1、 4301 NORTH FAIRFAX DRIVE ! ARLINGTON, VIRGINIA 22203 2001 STANDARD for SOUND RATING OF LARGE OUTDOOR REFRIGERATING AND AIR-CONDITIONING EQUIPMENT Standard 370 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking per
2、mitted without license from IHS-,-,-Price $15.00 (M) $30.00 (NM) Copyright 2001, by Air-Conditioning and Refrigeration Institute Printed in U.S.A. Registered United States Patent and Trademark Office IMPORTANT SAFETY RECOMMENDATIONS It is strongly recommended that the product be designed, constructe
3、d, assembled and installed in accordance with nationally recognized safety requirements appropriate for products covered by this standard. ARI, as a manufacturers trade association, uses its best efforts to develop standards employing state-of-the-art and accepted industry practices. However, ARI do
4、es not certify or guarantee safety of any products or systems designed, tested, rated, installed or operated in accordance with these standards or that any tests conducted under its standards will be non-hazardous or free from risk. Note: This standard supersedes ARI Standard 370-86. Note: This vers
5、ion of the standard differs from that of 1986 in the following ways: a. The single number, A-Weighted, sound rating level (SR) in bels has been replaced by a rating comprised of three sound level descriptors, all expressed in decibels: Octave Band Sound Power Levels, dB A-Weighted Sound Power Level,
6、 dB Tone Adjusted, A-Weighted Sound Power Level, dB One-Third Octave Band Sound Power Levels, dB (optional) b. The frequency range of interest has been expanded to include the 63 Hz Octave Band c. All sound levels are determined from One-Third Octave Band measurements d. In addition to a sound ratin
7、g for the complete unit, the scope of the rating has been expanded to include sound levels for fan only operation as well e. A new test procedure is specified for determining Sound Power Levels based upon measurements of sound pressure in an essentially free-field f. The area of equivalent hemispher
8、e is used to ensure closure between Sound Power Levels obtained using reverberation room and survey methods. Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Air-C
9、onditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE OF CONTENTS SECTION PAGE Section 1. Purpose .1 Section 2. Scope 1 Section 3. Definitions 1 Section 4. Test Requirements2 Section 5. R
10、ating Requirements 3 Section 6. Minimum Data Requirements for Published Ratings.4 Section 7. Marking and Nameplate Data.5 Section 8. Conformance Conditions5 TABLES Table 1. A-Weighting Adjustments3 APPENDICES Appendix A. References - Normative .6 Appendix B. References - Informative6 Appendix C. Det
11、ermining Sound Power Levels Using Sound Pressure Measurements Made in a Free Field Over a Reflecting Plane - Normative 7 Appendix D. Tone Adjustments at One-Third Octave Band Frequencies for Specific Values of Projection (P) - Informative.10 Appendix E. Example Calculation of A-Weighted Sound Power
12、Level - Informative.11 Appendix F. Example Calculation of Tone Adjusted, A-Weighted Sound Power Levels - Informative12 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE
13、S FOR APPENDICES Table D1. One-Third Octave Band Adjustments for Tone Response.10 Table E1. Example Calculation of A-Weighted Sound Power Level.11 Table F1. Example Calculation of Tone Adjusted, A-Weighted Sound Power Level .12 FIGURES FOR APPENDICES Figure C1. Plan View of Measurement Parallelepipe
14、d 8 Figure C2. Elevation of Measurement Parallelepiped8 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Air-Conditioning and Refrigeration Institute Provided by I
15、HS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 370-2001 1SOUND RATING OF LARGE OUTDOOR REFRIGERATING AND AIR-CONDITIONING EQUIPMENT Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish methods for deter
16、mining the sound ratings of the outdoor portions of factory-made commercial and industrial Large Outdoor Refrigerating and Air-Conditioning Equipment. It establishes definitions; test requirements; rating requirements; minimum data requirements for Published Ratings; marking and nameplate data; and
17、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 technology advances. Section 2. Scope 2.1 Scope. Th
