EN 1946-5-2000 en Thermal Performance of Building Products and Components - Specific Criteria for the Assessment of Laboratories Measuring Heat Transfer Properties - Part 5 Measure.pdf

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1、Thermal performance of building products and components - Specific criteria for the assessment of laboratories measuring heat transfer properties - Part 5: Measurements by pipe test methods The European Standard EN 194652000 has the status of a British Standard ICs 91.100.01; 91.120.10 1s EN .946-5

2、:2000 NO COPYING WITROUT BSI PERMISSION EXCEPT AS PERMIITED BY COPYRIGHT LAW STD=BSI BS EN LSqb-5-ENGL 2000 = Lb29bb7 OBbbSbb 2T7 = BS EN 1946-6:2cruU AmdNo. National foreword Date Comments This British Standard is the official English language version of EN 1946452000. The UK participation in its p

3、reparation was entrusted by Technical Committee RHE/s, Therma insulaihg materials, to Subcommittee RHE/9/2, Thermal performance of insulating materials, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - mon

4、itor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UIC A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standard

5、s which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entied “Intedod Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not

6、purport to include all the necessary provisions of a conha 91.120.10 English version Thermal performance of building products and components - Specific criteria for the assessment of laboratories measuring heat transfer properties - Part 5: Measurements by pipe test methods Performance thermique des

7、 produits et composants pour le btiment - Critres particuliers pour lvaluation des laboratoires mesurant les proprits de transmission thermique - Partie 5: Mesurage selon les mthodes dessai des conduites Wrmtechnisches Verhalten von Bauprodukten und Bauteilen - Technische Kriterien von Begutachtung

8、von Laboratorien bei der Durchfhrung der Messungen von Wrmebertragungseigenschaften - Teil 5: Messungen nach dem Rohrprufgerat- Verfahren This European Standard was approved by CEN on 10 April 2000. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditi

9、ons for giving this European Standard the status of a national standard without any alteration. Up-to-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 of

10、ficial versions (English, French, German). A version in any other language made by traislation under the 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

11、, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FOR NORMUNG Central Secreta

12、riat: rue de Stassart, 36 8-I050 Brussels O 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1946-52000 E STDDBSI BS EN LSqb-5-ENGL 2000 m lb21ibb7 OBbb7bB O7T m Page 2 EN 1946-5 2000 Contents Page Foreword 3 . 1 2 scope. 4 Nor

13、mative references . . 4 3 Definitions 5 . 4 5 Equipment manual 5 Calibration and maintenance files . 14 Measurement procedure document 15 6 . Assessmen t. 15 7 . Annex A (normative) Limits for equipment performance and test conditions - 16 Pipe test methods 28 Bibliography, . O BSI 08-2000 Page 3 EN

14、 1946-5:2000 Foreword This European Standard has been prepared by Technical Committee CENTC 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 iden

15、tical text or by endorsement, at the latest by November 2000, and conflicting national standards shall be withdrawn at the latest by November 2000. According to the CENLENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European S

16、tandard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This European Standard is divided into parts. The first part covers common criteria applicable

17、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 5:

18、Measurements by the guarded hot plate method; Measurements by the heat flow meter method; Measurements by hot box methods; Measurements by pipe test methods. Annex A of this European Standard is normative, the Annexes B and C are informative. O BSI 08-2000 STD*BSI BS EN LSqb-5-ENGL 2000 Lb2qbbS OBbb

19、970 728 H Page 4 EN 1946-5:2000 1 Scope Part 5 ofthis standard provides specific technical criteria for the assessment of laboratories to undertake steady-state heat transfer property measurements on circular pipe insulation according to EN IS0 8497: 1994. It complements the common criteria in Part

20、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 information on mandatory equipment performance specifications, on equipment description and on calculations for the equipment desig

21、n and error analysis based on both EN IS0 8497: 1994 on circular pipe apparatus and on Part 2 of this standard on the assessment of guarded hot plate apparatus. It gives information on experimental procedures suitable for the assessment of equipment accuracy, based on both EN IS0 8497: 1994 on circu

