ISO INTERNATIONAL STANDARD 15099 First edition 2003-11-15 Thermal performance of windows, doors and shading devices Detailed calculations Performance thermique des fenetres, portes et stores-Calculs détailles Reference number ISO 15099:2003(E) @ISO2003 Copyright Inter No reproduction or networking permited without icense from IHS Not for Resale ISO15099:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. @ISO2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISO's member body in the country of the requester. ISO copyright office Casepostale 56:CH-1211Geneva20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISo 2003-All rights reserved CyhmlganztoStandardzato No reproduction or networking pemmited without license from IHs Not for Resale ISO 15099:2003(E) Contents Foreword Introduction 1 Scope 2 Normativereferences 3 Symbols 3.1 General. 3.2 Symbols and units 3.3 Subscripts...... 4 Determination oftotal window and door system properties 4.1 Thermal transmittance.... 4.2 Total solar energy transmittance 9 4.3 Visibletransmittance.... 10 5 Vision area properties 5.1 Glazing layer optics 10 5.2 Glazing system optics 11 5.3 Vision area heat transfer .. 13 6 Frame effects.... 20 6.1 Area and lineal thermal transmittance.... 20 6.2 Governing equationsforcalculatingthermaltransmittance.. 20 6.3 Geometric representation and meshing .. 20 6.4 Solid materials..... 23 6.5 EffectiveconductivityGlazingcavities 23 6.6 Effective conductivity Unventilated frame cavities .. 6.7 Ventilated air cavities and grooves.. 30 7 Shading devices....... 31 7.1 Definitions... 31 7.2 Optical properties . 32 7.3 Siat type of shading ... 7.4 Ventilation ..... 39 7.5 Totalsolarenergytransmittanceandthermaltransmittance 50 8 Boundary conditions. 50 8.1 8.2 Referenceboundaryconditions 50 8.3 Convectiveheattransfer... 51 8.4 Longwaveradiationheattransfer 55 8.5 Combined convective and radiative heat transfer..... 8.6 Prescribed density of heat flow rate .... 59 Annex A (informative) Solution technique for the multilayer solar optical model.... Annex B (normative) Thermophysical fill gas property values ... Annex C (informative)Examples of calculatedvaluesfor optical properties of slattype of shading devices .64 Bibliography .. Standardization rights reserved ii nal Organization by IHS unde No reproductin or networking permited without icense frm IHS Not for Resale ISO 15099:2003(E) Foreword (ISO member bodies). The work of preparing International Standards is normally carried out through ISO non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (lEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. rights. IsO shall not be held responsible for identifying any or all such patent rights. built environment. ISO 2003— All rights reserved ional Organization for Standardizatio Not fr es