DIN EN 675-2011 Glass in building - Determination of thermal transmittance (U value) - Heat flow meter method German version EN 675 2011《建筑玻璃 热传递系数(U值)测定 热流计法 德文版本EN 675-2011》.pdf

《DIN EN 675-2011 Glass in building - Determination of thermal transmittance (U value) - Heat flow meter method German version EN 675 2011《建筑玻璃 热传递系数(U值)测定 热流计法 德文版本EN 675-2011》.pdf》由会员分享，可在线阅读，更多相关《DIN EN 675-2011 Glass in building - Determination of thermal transmittance (U value) - Heat flow meter method German version EN 675 2011《建筑玻璃 热传递系数(U值)测定 热流计法 德文版本EN 675-2011》.pdf（16页珍藏版）》请在麦多课文档分享上搜索。

1、September 2011 Translation by DIN-Sprachendienst.English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).

2、ICS 81.040.20!$tGf“1813667www.din.deDDIN EN 675Glass in building Determination of thermal transmittance (U value) Heat flow meter methodEnglish translation of DIN EN 675:2011-09Glas im Bauwesen Bestimmung des Wrmedurchgangskoeffizienten (U-Wert) Wrmestrommesser-VerfahrenEnglische bersetzung von DIN

3、EN 675:2011-09Verre dans la construction Dtermination du coefficient de transmission thermique, U Mthode du fluxmtreTraduction anglaise de DIN EN 675:2011-09SupersedesDIN EN 675:1999-01www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises pag

4、es08.1116DIN EN 675:2011-09 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 129 “Glass in building” (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building a

5、nd Civil Engineering Standards Committee), Working Committee NA 005-09-91 AA Prfung von Beschichtungen auf Glas. Amendments This standard differs from DIN EN 675:1999-01 as follows: a) the internal and external heat transfer coefficients have been adjusted to reflect the modifications made in EN 673

6、; b) the standard has been editorially revised. Previous editions DIN 52619-2: 1985-02 DIN EN 675: 1999-01 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 675 June 2011 ICS 81.040.20 Supersedes EN 675:1997English Version Glass in building - Determination of thermal transmittance Verre dans la

7、 construction - Dtermination du coefficient de transmission thermique, U - Mthode du fluxmtre Glas im Bauwesen - Bestimmung des Wrmedurchgangskoeffizienten (U-Wert) - Wrmestrommesser-Verfahren This European Standard was approved by CEN on 12 May 2011. CEN members are bound to comply with the CEN/CEN

8、ELEC Internal Regulations which stipulate the conditions for giving this European Standard 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

9、or to any CEN member. This European Standard exists in three official versions (English, 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 of

10、ficial versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, S

11、lovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldw

12、ide for CEN national Members. Ref. No. EN 675:2011: E(U value) - Heat flow meter method EN 675:2011 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Terms and definitions .54 Basic formula .65 Brief outline of the measuring procedure .66 Test apparatus .67 Calibration

13、of the test apparatus . 108 Dimensions of the specimens . 109 Preparation of the specimens . 1010 Performance of the measurements. 1111 Evaluation of the results 1111.1 Thermal resistance of the multiple glazing 1111.2 Declared U value . 1111.3 Design U value 1212 Expression of results . 1212.1 U va

14、lues . 1212.2 Thermal resistance . 1212.3 Intermediate values 1213 Test report . 1213.1 Identification of the specimens . 1213.2 Cross section of the specimen 1313.3 Results . 13Bibliography . 14DIN EN 675:2011-09 EN 675:2011 (E) 3 Foreword This document (EN 675:2011) has been prepared by Technical

15、Committee CEN/TC 129 “Glass in building”, the secretariat of which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2011, and conflicting national standards shall be withdr

16、awn at the latest by December 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 675:1997. The main cha

17、nge in this edition is that the internal and external heat transfer coefficients have been amended slightly to reflect changes to EN 673. Clarification is also given in the scope that the procedure specified in this European Standard should generally only be considered when the calculation method de

