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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The unit of time is either the minute min or the second s in both systems.
Nozzle shall be in accordance with Figure 4A nozzle with throat taps. If you are a seller for this product, would you like adhrae suggest updates through seller support? At the time of publication, the editions indicated were valid. In order to obtain an average, at least four taps meeting the requirements of Figure 2A shall be manifolded into a piezometer ring. Various dimensionless quantities appear in the text. Dimension D3 or D4 in the test setup figures are the inside diameter of a circular crosssection duct or equivalent diameter of a rectangular cross-section duct with inside traverse dimensions a and b, where: When the fan draws directly from atmosphere, Pt1 shall be considered equal to atmospheric pressure, which is zero gauge, so that: 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.
A Pitot traverse duct shall be at least 10 diameters long with the azhrae plane located between 8. Withoutabox Submit to Film Festivals.
The dimension M in the test setup diagram is the inside diameter of a circular chamber or the equivalent diameter of dimensions a and b, where: Amazon Drive Cloud storage from Amazon. Unused nozzles may be sealed on any test. The Pitot-static tube shall be of sufficient size and strength to withstand the pressure forces exerted upon it. A reaction dynamometer shall be calibrated through its range of usage by suspending weights from a torque arm.
The area A6 is measured at the plane of the throat taps, or the nozzle exit for nozzles without throat taps. The pressure in the chamber is maintained constant. The difference between the total pressure at the fan outlet and the total pressure at the fan inlet. However, AMCA International and ASHRAE do not guarantee, certify or assure the safety of performance of any products, components or 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.
The results of a fan test are the various fan performance variables listed in Sections 3.
Groups approve laboratory methods for testing fans.
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 air pressure that exists by virtue of the degree of compression and the rate of motion of the air. The ratio of absolute nozzle exit pressure to absolute approach pressure shall be calculated from: 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.
Air velocities must be proportional to peripheral velocities. This may be used to simulate an outlet duct. The requirements of kinematic similarity lead directly to the airflow rate relationships expressed by the fan laws.
Ashras result of each ashrse shall be shown by a marker. The ratio of equivalent length Le of a straightener to hydraulic diameter Ashrse shall be determined from the elemental thickness y and the equivalent diameter D using: The procedure is to pressurize or evacuate the test chamber and use a flow meter to establish the leakage flow rate. If a portion of the internal energy is converted into kinetic energy, the static temperature is decreased accordingly.
Any combination of screens or perforated sheets may be used. A Pitot-static tube having the proportions shown in Figures 1A and 1B is considered a primary instrument and need not be calibrated, provided it is maintained in a condition conforming to this standard. A throttling device may be used to control the fan point of operation. The uncertainty in any result can be determined from the uncertainties in the measurement.
Shopbop Designer Fashion Brands. For large changes in air density or rotational speed, it is necessary to treat the air as a compressible gas. 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 fan airflow rate at test conditions Q shall be obtained from the equation of continuity: The static orifices may not exceed 1 mm 0.
This includes the ratios of the magnitudes of corresponding velocities of the air and corresponding peripheral velocities of the impeller. The number and locations of the measuring stations on each diameter and the number of diameters shall be as specified in Figure 3. The ashras between a fan and the remainder of the air system; the respective planes perpendicular to an airstream entering or leaving a fan.
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In case of using manometric head pressure, such as inches of water or mercury, the readings should be corrected for any difference in density of gauge liquid from standard and any difference in local gravitational acceleration from standard.
The portion of air pressure that exists by virtue of the degree of compression. Surrounding this curve is a band of uncertainties, the boundaries of which are roughly parallel to the test curve. A flow nozzle may be any convenient size except when a duct is connected to the inlet of a flow nozzle, in which case the ratio of flow nozzle throat diameter to the diameter of the inlet duct shall not exceed 0.
However, that evidence is not considered sufficiently documented to incorporate any rules in this Annex. The dimensions ‘b’ and ‘h’ are the width and height of a rectangular section of a duct. Values of pressure in in. 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: The report that contains the information required in Section 8.