ISO 10456:1997
(Main)Thermal insulation — Building materials and products — Determination of declared and design thermal values
Thermal insulation — Building materials and products — Determination of declared and design thermal values
Isolation thermique — Matériaux et produits du bâtiment — Détermination des valeurs thermiques déclarées et utiles
General Information
Relations
Standards Content (Sample)
INTERNATIONAL IS0
STANDARD 10456
First edition
1997-08-I 5
Thermal insulation - Building materials
and products - Determination of declared
and design thermal values
/so/a tion thermique - Ma t&iaux et produits du bg timen t - D6 termina tion
des valeurs thermiques d&lakes et utiles
Reference number
IS0 10456: 1997(E)
---------------------- Page: 1 ----------------------
IS0 10456: 1997(E)
Page
Contents
1
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.
1
2 Normative references . . . . . . . . .*.
1
3 Definitions, symbols and units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.
2
4 Test methods and test conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
5 Determination of declared values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.
4
6 Determination of design values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
7 Conversion of available data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Annexes
6
A Conversion coefficients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
B Sample calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
C Statistical calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16
D Bibliography . . . . . . . . . . . . . . . . . . . . .*.
0 IS0 1997
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 l CH-1211 Geneve 20 l Switzerland
lnternet: central @ iso.ch
X.400: c=ch; a=4OOnet; p=iso; o=isocs; s=central
Printed in Switzerland
ii
---------------------- Page: 2 ----------------------
ISO10456:1997(E)
@ IS0
Foreword
IS0 (the International Organization for Standardization) is a world-wide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through
IS0 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. IS0 collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical
standardization.
Draft International Standards adopted by 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 IS0 10456 was prepared by Technical Committee
ISO/TC 163, Thermal insulation, Subcommittee SC 2, C&u/&ion
methods.
Annex A forms an integral part of this International Standard.
Annexes B, C and D are for information only.
. . .
III
---------------------- Page: 3 ----------------------
This page intentionally left blank
---------------------- Page: 4 ----------------------
IS0 10456:1997(E)
INTERNATIONAL STANDARD @ IS0
Building materials and products -
Thermal insulation -
Determination of declared and design thermal values
1
Scope
This Internatonal 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 and moisture, valid for mean temperatures between 0 “C and
30 “C, are given in annex A.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute
provisions of this International Standard. At the time of publication, the editions indicated were valid.
All standards are subject to revision, and parties to agreements based on this International Standard
are encouraged to investigate the possibility of applying the most recent editions of the standards
indicated below. Members of IEC and IS0 maintain registers of currently valid International
Standards.
IS0 8301:1991, Thermal insulation - Determination of steady-state thermal resistance and related
properties - Heat flow meter apparatus.
IS0 8302:1991, Thermal insulation - Determination of steady-state thermal resistance and related
properties - Guarded hot plate apparatus.
IS0 8990:1994, Thermal insulation - Determination of steady-state thermal transmission properties
-Calibrated and guarded hot box.
Definitions, symbols and units
3
Definitions
31 .
For the purposes of this International Standard, the following definitions apply.
3.1.1 declared thermal value: Expected value of a thermal property of a building material or product
- assessed from measured data converted to reference conditions of temperature and humidity;
- given for a stated fraction and confidence level;
- corresponding to a reasonable expected service life time under normal conditions.
---------------------- Page: 5 ----------------------
ISO10456:1997(E) @ IS0
3.1.2 design thermal value: Value of a 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
I
I
F ageing conversion factor
a
I I
F moisture conversion factor
m
I I
F temperature conversion factor
T
I
f temperature conversion coefficient
1/K
T
I
I
f
moisture conversion coefficient mass by mass
u kg/kg
m3/m3
f moisture conversion coefficient volume by volume
w
R thermal resistance
m2.K/W
I
I
T temperature K
I
I
h thermal conductivity
W/h-K)
u
moisture content mass by mass b/b
m3/m3
moisture content volume by volume
w
Test methods and test conditions
Measured values from the following methods, or equivalent national methods, shall be used:
- guarded hot plate in accordance with IS0 8302;
- heat flow meter in accordance with IS0 8301;
- hot box in accordance with IS0 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 application of the temperature coefficients does
not introduce a change of more than 2 % from the measured value.
