The AMCA laboratory has the capability to test fans, louvers, dampers, air curtains ANSI/AMCA D Laboratory Methods of Testing Dampers for Rating . Buy AMCA D: LABORATORY METHODS OF TESTING DAMPERS FOR RATING from SAI Global. ANSI/AMCA D Laboratory Methods of Testing Dampers for Rating The purpose of this standard is to establish uniform laboratory test methods 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. AMCA International Disclaimer AMCA International uses its best efforts to produce standards for the benefit of the industry and the public in light of available information and accepted industry practices. However, AMCA International does not guarantee, certify or assure the safety or performance of any products, components amda systems tested, designed, installed or operated in accordance with AMCA International standards or that any tests conducted under its standards will be nonhazardous or free from risk.
For information on procedures for submitting and handling complaints, write to: Instruments and Methods of Measurement. Objective, Observations and Conduct of Test.
SI and I-P Conversions. Laboratory Methods of Testing Dampers for Rating 1. Purpose The purpose of this standard is to establish uniform laboratory test methods for dampers. The characteristics to be determined include, as appropriate, air leakage, pressure drop, dynamic closure, and operational torque. It is not the purpose of this standard to specify the testing procedures to be used for design, production, or field testing.
Similarly, it is not the purpose of this standard to indicate or 50d minimum or maximum performance ratings to be used for specifying these products.
The unit of mass is the kilogram kg ; the I-P unit is the pound mass lbm. The unit of time 500f either the minute minor the second s. The unit of force is the newton N ; the I-P unit is the pound lbf.
Scope This standard may be used as a basis for testing dampers when air is used as the test gas. A test conducted in accordance with the requirements of this standard is intended to demonstrate the performance of a damper and is not intended to determine acceptability level for a damper. It is not 5000d the scope of this standard to indicate the actual sequence of testing.
The parties to a test for guarantee purposes may agree to exceptions to this standard in writing prior to the test. However, only a test that does not violate any mandatory requirement of this standard shall be designated as a test conducted in accordance with this standard. Values in mm Hg amda in.
Hg shall be used only for barometric pressure measurements. Units of Measurement 3. SI units are based on the fundamental values of the International Bureau of Weights and Measures , 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 density of distilled water at saturation pressure shall be taken as The density of mercury at saturation pressure shall be taken at Any consistent system of units may be employed to evaluate these quantities unless a numerical factor is included, in which case units must 5000d as specified. Symbols and Subscripts 4. A damper which uses a folded, interlocked series of blades.
A backdraft damper is a damper which, when mounted in a duct or opening, permits the flow of air in one direction only. It may be operated manually or mechanically and may have one or more blades. A damper having one blade. A damper having more than one blade. The damper is a parallel blade damper if the blades rotate in the same direction; and an opposed blade damper if adjacent blades rotate in opposite directions.
It is determined by multiplying the sum of the minimum distances between intermediate blades, top blade and head and bottom blade and sill, by the minimum distance between jambs.
See damper cross-sections Figure 1. Airflow through a aca divided by its free area. Pressure is force per unit area. This corresponds to energy per unit volume of fluid.
Absolute pressure is the value of a pressure when the datum pressure is absolute zero. It is always positive. Barometric pressure is the absolute pressure exerted by the atmosphere at the location of measurement. Gauge pressure is the value of a pressure when the reference pressure is the barometric pressure at the point of measurement. It may be negative or positive.
Velocity pressure is that portion of the air pressure which exists by virtue of the rate of motion only. Static pressure is that portion of the air pressure which exists by virtue of the degree of compression only.
If expressed as gauge pressure, it may be negative or positive. Total pressure is the air pressure which exists by virtue of the degree of compression and the rate of motion.
It is the algebraic sum of the velocity pressure and the static pressure at a point. Thus, if the air is at rest, the total pressure will equal the static pressure.
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Pressure differential is the change in static pressure across a damper. Airflow through a damper divided by its face area. Dry-bulb temperature is the air temperature measured by a dry temperature sensor. Wet-bulb temperature is the temperature measured by a temperature sensor covered by a water-moistened wick and exposed to air in motion.
