In fact, when analyzing the working performance of the clean module FFU , the main indicators which need to refer to include air quantity, overbottom pressure, noise and efficiency. There are correlations and mutual constraints between these parameters. That is, if you want to improve one of the performance parameters of the clean module FFU, you may need to reduce other part of performance parameters.
Next, we will share some main elements in this regard. In fact, we mainly judge the air quantity of the clean module FFU according to the sectional wind velocity. Considering the use requirements, it is generally reasonable to keep the sectional wind velocity in the range of 0.35 to 0.45 meters per second. For FFU with a specification of 1200 * 600 mm, the range of air quantity is about 910 to 1150 m3 per hour.
In this case, in order to ensure the normal operation of the clean module FFU, the overbottom pressure must be kept at 80 to 120 Pa. This is because the cold resistance of the double row dry table is about 30 to 50Pa, and the resistance of the return air interlayer is about 20 ~ 40pa. In addition, there are other ancillary equipment, and also pay attention to the appropriate selection of the height and width of the return air interlayer.
In fact, when judging the performance of the clean module FFU, noise is also one of the more important indicators. In order to reduce the noise as much as possible, the manufacturers have made a lot of research and improvement. For example, some research and improve the noise elimination structure in the box runner. There are also some research the fluid mechanics in the fan impeller.
However, in actual use, noise is still an important problem. And in the actual work, we may not use a clean module FFU, but hundreds, or even thousands of combinations. Therefore, in the design, we still need to pay attention to this parameter, to determine the clean module FFU operating noise compliance with the relevant standards.