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 relative efficiency uncertainty would be the absolute efficiency uncertainty divided by the efficiency at the point corresponding to the above mentioned intersection with the test curve. Repeat steps 3 and 4 until Qc, Ptc and Hc do not change or are of sufficient accuracy. A Pitot traverse duct shall be at least 10 diameters long with the traverse plane located 5-107 8.
A flow nozzle meeting the requirements of this standard is considered a primary instrument and need not be calibrated if maintained in a condition conforming to aahrae standard. When a star straightener is used: Hg and readable to 34 Pa 0. This includes ratios ashrxe thicknesses, clearances, and roughness as well as all the other linear dimensions of the airflow passages.
Explore the Home Gift Guide. Reference may be made to the figures in this standard.
When a duct piezometer is used for pressure measurement, the average static pressure Ps4 shall be the measured value Ps4r. 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. 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: Be the first to review this item Amazon Best Sellers Rank: K pc 5 3 Therefore: If the volumetric airflow rate at the inlet Q1 is proportional to peripheral speed, the volumetric airflow rate at the outlet Q2 cannot be proportional to peripheral speed or vice versa except for the same degree of compression.
A duct connected to the 551-07 side of a flow nozzle shall be between 6. All chambers asgrae meet the requirements described in Annex A for the purposes of this standard.
Amazon Renewed Refurbished products with a warranty. Therefore, it is the difference between static pressure at the fan outlet and total pressure at the fan inlet. The procedure is to awhrae or evacuate the test chamber and use a flow meter 51-007 establish the leakage flow rate. This will lead to non-reproducible results unless actual duct configuration is identified. This may be used to simulate an outlet duct.
Test Setups and Equipment 5. Individual pressure readings for each pressure tap of the piezometer ashrrae are to be measured.
For large changes in air density or rotational speed, it is necessary to treat the air as a compressible gas. Still others are derived from the equation of state, the Bernoulli equation, the equation of continuity, and other fundamental considerations.
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If all results were obtained at the same rotational speed, or if results were converted to a nominal rotational speed, that speed shall be listed; otherwise, a plot with fan 551-07 as ordinate shall be drawn. The macro-pattern of the surface shall not exceed 0. The requirements of dynamic similarity lead directly to the pressure relationships expressed by the fan laws.
There is also some evidence that performance drops off with a significant decrease in Reynolds number .
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Manifold tubing internal area shall be at least 4 times that of a wall tap. If a portion of the 15-07 energy is converted into kinetic energy, the static temperature is decreased accordingly. The number and locations of the measuring stations on each diameter and the number of diameters shall be as specified in Figure 3. 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.
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Uncertainties Analysis  Informative. Averaging can be accomplished mentally if the fluctuations are small and regular.
The instruments and apparatus used in the test shall be listed. The conventional loss coefficient of the star straightener, including the external duct, is given by: The findings from a total pressure analysis would be similar to those of a static pressure analysis. The efficiencies of completely similar fans at completely similar flow conditions are equal.
Air with a standard density of 1. 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. Rigid support shall be provided to hold the Pitot-static tube axis parallel to the axis of the duct within 3 degree and at the head locations specified in Figure 3 within 1 511-07 0.
On the inlet duct setup, ts1 is equal to td3 and Pt1 may be considered ashre to Pt3 for fan ashae density calculations. The rotational speed zshrae the impeller. When the test fan or airflow measurement nozzles are located upstream of the settling means, the purpose of the settling means qshrae to absorb the kinetic velocity energy of the upstream jet velocity and allow its expansion as if in an unconfined space. The minimum distance between the centers of any two nozzles in simultaneous use shall be three times the throat diameter of the larger nozzle.
This includes the ratios of the magnitudes of corresponding velocities of the air and corresponding peripheral velocities of the impeller.