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Duct Noise Calculator

Formula

The formula to calculate the Duct Noise is:

$DN = 10 + 50 \log(V) + 10 \log(A)$

Where:

$DN$ is the Duct Noise (dB)
$V$ is the air velocity (m/s)
$A$ is the air duct cross-sectional area (m²)

What is Duct Noise?

Duct Noise (DN) is the level of noise generated within an air duct system. It is calculated using the air velocity and the cross-sectional area of the air duct. Higher velocities and larger cross-sectional areas typically result in higher noise levels.

Example Calculation 1

Let's assume the following values:

Air Velocity (V) = 5 m/s
Air Duct Cross-Sectional Area (A) = 0.2 m²

Using the formula:

$DN = 10 + 50 \log(5) + 10 \log(0.2) = 10 + 50 \log(5) + 10 \log(0.2) \approx 10 + 50 \cdot 0.699 + 10 \cdot (-0.699) \approx 37.96 \, \text{dB}$

The Duct Noise is approximately 37.96 dB.

Example Calculation 2

Let's assume the following values:

Air Velocity (V) = 10 m/s
Air Duct Cross-Sectional Area (A) = 0.5 m²

Using the formula:

$DN = 10 + 50 \log(10) + 10 \log(0.5) = 10 + 50 \cdot 1 + 10 \cdot (-0.301) \approx 10 + 50 - 3.01 = 56.99 \, \text{dB}$

The Duct Noise is approximately 56.99 dB.