Exercise-2
In a circular duct of diameter 0.5 m, pitot- static tube is installed to measure pressure of air. The air at rest is drawn by a fan. The air temperature is  and at 1 atmospheric pressure. The air discharges at 1.15 atmosphere absolute pressure. If the pitot tube measures a pressure difference 30 mm water, calculate the power required of the fan.
 and  , length of the duct is  . use the equation 
Applying mechanical energy balance between plane 1 and 2.
| Figure 24.1: |
Horizontal duct showing plane 1 and plane 2 |
Substituting the values.
 .
|
