order to ensure the air conditions in the area. The one-sided ventilation method should be prioritized as a technical countermeasure to ensure the air quality of the work and livelihood environment and prevent indoor environmental pollution.
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