SIST EN 16855-2:2019
(Main)Walk-in cold rooms - Definition, thermal insulation performance and test methods - Part 2: Customized cold rooms
Walk-in cold rooms - Definition, thermal insulation performance and test methods - Part 2: Customized cold rooms
This European Standard provides test or calculation methods to assess thermal insulation performances for customized walk-in cold rooms and components under normal end-use conditions.
The normal end-use conditions of a walk-in cold room are considered to be:
- installation inside an existing building;
- not exposed to external weather conditions;
- internal side of panels subject to temperatures within the indicative range −40 °C ≤ T ≤ 12 °C;
- external side of panels subject to temperatures within the indicative range −8 °C ≤ T ≤ 30 °C; temperatures below 0 °C, or higher than 20 °C, can be reached if the walk-in cold room is located inside not air-conditioned premises.
NOTE In case the customized walk-in cold room working at medium storage temperature is used as a food processing room or a clean room, the standard is applied.
Begehbare Kühlräume - Definitionen, Wärmedämmung und Prüfmethoden - Teil 2: Maßgefertigte Bauteile für Kühlräume
Diese Norm legt Prüf oder Berechnungsverfahren zur Bewertung des Wärmedämmverhaltens von maßgefertigten begehbaren Kühlräumen und Bauteilen unter normalen Bedingungen der Endnutzung fest.
Als normale Umgebungsbedingungen der Endnutzeranwendung eines begehbaren Kühlraums sind zu berücksichtigen:
- Aufstellung innerhalb eines vorhandenen Gebäudes;
- der Kühlraum ist nicht den äußeren Wetterbedingungen ausgesetzt;
- die Innenseiten der Elemente sind Temperaturen innerhalb eines Anzeigebereichs von 40 °C ≤ T ≤ 12 °C ausgesetzt;
- die Außenseiten der Elemente sind Temperaturen innerhalb eines Anzeigebereichs von 8 °C ≤ T ≤ 30 °C ausgesetzt; falls der begehbare Kühlraum innerhalb eines Gebäudes ohne Klimaanlage aufgestellt ist, können Temperaturen unter 0 °C oder über 20 °C erreicht werden.
ANMERKUNG Die Norm ist anwendbar, wenn maßgefertigte begehbare Kühlräume, die bei mittleren Lagertemperaturen arbeiten, zur Nahrungsmittelverarbeitung oder als Reinraum verwendet werden.
Chambres froides - Définition, performance d'isolation thermique et méthodes d'essai - Partie 2 : Chambres froides personnalisées
La présente Norme européenne fournit des méthodes d'essai ou de calcul pour évaluer les performances d'isolation thermique de chambres froides personnalisées et de leurs composants dans les conditions normales d'utilisation finale.
On considère que les conditions normales d'utilisation finale d'une chambre froide sont les suivantes :
- installation à l'intérieur d'un bâtiment existant ;
- pas d'exposition aux conditions climatiques extérieures ;
- côté intérieur des panneaux soumis à des températures comprises dans la plage indicative −40 °C ≤ T ≤ 12 °C ;
- côté extérieur des panneaux soumis à des températures comprises dans la plage indicative −8 °C ≤ T ≤ 30 °C ; des températures inférieures à 0 °C ou supérieures à 20 °C peuvent être atteintes si la chambre froide est située dans des locaux non climatisés.
NOTE Si la chambre froide personnalisée fonctionnant à une température de stockage moyenne est utilisée en tant que salle de transformation de produits alimentaires ou en tant que salle blanche, la norme est appliquée.
Dostopne hladilnice - Definicije, toplotnoizolacijske lastnosti in preskusne metode - 2. del: Prilagojene hladilnice
Ta evropski standard zagotavlja preskusne ali računske metode za ocenjevanje toplotnoizolacijskih lastnosti za prilagojene dostopne hladilnice in komponente v običajnih pogojih končne uporabe.
