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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It is best to qmca the systematic uncertainty and then the random uncertainty of the result before combining them into the total uncertainty of the result. To obtain a representative reading, an instrument must either be damped or the reading must be averaged in a suitable manner.
ANSI / Amca 210-07 Airflow Chamber, Airflow Duct, Fluid Flow Measurement
The nameplate data should be copied. The best estimate of the true performance would, therefore, be the mean results based on repeated observations at each point of operation. If, for some unusual conditions, the iterations do not converge, then try a different starting initial guess for C e.
The chamber may have either a circular or 2210 cross-sectional shape. The specification permitting 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.
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. The airflow rate Q5 at the entrance to a nozzle or multiple nozzles with chamber approach shall be calculated from: The fan total efficiency multiplied by the ratio of fan static pressure to fan total pressure.
The degree of similarity of the performance characteristics will depend on the degree of similarity of the fans and of the airflow through the fans. If expressed as a gauge pressure, it may be positive or negative. Hole diameter shall be 0. Variable exhaust system may be an auxiliary fan or a throttling device.
The airflow rate Q3 at the Pitot traverse plane shall be obtained from the velocity V3 and the amva A3 using: The volumetric airflow rate at fan air density. The recommended approximation which meets these requirements is shown in Figure 4B by Cermak, J.
This standard is not included in any packages. The standard density of mercury is For the purpose of calculating the density at Plane 5 only, Ps5 may be considered equal to Ps7. The ratio of absolute nozzle exit pressure to absolute approach pressure shall be calculated from: Fan pressure and fan power shall be plotted as ordinates. The results of a fan test are the various fan performance variables listed in Sections 3. This includes ratios of forces due to elasticity, dynamic viscosity, gravity, surface tension, and inertia as well as the pressure force.
Assuming the uncertainties are small, the characteristic curves and qmca can be replaced by their tangents, and the effects amcw uncertainty in each measurement, Xanai the characteristic uncertainty can be determined. There is some average airflow rate which is proportional to peripheral speed and flow area. Tubing Informative Large tubing should be used to help prevent blockage from dust, water, ice, etc.
AMCA – Free Download PDF
The interface between a fan and its driver. One reading for each checked parameter is required for each test point with the following exceptions: Figure 2B – Total Pressure Tube 0. The two standard deviation limit of a random error has been selected as the random uncertainty.
One or more supply systems, each with its own nozzle, may be used. Complete geometric similarity requires that the ratios of all corresponding dimensions for the two fans be aca.
The temperature that exists by virtue of the internal energy of the air. The unit of pressure is the Pascal Pa ; the I-P unit is either the inch water gauge in.
Standard air has a ratio of specific heats of 1.
Please first log in with a verified email before subscribing to alerts. Please help us to share our service with your friends. A motor shall be calibrated throughout its range of use against an absorption dynamometer except as provided in Section 4. For setups using nozzles, the nozzle diameters shall be recorded.
For extremes of altitude and wet-bulb temperatures, the limit is: A nozzle with throat taps shall be used when the discharge is direct into a duct, and the nozzle outlet should be flanged. The Reynolds Number, Re, based on nozzle exit diameter D6 in meters ftshall be calculated from: An upstream pressure tap shall be located as shown in the figure for the appropriate setup.
The static orifices may not exceed 1 mm 0. 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. Analysis of fan power input is unnecessary since it is a part of efficiency analysis.