High efficiency filter test method Before the air volume test, the fan must first check whether the normal operation, the system components are installed correctly, with or without obstacles (such as whether the filter has been blocked, block), all valves should be fixed in a certain open position , And must be measured to measure the actual tuyere, duct size.
For unidirectional (laminar) clean room using the chamber section average wind speed and cross-sectional area of the product to determine the air volume. The vertical unidirectional flow (laminar flow) clean room takes the horizontal section of 0.8m from the ground; the horizontal unidirectional flow (laminar flow) clean room takes the vertical section of 0.5m away from the air supply surface. Cross-section measuring point spacing should not be greater than 2m, measuring points should be no less than 10, evenly arranged. Detection equipment can be used thermal ball anemometer.
For the turbulence clean room, air or air duct method to determine the air volume.
For the installation of the filter outlet, according to the form of air outlet can be used auxiliary duct, that is made with a hard plate and the tuyere inside the same cross-section length is equal to 2 times the length of the straight side of the outlet, connected to the filter outside the tuyere, Pipe outlet plane, according to the minimum number of points measured not less than 6 points evenly arranged measuring points, with hot ball anemometer to determine the wind speed.
Acceptable standard: The measured average wind speed in the room should be between 100% and 120% of the designed wind speed.
The exit surface wind speed should be ≥ 0.35m / s.
Wind speed inhomogeneity should be ≤ 0.25…
