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Pressure losses from flow rates for the 2HP DC
Having measured and calculated a few pressures and flows for the modified generic 2HP I thought I would plot these on a pressure/flow graph which makes it much easier to visualise and starts to show the fan curve for the modified DC.
The graph is for Flow rate versus pressure,
"Theory Max" is the theoretical maximum flow rate determined from an actual static pressure reading of 8.5 " of WC.
This is what some manufacturers measure and why the stated flow claim is 1200 CFM
"Actual Max" refers to a measured flow and the corresponding theoretical pressure determined from the flow.
This means the naked impeller provides a self resistance equivalent of 1" of WC.
"with PF" refers to "with pleated filter" and is a measured flow and a theoretical pressure. This indicates a loss of 2.3" of WC.
"With NF bag" is the same as previous but "with needle felt bag"
The two points with labels [2 x 90º + Xm 6" duct + 1m F] refer to adding 2 90º bends, Xm of 6" ducting and 1m of flex.
These are theoretical flow rates based on pressure losses using Bill Pentz "static calc" pressure/flow spreadsheet.
After all of the above the machines have to be added
https://www.woodworkforums.com/attac...d=278948&stc=1
The direction of the graph towards the LHS is not quite correct.
The trend of the graph must go smoothly through zero so the flows for the left most two points are clearly too high.
The reason for this is that both the pressures and calculated flows for these two points are both theoretical but they will still provide an indication of what is going on.
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