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1、BRITISH STANDARD BS EN 12667:2001 Thermal performance of building materials and products Determination of thermal resistance by means of guarded hot plate and heat flow meter methods Products of high and medium thermal resistance The European Standard EN 12667:2001 has the status of a British Standa
2、rd ICS 91.100.01; 91.120.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 12667:2001 This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect
3、on 15 March 2001 BSI 03-2001 ISBN 0 580 36512 3 National foreword This British Standard is the official English language version of EN 12667:2001. This British Standard together with BS EN 12664 and BS EN 12939 supersedes BS 874-2.1:1986 and BS 874-2.2:1988. The UK participation in its preparation w
4、as entrusted by Technical Committee RHE/9, Thermal insulating materials, to Subcommittee RHE/9/2, Thermal properties of insulating materials, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The Br
5、itish Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A Brit
6、ish Standard does not purport to include 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 legal obligations. aid enquirers to understand the text; present t
7、o the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover,
8、 the EN title page, pages 2 to 55 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12667 January 2001 ICS 91.100.01; 91.120.1
9、0 English version Thermal performance of building materials and products - Determination of thermal resistance by means of guarded hot plate and heat flow meter methods Products of high and medium thermal resistance Performance thermique des matriaux et produits pour le btiment Dtermination de la rs
10、istance thermique par la mthode de la plaque chaude garde et la mthode fluxmtrique Produits de haute et moyenne rsistance thermique Wrmetechnisches Verhalten von Baustoffen und Bauprodukten Bestimmung des Wrmedurchlasswiderstandes nach dem Verfahren mit dem Plattengert und dem Wrmestrommessplatten-G
11、ert Produkte mit hohem und mittlerem Wrmedurchlasswiderstand This European Standard was approved by CEN on 25 June 2000. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard withou
12、t any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made
13、by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ire
14、land, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any
15、 form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12667:2001 E Page 2 EN 12667:2001 Contents Page Foreword.3 Introduction4 1Scope5 2Normative references.5 3Definitions, symbols and units 6 4Principle7 5Apparatus8 6Test specimens13 7Testing procedure.15 8Calculations 17
16、9Test report.20 Annex A (normative) Limitations to the implementation of the measurement principle and on measurable properties.22 Annex B (normative) Limits for equipment performance and test conditions Guarded hot plate.32 Annex C (normative) Limits for equipment performance and test conditions He
17、at flow meter 38 Annex D (normative) Equipment design44 Page 3 EN 12667:2001 BSI 03-2001 Foreword This European Standard has been prepared by Technical Committee CEN/TC 89, Thermal performance of buildings and building components, the Secretariat of which is held by SIS. This European Standard shall
18、 be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2001, and conflicting national standards shall be withdrawn at the latest by December 2001. This document is one of a series of standards on thermal test methods that supp
19、ort product standards for building materials. The annexes A, B, C and D are normative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
20、 France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Page 4 EN 12667:2001 BSI 03-2001 Introduction Steady state heat transfer properties may be measured by a number of standardized test methods: the choice of
21、 the most appropriate method depends on specimen characteristics. This standard covers the guarded hot plate and the heat flow meter methods only. For routine testing, the operator of these two methods needs only this standard and the relevant product standard, which may impose additional requiremen
22、ts related to specimen preparation or testing conditions. Detailed requirements for measurements in any testing condition of thermal resistance of any compatible plane specimen are given: for the guarded hot plate method, in ISO 8302:1991 and EN 1946-2:1999; for the heat flow meter method, in ISO 83
23、01:1991 and EN 1946-3:1999. This standard provides general information on the apparatus, all mandatory limits for the equipment design and operation, and the specification of testing procedure, for specimens, with high and medium thermal resistance, described in relevant technical specifications (e.
24、g. a European product standard or a European technical approval). The information given is technically equivalent to that in ISO 8301:1991 and ISO 8302:1991, for both these methods. It is only intended for the routine testing of specimens (within the limitations of thickness and inhomogeneity, etc.
