Air Velocity Calculator

The air velocity calculator is a practical tool for determining the speed of air flow in a duct or other space based on the air flow rate and cross-sectional area.

Background

The concept of calculating air velocity has been important in fluid dynamics and aerodynamics for centuries. It is a key aspect in designing efficient ventilation, heating, and air conditioning systems.

Formula

Air velocity can be calculated using the following formula:

Air Velocity (ft/s) = Air Flow Rate (ft³/s) / Duct Area (ft²)

• Air Flow Rate: The volume of air passing through the duct per unit time, in cubic feet per second (ft³/s).
• Duct Area: The cross-sectional area of the duct, in square feet (ft²).

Example Calculation

For an air flow rate of 500 ft³/s and a duct area of 50 ft²:

Air Velocity = 500 / 50 = 10 ft/s

Importance and Applications

Understanding air velocity is important for:

• HVAC System Design: Ensuring efficient air distribution.
• Environmental Control: Maintaining air quality and comfort inside buildings.
• Industrial Applications: Designing systems for manufacturing processes that require controlled airflow.

FAQ

How does duct shape affect air velocity?

Regardless of shape, the cross-sectional area is the key factor in determining velocity.

Does air velocity affect energy efficiency?

Yes, higher air velocity may require more energy to maintain, thus affecting energy efficiency.

Can this calculator be used for all types of fluids?

This formula is specifically for air. For other fluids, different density and viscosity factors must be considered.

This calculator helps quickly calculate air velocity based on air flow and duct area, suitable for ventilation, air conditioning, and industrial scenarios.