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Duct Pressure Drop Calculator

This duct pressure drop calculator is a tool to assist in estimating the pressure drop in an HVAC ducts.

Calculation

Inputs



Density of Air, kg/m3
:1​



Air Stream Velocity, m/s
:1​



Loss Coefficient
:0.5​


Output



Velocity Pressure
:0.5Pa​



Pressure Loss
:0.25Pa​



Explanation

Duct system pressure drop is calculated using the velocity pressure of the duct and the loss coefficient for the particular duct components. The ducts velocity pressure is calculated using the density of air flowing through the duct and the velocity of this air stream.


PT=KT∗PVP_T = K_T*P_V
Where:

PT=Total pressure loss through fittings (Pa)KT=Loss coefficientPV=Velocity pressure (Pa)P_T = Total \: pressure \: loss \: through \: fittings \: (Pa) \\ K_T = Loss \: coefficient \\ P_V = Velocity \: pressure \: (Pa)
To calculate the velocity pressure we use the following equation:

PV=0.5∗ρV2P_V = 0.5*\rho V^2
Where:

ρ=Density of air (kgm−3)V=Velocity of air stream (ms−1)\rho = Density \: of \: air \: (kgm^{-3}) \\V = Velocity \: of \: air \: stream \: (ms^{-1})

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