AMCA Publication (R) Field Performance Measurement of Fan Systems AIR MOVEMENT AND CONTROL ASSOCIATION. use of probes capable of indicating both flow direction and velocity pressure. The AMCA Publication ‘Field Performance. Measurements’ and the AMCA. AMCA International has reaffirmed AMCA Publication. , Field Performance Measurement of Fan Systems. Recommendations in this publication may be.

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This requires revisions to the system. Ps3 is determined by averaging the static pressure 2039-0 made in the same traverse. This will usually require the installation of special ductwork.

In this case, the duct length is so short as to be judged equivalent to there being no duct at all. The double reverse tube must be calibrated and used in the same orientation as used in its calibration 3. The static pressure at this location is difficult to measure accurately with a Pitot-static tube due to the existence of turbulence and localized high velocities.

At this point, the static pressure is zero, and the velocity pressure in still air is zero. In this case, the test conditions are identical to the specified conditions and no calculations are required. AMCA R 5. Descriptions of various types publicaation instruments used to determine range velocities are presented in Annex J. In most cases, fan power input ratings do not include power transmission losses.

Fan speed measurement was not obtained due to the closed duct arrangements on both sides of the fan. Before proceeding with the test, refer to Section Instruments for use in the other measurements involved in the determination of fan static pressure are described in Section Field Test Examples This annex contains examples of field tests.

These methods are intended to provide economical and practical alternatives for dealing with various levels of accuracy requirements.

SEF 1 is due to the effect of insufficient distance between the fan inlets and the side walls of the fan cabinet. To calculate the Fan Section Static Pressure: Release both legs of the tubing simultaneously after the Pitotstatic tube is inside the test duct and properly oriented. Both the manometer connections and the method of calculation are shown in Annex C.


Annex P provides guidance for the location of the traverse plane in these cases.

In addition, when the loss through a damper must be calculated, it is essential that the damper blades be fixed in their full open positions during the test since this is the condition on which the damper pressure loss ratings are based.

Measure the area publciation the traverse plane, A3.

AMCA Publication 203 R2007

Determine Ps3 by averaging publicztion static pressure measurements upblication in the same traverse. Use the field test measurement of watts input and the publicatoin typical motor performance data value of motor efficiency, the motor power output is calculated as: If the motor power output is to be estimated by using the phase current method described in Annex K, it is not necessary to measure AMCA R motor watts; however, it may be necessary to disconnect the drive and measure the no load amps NLA if the motor is not operating at or near its full load point.

Since the performance ratings for the fan section are based on operation without the fan outlet ducted, an SEF does not apply for the unducted position.

Not all of the possible fan-system combinations are included in the examples, but it is expected that the examples will provide sufficient guidance for dealing with those cases not covered. Typical motor performance data may be used to determine fan power input. The basis for these calculations is described in Section When suitable locations are not available, consider making temporary or permanent alterations to the ducting for improved test accuracy.

Measure td3 and tw3 near 203-09 inlet ducts.

AMCA Publication R – Free Download PDF

The conditions which exist at Plane 5, including the static pressure, are assumed to exist at Plane 2, based on their close proximity and the fact that there pyblication no change in publifation between the two planes.

Portions of the procedures are 203-0 for all fan-system installations. It is suited for use in relatively clean gases. SEF 2 is due to the effect of insufficient length of duct at the fan outlet. Typical Fan-System Installations A fan assembly may include any number of appurtenances: Ps3, the static pressure in the vicinity of the ventilator inlet, would normally be determined by averaging the static pressure measurements made in a Pitot tube traverse. It must be connected to two manometers and the static pressure for each point of measurement must be calculated.


Types of Field Tests There are three general categories of field tests: A major problem of testing in the field is the difficulty of finding suitable locations for making accurate measurements of flow rate and pressure.

Drive loss is defined as follows: The density at Plane 2: Ps2, the static pressure at the outlet of the ventilator, is zero gauge pressure, referred to the atmospheric pressure in the region of the ventilator outlet.

The flow rate at the traverse plane is calculated by converting the velocity pressure to its equivalent velocity and multiplying by the area of the traverse plane. Spiral vortex may form when fan discharges directly into a stack or similar arrangement. C Testing a reduced scale model of the complete fan and system using the test methods outlined in this publication.

For fpm velocity and curve U, Figure 7.

AMCA Publication 203-90 (R2007), “Field Performance Measurement of Fan…

If it is deemed necessary to cover several points of operation, provision must be made in advance for changing the system resistance. For the horsepower rating of the motor in this example, it is recommended that the fan power input be determined by using the measured watts input to the motor and motor performance data obtained from the motor manufacturer.

When it is necessary to use more than one traverse plane in order to account for the total flow: