Aerodynamic calculation

Aerodynamics and networks

Pressure loss through a ventilation network run by run: Altshul friction plus fitting losses.

Aerodynamic calculation

Pressure loss calculation for a duct network

Run 1

Fitting losses

No items

Velocity0.00 m/s
Specific loss0.00 Pa/m
ΔP friction0.0 Pa
ΔP total0.0 Pa
Results

Results

Runs1
Total length5.0 m
Max flow1000 m³/h
Friction losses0.0 Pa
Fitting losses0.0 Pa
TOTAL (with a 10 % margin)0.0 Pa

Recommended fans

Demo catalogue, hard-coded

Circular in-duct fan VKK-100

VKK-100

Duty: 0.04 kW
Flow: 250 m³/h
Pressure: 240 Pa
Diameter: Ø100
6 900 ₽

Circular in-duct fan VKK-125

VKK-125

Duty: 0.06 kW
Flow: 350 m³/h
Pressure: 280 Pa
Diameter: Ø125
7 800 ₽

Circular in-duct fan VKK-160

VKK-160

Duty: 0.11 kW
Flow: 560 m³/h
Pressure: 330 Pa
Diameter: Ø160
9 400 ₽

Calculation method

The method is set out in SP 60.13330.2020 and Idelchik's handbook of hydraulic resistance.

  • Friction losses: are computed from the Altshul formula, allowing for the roughness of the duct material.
  • Fitting loss coefficients: losses across fittings (bends, tees, reducers) are the sum of the loss coefficients multiplied by the velocity pressure.
Tip: Keep velocities at 4–6 m/s in main ducts and 3–4 m/s in branches. That balances noise against duct size.

The results give the total fan pressure including a 10 % margin for unaccounted losses and leakage.