ISO INTERNATIONAL STANDARD 13786 Third edition 2017-06 Thermal performance of building components Dynamic thermal characteristics Calculation methods Performance thermique des composants de batiment- Caractéristiques thermiques dynamiques - Méthodes de calcul Reference number IS0 13786:2017(E) os1 International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS underI IS0 13786:2017(E) COPYRIGHTPROTECTEDDOCUMENT 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 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 PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZRoISQ s1.7 - All rights reserved etworking permitted without license from IHS IS0 13786:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions ..1 3.1 Definitions valid for any component . 2 3.2 Definitions valid only for one dimensional heat flow 3.3 Other .5 4 Symbols and subscripts .5 4.1 .5 Symbols. 4.2 Subscripts .6 4.3 Specific symbols. .6 5 Description of the method .6 5.1 Output. .6 5.2 General description .6 6 Calculation of dynamic thermal properties .6 6.1 Output data .6 6.2 Calculation time intervals .7 6.3 Inputdata 1 6.4 Period of the thermal variations .8 6.5 Heat capacity .8 7 Heat transfer matrix of a multi-layer component .8 7.1 General 8 7.2 Procedure .8 7.3 Heat transfer matrix of a homogeneous layer .9 7.4 Heat transfer matrix of plane air cavities ..9 7.5 Heat transfer matrix of a building component .9 8 Dynamic thermal characteristics .10 8.1 Characteristics for any component. .10 8.2 Characteristics for components consisting of plane and homogeneous layers ..10 8.2.1 Thermal admittances and periodic thermal conductances .10 8.2.2 Modifiedadmittanceforinternalpartitions ..10 8.2.3 Areal heat capacities. ..10 8.2.4 Periodic thermal transmittance and decrement factor ..1 9 Report .11 9.1 Calculation report. ..11 9.2 Summary of results ..12 Annex A (normative) Input and method selection data sheet - Template ..13 Annex B (informative) Input and method selection data sheet - Default choices ..15 Annex C (normative) Simplified calculation of the heat capacity ..17 Bibliography .19 iii =ZHEJIANG INST OF STANDARDIZATION C1 5956617 ed without license from IHS Not for Resale, 2017/9/12 02:46:25