AHRI 350-2008 Sound Performance Rating of Non-Ducted Indoor Air-Conditioning Equipment.pdf

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1、 2008 Standard for Sound Performance Rating of Non-Ducted Indoor Air-Conditioning Equipment ANSI/AHRI Standard 350 (Formerly ARI Standard 350) Price $10.00 (M) $20.00 (NM) Copyright 2008, by Air-Conditioning, Heating, and Refrigeration Institute Printed in U.S.A. Registered United States Patent and

2、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, rated, installed or operated in accordance with this standard/guideline. It is strongly recommended that products be d

3、esigned, constructed, assembled, installed and operated in accordance with nationally recognized safety standards and code requirements appropriate for products covered by this standard/guideline. AHRI uses its best efforts to develop standards/guidelines employing state-of-the-art and accepted indu

4、stry practices. AHRI does not certify or guarantee that any tests conducted under its standards/guidelines will be non-hazardous or free from risk. Note: This standard supersedes ARI Standard 350-2000 and differs in the following ways. a. Published Ratings include the following: Octave band Sound Po

5、wer Levels, dB (125 Hz to 8,000 Hz are required, 63 Hz is optional) Overall A-Weighted Sound Power Level, dB (100 Hz to 10,000 Hz are required, 50 Hz to 10,000 Hz are optional) Sound Quality Indicator (SQI) per ARI Standard 1140 (optional) One-third octave band Sound Power Levels, dB (optional) b. T

6、he frequency range of interest has been expanded to include the 63 Hz Octave Band (comprised of the 50, 63 and 80 Hz One-Third Octave Bands) as optional data. c. All Sound Power Levels are determined from one-third octave band sound pressure level measurements. d. This standard references ARI Standa

7、rd 220 for reverberation room qualification and testing, replacing ANSI Standard S12.31 and ANSI Standard S12.32, which were withdrawn. TABLE OF CONTENTS SECTION PAGE Section 1. Purpose .1 Section 2. Scope 1 Section 3. Definitions1 Section 4. Test Requirements .2 Section 5. Rating Requirements 4 Sec

8、tion 6. Minimum Data Requirements for Published Ratings 5 Section 7. Marking and Nameplate Data 6 Section 8. Conformance Conditions .6 TABLES Table 1. One-Third Octave Band Numbers and A-Weighting Factors 5 FIGURES Figure 1. Location of Equipment in the Test Room 3 APPENDICES Appendix A. References

9、Normative .7 Appendix B. References Informative .7 Appendix C. Example Calculation of Octave Band Sound Power Levels Informative .8 Appendix D. Example Calculation of A-Weighted Sound Power Levels Informative 9 Appendix E. Expected Size of Measurement Errors Informative 10 ANSI/AHRI STANDARD 350-200

10、8 TABLES FOR APPENDICES Table C1. Example Calculation of Octave Band Sound Power Levels, Lwi.8 Table D1. Example Calculation of A-Weighted Sound Power Levels, LwA.9 Table E1. Maximum Standard Deviations of Sound Power Level Reproducibility Determined in Accordance with this Standard 10 ANSI/AHRI STA

11、NDARD 350-2008 1 Sound Performance Rating of Non-Ducted Indoor Air-Conditioning Equipment Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish for Non-Ducted Indoor Air-Conditioning Equipment: definitions; test requirements; rating requirements; minimum data requirements for

12、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 and amendment as

13、technology advances. Section 2. Scope 2.1 Scope. This standard applies to the indoor portions of factory-made non-ducted air-conditioning equipment as defined in ARI Standards 210/240, 340/360, 310/380 and 440. Section 3. Definitions All terms in this document shall follow the standard industry defi

14、nitions established in the current edition of ASHRAE Terminology of Heating, Ventilation, Air-Conditioning and Refrigeration, unless otherwise defined in this section. 3.1 Hertz (Hz). A unit of frequency equal to one cycle per second. 3.2 Non-Ducted Indoor Air-Conditioning Equipment. Air-conditionin

15、g units without ducts. 3.3 Octave Band. A band of sound covering a range of frequencies such that the highest is twice the lowest. The Octave Bands used in this standard are those defined in ANSI Standard S1.11. 3.4 One-Third Octave Band. A band of sound covering a range of frequencies such that the

16、 highest frequency is the cube root of two times the lowest. The One-Third Octave Bands used in this standard are those defined in ANSI Standard S1.11. 3.5 Published Rating. A statement of the assigned values of those performance characteristics, under stated rating conditions, by which a unit may b

17、e chosen to fit its application. These values apply to all units of like 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, advert

18、ising or other literature controlled by the manufacturer, at stated rating conditions. 3.5.1 Application Rating. A rating based on tests performed at application Rating Conditions (other than Standard Rating Conditions). 3.5.2 Standard Rating. A rating based on tests performed at Standard Rating Con

