January 23, 2019

ASHRAE 51-07 PDF

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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A standardized air path of a controlled geometry used to provide consistent test results between different test configurations.

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Would you like to tell us ashrze a lower price? The names ashrea test personnel shall be listed with the data for which they are responsible. 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 mass per unit volume of air. The point of operation where the fan static pressure is zero.

Groups approve laboratory methods for testing fans.

They shall provide sufficient pressure at the desired airflow to overcome losses through the test setup. Two methods of testing for leakage rate are proposed.

The relative position on a fan characteristic curve corresponding to a particular airflow rate. The uncertainty in the results will be expressed in two parts, both of which will be based on the uncertainties in various measurements. Their derivation is as follows: A derivation of the fan total efficiency equation based on compressible flow values follows [20].

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These laws may be deduced from similarity considerations, dimensional analysis, or various other lines of reasoning. The unit of power is the watt W ; the I-P unit is the horsepower hp. 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. For incompressible flow, the compressibility coefficient is unity and power input is proportional to airflow rate times pressure divided by efficiency.

Nozzle shall be in accordance with Figure 4A nozzle with throat taps. Share your thoughts with other customers. A pre-test uncertainties analysis is not required for each test covered by this standard because it is recognized that most laboratory tests for rating are conducted in facilities where similar tests are repeatedly run.

It is always positive.

The minimum practical tube diameter is 2. When Pitot traverse measurements are made, the fan velocity pressure Pv shall be determined from the velocity pressure Pv3 using: During a laboratory test, the air density and rotational speed may vary slightly from one determination point to another.

The pressure in the chamber is maintained constant.

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When pressure response times are long, inspect for possible blockage. Continuity requires that the mass flow rate at the fan outlet equal that at the fan inlet. It may 51-0 positive or negative.

The macro-pattern of the surface shall not exceed 0. If the fan has more than one impeller, fan rotational speed is the rotational speed of each impeller. Report and Results of Test 8. Wet-bulb and dry-bulb thermometers should be of the same type. In addition, there are various uncertainties which are related to the velocity pressure. If you are a seller for this product, would you like to suggest updates through seller support?

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Every precaution should be taken to ensure that the air velocity does not influence the pressure measurement. An inlet chamber Figure 13, 14 or 15 shall have a cross-sectional area at least five times the fan inlet area.

However, three or four screens with decreasing percent of open area in the direction of airflow are suggested. An airflow straightener is specified so that flow lines will be approximately parallel to the duct 510-7. A leakage test should be performed prior to initial use and periodically thereafter, with corrective action taken if necessary. The flow meter will give a direct reading of the leakage rate. When making fan law conversions, fan speed has a first power effect on airflow rate.

Groups approve laboratory methods for testing fans.

The ashraw specified in the standard are based on two standard deviations. The unit of time is either the minute min or the second s in both systems. The manifold shall have an inside area at least four times that of each tap.

The fan total efficiency multiplied by the ratio of fan static pressure to fan total pressure. Chamber Leakage Rate Test Procedure Informative The volume of interest is the volume between the measurement plane and the air moving device.

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