1、Building components and building elements - Thermal resistance and thermal transmittance - Calculation methodsBS EN ISO 6946:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6946 July 2017 ICS 91.120.10 Supe
2、rsedes EN ISO 6946:2007English Version Building components and building elements - Thermal resistance and thermal transmittance - Calculation methods (ISO 6946:2017) Composants et parois de btiments - Rsistance thermique et coefficient de transmission thermique - Mthodes de calcul (ISO 6946:2017) Ba
3、uteile - Wrmedurchlasswiderstand und Wrmedurchgangskoeffizient - Berechnungsverfahren (ISO 6946:2017) This European Standard was approved by CEN on 27 February 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Stan
4、dard 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 (Englis
5、h, 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, Bu
6、lgaria, 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switz
7、erland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nationa
8、l Members. Ref. No. EN ISO 6946:2017 ENational forewordThis British Standard is the UK implementation of EN ISO 6946:2017. It supersedes BS EN ISO 6946:2007, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/540/2, Building performance - Moisture.A lis
9、t of organizations represented on this committee 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 2017 Published by BSI Standards L
10、imited 2017ISBN 978 0 580 88082 7ICS 91.120.10; 91.060.01Compliance 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 August 2017.Amendments/corrigenda issued since public
11、ationDate Text affectedBRITISH STANDARDBS EN ISO 6946:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6946 July 2017 ICS 91.120.10 Supersedes EN ISO 6946:2007English Version Building components and building elements - Thermal resistance and thermal transmittance - Calculation methods (I
12、SO 6946:2017) Composants et parois de btiments - Rsistance thermique et coefficient de transmission thermique - Mthodes de calcul (ISO 6946:2017) Bauteile - Wrmedurchlasswiderstand und Wrmedurchgangskoeffizient - Berechnungsverfahren (ISO 6946:2017) This European Standard was approved by CEN on 27 F
13、ebruary 2017. CEN members are bound to comply with the CEN/CENELEC 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
14、 obtained on application to the CEN-CENELEC Management Centre 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 t
15、he CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ir
16、eland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Mana
17、gement Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6946:2017 EBS EN ISO 6946:2017EN ISO 6946:2017 (E) 2 European Foreword This document (EN ISO 6946:2017) has been prepared by
18、Technical Committee ISO/TC 163 “Thermal performance and energy use in the built environment“ in collaboration with 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 n
19、ational standard, either by publication of an identical text or by endorsement, at the latest by January 2018 and conflicting national standards shall be withdrawn at the latest by January 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of pa
20、tent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This document is part of the set of standards and accompanying technical repo
21、rts on the energy performance of buildings and has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association (Mandate M/480, see reference EF3 below). Directive 2010/31/EU recasting the Directive 2002/91/EC on energy performance of buildings (EPBD,
22、 EF4) promotes the improvement of the energy performance of buildings within the European Union, taking into account all types of energy uses (heating, lighting, cooling, air conditioning, ventilation) and outdoor climatic and local conditions, as well as indoor climate requirements and cost effecti
23、veness (Article 1). The directive requires Member States to adopt measures and tools to achieve the prudent and rational use of energy resources. In order to achieve those goals, the EPBD requires increasing energy efficiency and the enhanced use of renewable energies in both new and existing buildi
24、ngs. One tool for this is the application by Member States of minimum requirements on the energy performance of new buildings and for existing buildings that are subject to major renovation, as well as for minimum performance requirements for the building envelope if energy-relevant parts are replac
25、ed or retrofitted. Other tools are energy certification of buildings, inspection of boilers and air-conditioning systems. The use of European standards increases the accessibility, transparency and objectivity of the energy performance assessment in the Member States facilitating the comparison of b
26、est practices and supporting the internal market for construction products. The use of EPB standards for calculating energy performance, as well as for energy performance certification and the inspection of heating systems and boilers, ventilation and air-conditioning systems will reduce costs compa
27、red to developing different standards at national level. The first mandate to CEN to develop a set of CEN EPBD standards (M/343, EF1), to support the first edition of the EPBD (EF2) resulted in the successful publication of all EPBD related CEN standards in 2007-2008. Mandate M/480 was issued to rev
28、iew the mandate M/343 as the recast of the EPBD raised the need to revisit the standards and reformulate and add standards so that they become on the one hand unambiguous and compatible, and on the other hand a clear and explicit overview of the choices, BS EN ISO 6946:2017EN ISO 6946:2017 (E) 3 bou
