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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Two equations puvlication be used in estimating the motor power output. 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.
AMCA R 8. If there is a change in area between the measurement plane and the plane of interest, then the calculation of the static pressure at the plane of interest must account for velocity pressure conversion and include any associated pressure loss. For Plane 3a conditions of: Normally, velocity pressure measurements would be made in a single plane, located in a duct common to all branches.
The basis used in establishing the air performance ratings for each of these unit types publicatio described below.
AMCA Publication 203 R2007
In many cases, accuracy level requirements will permit the use of a clip-on type ammeter-voltmeter. This is a factory assembled, draw-through 2203-90 station unit. In this example, Ps2 is considered to be equal to Ps5. Before proceeding with the test, refer to Section Fan total or static efficiencies may be included. In all of the equations in this publication, the values of static pressures must be publicahion with their proper signs and combined algebraically.
As these minimum sheave diameters are approached, the drive loss becomes greater. Refer to Section In order to compare the test results publicatiom the quoted fan section curve drawn for operation at rpm and 0.
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.
For practical considerations, it is not normally used in cases where the fan publidation belt driven and where the fan impeller is installed directly on the motor shaft. Use Annex H to determine the number and distribution of the measurement points.
Axial fans are often rated in Fan Total Pressure. This assumption may not be valid, aca the calculated pressure loss values may be significantly inaccurate. At this point, the static pressure is zero, and the velocity pressure in still air is zero.
In 23-90 such as this example, the air may be discharging from the damper into a region in which the atmospheric pressure is somewhat different from that to which all other pressure measurements are referred. For other types of power transmission equipment, consult the fan manufacturer to establish whether transmission losses publicatipn included in the fan ratings, and if so, request the magnitudes of the losses allowed in the ratings. In order to compare the test results to the quoted performance curve for the packaged unit drawn for operation at rpm and 0.
Use a Pitot-static tube of the proportions shown in Annex B, a double reverse tube as shown in Annex C, or a side wall pressure tap as shown in Annex E, and a manometer to measure static pressure. This was considered good practice at one time because the drive would last longer. This can be accomplished by converting the results of the field test to the speed and density conditions of the fan performance ratings. amxa
AMCA Publication R – Free Download PDF
In such cases, the alternatives are: This is done for the purpose of allowing direct comparison of the test results to the design static pressure calculation.
Depending on the operating load point of the motor, it may also involve the measurements of the no load phase currents. 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.
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. When suitable locations are not available, consider making temporary or permanent alterations to the ducting for improved test accuracy.
The angle of the flow stream in any specific location is indicated by the orientation of the nose of the Pitot-static tube that produces the maximum velocity pressure reading at the location.