1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 12631:2012Thermal performance ofcurtain walling Calculationof thermal transmittance (ISO12631:2012)BS EN ISO 12631:2012 BRITISH STANDARDNational forewordThis British St
2、andard is the UK implementation of EN ISO 12631:2012. It supersedes BS EN 13947:2006, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/540, Energy performance of materials components and buildings.A list of organizations represented on this committee
3、can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012ISBN 978 0 580 72857 0 ICS 91.120.10
4、Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCH
5、E NORM EN ISO 12631 October 2012 ICS 91.120.10 Supersedes EN 13947:2006English Version Thermal performance of curtain walling - Calculation of thermal transmittance (ISO 12631:2012) Performance thermique des faades-rideaux - Calcul du coefficient de transmission thermique (ISO 12631:2012) Wrmetechni
6、sches Verhalten von Vorhangfassaden - Berechnung des Wrmedurchgangskoeffizienten (ISO 12631:2012) This European Standard was approved by CEN on 30 September 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standar
7、d 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 (English,
8、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, Bulga
9、ria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Tur
10、key and United Kingdom. EUROPEAN 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
11、ISO 12631:2012: EBS EN ISO 12631:2012EN ISO 12631:2012 (E) 3 Foreword This document (EN ISO 12631:2012) has been prepared by Technical Committee CEN/TC 89 “Thermal performance of buildings and building components”, the secretariat of which is held by SIS, in collaboration with Technical Committee IS
12、O/TC 163 “Thermal performance and energy use in the built environment“. 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 April 2013, and conflicting national standards shall be withdrawn at the lat
13、est by April 2013. 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 13947:2006. According to the CEN/CENELE
14、C Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Icel
15、and, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN ISO 12631:2012ISO 12631:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword iv Introduction . v 1
16、 Scope 1 2 Normative references 1 3 Terms, definitions, symbols and units 2 3.1 Terms and definitions . 2 3.2 Symbols and units . 3 3.3 Subscripts 3 3.4 Superscripts . 4 4 Geometrical characteristics . 4 4.1 Main principles 4 4.2 Internal depth . 6 4.3 Boundaries of curtain wall structures . 6 5 Cut
17、-off planes and partitioning of thermal zones 9 5.1 Rules for thermal modelling . 9 5.2 Cut-off planes of the geometrical model . 9 6 Calculation of curtain wall transmittance . 9 6.1 Methodologies . 9 6.2 Single assessment method 10 6.3 Component assessment method . 16 6.4 Thermal transmittance of
18、a curtain wall built of different elements 21 7 Input data . 21 8 Report . 22 8.1 Section drawings . 22 8.2 Overview drawing of the whole curtain wall element 23 8.3 Values used for calculation 23 8.4 Presentation of results 23 Annex A (informative) Guidance for calculating the thermal transmittance
19、 Ucwof curtain walling using the two methods . 24 Annex B (informative) Linear thermal transmittance of junctions . 25 Annex C (normative) A method for calculating the thermal effect of screws using a 2D numerical method and the procedures specified in ISO 10077-2:2012 . 33 Annex D (normative) Venti
20、lated and unventilated air spaces 36 Annex E (informative) Component method: Calculation example . 39 Annex F (informative) Single assessment method: Calculation example 45 Annex G (normative) Parallel routes in normative references . 48 Bibliography 49 BS EN ISO 12631:2012ISO 12631:2012(E) iv ISO 2
21、012 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in
22、a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commissi
23、on (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical c
24、ommittees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall n
25、ot be held responsible for identifying any or all such patent rights. ISO 12631 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 89, Thermal performance of buildings and building components, the secretariat of which is held by SIS, in collaboration with ISO
26、 Technical Committee TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 2, Calculation methods, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). BS EN ISO 12631:2012ISO 12631:2012(E) ISO 2012 All rights reserved vIntr
27、oduction The design and construction of curtain wall systems is complex. This International Standard specifies a procedure for calculating the thermal transmittance of curtain wall structures. Curtain walls often contain different kinds of materials, joined in different ways, and can exhibit numerou
28、s variations of geometrical shape. With such a complex structure, the likelihood of producing thermal bridges across the curtain wall envelope is quite high. The results of calculations, carried out following the procedures specified in this International Standard, can be used for comparison of the
29、thermal transmittance of different types of curtain wall or as part of the input data for calculating the heat used in a building. This International Standard is not suitable for determining whether or not condensation will occur on the structure surfaces nor within the structure itself. Two methods
30、 are given in this International Standard: single assessment method (see 6.2); component assessment method (see 6.3). Guidance on the use of these two methods is given in Annex A. Calculation examples for these two methods are given in Annex E and Annex F. Testing according to ISO 12567-1:2010 is an