Šteje se, da so običajni pogoji končne uporabe v dostopni hladilnici:
– namestitev znotraj obstoječe zgradbe;
– neizpostavljenost zunanjim vremenskim razmeram;
– notranja stran panelov, ki so izpostavljeni temperaturam v indikativnem razponu −40 °C ≤ T ≤ 12 °C;
– zunanja stran panelov, ki so izpostavljeni temperaturam v indikativnem razponu −8 °C ≤ T ≤ 30 °C; temperature pod 0 °C ali višje od 20 °C je mogoče doseči, če je dostopna hladilnica znotraj neklimatiziranega objekta.
OPOMBA: Standard se uporablja tudi v primeru, če se prilagojena dostopna hladilnica, ki deluje pri srednji temperaturi shranjevanja, uporablja kot prostor za predelavo hrane ali čista soba.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 16855-2:2019
01-februar-2019
Dostopne hladilnice - Definicije, toplotnoizolacijske lastnosti in preskusne metode
- 2. del: Prilagojene hladilnice
Walk-in cold rooms - Definition, thermal insulation performance and test methods - Part
2: Customized cold rooms
Begehbare Kühlräume - Definitionen, Wärmedämmung und Prüfmethoden - Teil 2:
Maßgefertigte Bauteile für Kühlräume
Chambres froides - Définition, performance d'isolation thermique et méthodes d'essai -
Partie 2 : Chambres froides personnalisées
Ta slovenski standard je istoveten z: EN 16855-2:2018
ICS:
97.130.20 Hladilne naprave za trgovine Commercial refrigerating
appliances
SIST EN 16855-2:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 16855-2:2019
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SIST EN 16855-2:2019
EN 16855-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 97.130.20
English Version
Walk-in cold rooms - Definition, thermal insulation
performance and test methods - Part 2: Customized cold
rooms
Chambres froides - Définition, performance d'isolation Begehbare Kühlräume - Definitionen, Wärmedämmung
thermique et méthodes d'essai - Partie 2 : Chambres und Prüfmethoden - Teil 2: Maßgefertigte Bauteile für
froides personnalisées Kühlräume
This European Standard was approved by CEN on 25 June 2018.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16855-2:2018 E
worldwide for CEN national Members.
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EN 16855-2:2018 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Symbols and abbreviations . 13
5 Performance . 13
6 Methods to assess thermal insulation performances of customized walk-in cold
room components . 15
7 Methods to assess thermal insulation performances of customized walk-in cold
rooms and total power consumption . 23
8 Installation of walk-in cold rooms . 24
Annex A (normative) Determination of the declared values of thermal resistance and
thermal conductivity . 26
A.1 General. 26
A.2 Input data. 26
A.3 Declared values . 26
Annex B (normative) Determination of the aged values of thermal resistance and thermal
conductivity . 28
B.1 General. 28
B.2 Sampling and conditioning . 29
B.3 Measurement of the initial value of the thermal conductivity . 29
B.4 Evaluation of the thermal conductivity value with the accelerated ageing . 29
B.5 Fixed increments method . 30
B.6 Declaration of the aged values of thermal resistance and thermal conductivity . 32
Annex C (informative) Walk-in cold rooms documentation and control . 34
C.1 Documentation . 34
C.2 Factory Production Control (FPC) . 35
Annex D (informative) Recommendations on installation . 37
D.1 General. 37
D.2 Preliminary provisions . 37
D.3 Installation, assembly and fixing of panels . 38
D.4 Maintenance and cleaning of the walk-in cold room . 51
Bibliography . 53
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EN 16855-2:2018 (E)
European foreword
This document (EN 16855-2:2018) has been prepared by Technical Committee CEN/TC 44
“Commercial and Professional Refrigerating Appliances and Systems, Performance and Energy
Consumption”, the secretariat of which is held by UNI.
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 June 2019, and conflicting national standards shall be
withdrawn at the latest by June 2019.
