Examples
Examples
Try the starting example
- Airflow (m³/s)
- 1.2
- Rectangular duct width (mm)
- 600
- Rectangular duct height (mm)
- 400
- Cross-sectional area (m²)
- 0.24
- Mean velocity (m/s)
- 5
- Hydraulic diameter (mm)
- 480
Try another scenario
- Airflow (m³/s)
- 2.2
- Rectangular duct width (mm)
- 600
- Rectangular duct height (mm)
- 400
- Cross-sectional area (m²)
- 0.24
- Mean velocity (m/s)
- 9.166667
- Hydraulic diameter (mm)
- 480
Calculation method
Calculation method
Cross-sectional area (m²)
Velocity = volume flow / section area; rectangular hydraulic diameter = 2wh/(w+h).
Mean velocity (m/s)
Velocity = volume flow / section area; rectangular hydraulic diameter = 2wh/(w+h).
Hydraulic diameter (mm)
Velocity = volume flow / section area; rectangular hydraulic diameter = 2wh/(w+h).
Symbols and units
- a
- Airflow (m³/s)
- b
- Rectangular duct width (mm)
- c
- Rectangular duct height (mm)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- User-supplied measurements and assumptions; Velocity = volume flow / section area; rectangular hydraulic diameter = 2wh/(w+h). Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.