How does the clean room detect wind volume and wind speed?
1. The wind speed and wind speed detection must be carried out first. The effects of purifying the air conditioner must be obtained under the designed wind speed and wind speed conditions.
2. Before the air volume test, it is necessary to check whether the fan is running normally, whether the components in the system are installed correctly, and it is barrier-free (such as whether the filter is blocked or blocked). All valves should be fixed at a certain open position and must be actually measured. The measured air outlet and duct size.
3. For the unidirectional flow (laminar flow) clean room, the air supply volume is determined by the method of the average wind speed and cross-sectional area of ​​the chamber section, wherein the measured cross-sectional area of ​​the vertical unidirectional flow (laminar flow) clean room is 0.8 m from the ground. Horizontal section, horizontal unidirectional flow (laminar flow) clean room takes a vertical section of 0.5m from the air supply surface. The distance between the measuring points on the section should not exceed 2m, and the number of measuring points should be no less than 10, evenly arranged. The instrument uses a hot ball anemometer.
4. For the turbulent clean room, the air supply method or the air duct method is used to determine the air supply volume. The methods are as follows, item 6, item 7, and item 8, respectively.
5. For the tuyere without filter installed, it can be carried out according to the current national standard "Code for Construction and Acceptance of Ventilation and Air Conditioning Engineering" GBJ243 Appendix 1.
6. For the air outlet with the filter, the auxiliary air duct can be selected according to the tuyere form, that is, the straight pipe section which is made of the hard plate and has the same length as the air inlet, and the length is equal to 2 times the length of the tuyere, is connected to the outside of the filter tuyere. On the exit plane of the auxiliary duct, the measuring points are evenly arranged at least 6 points according to the minimum number of measuring points, and the wind speed of each point is measured by a hot ball anemometer. The air volume is determined by the net cross-sectional area of ​​the average wind speed of the tuyere section.
7. For the tuyere with the same diffusion plate, the air volume can be detected according to the diffused air volume resistance curve (factory air volume resistance curve or field measured air volume resistance curve) and the measured diffusion plate resistance (difference between the aperture and the indoor pressure). . In the measurement, the micro-pressure gauge and the micro-management are used, or the fine rubber is used instead of the sub-management, but the plane of the hole is parallel to the direction of the airflow. In addition, other methods approved by the professional testing department may be used.
8. When there is a long branch pipe section on the windward side of the tuyere and the hole has been or can be punched, the air volume can be determined by the air duct method. The distance between the section and the local resistance component is determined. The former resistance component is not less than 3 times the diameter of the tube or the length of the 3 times of the large side. In the partial resistance component, the latter is not less than 5 times the diameter or 5 times the length of the large side.
9. For a rectangular duct, divide the measured section into several equal small sections. Each small section is as close as possible to a square. The side length is preferably not more than 200 mm. The measuring point is set at the center of the small section, but the number of points on the entire section. Not less than 3. For circular ducts, the cross section should be divided according to the equal area ring method and the number of measuring points should be determined.
A hole is made in the outer wall of the duct for insertion into the hot ball anemometer rod or the sub-host. When using Pitot, the dynamic pressure is measured first, and then the air volume is determined by the following formula:
Q=1.29F
Pa={(++)/n}2
Q----wind volume, m3/s
F----pipe cross-sectional area, m2
Pd1...Pdn----dynamic pressure at each point, Pa.
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