25、given in annex A) using equipment which has been constructed according to 5.1 and which has already been validated according to EN 1946-3:1999 or EN 1946-2:1999. It also includes examples of equipment designs that meet the requirements of 5.1, so that the assessment of the accuracy of equipment desi
26、gned accordingly does not need an error analysis but only the equipment performance check. Measurements on products of medium and low thermal resistance and on moist products of any thermal resistance are covered in EN 12664. Measurements on thick products of high and medium thermal resistance are c
27、overed in EN 12939. Page 5 EN 12667:2001 BSI 03-2001 1Scope This standard specifies principles and testing procedures for determining, by means of the guarded hot plate or heat flow meter methods, the thermal resistance of test specimens having a thermal resistance of not less than 0,5 m2K/W NOTE 1
28、The above limit is due to the effect of contact thermal resistances. An upper limit for measurable thermal resistance depends upon a number of factors described in this standard, but a unique figure cannot be assigned. It applies in principle to any mean test temperature, but the equipment design in
29、 annex D is essentially intended to operate between a minimum cooling unit temperature of -100 C and maximum heating unit temperature of +100 C. NOTE 2 Limits to the mean test temperature are only imposed by the materials used in the apparatus construction and by ancillary equipment. It supplies add
30、itional limits for equipment performance and test conditions. It does not supply general equipment design procedures, equipment error analysis, equipment performance check or the assessment of equipment accuracy. It supplies example designs of equipment complying with the requirements set down in th
31、is standard. This standard does not supply general guidance and background information (e.g. the heat transfer property to be reported, product-dependent specimen preparations, procedures requiring multiple measurements, such as those to assess the effect of specimen non-homogeneities, those to test
32、 specimens whose thickness exceeds the apparatus capabilities, and those to assess the relevance of the thickness effect). Due to these limitations, this standard should be used in conjunction with the product standard relevant to the product to be tested. Although intended primarily for building ma
33、terials, it can also be used for specimens of any material that conforms to the requirements specified. This standard does not cover measurements on moist products of any thermal resistance or measurements on thick products of high and medium thermal resistance. 2Normative references This standard i
34、ncorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this
35、standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred applies (including amendments). NOTE References to ISO 8301:1991 and ISO 8302:1991 do not cover the complete test methods, but are limited to such items as equipment
36、design and performance check, not covered by European Standards or parts of them; references to ISO 8301:1991 or ISO 8302:1991 are not needed for routine testing according to this standard. EN 1946-2:1999Thermal performance of building products and components Specific criteria for the assessment of
37、laboratories measuring heat transfer properties Part 2: Measurements by guarded hot plate method EN 1946-3:1999Thermal performance of building products and components Specific criteria for the assessment of laboratories measuring heat transfer properties Part 3: Measurements by heat flow meter metho
38、d Page 6 EN 12667:2001 BSI 03-2001 EN 12664Thermal performance of building materials and products Determination of thermal resistance by means of guarded hot plate and heat flow meter methods Dry and moist products of medium and low thermal resistance EN 12939Thermal performance of building material
39、s and products Determination of thermal resistance by means of guarded hot plate and heat flow meter methods Thick products of high and medium thermal resistance EN ISO 7345Thermal insulation Physical quantities and definitions (ISO 7345:1987) ISO 8301:1991Thermal insulation Determination of steady-
40、state thermal resistance and related properties Heat flow meter apparatus ISO 8302:1991Thermal insulation Determination of steady-state thermal resistance and related properties Guarded hot plate apparatus 3Definitions, symbols and units 3.1Terms and definitions For the purposes of this standard, th
41、e terms and definitions in EN ISO 7345 apply. Most relevant definitions for the measurement of heat transfer properties on high and medium thermal resistance products are to be found in A.2. 3.2Symbols and units SymbolQuantityUnit Ametering area measured on a selected isothermal surfacem2 Adarea of
42、the defectm2 Amarea of the metering sectionm2 Rthermal resistancem2K/W Ttransfer factorW/(mK) T1temperature of the warm surface of the specimenK T2temperature of the cold surface of the specimenK Tmmean test temperature (usually (T1 + T2)/2)K Vvolumem3 cspecific heat capacity J/(kgK) dthickness; ave
43、rage thickness of a specimenm eedge number ratio- ehheat flow meter output voltagemV fcalibration factor of the heat flow meterW/(mVm2) Page 7 EN 12667:2001 BSI 03-2001 Symbol Quantity Unit mmass (of the specimen)kg qdensity of heat flow rateW/m2 rthermal resistivityKm/W ?Rincrements of thermal resi
44、stancem2K/W ?Ttemperature difference (usually T1 - T2)K ?dincrements of thicknessm ?mrelative mass change- ?ttime intervals ?heat flow rateW ?thermal conductivityW/(mK) ?tthermal transmissivityW/(mK) ?porosity- ?Plocal porosity - ?densitykg/m3 NOTE The meaning of some additional subscripts is specif
45、ied in the text. 4Principle 4.1Apparatus Both the guarded hot plate apparatus and the heat flow meter apparatus are intended to establish within homogeneous specimens with flat parallel faces, in the form of slabs, a unidirectional constant and uniform density of heat flow rate. The part of the appa
46、ratus where this takes place with acceptable accuracy is around its centre; the apparatus is therefore divided into a central metering section in which measurements are taken, and a surrounding guard section. 4.2Measuring the density of heat flow rate With the establishment of steady state in the me
47、tering section, the density of heat flow rate, q, is determined from measurement of the heat flow rate, ?, and the metering area, A, that the heat flow rate crosses. 4.3Measuring the temperature difference The temperature difference across the specimens, ?T, is measured by temperature sensors fixed
48、at the surfaces of the apparatus in contact with the specimen and/or those of the specimens themselves, where appropriate. Page 8 EN 12667:2001 BSI 03-2001 4.4Deriving the thermal resistance or transfer factor The thermal resistance, R, is calculated from a knowledge of q, A and ?T if the appropriat
49、e conditions given in A.3.2 are realized. From the additional knowledge of the thickness, d, of the specimen, the transfer factor, T, is computed. 4.5Computing thermal conductivity or thermal transmissivity The mean thermal conductivity, ? or thermal transmissivity, ?t, of the specimen may also be computed if the appropriate conditions to identify them and those given in A.4.3 are realized. 4.6Apparatus limits The application of the method is limited by the capability of the apparatus to mainta
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