HVAC CalculationPowered by Solver360

Pressure Drop Calculator

Back to All SolversBack

Input Parameters

Unit System

Imperial (°F, BTU, ft)SI (°C, kW, m)

Velocity (FPM)

Density (lb/ft³)

Friction Factor

Length (ft)

Diameter (in)

Results

Pressure Drop

0

Friction Drop in WG

0

Velocity Drop in WG

0

Total Drop in WG

Parameters

Velocity1,200 FPM

Length100 ft

Diameter12 in

Calculation Steps

1

Calculate Friction Pressure Drop

Formula:

\Delta P_f = \frac{f L \rho V^2}{2 D g}

Calculation:

\Delta P_f = \frac{0.02 \times 100.00 \times 0.0750 \times 20.00^2}{2 \times 1.0000 \times 32.174}

Result:

0.9324 \text{ psf}

2

Calculate Velocity Pressure Drop

Formula:

\Delta P_v = \frac{\rho V^2}{2g}

Calculation:

\Delta P_v = \frac{0.0750 \times 20.00^2}{2 \times 32.174}

Result:

0.4662 \text{ psf}

3

Calculate Total Pressure Drop

Formula:

\Delta P_{total} = \Delta P_f + \Delta P_v

Calculation:

\Delta P_{total} = 0.9324 + 0.4662

Result:

1.3986 \text{ psf}

4

Convert to Display Units

Formula:

P_{in.w.g.} = P_{psf} \times 0.1922

Calculation:

P = 1.3986 \times 0.1922

Result:

0.269 \text{ in WG}