Air flow test in dust free workshop

How to test the air flow in the dust-free workshop? The air flow test in the dust-free workshop mainly includes: air flow pattern, air flow direction and air flow parallelism test We test the air flow pattern (unidirectional flow) of the dust-free workshop, make clear the impact of the equipment or facilities in the dust-free workshop on the air flow, select or improve the air flow pattern to produce small turbulence (eddy current), increase the self purification capacity or recovery rate of the dust-free workshop Zui, and shorten the self purification time The detection of air flow manifold shall be carried out according to the following steps: 1) arrange the measuring points: 1) select one vertical and one horizontal section for the vertical one-way flow dust-free workshop, and one horizontal plane 0.8m and 1.5m above the ground; In the horizontal one-way flow dust-free workshop, one longitudinal section and one horizontal plane of the working area height, and three cross sections 0.5 away from the air supply and return walls and the center of the room are selected The distance between the measuring points on all surfaces is 0.2m ~ 1m; 2) One vertical and one horizontal section passing through the center of the representative air supply outlet and the height of the working area are selected for the turbulent flow and dust-free workshop The distance between the measuring points on the section is 0.2m ~ 0.5m, and the distance between the measuring points on the horizontal plane is 0.5m ~ 1m There shall be measuring points on the center line between the two air outlets 2 Determination Method: observe and record the air flow direction point by point with the method of smoke generator or single wire hanging, and measure the angle with the protractor The smoke source can be traced under the high-intensity light source by using the deionized (DI) water atomized by ultrasonic (0.5um ~ 50um water mist), ethanol or glycol generated by spraying method, solid-state carbon dioxide (dry ice), etc Titanium tetrachloride (TiCl4) can be used as tracer particles to ensure no harm to people and objects The detection method of air flow direction is as follows: 1 When the directional flow direction of an area is to be detected, a rod shall be erected in sections between the head and tail of the area, and a single silk line or smoke shall be hung on the rod at different heights Observe and record the directional flow direction according to the same method of measuring air flow pattern It can also be used for section by section relay, visual drawing, photographing and video recording 2 When the directional flow direction of a dust-free workshop is to be detected, a dry test shall be set between the door of the room and the air outlet (return air outlet), the method is the same as above The parallelism of the flow line shall be tested as follows: 1 Observe the flow direction of the air supply plane with a single wire, and each filter corresponds to an observation point 2 use a protractor to measure the angle of air flow direction deviating from the specified direction to avoid human interference.