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.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
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Introduction
This document was drafted following the necessity to compare the systems placed on the market on the
base of the minimum thermal insulation requirements and to establish the average level of energy
consumption for a future minimum energy performance standard definition, with reference to the EU
policy on increasing energy efficiency of energy related products (Directive 2009/125/EC) in the frame
of the EU “20-20-20” targets.
It was necessary to identify the reference standards for calculation, measurement of insulation
properties, identify the best practice rules for elimination of thermal bridges, assembly techniques and
provisions to be taken in order to ensure the best level of insulation and power consumption.
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1 Scope
This document provides test or calculation methods to assess thermal insulation performances for
customized walk-in cold rooms and components under normal end-use conditions.
The normal end-use conditions of a walk-in cold room are considered to be:
— installation inside an existing building;
— not exposed to external weather conditions;
— internal side of panels subject to temperatures within the indicative range −40 °C ≤ T ≤ 12 °C;
— external side of panels subject to temperatures within the indicative range −8 °C ≤ T ≤ 30 °C;
temperatures below 0 °C, or higher than 20 °C, can be reached if the walk-in cold room is located
inside not air-conditioned premises.
NOTE In case the customized walk-in cold room working at positive storage temperature is used as a food
processing room or a clean room, the standard is applied.
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 12086, Thermal insulating products for building applications - Determination of water vapour
transmission properties
EN 12667:2001, Thermal performance of building materials and products - Determination of thermal
resistance by means of guarded hot plate and heat flow meter methods - Products of high and medium
thermal resistance
EN 12865, Hygrothermal performance of building components and building elements - Determination of
the resistance of external wall systems to driving rain under pulsating air pressure
EN 12939, Thermal performance of building materials and products - Determination of thermal resistance
by means of guarded hot plate and heat flow meter methods - Thick products of high and medium thermal
resistance
EN 13162, Thermal insulation products for buildings - Factory made mineral wool (MW) products -
Specification
EN 13163, Thermal insulation products for buildings - Factory made expanded polystyrene (EPS) products
- Specification
EN 13164, Thermal insulation products for buildings - Factory made extruded polystyrene foam (XPS)
products - Specification
EN 13165, Thermal insulation products for buildings - Factory made rigid polyurethane foam (PU)
products - Specification
EN 13166, Thermal insulation products for buildings - Factory made phenolic foam (PF) products -
Specification
5
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EN 13167, Thermal insulation products for buildings - Factory made cellular glass (CG) products -
Specification
EN ISO 4590, Rigid cellular plastics - Determination of the volume percentage of open cells and of closed
cells (ISO 4590)
EN ISO 6946, Building components and building elements - Thermal resistance and thermal transmittance
- Calculation methods (ISO 6946)
EN ISO 10077-1, Thermal performance of windows, doors and shutters - Calculation of thermal
transmittance - Part 1: General (ISO 10077-1)
EN ISO 10077-2, Thermal performance of windows, doors and shutters - Calculation of thermal
transmittance - Part 2: Numerical method for frames (ISO 10077-2)
EN ISO 10211, Thermal bridges in building construction - Heat flows and surface temperatures - Detailed
calculations (ISO 10211)
EN ISO 10456, Building materials and products - Hygrothermal properties -Tabulated design values and
procedures for determining declared and design thermal values (ISO 10456)
EN ISO 12572, Hygrothermal performance of building materials and products - Determination of water
vapour transmission properties - Cup method (ISO 12572)
EN ISO 14683, Thermal bridges in building construction - Linear thermal transmittance - Simplified
methods and default values (ISO 14683)
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 http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
walk-in cold room
thermally insulated enclosure made of sandwich panels intended for the storage of chilled and/or
frozen perishable items, accessible via at least one door, and which is large enough to let somebody
walk in it
3.1.1
customized walk- in cold room
walk-in cold room installed by assembling the single components, requiring on-site cutting of the
sandwich panels
3.1.2
customized walk-in cold room with floor
walk-in cold room equipped with a thermally insulated floor, above ground level or embedded in the
ground; the room has all insulated faces
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3.1.3
customized walk-in cold room with pre-insulated floor
walk-in cold room equipped with a thermally insulated floor embedded in the ground, below ground
level, covered with a structural layer (i.e.: concrete) usually levelled to the external ground level; the
room has all insulated faces
3.1.4
customized walk-in cold room without floor
walk-in cold room without a thermally insulated floor; the room has only insulated walls and ceiling
3.1.5
walk-in cold room component
element that, when assembled together, compose a walk-in cold room; components can be for example:
panels, doors, corner flashings, claddings and profiles used for head-to-head panels connection
3.2
sandwich panel
building product consisting of two metal faces positioned on either side of a core that is a thermally
insulating material, which is firmly bonded to both faces so that the three components act compositely
when under load, with different type of perimetrical profile
[SOURCE: EN 14509:2013, 3.17]
3.3
perimetrical design
cross section and characteristics of the perimetrical surface of the sandwich panel related to the joint
system
Note 1 to entry: A perimetrical design is realized with 3.3.1, 3.3.2 and 3.3.3 or a combination of 3.3.1, 3.3.2 and
3.3.3 or none of them.