When properly measured, it is a close approximation of the temperature of adiabatic saturation.
The temperature which exists by virtue of the internal and kinetic energy of the air or gas. If the air or gas is at rest, the total temperature will equal the static temperature.
The temperature which exists by virtue of the internal energy of the air only. If a portion of the internal energy is converted into kinetic energy, the static temperature will be decreased accordingly. The mass per unit volume of air. Standard air is air with a density of 1.
Hg barometric pressure has these properties, approximately. Pressure drop is a measure of the resistance to airflow across a damper. It is expressed as the difference in static pressure across a damper for a specific rate of airflow.
Closure pressure is the differential pressure across the damper when the damper is closed. Airflow leakage is the amount of air passing through a damper when it is in the closed position and at a specific pressure differential.
It is expressed as the volumetric rate of air passing through the damper divided by the face area. The specific airflow conditions are the airflow face velocity when the damper is in the open position and the pressure differential across the damper in the closed position. The airflow face velocity is the velocity established with the damper in the open position. The pressure differential is established when the damper is in the closed position. All airflow measurements and pressure differential measurements are established at ambient conditions and are corrected to standard air.
The damper can be tested in either a ducted or in-wall installation. Elevated temperature dynamic closure is the ability of a damper to properly travel from the full open to the full closed position while exposed to specific airflow conditions at a specified elevated air temperature. This test is conducted in a ducted installation only. The airflow face velocity is the velocity established when the damper is in the open position.
All airflow measurements are established at ambient conditions and are corrected to standard air. Elevated temperature operation is the operational ability of a damper to properly travel from full open to full closed position at elevated temperatures and, if a motorized damper, operate back to a full open position while exposed to specified airflow conditions. The specified airflow conditions are the airflow face velocity when the damper is in the open position and the pressure differential across the damper in the closed position.
All airflow measurements are established at ambient temperature conditions and are corrected to standard air. Dynamic operation torque is the torque at varying angles of rotation of the axle which operates the damper from the full open, to the full closed, and back to the full open position while exposed to specific airflow conditions. The word shall is to be understood as mandatory, the word should as advisory. A determination is a complete set of measurements for a particular point of operation of the test damper.
The measurements must be sufficient to determine all appropriate performance variables as defined in Section 5. A determination or a series of determinations for various points of operation of a damper. Energy factor is the ratio of the total kinetic energy of the flow to the kinetic energy corresponding to the average velocity. Seating torque is the torque amcz to properly seal the test damper. Instruments and Methods of Measurement 6. Equipment other than the examples cited may be used provided the accuracy requirements are met or exceeded.
The static pressure at a point shall be measured on an indicator, such as a manometer, with one leg open to the atmosphere and the other leg connected to a static pressure sensor, such as a static pressure tap or the static tap of a Pitot-static tube. The velocity pressure at a point shall be measured on an indicator, such as a manometer, with one leg connected to a total pressure sensor, such as the impact tap of a Pitotstatic tube, and the other leg connected to a static pressure sensor, such as the static tap of the a,ca Pitot-static tube.
The differential pressure between two points shall be measured on an indicator, such as a manometer, with one leg connected to the upstream sensor, such as a static pressure tap, and the other leg connected 5500d the downstream sensor, such as a static pressure tap. Each pressure indicating instrument shall be calibrated at both ends of the scale and at least nine equally spaced intermediate points in accordance with the following: Since the airflow and pressures through a damper in a typical system are never strictly steady, the pressure indicated on any instrument will fluctuate with time.
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In order to obtain a representative reading, either the instrument must be damped or the readings must be averaged in a suitable manner. Averaging can sometimes be accomplished mentally, particularly if the fluctuations are small and regular. Multi-point or continuous record averaging can be a,ca with instruments and analyzers designed for this purpose. Manometer readings shall be corrected for any difference in specific weight of gauge fluid from standard, any difference in gas column balancing effect from standard, or any change in length of the graduated scale due to temperature.
The total pressure or the static pressure at a point may be sensed with a Pitot-static tube of the proportions shown in Figure 2.
Either or both of these pressure signals can then be transmitted to a manometer or other indicator.