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 sample analysis given in Annex F calculates the uncertainty in each 2110 the fan performance variables, and in addition, combines certain ones into a characteristic uncertainty and others into an efficiency uncertainty. You may delete a document from your Alert Profile at any time. Close the control valve. Force per unit area. Surrounding this curve is a band of uncertainties, the boundaries of which are roughly parallel to the test curve.
Every test measurement contains some error and the true value cannot be known because the magnitude of the error cannot be determined exactly. Any bi-stable performance points airflow rates at which two different pressure ajsi can be measured shall be reported.
The fan power output Ho would be proportional to the product of fan airflow rate Q and fan total pressure Pt if air were incompressible. The test data which must be recorded varies by setup figure and is shown in Table 3.
Pressure losses shall be calculated for measuring ducts and straighteners that are located between the fan and the plane of measurement. To illustrate, the per unit uncertainty in air density will be calculated: 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, power consumption, air density, speed of rotation, and efficiency for rating or guarantee purposes.
The fan airflow rate Q at test conditions shall be obtained from the equation of continuity: Airflow settling means shall be installed in chambers where indicated on the test setup figures.
ANSI/AMCA – Laboratory Methods of Testing Fans for Certified Aerodynamic
The efficiencies of completely similar fans at completely similar flow conditions are equal. The useful power delivered to air by the fan; it is proportional to the product of the fan airflow rate, the fan total pressure, and the compressibility coefficient. Section A-A shows amcz holes equally spaced and free from burrs.
The torque measured on any instrument ajsi fluctuate with time. A complete set of measurements for a particular point of operation of a fan. Fan pressure and fan power shall be plotted as ordinates.
A piezometer ring is specified for pressure measurement at upstream and downstream nozzle taps and for outlet duct or chamber measurement, unless a Pitot traverse is specified. A standardized air path of a controlled geometry used to provide consistent test results between different test configurations. The blades will be arranged to be equidistant on the circumference with the angular deviation being no greater than 5?
The fan airflow rate Q at test conditions shall be obtained from the equation of continuity: Each pressure indicating instrument shall be calibrated at both ends of the measurement scale plus at least nine equally spaced intermediate points in accordance with the following: The latter may be considered equal to the fan total efficiency for a fan without drive losses.
The examples from above provide the following conclusions: Their derivation is as follows: The fan airflow rate may be calculated from velocity pressure measurements Pv3 taken by Pitot traverse. In order to obtain a representative reading, either the instrument must be damped or the readings must be averaged in a suitable manner.
A piezometer ring is specified for pressure measurement at upstream and downstream nozzle taps and for outlet duct or chamber measurement, unless a Pitot traverse is specified. The interface between a fan and its driver. Additional ductwork of any size including elbows may be used to connect between the chamber and the exit of the 10D minimum test duct.
In each case, the difference between the two readings shall be within 0. Q The fan power output Ho is proportional to the shaded area which leads to: A device that uses a power-driven rotating impeller to move air or gas.
Air temperature measured by a temperature sensing device without modification to compensate for the effect of humidity. Traverse duct shall be round within 0.
ANSI / Amca 210-07 Airflow Chamber, Airflow Duct, Fluid Flow Measurement
Any consistent system of units may be employed to evaluate these quantities unless a numerical factor is included, in which case units must be as specified. Observations and Conduct of Test 6.
This figure anis terminate at Plane 6 and interchangeable nozzles may be employed. To avoid excessive pressure drop through the airflow straightener, careful attention to construction tolerances and details is important .
A derivation of the fan total efficiency equation based on compressible flow values follows . Table 2 may be used as a guide to the selection of an appropriate setup. The total pressure at the fan inlet Pt1 shall be calculated as follows: The coefficient is derived in Annex D. Typical fan performance curves are shown in Figure 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: If both pressure signals are transmitted to the same indicator, the differential is considered velocity pressure at the point of the impact amfa.
Some validation tests require that the flow and pressure be determined prior to the settling means having proved their effectiveness.