Of course, an engineer would choose a specific fan static pressure
based on requirements for a specific application, but this reference states values in a very common range as found in typical VAV fan systems (Trane 2016).
IV=internal variables generated from fan laws (B1 and B2) using the input fan static pressure
In either case the energy input will always closely approximate that occurring when the filters are dirty and upon which the fan static pressure
Consider each of the quantities, specifically total fan pressure, fan velocity (dynamic) pressure, and fan static pressure
, described in detail below.
The fan static pressure
requirement for the heavy and extra heavy hoods is more than 2.
Fan energy calculation assumes the following fan static pressures
: --Single wheel AHU (Scenarios A and C): Supply fan static pressure
AMCA Publication 201 defines the magnitude of SE as the difference in fan static pressure
between a fan without SE and a fan with SE.
The second is to use fan total pressure instead of fan static pressure
for fan selection.
7 Pa), the primary fan static pressure
was calculated to be 1.
Typical packaged HVAC systems are mainly employed in light commercial use including hotels, supermarket or retail stores, the compact arrangement of interior components introduces a non-ideal airflow pattern, resulting in both the fluctuation of the field fan static pressure
and the difficulties installing the pressure sensors.
In either case, the energy input will always closely approximate that occurring when the filters are dirty and upon which the fan static pressure
Discharge ducts having a length of two to three times the fan impeller diameter were used to connect the fan to a nozzle chamber; this was employed to measure fan static pressure
and flow rate.