19、ditions. ANSI/AHRI STANDARD 350-2008 2 3.6 Rating Conditions. Any set of operating conditions under which a single level of performance results, and which cause only that level of performance to occur. 3.6.1 Standard Rating Conditions. Rating Conditions used as the basis of comparison for performanc

20、e characteristics. 3.8 Reference Sound Source (RSS). A portable, aerodynamic sound source that produces a known stable broadband sound. 3.7 “Shall” or “Should”. “Shall” or “should” shall be interpreted as follows: 3.7.1 Shall. Where “shall” or “shall not” is used for a provision specified, that prov

21、ision is mandatory if compliance with the standard is claimed. 3.7.2 Should. “Should” is used to indicate provisions which are not mandatory but which are desirable as good practice. 3.9 Sound Power Level, Lw. Ten times the logarithm to the base ten of the ratio of the sound power radiated by the so

22、urce to a reference sound power, expressed in decibels (dB). The reference sound power used in this standard is 1 picowatt (pW). 3.9.1 A-Weighted Sound Power Level, LwA. The logarithmic summation of A-weighted, one-third octave band Sound Power Levels. 3.10 Sound Pressure Level, Lp. Twenty times the

23、 logarithm to the base ten of the ratio of a given sound pressure to a reference sound pressure of 20 Pa, expressed in decibels (dB). 3.11 Sound Quality Indicator (SQI). The calculated metric determined when following the procedure contained in ARI Standard 1140 for quantifying sound quality whereby

24、 measured sound levels are weighted to adjust for psychoacoustic sensitivity to frequency distribution and any discreet tones which may be present and then converted to a single number Sound Quality Indicator. Section 4. Test Requirements 4.1 Test Requirements. All standard sound power level ratings

25、 shall be determined by tests conducted in a reverberation room meeting the requirements of and qualified in accordance with ARI Standard 220 except as noted within the body of this standard. Sound Power Levels for the unit under test shall be determined per ARI Standard 220. A Reference Sound Sourc

26、e (RSS) shall be used that meets the performance requirements and is calibrated per ARI Standard 250. Sound data taken shall be per ARI Standard 220 in One-Third Octave Bands (100 Hz to 10,000 Hz are required, 50 Hz to 80 Hz are optional) in accordance with the procedure specified above for the type

27、 of test being conducted. A record shall be made of the actual equipment thermal rating conditions under which the equipment was tested. In addition, the equipment volumetric flow rate (cfm) m3/s and external static pressure, (inches of water gage) kPa gage shall be noted. 4.2 Mounting of Equipment

28、for Testing. Equipment shall be mounted in a way that is representative of a design application of the product. 4.2.1 Position A (Figure 1) Mounted away from wall. 4.2.2 Position B (Figure 1) Mounted against or through the wall with the bottom of equipment on the floor. The equipment shall be mounte

29、d at the minimum manufacturers recommended projection into the room. 4.2.3 Position C (Figure 1) Mounted against or through the wall but the bottom of equipment is not on the floor. The equipment shall be mounted at the minimum manufacturers recommended projection into the room. 4.2.4 Position D (Fi

30、gure 1) Ceiling mounted equipment may be suspended from the sound room ceiling or from a frame device or mounted on rails supported by concrete blocks. ANSI/AHRI STANDARD 350-2008 3 4.2.5 All equipment shall be mounted according to the manufacturers installation instructions. If any deviations from

31、these instructions are necessary, they shall be done in a manner that will not affect the acoustic performance of the equipment. A = Location for equipment used away from a wall B = Location for equipment used against or through the wall on the floor C = Location for equipment mounted against or thr

32、ough a wall D = Location for equipment suspended or fastened to ceiling X = 5.0 ft 1.5 m minimum to adjoining room surfaces(s) other than mounting plane Y = Manufacturers recommended minimum Figure 1. Location of Equipment in the Test Room 4.2.6 In the case of wall-mounted equipment, the mounting wa

33、ll shall be a heavy masonry or equivalent construction, or auxiliary mounting platform shall be provided, to minimize wall vibration effects. 4.2.7 Room fan coil air-conditioners designed for furred-in application or for application with minimal duct work shall be installed in accordance with Positi

34、on A, B or D (see Figure 1) and operated at free-delivery conditions without enclosures or ductwork. 4.2.8 Electrical Characteristics. Tests shall be performed at the rated voltage(s), phase and frequency specified on the unit nameplate, and measured at the unit service connection. 4.2.9 Air Quantit

35、y. The volumetric flow rate of both indoor and outdoor fans (if any) shall be the same as required to produce the rated capacity under the appropriate ARI standard. 4.2.10 Operation. All components required to produce the standard rating cooling capacity under the appropriate ARI standard shall be o

