ISO INTERNATIONAL STANDARD 15758 Second edition 2014-05-01 Hygrothermal performance of building equipment and industrial installations Calculation of water vapour diffusion Cold pipe insulation systems Performance hygrothermique des équipements de batiments et installations industrielles Calcul de la diffusion de vapeur d'eau Systemes d'isolation detuyauteries froides Reference number ISO 15758:2014(E) LSO @ IS0 2014 I without license from IHS Not for Resale IS0 15758:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2014 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. 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 @ IS0 2014 - All rights reserved No reproductic networking permitted without license from IHS Not for Resale IS0 15758:2014(E) Contents Page Foreword ..iv Introduction ..V 1 Scope. ..1 2 Normative references ..1 3 Terms, definitions and symbols 4 Calculation formulae .3 4.1 General. .3 4.2 Homogeneous insulation .3 4.3 Multi-layer insulation systems 4 4.4 Systems with capacity for drying 4 5 Boundary conditions .5 6 Calculation procedure 6.1 General .6 6.2 Calculation of rate of condensation in single homogenous insulation layer 6.3 Calculation of rate of condensation in multi-layer insulation system. .6 Annex A (informative) Examples 9 Annex B (informative) System with capacity for drying and experimental determination of evaporation rate from surface of wet wick fabric 11 Bibliography .15 iii Stal se with IS ut license from IHS Not for Resale