Air Velocity Calculator

Air Velocity Calculator:

Enter the values of air flow rate, AFR_(m3/s) and duct area, DA_(m2) to determine the air velocity, V_air(m/s).

Enter Air Flow Rate :		m3/s
Enter Dct Area :		m2
Result – Air Velocity :		m/s

Air Velocity Formula:

Air velocity is defined as the speed at which air moves through a specific area.

Velocity, V_air(m/s) in metres per second, is calculated by dividing the air flow rate, AFR_(m3/s) cubic metres per second by the duct area, DA_(m2) in square metres.

Air Velocity, V_{air (m/s)} = AFR_(m3/s) / DA_(m2)

V_air(m/s) = air velocity in metres per second, m/s.

AFR_(m3/s) = air flow rate in cubic metres per second, m³/s.

DA_(m2) = duct area in square metres, m².

Air Velocity Calculation:

1.A ventilation system has an air flow rate of 0.5 m³/s and the air moves through a duct with an area of 0.25 m². Calculate the air velocity.

Given: AFR_(m3/s) = 0.5m³/s, DA_(m2) = 0.25m².

Air Velocity, V_{air (m/s)} = AFR_(m3/s) / DA_(m2)

V_air(m/s) = 0.5 / 0.25

V_air(m/s) = 2m/s.

2.The air flow rate (AFR) is 1.2 m³/s, and the air velocity is 3 m/s and find duct area.

Given: AFR_(m3/s) = 1.2m³/s, V_air(m/s) = 3m/s.

Air Velocity, V_{air (m/s)} = AFR_(m3/s) / DA_(m2)

DA_(m2) = AFR_(m3/s) / V_{air (m/s)}

DA_(m2) = 1.2 / 3

DA_(m2) = 0.4m².