31、 alternative to this calculation method. The thermal effects of connections to the main building structure as well as fixing lugs can be calculated according to ISO 10211:2007. The thermal transmittance of the frame, Uf, is defined according to ISO 10077-2:2012 or EN 12412-2:2003 together with Annex
32、 A. The thermal transmittance of glazing units, Ug, is defined according to the documents listed in Table G.1 which does not include the edge effects. The thermal interaction of the frame and the filling element is included in the linear thermal transmittance which is derived using the procedures sp
33、ecified in ISO 10077-2:2012. BS EN ISO 12631:2012BS EN ISO 12631:2012INTERNATIONAL STANDARD ISO 12631:2012(E) ISO 2012 All rights reserved 1Thermal performance of curtain walling Calculation of thermal transmittance 1 Scope This International Standard specifies a method for calculating the thermal t
34、ransmittance of curtain walls consisting of glazed and/or opaque panels fitted in, or connected to, frames. The calculation includes: different types of glazing, e.g. glass or plastic; single or multiple glazing; with or without low emissivity coating; with cavities filled with air or other gases; f
35、rames (of any material) with or without thermal breaks; different types of opaque panels clad with metal, glass, ceramics or any other material. Thermal bridge effects at the rebate or connection between the glazed area, the frame area and the panel area are included in the calculation. The calculat
36、ion does not include: effects of solar radiation; heat transfer caused by air leakage; calculation of condensation; effect of shutters; additional heat transfer at the corners and edges of the curtain walling; connections to the main building structure nor through fixing lugs; curtain wall systems w
37、ith integrated heating. 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. IS
38、O 6946:2007, Building components and building elements Thermal resistance and thermal transmittance Calculation method ISO 7345:1987, Thermal insulation Physical quantities and definitions BS EN ISO 12631:2012ISO 12631:2012(E) 2 ISO 2012 All rights reservedISO 10077-1:2006, Thermal performance of wi
39、ndows, doors and shutters Calculation of thermal transmittance Part 1: General ISO 10077-2:2012, Thermal performance of windows, doors and shutters Calculation of thermal transmittance Part 2: Numerical method for frames ISO 10211:2007, Thermal bridges in building construction Heat flows and surface
40、 temperatures Detailed calculations ISO 10291:1994, Glass in building Determination of steady-state U values (thermal transmittance) of multiple glazing - Guarded hot plate method ISO 10292:1994, Glass in building Calculation of steady-state U values (thermal transmittance) of multiple glazing ISO 1
41、0293:1997, Glass in building Determination of steady-state U values (thermal transmittance) of multiple glazing - Heat flow meter method ISO 12567-1:2010, Thermal performance of windows and doors Determination of thermal transmittance by hot box method Part 1: Complete windows and doors EN 673:2011,
42、 Glass in building Determination of thermal transmittance (U value) Calculation method EN 674:2011, Glass in building Determination of thermal transmittance (U value) Guarded hot plate method EN 675:2011, Glass in building Determination of thermal transmittance (U value) Heat flow meter method EN 12
43、412-2:2003, Thermal performance of windows, doors and shutters Determination of thermal transmittance by hot-box method Part 2: Frames 3 Terms, definitions, symbols and units 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 7345:1987, ISO 6946:2007
44、and Annex G apply. NOTE Clause 4 includes descriptions of a number of geometrical characteristics of glazing units, frame sections and panels. BS EN ISO 12631:2012ISO 12631:2012(E) ISO 2012 All rights reserved 33.2 Symbols and units Table 1 Symbols and units Symbol Quantity Unit A area m2T thermodyn
45、amic temperature K U thermal transmittance W/(m2K) l length m d depth heat flow rate W linear thermal transmittance W/(mK) difference summation emissivity 3.3 Subscripts cw curtain walling d developed e external eq equivalent f frame f,g frame/glazing FE filling element g glazing i internal j joint
46、m mullion m,f mullion/frame m,g mullion/glazing n normal p panel (opaque) s screw t transom t,f transom/frame t,g transom/glazing tot total TJ thermal joint at a connection between two filling elements W window BS EN ISO 12631:2012ISO 12631:2012(E) 4 ISO 2012 All rights reserved3.4 Superscripts * de
47、finition of areas for length-related treatment of thermal joints (see 6.2.2.3) 4 Geometrical characteristics 4.1 Main principles The main principles of curtain walling are shown in Figures 1 and 2. Key 1 structure fixing bracket A-A vertical section Figure 1 Principle of curtain walling construction
48、: unitised construction BS EN ISO 12631:2012ISO 12631:2012(E) ISO 2012 All rights reserved 5Key 1 structure fixing bracket A-A vertical section Figure 2 Principle of curtain walling construction: stick construction BS EN ISO 12631:2012ISO 12631:2012(E) 6 ISO 2012 All rights reserved4.2 Internal dept
49、h The internal depth is defined as shown in Figure 3. Key 1 internal 2 external diinternal depth of mullion or transom Figure 3 Internal and external developed area, internal depth 4.3 Boundaries of curtain wall structures 4.3.1 General To evaluate the thermal transmittance of faades, representative reference areas should be defined. The following subclauses define the various areas. BS EN ISO 12631:2012ISO 12631:2012(E) ISO 2012 All rights reserve