18、is standard applies to the outdoor portions of factory-made commercial and industrial Large Outdoor Refrigerating and Air-Conditioning Equipment, including heat pumps, used for refrigerating or air-conditioning of spaces, as defined in Section 3 of this standard. 2.2 Exclusions. This standard does n
19、ot apply to the outdoor portions of unitary air-conditioning or heat pump equipment which fall within the scope of ARI Standard 270 (cooling capacity ratings of less than 135,000 Btu/h 40 kW) nor does it apply to air or evaporatively cooled condensers that fall within the scope of ARI Standards 460
20、and 490. Section 3. Definitions All terms in this document shall follow the standard industry definitions established in the current edition of ASHRAE Terminology of Heating, Ventilation, Air-Conditioning and Refrigeration, unless otherwise defined in this section. 3.1 Comparison Method. A method of
21、 determining Sound Power Level of the equipment under test in a reverberation room by comparing the average Sound Pressure Level of that equipment to the average Sound Pressure Level of a Reference Sound Source of known Sound Power Level output. The difference in Sound Power Level is equal to the di
22、fference in Sound Pressure Level when conditions in the room are the same for both sets of measurements. 3.2 Hertz (Hz). A unit of frequency equal to one cycle per second. 3.3 Large Outdoor Refrigerating and Air-Conditioning Equipment. Equipment that consists of one or more assemblies, including an
23、outdoor coil and outdoor fan, and which may include a compressor. Remote, mechanical-draft, air-cooled and evaporative refrigerant condensers are not included. 3.4 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 st
24、andard are those defined in ANSI Standard S1.11. 3.5 One-Third Octave Band. A band of sound covering a range of frequencies such that the 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. 3.6 Publish
25、ed Rating. A statement 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 like nominal size and type (identification) produced by the same manufacturer. As used herein,
26、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 rating conditions. 3.6.1 Application Rating. A rating based on tests performed at Application R
27、ating Conditions (other than Standard Rating Conditions). 3.6.2 Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.7 Rating Conditions. Any set of operating conditions under which a single level of performance results, and which cause only that level of performance t
28、o occur. 3.7.1 Standard Rating Conditions. Rating Conditions used as the basis of comparison for performance characteristics. 3.8 Reference Sound Source (RSS). A portable, aerodynamic sound source that produces a known stable broad band sound power output. Copyright Air-Conditioning and Refrigeratio
29、n Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 370-2001 _ 2 3.9 “Shall“ or “Should“. “Shall“ or “should“ shall be interpreted as follows: 3.9.1 Shall. Where “shall“ or “shall not“ is used for a provisi
30、on specified, that provision is mandatory if compliance with the standard is claimed. 3.9.2 Should. “Should“ is used to indicate provisions which are not mandatory but which are desirable as good practice. 3.10 Sound Power Level, Lw. This is ten times the logarithm to the base ten of the ratio of th
31、e sound 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). 3.10.1 A-Weighted Sound Power Level, LWA. The logarithmic summation of A-Weighted, One-Third Octave Band levels 3.11 Sound Pressure Level, L
32、p. This is twenty times the 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. 3.12 Tone. For the purposes of this standard, a tone is considered to exist within a One-Third Octave Band when the sound level in that ban
33、d exceeds the average of the levels of the two adjacent bands by 2 dB or more. 3.13 Tone Adjustment. An adjustment made to the One-Third Octave Band data to account for the subjective response to the presence of tones. Section 4. Test Requirements 4.1 Test Requirements. All standard Sound Power Leve
34、l ratings shall be determined by tests conducted in a qualified reverberation room, anechoic or hemianechoic room, or an indoor or outdoor space that is an essentially free field over a reflecting plane. 4.1.1 Sound tests conducted in a reverberation room shall use the Comparison Method in accordanc
