SIST EN 17667:2022
(Main)Test method - Determination of thermal resistance of filled textile articles and similar items using small guarded hotplate apparatus
Test method - Determination of thermal resistance of filled textile articles and similar items using small guarded hotplate apparatus
This method of test described a means of determining the thermal resistance of textile assemblies with a non-uniform thickness and child sleep bags and cot duvets. The test method is suitable for products with a thermal resistance within the range 0.25 tog (0.025 m².K/W) to 5.0 tog (0.5 m².K/W).
Prüfverfahren - Bestimmung des Wärmedurchgangswiderstands von gefüllten textilen Artikeln und ähnlichen Gegenständen unter Verwendung einer kleinen Guarded-Hotplate-Vorrichtung
Dieses Prüfverfahren legt ein Prüfverfahren zur Bestimmung des Wärmedurchgangswiderstands von textilen Artikeln fest, die gefüllt sein dürfen, z. B. wattierte Mäntel und Jacken, Kinderschlafsäcke, Kinderbettdecken usw., oder von textilen Artikeln mit einem Wärmedurchgangswiderstand von bis zu 0,5 m2K/W (5,0 tog) und/oder die keine einheitliche Dicke aufweisen.
Das Prüfverfahren ist für Produkte mit einem Wärmedurchgangswiderstand im Bereich von 0,025 m2K/W (0,25 tog) bis etwa 0,5 m2K/W (5,0 tog) anwendbar, wird aber nur durch die Fähigkeit der Prüfeinrichtung begrenzt, mit der Dicke der Messprobe zurechtzukommen.
Méthode d’essai - Détermination de la résistance thermique d’articles textiles garnis et de produits similaires au moyen d’un appareillage à petite plaque chaude gardée
Le présent document spécifie une méthode d’essai pour la détermination de la résistance thermique d’articles textiles éventuellement garnis (par exemple, des manteaux et des vestes rembourrés, des gigoteuses, des couettes pour lit à nacelle, etc.) ou d’articles textiles dont la résistance thermique atteint jusqu’à 0,5 m2K/W (5,0 tog) et/ou qui ne présentent pas une épaisseur uniforme.
Cette méthode d’essai est applicable aux produits dont la résistance thermique est comprise entre 0,025 m2K/W (0,25 tog) et environ 0,5 m2K/W (5,0 tog), mais n’est limitée que par la capacité de l’appareillage d’essai à contenir l’épaisseur de l’échantillon pour essai.
Preskusna metoda - Določanje toplotne odpornosti polnjenih tekstilnih izdelkov in podobnih izdelkov z uporabo majhnih varovalnih aparatov
Ta preskusna metoda opisuje način določanja toplotne upornosti tekstilnih sklopov z neenakomerno debelino ter otroških spalnih vreč in odej za otroške postelje. Preskusna metoda je primerna za izdelke s toplotno upornostjo v območju 0,25 tog (0,025 m²∙K/W) do 5,0 tog (0,5 m²∙K/W).
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 17667:2022
01-september-2022
Preskusna metoda - Določanje toplotne odpornosti polnjenih tekstilnih izdelkov in
podobnih izdelkov z uporabo majhnih varovalnih aparatov
Test method - Determination of thermal resistance of filled textile articles and similar
items using small guarded hotplate apparatus
Prüfverfahren - Bestimmung des Wärmedurchgangswiderstands von gefüllten textilen
Artikeln und ähnlichen Gegenständen unter Verwendung einer kleinen Guarded-
Hotplate-Vorrichtung
Méthode d’essai - Détermination de la résistance thermique d’articles textiles garnis et
de produits similaires au moyen d’un appareillage à petite plaque chaude gardée
Ta slovenski standard je istoveten z: EN 17667:2022
ICS:
97.160 Tekstilije za dom. Perilo Home textiles. Linen
97.190 Otroška oprema Equipment for children
97.200.30 Oprema za taborjenje in Camping equipment and
tabori camp-sites
SIST EN 17667:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 17667:2022
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SIST EN 17667:2022
EN 17667
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 97.160; 97.190; 97.200.30
English Version
Test method - Determination of thermal resistance of filled
textile articles and similar items using small guarded
hotplate apparatus
Méthode d'essai - Détermination de la résistance Prüfverfahren - Bestimmung des
thermique d'articles textiles garnis et de produits Wärmedurchgangswiderstands von gefüllten textilen
similaires au moyen d'un appareillage à petite plaque Artikeln und ähnlichen Gegenständen unter
chaude gardée Verwendung einer kleinen Guarded-Hotplate-
Vorrichtung
This European Standard was approved by CEN on 27 April 2022.
