EN 1946-4-2000 en Thermal Performance of Building Products and Components - Specific Criteria for the Assessment of Laboratories Measuring Heat Transfer Properties - Part 4 Measure.pdf

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1、 STD=BSI BS EN L74b-4-ENGL 2000 m Lb24bb9 0862412 952 m BS EN 1946-4:2000 BRITISH STANDARD Thermal performance of building products and components - Specific criteria for the assessment of laboratories measuring heat transfer properties - Part 4: Measurements by hot box methods The European Standard

2、 EN 194-4.2000 has the status of a British Standard ICs 91.100.01; 91.120.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PEEMiTED BY COPYRIGFIT LAW STD*BSI BS EN 1946-4-ENGL 2000 Lb24bb9 OBb2.413 899 W BS EN 1946-4:ZOOO been prepared under the direction of the Engineering Amd.No. Sector Committee, w

3、as published under the authority of the Standards Committee and comes into effect on 15 July 2000 O BSI 07-2000 National foreword Date Comments This British Standard is the official English language version of EN 194642000. The UK participation in its preparation was entrusted by Technical Committee

4、 RHEB, Thermal insulating materials, to Subcommittee RHE/s/s, Thermal properties of insdating materials, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developm

5、ents and promulgate interpretation, or proposals 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 international or European publi

6、cations 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 British Standard does not purport to include ail the necessary prov

7、isions of a conhct. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside hnt cover, the EN title page, pages 2 to 45 an

8、d a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. ISBN O 580 34792 3 STD-BSI BS EN 3946-4-ENGL 2000 1624669 OBb2434 725 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1946-4 April 2000 ICs 91.100.01; 91.120.10 English version Therm

9、al performance of building products and components - Specific criteria for the assessment of laboratories measuring heat transfer properties - Part 4: Measurements by hot box methods Performance thermique des produits et composants pour le btiment - Critres particuliers pour lvaluation des laboratoi

10、res mesurant les proprits de transmission thermique - Partie 4: Mesurages selon les mthodes de boite chaude Wrmetechnisches Verhalten von Bauprodukten und Bauteilen - Technische Kriterien zur Begutachtung von Laboratorien bei der Durchfhrung der Messungen von Wrmebertragungseigenschaften -Teil 4: Me

11、ssungen nach dem Heizkasten-Verfahren This European Standard was approved by CEN on 4 March 2000. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this Europan Standard the status of a national standard without any alteration. Up-to-

12、date lists and bibliographical references concerning sich national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by traislation under t

13、he responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as tie official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembo

14、urg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMIITEE FOR STANDARDIZATION EUROPISCHES KOMITEE FUR NORMUNG COMIT EUROPEN DE NORMALISATION Central Secretariat: rue de Stassart, 36 B-1050 Brussels 8 2000 CEN All rights of exploitation in any form and by a

15、ny means reserved worldwide for CEN national Members. Ref. No. EN 19464:2000 E 0 BSI 07-2000 STD.BS1 BS EN 1746-4-ENGL 2000 Lb24669 0862435 bb3 Page 2 EN 1946-42000 Contents Page Foreword . 3 1 Scope . 4 2 Normative references 4 3 Definitions. symbols and units 4 4 5 Equipment manual 6 Calibration a

16、nd maintenance files . 25 6 Measurement procedure document . 25 7 Assessment . 26 Annex A (normative) Limits for equipment performance and test conditions 27 Annex B (informative) Calculation of some hot box errors . 34 Bibliography 45 O BSI 07-2000 Page 3 EN 1946-4:2000 Foreword This European Stand

17、ard 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 be given the status of a national standard, either by publication of an identical text or by endorsement, at the l

18、atest by October 2000, and conflicting national standards shall be withdrawn at the latest by October 2000. According to the CENCENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republi

19、c, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. No existing European Standard is superseded. This European Standard is divided into parts. The first part covers common criteria applic

20、able to all heat transfer property measurements; each subsequent part covers the specific technical criteria applicable to each heat transfer property measurement method described in appropriate standards. The following parts have been developed: Part 1 : Common criteria Part 2: Part 3: Part 4: Part

