1、ADDENDUM TO ARI STANDARD 260-2001 (ISSUED AUGUST 2002) A. Replace Equation 5 of Section 5.3.1 of ARI Standard 260-2001 with the following: Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without licens
2、e from IHS-,-,-2001 STANDARD for AIR-CONDITIONING requirements for acquiring mapped sound data; Sound Power Level calculations and ratings; minimum data requirements for published sound ratings; and conformance conditions. 1.1.1 Intent. This standard is intended for the guidance of the industry, inc
3、luding 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. This standard applies to all ducted air moving and conditioning equipment containing fans as defined in
4、 Section 3 of this standard. Examples of such equipment when ducted are: a. b. C. d. e. Unitary Air-Conditioners, as defiied in ARI Standard 2101240 and ARI Standard 3401360 ARI-Source Unitary Heat Pumps, as defined in ARI Standard 3401360 Water-Source Heat Pumps, as defiied in IS0 Fan-Coil Air-Cond
5、itioners, as defiied in ARI Standard 440 Central-Station Air-Handling Units, as defiied in ARI Standard 430 13256-1 2.2 Exclusions. This standard does not apply to: a. b. C. d. e. Air Control and Distribution Devices, which are covered by ARI Standard 880 Packaged Terminal Air-Conditioners , which a
6、re covered by ANSIIARI Standard 300 Outdoor sound fiom outdoor portions of Ducted Equipment that would be covered under ARI Standards 270 and 370 The sound radiated fiom ductwork attached to the fan andor equipment when such ductwork is not offered by the manufacturer as a standard part of the equip
7、ment The casing (base pan) radiated sound component for rooftop or down draft products Section 3. Definitions Ail terms in this document shall follow the standard industry defiiitions established in the current edition of ASHRAE Terminology of Heating, Ventilation, Air-Conditioning and Refrigeration
8、, unless otherwise defiied in this section. 3.1 Acoustic Test Duct. The duct used to convey the sound of the unit configuration under test to the reverberation room during a ducted discharge or the ducted inlet sound component test. A Duct End Correction (E) must be added to the sound data measured
9、in the reverberation room to account for the presence of an open-ended duct terminating in the reverberation room. 3.2 Acoustic Test Duct Elbow. An elbow added to the Acoustic Test Duct during a reverberation room test to facilitate testing. An adjustment must be made (in addition to the Duct End Co
10、rrection) to the sound data to account for the presence of the Acoustic Test Duct Elbow. Appendix D of this standard defines the Atkins sound attenuation adjustments. 3.3 Base Unit. A factory-made encased assembly consisting of one or more fans meant to be connected to a duct and other necessary equ
11、ipment to perform one or more of the functions of circulating, cleaning, heating, cooling, humidifying, and mixing of air, but which does not always include a source of heating or cooling. 3.3.1 for purposes of control, isolation, safety, static pressure regain, wear etc. Appurtenance. An addition t
12、o a Base Unit Examples of Appurtenances include: a. b. d. e. f. g- h. C. 1. Coil) 1. Cooling coil 2. Cooling and dehumidifying coil 3. Water spray (wetted coil) 4. Heating coil Electric heater( s) Air filter Dampers Moisture eliminator Fan-motor drive Gas heat exchangers Inlet or discharge plenums M
13、odulating devices in the fan inietldischarge 1 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AR1 STANDARD 260-2001 j. Application duct geometries (such as duct elbow conf
14、igurations) 3.4 Comparison Method. A method of determining Sound Power Level of a source under test in a reverberation roomby comparing the average Sound Pressure Level ofthat source to the average Sound Pressure Level of a Reference Sound Source of known Sound Power Level output. The difference in
15、Sound Power Level is equal to the difference in Sound Pressure Level when conditions in the room are the same for both sets of measurements. 3.5 Duct End Correction, E. Accounts for the acoustic energy in an Acoustic Test Duct that is reflected back towards the source. A method for computing E is de
16、fiied in 5.2.1 of this standard. 3.6 Ducted Equipment. Heating, ventilating and air- conditioning equipment having one or more supply fans. The equipment may be configured with either: a. Free inlet(s) with ducted discharge(s) b. Ducted inlet(s) with free discharge(s) c. Ducted iniet(s) and ducted d
17、ischarge(s) This equipment may be ducted in various configurations horizontally and vertically, and may incorporate multiple inlets and outlets. 3.7 Effective Diameter, D. Diameter of an Acoustic Test Duct and is equal to either the diameter, ft m, of a circular duct or the Effective Diameter, ft m,