3.3.1
male-female perimetrical design
design solution that allows sealing, structural resistance, thermal insulation, correct alignment at
installation
3.3.2
gasket perimetrical design
design solution that allows sealing by embedding into a sandwich panel a sealing material
3.3.3
camlock perimetrical design
design solution that allows sealing, structural resistance, mechanical locking between adjacent
sandwich panels
3.3.4
edge of the panel
side of the panel where adjacent panels join together in the same plane along the width
Note 1 to entry: See Figure 1.
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Key
1 edge of panel
2 length
3 width
Figure 1 — Example of the edge of the panel
3.3.5
longitudinal edge of the panel
side of the panel where adjacent panels join together in the same plane along the length
Note 1 to entry: See Figure 2.
Key
1 longitudinal edge of panel
2 length
3 width
Figure 2 — Example of longitudinal edge of the panel
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3.4
overall heat transfer coefficient
measure of the global insulating thermal performance of a walk-in cold room envelope, assembled with
doors and all ancillaries, in terms of heat flux per unit area per degree difference in temperature
3.5
mean surface area
S
surface area calculated by the geometric mean between the outside surface area and the inside surface
area
3.6
surface heat transfer coefficient
heat flux per unit area per degree difference in temperature
3.7
surface thermal resistance
ratio between temperature difference and heat flux through the surface
3.8
air curtain
technical equipment, producing a controlled stream of (cold) air aimed across an opening to create an
air seal that separates different environments, while allowing flow of traffic and unobstructed vision
through the opening
3.9
strip curtain
provision, made of strips, preventing sudden heat gains, when opening doors
3.10 Types of door
3.10.1
hinged door
door whose actuation takes place by means of rotation of the door leaf around the axis of rotation of the
hinges
3.10.2
sliding door
door whose actuation takes place by means of sliding of the door leaf parallel to the wall
3.10.3
swing door
hinged door whose door leaf can rotate in both directions
3.10.4
roll shutter
door whose actuation takes place by means of rolling and unrolling of the flexible door leaf
3.11
mechanical closing device
mechanical device that helps self-closing of the door, and avoids door leaf to remain ajar, used to reduce
energy losses and keep internal temperature
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3.12
door switch device
switch to control evaporator fan motors, internal lighting, alarm and other device improving energy
saving
3.13
thermal bridge
part of the walk-in cold room where the otherwise uniform thermal resistance is significantly changed
by a material and/or geometrical discontinuity
3.13.1
linear thermal bridge
thermal bridge with a uniform cross-section along one of the three orthogonal axes
[SOURCE: EN ISO 10211:2007, definition 3.1.2]
3.13.2
punctual thermal bridge
localized thermal bridge whose influence can be represented by a punctual thermal transmittance
3.14
insulating material
thermally insulated product with a declared thermal conductivity lower than 0,06 W/(m•K) at 10 °C
3.15
ageing
worsening of the thermal properties of an insulating material or structure along time
3.16
linear thermal transmittance
heat flow rate in the steady state divided by length and by the temperature difference between the
environments on either side of a thermal bridge
3.17
punctual thermal transmittance
heat flow rate in the steady state divided by the temperature difference between the environments on
either side of a thermal bridge (W/K)
3.18
walk-in cold room ceiling
covering of the walk-in cold room
3.19
core
layer of material, having thermal insulating properties, which is bonded between two metal faces
3.20
face, facing
flat, lightly profiled or profiled thin metal sheet firmly bonded to the core