21、 5: Measurements by the guarded hot plate method Measurements by the heat flow meter method Measurements by hot box methods Measurements by the pipe test methods Basic information on heat transfer in hot box apparatus and related temperature non-uniformities may be found in the CEN Technical Report

22、I Heat transfer and errors in hot box apparatus“, see 2 in the Bibliography. Annex A of this European Standard is normative, annex B is informative. Q BSI 07-2000 STDmBSI BS EN L94b-Y-ENGL 2000 I Lb24669 06624L7 434 W Page 4 EN 1946-412000 1 Scope This part 4 of this standard provides specific techn

23、ical criteria for the assessment of laboratories to undertake steady-state heat transfer property measurements on products and components using calibrated or guarded hot box apparatus in accordance with EN IS0 8990: 1996, including its application to doors and windows in accordance with EN IS0 12567

24、, or using a heat flow meter in a hot box apparatus in accordance with EN 1934: 1998. It complements the common criteria in part 1. Guidance is given on the organization and contents of the equipment manual, the calibration and maintenance files and the measurement procedure document. It provides in

25、formation on mandatory equipment performance specifications and equipment description. It supplements error analysis and calculations for the equipment design not supplied in EN IS0 8990:1996, EN 1934:1998 and related standards. It provides information on experimental procedures suitable for the ass

26、essment of instrument accuracy. 2 Normative references This standard incorporates 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

27、amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 1934:1998 EN 1946- 1 : 1999 Thermal performance of buildings - Determination of t

28、hermal resistance by hot box method using heat flow meter - Masonry Thermal performance of building products and components - Specific criteria for the assessment of laboratories measuring heat transfer properties - Part 1 : Common criteria Building components and building elements - Thermal resista

29、nce and thermal transmittance - Calculation method (IS0 6946: 1996) Thermal insulation - Physical quantities and definitions (IS0 7345: 1987) Thermal insulation - Determination of steady-state thermal transmission properties - Calibrated and guarded hot box (IS0 8990: 1994) Thermal performance of wi

30、ndows and doors - Determination of thermal transmittance by hot box method (IS0 12567:-) EN IS0 6946 EN IS0 7345 EN IS0 8990: 1996 EN IS0 12567:- I) 3 Definitions, symbols and units 3.1 Definitions For the purposes of this standard, the following terms and definitions and the definitions given in pa

31、rt 1 of this standard, in EN IS0 7345, in EN 1934: 1998, in EN IS0 12567 and those of EN IS0 8990: 1996 not given in this standard, apply. To be published O BSI 07-2000 Page 5 EN 1946-412000 3.1.1 specimen surface-to-surface thermal resistance Physical quantity defined by: 3.1.2 thermal transmittanc

32、e of a specimen Physical quantity defined by: l U= 4Tni -Trie) or defined (when R, can be defined) as; 1 U= Rsi +Ri + - maximum hot side temperature; - minimum and maximum specimen thickness to be tested in the apparatus; minimum and maximum specimen thermal resistance; minimum and maximum surface c

33、oefficients required during tests; minimum and maximum temperature difference across the specimen; dimensions of expected inhomogeneities in the specimens; overall equipment accuracy and maximum acceptable error on measured property in a defined worst-case condition; requirements on the control of r

34、elative humidity on the hot and cold side; maximum mass for a specimen to be accommodated in a frame. - - 4.3 Equipment description The following information shall be documented and made available for examination during the assessment: - - principle of operation (see 1.5 of EN IS0 8990: 1996 or 4.1

35、of EN 1934: 1998); type of apparatus: guarded hot box, see 1.5.2 of EN IS0 8990:1996, or calibrated hot box, see 1.5.3 of EN IS0 8990:1996; principal dimensions of apparatus, in particular height and width of the metering box or of the metering area of the heat flow meter in a hot box with a heat fl

