EN ISO 10456:1999
(Main)Building materials and products - Procedures for determining declared and design thermal values (ISO 10456:1999)
Building materials and products - Procedures for determining declared and design thermal values (ISO 10456:1999)
This document specifies the procedures for determining the declared and design thermal values of building products. It is a Bh-type horizontal standard in support of the standardization of building products as performed by the product related CEN/TCs.
Baustoffe und -produkte - Verfahren zur Bestimmung der wärmeschutztechnischen Nenn- und Bemessungswerte (ISO 10456:1999)
Diese Internationale Norm legt Verfahren zur Bestimmung der wärmeschutztechnischen Nenn- und Bemessungswerte von wärmetechnisch homogenen Baustoffen und -produkten fest. Sie gibt Verfahren zur Umrechnung von Werten, die unter den Bedinungen eines Datensatzes erhalten wurden, in die eines anderen an. Diese Verfahren gelten bei der Planung für Umgebunstemperaturen zwischen -30°C und + 60°C.
Matériaux et produits du bâtiment - Procédures pour la détermination des valeurs thermiques déclarées et utiles (ISO 10456:1999)
Gradbeni materiali in proizvodi - Postopki za določevanje nazivnih in računskih vrednosti toplotnih vrednosti (ISO 10456:1999)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 10456:2001
01-september-2001
*UDGEHQLPDWHULDOLLQSURL]YRGL3RVWRSNL]DGRORþHYDQMHQD]LYQLKLQUDþXQVNLK
YUHGQRVWLWRSORWQLKYUHGQRVWL ,62
Building materials and products - Procedures for determining declared and design
thermal values (ISO 10456:1999)
Baustoffe und -produkte - Verfahren zur Bestimmung der wärmeschutztechnischen Nenn
- und Bemessungswerte (ISO 10456:1999)
Matériaux et produits du bâtiment - Procédures pour la détermination des valeurs
thermiques déclarées et utiles (ISO 10456:1999)
Ta slovenski standard je istoveten z: EN ISO 10456:1999
ICS:
91.100.01
91.120.10
SIST EN ISO 10456:2001 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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INTERNATIONAL ISO
STANDARD 10456
Second edition
1999-12-01
Building materials and products —
Procedures for determining declared and
design thermal values
Matériaux et produits du bâtiment — Procédures pour la détermination des
valeurs thermiques déclarées et utiles
A
Reference number
ISO 10456:1999(E)
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ISO 10456:1999(E)
Contents
1 Scope .1
2 Normative references .1
3 Terms, definitions and symbols.1
3.1 Definitions .1
3.2 Symbols and units.2
4 Test methods and test conditions .2
5 Determination of declared values .3
6 Determination of design values .4
6.1 Design values derived from declared values.4
6.2 Design values derived from measured values.4
6.3 Design values derived from tabulated values.4
7 Conversion of available data .4
7.1 General.4
7.2 Conversion for temperature .5
7.3 Conversion for moisture .5
7.4 Age conversion.5
(normative)
Annex A Conversion coefficients .6
Annex B (informative) Sample calculations.12
Annex C (informative) Statistical calculations .15
Bibliography.16
© ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
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© ISO
ISO 10456:1999(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 3.
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.
International Standard ISO 10456 was prepared by Technical Committee ISO/TC 163, Thermal insulation, Subcom-
mittee SC 2, Calculation methods.
This second edition cancels and replaces the first edition (ISO 10456:1997), of which it constitutes a minor revision.
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INTERNATIONAL STANDARD © ISO ISO 10456:1999(E)
Building materials and products — Procedures for
determining declared and design thermal values
1 Scope
This International Standard specifies methods for the determination of declared and design thermal values for
thermally homogeneous building materials and products.
It also gives procedures to convert values obtained under one set of conditions to those valid for another set of
conditions. These procedures are valid for design ambient temperatures between –30 °C and +60 °C.
Conversion coefficients for temperature, valid for mean temperatures between 0 °C and 30 °C, and moisture are
given in annex A.
This International Standard does not give any conversion coefficients for the effect of ageing or other effects like
convection or settlement.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 8301:1991, Thermal insulation — Determination of steady-state specific thermal resistance and related
properties — Heat flow meter apparatus.
ISO 8302:1991, Thermal insulation — Determination of steady-state thermal resistance and related properties —
Guarded hot plate apparatus.
ISO 8990:1994, Thermal insulation — Determination of steady-state thermal transmission properties — Calibrated
and guarded hot box.
