1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 16012:2012Thermal insulation forbuildings Reflectiveinsulation products Determination of the declaredthermal performanceCopyright European Committee for Standardization Pro
2、vided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16012:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16012:2012.The UK participation in its preparation was entrusted to TechnicalCo
3、mmittee B/540/9, Reflective insulation and in-situ testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The Br
4、itish Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 68364 0ICS 91.100.60Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 29 Febru
5、ary 2012.Amendments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16012:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN
6、 16012 February 2012 ICS 91.100.60 English Version Thermal insulation for buildings - Reflective insulation products -Determination of the declared thermal performance Isolation thermique des btiments - Produits disolation rflchissants - Dtermination de la performance thermique dclare Wrmedmmstoffe
7、fr Gebude - Reflektierende Wrmedmm-Produkte - Bestimmung der Nennwerte der wrmetechnischen Eigenschaften This European Standard was approved by CEN on 23 December 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European S
8、tandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (Eng
9、lish, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium,
10、 Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN
11、COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16012:2012: ECopyright European C
12、ommittee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16012:2012EN 16012:2012 (E) 2 Contents Page Foreword 4Introduction .51 Scope 62 Normative references 63 Terms, definitions, symbols and units 73
13、.1 Terms and definitions .73.2 Symbols and units .74 Description of product types 84.1 Product classification .84.2 Product Type 1 .84.3 Product Type 2 .94.4 Product Type 3 .94.5 Product Type 4 105 Methods of assessment . 105.1 General . 105.2 Thickness measurement 105.3 Conditioning and specimen pr
14、eparation 115.4 Determination of thermal resistance outline 115.5 Determination of core thermal resistance of Product Type 1 115.6 Determination of core thermal resistance of Product Type 2 125.7 Determination of core thermal resistance of Product Type 3 (METHOD C) . 135.8 Determination of the therm
15、al performance of Product Type 4 175.9 Emissivity 176 Uncertainty 186.1 General . 186.2 Thickness measurements 186.3 Use of surface thermocouples on thin samples in a guarded hot plate or in heat flow meter measurement 196.4 Use of dummy insulation specimens . 196.5 Derivation of the core resistance
16、 of a Type 3 Product from hot box measurements 197 Expression of results . 197.1 Results derived from hot plate and emissivity measurements (Products Type 1 high emissive standard: black light trap surface. Copyright European Committee for Standardization Provided by IHS under license with CENNot fo
17、r ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16012:2012EN 16012:2012 (E) 26 Calibration standards shall be certified by the manufacturer of the apparatus or by an independent institute, accompanied by a certificate showing the measured emissivity. The calibratio
18、n standards shall be recertified (or replaced by new certified standards) at least every two years. D.4 Calculation of the emissivity The emissivity is determined from comparing the measured result for the specimen with the two calibration standards. With the sensor signals (U, UHand UL) and the kno
19、wn emissivity of calibration standards ( Land H), the emissivity, , of the specimen shall be calculated by: = H- (H- L) (UH- U) / (UH- UL) (D.1) NOTE The measurement range of the apparatus is limited to values between those of the two calibration standards used, hence within the emissivity range of
20、0,020,94. However, there are practical limits to the measurement of very low values of emissivity, irrespective of the method used. Errors increase significantly below emissivity 0,05. D.5 Sampling and preparation of the test specimens D.5.1 Sampling A sample of an undamaged reflective insulation pr
21、oduct shall be selected at random from a batch of production material or from product placed on the market. D.5.2 Dimensions and numbers of specimens A minimum of three specimens should be taken from the sample to be representative of the length and width of the product. If the faces of the product
22、differ then a minimum of three specimens shall be taken from each face. The specimen size should be adapted to the size of the specimen holder and to the fixing system of the specimen holder (see D.6), but shall be at least 250 mm by 250 mm. D.5.3 Conditioning of specimens for ageing The specimens s
23、hall be exposed in a climatic chamber to 90 % relative humidity and 70 C temperature for a period of 28 days. The edges of the specimens shall be adequately protected by securing self-adhesive aluminium foil tape around each edge of the specimen from the upper surface to the lower surface, to preven