22、lar pipe apparatus and on Part 2 of this standard on the assessment of guarded hot plate apparatus. 2 Normative references This European Standard incorporates by dated or undated reference, provisions fkom other publications. These normative references are cited at the appropriate places in the text

23、 and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies

24、. EN 1946- 1 1999, EN 1946-2: 1999, EN 12667l) , EN IS0 7345, EN IS0 8497: 1994, prEN 13467: 1999, Thermal performance of building products and components - Spec$c criteria for the assessment of laboratories measuring heat transfer properties - Part I: Common criteria Thermal performance of building

25、 products and components - Specijk criteria for the assessment of laboratories measuring heat transfer properties - Part 2: Measurements by guarded hotplate method Thermal performance of building materials and products - Determination of thermal resistance by means of guarded hotplate and heat jlow

26、meter methoh - Products of high and medium thermal resistance Thermal insulation - Physical quantities and dejhitions flS0 7345: 1987) Thermal insulation - Determination of steady-state thermal transmission properiies of thermal insulation for circular pipes (IS0 8497: 1994) Thermal insulating produ

27、cts for building equipment and industrial installations - Determination of dimensions, squareness and linearis, ofpreformedpipe insulation I) To be published Q BSI 08-2000 Page 5 EN 1946-5:2000 3 Definitions For the purposes of this part of the standard, the terms and definitions given in Part 1 of

28、this standard, EN IS0 7345 and EN IS0 8497: 1994 apply. 4 Equipment manual 4.1 General The equipment manual shall provide the information specified in 5.2.2 to 5.2.5 of Part 1 of this standard and the information specified in this clause. NOTE: Information common to more than one piece of equipment

29、need not be duplicated, e.g. the principle, details of the design and operation of two pieces of equipment built to a common design. Annex A gives all limiting values indicated in EN IS0 8497: 1994 for equipment performance and testing conditions. This annex shall be used as a check list during the

30、assessment process by the parties concerned to ensure compliance with all EN IS0 8497: 1994 requirements. 4.2 Equipment performance specifications The upper and lower limits of the relevant tested properties and testing conditions, including possible interactions between them, shall be specified: -

31、- - - minimum cold side temperature; - maximum hot side temperature; - surrounding environment (temperature, relative humidity) at the ends of the specimen during the test, if required. minimum and maximum external diameter of the specimen; minimum and maximum specimen thermal resistance; minimum an

32、d maximum temperature difference across the specimen; 4.3 Equipment description The following information shall be documented and shall be available for examination during the assessment: - - principle of operation (see clause 1 of EN IS0 8497:1994); type of apparatus: guarded-end apparatus, see 7.3

33、 of EN IS0 8497: 1994, or calibratedcalculated-end apparatus, see 7.4 of EN IS0 8497: 1994; principal dimensions of apparatus, in particular length of test pipe centre, test pipe guard, test pipe diameter and gap width; simple diagrams illustrating the design of the equipment with special attention

34、to the gap design (see clause 7.3 of EN IS0 8497: 1994), cap design (if applicable, see 7.4 of EN IS0 8497: 1994), jacket or added insulation (if applicable see 7.1 1 of EN IS0 8497: 1994); position, connections and numbering of temperature sensors (see 7.6 of EN IS0 8497: 1994); ambient control and

35、 main ancillary equipment (see 7.8 to 7.10 of EN IS0 8497: 1994); details of data acquisition system and related computer programs for data analysis. - - - - - To avoid duplication, reference may be made to manuals supplied by the instrument manufacturers or to relevant clauses of EN IS0 8497: 1994.

