ISO TS 21220-2009 Particulate air filters for general ventilation - Determination of filtration performance《一般通风用颗粒空气滤清器 过滤性能测定》.pdf

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1、 Reference numberISO/TS 21220:2009(E)ISO 2009TECHNICAL SPECIFICATION ISO/TS21220First edition2009-10-01Particulate air filters for general ventilation Determination of filtration performance Filtres air particulaires pour ventilation gnrale Dtermination des performances de filtration ISO/TS 21220:20

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5、COPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address b

6、elow or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedISO/TS 21220:2009(E) ISO 2009 All rights reser

7、ved iiiContents Page Foreword. v Introduction . vi 1 Scope . 1 2 Normative references . 1 3 Terms, definitions, symbols and abbreviated terms. 2 4 Filter . 6 5 Classification/rating 6 6 Test rig and equipment 6 6.1 Test conditions . 6 6.2 Test rig . 6 6.3 DEHS test aerosol generation . 7 6.4 KCl tes

8、t aerosol generation . 10 6.5 Aerosol sampling system 12 6.6 Flow measurement . 13 6.7 Particle counter. 13 6.8 Differential pressure-measuring equipment 13 6.9 Dust feeder 13 7 Qualification of test rig and apparatus. 17 7.1 General. 17 7.2 Air velocity uniformity in the test duct . 17 7.3 Aerosol

9、uniformity in the test duct . 18 7.4 Particle counter sizing accuracy. 18 7.5 Particle counter zero test. 19 7.6 Particle counter overload test . 19 7.7 100 % efficiency test. 19 7.8 Zero % efficiency test. 19 7.9 Aerosol generator response time . 20 7.10 Correlation ratio 20 7.11 Pressure drop chec

10、king. 20 7.12 Dust feeder air flow rate. 21 7.13 Reference filter check. 22 7.14 Activity of the aerosol neutralizer . 23 7.15 Summary of qualification requirements.23 7.16 Apparatus maintenance . 24 8 Test materials 24 8.1 Test air . 24 8.2 Test aerosol. 24 8.3 Loading dust . 25 8.4 Final filter. 2

11、6 9 Test procedure 26 9.1 General. 26 9.2 Preparation of filter to be tested . 27 9.3 Initial pressure drop . 27 9.4 Initial efficiency measurement 27 9.5 Conditioning test 29 9.6 Dust loading 29 10 Uncertainty calculation of the test results . 31 ISO/TS 21220:2009(E) iv ISO 2009 All rights reserved

12、11 Test report 32 11.1 General . 32 11.2 Interpretation of test reports 32 11.3 Summary 33 11.4 Efficiency . 35 11.5 Pressure drop and air flow rate . 35 11.6 Marking. 35 Annex A (normative) Conditioning test 42 Annex B (informative) Shedding from filters . 45 Annex C (informative) Commentary 47 Ann

13、ex D (normative) Pressure drop calculation. 51 Bibliography . 53 ISO/TS 21220:2009(E) ISO 2009 All rights reserved vForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standa

14、rds 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 right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also tak

15、e part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is

16、 to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. In other circumstances, particularly

17、 when there is an urgent market requirement for such documents, a technical committee may decide to publish other types of document: an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working group and is accepted for publication if it is ap

18、proved by more than 50 % of the members of the parent committee casting a vote; an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote. An ISO

19、/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be

20、transformed into an International Standard or be withdrawn. 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/TS 21220 was prepared by Technical Co

21、mmittee ISO/TC 142, Cleaning equipment for air and other gases. ISO/TS 21220:2009(E) vi ISO 2009 All rights reservedIntroduction This Technical Specification is based on EN 7795and ANSI/ASHRAE 52.21, and covers the testing of the performance of air filters mainly used in general ventilation applicat

22、ions. During its preparation, it was perceived that the document was not sufficiently mature for publication as an International Standard, and so its publication as a Technical Specification was decided as an intermediate step. Moreover, with such a document covering the needs of the air filtration

23、industry and of the end users, it is envisaged that a future revision in the form of an International Standard could also include a classification system. The classification or rating of air filters is determined by national bodies or other associations and is not within the scope of this Technical

24、Specification In the method set out in this Technical Specification, representative samples of particles upstream and downstream of the filters are analysed by an optical particle counter (OPC) to provide filter particle size efficiency data. Initiatives to address the potential problems of particle

25、 re-entrainment, shedding and the in-service charge neutralization characteristics of certain types of media are presented. Certain types of filter media rely on electrostatic effects to achieve high efficiencies at low resistance to air flow. Exposure to some types of challenge, such as combustion

26、particles or other fine particles, can inhibit such charges, with the result that filter performance suffers. The conditioning test procedure given in Annex A provides techniques for identifying this type of behaviour and can be used both to determine whether the filter efficiency is dependent on th

27、e electrostatic removal mechanism and to provide quantitative information about the importance of the electrostatic removal. This procedure was selected because it is well established, reproducible, simple to perform and relatively quick and ultimately because an acceptable alternative procedure was

28、 not available. In an ideal filtration process, each particle would be permanently arrested at the first contact with a filter fibre, but incoming particles can impact on a captured particle and dislodge it into the air stream. Fibres or particles from the filter itself could also be released, due t

