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Yuri B.
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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 ?
Where does an air damper cause less resistance in a supply duct?
- Thread starter Yuri B.
- Start date
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- Tags
- Air Resistance
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Discussion Overview
The discussion centers on the placement of an air damper within an air supply duct and its impact on pressure drop (Δ P). Participants explore the relationship between the location of the damper, flow rate, and pressure changes in the duct system.
Discussion Character
- Technical explanation
- Debate/contested
Main Points Raised
- One participant questions whether an air damper will cause less pressure drop when placed closer to the fan or closer to the outlet.
- Another participant suggests that the irreversible pressure drop across a restriction is lowest where the density of the air is highest, implying a relationship between density and pressure drop.
- A later reply expresses gratitude, indicating that the previous explanations were understood.
- Another participant seeks clarification on how to determine the pressure and relative humidity (RH) to use for calculating mass flow, asking whether to use values from before the restriction, after it, or an average.
Areas of Agreement / Disagreement
Participants do not appear to reach a consensus on the optimal placement of the air damper or the method for determining pressure and RH for mass flow calculations, indicating that multiple views remain on these topics.
Contextual Notes
The discussion includes assumptions about flow rates and pressure drops, but these are not fully resolved. The dependency on specific definitions of pressure and density is also noted but not clarified.
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