Input Parameters
Input Parameters
Results
Mass flow ṁ
– kg/s
Volume flow V̇
– m³/h
–
Theoretical inner ⌀
– mm
Actual velocity
– m/s
–
–
Pipe Cross-Section
Water (inner diameter)
Steel (wall thickness)
DN Pipe Table · Steel
| DN | Outer ⌀ (mm) | Wall (mm) | Inner ⌀ (mm) | Velocity (m/s) | Deviation (mm) |
|---|
Pressure Drop
Total pressure
drop Δp
drop Δp
–
Friction loss, pipe–
Local losses, fittings–
Specific pressure drop–
Reynolds number Re–
Friction factor λ–
Fittings & local losses – enter quantity of each
ΣK (total)0.00
Velocity pressure ρ·v²/2–
Local losses Δp–
Darcy–Weisbach for straight pipe in commercial steel (ε = 0.045 mm) plus local losses from fittings (Δp = ΣK · ρ·v²/2), calculated with the actual velocity in the selected pipe. K-values are typical values for turbulent flow.
Calculation Method
ṁ = P / (cp · ΔT)Mass flow (from heat output)
V̇ = ṁ / ρVolume flow
A = V̇ / vFlow area
d = √(4·A / π)Theoretical diameter
DN: min |Di − d|Pipe selection
Δp = λ · (L/d) · ρ·v²/2Friction loss (Darcy–Weisbach)
Δp = ΣK · ρ·v²/2Local losses (fittings)