Damper curves
Damper curves
(OP)
Among other things we build stacks with installed control dampers to maintain static draft. Customer wants a damper curve (pressure drop vs % open). I feel like there's an appropriate place to start but that I can't find it. We don't do any in place testing so measuring pressure drop at various rates and temperatures and % closed isn't going to work. Perry's doesn't have anything that I can see. Google hasn't come up with much besides HVAC and although it's been somewhat handy I really just need something in the ballpark, not something exact. I'm not sure that's even possible without field data.
Any suggestions?
Any suggestions?





RE: Damper curves
RE: Damper curves
RE: Damper curves
Everybody in the world uses Oxygen analyzers for adjusting damper position (= draft). I would never rely on any equation (even if supplied by the heater manufacturer) in order to adjust position of the damper.
Dejan IVANOVIC
Process Engineer, MSChE
RE: Damper curves
What may make the client happy is a curve of flowrate vs dP, for a set of % open curves.
I think you can mathematically produce such a set of curves if you have even a single data point and some reference assumptions. The first step is to relate % open to area. dP = f(area, flow). The most simple results should be mathematically reasonable. Correcting for non-circular cross-section as the damper closes is a possible enhancement and an area to literature search.
The usefulness of having such curves is debatable, but the effort may be minimal.
best wishes,
sshep