1、BRITISH STANDARDBS ISO 13347-2:2004BS 848-2.2:2004Incorporating corrigendum no. 1Industrial fans Determination of fan sound power levels under standardized laboratory conditions Part 2: Reverberant room methodICS 17.140.20; 23.120g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g4
2、0g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS ISO 13347-2:2004This British Standard was published under the authority of the Standards Policy and Strategy Committee on 25 August 2004 BSI 2006ISBN 0 580 44360 4 Nat
3、ional forewordThis British Standard was published by BSI. It is the UK implementation of ISO 13347-2:2004, incorporating corrigendum October 2006. Together with BS ISO 13347-1:2004 (BS 848-2.1:2004), BS ISO 13347-3:2004 (BS 848-2.3:2004), BS ISO 13447-4:2004 (BS 848-2.4:2004), it supersedes BS 848-2
4、:1985, which is now withdrawn.The start and finish of text introduced or altered by ISO corrigendum October 2006 is indicated in the text by CC.The UK participation in its preparation was entrusted to Technical Committee MCE/17, Industrial fans.A list of organizations represented on this committee c
5、an be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot of itself confer immunity from legal obligations.Amendments issued since pu
6、blicationAmd. No. Date Comments16790 Corrigendum No. 129 December 2006 See national forewordReference numberISO 13347-2:2004(E)INTERNATIONAL STANDARD ISO13347-2First edition2004-08-15Industrial fans Determination of fan sound power levels under standardized laboratory conditions Part 2: Reverberant
7、room method Ventilateurs industriels Dtermination des niveaux de puissance acoustique des ventilateurs dans des conditions de laboratoire normalises Partie 2: Mthode de la salle rverbrante BS ISO 133472:2004ii IS-74331 O2:(4002E) iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative refe
8、rences . 1 3 Limitations on use 2 4 Field of application . 2 5 Instrumentation . 3 6 Test method. 3 7 Acoustic environment 3 8 Test set-up and ducting 3 9 Observations . 10 10 Calculations. 10 Annex A (normative) Room qualification for sound sources with broad band sound . 12 Annex B (informative) R
9、oom qualification for sound sources with pure tones/narrow-band sound 14 Annex C (informative) Total fan sound testing with attached ducts. 18 Annex D (normative) Transmission element . 20 Bibliography . 22 BS ISO 133472:2004IS-74331 O2:(4002E) iv Foreword ISO (the International Organization for Sta
10、ndardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the righ
11、t to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International
12、Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an
13、 International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 1
14、3347-2 was prepared by Technical Committee ISO/TC 117, Industrial fans. ISO 13347 consists of the following parts, under the general title Industrial fans Determination of fan sound power levels under standardized laboratory conditions: Part 1: General overview Part 2: Reverberant room method Part 3
15、: Enveloping surface methods Part 4: Sound intensity method BS ISO 133472:2004IS-74331 O2:(4002E) vIntroduction The need for this new International Standard, ISO 13347, has been evident for some time. Whilst a number of national standards exist for the measurement of fan noise, none has received uni
16、versal acceptance nor may comparisons be readily made. Forming part of the ISO/TC 117 series of fan standards, this part of ISO 13347 deals with the determination of the fan sound power level appropriate to a particular application. In describing the test and rating procedures, numerous references a
17、re made to ISO 5801 as well as to other relevant ISO standards. This reverberant room method should be read in conjunction with ISO 13447-1 and each parts of ISO 13347 which details other methods for determining the sound power radiated by a fan in specified installation conditions as a function of
18、frequency. This part of ISO 13347 primarily deals with the determination of sound power levels of industrial fans used for ducted applications. The test procedures described in this part of ISO 13347 relate to laboratory conditions. The measurement of performance under site conditions is not include
19、d. Acoustic system effects can be considerable where the airflow into and out of the fan is not free from swirl, nor the velocity profile there fully developed. This part of ISO 13347 describes methods for determining sound power levels of fans in one-third octave bandwidths. Data obtained in accord
