ISO INTERNATIONAL STANDARD 10077-2 Third edition 2017-06 Thermal performance of windows, doors and shutters Calculation of thermal transmittance - Part 2: Numerical method for frames Performance thermique des fenetres, portes et fermetures - Calcul du coefficient de transmission thermique Partie 2: Methode numérique pour les encadrements Reference number IS0 10077-2:2017(E) rso International Organization for Standardization @ IS0 2017 ed without license from IHS IS0 10077-2:2017(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 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 [email protected] www.iso.org Internatinair PrganizationforStandardization ensee-ZHEJIANG INSTOF STANDARDIzARoISQa7 - All rights reserved Not for Resale, 2017/9/12 02:36:36 etworking permitted without license from IHS IS0 10077-2:2017(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Terms and definitions ..2 4 Symbols and subscripts. ..2 4.1 Symbols . 2 4.2 Subscripts. .3 5 Calculation method .3 5.1 Output of the method .3 5.2 General principle. .3 5.3 Validation of the calculation programs. .4 6 Calculation of thermal transmittance .4 6.1 Output data ..4 6.2 Calculation time intervals 4 6.3 Inputdata. .4 6.3.1 Geometrical characteristics 4 6.3.2 Thermal conductivity values. ..5 6.3.3 Emissivity of surfaces. .6 6.3.4 General boundaries .6 6.3.5 Boundaries for roller shutter boxes .6 6.4 Calculation procedures .7 6.4.1 Determination of thermal transmittance 7 6.4.2 Treatment of cavities using the radiosity method .8 6.4.3 Treatment of cavities using the single equivalent thermal conductivity method 18 7 Report .24 7.1 Contents of report 24 7.2 Geometricaldata 24 7.3 Thermal data. 25 7.3.1 Thermal conductivity .25 7.3.2 Emissivity. .25 7.3.3 Boundary conditions. .25 7.4 Presentationofresults .25 Annex A (normative) Input and method selection data sheet - Template ..26 Annex B (informative) Input and method selection data sheet - Default choices ..28 Annex C (normative) Regional references in line with Iso Global Relevance Policy .30 Annex D (normative) Thermal conductivity and other characteristics of selected materials ..31 Annex E (normative) Surface resistances.. ..34 Annex F (normative) Determination of the thermal transmittance .36 Annex G (normative) General examples for the validation of calculation programs using the radiositymethodforthetreatmentofcavities ..40 Annex H (normative) Examples of window frames for the validation of calculation programs using the radiosity method for the treatment of cavities. ..45 Annex I (normative) Examples of window frames for the validation of calculation programs using the single equivalent thermal conductivity method for the treatment of cavities....57 Annex J (normative) Wood species listed in Annex D .68 iii e=ZHEJIANG INST OF STANDARDIZATION C1 5956617 withoutlicense from IHS Not for Resale, 2017/9/12 02:36:36