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3.21
fixing (fastening) system
system, fastening panels to the supporting system or other components to the panels or components to
each other
3.22
joint
interface between two panels where the meeting edges have been designed to allow the panels to join
together in the same plane
[SOURCE: EN 14509:2013, definition 3.13]
3.23
junction
connection between adjacent panels and corners, for example wall to wall, wall to ceiling, wall to floor
3.24
storage temperature
target storage temperature which is intended to be maintained within the operating walk-in cold room
3.25
positive storage temperature
PT
any temperature above −5 °C and below 12 °C, for chilled perishable items storage
3.26
negative storage temperature
NT
any temperature below −5 °C, for frozen perishable items storage
3.27
gross storage volume
internal dimensions of the cold room, measured from floor to ceiling and from left to right (total height
3
x total width x total length in cubic meters (m ))
3.28
thermal conductivity
property of a material to conduct heat
3.29
thermal insulation
property of a material of reducing transfer of thermal energy through its thickness
3.30
supporting profile
system not structural part of the building, used to permanently support ceiling panels (when
necessary), cooling systems, and other equipment of the walk in cold room
3.31
significant figure
digits that carry meaning contributing to the number precision, considering that leading zeros and
trailing zeros placeholders merely indicating the scale are not significant
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3.32
product sample
part of the sandwich panel or door leaf obtained by cutting in the central part of the same product,
including any facings and core material
3.33
test specimen
slice of core material to be tested, taken from the middle thickness at an equal distance from the
product sample edges
3.34
group of walk-in cold rooms components
walk-in cold rooms components of similar chemical and physical characteristics, produced on the same
production line
3.35
edge to edge panels connection
system used to connect the heads of adjacent panels that have been previously cut on-site along the
width of the panel
3.36
longitudinal edge by longitudinal edge joint
connection between panels that have been previously cut on-site along the length of the panel
3.37
pre-insulated floor
thermally insulated floor embedded in the ground, below ground level, consisting of several layers
made of different materials or components
3.38
significant layer
layer of the pre-insulated floor that gives a not negligible contribution to the calculation of the thermal
transmittance of the floor
3.39
concrete support below lower vapor barrier
slab made of concrete supporting the customized walk-in cold room, giving a negligible contribution to
the calculation of the thermal transmittance of the floor
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4 Symbols and abbreviations
2
U thermal transfer coefficient (W/m•K)
2
U overall heat transfer coefficient (W/m•K)
tot
2
U single component heat transfer coefficient (W/m•K)
j
W heating power (W)
2
S mean surface area (m )
2
R thermal resistance (m•K/W)
2
R Declared value of thermal resistance (m•K/W)
D
D thickness (m)
λ thermal conductivity coefficient (W/m•K)
2
h surface heat transfer coefficient (W/m•K)
l length (m)
Ψ linear thermal transmittance of the joints per metre length of the panel (W/m•K)
Χ punctual thermal bridges transmittance (W/K)
Subscripts
n nominal
i internal
e external
c core
f facing
s surface
f fluid (air)
w wall
a air
j generic index
5 Performance
5.1 General
Performance characteristics of walk-in cold rooms shall be assessed in terms of thermal insulating
properties, in order to give a basis on which assessing energy consumption related properties of walk-
in cold rooms, and of their components.
Performance characteristics shall be assessed for every single component of the walk-in cold room and
for the assembled walk-in cold room as a whole.
