In the practical activities of engineering projects, there is usually such a situation that the wind speed at the inlet and outlet of the ventilation system is very high, even above 20 ~ 30 m / s. at this time, the noise is very large and must be solved by reducing the noise.
The noise at the entrance and exit of ventilation system is mainly composed of the following two noise sources:
1. Mechanical equipment noise of ventilation and cooling equipment
2. High speed airflow noise.
At this time, in order to reduce the noise reasonably, in addition to considering the noise of machinery and equipment, we should also consider the list of natural ventilation galvanized steel ventilation pipe: the reduction of wind speed.
In addition, the height of wind speed also determines the reasonable length of muffler.
In general, natural ventilation is used to reduce the wind speed of airflow, such as reducing the wind speed from 30 m / s to less than 10 m / s. At this time, the muffler is more cost-effective, and the length of the muffler is generally designed and manufactured according to the airflow rate after deceleration.
Which part of muffler is more suitable for installation? It is not allowed to install the diameter after the diameter change first, but the installation immediately after the diameter change will cause the following conditions:
1. If the muffler is installed immediately after the diameter change, the air flow vortex will expand and the friction resistance of the exhaust system will increase
2. If the air flow in the management center area at the inlet of the muffler can't catch up with the sufficient attenuation coefficient, it will rush into the muffler immediately, then the specific air flow rate in the muffler will be much higher than that in the design scheme of the muffler series. Then what list should be set for the ventilation pipe of galvanized steel sheet: the specific and reasonable length of the sounder is reduced, and the expected effect of the muffler is far from meeting the requirements of the design scheme.
The proper way is to increase the diameter of the reduced ventilation duct by 5 ~ 8 times, and install the muffler when the air flow is constant, then the muffler can achieve the design effect. 上一篇：山東通風管道制作安裝|風管的三種類型