Specific detection methods for measuring wind speed and air volume using anemometers
A. Air volume and wind speed detection must be carried out first. All purification effects are achieved under the designed air volume and wind speed.
B. Before testing, check whether the fan is operating normally. The size of the air outlet and air duct to be tested must be measured on site.
C. For unidirectional flow (laminar flow) clean rooms, the air volume is determined by multiplying the average wind speed of the room section and the clean product.
(Take the section 0.3m away from the high-efficiency filter perpendicular to the air flow as the sampling section. According to the test point spacing should not be greater than 0.6m, set no less than 5 test points on the section, and the arithmetic mean of all readings is used as the average wind speed.) Vertical The measurement section of a unidirectional flow (laminar flow) clean room is based on a horizontal section of 0.8m to 1m on the ground; the measurement section of a horizontal unidirectional flow (laminar flow) clean room is based on a vertical section of 0.5m to 1m on the air supply surface; The number of upper test points should be no less than 10, the spacing should not be greater than 2m, and they should be arranged evenly;
D. For the air outlet with a filter, the air volume is determined by the product of the average wind speed of the air outlet section and the net cross-sectional area of the air outlet. (The average wind speed is obtained by not less than 6 evenly arranged test points on the air outlet section or the section citing the auxiliary air duct.)
E. When there is a long branch pipe section on the upwind side of the air outlet and holes have been or can be drilled, the air duct method can be used to determine the air volume. (Drill a hole no less than 3 times the pipe diameter or 3 times the length of the large side in front of the air outlet;)
F. For rectangular air ducts, divide the measurement section into several equal small sections. Each small section should be as close to a square as possible, with a side length of no more than 200mm. The test point is located in the center of the small section, but there should not be less than 3 tests on the entire section. points; for circular air ducts, the measurement section should be divided and the number of test points should be determined according to the equal-area ring method; a hole should be made on the outer wall of the air duct and a thermal anemometer probe or pitot tube should be inserted. (Convert to air volume by measuring dynamic pressure.)
