ARI 880-2008 Performance Rating of Air Terminals.pdf

1、 2008 Standard for Performance Rating of Air Terminals ARI Standard 880 Copyright Air-Conditioning, Heating and Refrigeration Institute Provided by IHS under license with ARI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Price $12.00 (M) $25.00 (NM) Printed in U.

2、S.A. Copyright 2008, by Air-Conditioning, Heating and Refrigeration Institute Registered United States Patent and Trademark Office IMPORTANT SAFETY DISCLAIMER AHRI does not set safety standards and does not certify or guarantee the safety of any products, components or systems designed, tested, rate

3、d, installed or operated in accordance with this standard/guideline. It is strongly recommended that products be designed, constructed, assembled, installed and operated in accordance with nationally recognized safety standards and code requirements appropriate for products covered by this standard/

4、 guideline. AHRI uses its best efforts to develop standards/guidelines employing state-of-the-art and accepted industry practices. AHRI does not certify or guarantee that any tests conducted under its standards/guidelines will be non-hazardous or free from risk. ARI CERTIFICATION PROGRAM PROVISIONS

5、Scope of the Certification Program The certification program includes all Air Terminals as defined in Section 3. Exclusion: This certification program does not apply to the rating and testing of retrofit units. Certified Ratings The following certification program ratings are verified by test at the

6、 standard rating conditions (Section 7.2): Primary Airflow, cfm m3/s Induced or Fan Airflow, cfm m3/s Electrical Power Input, watts W Minimum Operating Pressure, in H2O kPa Radiated Sound Power Level, dB (125 to 4000 Hz octave band) Discharge Sound Power Level, dB (125 to 4000 Hz octave band) USE OF

7、 THE SOUND RATINGS Sound power level data generated by use of this standard with air terminals are directly applicable to ARI Standard 885, a procedure for using published sound ratings in the estimating of sound levels in occupied spaces. Note: This Standard supersedes ARI Standard 880-1998. Forewo

8、rd Units tested and rated in accordance with ARI Standard 880 are required to be tested in a reverberation room that meets the broadband requirements of ARI Standard 220. Units certified in accordance with the ARI Standard 880 Certification Program are required to be verified by a test in a reverber

9、ation room that meets both the broadband and pure tone qualification requirements of ARI Standard 220. Copyright Air-Conditioning, Heating and Refrigeration Institute Provided by IHS under license with ARI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE OF CO

10、NTENTS PAGE Section 1. Purpose 1 Section 2. Scope . 1 Section 3. Definitions . 1 Section 4. Symbols . 5 Section 5. Classifications . 6 Section 6. Test Requirements . 6 Section 7. Rating Requirements . 7 Section 8. Minimum Data Requirements for Published Ratings 10 Section 9. Marking . 11 Section 10.

11、 Voluntary Conformance . 11 TABLES Table 1. Octave Band Center Frequencies 3 Table 2. Symbols . 5 Table 3. Expression of Airflow Rates . 8 Table 4. Minimum Significant Sound Power Levels 8 Table 5. Recommended Inlet Airflow . 9 Table 6. Discharge/Radiated Sound Power Level Standard Rating Conditions

12、 9 Table 7. Sound Power Level Rating Tolerances . 10 FIGURES Figure 1. Air Terminal and Air Outlet Configuration 4 Figure 2. Acoustically Isolated Duct 7 Figure 3. Acoustically Isolated (Lagged) Duct . 7 Copyright Air-Conditioning, Heating and Refrigeration Institute Provided by IHS under license wi

13、th ARI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-APPENDICES Appendix A. References Normative 12 Appendix B. References Informative 12 Copyright Air-Conditioning, Heating and Refrigeration Institute Provided by IHS under license with ARI Not for ResaleNo repro

14、duction or networking permitted without license from IHS-,-,-ARI STANDARD 880-2008 1 PERFORMANCE RATING OF AIR TERMINALS Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish for Air Terminals: definitions; classifications; test requirements; rating requirements; minimum data

15、requirements for Published Ratings; marking and nameplate data; and conformance conditions. 1.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, engineers, installers, contractors and users. 1.1.2 Review and Amendment. This standard is subject to review

16、and amendment as technology advances. Section 2. Scope 2.1 Scope. This standard applies to air control devices used in air distribution systems. These devices provide control of air volume with or without temperature control by one or more of the following means and may or may not include a fan: a.