18、 of a rectangular duct. D is given by the following expression: where: AREA = Cross-sectional area of the duct, ft2 m2 3.8 second. Hertz (Hz). A unit of frequency equal to one cycle per 3.9 (50,63 and 80 Hz One-Third Octave Bands). Low Frequency Data. Data in the 63 Hz Octave Band 3.10 Mapped Sound
19、Rating. A rating based upon tests performed across the range of operating conditions typically defined for the product supply fan map, in the Base Unit, and as defiied by the product manufacturer. These products include: a. Belt-driven products with or without variable frequency drives b. Direct-dri
20、ve products with variable frequency drives c. Direct-drive products with discrete speed taps Note: Special case -when a supply fan is used in conjunction with a return fan in the Base Unit (See Appendix E of this standard). 3.11 Octave Band. A band of sound covering a range of frequencies such that
21、the highest is twice the lowest. The Octave Bands used in this standard are those defined in ANSI Standard S 1.1 1. 3.12 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
22、 this standard are those defiied in ANSI Standard S 1.1 1. 3.13 Reference Sound Source (RSS). A portable, aerodynamic sound source that produces a known stable broad band sound power output. 3.14 Reverberation Room Technique. A technique used to derive the Sound Power Level of Ducted Equipment Sound
23、 Components. The technique utilizes an Acoustic Test Duct coupled to a reverberation room to measure the ducted inlet or ducted discharge sound. Other setup configurations allow the testing of the casing radiated or free inlet (or free discharge) combined with the casing radiated Sound Components. T
24、his technique is incorporated in AMCA Standard 300. 3.15 “Shall“ or “Should“. “Shall“ or “should“ shall be interpreted as follows: 3.15.1 Shall. Where “shall“ or “shall not“ is used for a provision specified, that provision is mandatory if compliance with the standard is claimed. 3.15.2 Should. “Sho
25、uld“ is used to indicate provisions which are not mandatory but which are desirable as good practice. 3.16 Sound Components. The various Sound Sources emanating from the product that need to be independently defiied to adequately describe a products acoustic effect on a typical application. Dependin
26、g on the configuration of the equipment the Sound Components that need to be defiied consist of several or all the following: a. Ducted discharge b. Free inlet (or free discharge) combined with casing radiated c. Casing radiated 2 Copyright Air-Conditioning and Refrigeration Institute Provided by IH
27、S under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AR1 STANDARD 260-2001 d. Ducted inlet e. Free inlet (and/or free discharge) 3.17 Sound Power Level, L,. This is ten times the logarithm to the base ten of the ratio of the sound power radiated
28、by the source to a reference sound power, expressed in decibels (dB). The reference sound power used in this standard is 1 picowatt (PW). 3.18 Sound Pressure Level, Lp. 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 VPa,
29、expressed in decibels (dB). 3.19 Sound Sources. a. Base Unit. Sound generated by the supply fan(s) in the Base Unit. b. Appurtenance. Sound generated or attenuated due to the Appurtenance having supply fan airflow through it. Other. Sound generated by an element that is not dependent on the supply f
30、an airflow of the product. The refrigerant circuit, airborne noise from a variable frequency drive (VFD) ventilation fan, motor noise due to a VFD, gas burner combustion noise, and exhaust fans are examples of Other Sound Sources. c. Section 4. Requirements for Acquiring Mapped Sound Data 4.1 Genera
31、l Overview. This standard incorporates a Reverberation Room Technique utilizing AMCA Standard 300 to obtain the Sound Power Levels of the various Sound Components for ducted air-moving and air-conditioning equipment. It goes beyond AMCA Standard 300 which is for rating fans, by adding the effects of
32、 Appurtenances and Other Sound Sources to the Base Unit to obtain the Mapped Sound Rating of a given product configuration. Sound Power Levels shall be obtained utilizing the Comparison Method and a Reference Sound Source calibrated per ARI Standard 250. The One-Third Octave Band Sound Pressure Leve
33、ls of Sound Components can be measured to obtain the Sound Power Levels required to rate each sound component of the equipment. Products having multiple ducted inlets or multiple ducted discharges on a common face that are meant by the manufacturer to join into a common duct shall be ducted into the
34、 reverberation room and tested at the same time. A Duct End Correction of only one of the ducts shall be made. However, if products have multiple ducted inlets or discharges on a common face or different faces, and are not joined into a common duct, each shall be ducted into the reverberation room a
