| 摘要 |
A system and a method for measuring air flux in a ventilation duct are provided to increase accuracy of the air flux in low velocity by removing back pressure. A system for measuring air flux in a ventilation duct(10) includes a nozzle(27), third and forth tubes(25c,25d), a differential pressure sensor(28), a suction fan(12), a level meter(17), and a leveling unit. The ventilation duct is coupled to a fixing unit(14) with a hinge, having an inlet and an outlet on both sides for allowing air to flow in and out. The nozzle is attached inside the duct and has a central part protruding for narrowing air passing area. The third and forth ring tubes are installed on the nozzle for measuring pressure of air flux. The differential pressure sensor calculates the difference between pressures measured by the ring tubes. The suction fan is installed in the rear of the nozzle and sucks air. The level meter and the leveling unit are attached to the ventilation duct for controlling horizontality of the ventilation duct. |
