AHRI 270-2015 Sound Performance Rating of Outdoor Unitary Equipment (Addendum 1 March 2016).pdf

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1、 2015 Standard for Sound Performance Rating of Outdoor Unitary Equipment AHRI Standard 270 AHRI STANDARD 270-2015 WITH ADDENDUM 1, Sound Performance Rating of Outdoor Unitary Equipment March 2016 Note: This addendum is not ANSI approved and is currently going through the process to become so. Addend

2、um 1 (dated March 2016) of AHRI Standard 270-2015, “Changes to AHRI Standard 270-2015” is provided as follows. The following changes have been incorporated (deletions are shown by strikethroughs, additions are shown by shading) into the already published 2015 version of AHRI Standard 270 to avoid co

3、nfusion. The changes include: 1) The last sentence of Section 4.3.2 was removed. 4.3.2 Outdoor-side Air Quantity. All tests shall be made at the outdoor-side air quantity specified by the manufacturer where the fan drive is adjustable, or, where the fan drive is direct-connected, they shall be deter

4、mined at the outdoor air quantity inherent to the unit when operated with all of the air resistance elements associated with inlet louvers and any duct work and attachments normally supplied as part of the unit. Once established, the outdoor air circuit shall remain unchanged for all tests prescribe

5、d herein, except for the reduced ambient conditions operation (Refer to Section 5.5). 2) Edits to the second paragraph of Section 4.3.3. For convenience, the standard (cooling) condition temperatures the sound test temperatures for Unitary Air-conditioners, VRF systems and Air-source Unitary Heat Pu

6、mps are listed below. 3) Edits to Section 5.1.2. 5.2.1 Overall A-weighted Sound Power Level, LwA, dB (100 Hz to 10,000 Hz are required, 50 Hz to 10,000 Hz are optional)Overall A-weighted Sound Power Level, LwA, dB covering the range of 100 Hz to 10,000 Hz (or optionally from 50 Hz to 10,000 Hz) 4) S

7、ection 5.5 was removed. 5.5 Reduced Ambient Conditions Operation. For those units designed to automatically operate with lower noise levels during reduced ambient conditions, Standard Ratings shall also be determined with the unit operating at these lower sound levels per Section 4.3, except that th

8、e temperature entering and surrounding the outdoor portion of the unit shall be 26.5C dry-bulb (and 19.5C wet bulb when condensate is rejected to the air stream). Price $10.00 (M) $20.00 (NM) Copyright 2015, by Air-Conditioning, Heating, and Refrigeration Institute Printed in U.S.A. Registered Unite

9、d 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, rated, installed or operated in accordance with this standard/guideline. It is strongly recommende

10、d 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/guideline. AHRI uses its best efforts to develop standards/guidelines employing state-of-the-a

11、rt 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. Note: This standard supersedes AHRI Standard 270-2008. Foreword This standard references the sound intensity test method defined in

12、ANSI/AHRI Standard 230, as an alternate method of test to the reverberation room test method defined in ANSI/AHRI Standard 220 for determination of sound power ratings. TABLE OF CONTENTS SECTION PAGE Section 1. Purpose 1 Section 2. Scope . 1 Section 3. Definitions . 1 Section 4. Test Requirements .

13、3 Section 5. Rating Requirements . 5 Section 6. Minimum Data Requirements for Published Ratings 6 Section 7. Marking and Nameplate Data . 7 Section 8. Conformance Conditions. 7 TABLES Table 1. Reproducibility in the Determination of Non-ducted Equipment Sound Power Levels5 APPENDICES Appendix A. Ref

14、erences Normative 8 Appendix B. References Informative 10 AHRI STANDARD 270-2015 1 SOUND PERFORMANCE RATING OF OUTDOOR UNITARY EQUIPMENT Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish for outdoor unitary equipment: definitions; test requirements; rating requirements; mi