18、tailed in EN 673 is inappropriate or unsuitable. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, F

19、rance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 675:2011-09 EN 675:2011 (E) 4 Introduction CEN/TC 129/WG 9 “Light and energy t

20、ransmission, thermal insulation“ prepared a working draft based on the document ISO/DIS 10293 “Glass in building - Determination of steady-state U values (thermal transmittance) of multiple glazing - Heat flow meter method“, document that was prepared by ISO/TC 160, “Glass in building“. This was pub

21、lished in 1997 as EN 675. The document for the calculation of the overall U value of windows, doors and shutters (see 2) gives normative reference to the U value evaluated for the glazing components according to this standard. For the purposes of product comparison, a vertical position of the glazin

22、g is specified (see Clause 10). U values evaluated according to the present standard are used for product comparison as well as for other purposes, in particular for predicting: heat loss through glazing; conduction heat gains in summer; condensation on glazing surfaces; the effects of the absorbed

23、solar radiation in determining the solar factor (see 1). Reference should be made to 2, 3, 4 or other European Standards dealing with heat loss calculations for the application of glazing U values determined by this Standard. DIN EN 675:2011-09 EN 675:2011 (E) 5 1 Scope This European Standard specif

24、ies a measurement procedure to determine the thermal transmittance of glazing with flat and parallel surfaces. For the purpose of this Standard, structured surfaces may be considered to be flat This European Standard applies to multiple glazing with outer panes which are not transparent to far infra

25、red radiation (in the wavelength range 5m to 50m), which is the case for soda lime silicate glass products, borosilicate glass and glass ceramics. Internal elements can be far infrared transparent. The procedure specified in this European Standard determines the U value (thermal transmittance) in th

26、e central area of glazing. The edge effects due to the thermal bridge through the spacer of an insulating glass unit or through the window frame are not included. Energy transfer due to solar radiation is also excluded. The procedure specified in this European Standard should be considered only when

27、 the thermal transmittance of the glazing cannot be calculated in accordance with EN 673. The determination of the thermal transmittance is performed for conditions which correspond to the average situation for glazing in practice. NOTE Patterned glass is an example of a glass with a structured surf

28、ace; 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 673, Glass in buil

29、ding Determination of thermal transmittance (U value) Calculation method EN 12898, Glass in building Determination of the emissivity ISO 8301, Thermal insulation Determination of steady-state thermal resistance and related properties Heat flow meter apparatus ISO 8302, Thermal insulation Determinati

30、on of steady-state thermal resistance and related properties Guarded hot plate apparatus 3 Terms and definitions For the purposes of this document, the following terms and definitions apply: 3.1 U value parameter of glazing which characterizes the heat transfer through the central part of the glazin

31、g, i.e. without edge effects, and states the steady-state density of heat transfer rate per temperature difference between the environmental temperatures on each side. NOTE The U value is given in watts per square metre Kelvin W/(m2K) 3.2 declared value U value obtained under standardized boundary c

32、onditions. NOTE See 11.2. DIN EN 675:2011-09 EN 675:2011 (E) 6 4 Basic formula The U value depends on the thermal resistance of the multiple glazing and on the external and internal surface heat transfer coefficients according to the relation: 1U= R +1he+1hi(1) where R is the thermal resistance of t

33、he multiple glazing in square metres Kelvins per Watt ()mKW2heis the external surface heat transfer coefficient in watts per square metre Kelvin ()W/ m K2hi is the internal surface heat transfer coefficient in watts per square metre Kelvin ()W/ m K2According to this standard the surface to surface t

34、hermal resistance is determined by measurements taken using the heat flow meter method. Thereupon the declared U value is determined according to Equation (1) with the values for the internal and external heat transfer coefficients specified in 11.2. The external surface is the surface of the glazin

