CEN/TS 15548-1:2014

SLOVENSKI STANDARD
01-september-2014
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Thermal insulation products for building equipment and industrial installations -
Determination of thermal resistance by means of the guarded hot plate method - Part 1:
Measurements at elevated temperatures from 100 °C to 850 °C
Wärmedämmstoffe für die Haustechnik und für betriebstechnische Anlagen -
Bestimmung des Wärmedurchlasswiderstandes nach dem Verfahren mit dem
Plattengerät - Teil 1: Messungen bei erhöhten Temperaturen von 100 °C bis 850 °C
Produits isolants thermiques pour les équipements de bâtiments et les installations
industrielles - Détermination de la résistance thermique par la méthode de la plaque
chaude gardée - Partie 1: Mesurages à haute témperature entre 100 °C et 850 °C
Ta slovenski standard je istoveten z: CEN/TS 15548-1:2014
ICS:
91.100.60 0DWHULDOL]DWRSORWQRLQ Thermal and sound insulating
]YRþQRL]RODFLMR materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 15548-1
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
August 2014
ICS 91.100.60 Supersedes CEN/TS 15548-1:2011
English Version
Thermal insulation products for building equipment and industrial
installations - Determination of thermal resistance by means of
the guarded hot plate method - Part 1: Measurements at
elevated temperatures from 100 °C to 850 °C
Produits isolants thermiques pour les équipements de Wärmedämmstoffe für die Haustechnik und für
bâtiments et les installations industrielles - Détermination de betriebstechnische Anlagen - Bestimmung des
la résistance thermique par la méthode de la plaque chaude Wärmedurchlasswiderstandes nach dem Verfahren mit dem
gardée - Partie 1: Mesurages à haute témperature entre Plattengerät - Teil 1: Messungen bei erhöhten
100 °C et 850 °C Temperaturen von 100 °C bis 850 °C
This Technical Specification (CEN/TS) was approved by CEN on 28 June 2014 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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. CEN/TS 15548-1:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions, symbols and units .5
3.1 Terms and definitions .5
3.2 Symbols and units .5
4 Principle .6
4.1 Apparatus .6
4.2 Measuring the density of heat flow rate .6
4.3 Measuring the temperature difference .6
4.4 Deriving the thermal resistance or transfer factor .6
4.5 Computing thermal conductivity or thermal transmissivity .6
4.6 Apparatus limits .7
4.7 Specimen limits.7
5 Apparatus description and design requirement .7
5.1 General .7
5.2 Two specimen apparatus .8
5.3 Single specimen apparatus .8
5.4 Plates .8
5.5 Main heating unit . 10
5.6 Edge insulation and auxiliary guards . 11
5.7 Cold plates . 11
5.8 Thickness measurement system . 11
5.9 Accuracy and repeatability . 11
5.10 Uncertainty analysis and equipment performance checks . 11
6 Test specimen . 12
6.1 General . 12
6.2 Selection and size . 12
6.3 Specimen preparation . 12
7 Testing procedure. 13
7.1 General . 13
7.2 Conditioning . 13
7.3 Measurements . 13
8 Calculations and test report . 15
8.1 Density and mass changes . 15
8.2 Heat transfer properties . 16
9 Test report . 17
Annex A (normative) Limits for equipment performance and test conditions . 19
A.1 General . 19
A.2 Accuracy and repeatability, stability, uniformity . 19
A.3 Suggested apparatus sizes . 20
A.4 Equipment design requirements . 20
A.5 Acceptable specimen characteristics . 21
A.6 Acceptable testing conditions . 22
Foreword
This document (CEN/TS 15548-1:2014) has been prepared by Technical Committee CEN/TC 89 “Thermal
performance of buildings and building components”, the secretariat of which is held by SIS.
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 CEN/TS 15548-1:2011.
Significant changes between this and the previous edition are:
— In clause 5.4.3, modifications of Figure 1 and Figure 2; now denoted Figure 1a and Figure 1b
— In A.4, for clause 2.1.4.1.2, the value for minimum numbers of sensors is changed to 10√A or 2
— In A.6, for clause 1.7.3, the values are changed to 20 K and 50 K respectively.
— In A.6, for clause 3.3.3, the lower and upper limits of temperature differences across the specimen have
been changed to 30 K and 70 K respectively.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this Technical Specification: 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.
Introduction
This Technical Specification is an interim solution to the need for a standard to complement EN 12667:2001 in
the approximate temperature range 100 °C to 850 °C.
The Technical Specification is chosen to publish the knowledge gained in the field of measuring thermal
conductivity at elevated temperature now, as the finalisation of a standard is a complex matter requiring
further investigations.
Among existing apparatus for steady state thermal testing, the guarded hot plate can be operated at selected
mean temperatures over the temperature range -100 °C to 850 °C. In general these apparatus exist in three
forms covering roughly the following temperature ranges -100 °C to ambient, ambient to 100 °C and above
100 °C. However it has been found that it is not possible to achieve the uncertainties of ± 2 % claimed as
achievable for the low and ambient temperature forms when using the high temperature version in accordance
with ISO 8302. More realistic figures adopting the method and procedures detailed in this document are ± 5 %
up to 450 °C and ± 7 % at temperatures above 450 °C.
Many issues are more difficult at high temperatures. There are design issues due to apparatus material
stability, the level of temperature measurement uncertainty is higher than at ambient temperatures and there
is also greater degradation in the performance of temperature sensors when operated at high temperatures,
requiring calibration checks to be more frequent. At high temperature it is more likely to get hot spots on a
plate due to non uniformity of a heater; these could be near temperature sensors and give false readings. Any
air gaps will have greater heat flow across them due to radiation heat exchange and finally provisions for
specimen expansion or shrinkage are needed.
Due to the above considerations the following clauses of EN 12667:2001 have been expanded and detailed:
5 Apparatus
5.1 General
5.2.4 Heating Unit
5.2.5 Metering Area
5.2.6 Edge insulation and auxiliary guards
5.2.7 Cooling units
5.3.5 Accuracy and repeatability
6 Test specimens
6.2 Selection and size
7 Testing procedure
7.3.8 Settling time and measurement interval
Annex A
Annex B.2
1 Scope
This Technical Specification provides the additional information to that given in EN 12667, EN 12664,
EN 12939 and ISO 8302 on the design of apparatus and operational procedures required to determine the
thermal resistance of thermal insulation products in the t
...