Total External Pressure
Total External Pressure
(OP)
When calculating total external pressure (static and velocity) of a system, how do you account for a specified pressure differential (say, 0.05" W.C. pressure differential relative to outside barometric pressure) that will be accomplished by a modulating damper who's controls are linked to a pressure diffential transmitter?
Would this be considered the total static pressure for that damper (go with 0.05" W.C. for the damper rather than what the vendor specifies which was lower), or would this be in addition to the static pressure of the damper?
Thanks for the help!
Would this be considered the total static pressure for that damper (go with 0.05" W.C. for the damper rather than what the vendor specifies which was lower), or would this be in addition to the static pressure of the damper?
Thanks for the help!





RE: Total External Pressure
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RE: Total External Pressure
Normally, you would add 0.5" just for system effect alone if this is an AHU. On top of a 10% minimum overall safety factor.
0.05" W.C. is so insignificant that you should not waste time with it at all.
RE: Total External Pressure
You may have to clarify your question to get a good answer.