24、t ingress of moisture through the cut edge. After the conditioning process, the specimens shall then be allowed to stabilize for a minimum of two hours at a temperature of (23 2) C and relative humidity of (50 20) %. D.6 Procedure for measurement of specimens The apparatus shall be switched on at le
25、ast 2 hours before calibration and before commencing measurements. The apparatus shall be installed in a fixed position and shall not be moved during measurement. Special precautions should be taken to ensure that the calibration standards, the specimens and the apparatus are brought to equilibrium
26、in the same standard climatic conditions. Air currents and draughts in the measuring area shall be avoided. The specimen shall be brought up to the apparatus in a vertical orientation, pressed against the spacers around the measuring window of the apparatus and the apparatus shall be activated to be
27、gin measurement. The emissivity shall be measured in five positions on each specimen. In order to avoid changes in the specimen temperature during the measurement, the time that the specimen is left in the measuring position shall be reduced to a minimum. Between specimen positioning and start of me
28、asurement, no more than 1 second shall pass. If this speed of measurement is not achieved, or if the measurement is otherwise interrupted, or if the measurement on a specimen is to be repeated, the specimen should be withdrawn from Copyright European Committee for Standardization Provided by IHS und
29、er license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16012:2012EN 16012:2012 (E) 27 the apparatus for the time it needs to cool down to laboratory temperature. Rapid movement of the specimen over the apparatus while measuring is possible, but co
30、upling of the specimen to a massive aluminium block by heat conductance paste gives the most consistent results. The higher the emissivity and/or the lower the specific heat capacity of the material, the longer the specimen will need to cool down to laboratory temperature. In order to reduce measure
31、ment variability to a minimum (laboratory, specimen and apparatus related), the apparatus shall be recalibrated using the two calibration standards at least once per hour of use. NOTE In order to measure values with highest possible repeatability, the following should be observed: a) all correspondi
32、ng tests should be carried out by the same person; b) re-calibrate the apparatus for each specimen; c) use heat conductance paste and a massive aluminium heat-sink; d) measure only reflective sheets, not the additional wadding or other materials in between the foil and the heat-sink; e) ensure the m
33、easuring time is less than 1,5 seconds; f) allow enough time for apparatus to heat up before starting the test (approximately 2 hours). D.7 Expression of results The emissivity of the specimen shall be expressed to 2 decimal places. All single measurements resulting in an emissivity 0,94 (measuremen
34、t range of the apparatus) should be set to 0,02 or 0,94 respectively. The emissivity mean value, all the single values per specimen and the standard deviation of the results from the tested product shall be included on the test report. The emissivity mean-value shall be rounded to two decimal places
35、. For three specimens per foil and five measurement spots per specimen, the mean value of these 15 measurement readings is i. For the declared emissivity value, Dthe statistical approach in EN ISO 10456 shall be used for production variation and uncertainty of measurement. A mean value below 0,05 is
36、 declared as 0,05. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 16012:2012EN 16012:2012 (E) 28 Annex E (normative) “Dummy specimen” technique for the heat flow meter app
37、aratus E.1 Principle Heat flow meter apparatus needs to be calibrated with reference materials having similar thermal performance to the materials being tested. As most heat flow meter apparatus will not have been calibrated with thin reference materials ( 20 mm thick), a method is given in this ann
38、ex to ensure that thermal resistance measurements made on such thin materials, in a heat flow meter apparatus, conform to ISO 8301. This method is referred to as the “dummy specimens” method. E.2 Procedure In this method, a pair of “dummy specimens” each not less than 10 mm thick shall be used to ma
39、ke a composite specimen of a thickness that is covered by the reference samples used to calibrate the heat flow meter apparatus. Two measurements shall be made using the specimen arrangements illustrated in Figures E.1 and E.2: 1) using only the two dummy specimens, to determine their combined therm
40、al resistance; 2) with the specimen under test sandwiched between the two dummy specimens. 3) The thickness of the test specimen shall be maintained by the use of suitable low conductivity spacers set to the measured thickness of the test specimen and placed between the dummy specimens outside the m
41、etering area. The thermal resistance of the material under test shall then be derived from the results of these two measurements as the difference in thermal resistance between the second test and the first test. Key 1 cold plate 2 dummy specimen 1 3 dummy specimen 2 4 hot Plate 5 Heat Flux Transducer Figure E.1 Schematic diagram of dummy specimen arrangement Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