17、Fixed or adjustable directional vanes (i.e. Bypass Air Terminal) b. Pressure dependent volume dampers or valves (including air induction nozzles and Dampers) c. Pressure compensated volume dampers or valves (including air induction nozzles and Dampers) d. Integral heat exchange e. On/off fan control

18、 f. Variable speed fan control g. Integral Diffuser Air Terminals 2.2 Exclusions. This standard does not apply to registers, diffusers and grilles or to products specifically covered by ARI Standard 410 or ARI Standard 440. Section 3. Definitions All terms in this document follow the standard indust

19、ry definitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air Conditioning, and Refrigeration unless otherwise defined in this section. 3.1 Acoustically Isolated. The specimen under test shall have a sound pressure level at least 10 dB higher than any extraneous sound sour

20、ces, such as sound generated from the air supply or duct walls, to insure that the test specimen is the sole contributor to the sound level being measured. 3.2 Air. 3.2.1 Primary Air. Air supplied to an air terminal inlet under positive static gage pressure, normally from an air handling unit. 3.2.2

21、 Secondary Air. Air drawn into an Air Terminal by means of induction and discharged through the air terminal outlet. 3.2.3 Standard Air. Air weighing 0.075 lb/ft3 1.2 kg/m3 which approximates dry air at 70F 21C and at a barometric pressure of 29.92 in Hg 101.3 kPa. 3.3 Airflow. Unit volume displacem

22、ent of standard air per unit time, cfm m3/s. The various types of airflow are defined as follows: 3.3.1 Induced Airflow. The flow of secondary air into an Air Terminal resulting from a pressure differential within the terminal. Copyright Air-Conditioning, Heating and Refrigeration Institute Provided

23、 by IHS under license with ARI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 880-2008 2 3.3.2 Rated Airflow. The flow of air through an Air Terminal at which test or performance data is generated. 3.3.3 Standard Airflow. Airflow corrected for standar

24、d air density. Qs = Qa (a/s) 3.4 Air Terminal (Terminal). A device that modulates the volume of air delivered to or removed from a defined space in response to an external demand (Figure 1). The various types of Air Terminals are: 3.4.1 Bypass Air Terminal. Air Terminal, typically having more than o

25、ne outlet, that uses a method of volume modulation whereby airflow is varied by distributing that volume required to meet the space requirements with the balance of primary air being diverted away from the space. 3.4.2 Dual Duct Air Terminal. Air Terminal that mixes varying portions of two independe

26、nt sources of primary air. 3.4.3 Induction Air Terminal. Air Terminal, typically having more than one inlet, that supplies varying proportions of primary and induced air (excludes Fan-Powered Terminals). 3.4.4 Integral Diffuser Air Terminal. Diffuser with the features of an Air Terminal. Air is modu

27、lated via outlet or inlet dampers. 3.4.5 Modulating Diffuser Air Terminal. A diffuser with an integral Air Terminal. 3.4.6 Fan-Powered Air Terminal. 3.4.6.1 Booster Fan-Powered Air Terminal. Air Terminal similar to a series terminal unit without a primary valve. Unit may have supplemental heat or re

28、heat. 3.4.6.2 Parallel Flow Fan-Powered Air Terminal. Air Terminal in which the primary air valve is parallel to the fan allowing the primary air to bypass the fan. The fan induces airflow only through the induction port. Unit may have supplemental heat or cooling. 3.4.6.3 Series Flow Fan-Powered Ai

29、r Terminal. Air Terminal in which the primary air valve is in series with the fan and typically all air flows through the fan. The fan induces airflow from the induction port and the primary air valve. Unit may have supplemental heat or cooling. 3.4.7 Single-Duct Air Terminal. Air Terminal supplied

30、with one source of primary air (excludes Fan-Powered Terminals). Unit may have supplemental heat. 3.4.7.1 Reheat Air Terminal. Air Terminal that heats a single source of primary air from a cooling and/or dehumidification source. 3.4.7.2 Exhaust Air Terminal. Air Terminal for regulating exhaust or re

31、turn. 3.5 Damper. A device used to regulate or modulate the flow of air. 3.5.1 Inlet Damper. Controls all air flowing into an Integral Diffuser Air Terminal. 3.5.2 Outlet Damper. Controls only the air being discharged through the diffuser part of an Integral Diffuser Air Terminal. 3.6 Equivalent Dia

32、meter. Diameter of a circular equivalent of any duct used to determine equal cross-sectional areas. 3.7 Model. An Air Terminal of the same type with similar characteristics available in a progression of sizes. For Fan-Powered Air Terminals, a model is defined by a fan size and a progression of vario

