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Clean Room Detection Method Of Air Volume And Wind Speed

Clean Room Detection Method Of Air Volume And Wind Speed

2022-03-24

1. The detection of air volume and wind speed must be carried out first, and all effects of purified air conditioning must be obtained under the designed air volume and wind speed.

2. Before air volume detection, it is necessary to check whether the fan operates normally, whether all components in the system are installed correctly and whether there are obstacles (such as whether the filter is blocked or blocked). All valves should be fixed at a certain opening position, and the size of the measured air outlet and air duct must be measured.

3. For the unidirectional flow (laminar flow) clean room, the air supply volume is determined by the product of the average wind speed of the room section and the cross-sectional area, in which the measured section of the vertical unidirectional flow (laminar flow) clean room is the horizontal section 0.8m away from the ground; The horizontal unidirectional flow (laminar flow) clean room takes a vertical section 0.5m away from the air supply surface. The spacing of measuring points on the section shall not be greater than 2m, and the number of measuring points shall not be less than 10, which shall be evenly arranged. Hot bulb anemometer for instrument.

4. For the turbulent flow clean room, the air supply volume shall be determined by the air outlet method or air duct method. See Item 6, 7 and 8 respectively.

5. For the air outlet without filter, the method in Appendix I of the current national standard code for construction and acceptance of ventilation and air conditioning engineering (gbj243) can be implemented.

6. For the tuyere equipped with filter, the auxiliary air duct can be selected according to the tuyere form, that is, the straight pipe section with the same section as the tuyere and the length equal to twice the side length of the tuyere is made of hard plate, which is connected to the outside of the filter tuyere. The measuring points are evenly arranged on the outlet plane of the auxiliary air duct according to the minimum number of measuring points, and the wind speed of each point is measured with a hot ball anemometer. The air volume is determined by multiplying the average wind speed at the section of the air outlet by the net section area of the air outlet.

7. For the air outlet equipped with similar diffuser, the air volume can be found out according to the air volume resistance curve of diffuser (factory air volume resistance curve or field measured air volume resistance curve) and the measured diffuser resistance (the difference between the static pressure in the orifice and the indoor pressure). When measuring, use a micro manometer and a fine pitot tube, or use a fine rubber tube to replace the pitot tube, but the plane of the measuring hole must be parallel to the air flow direction. In addition, other methods approved by the professional testing department can also be used.


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Suzhou Pharma Machinery Co.,Ltd.

2022/03/21

David


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