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8 TRG-TRC013-EN
notes
period one
Fan Performance
Another probe can be placed in the duct with its open end facing into the air
stream. This probe senses total pressure—the combination of velocity pressure
plus static pressure.
Therefore, static pressure can be read directly, while velocity pressure is
derived by subtracting the static pressure from the total pressure.
An alternate method would be to attach the open end of this manometer to the
duct system, using it to measure static pressure. With one end measuring total
pressure and the other end measuring static pressure, the difference read on
the manometer scale would be equal to the velocity pressure.
Measuring Total Pressure
inclined
inclined
manometer
manometer
Figure 13