35、g intended to face the outside of the building in use. The internal surface is the surface of the glazing intended to face the inside of the building in use. 5 Brief outline of the measuring procedure The surface to surface thermal resistance of the multiple glazing is determined by means of the hea

36、t flow meter method laid down in ISO 8301. The recommendations of that standard shall be complied with except for variations contained in this standard and for variations resulting from the special structure of the specimen. Within the present context further requirements are necessary, viz. the siz

37、e of the test specimens and the performance of the measurements are laid down to meet special requirements for measuring multiple glazing (see Clauses 6 to 13). 6 Test apparatus For the measurement of the thermal resistance of the specimen, the single-specimen apparatus with symmetrical configuratio

38、n or a double specimen apparatus as shown in Figures 1 and 2 is used. The single-specimen apparatus consists of a heating and a cooling unit between which the specimen or a reference sample for the calibration of the apparatus is sandwiched. The cooling unit has surface dimensions as large as those

39、of the heating unit. A heat flow meter is positioned in the centre of the hot plate surface and the cold plate surface. These heat flow meters face each other on either sides of the specimen or the reference sample. On each side of the heat flow meters a thin natural or synthetic foam rubber sheet i

40、s placed to ensure sufficient thermal contact. Surface contact is obtained by applying pressure. The foam rubber sheets have the same dimensions as the surface area of the heating unit. DIN EN 675:2011-09 EN 675:2011 (E) 7 The double-specimen apparatus consists of a heating unit and two outer coolin

41、g units. The heating unit is sandwiched between the specimen to be measured and a control sample. For calibration a reference sample shall be introduced at the position of the specimen. On each side of the reference sample/specimen and the control sample heat flow meters are placed. On each side of

42、the heat flow meters a thin foam rubber sheet is placed to ensure sufficient thermal contact. The surface dimensions of all elements and the positioning of the heat flow meters in the central area of the assembly are the same as for the single specimen apparatus. For both apparatus the heating unit

43、shall be of such a size as to completely cover the surface of the reference sample/specimen and in the case of the double apparatus of the control sample. Heat losses from the outer edges of the heat flow meter apparatus shall be restricted by edge insulation or by controlling the surrounding air te

44、mperature or by both. For both apparatus the metering area of the heat flow meters shall have a circular or square shape and a minimum size of 75 cm. Its maximum size shall lie within an area of 50 cm x 50 cm. The metering area shall further be surrounded by a protective zone consisting of the same

45、material in the same thickness (with a tolerance of 0,1 mm) covering the whole sample area (see Figures 1 and 2). Thermocouples are mounted in pairs. They are positioned to face each other and shall have direct contact to the surfaces of the reference sample/specimen and in the case of the double ap

46、paratus the control sample. At least three thermocouple positions shall be chosen, one positioned in the centre of the metering area of the heat flow meters and two others diametrically opposite in a distance of 2/3 from the centre of the metering area to its perimeter. Additional thermocouples may

47、be arranged in such a way that an optimum cover of the metering area is achieved. Such thermocouples shall have a thickness not exceeding 0,2 mm; the junctions shall be flattened so as not to exceed 0,2 mm and a contact material (e.g. zinc oxide loaded silicon grease or metal tape) shall be used to

48、insure a good thermal contact between the junction and the specimen. DIN EN 675:2011-09 EN 675:2011 (E) 8 Dimensions in millimetres Key metering area of the heat flow meter insulating material protective zone thin foam rubber sheet 1 heating unit 2 specimen 3 cooling unit” Figure 1 Single-specimen a

49、pparatus DIN EN 675:2011-09 EN 675:2011 (E) 9 Dimensions in millimetres Key metering area of the heat flow meter insulating material protective zone thin foam rubber sheet 1 cooling unit 2 specimen 3 heating unit 4 - control sample 5 cooling unit Figure 2 Double-specimen apparatus DIN EN 675:2011-09 EN 675:2011 (E) 10 7 Calibration of the test apparatus The heat flow meter method is a relative measuring method since the ratio of the thermal resist