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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When a Common part is used: It may be desirable to convert all test points to a nominal density, a constant rotational speed, or both.
When the fan is connected to an inlet duct, Pt1 shall be considered equal to the algebraic sum of the average static pressure Ps3 and the average velocity pressure Pv3corrected for the friction due to the length of duct L1,3 between the measurement plane and the fan, so that: Such a device shall be located on the end of the test 2110 or test chamber and should be symmetrical about the duct or chamber axis. Since air is compressible, thermodynamic effects influence output and a compressibility coefficient Kp must be applied to make power output proportional to QPt .
A total pressure tube is considered a primary instrument and need 70 be calibrated provided if it is maintained in a condition conforming to this standard.
A total pressure tube is considered a primary instrument and need not be calibrated provided if it is maintained in a condition conforming to this standard.
Dotted lines on fan inlet indicate an inlet bell and one equivalent duct diameter which may be used for inlet duct simulation. The difference between the total pressure at the fan outlet and the total pressure at the fan inlet. 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. The contribution to the combined uncertainty in the airflow measurement shall not exceed that corresponding to 1.
This is generally acceptable because fans are not usually rated at the low pressure or low flow portions of their characteristic curves. Observations and Conduct of Test 6. This includes ratios of thicknesses, clearances, and roughness as well as all the other linear dimensions of the airflow passages. The standard density of water or mercury and the standard gravitational acceleration are wnsi in Section 3.
ANSI/AMCA – Laboratory Methods of Testing Fans for Certified Aerodynamic
For an inlet chamber, the test pressure could be negative, and for outlet chambers, the test pressures could be positive. When the fan discharges into a duct with a Pitot traverse, total pressure Pt2 shall be considered equal to the sum of the average static pressure Ps3 and the velocity pressure Pv3 corrected for the friction loss due to both the equivalent length Le of the straightener and the length L2,3 of the duct between the fan outlet and the measurement plane.
The larger size is helpful in preventing blockage due to dust, water, ice, etc.
Dotted lines on the outlet indicate a diffuser cone which may be used to approach more nearly qnsi delivery. Traverse duct shall be round within 0. A static pressure tap meeting the requirements shown in Figure 2A is considered a primary instrument and need not be calibrated provided it is maintained in a condition conforming to this standard.
A small dimension J may make it difficult to meet the criteria given in Annex A. The difference between the two tare values shall be within 0. Plans shall be made to vary the opening of the throttling device in such a way that the test determinations will be well-spaced.
A pressure measurement system consisting of indicators and sensors other than manometers and Pitot-static tubes, pressure taps, or total pressure tubes may be used if the combined uncertainty of amda system, including any transducers, does not exceed qnsi combined uncertainty for an appropriate combination of manometers and Pitot-static tubes, pressure taps, or total pressure tubes.
The combined uncertainty for each of the fan performance variables is given below.
AMCA – Free Download PDF
Diameter ratio has been omitted in Section 7. The geometric mean is the square root of the product of the two end values: If all results were obtained at the same air density, or if results were converted to a nominal air density, that air density shall be listed; otherwise, a plot with air density as ordinate shall be drawn. The combined uncertainty for each of the fan performance variables is given below.
Pressure forces must be proportional to inertia forces. 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 method of joining cell segments such as tack welds shall be kept to the minimum required for mechanical integrity and shall result in minimum protusion into the fluid stream. 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.
A properly performed laboratory traverse is assumed to have equal accuracy: The uncertainty of the airflow rate measurement can be reduced by changing to a smaller nozzle or combination of nozzles for the lower airflow rate range of the fan.
Values of pressure in in. The compression process may be assumed to be polytropic for which, from thermodynamics: An outlet duct used to provide a measurement station shall not have an area more than 5. If any of the criteria amc not met, the design of the settling means must be altered, and all testing restarted.
However, AMCA International and ASHRAE do not guarantee, certify or assure the safety of performance of any products, components asi systems tested, designed, installed or operated in accordance with this standard or that any tests conducted under this standard will be non-hazardous or free from risk. Equilibrium conditions shall be established before each determination. Diameter ratio has been omitted in Section 7.
Calibration correction need not be made if the correction is smaller than one-half the maximum allowable uncertainty, as specified in Section 4. An acceptable alternative is the use of a nozzle with maca throat tap in which case the throat tap located as shown in Figure 4 shall be used in place of the downstream pressure tap shown in the figure for the setup and the piezometer for each flow nozzle shall be connected to its own indicator.
The results of a fan test are the various fan performance variables listed in Sections 3. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. The point of operation where the fan static pressure is zero.
ANSI / Amca 210-07 Airflow Nozzle for Airflow Chamber
Manifold tubing internal area shall be at least 4 times that of a wall tap. An outlet chamber Figure 11 or 12 shall have a cross-sectional area at least nine times the area of the fan outlet or outlet duct for a fan with axis of rotation perpendicular to the discharge airflow and a cross-sectional area at least sixteen times the area of the fan outlet or outlet duct for a fan with axis of rotation parallel to the discharge airflow.
The coefficient of friction f shall be determined from : If all results were obtained at the same air density, or if results were converted to a nominal air density, that air density shall be listed; otherwise, a plot with air density as ordinate shall be drawn.
The equation for efficiency may be rearranged to give either: Amva reading for each checked parameter is required for each test point with the following exceptions: However, three or four screens with decreasing percent of open area in the direction of airflow are suggested. All chambers must meet the requirements described in Annex A ama the purposes of this standard.