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, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17667:2022 E
worldwide for CEN national Members.
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SIST EN 17667:2022
EN 17667:2022 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Apparatus . 6
6 Conditioning . 9
7 Test samples . 9
8 Test procedure . 9
9 Test report .12
10 Accuracy and precision .12
Annex A (informative) Alternative method of determination of thermal resistance of air layer
.13
A.1 Determination of thermal resistance of air layer .13
Annex B (informative) Guidance on labelling of thermal resistance .14
B.1 Guidance on labelling of thermal resistance .14
Bibliography .15
2
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SIST EN 17667:2022
EN 17667:2022 (E)
European foreword
This document (EN 17667:2022) has been prepared by Technical Committee CEN/TC 248 “Textiles and
textile products”, the secretariat of which is held by BSI.
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 December 2022, and conflicting national standards shall
be withdrawn at the latest by December 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
3
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SIST EN 17667:2022
EN 17667:2022 (E)
Introduction
This test method has been developed to provide a simple method of determining the thermal resistance
of filled textile products and similar articles using a small guarded hotplate apparatus. Other methods
such as ISO 5085-1 and EN ISO 11092 may have limitations on the range of their measurement capability
and/or require the use of complex apparatus. The apparatus used in this method is broadly comparable
with that specified in ISO 5085-1 but with a number of differences which are intended to provide a more
reliable test result. It is based on a test method British Standard BS 8510:2009, which has proven
successful in the United Kingdom over a period of more than 10 years.
This test method measures thermal resistance in a similar manner to EN ISO 11092 when using R mode
ct
but is a simplified version of the test method. Limited trials in the development of this test method
indicate that it has a good correlation with other test methods in use including ISO 5085-1 in single plate
mode and EN ISO 11092.
4
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SIST EN 17667:2022
EN 17667:2022 (E)
1 Scope
This method of test specifies a test method for determining the thermal resistance of textile articles which
may be filled, e.g. padded coats and jackets, child sleep bags, cot duvets, etc., or textiles articles with a
2
thermal resistance of up to 0,5 m K/W (5,0 tog) and/or which do not have uniform thickness.
2
The test method is applicable to products with a thermal resistance within the range 0,025 m K/W (0,25
2
tog) to approximately 0,5 m K/W (5,0 tog) but is limited only by the ability of the test apparatus to cope
with the thickness of the test sample.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 139, Textiles - Standard atmospheres for conditioning and testing (ISO 139)
ISO 8302, Thermal insulation — Determination of steady-state thermal resistance and related properties —
Guarded hot plate apparatus
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
textile article
any textile product formed of a single layer of textile or multiple layers of textile material, with or without
a filling material (textile or non-textile) present
3.2
children’s sleep bag
bedding item consisting of a full length fabric bag, which may be lined or filled, with a neck opening and
armholes, designed to contain a child which may be used in conjunction with nightwear
[SOURCE: EN 16781:2018, 3.1]
3.3
cot duvet
bedding item intended to cover the child’s body, consisting of a filling material permanently sewn into a
textile over intended to be used with or without a secondary removable textile cover
[SOURCE: EN 16779-1:2018, 3.1, modified – Note 1 to entry has been deleted.]
5
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SIST EN 17667:2022
EN 17667:2022 (E)
3.4
thermal resistance
R
R
ct
ratio of the temperature difference between the two faces of a test sample to the rate of flow of heat per
unit area normal to the faces
Note 1 to entry: The thermal resistance may also be known as its ‘tog’ value.
[SOURCE: ISO 5085-1:1989, 3.1, modified – Note 1 to entry has been added.]
3.5
tog value
ten times the temperature difference between the two faces of a sample (in K) when the heat flow across
2
the unit area is equal to 1 W/m
2
Note 1 to entry: 1 tog = 0,1 m K/W.
