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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AMCA Airflow Nozzle manufacturers – ec

Diameter ratio has been omitted in Section 7. The range of 510-7 over which equilibrium cannot be established shall be recorded and reported. Other parameters may be measured and used if the maximum error in the calculated density does not exceed 0.

Substituting in the equation for Kp: All chambers must meet the requirements described in Annex A for the purposes of this standard. Explore the Home Gift Guide.

Hg, shall be used only for barometric pressure measurements. In addition, there are various uncertainties which are related to the velocity pressure. Transition Piece Cell Ashrad min. This is the fundamental relationship of the fan laws. These values converge rapidly, and usually only two or three iterations are required. 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.


Reference may be made to the figures in this standard. The user is cautioned that this latter type of equipment may yield unreliable readings for a fan operating in an unstable region of its performance curve. However, it is possible to perform an uncertainty analysis to identify a range of ashrqe within which the true value probably lies.

Groups approve laboratory methods for testing fans.

Dotted lines on the outlet indicate a diffuser cone which may be used to approach more nearly free delivery. In order asurae obtain a representative reading, either the instrument must be damped or the readings must be averaged in a suitable manner. Continue to record until the pressure reaches a state in which the pressure does not change significantly.

The ratio of fan power output to fan power input. The description of the test fan shall be 5-107. The findings from a total pressure analysis would be similar to those of a static pressure analysis.

The cylindrical portion is defined as the nozzle throat. Pressure forces must be proportional to inertia forces.

Groups approve laboratory methods for testing fans.

A thermometer shall be calibrated over the range of temperatures to be encountered during test against a thermometer with a calibration traceable to the Ashraae Institute of Standards and Technology NIST or other national physical measure recognized as equivalent by NIST.

The portion of air pressure that exists by virtue of the rate of motion of the air. Alexa Actionable Analytics for the Web. No statistical means are available to evaluate systematic errors, so these must be estimated. axhrae


A pressure measurement system consisting of indicators and sensors other than manometers sshrae Pitot-static tubes, pressure taps, or total pressure tubes may aashrae used if the combined uncertainty of the system, including any transducers, does not exceed the combined uncertainty for an appropriate combination of manometers and Pitot-static tubes, pressure taps, or total pressure tubes.

Tubing Informative Large tubing should be used to help prevent blockage from dust, water, ice, etc. It is always positive. When pressure response times are long, inspect for possible blockage. The unit of time is either the minute min or the second s in both systems.

amca 210 07 airflow nozzle

When a chamber piezometer or total pressure tube is used for pressure measurement, the average static pressure Ps7 shall be the measured value Ps7r and the average total pressure Pt8 shall be the measured value Pt8r.

When a result of hysteresis, the points shall be identified as that for decreasing airflow rate and that for increasing ashae rate. These devices shall be free from slip and calibrated. The process during compression may be plotted on a chart of absolute total pressure P versus flow rate Q.

Any bi-stable performance points airflow rates at which two different pressure values can be measured shall be reported.