Question

The fan pressure differential gage on an air handler reads 12 cm H2O. What is this pressure differential in kiloPascals

Answer 1

Answer:

$1.18\ \text{kPa}$

Explanation:

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

h = Height of reading = 12 cm

$\rho$ = Density of water = $1000\ \text{kg/m}^3$

Pressure due to height difference is given by

$P=\rho gh\\\Rightarrow P=1000\times 9.81\times 12\times 10^{-2}\\\Rightarrow P=1177.2\ \text{Pa}=1.1772\ \text{kPa}\approx 1.18\ \text{kPa}$

The pressure differential is $1.18\ \text{kPa}$.