Indoor ventilation is very important in home life or office. Ventilation system is a complete set of devices to realize the function of ventilation, including air inlet, exhaust outlet, air supply pipe, fan, cooling and heating, filter, control system and other auxiliary equipment. The following lists the differences of air duct installation in some specific applications:
1. Installation of ventilation pipe for lampblack
When designing the ventilation duct for installing the range hood, the national standard shall prevail, and the manufacturer's certificate of conformity and inspection certificate must be provided. Generally, the size of the ventilation duct is about 2000*450, which is a relatively large ventilation duct.
2. Yuba ventilation pipe installation
The specification and size of Yuba ventilation pipe installation need to be 300*300mm, or 300*600, and its diameter is about 100 to 150. This ventilation pipe size should be selected according to the area of the home. If the size of the ventilation duct is less than 40cm, the distance between the hangers shall not be greater than 4m. If the size of the ventilation duct is more than 40cm, the distance between the hangers shall not be greater than 3m.
3. Installation of ventilation pipe of fresh air system
The main machine of the fresh air system and the metal air duct shall be insulated. Shock absorbers should be installed on the suspenders; The connection between the fresh air outlet, exhaust air outlet and the main engine shall be installed with silencer or connected with soft connection
Air volume calculation of air duct
For example: if the cross-sectional area of the air duct is 0.2048 square meters, the air flow in the duct is 20 meters / second
0.2048*20*3600=14745 m3 / h
This is the flow required by this pipeline, and others are calculated according to this
The measurement of wind speed and air volume in the ventilation duct is obtained by measuring pressure conversion. To measure the true pressure of the gas in the pipeline, in addition to the correct use of pressure measuring instruments, the reasonable selection of measuring section and the reduction of airflow disturbance have a great impact on the measurement results. The measuring section shall be selected on the straight pipe section with stable air flow as far as possible.
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