15、nimum data 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

16、 to review and amendment as technology advances. Section 2. Scope 2.1 Scope. This standard applies to the outdoor sections of factory-made air-conditioning and heat pump equipment as defined in ANSI/AHRI Standard 210/240, ANSI/AHRI Standard 340/360 (cooling capacity ratings of equal to or less than

17、40.0 kW), ANSI/AHRI Standard 1230, ANSI/AHRI Standard 1160 (I-P), and ANSI/AHRI Standard 1161 (SI). Products covered include: Air-source Unitary Heat Pumps, Heat Pump Pool Heaters, Unitary Air-conditioners and Variable Refrigerant Flow (VRF) Systems. Section 3. Definitions All terms in this document

18、 will follow the standard industry definitions in the ASHRAE Terminology website (https:/www.ashrae.org/resources-publications/free-resources/ashrae-terminology) unless otherwise defined in this section. 3.1 Air-source Unitary Heat Pump. One or more factory-made assemblies which normally include an

19、indoor conditioning coil(s), compressor(s), and outdoor coil(s), including means to provide a heating function. They shall provide the function of air heating with controlled temperature and may include the functions of air-cooling, air-circulating, air-cleaning, dehumidifying or humidifying. When s

20、uch equipment is provided in more than one assembly, the separated assemblies shall be designed to be used together, and the requirements of rating outlined in the standard are based upon the use of matched assemblies. 3.2 Heat Pump Pool Heater. A factory-made assembly, which contains the air moving

21、 device, compressor, refrigerant-to-water heat exchanger and air-to-refrigerant heat exchanger using ambient air as the heat source. They shall provide the function of heating pool water to achieve a controlled temperature, but may include the functions of pool water cooling, air-heating, air coolin

22、g, air-circulating, air-cleaning, or dehumidifying. Models may consist of more than one assembly to be used together for the purpose of cooling and heating air. Models with separated assemblies shall be designed to be used together, and the requirements of rating outlined in this standard are based

23、upon the use of matched assemblies. 3.3 Hertz (Hz). A unit of frequency equal to one cycle per second. 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 standard are those defined in ANSI/ASA Standard S1.11. 3.5

24、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/ASA Standard S1.11. 3.6 Published Rating. A statement of the assigned values of

25、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 AHRI STANDARD 270-2015 2 (identification) produced by the same manufacturer. As used herein, the term Published Ratin

26、g 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 Rating Conditions (other

27、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 to occur. 3.7.1 Standard

28、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 broadband sound. 3.9 “Shall” or “Should”. “Shall” or “should” shall be interpreted as follows: 3.9

29、.1 Shall. Where “shall” or “shall not” is used for a provision 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. Ten ti

30、mes the logarithm to the base ten of the ratio of the 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-th

31、ird octave band Sound Power Levels. 3.11 Sound Pressure Level, Lp. 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 Sound Quality Indicator (SQI). The calculated metric determined when following

32、the procedure contained in ANSI/AHRI Standard 1140 for quantifying sound quality whereby 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. 3.

33、13 Unitary Air-conditioner. One or more factory-made assemblies which normally include an evaporator or cooling coil(s), compressor(s) and condenser(s). Either alone or in combination with a heating plant, the functions are to provide air-circulation, air cleaning, cooling with controlled temperatur

34、e and dehumidification, and may optionally include the function(s) of heating and/or humidifying. Where such equipment is provided in more than one assembly, the separated assemblies are to be designed to be used together, and the requirements of rating outlined in this standard are based upon the u

35、se of these assemblies in operation together. 3.14 Variable Refrigerant Flow (VRF) System. An engineered direct exchange (DX) multi-split system incorporating at least one variable capacity compressor distributing refrigerant through a piping network to multiple indoor fan coil units each capable of

36、 individual zone temperature control, through proprietary zone temperature control devices and common communications network. Variable refrigerant flow implies three or more steps of control on common, inter-connecting piping. AHRI STANDARD 270-2015 3 Section 4. Test Requirements 4.1 Test Requiremen