35、nd tested separately. Duct End Corrections shall be made for each of the ducts. The three Ducted Equipment configurations addressed by this standard are equipment with: a. Free inlet) with ducted discharge(s) b. Ducted inlet(s) with free discharge(s) c. Ducted inlet(s) and ducted discharge(s) The th
36、ree equipment configurations have the following Sound Components: 4.1.1 Equipment with Free Inlet(s) and Ducted Discharge(s). The following Sound Power Levels shall be determined for this configuration: a. b. Ducted discharge c. Free inlet Free inlet combined with casing radiated Note: The free inle
37、t combined with casing radiated sound power component shall not be derived from separate free inlet and casing radiated sound tests. 4.1.2 Equipment with Ducted Inlet(s) and Free Discharge(s). The following Sound Power Levels can be determined for this configuration: a. Ducted inlet b. Casing radiat
38、ed combined with free discharge c. Free discharge Note: The free discharge combined with casing radiated sound power component shall not be derived from separate free discharge and casing radiated sound tests. 4.1.3 Equipment with Ducted Inlet(s) and Ducted Discharge(s). The following Sound Power Le
39、vels can be determined for this configuration: a. Ducted inlet b. Casing radiated c. Ducted discharge 4.2 Testing Considerations. All Ducted Equipment is acoustically described by conducting Mapped Sound Rating tests. Mapped Sound Ratings for each Sound Component of a product are obtained by first m
40、apping the supply fan in the Base Unit. The Appurtenance and Other Sound Sources are added as necessary to a supply fan sound map of the Base unit. 4.2.1 Base Unit. A sufficient number of speed curves and test points along each speed curve shall be evaluated to ensure that the difference between adj
41、acent test points does not exceed 5 dB for any given One-Third Octave Band. At a minimum, Base 3 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AR1 STANDARD 260-2001 Units
42、 shall be tested along the highest and lowest speed curves across the full operational map as specified by the manufacturer. 4.2.2 Appurtenances. A sufficient number of test data points shall be evaluated to ensure that the acoustical effect of the Appurtenance on the Base Unit is understood. The ob
43、jective ofthe test is to determine if the Appurtenance can be represented by an averaged acoustical effect or if it must be described as a function of airflow velocity. 4.2.2.1 Mechanical Air-ow Control Device. The effects of a mechanical airflow control device (excluding variable frequency drives)
44、shall be defiied as outlined in AMCA Standard 300 (Appendix G). 4.2.3 Other Sources. A sufficient number of operating conditions shall be evaluated to ensure that the acoustical effects of the Other Sound Sources on the Base Units are understood. 4.2.3.1 Refrigerant Circuit Sources. ReEgerant circui
45、t related sources are identified and defiied only in reference to the ARI thermal rating standard operation point for a given product (see Appendix E). 4.2.3.2 Exhaust and Return Fans. The effects of the exhaust and return fan Sound Source shall be evaluated at a nominal static pressure and airflow
46、specified by the manufacturer (see Appendix E). 4.2.3.3 Burners. The effects of the burner Sound Source shall be evaluated at the input rate and gas type specified on the nameplate. 4.3 utilizing a Reverberation Room Technique modeled after AMCA Standard 300. However, the specific test setup will de
47、pend on the product Sound Components being tested. Method of Test. All sound tests shall be conducted 4.3.1 Ducted Sound Components. For ducted inlet and ducted discharge components tested in accordance with AMCA Standard 300 (Section 5), the Duct End Correction (E) must be added to each One-Third O
48、ctave Band for all products. The addition of the Duct End Correction (E) provides the user with the sound power that would be transmitted into a non- reflecting duct system. Although a straight Acoustic Test Duct is preferred for ducted component tests, an Acoustic Test Duct Elbow may be used to acc
49、ommodate test facility issues. If an Acoustic Test Duct Elbow is employed, adjustments shall be added to the sound data to account for attenuation of the Acoustic Test Duct Elbow using the Atkins adjustments as given in Appendix D. 4.3.1.1 Orijce End Plate. The orifice end plate, as described in AMCA Standard 300 (Appendix Cy Section C2), shall not be used to control the Acoustic Test Duct airflow in this standard. 4.3.2 Casing Radiated Combined with a Free Inlet or Free Discharge. Ail casing radiated
