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Air Δ P on a resistance

  1. Oct 6, 2011 #1
    Where in an air supply duct (after the fan) an air damper (or any other resistance to flow) will have less Δ P : closer to the fan, or closer to the outlet ?
  2. jcsd
  3. Oct 6, 2011 #2


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    For any given flow rate and restriction in a flow stream, the irreversible drop in pressure across that restriction will be lowest where density is highest.
  4. Oct 6, 2011 #3
    Thank you very much !
    (all is clear now).
  5. Oct 7, 2011 #4
    One little qwestion more please. For the known volume (for the known dP) to find the mass flow, what pressure (and RH) do we take : one of before the restriction, after, or a mean ?
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