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Air Flow Measurement
Air Flow Measurement
Air flow performance curves of fans are obtained by using the Double-Chamber method based on AMCA standard. The differential pressure between the front and rear of nozzles (differential pressure: Pn) is measured in order to calculate and obtain the air flow
at the nozzle. At the same time, different pressures between chamber A and B (Static pressure: Ps) is measured and recorded.
By adjusting nozzles, the differential pressure between the front and rear of nozzles can be controlled. The examples have been demonstrated as follow.
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Maximum air flow: |
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when opening nozzles and absorbing the air using the auxiliary blower to make the static pressure (Ps) equal to zero, the differential pressure between chamber A and B, Pn, will be at its maximum value. |
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Maximum static pressure: |
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if nozzles are closed the pressure in the chamber A will be at it's maximum value. The differential pressure, Ps, between the ambient air pressure and the pressure in the chamber can now be considered the maximum static pressure. |
