ENGINEERING HUB
Measure clearly.
Calculate consistently.
Practical SI tools for commissioning checks. Each result shows its assumptions and method so it can be checked against the approved design.
CALCULATOR
Fan speed & density change
Map a known fan-curve point to a corresponding point at another shaft speed and density.
Method and scope
With r = N₂/N₁ and d = ρ₂/ρ₁: Q₂ = Q₁r; Δp₂ = Δp₁dr²; W₂ = W₁dr³.
Same impeller geometry and approximately equal efficiency at similar points. This does not predict the installed operating point or electrical consumption. Check the manufacturer’s speed limits and the actual system curve.
The pre-filled numbers are illustrative examples. Replace them with measured values or verified project inputs. Calculations do not save data or alter equipment.