36、perated while data is being taken. Standard Rating Conditions (cooling) for the appropriate standard shall be maintained. 4.2.10.1 For free-delivery air-source heat pumps rated under ARI Standards 210/240 and 310/380, the heating mode shall also be used to sound rate this equipment using the followi

37、ng conditions: 70 F 21 C indoor dry bulb 65 F 18 C outdoor dry bulb 55 F 13 C outdoor wet bulb ANSI/AHRI STANDARD 350-2008 4 4.2.10.2 Room fan-coil air-conditioners rated per ARI Standard 440 shall be tested without water circulating through the coil. 4.2.11 Test Condition Tolerances. The allowable

38、tolerances for sound ratings are as follows: Air temperature 2.0 F 1.1 C Water temperature 2.0 F 1.1 C When the indoor-side loading is simulated by a method not requiring air, the following tolerances apply: Suction gas temperature at compressor* 5.0 F 2.8 C Evaporator pressure 2.0 psi 14 kPa * Appl

39、icable only when the suction gas superheat is at least 10 F 5.6 C in the equivalent Standard Rating test specified in the ARI standard for the equipment being tested. Section 5. Rating Requirements 5.1 Introduction. The sound ratings shall be comprised of: Octave band Sound Power Levels, (Lw), dB (1

40、25 Hz to 8,000 Hz are required, 63 Hz is optional) Overall A-Weighted Sound Power Level, (LwA), dB (100 Hz to 10,000 Hz are required, 50 Hz to 10,000 Hz are optional) Sound Quality Indicator (SQI) per ARI Standard 1140 (optional) One-third octave band Sound Power Levels, dB (optional) 5.2 Determinat

41、ion of Sound Power Levels. One-Third Octave Band Sound Power Levels for the unit under test shall be determined per ARI Standard 220. 5.2.1 Octave Band Sound Power Level Calculations. Octave band sound power level calculations shall be made per Equation 1. ( )wj3i0.1 Lwij=3i-2L = 10 log 101 Where: w

42、iL= Sound Power Level in the ithOctave Band wjL = Sound Power Level in the jthOne-third octave band j = An integer number lying within the range (3i 2) and 3i, and which identifies the three One-Third Octave Bands (see Table 1) which make up the ithOctave Band. Each octave band Sound Power Level sha

43、ll be rounded to the nearest decibel. An example of the calculation procedure is provided in Appendix D. 5.2.2 A-Weighted Sound Power Level. The A-Weighted Sound Power Level shall be calculated per Equation 2. maxjwjminj0.1(L +C )wAj=jL = 10 log 102 Where: wAL = A-Weighted Sound Power Level wjL = So

44、und Power Level in the jthOne-Third Octave Band ANSI/AHRI STANDARD 350-2008 5 jCand j= Values given in Table 1 jminand jmax= Values given in Table 1 of j corresponding, respectively, to the lowest (jmin) and highest (jmax) One-Third Octave Bands of measurement Table 1. One-Third Octave Band Numbers

45、and A-Weighting Factors Band Number (j)One-Third Octave Band Center FrequencyA-Weighting Factor (Cj)Band Number (j)One-Third Octave Band Center FrequencyA-Weighting Factor (Cj)Band Number (j)One-Third Octave Band Center FrequencyA-Weighting Factor (Cj)Band Number (j)One-Third Octave Band Center Freq

46、uencyA-Weighting Factor (Cj)1 50 -30.2 7 200 -10.9 13 800 -0.8 19 3150 1.22 63 -26.2 8 250 -8.6 14 1000 0.0 20 4000 1.03 80 -22.5 9 315 -6.6 15 1250 0.6 21 5000 0.54 100 -19.1 10 400 -4.8 16 1600 1.0 22 6300 -0.15 125 -16.1 11 500 -3.2 17 2000 1.2 23 8000 -1.16 160 -13.4 12 630 -1.9 18 2500 1.3 24 1

47、0000 -2.5The A-Weighted Sound Power Level shall be rounded to the nearest decibel. An example of the calculation procedure is provided in Appendix E. 5.3 Sound Quality Indicator Calculation (Optional). If the Sound Quality Indicator of the outdoor unit is to be determined the procedures in ARI Stand

48、ard 1140 shall be used. The SQI can be used for both full unit operation and fan(s) only operation. 5.4 Rating Tolerances. Any indoor unitary equipment tested in accordance with this standard shall have Octave Band Sound Power Levels (Lw)and an Overall A-Weighted Sound Power Level (LwA), shall be hi

49、gher than their Published Ratings. An optional Sound Quality Indicator (SQI) or optional one-third octave band Sound Power Levels can be determined, none of which are higher than its Published Rating. (Refer to Appendix E) Section 6. Minimum Data Requirements for Published Ratings 6.1 Published Ratings. Published sound power ratings shall be for the unit with all components running that are necessary to produce the ARI standard thermal rating. The sound power ratings shall include items 1