3.6
indoor ambient condition
for the purpose of this test method, the standard atmosphere as specified in EN ISO 139
4 Principle
The textile article to be tested is placed on a horizontal heated plate at 306 K (skin surface temperature)
and the opposite face is exposed to an ambient room temperature. The power required to maintain
thermal equilibrium (“steady state”) over a period of not less than 60 min is measured and the thermal
resistance of the item is determined.
5 Apparatus
5.1 General
The apparatus shall be built and operated in accordance with the principles of ISO 8302. See Figure 1.
5.2 Thermal resistance tester
The apparatus for the determination of thermal resistance shall be designed so that it complies with the
following:
a) the apparatus shall be horizontal, with the heat flow upwards and designed so that measurements
are made between the upper hot face and the ambient air above the test sample;
b) the surface of the upper hot face of the apparatus shall be flat, isothermal, metal and have a finish
such that the emissivity is not less than 0,9. The central measuring area shall be not less than 200 mm
by 200 mm but not greater than 350 mm by 350 mm. The guard area or effective guard area around
the central measuring area shall be at least 50 mm wide;
NOTE A matt black finish has been found to be suitable.
c) there shall be a suitable means for measuring the temperature of the upper surface of the hot face
and of the air temperature of the air layer above the test sample to an accuracy of 0,2 K;
6
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SIST EN 17667:2022
EN 17667:2022 (E)
d) sets of at least five temperature sensors, each set uniformly distributed over the central measuring
area, shall be used to measure the upper hot face and lower hot face temperatures;
e) a set of at least five shielded temperature sensors uniformly distributed over the central measuring
area shall be used to measure the temperature of the air layer above the test sample. These shall be
located directly above the corresponding sensors in the central measuring area; (see Annex A for
more information);
f) the upper hot face temperature and the temperature of the air layer above the test sample shall be
capable of being controlled to ± 2,0 K;
g) the apparatus shall be located within a test environment maintained in accordance with the standard
temperate atmosphere as specified in EN ISO 139. The apparatus shall be screened from external
sources of heat (e.g. effects of lighting, other apparatus, etc.), and from draughts (e.g. caused by
movement of personnel or opening of nearby doors, etc.);
h) the apparatus shall be equipped with suitable instrumentation for the recording of the individual
temperatures of the upper hot face, lower hot face and air layer above the test sample and energy
required. The instrumentation shall be able to record at least 3 readings per minute;
i) the thermal resistance of the test sample plus the air layer (R ) is determined from the energy
t
dissipated in the central heater, the area of the central heater and the temperature difference T . The
1
temperature difference T is maintained at zero.
2
7
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SIST EN 17667:2022
EN 17667:2022 (E)
Key
1 temperature
2 temperature difference
3 insulation
4 central measuring area
5 central heaters
6 guard heaters
7 guard area
t temperature of the air layer above the quilt
0
t the upper hot face temperature
1
t the lower hot face temperature
2
T the difference between the upper hot face temperature and the temperature of the air layer above the test
1
sample
T the difference between the lower hot face temperature and the upper hot face temperature
2
x denotes temperature sensors
Figure 1 — Apparatus for the determination of thermal resistance of test sample
5.3 Support frames
Support frame(s) of dimensions so as to ensure the intimate contact of the under-surface of the sample
with the hotplate and support any part(s) of the test sample which is greater than the area of the
measuring place (including any guard area).
NOTE The materials used for the support frame and its dimensions are not important provided that it is of
sufficient size and rigidity to support those parts of the test specimen that are not on the hotplate and ensure good
thermal contact between the area of the test specimen and the hotplate.
5.4 Conditioning racks
Racks of dimensions such that it is possible to place the sample to be tested horizontally
...