36、 O BSI 08-2000 Page 6 EN 1946-5:2000 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 on the design guidelines followed, and the error analysis. Some guidelines on error analysis are giv

37、en in this subclause; more specific information on some errors is supplied in Annex B, while error calculations are supplied in Annex C for some typical cases. For equipment having characteristics exactly as indicated in this subclause, or design details as indicated in Annex C, no further calculati

38、ons are needed. In other circumstances similar calculations can be performed by analogy. 4.4.2 Axial heat flow rate and maximum specimen thickness 4.4.2.1 General The axial heat flow rate from the test section to the guard sections of the specimen affects the maximum specimen thickness. The axial he

39、at flow rate shall not exceed that permitted by 9.5.2.2 of EN IS0 8497: 1994 (1 % of heat flow rate of the test section, i.e. the end heat loss error shall be less than 1 %). 4.4.2.2 Guarded-end apparatus Table 1 shows for some apparatus having an overall pipe length of 1000 mm and other dimensions

40、as given in the table, the maximum allowed specimen thickness according to the equations proposed in Annex B. Those expressions are based on 2.2.1 of IS0 8302:1991, see i in the Bibliography, when there is no end insulation and when the end temperature ratio, e, is O; e is defined as (Te - T,)/(T, -

41、 T,) , where Ti and T2 are respectively the temperatures of the hot and cold surfaces of the specimen, and Te is the temperature at the ends of the specimen, assumed to be uniform. NOTE: The end heat loss error is zero for homogeneous isotropic specimens whene is close to 0,5; the absolute value of

42、the edge heat loss error increases almost symmetrically whene deviates on either side from 03. In the range O I e I 1, this error is maximum for for e = O. EXAMPLE: A temperature of the specimen ends of 50 OC, a temperature of the specimen cold side of 50 OC (so that the temperature difference betwe

43、en the ends and the cold side of the specimen is O OC) and a temperature of the specimen hot side of 150 OC (so that the temperature difference between the hot and cold side of the specimen is 100 OC) corresponds to e = O. If the temperature of the specimen ends were of 60 OC, then it would be e = O

44、, 1. The data of the table can be applied to apparatus and specimens having all the dimensions multiplied by the same factor. Interpolation is allowed. EXAMPLE: By considering a multiplying factor of 2,4, an apparatus has an overall pipe length of 1 O00 x 2,4 = 2 400 mm, the pipe centre length of 80

45、0 x 2,4 = 1 920 mm and a pipe diameter of 100 x 2,4 = 240 mm. The resulting maximum specimen thickness, see the third line of Table 1, is 70 x 2,4 = 170 mm (rounded to two significant figures). O BSI 08-2000 STDDBSI BS EN L74b-5-ENGL 2000 D Lb24bb9 Obb973 437 W Overall pipe Pipe centre length length

46、 1 O00 400 1 O00 700 1 O00 800 1 O00 400 1 O00 700 1 O00 800 1 O00 400 1 O00 700 1 O00 800 1 O00 400 1 O00 700 1 O00 800 1 O00 400 1 O00 700 1 O00 800 Page 7 EN 1946-512000 Dimensions in millimc Pipe guard Pipe diameter Maximum specimen thickness width 300 1 O0 125 150 1 O0 90 1 O0 1 O0 70 300 50 11

47、0 150 50 75 1 O0 50 60 300 25 90 150 25 65 1 O0 25 50 300 12,5 80 150 12,5 55 1 O0 12,5 45 300 6 65 150 6 45 1 O0 6 35 Table 1 - Maximum allowed specimen thickness for guarded end apparatus Larger specimen thicknesses can be used for some specimens if insulation or temperature control is used at the

48、 ends of the specimen, or if auxiliary guards are installed. res When the maximum specimen thickness to be specified according to 4.2 exceeds the appropriate value given in Table 1, the axial heat flow rate shall be calculated. If, according to these calculations, the axial heat flow rate exceeds th

49、e values permitted by EN IS0 8497: 1994, the performance check data shall be examined and, if no experimental evidence exists to substantiate the claimed maximum specimen thickness, the maximum specimen thickness to be specified according to 4.2 shall be reduced. 4.4.2.3 Calibrated or calculated-end type apparatus When corrections are applied for axial heat flow rate either through the calibration procedure indicated in 10.1 of EN IS0 8497:1994 or through the calculations indicated in 10.2 of EN IS0 8497:1994, the correction should not be larger than 3 % of