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Static pressure reduction on Face and Bypass Dampers

Static pressure reduction on Face and Bypass Dampers

Static pressure reduction on Face and Bypass Dampers

(OP)
Greetings! I'm new to this forum but whenever I use Google to find engineering answers I find this forum.

I am recommending a face and bypass damper retrofit for a large (60,000 CFM) existing fan system with the intent of saving fan energy. I'm approaching this with the fan laws in hand and have original design static pressures available. I want to install one 2 foot tall damper section in the middle of three 2 foot tall coil sections and am trying to deduce a suitable SP reduction amount. My thinking is to use a number like 1/3 as a prediction (1/3 less SP). Does this sound reasonable? Does anyone have a better approach?

Thanks!  

RE: Static pressure reduction on Face and Bypass Dampers

I think he's looking for the estimated reduction in SP by bypassing the coils.  He said he had the fan laws and design static pressures available.

That said, I think a manufacturer's help would be the best bet here.  Have them select a coil similar to what you have then select one using a F&B system.  The configuration/install of their factory F&B coil is probably going to be different than your retrofit but it might give you a good starting point.  From the sound of it, the retrofit is like an external face and bypass coil rather than an integral one so be sure to mention that.

RE: Static pressure reduction on Face and Bypass Dampers

(OP)
Thanks tys90 and mauricestoker. The FTG manual is new to me and looks like a fan-tastic resource winky smile    

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