Standard and ANSI/ASHRAE Standard 51, except as modified by Units shall be tested in accordance with ANSI/AMCA Standard /ANSI/ASHRAE. Standard — Laboratory Methods of Testing Fans for Aerodynamic Performance Rating (ANSI/AMCA Standard ) (ANSI/ASHRAE Approved). and Air-Conditioning Engineers (ASHRAE) approved ANSI/AMCA Standard ANSI/ASHRAE Standard , Laboratory Methods of Testing Fans for.

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If the volumetric airflow rate at the inlet Q1 is proportional to peripheral speed, the volumetric airflow rate at the outlet Q2 cannot be proportional to ashgae speed or vice versa except for the same degree of compression. Temperature td2 may be considered equal to td5. Edge of hole shall be square and free from burrs. Test Setups and Equipment 5.

Groups approve laboratory methods for testing fans.

Equilibrium conditions shall be established before each determination. Unused nozzles may be sealed on any test. When the fan discharges through an outlet duct without a measurement plane either to the atmosphere or into an outlet chamber, the pressure loss of the duct shall be considered zero and calculations shall be made according to either Section 7.

The barometric pressure is given in inches of mercury. Since the air velocity in an inlet chamber is considered uniform due to the settling means employed, a single measurement is representative of the average chamber pressure. The cross-section of the elliptical portion is one quarter of an ellipse, having the large axis D and the small axis 0.


The directions and points of application of all corresponding vectors must be the same. When making fan law conversions, fan speed has a first power effect on airflow rate.


ashras This requires some backflow to supply the air to mix at the jet boundaries. This may be used to simulate an outlet duct. It is best to determine the systematic uncertainty and then the random uncertainty of the result before combining them into the total uncertainty of the result.

Other parameters may be measured and used if the maximum error in the calculated density does not exceed 0.

See Annex E for their derivation? Observations and Conduct of Test 6.

amca 210 07 airflow nozzle

However, three or four screens with decreasing percent of open area in the ashtae of airflow are suggested. For the test, positions around the periphery of the jets and slightly upstream of the settling means shall be scanned for reverse velocities. The most elaborate analysis would consider all of the 51–07 sources of error including those due to calibration, data acquisition, ashdae reduction, calculation assumptions, environmental effects, and operational steadiness.

All corresponding angles must be equal. These formulae use absolute pressure ratios in inches of water. Individual pressure readings for each pressure tap of the piezometer ring are to be measured.

When Pitot traverse measurements are made, the fan velocity pressure Pv shall be determined from the velocity pressure Pv3 using: Instruments shall be set up, calibrated, and read by qualified personnel trained to minimize errors.


Learn more about Amazon Prime. Share your thoughts with other customers. The airflow rate Q4 at the entrance to a ducted nozzle shall be calculated from: The nozzle surface in the direction of flow from the nozzle inlet towards the nozzle exit shall fair smoothly so that a straight-edge may be rocked over the surface without clicking.

Groups approve laboratory methods for testing fans.

If this alternate arrangement is used, and the calculated plane 8 velocity is greater than fpm then the calculated plane 8 velocity pressure shall be added to the measured static pressure. Their derivation is as follows: Blow through verification test.

The zero torque equilibrium tare and the span of the readout system shall be checked 8 4. The characteristic uncertainty is defined as the difference in airflow rate between the intersection of the parabola with the test curve and the intersections of the parabola with the boundaries. A leakage test should be performed prior to initial use and periodically thereafter, with corrective action taken if necessary. Table 2 may be used as a guide to the selection of an appropriate setup.

Methods of Testing Performance. From the above fan law relationships for fan airflow rate, fan total pressure, and fan total efficiency, it follows that the fan law equation for fan power input H is: The rotational speed of the impeller.