20、ance with this part of ISO 13347 may be used for the following purposes amongst others: a) comparison of fans which are similar in size and type; b) comparison of fans which are different in size and type; c) determining whether a fan complies with a specified upper limit of sound emission; d) scali
21、ng of fan noise from one size and speed to another size and speed; e) prediction of sound pressure level in an installation of which the fan forms a part; f) engineering work to assist in developing quiet machinery and equipment. BS ISO 133472:2004blank1Industrial fans Determination of fan sound pow
22、er levels under standardized laboratory conditions Part 2: Reverberant room method 1 Scope This part of ISO 13347 gives a detailed description of reverberant room methods for the determination of fan sound power levels. It is for use under standardized laboratory conditions and recognises that tests
23、 in situ are subject to increased uncertainty. These test procedures are not necessarily appropriate to site test conditions. Acoustic system effects are presently the subject of considerable research effort. ISO 5136, which covers the in-duct method, and ISO 10302 for small fans, should be used in
24、conjunction with this part of ISO 13347. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendm
25、ents) applies. ISO 3740:2000, Acoustics Determination of sound power levels of noise sources Guidelines for the use of basic standards ISO 3741, Acoustics Determination of sound power levels of noise sources using sound pressure Precision methods for reverberation rooms ISO 3743-1, Acoustics Determi
26、nation of sound power levels of noise sources Engineering methods for small, movable sources in reverberant fields Part 1: Comparison method for hard-walled test rooms ISO 3743-2, Acoustics Determination of sound power levels of noise sources using sound pressure Engineering methods for small, movab
27、le sources in reverberant fields Part 2: Methods for special reverberation test rooms ISO 5136, Acoustics Determination of sound power radiated into a duct by fans and other air-moving devices In-duct method ISO 5801:1997, Industrial fans Performance testing using standardized airways ISO 7235:2003,
28、 Acoustics Laboratory measurement procedures for ducted silencers Insertion loss, flow noise and total pressure loss ISO 10302:1996, Acoustics Method for the measurement of airborne noise omitted by small air-moving devices ISO 13347-1:2004, Industrial fans Determination of fan sound power levels un
29、der standardized laboratory conditions Part 1: General overview BS ISO 133472:2004IS-74331 O2:(4002E) 2 ISO 13349, Industrial fans Vocabulary and definitions of categories ISO 13350:1999, Industrial fans Performance testing of jet fans 3 Limitations on use This part of ISO 13347 is intended to apply
30、 to industrial fans as defined in ISO 5801 and ISO 13349. It is limited to the determination of airborne sound emission for the specified set-ups. Vibration is not measured, nor is the sensitivity of airborne sound emission to vibration effects determined. The size of the fan which can be tested in
31、accordance with this part of ISO 13347 is limited only by the practical aspects of the test set-up. Test fan dimensions and air performance will control the room size. (Small fans may be tested according to this standard or to ISO 10302, according to usage). The test arrangements in this part of ISO
32、 13347 establish the laboratory conditions necessary for a successful test. Rarely will it be possible to meet these requirements in situ, and this part of ISO 13347 is not intended for field measurements. Intending users are reminded that, in these situations, the acoustic environment is unlikely t
33、o meet the specified conditions and there may well be additional acoustic system effects where inlet and outlet conditions at the fan are less than ideal. 4 Field of application This part of ISO 13347 deals with the determination of the acoustic performance of industrial fans and, in addition, may b
34、e used to determine the acoustic performance of fans combined with an ancillary device such as a roof cowl or damper or, where the fan is fitted with a silencer, the sound power resulting from the fan and silencer combination. For low power fans (up to 3 kW) that could be run from a domestic power s
35、upply (single phase AC at a voltage not exceeding 250 V and a current not exceeding 16 A), reference should be made to the appropriate IEC standard for household and similar fans, IEC 60704-2-7. For reverberant field tests, the size of equipment under test is limited to less than 2 % of the room vol
