ISO INTERNATIONAL STANDARD 12631 Second edition 2017-06 Thermal performance of curtain walling Calculation of thermal transmittance Performance thermique des facades-rideaux - Calcul du coefficient de transmission thermique Reference number IS0 12631:2017(E) International Organization for Standardization @ IS0 2017 see=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under I No reproduction or networking permitted without license from IHS IS0 12631:2017(E) COPYRIGHT PROTECTED DOCUMENT @ IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyrightoffice 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 Internatinir DrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoISQ 07 - All rights reserved No reproduction or networking permited without license from IHS IS0 12631:2017(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Symbols and subscripts. .3 4.1 Symbols .3 4.2 Subscripts. .3 4.3 Superscripts. .3 5 Description of the methods .3 5.1 Output of the method 5.2 General description. .4 5.3 Geometricalcharacteristics .4 5.3.1 Main principles. 4 5.3.2 Internaldepth 5.3.3 Boundaries of curtain wall structures.. ..7 5.3.4 Cut-off planes and partitioning of thermal zones. ..10 6 Methodologies for the calculation of curtain wall transmittance. ..10 7 Single assessment method .12 7.1 Output data ..12 7.2 Calculation time intervals. ..12 7.3 Input data. ..12 7.3.1 Geometrical characteristics .12 7.3.2 Thermal characteristics .16 7.4 Calculation procedure... ..18 7.4.1 Applicable time interval 7.4.2 Calculation of thermal transmittance ..18 8 Component assessment method ..19 8.1 Output data 8.2 Calculation time intervals. .19 8.3 Input data 19 8.3.1 Geometrical characteristics .19 8.3.2 Thermal characteristics .23 8.4 Calculation procedure 26 8.4.1 Applicable time interval. .26 8.4.2 .26 Calculationofthermaltransmittance 9 Report .27 9.1 Contents of report. 27 9.2 Drawings. 28 9.2.1 Section drawings. 28 9.2.2 Overview drawing of the whole curtain wall element 28 9.3 Values used in the calculation. ..28 9.4 Presentation of results. .28 Annex A (normative) Input and method selection data sheet - Template Annex B (informative) Input and method selection data sheet - default choices ...31. Annex C (normative) Regional references in line with Iso Global Relevance Policy ..33 Annex D (normative) Linear thermal transmittance of junctions ..34 iii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under license with ISC ed without license from IHS