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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The alternative to dealing with a large magnitude SEF is to eliminate its source.

Determine the fan air flow rate by entering this curve at the test pubkication of fan static pressure and fan power input see Example 5C in Annex A. Although rated as an publixation, sufficient measurements are made to provide performance data for each fan.

These measurements are used in determining densities at the planes of interest. In most cases, the static pressure measurements for use in determining fan static pressure will not be made directly at the fan inlet and outlet, but at locations a relatively short distance upstream from the fan inlet and downstream from the fan outlet.

Hg at Plane 1, calculated as follows: When this possibility exists, it is essential that the static pressure measurements in the region of the fan outlet be referred to the same atmospheric pressure as used in all other pressure measurements. In this example, a measurement plane which provides a satisfactory velocity profile cannot be located upstream of the fans or between the point of connection of the branch ducts and the outlets of the fans.

AMCA R 3 Install a duct on the inlet side of the fan for the purpose of providing a location for the velocity pressure measurement plane. The Pitot-static tube is considered to be a primary instrument and need not be calibrated if maintained in the specified condition.


AMCA Publication R – Free Download PDF

Assume td1 is equal to td3. The use of a torquemeter requires some prearrangement with the purchaser, who would normally have specified such equipment, so that site conditions can be altered to accommodate its installation. Fan direct connected to motor. The sum of the static pressure, Ps1, and velocity pressure, Pv1, at the inlet to the unit assembly is considered to be equal to the sum of the static pressure, Psx, and velocity pressure, Pvx, at a point sufficiently distant from the inlet as to be in still air.

Diameter of the fan inlet: In this example, a watts input measurement is made for 55 AMCA R each motor and motor performance data, supplied by the motor manufacturer, are used in determining motor power outputs.

The method, described pkblication Annex K, requires measurements of the phase currents and voltages supplied to the motor while driving the fan. It is undesirable to have pressure measurement planes located in converging and diverging airways, but there are puublication other more suitable locations for these planes in this installation.

Ps4 may be determined by averaging the static pressure measurements at each of four static pressure taps or by averaging the static pressure measurements made in a Pitot-static tube traverse of Plane 4.

SEF 1 is due to the effect of insufficient length of duct at the fan outlet. The alternative, as indicated in the diagram, is to make a velocity pressure measurement traverse in each branch. When the test value of barometric pressure is to be based on data obtained from a nearby airport, it is important that the data include the barometric pressure for the airport site and the elevation for which the pressure was determined often the barometric pressure is corrected to sea level.


Discussion is limited to systems where there is a clear separation of the fan inlet and outlet and does not cover applications in which fans are used only to circulate air in an open space.

AMCA Publication 203 R2007

Examples of the use of these procedures are included in this section. Estimate free inlet, free outlet fan flow rate by measuring other parameters and interpreting certified ratings performance see Section The alternative, as indicated in the diagram, is to make a velocity pressure measurement traverse in each of two branches. SEF 1 is due to the effect of the elbow located at the fan inlet.

Ps3 is determined by averaging the static pressure measurements made in the same traverse.

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

The barometer should be accurate within 0. The fan performance ratings are based on operation with the fan outlet ducted. When the divergence or convergence of the airway is irregular or more than moderate in degree, significantly nonuniform flow conditions may exist. Hmo For Plane 3b conditions of: Improve the accuracy of the fan static pressure determination by avoiding static pressure measurement plane locations where turbulence or other unsteady flow conditions will produce significant uncertainties in the mental averaging of pressure readings.

The basis for calculations is described in Section Determine pb for the general vicinity of the fans.