33、us inlet dimensions. For non-Fan-Powered Air Terminals, it is an Air Terminal of various inlet dimensions. 3.8 Octave Band. A band of sound covering a range of frequencies such that the highest is twice the lowest. The octave band center frequencies of interest are listed in Table 1: Copyright Air-C

34、onditioning, Heating and Refrigeration Institute Provided by IHS under license with ARI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 880-2008 3 Table 1. Octave Band Center Frequencies Octave Band Center Frequency (Hz) 2 125 3 250 4 500 5 1000 6 2000

35、 7 4000 3.9 Piezometric Ring. A duct static pressure averaging apparatus in which a common tube interconnects at least four evenly spaced duct wall taps and is connected to a pressure measuring device. 3.10 Power Factor. The ratio of real power to apparent power. Power Factor is a way to describe ho

36、w much of the current contributes to power in the load. A Power Factor of one indicates that 100% of the current is contributing to power in the load. 3.11 Pressure. For the purpose of this standard, pressure shall be associated with standard air. 3.11.1 Minimum Operating Pressure. The static pressu

37、re drop through an Air Terminal at a given airflow rate with the damper/valve placed in its full open position by its actuator in its normal operating mode. 3.11.2 Pressure Compensated Control System. Airflow through the Air Terminal is independent of system pressure. 3.11.3 Pressure Dependent Contr

38、ol System. Airflow through the Air Terminal varies in response to system pressure. 3.12 Published Rating. A rating of the assigned values of those performance characteristics, under stated Rating Conditions, by which a unit may be chosen to fit its application. These values apply to all units of lik

39、e nominal size and type (identification) produced by the same manufacturer. As used herein, the term Published Rating includes the rating of all performance characteristics shown on the unit or published in specifications, advertising or other literature controlled by the manufacturer, at stated Rat

40、ing Conditions. 3.12.1 Application Rating. A rating based on tests performed at application Rating Conditions (other than Standard Rating Conditions). 3.12.2 Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.12.3 Certification. A manufacturer participating in an ARI

41、 performance certification program shall use the designation ARI Performance Certified Ratings. 3.13 Quiet Air Supply. Condition in which the Sound Power Level introduced in the frequency band of interest by the air supply alone is at least 10 dB lower than the measured Sound Power Level generated b

42、y the air supply and the Air Terminal under test. 3.14 Rating Conditions. Any set of operating conditions under which a single level of performance results, and which causes only that level of performance to occur. 3.14.1 Standard Rating Conditions. Rating Conditions used as the basis of comparison

43、for performance characteristics. 3.15 Retrofit Unit. Air Terminal intended for installation into existing air distribution systems, and containing little or no sound attenuating materials. Copyright Air-Conditioning, Heating and Refrigeration Institute Provided by IHS under license with ARI Not for

44、ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 880-2008 4 Figure 1. Air Terminal and Air Outlet Configuration Copyright Air-Conditioning, Heating and Refrigeration Institute Provided by IHS under license with ARI Not for ResaleNo reproduction or networking pe

45、rmitted without license from IHS-,-,-ARI STANDARD 880-2008 5 3.16 “Shall“ or “Should.“ “Shall“ or “should“ shall be interpreted as follows: 3.16.1 Shall. Where “shall“ or “shall not“ is used for a provision, that provision is mandatory if compliance with the standard is claimed. 3.16.2 Should. “Shou

46、ld“ is used to indicate provisions which are not mandatory but are desirable as good practice. 3.17 Size. Air Terminal characteristics related to the dimensions of the unit. 3.18 Sound Power. In a specified frequency band, the rate at which sound energy is radiated by a noise source, watts. 3.18.1 D

47、ischarge Sound Power. Sound Power transmitted from an air terminal outlet. 3.18.2 Radiated Sound Power. Sound Power transmitted from an air terminal casing (plus induction port for Fan-Powered Air Terminals). 3.19 Sound Power Level, Lw. Ten times the logarithm to the base ten of the ratio of the Sou

48、nd Power radiated by the source to a reference Sound Power, expressed in decibels, (dB). The reference Sound Power used in this standard is 1 picowatt (pW). 3.20 Sound Pressure. In a specified frequency band, a fluctuating pressure superimposed on the static pressure by the presence of sound. 3.21 S

49、ound Pressure Level (Lp). Twenty times the logarithm to the base ten of the ratio of the Sound Pressure radiated by the noise source under test to a reference sound pressure of 20 micropascals, dB. Section 4. Symbols 4.1 Symbols. The symbols used throughout this standard are shown in Table 2. Table 2. Symbols Symbol Quantity I - P Unit