ANSI/AMCA ANSI/ASHRAE Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating An American National Standard. ARLINGTON HEIGHTS, Ill., September 12, – The Air Movement and Control Association. (AMCA) International Inc. announces the revision of ANSI/AMCA. Application: Airflow Test Chamber or Test Duct,Nozzle for measurement of fluid flow. Standards: ANSI/AMCA ,ANSI/ASHRAE , ISO , GB/T

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There is some average airflow rate which is proportional to peripheral speed and flow area. The user is cautioned that this latter type of equipment may yield unreliable readings for a fan operating in an unstable region of its performance 70.

The fan total efficiency multiplied by the ratio of amcq static pressure to fan total pressure. During a laboratory test, the air density and rotational speed may vary slightly from one determination point to another. Still others are derived from the equation of state, the Bernoulli equation, the equation of continuity, and other fundamental considerations.

They shall provide sufficient pressure at the desired airflow to overcome losses through the test setup. Need more than one copy?

Averaging can be accomplished mentally if the fluctuations are small and regular. Every test measurement contains some error and the true value cannot be known because the magnitude of the error cannot be determined exactly. Close the control valve.

ANSI/AMCA – Laboratory Methods of Testing Fans for Certified Aerodynamic

See Annex B for two recommended leakage test methods. Using the above noted correlation factors and recombining the components: These devices shall be free from slip and calibrated. Hg and readable to 34 Pa 0. A complete set of measurements for a particular point of operation of a fan.

This is generally acceptable because fans are not usually rated at the low pressure or low flow portions of their characteristic curves. A static pressure tap meeting the requirements shown in Figure 2A is considered a primary instrument and need not be calibrated provided it is maintained in a condition conforming to this standard. To avoid excessive pressure drop through 20 airflow straightener, careful attention to construction tolerances and details is important [14].


In order to simplify this analysis, test results will be considered to be the anxi of fan static pressure versus fan airflow rate and fan static efficiency versus fan airflow rate.

AMCA – Free Download PDF

The results of an on-site test may deviate from predicted values because of additional uncertainties in measurements such as poor approach conditions to measuring stations. The unit of power is the watt W ; the I-P unit is the horsepower hp.

Barometric pressure shall be listed when fan pressure exceed 2. A chamber may be used for a variety of fans.

To obtain a representative reading, an instrument must either be damped or the reading must be averaged in a suitable manner. The portion of air pressure that exists by virtue of the degree of compression. These types are [13]: If a portion of the internal energy is converted into kinetic energy, the static temperature is decreased accordingly.

The minimum practical tube diameter is 2. A pressure tap is sensitive only to the pressure in the immediate vicinity of the opening. The hydraulic diameter for rectangular ducts shall be calculated from the inside traverse dimensions a and b using: At the time of publication, the editions indicated were valid.

AMCA 210-2007

Since air is compressible, ansl effects influence output and a compressibility coefficient Kp must be applied to make power output proportional to QPt [20]. The examples from above provide the following conclusions: An outlet duct with a Piezometer ring shall be at least 10 diameters long with the Piezometer plane located between 8.

Pressure losses shall be calculated for measuring ducts and straighteners that are located between the fan and the plane of measurement. Dimensions should be checked against a drawing and a copy of the aamca attached to the recorded data.


Refer to Annex G for an example of an iterative process to determine Re and C.

The torque measured on any instrument will ansl with time. A flow nozzle meeting the requirements of this standard is considered a primary instrument and need not be calibrated if maintained in a condition conforming to this standard. The standard deviation of random errors can be determined by statistical analysis of repeated measurements.

ANSI / Amca 210-07 Airflow Chamber, Airflow Duct, Fluid Flow Measurement

This expression is exact for round duct straighteners and sufficiently accurate for rectangular duct straighteners. This includes ratios of thicknesses, clearances, and roughness as well as all the other linear dimensions of the airflow passages. Names, model numbers, serial numbers, scale ranges and calibration information should be recorded.

The velocity pressure at a point shall be measured on an indicator such as a manometer with one leg open to a total pressure sensor, such as the impact tap of a Pitot-static tube, and the other leg connected to a static pressure sensor such as the static tap of the same Pitot-static tube.

When Pitot traverse measurements are made, the fan velocity pressure Pv shall be determined from the velocity pressure Pv3 using: When the fan discharges directly into an outlet chamber, the static pressure Ps2 at the fan outlet shall be considered equal to the average chamber pressure Ps7so that: Using test values for Q, Pt, and H with Equations 7.

The point of operation where the fan static pressure is zero. The difference between ajsi fan total pressure and the fan velocity pressure. One or more supply systems, each with its own nozzle, may be used. The geometry of the common segment is adapted from ISO Tubing Informative Large tubing should be used to help prevent blockage from dust, water, ice, etc.