29、ndary conditions and input data that need to be defined at national or regional level. Such national or regional choices remain necessary, due to differences in climate, culture and building tradition, policy and legal frameworks. Consequently, the set of CEN EPBD standards published in 2007-2008 ha
30、d to be improved and expanded on the basis of the recast of the EPBD. The EPB standards are flexible enough to allow for necessary national and regional differentiation and facilitate Member States implementation and the setting of requirements by the Member States. Further target groups are users o
31、f the voluntary common European Union certification scheme for the energy performance of non-residential buildings (EPBD article 11.9) and any other regional (e.g. pan European) parties wanting to motivate their assumptions by classifying the building energy performance for a dedicated building stoc
32、k. This document supersedes EN ISO 6946:2007. 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, Form
33、er Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. References: EF1 EPBD, Directive 2
34、002/91/EC of the European Parliament and of the Council of 16 December 2002 on the energy performance of buildings EF2 EPBD Mandate M/343, Mandate to CEN, CENELEC and ETSI for the elaboration and adoption of standards for a methodology calculating the integrated energy performance of buildings and e
35、stimating the environmental impact, in accordance with the terms set forth in Directive 2002/91/EC , 30 January 2004 EF3 Mandate M/480, Mandate to CEN, CENELEC and ETSI for the elaboration and adoption of standards for a methodology calculating the integrated energy performance of buildings and prom
36、oting the energy efficiency of buildings, in accordance with the terms set in the recast of the Directive on the energy performance of buildings (2010/31/EU), 14 December 2010 EF4 EPBD, Recast of the Directive on the energy performance of buildings (2010/31/EU). 14 December 2010 Endorsement notice T
37、he text of ISO 6946:2017 has been approved by CEN as EN ISO 6946:2017 without any modification. BS EN ISO 6946:2017This page deliberately left blank ISO 6946:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 24 Symbols and subscripts . 34.1 Symbols . 34.2 S
38、ubscripts 35 Description of the method 35.1 Output . 35.2 General description . 45.3 Detailed calculation method . 45.4 Simplified calculation method . 46 Calculation of thermal transmittance and thermal resistance 46.1 Output data 46.2 Calculation time intervals 46.3 Input data 46.4 Principles of t
39、he simplified calculation procedure 56.5 Thermal transmittance 66.5.1 By detailed calculation method . 66.5.2 By simplified calculation method 66.6 Thermal resistance 76.7 Total thermal resistance . 76.7.1 Thermal resistance of homogeneous components 76.7.2 Total thermal resistance of a building com
40、ponent consisting of homogeneous and inhomogeneous layers 86.8 Surface resistances . 126.9 Thermal resistance of air layers 126.9.1 Applicability 126.9.2 Unventilated air layer .136.9.3 Slightly ventilated air layer 136.9.4 Well-ventilated air layer . 146.10 Thermal resistance of unheated spaces . 1
41、46.10.1 General. 146.10.2 Roof spaces 146.10.3 Other spaces . 15Annex A (normative) Input and method selection data sheet Template 16Annex B (informative) Input and method selection data sheet Default choices 19Annex C (normative) Surface resistances .22Annex D (normative) Thermal resistance of airs
42、paces25Annex E (normative) Calculation of the thermal transmittance of components with tapered layers .29Annex F (normative) Correction to thermal transmittance 34Bibliography .40 ISO 2017 All rights reserved iiiContents PageISO 6946:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references
43、13 Terms and definitions . 24 Symbols and subscripts . 34.1 Symbols . 34.2 Subscripts 35 Description of the method 35.1 Output . 35.2 General description . 45.3 Detailed calculation method . 45.4 Simplified calculation method . 46 Calculation of thermal transmittance and thermal resistance 46.1 Outp
44、ut data 46.2 Calculation time intervals 46.3 Input data 46.4 Principles of the simplified calculation procedure 56.5 Thermal transmittance 66.5.1 By detailed calculation method . 66.5.2 By simplified calculation method 66.6 Thermal resistance 76.7 Total thermal resistance . 76.7.1 Thermal resistance
45、 of homogeneous components 76.7.2 Total thermal resistance of a building component consisting of homogeneous and inhomogeneous layers 86.8 Surface resistances . 126.9 Thermal resistance of air layers 126.9.1 Applicability 126.9.2 Unventilated air layer .136.9.3 Slightly ventilated air layer 136.9.4
46、Well-ventilated air layer . 146.10 Thermal resistance of unheated spaces . 146.10.1 General. 146.10.2 Roof spaces 146.10.3 Other spaces . 15Annex A (normative) Input and method selection data sheet Template 16Annex B (informative) Input and method selection data sheet Default choices 19Annex C (norm
47、ative) Surface resistances .22Annex D (normative) Thermal resistance of airspaces25Annex E (normative) Calculation of the thermal transmittance of components with tapered layers .29Annex F (normative) Correction to thermal transmittance 34Bibliography .40 ISO 2017 All rights reserved iiiContents Pag
48、eBS EN ISO 6946:2017ISO 6946:2017(E)ForewordISO (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 in
49、terested in 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 Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different