37、ts. All standard sound power level ratings shall be determined by tests conducted in a reverberation room or using sound intensity. 4.1.1 If the reverberation room method is used the room shall meet the requirements of and be qualified in accordance with ANSI/AHRI Standard 220 except as noted within

38、 the body of this standard. Sound Power Levels for the unit under test shall be determined per ANSI/AHRI Standard 220. A Reference Sound Source (RSS) shall be used that meets the performance requirements of and is calibrated per ANSI/AHRI Standard 250. 4.1.2 If the sound intensity method is used the

39、 test shall be conducted in accordance with ANSI/AHRI Standard 230. 4.1.3 Measured sound data shall be in One-third Octave Bands (100 Hz to 10,000 Hz are required, 50 Hz to 80 Hz are optional) in accordance with the procedures specified above for the method of test being used. 4.1.4 For packaged roo

40、ftop equipment with indoor fans, the volumetric flow rate, m3/s, and total static pressure, kPa gage, for the indoor fan(s) shall be recorded. 4.2 Unit Installation. The unit under test shall be located within the reverberation room as specified in ANSI/AHRI Standard 220. 4.2.1 Unitary Air-condition

41、ers and Air-source Unitary Heat Pumps. Where applicable, unit supply and return ducting shall be acoustically treated to prevent sound radiating from them (refer to ANSI/AHRI Standards 260 (I-P) and 261 (SI) for guidance in duct construction). In the case of wall-mounted equipment, the mounting wall

42、 shall be of heavy masonry or equivalent construction, or an auxiliary mounting platform shall be provided to minimize wall vibration effects. Care must be taken to minimize the noise radiating from the connecting refrigerant piping on split systems. 4.2.2 Heat Pump Pool Heaters and Water-source VRF

43、 Systems. The installation includes water flow through the unit. The water pipe diameter shall match the nominal diameter of the unit connection. The water pipe shall be acoustically treated so that water flow noise through the pipe does not contribute to the unit sound rating. 4.3 Unit Operation. T

44、he unit under test shall operate as specified below in Sections 4.4.1 through 4.4.5. 4.3.1 Electrical Characteristics. Tests shall be performed at the nameplate rated voltage, phase, and frequency at the unit service connection. For units with dual nameplate voltage ratings, standard sound tests sha

45、ll be performed at both voltages. The higher of the two ratings obtained shall be the AHRI standard sound rating or both ratings shall be published. 4.3.2 Outdoor-side Air Quantity. All tests shall be made at the outdoor-side air quantity specified by the manufacturer where the fan drive is adjustab

46、le, or, where the fan drive is direct-connected, they shall be determined at the outdoor air quantity inherent to the unit when operated with all of the air resistance elements associated with inlet louvers and any duct work and attachments normally supplied as part of the unit. Once established, th

47、e outdoor air circuit shall remain unchanged for all tests prescribed herein, except for the reduced ambient conditions operation (Refer to Section 5.5). 4.3.3 Unit Operation Requirements. Standard sound ratings shall be based on sound tests conducted with the unit operating at rated voltage (V), ph

48、ase, and frequency (Hz) as specified on the unit nameplate and measured at the service connection. The sound measurements shall be made with the equipment operating at the AHRI standard thermal rating conditions. All components required to produce the standard rating capacity under ANSI/AHRI Standar

49、d 210/240, ANSI/AHRI Standard 340/360, ANSI/AHRI Standard 1160 (I-P), ANSI/AHRI Standard 1161 (SI) or ANSI/AHRI Standard 1230 shall be operated while data is being taken and the test conditions shall be identical to the standard (cooling) condition temperatures specified in ANSI/AHRI Standard 210/240, ANSI/AHRI Standard 340/360, ANSI/AHRI Standard 1160 (I-P), ANSI/AHRI Standard 1161 (SI) or ANSI/AHRI Standard 1230. For convenience, the standard (cooling) condition temperatures the sound test temperatures for Unitary Air-conditioners, VRF systems and Air-sourc