36、ume. A test procedure is specified in Clause 9 of ISO 13350:1999 for testing jet fans. The test procedures specified in this part of ISO 13347 are intended principally for tests conducted using standardized test configurations and under specified environments and conditions, and may not be appropria
37、te to site test conditions. The fan installation conditions conform to the four categories of installation types specified in ISO 5801: a) type A: free inlet, free outlet; b) type B: free inlet, ducted outlet; c) type C: ducted inlet, free outlet; d) type D: ducted inlet, ducted outlet. 4.1.1 Noise
38、source The noise source is a fan. The noise measured may contain contributions from the fan drive and transmission. 4.1.2 Character of noise Steady broad band with discrete frequency tones. BS ISO 133472:2004IS-74331 O2:(4002E) 34.1.3 Uncertainty Engineering grade as defined in ISO 3740. 4.1.4 Quant
39、ities to be measured Sound pressure levels in one-third octave frequency bands at discrete microphone positions or on a prescribed path. Fan aerodynamic performance indicators including rotational speed, fan pressure and flowrate. 5 Instrumentation Full details of the instrumentation and its require
40、ments are given in ISO 13347-1. This also details the requirements for the reference sound source which shall be used to qualify the test room and shall be the basis of the substitution method. To be used for these purposes, the reference sound source (RSS) shall be of an appropriate type, be calibr
41、ated accurately and be properly maintained. 6 Test method The test method is based on a reference sound source (RSS) substitution for the determination of sound power. The reference documents for this method are ISO 3743-1 and ISO 3743-2. Application of the test method requires that the fan to be te
42、sted be set in position in a test room, which is qualified according to the requirements of Annex A. Once the test room has been qualified, sound pressure levels are recorded with the RSS operating. The fan is then operated without the RSS in operation at various performance points of interest for t
43、he given test speed, and the fan sound pressure levels are recorded. Since the sound power levels of the RSS are known, the substitution method is used to determine the sound power levels of the fan for each operating point. 7 Acoustic environment 7.1 Test environment The test environment shall be a
44、 reverberant environment. Measurements shall be taken in appropriate conditions (see Annex D of ISO 13347-1:2004). 7.2 Reverberant room An enclosure meeting the requirements of Annex A is mandatory for the purposes of this part of ISO 13347. An enclosure meeting the requirements of Annex B is recomm
45、ended for broad-band sound testing and is mandatory for the purpose of investigating pure tones and narrow bands. 8 Test set-up and ducting 8.1 Set-up categories A number of specific fan test set-ups are allowed. They are determined by the airflow direction and the particular mounting arrangement of
46、 the test device. The fan sound pressure levels are measured in a reverberant room, which may be connected to a chamber or any other system to provide control and measurement of the fan air volume flowrate. BS ISO 133472:2004IS-74331 O2:(4002E) 4 This part of ISO 13347 allows for the duct on the non
47、-measured side to be plain or fitted with a simplified anechoic termination (see ISO 13347-1). Whether an anechoic term has been fitted or not, should be clearly stated in any test report. Figure 1 shows the mounting for the determination of fan-inlet sound pressure levels and Figure 2 for the deter
48、mination of fan-outlet sound levels. Figure 3 shows the mounting for the determination of fan casing sound levels for type D installations. With this arrangement, the following different sound power levels can be measured, using the notations defined in Table 1 of ISO 13347-1:2004: LW(A,in) : free i
49、nlet, type A installation LW(A,out) : free outlet, type A installation LW(B,in + cas) : free inlet + casing, type B installation LW(B,out) : ducted outlet, type B installation LW(C,in) : ducted inlet, type C installation LW(C,out + cas) : free outlet + casing, type C installation LW(D,in + cas) : ducted inlet + casing, type D installation LW(D,out) : ducted outlet, type D installation LW(D,cas) : casing, type D installation BS ISO 133472:2004IS-74331 O2:(4002E) 5a) A: free inlet, free outlet b) B: free inlet, duct
