Ventilation tube is widely used in industrial sent and exhaust ventilation, air conditioning and ventilation have a wide range of applications. The choice of material and specifications of the ventilation pipe is closely related to the place of application. Next Xiaobian and everyone to explore how to determine the ventilation duct wind speed and air volume.

        It is understood that the ventilation duct wind speed and air volume measurement is measured by measuring the pressure conversion.

        The actual pressure value of the gas in the pipeline is measured. In addition to the correct use of the pressure measuring instrument, it is reasonable to choose the measurement section and reduce the influence of the airflow disturbance on the measurement result. Measurement section should be selected as far as possible in the smooth flow of straight pipe.

        When measuring the cross section in front of the profiled parts such as elbows and tees (relative to the flow direction of the air flow), the distance from these parts should be greater than 2 times the pipe diameter. When the measuring section is located behind the above parts, the distance from these parts should be greater than 4 to 5 times the pipe diameter.

        When the test site is difficult to meet the requirements, in order to reduce the error may be appropriate to increase the measuring point. However, the minimum distance from the profiled section is at least 1.5 times the diameter of the pipe.