SLOVENSKI STANDARD
oSIST prEN 17667:2021
01-junij-2021
Preskusna metoda - Določanje toplotne odpornosti polnjenih tekstilnih izdelkov in
podobnih izdelkov z uporabo majhnih varovalnih aparatov
Test method - Determination of thermal resistance of filled textile articles and similar
items using small guarded hotplate apparatus
Prüfverfahren zur Bestimmung des Wärmedurchgangswiderstands von
Kinderschlafsäcken, -bettdecken und -daunendecken mittels einer kleinen geschützten
Wärmeplatte
Ta slovenski standard je istoveten z: prEN 17667
ICS:
97.160 Tekstilije za dom. Perilo Home textiles. Linen
97.190 Otroška oprema Equipment for children
97.200.30 Oprema za taborjenje in Camping equipment and
tabori camp-sites
oSIST prEN 17667:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 17667:2021
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oSIST prEN 17667:2021
DRAFT
EUROPEAN STANDARD
prEN 17667
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2021
ICS 97.160; 97.190; 97.200.30
English Version
Test method - Determination of thermal resistance of filled
textile articles and similar items using small guarded
hotplate apparatus
Prüfverfahren zur Bestimmung des
Wärmedurchgangswiderstands von
Kinderschlafsäcken, -bettdecken und -daunendecken
mittels einer kleinen geschützten Wärmeplatte
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 248.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17667:2021 E
worldwide for CEN national Members.
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oSIST prEN 17667:2021
prEN 17667:2021 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Apparatus . 6
6 Conditioning . 9
7 Test samples . 9
8 Test procedure . 9
9 Test report . 11
10 Accuracy and precision . 12
Annex A (informative) Alternative method of determination of thermal resistance of air
layer . 13
A.1 Determination of thermal resistance of air layer . 13
Annex B (informative) Guidance on labelling of thermal resistance . 14
B.1 Guidance on labelling of thermal resistance . 14
Bibliography . 15
2
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oSIST prEN 17667:2021
prEN 17667:2021 (E)
European foreword
This document (prEN 17667:2021) has been prepared by Technical Committee CEN/TC 248 “Textile
and textile products”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
3
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oSIST prEN 17667:2021
prEN 17667:2021 (E)
Introduction
This test method has been developed to provide a simple method of determining the thermal resistance
of filled textile products and similar articles using a small guarded hotplate apparatus. Other methods
such as ISO 5085-1 and EN ISO 11092 may have limitations on the range of their measurement
capability and/or require the use of complex apparatus. The apparatus used in this method is broadly
comparable with that specified in ISO 5085-1 but with a number of differences which are intended to
provide a more reliable test result. It is based on a test method British Standard BS 8510:2007 which
has proven successful in the United Kingdom over a period of more than 10 years.
This test method measures thermal resistance in a similar manner to ISO 11092 when using R mode
ct
but is a simplified version of the test method. Limited trials in the development of this test method
indicate that it has a good correlation with other test methods in use including ISO 5085-1 in single
plate mode and ISO 11092.
4
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oSIST prEN 17667:2021
prEN 17667:2021 (E)
1 Scope
This method of test described a means of determining the thermal resistance of textiles articles which
may be filled e.g. padded coats and jackets, child sleep bags, cot duvets, etc., or textiles articles with a
2
thermal resistance of up to 0,5 m K/W (5,0 tog) and/or which do not have uniform thickness.
2
The test method is suitable for products with a thermal resistance within the range 0,025 m K/W (0,25
2
tog) to approximately 0,5 m K/W (5,0 tog) but is limited only by the ability of the test apparatus to cope
with the thickness of the test sample.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 139, Textiles — Standard atmospheres for conditioning and testing (ISO 139)
ISO 8302, Thermal insulation — determination of steady state thermal resistance and related properties
— guarded hotplate apparatus
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
textile article
any textile product formed of a single layer of textile or multiple layers of textile material, with or
without a filling material (textile or non-textile) present
3.2
children’s sleep bag
bedding item consisting of a full length fabric bag, which may be lined or filled, with a neck opening and
armholes, designed to contain a child which may be used in conjunction with nightwear
[SOURCE: EN 16781:2018, definition 3.1]
3.3
cot duvet
bedding item intended to cover the child’s body, consisting of a filling material permanently sewn into a
textile over intended to be used with or without a secondary removable textile cover
[SOURCE: EN 16779-1:2018, definition 3.1]
3.4
thermal resistance, R
ratio of the temperature difference between the two faces of a test sample to the rate of flow of heat per
unit area to the faces
5
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oSIST prEN 17667:2021
prEN 17667:2021 (E)
Note 1 to entry: The thermal resistance may also be known as its ‘tog’ value.