The following test conditions are required:
- measured thickness and density for identification;
- mean test temperature;
- moisture content of the specimen during test;
and for aged materials:
- age of the specimen and conditioning procedures before testing.
2
---------------------- Page: 6 ----------------------
ISO10456:1997( E)
@ IS0
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)
a b a b
23 “C
IOOC 10°C 23 “C
Reference temperature
U
u u u
Moisture
23,50 23,50
dry
dw
aged
aged aged aged
Ageing
u,, is a low moisture content reached by drying.
U 2350 is the moisture content when in equilibrium with air at 23 “C and relative humidity of
50’0/ 0.
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 can 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:
- for thermal conductivity given in watt per metre kelvin [W/(m*K)]:
h s 0,08: rounding to nearest higher 0,001 W/(m*K)
0,08 < h s 0,20: rounding to nearest higher 0,005 W/(m*K)
0,20 < h s 2,00: rounding to nearest higher 0,Ol W/(m*K)
2,0 < h rounding to nearest higher 0,l W/(m.K)
and/or:
- for thermal resistance given in square metre kelvin per watt (m’X/W) as the nearest lower
value rounded to not more than two decimals or three significant figures.
---------------------- Page: 7 ----------------------
IS0 10456: 1997(E) @ IS0
6
Determination of design values
Design measured values or standardized tabulated
values can be obtained from a declared value,
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 the rules given in clause 5:
- for thermal conductivity as the nearest higher value in watt per metre kelvin [W/(m*K)];
- for thermal resistance as the nearest lower value in square metre kelvin per watt (m’K/W).
6.1 Design values derived from declared values
from
When the desi gn value is cal culated the declared value a nd is based on the same statistical
evaluation value shall be conv et-ted to the design co nditions.
, the declared
Information on how to derive design values
base d on a stati stica I evaluation other than the one
applicable to the declared value is given in ann ex C.
62 . 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.
63 . Design values derived from tabulated values
Standardized tabulated values can be used when the set of conditions for them are available.
7 Conversion of available data
Conversion coefficients derived from measured values according to the test methods referred to in
clause 4 can be used instead of the values given in annex A.
Conversions of therm ns (h,, R,) to another set of conditions (h,, R,)
al values from one set of conditio
are carried o
ut accord ing to the following expressions:
~,=A,+F,~F,
. . . .
(1)
4
. . . .
(2)
R2 = b l Fm. F,
4
---------------------- Page: 8 ----------------------
@ IS0 IS0 10456:1997(E)
7.1 Conversion for temperature
The factor F,for temperature is determined by:
-
- &(7-2-T,)
. . . .
(3)
b
fT is the temperature conversion coefficient;
TY, is the temperature of the first set of conditions;
T, is the temperature of the second set of conditions.
7.2 Conversion for moisture
The factor F, for moisture content is determined as follows.
a) Conversion of moisture content given as mass by mass:
m = &krW
F . . . .
(4)
fu is the moisture content conversion coefficient mass by mass;
u, is the moisture content mass by mass of the first set of conditions;
u, is the moisture content mass by mass of the second set of conditions.
b) Conversion of moisture content given as volume by volume:
= efyy,(-Yl)
F . . . .
(5)
m
fv is the moisture content conversion coefficient volume by volume;
v, is the moisture content volume by volume of the first set of conditions;
v2 is the moisture content volume by volume of the second set of conditions.
7.3 Age conversion
The ageing depends upon the material type, facings, structures, the blowing agent, the temperature
and the thickness of the material. For a
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.