29、o mechanical forces. From the users point of view it might be important to know this, and a description is given in Annex B. A brief overview of the test method and its principles is given in Annex C. A means for calculating pressure drop is set out in Annex D. TECHNICAL SPECIFICATION ISO/TS 21220:2

30、009(E) ISO 2009 All rights reserved 1Particulate air filters for general ventilation Determination of filtration performance 1 Scope This Technical Specification presents test methods and specifies a test rig for measuring the filter performance of particulate air filters used for general ventilatio

31、n. The test rig is designed for an air flow rate of between 0,25 m3/s900 m3/h (530 ft3/min) and 1,5 m3/s 5 400 m3/h (3 178 ft3/min). This Technical Specification is applicable to air filters having an initial efficiency of less than 99 % with respect to 0,4 m particles. Filters in the higher end and

32、 those with an above 99 % initial efficiency are tested and classified according to other standards. It combines two test methods: a “fine” method for air filters in the higher efficiency range and a “coarse” method for filters of lower efficiency. In either case, a flat-sheet media sample or media

33、pack sample from an identical filter is conditioned (discharged) to provide information about the intensity of the electrostatic removal mechanism. After determination of its initial efficiency, the untreated filter is loaded with synthetic dust in a single step until its final test pressure drop is

34、 reached. Information on the loaded performance of the filter is then obtained. The performance results thus obtained cannot alone be quantitatively applied to predict in-service performance with regard to efficiency and lifetime, so other factors influencing performance are presented in Annexes A a

35、nd B. 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 amendments) applies. ISO 2854, Statistica

36、l interpretation of data Techniques of estimation and tests relating to means and variances ISO 5167-1:2003, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements ISO 12103-1:1997, Road

37、 vehicles Test dust for filter evaluation Part 1: Arizona test dust ISO 21501-1, Determination of particle size distribution Single particle light interaction methods Part 1: Light scattering aerosol spectrometer ISO 21501-4, Determination of particle size distribution Single particle light interact

38、ion methods Part 4: Light scattering airborne particle counter for clean spaces JIS Z 8901:1995, Test powders and test particles1)1) Japanese Industrial Standard. ISO/TS 21220:2009(E) 2 ISO 2009 All rights reserved3 Terms, definitions, symbols and abbreviated terms For the purposes of this document,

39、 the following terms, definitions, symbols and abbreviated terms apply. 3.1 arrestance A weighted (mass) removal of loading dust by a filter NOTE It is expressed as the percentage of the dust captured by the filter in terms of the mass of the total dust fed into it. 3.2 average arrestance Amratio of

40、 the total amount of loading dust retained by the filter to the total amount of dust fed up to the final test pressure drop 3.3 charged filter filter in which the filter media is electrostatically charged or polarized 3.4 conditioned efficiency efficiency of the conditioned filter media operating at

41、 an average media velocity corresponding to the test air flow rate in the filter 3.5 counting rate number of counting events per unit of time 3.6 correlation ratio ratio of downstream to upstream particle counts without the test filter in the test duct 3.7 DEHS DiEthylHexylSebacate liquid used for g

42、enerating the DEHS test aerosol 3.8 dust loaded efficiency efficiency of the filter operating at test flow rate and after dust loadings up to the final test pressure drops 3.9 effective filtering area area of filter medium in the filter which collects dust 3.10 filter face area frontal face area of

43、the filter including the header frame NOTE Nominal values: 0,61 m 0,61 m (24 in 24 in). 3.11 filter face velocity air flow rate divided by the filter face area ISO/TS 21220:2009(E) ISO 2009 All rights reserved 33.12 final filter air filter used to collect the loading dust passing through or shedding

44、 from the filter under test 3.13 final test pressure drop pressure drop of the filter up to which the filtration performance is measured 3.14 initial efficiency efficiency of the clean untreated filter operating at the test air flow rate 3.15 initial pressure drop pressure drop of the clean filter o

45、perating at the test air flow rate 3.16 isokinetic sampling sampling of the air within a duct such that the probe inlet air velocity is the same as the velocity in the duct at the sampling point 3.17 KCl solid potassium chloride (KCl) particles generated from an aqueous solution and used as a test a

46、erosol 3.18 loading dust synthetic test dust test dust specifically formulated for loading of the filter NOTE Two types of loading dusts are used: ISO 12103-A fine test dust is used for the loading of filters according to the fine dust method and ASHRAE dust is used for the filters tested according

47、to the coarse method. 3.19 mean diameter geometric mean of the upper and lower border diameters in a size range 3.20 media velocity air flow rate divided by the effective filtering area NOTE It is expressed to an accuracy of three significant figures. 3.21 minimum efficiency lowest efficiency of ini

48、tial, conditioned or dust loaded efficiencies 3.22 neutralization process by which the aerosol is brought to a Boltzmannn charge equilibrium distribution with bipolar ions 3.23 particle bounce behaviour of particles that impinge on the filter without being retained 3.24 particle size equivalent opti

49、cal diameter of a particle ISO/TS 21220:2009(E) 4 ISO 2009 All rights reserved3.25 particle number concentration number of particles per unit volume of the test air 3.26 penetration ratio of the particle concentration downstream to upstream of the filter 3.27 recommended final pressure drop maximum operating pressure drop of the filter as recommended by the manufacturer at rated air flow 3.28 re-entrainment release to the air flow of particles previously collected on the filter 3.29 shedding release to th