3 Terms, definitions and symbols
3.1 Definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1.1
declared thermal value
expected value of a thermal property of a building material or product
assessed from measured data at reference conditions of temperature and humidity;
given for a stated fraction and confidence level;
corresponding to a reasonable expected service lifetime under normal conditions
1
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© ISO
ISO 10456:1999(E)
3.1.2
design thermal value
value of thermal property of a building material or product under specific external and internal conditions which can
be considered as typical of the performance of that material or product when incorporated in a building component
3.1.3
material
piece of a product irrespective of its delivery form, shape and dimensions, without any facing or coating
3.1.4
product
final form of a material ready for use, of given shape and dimensions and including any facings or coatings
3.2 Symbols and units
Table 1 — Symbols, quantities and units
Symbol Quantity Unit
F ageing conversion factor
a
F moisture conversion factor
m
F temperature conversion factor
T
f temperature conversion coefficient 1/K
T
f moisture conversion coefficient mass by mass kg/kg
u
3 3
f moisture conversion coefficient volume by volume
m /m
y
2
R thermal resistance
m × K/W
T temperature K
l thermal conductivity W/(m × K)
u moisture content mass by mass kg/kg
3 3
y
moisture content volume by volume m /m
4 Test methods and test conditions
Measured values from the following methods, or equivalent national methods, shall be used:
guarded hot plate in accordance with ISO 8302;
heat flow meter in accordance with ISO 8301;
hot box in accordance with ISO 8990.
To avoid conversions, it is recommended that measurements be conducted under conditions corresponding to the
selected set of conditions given in Table 2.
The mean test temperature should be chosen so that the application of the temperature coefficients does not
introduce a change of more than 2 % from the measured value.
The following testing conditions are required:
measured thickness and density for identification;
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© ISO
ISO 10456:1999(E)
mean test temperature;
moisture content of the specimen during test.
For aged materials:
age of the specimen and conditioning procedures before testing.
5 Determination of declared values
The declared value shall be given under one of the sets of conditions a or b with reference temperature 10 °C (I) or
23 °C (II) in Table 2.
Table 2 — Declared value conditions
Sets of conditions
Property I (10 °C) II (23 °C)
ab a b
Reference temperature 10 °C 10 °C 23 °C 23 °C
Moisture u u u u
dry 23,50 dry 23,50
Ageing aged aged aged aged
u is a low moisture content reached by drying.
dry
o
u is the moisture content when in equilibrium with air at 23 C and relative humidity of 50 %.
23,50
The declared value shall be determined either at a thickness large enough to neglect the thickness effect, or the
declared values for smaller thicknesses shall be based on measurements at those thicknesses.
The data used shall be either
directly measured values according to the test methods given in clause 4, or
obtained indirectly by making use of an established correlation with a related property such as density.
When all data have not been measured under the same set of conditions, they shall first be brought to one set of
conditions (see clause 7). Then a statistical single value estimate shall be calculated. Annex C refers to
International Standards on statistics that may be used.
During calculations no value shall be rounded to less than three significant figures.
The declared value is the estimated value of the statistical single value, rounded according to the following rules:
a) for thermal conductivity given in watts per metre kelvin [W/(m × K)]:
l < 0,08: rounding to nearest higher 0,001 W/(m × K)
0,08 < l < 0,20: rounding to nearest higher 0,005 W/(m × K)
0,20 < l < 2,00: rounding to nearest higher 0,01 W/(m × K)
2,0 < lrounding to nearest higher 0,1 W/(m × K)
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© ISO
ISO 10456:1999(E)
and/or:
2
b) for thermal resistance given in square metres kelvin per watt (m × K/W) as the nearest lower value rounded to
not more than two decimals or three significant figures.
6 Determination of design values
6.1 General
Design values can be obtained from a declared value, measured values or standardized tabulated values.
Measured data can be either
directly measured values according to the test methods given in clause 4, or
obtained indirectly by making use of an established correlation with a related property such as density.
If the set of conditions for declared, measured or standardized tabulated values can be considered relevant for the
actual application, those values can be used directly as design values. Otherwise, conversion of data shall be
undertaken according to the procedure given in clause 7.
The design value shall be rounded according to the rules given in clause 5:
for thermal conductivity, as the nearest higher value in watts per metre kelvin [W/(m × K)];
2
for thermal resistance, as the nearest lower value in square metres kelvin per watt (m × K/W).
6.2 Design values derived from declared values
When the design value is calculated from the declared value and is based on the same statistical evaluation, the
declared value shall be converted to the design conditions.
Information on how to derive design values based on another statistical evaluation other than the one applicable to
the declared value is given in annex C.
6.3 Design values derived from measured values
When necessary all data shall first be converted to the design conditions. Then a statistical single value estimate
shall be calculated. Annex C refers to International Standards on statistics that can be used.
6.4 Design values derived from tabulated values
Standardized tabulated values can be used when the set of conditions for them is available.
7 Conversion of available data
7.1 General
Conversion coefficients derived from measured values according to the test methods referred to in clause 4 may be
used instead of the values in annex A.
Conversions of thermal values from one set of conditions (l, R ) to another set of conditions (l, R ) are carried
1 1 2 2
out according to the following expressions:
ll=×FF× ×F (1)
21 T ma
4
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© ISO
ISO 10456:1999(E)
R
1
R = (2)
2
FF××F
T ma
7.2 Conversion for temperature
The factor F for temperature is determi
...
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