来源： 日期：2020-08-14 发布人：gaoshitongferng
If you want to realize the comprehensive ventilation of ventilation duct, you can use mechanical ventilation or natural ventilation. According to the different characteristics of the system, the comprehensive ventilation can be divided into three types: comprehensive air supply, comprehensive exhaust and comprehensive air supply and exhaust. According to different action mechanism, general ventilation can be divided into dilution ventilation and displacement ventilation. So what are the mechanical ventilation principles for ventilation ducts?
1. Dilution ventilation
Dilution ventilation, also known as mixed ventilation, is to send air with lower concentration than indoor pollutants to mix with indoor air, so as to reduce the concentration of indoor pollutants and meet the health standards.
2. Displacement ventilation
In the displacement ventilation system, fresh cold air is fed from the bottom of the room at a very low speed, and the temperature difference of the air supply is only 2-4y. Because of the high density of the fresh air, it permeates the bottom of the room like water. The heat convection air flow caused by the heat source makes the room produce a vertical temperature Zen degree. The air flow rises slowly and leaves the working area. The waste heat and pollutants are pushed to the top of the room. Finally, it is directly discharged by the air outlet set on the ceiling or the top of the room.
The indoor air flows like a piston, so that pollutants are discharged from the top of the room along with the air flow. The working area is basically in the incoming air, that is, the concentration of pollutants in the working area is approximately equal to the concentration of the air sent to the room. This is the biggest difference between displacement ventilation and traditional dilution ventilation. It is obvious that displacement ventilation is better than dilution ventilation in ventilation duct.
3. Local ventilation
Local ventilation is the use of local air flow, so that local sites are not polluted by harmful substances, resulting in a good air environment.
Local ventilation system can be divided into local air supply and local exhaust. Local exhaust is to collect and purify pollutants on the spot and then discharge them to the outdoor. Local air supply is to send the treated and qualified air to the local working place to ensure the air condition in the local area. As a technical measure to ensure the air quality of working and living environment and prevent indoor environmental pollution, local ventilation should be given priority.
These are the mechanical ventilation principles of the ventilation duct introduced by Gao's ventilation duct. Understanding the mechanical ventilation principle will be of great help to our future installation of ventilation duct engineering, and can also ensure the engineering quality of the ventilation duct. If you have any questions, you can consult us at any time. 上一篇：济南酒店厨房排烟罩设计安装方法