For the calculations or tests, the reference point for walk-in cold rooms working at positive storage
temperature is T = +5 °C, and for negative storage temperature is T = −18 °C.
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5.2 Thermal insulation performances
Thermal insulation performances of customized walk-in cold rooms are assessed by considering the
relevant characteristic of every single component of a walk-in cold room, which shall be assessed by
test and/or by calculations. Components of walk-in cold rooms can be identified as follows:
— wall and ceiling panels;
— floor panels;
— pre-insulated floor;
— door(s);
— window(s);
— fixing systems and junctions;
— supporting profiles.
For comparison walk-in cold rooms with and without thermally insulated floor will be considered.
Air infiltration through the open door will be considered in terms of devices to avoid or limit the ingress
of ambient air, from the environment outside the walk-in cold room. A classification of the used device
will be proposed, in order to evaluate the contribution to the improvement of walk-in cold room
performance characteristics in terms of energy consumption.
5.3 Other performances
5.3.1 Air permeability
Considering a useful life of the cold room of 10 years, taking into account the extremely low air
permeability of the metal facings, air permeability of the panels is considered to have negligible effects
on the behaviour of the room. Consequently no assessment is required. For different facing materials
the air permeability shall be determined according to EN ISO 10456, unless tabulated values are
available from other European Standards.
Air permeability of the joints shall be assessed according to EN 12865.
5.3.2 Water vapour permeability
The content of 5.3.1 is also valid for water vapour permeability.
Water vapour permeability of the joints shall be assessed according to EN 12086 or EN ISO 12572.
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6 Methods to assess thermal insulation performances of customized walk-in
cold room components
6.1 General
The assessment of energy consumption related characteristics of single components of a walk-in cold
room will be performed considering the following aspects:
A. Thermal conductivity of sandwich panels core
B. Thermal transmittance of wall and ceiling panels
C. Thermal transmittance of floor panels
D. Thermal transmittance of pre-insulated floor
E. Thermal transmittance of doors
F. Thermal transmittance of windows
G. Thermal transmittance of joints and junctions
H. Influence of the supporting profiles
Gaskets are considered components of the doors, and sealants are considered part of the fixing system
that is tested like reported in 6.6, 6.7 and 6.8.
6.2 Thermal conductivity of the insulating core of wall, ceiling and floor panels
Assessment of thermal conductivity of core material of components as in B, C, D and E, of 6.1, is
performed according to EN 12667 or EN 12939 for products of high thickness.
Thermal conductivity shall be determined according to Annex A and B, and declared by the
manufacturer according to the following conditions:
— average temperature is (10 ± 0,3) °C;
— measured values shall be expressed with three significant figures;
— the thermal resistance, R , shall always be declared; the thermal conductivity, λ , shall be declared
D D
when possible;
— the thermal resistance, R , and the thermal conductivity, λ , shall be expressed as representative
D D
limit values of at least 90 % of production, with a level of confidence of 90 %;
— the thermal conductivity value λ90/90 shall be rounded to three significant figures expressed in
rounded to three significant figures and expressed W/(m•K);
W/m∙K and declared as λD
— the declared thermal resistance, R , shall be calculated according to the nominal thickness, d , and
D N
the relevant thermal conductivity value λ unless measured directly;
90/90,
— the thermal resistance value, R , when calculated according to the nominal thickness, d , and the
90/90 N
relevant thermal conductivity value, λ , shall be rounded downwards to three significant figures
90/90
2
and expressed in m•K/W, and declared as R with three significant figures and expressed in
D
2
m•K/W;
— the thermal resistance value, R , for those products whose thermal resistance is measured
90/90
2
directly, shall be rounded downwards to three significant figures and expressed in m•K/W, and
2
declared as RD with three significant figures and expressed in m•K/W.
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SIST EN 16855-2:2019
EN 16855-2:2018 (E)
Thermal resistance and thermal conductivity shall be determined in acco
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