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Air Velocity Calculator

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Input Parameters

Unit System

Imperial (°F, BTU, ft)SI (°C, kW, m)

Airflow (CFM)

Duct Area (sq ft)

Results

Air Velocity Analysis

1,000

Velocity FPM

116,478

Reynolds Number

Turbulent

Flow Regime

0

Pressure Drop in WG

Calculation Steps

1

Convert Airflow to m³/s

Formula:

Q_{m³/s} = Q_{CFM} \times 0.000471947

Calculation:

Q_{m³/s} = 1000 \times 0.000471947

Result:

0.471947 \text{ m³/s}

2

Convert Area to m²

Formula:

A_{m²} = A_{ft²} \times 0.092903

Calculation:

A_{m²} = 1 \times 0.092903

Result:

0.0929 \text{ m²}

3

Calculate Air Velocity

Formula:

V = \frac{Q}{A}

Calculation:

V = \frac{0.471947}{0.0929}

Result:

5.08 \text{ m/s}

4

Convert Velocity to FPM

Formula:

V_{FPM} = V_{m/s} \times 196.85

Calculation:

V_{FPM} = 5.08 \times 196.85

Result:

1000.00 \text{ FPM}

5

Calculate Reynolds Number

Formula:

Re = \frac{V \times D_h}{\nu}

Calculation:

Re = \frac{5.08 \times 0.344}{1.5 \times 10^{-5}}

Result:

116478 \text{ dimensionless}