Air Volume Flow Calculator

FAQ

• What is the difference between volume flow rate and mass flow rate?
  Volume flow rate measures the volume of fluid passing through a point per unit time (e.g., m³/s), while mass flow rate measures the mass of fluid passing through a point per unit time (e.g., kg/s). Mass flow rate is calculated by multiplying volume flow rate by the fluid density.
• How do I calculate the cross-sectional area for different pipe shapes?
  For circular pipes: A = π × (diameter/2)². For rectangular/square pipes: A = height × width. The calculator automatically handles these calculations based on your selected shape and input dimensions.
• What units can I use for the calculations?
  For dimensions: mm, cm, or inches. For velocity: m/s or ft/s. For density: kg/m³, g/cm³, kg/L, lb/ft³, or lb/yd³. The calculator supports various output units including CMS, CMM, CMH, LPS, LPM, LPH for volume flow, and kg/s, kg/min, kg/h, lb/s, lb/min, lb/h for mass flow.
• How accurate are the flow rate calculations?
  The calculator provides theoretical flow rates based on ideal conditions. For real-world applications, consider factors like pipe roughness, fittings, bends, and fluid viscosity which may affect actual flow rates. The results are suitable for initial design and estimation purposes.
• What are typical velocity ranges for different applications?
  Typical velocities: HVAC ducts (2-8 m/s), water supply pipes (1-3 m/s), compressed air (10-20 m/s), steam (20-40 m/s), and natural gas (5-15 m/s). These ranges help minimize noise, pressure drop, and energy consumption while ensuring adequate flow.
• How do I convert between different flow rate units?
  The calculator automatically handles unit conversions. Common conversions: 1 m³/s = 60 m³/min = 3600 m³/h, 1 L/s = 60 L/min = 3600 L/h, 1 ft³/s = 60 ft³/min = 3600 ft³/h. For mass flow: 1 kg/s = 60 kg/min = 3600 kg/h.