36、ow meter, height and width of the guard box for guarded hot boxes; simple diagrams illustrating the design of the equipment with special attention to the heat supply and air circulation (see 2.3.2 of EN IS0 8990:1996 or 6.2.3 of EN 1934:1998), the guard box (see 2.4 of EN IS0 8990:1996), the specime

37、n frame and edge insulation (see in particular 2.5 of EN IS0 8990: 1996) and the cold side chamber (see in particular 2.6 of EN IS0 8990: 1996); position, connections and numbering of temperature sensors (see 2.7 of EN IS0 8990:1996 or 6.3 ofEN 1934:1998); - - - O BSI 07-2000 STD.BSI BS EN 174b-4-EN

38、GL 2000 = 1b24bb 08b242L 7b5 9 Page 8 EN 1946-4:2000 - electrical components/instruments and main ancillary equipment (see 2.7.5 and 2.8 of EN IS0 8990:1996 or 6.3.4 and 6.4 of EN 1934: 1998); details of data acquisition system and related computer programs for data analysis. - To avoid duplication,

39、 reference may be made to manuals supplied by the instrument manufacturers or to relevant clauses of EN IS0 8990: 1996 or EN 1934: 1998. 4.4 Equipment design and error analysis 4.4.1 General With reference to the performance specification given in 4.2, details shall be given in the equipment manual

40、on the design guidelines followed, and the related error analysis. A list of the errors to be considered in the error analysis precedes the description of the equipment design documentation in this clause. More specific information on some errors is given in the references of the Bibliography. The i

41、nformation given in this subclause 4.4 also supplements that given in EN IS0 8990: 1996 or EN 1934: 1998. NOTE In most cases there are no general rules or simple expressions to evaluate errors. An accurate error analysis usually requires numerical calculations based on the specific equipment conside

42、red, nevertheless the knowledge of their existence can stimulate a detailed analysis for each piece of equipment. Elementary conservative error calculations for some typical cases are given in annex B. For equipment having characteristics exactly as indicated in this subclause or design details as i

43、ndicated in annex B, no fixther calculations are needed, unless more precise calculations are wanted. In other circumstances similar calculations can be performed by analogy. 4.4.2 Sources of errors 4.4.2.1 General Measured heat transfer properties in hot box apparatus are either the specimen surfac

44、e-to-surface thermal resistance, R, or the thermal transmittance, U. Surface thermal resistances R, on either side of the specimen (RSi or Rse) play a relevant role in the error analysis: the heat flow rate, 0, exchanged by a surface of areaA is: T, is unknown from measurements of T, and Ta unless h

45、, and h, are known or T, is equal to Ta. Any non-uniformity in surface coefficients E h, and h, andor in air temperature Ta, and in the temperatures of the surfaces seen from the surface considered, is a source of uncertainty in T,. NOTE 1 Information on the calculation of local coefficients of heat

46、 transferE h, and h, may be found in 2, see Bibliography. O BSl07-2000 Page 9 EN 1946-4:2000 NOTE 2 The error propagation applied in equation (1) and those defining R, and U makes possible the calculation of the error in R, or U when the error affecting each of the quantities appearing in them is kn

47、own. Errors can be divided into those encountered when testing homogeneous specimens in ideal conditions and those additionally encountered when testing inhomogeneous specimens (i.e. the majority of hot box measurements). When testing inhomogeneous specimens the estimation of errors follows the same

48、 guidelines and principles, but the evaluation of the lateral imbalance heat flow rate cD2, the flanking heat flow rate cD4, the area A through which the heat flow rate cD1 is transferred and surface temperatures becomes increasingly difficult with increasing inhomogeneities. 4.4.2.2 Guarded hot box

49、 errors Figure 1 shows, for a guarded hot box, the link between error heat flow rates and temperature and surface coefficient non-uniformities and imbalances. In figure 1 the first subscript has the conventional meaning of hot box methods (s for surface, a for air and r for radiation); the second and third subscripts indicate the elements involved in the heat transfer considered (g for the guard box, s for the specimen, m for the metering area or the air enclosed in it, b for the surfaces of the metering box). The subscript s for surfac