ISO INTERNATIONAL STANDARD 10211 Second edition 2017-06 Thermal bridges in building construction Heat flows and surface temperatures Detailed calculations Ponts thermiques dans les batiments -Flux thermiques et températures superficielles Calculs détaillés Reference number IS0 10211:2017(E) International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS underI ted without license from IHS IS0 10211:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS02017,PublishedinSwitzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Intenationaibr PrganizationforStandardization icensee-ZHEJIANG INST.OF STANDARDIZRoISQ s1.7 - All rights reserved Not for Resale, 2017/9/12 02:45:58 etworking permitted without license from IHS IS0 10211:2017(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Symbols and subscripts. 4.1 Symbols .7 4.2 Subscripts. .7 5 Description of the method .8 5.1 Output. ..8 5.2 General description. 6 Output data and input data 6.1 Outputdata ..8 6.2 Calculation time intervals 6.3 Inputdata. .9 7 Modelling of the construction. .9 7.1 Dimension systems 7.2 Rules for modelling. 9 7.2.1 General ..9 7.2.2 Cut-off planes for a 3-D geometrical modelfor calculation of total heat flow and/or surface temperatures .9 7.2.3 Cut-off planes for a 2-D geometrical model 11 7.2.4 Cut-off planes in the ground 12 7.2.5 Periodic heat flows via the ground .13 7.2.6 Adjustments to dimensions .13 7.2.7 Auxiliary planes.. ..15 7.2.8 Quasi-homogeneous layers and materials .15 7.3 Conditions for simplifying the geometrical model ..15 7.3.1 General. .15 7.3.2 Conditions for adjusting dimensionsto simplifythegeometricalmodel. ..16 7.3.3 Conditions for using quasi-homogeneous material layers to simplify the geometrical model. ..17 8 Input data specifications. .20 8.1 General 20 8.2 Thermal conductivities of materials 21 8.3 Surface resistances.. 21 8.4 Boundary temperatures. 21 8.5 Thermal conductivity of quasi-homogeneous layers 21 8.6 Equivalent thermal conductivity of air cavities. .21 8.7 Determining the temperature in an adjacent unheated room .22 9 Calculation method .22 9.1 Solution technique. .22 9.2 Calculation rules 22 9.2.1 Heat flows between material cells and adjacent environment. .22 9.2.2 Heat flows at cut-off planes .22 9.2.3 Solution of the formulae. 22 9.2.4 Calculation of the temperature distribution 23 10 Determination of thermal coupling coefficients and heat flow rate from 3-D calculations23 10.1 Two boundary temperatures, unpartitioned model 23 10.2 Two boundary temperatures, partitioned model. 23 iii nsee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ed withoutlicensefrom IHS Not for Resale, 2017/9/12 02:45:58