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How to measure the air velocity of high high-efficiency filter
How to measure the air velocity of high high-efficiency filterTesting Instrument: Thermal Ball Anemometer and Measuring StandTesting method: according to "HVAC system air velocity testing procedures" for testing Before the air volume test, it must first check whether the fan is running normally, whether the components in the system are installed correctly, and whether there are any obstacles (such as whether the filter is blocked or blocked), all the valves should be fixed in a certain open position, and must measure the measured air outlet and air duct size. For unidirectional flow (laminar flow) clean room using room cross-section of the average wind speed and cross-sectional area of the product of the method to determine the amount of air supply. Vertical unidirectional flow (laminar flow) clean room to determine the cross-section from the ground 0.8m horizontal cross-section; horizontal unidirectional flow (laminar flow) clean room to take the vertical cross-section from the surface of the air supply 0.5m. The distance between measurement points on the cross-section should not be greater than 2m, and the number of measurement points should be not less than 10, evenly arranged. Detection instruments can be used hot ball anemometer. For turbulent flow clean room, the air outlet method or duct method to determine the amount of air supply. For the installation of filter air outlet, according to the form of air outlet can choose to use an auxiliary duct, that is, made of the rigid plate with the same cross-section of the air outlet, the length is equal to 2 times the length of the air outlet side of the straight pipe section, connected to the outside of the filter air outlet in the auxiliary air outlet plane, according to the number of points of measurement of not less than 6 points of uniform arrangement of measuring points, with a hot-ball anemometer to determine the wind speed at each point. Acceptable standard: The measured average indoor air velocity should be between 100% and 120% of the design air velocity. The surface wind speed at the exit should be ≥0.35m/s. Unevenness of wind speed should be ≤0.25 |
