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
|Published (Last):||2 August 2009|
|PDF File Size:||13.2 Mb|
|ePub File Size:||4.75 Mb|
|Price:||Free* [*Free Regsitration Required]|
It is controlled during a test by adjusting the position of a throttling device, by changing flow nozzles or ani fan characteristics, or by any combination of these. An outlet duct used to provide a measurement station shall not have an area more than 5. The total pressure at the fan inlet Pt1 shall be calculated as follows: It also applies to Figure 15 in Plane 8, in which case, the mean velocity in Plane 6 nozzle outlet is called the jet velocity.
For converging inlets without connection elements, the inlet area amxa be considered to be that amcca a plane perpendicular to the airstream first meets the mouth of the inlet bell or inlet cone.
An auxiliary fan shall not surge or pulsate during a test. All chambers must meet the requirements described in Annex A for the purposes of this standard. Instruments shall be set up, calibrated, and read by qualified personnel trained to minimize errors.
The most elaborate analysis would consider all of the elemental sources of error including those due to calibration, data acquisition, data reduction, calculation assumptions, environmental effects, and operational steadiness.
The best estimate of the true performance would, aca, be the mean results based on repeated observations at each point of operation.
ANSI / Amca 210-07 Airflow Nozzle for Airflow Chamber
These values converge rapidly, and usually only two or three iterations are required. The net effect with respect to speed is second power. The chamber may have either a circular or rectangular cross-sectional shape.
Efficiency is based on a per-unit basis. The geometry of the common segment is adapted from ISO The duct friction shall not be considered.
The compressible flow methods given in Section 7. The form of the airflow straightener shall be as specified in Figure 6A or 6B. Purpose and Scope This standard establishes uniform test methods for a laboratory test of a fan or other air moving device to determine its aerodynamic performance in terms of airflow rate, pressure developed, ahsi consumption, air density, amfa of rotation, and efficiency for rating or guarantee purposes.
AMCA – Free Download PDF
The compressibility coefficient Kp may be determined from: The 201 pressure when the datum pressure is the barometric pressure at the point of measurement. A flow nozzle may be any convenient size except when a duct is connected to the inlet of a flow nozzle, in which case the ratio of flow nozzle throat diameter to the diameter of the inlet duct shall not exceed 0.
The recommended approximation which meets these requirements is shown in Figure 4B by Cermak, J. Generally, several screens in each airflow settling means will be required.
When the fan discharges directly to atmosphere, the static pressure at the fan outlet Ps2 shall be considered equal to atmospheric pressure, which is zero, so that: The difference between the total pressure at the fan anei and the total pressure at the fan inlet. The number of determinations required to establish the absi of a fan over the range from shut-off to free delivery will depend upon the shape of the characteristic curve of the fan under test.
The characteristic uncertainty can be defined with reference to the following diagram: The compression process may be assumed to be polytropic for which, from thermodynamics: At the time of publication, the editions indicated were valid.
The uncertainty in the aca will be expressed in two parts, both of which will be based on amc uncertainties in various measurements.
The coefficient of friction f shall be determined from : If the total-temperature rise could be measured with sufficient accuracy, it could be used to determine z, but in most cases better accuracy is obtained from the other measurements.
The ansj airflow rate may be calculated from velocity pressure measurements Pv3 taken by Pitot traverse. P Q Anai fan power output is proportional to the shaded area, which leads to: A pressure measurement system consisting of indicators and sensors other than manometers and Pitot-static tubes, amcx taps, or total pressure tubes may be used if the combined uncertainty of the system, including any transducers, does not exceed the combined uncertainty for an appropriate combination of manometers and Pitot-static tubes, pressure taps, or total pressure tubes.
The duct friction shall not be considered. A dry-bulb thermometer shall be mounted upstream of the wet-bulb thermometer. The process during compression may be plotted on a chart of absolute total pressure P versus flow rate Q.
Fan total pressure, fan static pressure, or both may be shown. Analysis of fan power input is unnecessary since it is a part of efficiency analysis.
On all inlet 7.