ISO INTERNATIONAL STANDARD 9920 Second edition 2007-06-01 Ergonomics of the thermal environment Estimation of thermal insulation and water vapour resistance of a clothing ensemble Ergonomie des ambiances thermiques - Determination de I'isolement thermique et de la résistance a I'évaporation d'une tenue vestimentaire Reference number ISO 9920:2007(E) @ ISO 2007 py IHS under ted without license from IHS Not for Resale ISO 9920:2007(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 COPYRIGHTPROTECTED DOCUMENT @ISO2007 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 Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISo 2007 - All rights reserved I without license from IHS Not for Resale ISO 9920:2007(E) Contents Page Foreword. Introduction .vi 1 Scope 2 Terms and definitions.... 3 Application of this International Standard .. 4 Estimation of thermal insulation of clothing ensemble based on tables and with values measured ona standingthermal manikin.... 4.1 General...... 4.2 Insulationvaluesofcompleteensembles.. 8 4.3 Ensemble thermal insulation values based on individual garments ... 8 4.4 Complete ensemble insulation corrected for small differences in composition ... 4.5 Calculation of thermal insulation for clothing ensembles .... 4.6 Calculation of thermal insulationforindividual garments... 9 5 Estimation of clothing area factor..... 6 Estimation of surface (or boundary) air layer insulation... Estimation of water vapour resistance..... 12 7.1 General.... 12 7.2 Estimation of vapour resistance of clothing ensembles based on tables with values 7.3 Estimationofvapourresistanceofclothingensemblebasedonitsrelationwithdryheat resistance... .12 8 Influence of body movement and air movement on the thermal insulation and vapour resistance of a clothing ensemble .. 13 8.1 13 8.2 Correction of clothing insulation .. 13 8.3 Correction of clothing vapour resistance ... 18 8.4 20 8.5 Relative air velocity ... 20 9 Other factors influencing clothing insulation . 22 9.1 General. 22 9.2 Posture. 22 9.3 22 9.4 Effect of pressure . 22 9.5 Wetting... 22 9.6 Washing... 22 Annex A (normative) Thermal insulation values for clothing ensembles .... .23 Annex B (normative) Thermal insulation values for individual garments.. 45 Annex C (normative) Vapour permeability index values for clothing ensembles... Annex D (informative) Measurement of thermal insulation and water vapour resistance of clothing ensembles on a thermal manikin ..... Annex E (informative) Measurement of thermal insulation and water vapour resistance of a clothing ensemble on human subjects .. ...93 Annex F (informative) Different expressions for the thermal insulation of clothing... ...95 Annex G (informative) Estimation of the heat exchanges for reflective clothing... 97 CopyrghtIntemational Organzationsandardizllinghtsreserved ili ted without license from IHS Not for Resale ISO 9920:2007(E) Anne