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Reply by Mike_D_S

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Posted on Floor dryer as air cleaner

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Mike_D_S

596 posts in 2722 days


#1 posted 01-12-2019 08:32 PM

So first off, I’ll start with saying everything below is just my personal opinion and thoughts. In my opinion, the design above is more based on what looks good as compared to maximizing filtering in as much of the shop volume as possible.

The average velocity of air flow is based on the cross sectional area of the duct. The volume of air moved will be defined by the fan. So let’s say the fan is 1600 CFM exhaust, then the incoming volume is the same. So if the filters are 24”x24”, then each is 4 sq ft, for 16 sq ft total. 1600 CFM / 16 sq ft = 100 ft/min (theoretical) for the average velocity at the filter face. Which assumes the air flow is evenly distributed, which we know is not really right

100 FPM is pretty low and coming in from all four sides means that you probably are not going to be getting good airflow from very far from the filters. This doesn’t count other benches, etc which will disrupt the airflow to the unit.

Going to one filter increases the theoretical velocity to 400 FPM at the filter face. Placing the filter opposite the exhaust helps to create a circular flow where the exhaust blows one way which will tend to push air to the wall so it recirculates around the outside of the room so the intake on the other side can draw it back in.

The fact it’s on the floor will make it less effective overall due to the disruptions the rest of the stuff on the floor cause in the air flow, which is why most of these type of units hang from the ceiling.

If you only want localized filtering close to the unit, then the design above will work effectively in the near area, but if you are thinking to emulate a ceiling mounted filter to take the fines out of the air in as much of the shop as possible, in my opinion its not a suitable design.

Mike

-- No honey, that's not new, I've had that forever......


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