EN ISO 23993:2010

SLOVENSKI STANDARD
01-marec-2011
Nadomešča:
SIST EN ISO 23993:2008
Toplotnoizolacijski proizvodi za opremo stavb in industrijske inštalacije -
Določevanje projektne toplotne prevodnosti (ISO 23993:2008, popravljena različica
2009-10-01)
Thermal insulation products for building equipment and industrial installations -
Determination of design thermal conductivity (ISO 23993:2008, Corrected version 2009-
10-01)
Wärmedämmung an betriebstechnischen Anlagen in der Industrie und der technischen
Gebäudeausrüstung - Bestimmung der Betriebswärmeleitfähigkeit (ISO 23993:2008,
korrigierte Fassung 2009-10-01)
Produits isolants thermiques pour l'équipement du bâtiment et les installations
industrielles - Détermination de la conductivité thermique utile (ISO 23993:2008, Version
corrigée 2009-10-01)
Ta slovenski standard je istoveten z: EN ISO 23993:2010
ICS:
27.220 Rekuperacija toplote. Heat recovery. Thermal
Toplotna izolacija insulation
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 23993
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2010
ICS 27.220; 91.120.10; 91.100.60 Supersedes EN ISO 23993:2008
English Version
Thermal insulation products for building equipment and industrial
installations - Determination of design thermal conductivity (ISO
23993:2008, Corrected version 2009-10-01)
Produits isolants thermiques pour l'équipement du bâtiment Wärmedämmung an betriebstechnischen Anlagen in der
et les installations industrielles - Détermination de la Industrie und der technischen Gebäudeausrüstung -
conductivité thermique utile (ISO 23993:2008, Version Bestimmung der Betriebswärmeleitfähigkeit (ISO
corrigée 2009-10-01) 23993:2008, korrigierte Fassung 2009-10-01)
This European Standard was approved by CEN on 11 October 2010.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23993:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
The text of ISO 23993:2008, Corrected version 2009-10-01 has been prepared by Technical Committee
ISO/TC 163 “Thermal performance and energy use in the built environment” of the International Organization
for Standardization (ISO) and has been taken over as EN ISO 23993:2010 by 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 May 2011, and conflicting national standards shall be withdrawn at the
latest by May 2011.
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 ISO 23993:2008.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 23993:2008, Corrected version 2009-10-01 has been approved by CEN as a EN ISO
23993:2010 without any modification.

INTERNATIONAL ISO
STANDARD 23993
First edition
2008-02-01
Corrected version
2009-10-01
Thermal insulation products for building
equipment and industrial installations —
Determination of design thermal
conductivity
Produits isolants thermiques pour l'équipement du bâtiment et les
installations industrielles — Détermination de la conductivité thermique
utile
Reference number
ISO 23993:2008(E)
©
ISO 2008
ISO 23993:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 23993:2008(E)
Contents Page
Foreword. iv
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Symbols . 2
5 Determination of declared thermal conductivity . 2
6 Determination of the design value of thermal conductivity . 3
7 Conversion of available data . 3
7.1 General. 3
7.2 Conversion factor for temperature difference . 4
7.3 Conversion factor for moisture . 4
7.4 Conversion factor for ageing. 5
7.5 Conversion factor for compression. 5
7.6 Conversion factor for convection . 5
7.7 Conversion factor for thickness effect. 5
7.8 Conversion factor for regular joints . 5
7.9 Additional thermal conductivity for regularly insulation-related thermal bridges,
e.g. spacers . 6
Annex A (normative) Conversion factors . 8
Annex B (informative) Examples of determination of the design thermal conductivity. 20
Annex C (informative) Approximate values of conversion factors . 23
Bibliography . 31

ISO 23993:2008(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 23993 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 89, Thermal performance of buildings and building components, in collaboration with ISO Technical
Committee ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 2,
Calculation methods, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
This International Standard is one of a series of standards on methods for the design and evaluation of the
thermal performance of building equipment and industrial installations.
This corrected version of ISO 23993:2008 incorporates the following corrections plus other minor editorial
modifications.
Clause 4: The following two rows have been added to the table:
N number of spacers per square metre —

.
∆λ thermal conductivity per spacer per square metre W/(m K)
sq
Clause 6: Equations (1) and (2) have been re-inserted:
λ=+λλF∆ (1)
d
F =F F F F FFF (2)
ma c
∆θ C dj
7.9.2.2: The calculations have been modified as follows (i.e. with the substitution of ∆λ , the thermal
sq
conductivity per spacer per square metre, for ∆λ i.e., with the deletion of “/spacers/m ” from the units):
Spacers of steel in the form of a flat bar
30 mm × 3 mm ∆λ = 0,003 5 W/(m·K)
sq
40 mm × 4 mm ∆λ = 0,006 0 W/(m·K)
sq
50 mm × 5 mm ∆λ = 0,008 5 W/(m·K)
sq
iv © ISO 2008 – All rights reserved

ISO 23993:2008(E)
A new Equation (6) has been added to define the relationship between ∆λ and ∆λ and the original
sq
Equation (6) renumbered to Equation (7).
7.9.3: The units “W(m·K)” have been corrected to “W/(m·K)”.
A.4.1 (twice) and A.4.2 (twice): The term “specific” has been added to the definition of W, “specific airflow
resistance.”
Annex B: The additional subtitles and introductory text, “B.1 Insulation materials” and “B.2 Conditions” have
been added. The line “Determination of the conversion factors and ∆λ” has been restyled as B.3 and
introductory text added.
Table C.1: The vertical line separating the subheadings “calcium-magnesium silicate fibre” and “calcium
silicate” and “microporous insulants” each from the subheading “Insulation” has been moved one column to
the left, i.e. from between the pictures for the two pipes to between the column “Application.” and the picture
of the horizontal pipe (consistent with other similar rows such as that for “
...