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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Reproduction or translation of any part of this work beyond that permitted by Sections and of the United States Copyright Act without the permission of the copyright owner is unlawful. The major changes reflected in this revision are: Patrick Chinoda Charles W.

WOLTER PTE LTD.

Danos Rad Ganesh Paul R. 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 51-0 standard will be non-hazardous or free from risk.

For information on procedures for submitting and handling complaints, write to: Instruments and Methods of Measurement. Test Setups and Equipment. Observations and Conduct of Test. Report and Results of Test.

Piezometer ring check optional. Blow through verification test. Reverse flow verification wshrae. Similarity and Fan Laws Informative.

Uncertainties Analysis [10] Informative. The interfaces between a fan and the remainder of the air system; the respective planes perpendicular to an airstream entering or leaving a fan. The interface between a fan and its driver. The gross inside area measured in the plane s of the outlet opening s.

The gross inside area measured in the plane s of the inlet connection s. For converging inlets without connection elements, the inlet area shall be considered to be that where a plane perpendicular to the airstream first meets the mouth of the inlet bell or inlet cone.

Air temperature measured by a temperature sensing device without modification to compensate for the effect of humidity. The air temperature measured by a temperature sensor covered by a water-moistened wick and exposed to air in motion. Wet-bulb depression is the difference between the dry-bulb and wet-bulb temperatures at the same location. The temperature that exists by virtue of the internal and kinetic energy of the air.

If the air is at rest, the stagnation total temperature will equal the static temperature. The temperature that exists by virtue of the internal energy of the air. If a portion of the internal energy asrae converted into kinetic energy, the static temperature is decreased accordingly.

The mass per unit volume of air. 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 asheae airflow rate, pressure developed, power consumption, air density, speed of rotation, and efficiency for rating or guarantee purposes.

This standard applies to a fan or other air moving device when air is used as the test gas ashrar the following exceptions: Normative References The following standards contain provisions that, through specific reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on 15-07 American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below.

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A device that uses a power-driven rotating impeller to move air or gas. This limit is approximately equivalent to a pressure of 30 kPa in. Air with a standard density of 1. Standard air has a ratio of specific heats of 1. Force per unit area. This corresponds to energy per unit volume of fluid. In the I-P system, pressures are expressed in manometric head pressure, such as inches of water or inches of mercury. The conversion of 1 in. The pressure when the datum pressure is absolute zero.

It is always positive. The pressure exerted by the atmosphere. The velocity pressure corresponding to the average velocity at the fan outlet. The difference between the fan total pressure and the fan velocity pressure.

Therefore, it is the difference between static pressure at the fan outlet and total pressure at the fan inlet. The rotational speed of the impeller. If the fan has more than one impeller, fan rotational speed is the rotational speed of each impeller.

The ratio of the mean airflow rate through the fan to the airflow rate at fan air density; the ratio of the fan total pressure that would be developed with an incompressible fluid to the fan total pressure that is developed with a compressible fluid, i.

The compressibility coefficient is a thermodynamic factor that must be applied to determine fan total efficiency from fan airflow rate, fan total pressure, and fan power input. The coefficient is derived in Annex D.

The useful power delivered to air asrae the fan; it is proportional to the product of the fan airflow rate, the fan total pressure, and the compressibility coefficient. The power required to aashrae the fan and any elements in the drive train that are considered a part of the fan. The ratio of fan power output to fan power input. The fan total efficiency multiplied by the ratio of fan static pressure to fan total pressure.

The relative position on a fan characteristic curve corresponding to a particular airflow rate. It is controlled during a test by adjusting the position of a throttling device, by changing flow nozzles or auxiliary fan characteristics, or by any combination of these. The point of operation where the fan static pressure is zero. The point of operation where the fan airflow rate is zero. The differential pressure when the datum pressure is the barometric pressure at the point of measurement.

It may be positive or negative. The portion of air aashrae that exists by virtue of the rate of motion of the air. The portion of air pressure that exists by virtue of the degree of compression. If expressed as a gauge pressure, it may be positive or negative. The air pressure that exists by qshrae of the degree of compression and the rate of motion of the air. It is the algebraic sum of velocity pressure and static pressure at a point.

If air is at rest, its total pressure will equal the static pressure. The density of the air corresponding to the total pressure and the stagnation total temperature of the air at the fan inlet.

The volumetric airflow rate at fan air density. The difference between the total pressure at the fan outlet and the total pressure at the fan inlet. A complete set of measurements for a particular point of operation of a fan. A series of determinations for various points of operation of a fan. The ratio of the total kinetic energy of the airflow to the kinetic energy corresponding to the average velocity of the airflow.

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Demonstrated accuracy is defined for the purposes of this standard as the accuracy of an ashraae or the method established by testing of the instrument or the method against a primary or calibrated instrument or method in accordance with the requirements of this standard. The unit of power is the watt W ; the I-P unit is the horsepower hp.

The unit of energy is the joule J ; the I-P unit is the foot pound-force ft? The unit of torque is the Newton-meter N? Efficiency is based on a per-unit basis. Percentages are obtained by multiplying by The unit of viscosity is the Pascal second Pa?

K ; the I-P unit is the foot pound-force per pound-mass degree Rankine ft? Various dimensionless quantities appear in the text.

Groups approve laboratory methods for testing fans.

Any consistent system of units may be 51–07 to evaluate these 551-07 unless a numerical factor is included, in which case units must be as specified. SI units are based on the fundamental values of the International Bureau of Weights and Measures [2], and I-P values are based on the values of the National Institute of Standards and Technology which are, in turn, based on the values of the International Bureau. The unit of length is the meter m or millimeter mm ; I-P units are the foot ft or inch in.

The unit of mass is the kilogram kg ; the I-P unit is the pound-mass lbm. The unit of time is either the minute min or the second s in both systems. The unit of force is the Newton N ; the I-P unit is the pound-force lbf.

The unit of pressure is the Pascal Pa ashrar the I-P unit is asurae the inch water gauge in. Values of pressure in in. Hg, shall be used only for barometric pressure measurements. Equipment other than the examples cited may be used provided the accuracy requirements are met or improved upon. The specifications regarding accuracy correspond to two standard deviations based on an assumed normal distribution.

The calibration procedures given in this standard shall be employed in order to minimize errors.

Groups approve laboratory methods for testing fans.

Instruments shall be set up, calibrated, and read by qualified personnel trained to minimize errors. The most elaborate analysis would consider all of the elemental sources of error including those due to calibration, data acquisition, data reduction, calculation assumptions, environmental effects, and operational steadiness. The sample analysis given in Annex F calculates the uncertainty in each of the fan performance variables, and in addition, combines certain ones into a characteristic ashra and others into an efficiency uncertainty.

Every test measurement contains some error and the ashrxe value cannot be known because the magnitude of the error cannot be determined exactly.

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