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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When locating the traverse plane close to the fan, as is often done in order to minimize the effect of leakage, flow conditions upstream of the fan are usually more suitable. Determine Ps5 by averaging the pressure measurements at each of four static pressure taps located in the duct fitting at the outlets of the fans.
The following motor performance data was supplied by the motor manufacturer: SEF 2 is attributed to the high degree of divergence of the transition fitting at the fan outlet. The effect is most significant when 203–90 doors that are normally closed are kept open for extended periods such as in loading operations.
The static pressure at each traverse plane is determined by using the root mean square of the velocity measurement traverse in each of two branches. In addition, the length of the shut down time and the revisions to site conditions required for its installation are usually undesirable.
AMCA Publication 203-90 (R2007), “Field Performance Measurement of Fan…
Depending on the form of the typical motor performance data, motor publicaation output is determined by one of the following methods: However, AMCA does not guarantee, certify or assure the safety or performance of any products, components publicqtion systems tested, designed, installed or operated in accordance with AMCA standards or that any tests conducted under its standards publcation be non-hazardous or free from risk.
The static pressure at each traverse plane is determined by averaging the static pressure measurements made in the same traverse. Measure the area of Plane 4 for use in calculating Amcw. Before proceeding with the test, it is essential that all dampers outside air, return air, mixing box, multizone, face and bypass, or volume control be fixed in the positions agreed upon by all interested parties as being applicable for the installation.
Motor performance data at operating load, as supplied by motor manufacturer: The use of the calibration of the double reverse tube is described in Annex C.
Spiral vortex may form when fan discharges directly into a stack or similar arrangement. An SEF that accounts for the effect of the cabinet is normally included in this calculation, and it may be necessary to include an Publiccation to account for the conditions at the fan outlet. Before performing any field test, it is strongly recommended that the following AMCA publications be carefully reviewed: In order to calculate the value of SEF2, it is necessary to measure the outlet area of the fan, A2.
AMCA Publication R – Free Download PDF
The uncertainties involved in determining the values of System Effect Factors can be avoided only by correcting the causes of the System Effects. 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.
However, for the purposes of accuracy, static pressure measurements that are used in the determination of fan static pressure must be referred to a common atmosphere. Pitot-Static Tube Holder 0. Normally, velocities encountered in the field test situations are well in excess of fpm. Information as to whether the fan power input ratings include power transmission losses is included in the published performance ratings or is otherwise available from the fan manufacturer.
Manometer Medium press diff. In order to provide a common basis for comparing the field test results to the fan performance ratings, each publicatikn these two items must be the same in both sets of data. The velocity pressure measurement plane should be located a minimum of 1. Determine Ps1 by using a Pitot-static tube or static pressure taps in the duct connection at the fan inlet.
The velocity pressure at the traverse plane is the root mean square of the velocity pressure measurements made in amcca traverse of the plane. The data supplied by the motor manufacturer indicate motor efficiency of Variations from this flow condition as a result of swirl or other mass turbulence are considered acceptable when the angle between the flow stream and the traverse plane is within 10 degrees of a right angle.
This assumes that the velocity pressure in the larger area and the duct friction loss are negligible.
If a Pitot-static tube is used, it should be positioned well within the duct in which Plane 4 is located, and not project into the upstream elbows.
SEF 1 is due to the effect of insufficient length of duct between the fan outlet and the elbow downstream of the fan. Fan total or static efficiencies may be included. This corresponds to a velocity of approximately fpm for air of 0.