I have a question regarding fan selection; thank you for your help~
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For industrial dust removal, for example in a factory building, I am responsible for conducting tests, and if the measured dust concentration is above the allowed level, I need to recommend the installation of exhaust hoods and fans. So, how do I calculate the size of the exhaust hoods and the power of the fans, based on the actual dust concentration in that factory building and the standard concentrations required? (The actual problem is that some factories already have dust removal equipment; I went to check and found that the dust levels were above the allowed limit. I told them they needed to make some minor adjustments, and they asked how to do that. I said they should install 1-2 fans for local exhaust or add some skylights to allow ventilation and heat dissipation.) Here’s the question: what power rating is needed, and how many fans or skylights are required? I should give some advice, right? Of course, I can come back next time and test again to find out if he has passed or not, but for now the boss wants me to give them a recommendation. . . ) I know there are many uncertainties, and I hope that the professional **s passing by can help this amateur like me out; at least give me some directions. Thank you ~~~~~
A specialist in HVAC should be brought in to determine the size and concentration of dust, the dust removal requirements, and the layout of the factory, so as to design the ventilation equipment and its installation locations.
One can determine which sources are the main sources of pollution. Where there are such major sources, fans should be installed at those locations; if there are no major sources, then rooftop fans should be installed on the roof. The choice of fans is based on the following formula: factory area (in m2) × height (in meters) × 15–20 (the number of air changes per hour, which can be higher depending on the level of pollution and the amount of dust present). This gives the volume of air to be handled in cubic meters. For example, 1000×10×20 = 20,000 m3. In this case, two fans with a capacity of 10,000 m3 each, or four fans with a capacity of 5,000 m3 each, could be used. Just for reference.
I think rather than installing exhaust fans on the roof, it’s better to remove dust based on its properties in order to reduce dust concentration. Improving environmental conditions such as humidity can also reduce dust concentration. Methods such as electrostatic dust removal, bag filter dust removal, and cyclone dust removal, or sealing the dust source, can all be employed.
Thank you to the three people above**; these answers have been very enlightening for me. I’m truly grateful from the bottom of my heart~~~~~:handshake