1、BRITISH STANDARD _ Thermal insulating products for building applications - Conditioning to moisture equilibrium under specified temperature and humidity conditions The European Standard EN 12429:1998 has the status of a Briish Standard ICs 91.100.99 BS EN 12429:1998 BS EN 124291998 This British Stan
2、dard, having been prepared under the diredion of the Sector Board for Building and Cid Engineering, was published under the authority of the Standards Board and comes into effect on 15 November 1998 O BSI 1998 ISBN O 680 30296 2 National foreword This British Standard is the English language version
3、 of EN 124291998. It is one of a large number of European test method standards which have been introduced for thennal insulating products. Guidance on the content and application of these new test methods is given in PD 6621. The UK participation in its prepdon was entrusted by Technical Committee
4、B/540, Energy peronnance of materials, components and buildings, to Subcommittee i3/540/1, European Standards for thermal insulation, which has the responsibility to: - aid enquirers to undemtmd the text, - present to the responsible European committee any enquiries on the - monitor related internat
5、ional and European developments and promulgate interpretation, or proposais for change, and keep the UK interests informed; them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British standards which implement int
6、edona.l or European publications referred to in this document may be found in the BSI standasds Catalogue under the section entitied “intemaiionai Standards Correspondence Index“, or by using the Find“ faciiity of the BSI Standards Electronic Catalogue. A British standard does not purport to include
7、 all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legai obligations. Summary of pages This document comprises a front cover, an inside hnt cover, the EN tit
8、le page, pages 2 to 9 and a back cover. Amendments issued since publication Amd No. EUROPEAN mmm NORME EUROPENNE EUROPB NORM EN 12429 June 1998 ICs 91.120.10 Descriptors: Thermal insulation, buiidings, thermal insulating materials, tests, hygroscopic tests, detemination of content, hddiQ, specimen p
9、repdon English version TheEC Internal Regulaions which stipulate the conditions for giving this European Standard the status of a national standard without amy alteration. Uptodate lists and bibliographid references concerning such national standards may be obtained on application to the Central Sec
10、retariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by tsanslation under the responsibility of a CEN member into its own language and notified to the Central Secretanat has the same status as the offi
11、cial versions. CEN members are the national standards bodies of Aus- Belgium, Czech Republic, Demark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for StandarMion Comit Euro
12、pen de Normalisation Europisches Komitee fr Normung Centrai Secretariat: rue de Stassart 36, B-1060 Brussels O 1998 CEN AU rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 124291998 E Page 2 EN E4291998 and proberti annex B - Computer calcu
13、lations to determine the limiting value of moisture content change; annex C - Caiculations of conditioning time to reach equilibrium using the Fourier number. and two informative annexes: This European standard has been drafted for applications in buings but it may also be used in other areas where
14、it is relevant This European Standard shall be given the status of a nationai standard, either by publication of an identical text or by endorsement, at the latest by Foreword Contents This European Standard has been prepared by page Echnical Committee CEN/TC 88, Thermai insulating materials and pro
15、ducts, the Secretariat of which is held by DIN. 1 Scope 3 This European Standard is one of a series of standards 2 Normative references 3 Which SpeCifv methOdS for determining dimensions 3 finiti and abreons 3 2 Foreword 4 Principle 6 Testspecimens 7 Procedure 8 9 Accuracy 10 Testreport 5 is the moi
16、sture content at upper iimit of hygroscopic range; is the moisture content in equiiibrium with atmosphere 23/50. Figure 1 - Moisture content versus time during step 1 and step 2 O BSI 1998 * * VI Page 5 EN 124291998 At preselected intervais of time, depending on the product tested and the atmosphere
17、 used, remove and weigh the test specimens to determine any mass changes. Continue until the change in moisture content is less than the iimiting value, i.e. where: AW 60 17 4- 31 7 2 2 18 4 1- Page 7 EN 1824291998 The time (in days) needed to reach the hygroscopic range from an initial moisture con
18、tent of io kghn3 (ICE 50 k-3) is given in Table B.l. If the initiai amount of moisture is below 10 kg/m3, the time needed can be estimated by proportion nom the figures given in Wle B. 1. Tabe B.2 - Limiting value of moisture content change, Awl Material Moisture content change in kg/m3 at quoted te
19、mperature Fibrous and I 11,4 1; 1: i granular materials Cellular plastics Cork 1,2 25 50 NOTE The values in Table B.2 are calculated under the assumption that the products are homogeneous and that there are no moulded skins, facings or other surface treatment. O BSI 1998 Page 8 EN l2429A998 Annex C
20、(informative) calculations of conditioning time to reach equilibrium using the Fourier number The rekitionship between moisture content and time is described in the below (WO and We are respectively, the initiai and equilibrium moisture contents). The initiai moisture content is assumed uniformiy db
21、tributed. Assuming, for example, that 90 % of the equahation has taken place, that is the moisture content will be in the range I10 % from equilibrium with ahnosphere 23/50, thex - we = 0,lO WO - We and from the figure (2.1, Fo = O,%. It is now possible to estimate the quahation time from the defini
22、tion of the Fourier number where Dw is the moisture diffusMQ, in square metres per t d second; is the equalization time, in seconds; is the test specimen thickness for two-sided drying, in metres. The moisture cWfuski W is the saturation humidity by volume, in kilograms per cubic metre (at 23 OC, ws
23、at = 0,021 kg/m3); is the moisture differential capacis: in kilograms per cubic metre. (C.2) Fo X is the relative humidity, in percentage. spicai material properties for some products are given in Wle C.l below. Table C.l- Material properties Material The assumption of 90 % equalization mm rougly t!
24、mt the moisture content wiii be in the range f10 % from equiiibrium with ahnosphere 23/50. The theory requires the initial moisture content to be uniformly distributed This is not quite true in the procedure suggested here, but the non-uniform moisture distribution at the beginning of step 2 in Figu
25、re 1 of this standasd normally has no essential effect on the results. Wle C.2 shows a rough summary of the results. This table can be used in the absence of experimental resuits developed according to annex A Table C.2 - Required conditioning period expressed as y X d2 where y is the conditioning t
26、ime factor and d is the thickness of the product in centimetres Material category Combining the equations (C.2) and (C.3) the equalization time can now be calculated as: (C.5) Fo X d2 4 X D, - 4 X Sv X 0,021= 0,84 X d2 X If t is expressed in hours and d in centjmetres: 10 X d2 X S, t= - NOTE The sam
27、e results would have been obtained with calculations using the vapour pressure (PJ as a driving force for the diffusion and/or moisture content mass by mass (u). O BSI 1998 BS EN 12429: 1998 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national
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