35、e with ISO 3741, using a Reference Sound Source calibrated in a hemi-anechoic environment in accordance with ARI Standard 250. a. The room shall be qualified for measuring sound containing pure tone components in accordance with ISO 3741, Annex A b. Qualification to the 63 Hz Octave Band shall be in
36、 accordance with ARI Standard 280 c. The volume of the equipment to be tested shall not exceed 5% of the volume of the room d. The instrumentation and instrumentation systems employed in reverberation room testing shall meet or exceed the requirements of ISO 3741. 4.1.2 Sound tests in a hemi-anechoi
37、c room which affords a free field condition above the measurement space or above a reflecting plane shall be conducted in accordance ISO 3745, as adapted for Large Outdoor Refrigerating and Air-Conditioning Equipment in Appendix C of this standard. 4.1.3 Sound tests in indoor or outdoor spaces that
38、qualify as an essentially free field over a reflecting plane shall be conducted in accordance with ISO 3744, as adapted for Large Outdoor Refrigerating and Air-Conditioning Equipment in Appendix C of this standard. 4.2 Methods of Test. Sound tests shall be conducted as prescribed below: 4.2.1 Standa
39、rd Sound Ratings. Standard sound ratings shall be based on sound tests conducted with the unit operating at rated voltage, V, phase and frequency, Hz, as specified on the unit nameplate and measured at the service connection. The tests shall consist of two phases: a. In the first phase, the sound me
40、asurements shall be made with the equipment operating at the ARI standard thermal rating condition b. In the second phase, the compression equipment shall be turned off and sound readings taken with only the fans operating. During this phase, the temperature of the ambient air entering the unit shal
41、l be within 2.0 F 1.1 C of the temperature measured during compressor operation. 4.2.2 Application Sound Ratings. Application Sound Ratings for conditions other than the ARI standard thermal rating condition shall be based on sound tests conducted with the equipment operating at those conditions. 4.
42、2.3 Test Condition Tolerances. During sound rating tests, the equipment operating conditions shall not deviate from the specified operating conditions by more than the following tolerances: Air Temperature 2.0F 1.1C Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license
43、 with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 370-2001 3When the indoor-side loading is simulated by a method not requiring air, the following tolerances apply: Suction gas temperature at compressor 5.0F 2.8C Evaporator pressure 2.0 psi 14 k
44、Pa The suction gas superheat must be at least 10F 5.6C in the equivalent Standard Rating test specified in the ARI Standard for the equipment being tested. 4.3 Data to be Taken. Sound data shall be measured and recorded in One-Third Octave Bands (50 to 10,000 Hz) in accordance with the procedure spe
45、cified above for the type of test being conducted. 4.4 Air Velocity at Measurement Positions. Sound measurements shall not be made when the air velocity over the microphone exceeds 1,056 ft/min 5.4 m/s. A foam windscreen shall be installed on the microphone which shall not affect the microphone resp
46、onse by more than 1 dB for frequencies of 20 to 4,000 Hz or 1.5 dB for frequencies above 4,000 Hz. Section 5. Rating Requirements 5.1 Introduction. The sound rating shall include two sets of Sound Power Levels, one for the complete unit and one for the unit operating with fans only. Each set shall b
47、e comprised of: Octave Band Sound Power Levels (Lw); an A-Weighted Sound Power Level (LWA); a Tone Adjusted A-Weighted Sound Power Level (LWAT); and optionally, One-Third Octave Band Sound Power Levels. 5.2 Determination of Sound Power Levels. All Sound Power Levels, including Octave Band, A-Weighte
48、d, and Tone Adjusted A-Weighted, shall be computed from the non-rounded, measured One-Third Octave Band data. 5.2.1 Octave Band Sound Power Levels. Octave Band Sound Power Levels shall be determined from the One-Third Octave Band Sound Power Levels by logarithmically summing the three One-Third Octave Bands comprising each Octave Band (Equation 1). The resulting sound power values shall be expressed in dB re 1 pW for each band, to the nearest 1.0 dB. =3110.010)(10log10nLWnWL 1 where: LW= Octave B
