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Determination of the air performance
curves is obtained by using the double chamber method
based on AMCA standard. The
difference between the pressures before and after
the nozzle (differential pressure Pn) is measured
to obtain the air flow at the
nozzle and the different pressures between those
in the two chambers (static pressure Ps). The air
flow is calculated from the
differential pressure by using equation (A). The
auxiliary blower cancels out the aerodynamic resistance. |
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Maximum air flow : When opening the
nozzle and absorbing the air using the auxiliary
blower to make the static pressure zero
(Ps=0), the differential pressure (Pn) between chamber
A and chamber B will be at it’s maximum. The
air flow obtained by applying
the differential pressure (Pn) to the above equation
can be called the maximum air flow.
Maximum static pressure : As shown in the figure,
when closing the nozzle, the pressure in the chamber
a will be at it’s maximum.
This differential pressure (Ps) between the air
pressure and the pressure in the chamber A can be
called the maximum static
pressure. |
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