EN ISO 15758:2014

SLOVENSKI STANDARD
01-september-2014
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SIST EN 14114:2002
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Hygrothermal performance of building equipment and industrial installations - Calculation
of water vapour diffusion - Cold pipe insulation systems (ISO 15758:2014)
Wärmedämmung von haus- und betriebstechnischen Anlagen in Gebäuden -
Berechnung der Wasserdampfdiffusion - Dämmung von Kälteleitungen (ISO
15758:2014)
Performance hygrothermique des équipements de bâtiments et installations industrielles
- Calcul de la diffusion de vapeur d'eau - Systèmes d'isolation de tuyauteries froides (ISO
15758:2014)
Ta slovenski standard je istoveten z: EN ISO 15758:2014
ICS:
91.120.10 Toplotna izolacija stavb Thermal insulation
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 15758
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2014
ICS 91.120.10; 91.140.01 Supersedes EN 14114:2002
English Version
Hygrothermal performance of building equipment and industrial
installations - Calculation of water vapour diffusion - Cold pipe
insulation systems (ISO 15758:2014)
Performance hygrothermique des équipements de Wärmedämmung von haus- und betriebstechnischen
bâtiments et installations industrielles - Calcul de la Anlagen in Gebäuden - Berechnung der
diffusion de vapeur d'eau - Systèmes d'isolation de Wasserdampfdiffusion - Dämmung von Kälteleitungen (ISO
tuyauteries froides (ISO 15758:2014) 15758:2014)
This European Standard was approved by CEN on 20 March 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15758:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 15758:2014) has been prepared by Technical Committee ISO/TC 163 “Thermal
performance and energy use in the built environment” in collaboration with Technical Committee CEN/TC 89
“Thermal performance of buildings and building components” the secretariat of which is held by SIS.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by November 2014, and conflicting national standards shall be withdrawn
at the latest by November 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 14114:2002.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 15758:2014 has been approved by CEN as EN ISO 15758:2014 without any modification.
INTERNATIONAL ISO
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 bâtiments et
installations industrielles — Calcul de la diffusion de vapeur d’eau —
Systèmes d’isolation de tuyauteries froides
Reference number
ISO 15758:2014(E)
©
ISO 2014
ISO 15758:2014(E)
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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Published in Switzerland
ii © ISO 2014 – All rights reserved

ISO 15758:2014(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
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
6.1 General . 6
6.2 Calculation of rate of condensation in single homogenous insulation layer . 6
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
ISO 15758:2014(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 163, Thermal performance and energy use in the
built environment, Subcommittee SC 2, Calculation methods.
This second edition cancels and replaces the first edition (ISO 15758:2004), which has been technically
revised. The main changes are the following:
— in Clause 5, b), the alternative of using annual mean temperature and vapour pressure has been
removed;
— the method of calculation given in 6.3 has been changed such that the total amount of condensation
water in the whole pipe system is calculated based only on the outermost tangent to the saturation
pressure, p ;
sat
— Figure 1 has been modified;
— the example given in A.3 has been changed;
— in Annex B, an explanation of the system with capacity for drying has been added;
— references have been added to the Bibliography.
iv © ISO 2014 – All rights reserved

ISO 15758:2014(E)
Introduction
If the thermal insulation of a cold pipe system is not completely water vapour tight, there will be a flow
of water vapour from the warm environment to the surface of the pipe, whenever the temperature of
the surface of the cold pipe is below the dew point of the ambient air. This flow of water vapour leads
to an interstitial condensation in the insulation layer and/or dew formation on the surface of the pipe
itself. Interstitial condensation may cause the insulation material to deteriorate and dew formation on
the surface of a metal pipe may cause corrosion over time. If the temperature is below 0 °C ice will be
formed and the methods of this standard will not apply.
In period, when the dew point of the ambient air is higher than the temperature of the outer surface of
the insulation, surface condensation will occur. This is dealt with in ISO 12241.
Different measures are available to control water vapour transfer and reduce the amount of condensation.
The following are normally applied:
a) Installation of a vapour retarder;
b) Use of insulation materials with a high water vapour resistance factor (low permeability);
c) Use of a vapour retarder and a capillary active fabric to continuously remove condensed water from
the pipe surface to the environment; see Annex B for an example.
Which protection measure is chosen depends on the ambient climate, the temperature of the medium in
the pipe and the water vapour diffusion resistance of the insulation layer. The success of any system is
strongly dependent on workmanship and maintenance. In any case anti-corrosion measures should be
applied to a metal pipe in severe conditions.
The expected economic lifetime of an insulation system, assuming a max
...