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Static Pressure

Static Pressure

Static Pressure

(OP)
I would request somebody to help me in understanding the concept of using static pressure in Fans and blowers performance curves. Normally for centrifugal pumps there will be a characteristic curve of differential head vs Flow. Why we use statis pressure rather than the total pressure for blowers?
Where Total Pressure = Static Pressure + Velocity Pressure.

Thanks

RE: Static Pressure

It is easier, less intrusive, and less expensive to measure static pressure; no need to measure the velocity/velocity pressure. Also, if the inlet and outlet diameter of the fan or blower is about the same, there really is no need to measure velocity pressure; it cancels out when calculating the required head.

Good luck,
Latexman

RE: Static Pressure

As Latexman explained:

Fan curves are given in terms of total pressure vs.volumetric flow rate.
Total pressure loss = static pressure loss + dynamic pressure loss:

ΔPtotal = (Pin,static − Pout,static) + ½ ρ (Vin2 − Vout2)

If exit and inlet area of a duct are about the same the dynamic pressure loss (or gain) may by small and disregarded.

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