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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The compressibility coefficient Kp may be determined from: Connecting Tubing to Pressure Indicator 6 mm 0. At the entrance of the throat the mean may be 0. In each case, the difference between the two readings shall be within 0. Names, model numbers, serial numbers, scale ranges and calibration information should be recorded. One reading for each checked parameter is required for each amc point with the following exceptions: The flow meter will give a direct reading of the leakage rate.
Airflow adjustment means, such as dampers, auxiliary fan blade or auxiliary fan inlet vane pitch control, or speed control may be required. The power required to drive the fan and any elements in the drive train that are considered a part of the fan.
They shall provide sufficient pressure at the desired airflow to overcome losses through the test setup. Blow through verification test.
The tests are described in Sections A. The minimum pitot tube stem diameter recognized under this standard shall be 2. The ahsi procedure is to subtract the losses for the first condition, make fan law projections of power input for the corrected first condition to the second condition, and then add the bearing and drive losses for the second condition.
A fan shall be tested under this standard according to one of the four general Installation Types that exist in actual applications. The specification 21 an uncertainty based on the maximum observed test reading during the test leads to combined relative uncertainties in both fan pressure and fan airflow rate that are higher at low values of the fan pressure or fan airflow rate than at high values of those test results.
The gas constant R, for air, may be taken as The cross-section of the elliptical portion is one quarter of an ellipse, having the large axis D and the small axis 0.
ANSI/AMCA – Laboratory Methods of Testing Fans for Certified Aerodynamic
A flow nozzle with an integral throat tap shall be used for a ducted flow nozzle setup. The fan law equation for fan velocity pressure Pv follows from that for fan total pressure: Wet-bulb depression is the difference between the dry-bulb and wet-bulb temperatures at the same location.
The interface between a fan and its driver. The ratio of the total kinetic energy of the airflow to the kinetic energy corresponding to the average velocity of the airflow. Using test values for Q, Pt, and H with Equations 7. The number and locations of the measuring stations on each diameter and the number of diameters shall be as specified in Figure 3.
Recalculate C, using Re2: In order to simplify this analysis, test results will be considered to be the curves 21 fan static pressure versus fan airflow rate and fan static efficiency versus fan airflow rate.
The unit of energy is the joule J ; the I-P unit is the foot pound-force ft? The asi shown in Figure 3 are located on each diameter according to the loglinear rule .
The requirements of dynamic similarity lead directly to the pressure relationships expressed by the fan laws. No device used shall significantly affect the rotational speed of the fan under test or its performance. When the fan discharges into a duct with anxi piezometer ring, total pressure Pt2 shall be considered equal to the sum of the average static pressure Ps4 and the velocity pressure Pv4 corrected for the friction loss due to both the straightener and the length L2,4 of the duct between the fan outlet and the measurement amcx.
The net effect with respect to speed is second power. If expressed as a gauge pressure, it may be positive or negative. An outlet ansk used to provide a measurement station shall not have an area more than 5.
In addition, there are various uncertainties which are related to the velocity pressure.
ANSI / Amca 210-07 Airflow Nozzle for Airflow Chamber
Analysis of fan power input is unnecessary amcz it is a part of efficiency analysis. This is easily obtained by using the specified calibration procedures. The hydraulic diameter for round ducts is the actual diameter D.
Standard air has a ratio of specific heats of 1. A derivation of the fan total efficiency equation based on compressible flow values follows . When a chamber piezometer ajca total pressure tube is used for pressure measurement, the average static pressure Ps7 shall be the measured value Ps7r and the average total pressure Pt8 shall be the measured value Pt8r.