[SOURCE: ISO 5085-1:1989, definition 3.1]
3.5
tog value
ten times the temperature difference between the two faces of a sample (in K) when the heat flow
2
across the unit area is equal to 1 W/m
2
Note 1 to entry: 1 tog = 0,1 m K/W
3.6
indoor ambient condition
for the purpose of this test method, take the standard atmosphere as defined in EN ISO 139
4 Principle
The textile article to be tested is placed on a horizontal heated plate at 306 K (skin surface temperature)
and the opposite face is exposed to an ambient room temperature. The power required to maintain
thermal equilibrium (“steady state”) over a period of not less than 60 min is measured and the thermal
resistance of the item is determined.
5 Apparatus
5.1 General
The apparatus shall be built and operated in accordance with the principles of ISO 8302. See Figure 1.
5.2 Thermal resistance tester
The apparatus for the determination of thermal resistance shall be designed so that it complies with the
following:
a) the apparatus shall be horizontal, with the heat flow upwards and designed so that measurements
are made between the upper hot face and the ambient air above the test sample;
b) the surface of the upper hot face of the apparatus shall be flat, isothermal, metal and have a finish
such that the emissivity is not less than 0,9. The central measuring area shall be not less than
200 mm by 200 mm but not greater than 350 mm by 350 mm. The guard area or effective guard
area around the central measuring area shall be at least 50 mm wide;
NOTE A matt black finish has been found to be suitable.
c) there shall be a suitable means for measuring the temperature of the upper surface of the hot face
and of the air temperature of the air layer above the test sample to an accuracy of 0,2 K;
d) sets of at least five temperature sensors, each set uniformly distributed over the central measuring
area, shall be used to measure the upper hot face and lower hot face temperatures;
e) a set of at least five shielded temperature sensors uniformly distributed over the central measuring
area shall be used to measure the temperature of the air layer above the test sample. These shall be
located directly above the corresponding sensors in the central measuring area; (see Annex A for
more information);
6
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oSIST prEN 17667:2021
prEN 17667:2021 (E)
f) the upper hot face temperature and the temperature of the air layer above the test sample shall be
capable of being controlled to ± 2,0 K;
g) the apparatus shall be located within a test environment maintained in accordance with the
standard temperate atmosphere as defined in ISO 139. The apparatus shall be screened from
external sources of heat (e.g. effects of lighting, other apparatus, etc.), and from draughts (e.g.
caused by movement of personnel or opening of nearby doors, etc.);
h) the apparatus shall be equipped with suitable instrumentation for the recording of the individual
temperatures of the upper hot face, lower hot face and air layer above the test sample and energy
required. The instrumentation shall be able to record at least 3 readings per minute;
i) the thermal resistance of the test sample plus the air layer (R ) is determined from the energy
t
dissipated in the central heater, the area of the central heater and the temperature difference T .
1
The temperature difference T is maintained at zero.
2
7
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oSIST prEN 17667:2021
prEN 17667:2021 (E)
Key
1 temperature
2 temperature difference
6 insulation
8 central measuring area
9 central heathers
10 guard heaters
11 guard area
t temperature of the air layer above the quilt
0
t the upper hot face temperature
1
t the lower hot face temperature
2
T the difference between the upper hot face temperature and the temperature of the air layer above the test
1
sample
T the difference between the lower hot face temperature and the upper hot face temperature
2
x denotes temperature sensors
Figure 1 — Apparatus for the determination of thermal resistance of test sample
5.3 Support frames
Support frame(s) of dimensions so as to ensure the intimate contact of the under-surface of the sample
with the hotplate and support any part(s) of the test sample which is greater than the area of the
measuring place (including any guard area).
5.4 Conditioning racks
Racks of dimensions such that it is possible to place the sample to be tested horizontally or vertically
and without distortion, and for air to circulate over the whole of the upper surface of the test sample.
It is important that if samples are conditioned vertically that the sample is positioned in an orientation
that will not result in a change to the filling distribution (e.g. any filling channels should be oriented
horizontally).
5.5 Reference materials
A series of at least three separate reference materials with known thermal resistances ranging from
2 2
approximately 0,05 m K/W (0,5 tog) to 0,5 m K/W (5,0 tog) that can be used fo
...
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