1. What is an Air Flow Rate Calculator?

Definition: This calculator determines the volumetric flow rate of air based on the cross-sectional area of flow and the air velocity.

Purpose: It helps HVAC engineers, ventilation specialists, and industrial designers calculate air movement in ducts, pipes, and ventilation systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Volumetric flow rate (m³/s)
• \( A \) — Cross-sectional area (m²)
• \( V \) — Flow velocity (m/s)

Explanation: The flow rate is calculated by multiplying the area through which air flows by the velocity of the air.

3. Importance of Air Flow Rate Calculation

Details: Proper airflow calculation ensures adequate ventilation, efficient HVAC system design, and proper industrial process ventilation.

4. Using the Calculator

Tips: Enter the cross-sectional area in square meters and the air velocity in meters per second. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What units should I use for the inputs?
A: The calculator uses metric units - square meters for area and meters per second for velocity.

Q2: Can I use this for liquids as well?
A: Yes, the same formula applies to any incompressible fluid flow.

Q3: How do I measure flow velocity?
A: Velocity can be measured with anemometers or calculated from pressure differentials in duct systems.

Q4: What's a typical air velocity in HVAC systems?
A: Typically 2-5 m/s in ducts, but varies based on application and noise considerations.

Q5: How does temperature affect the calculation?
A: This calculator assumes standard conditions. For precise calculations at different temperatures, use the ideal gas law to adjust for density changes.