EN 17956:2024
(Main)Energy efficiency classes for technical insulation systems - Calculation method and applications
Energy efficiency classes for technical insulation systems - Calculation method and applications
This document is applicable to technical insulation systems of operational installations in industry and the building services, such as pipes, ducts, vessels, equipment and built-in components.
The document specifies methods for the energy efficiency classification of insulation systems for the abovementioned components with an operational temperature range of −30 °C up to 650 °C.
The document addresses plant operators, engineers of operational installations, as well as the involved contractors such as insulation contractors and pipefitting contractors.
The design of safe surface temperatures for personal protection, as well as the prevention of condensation, is outside the scope of this document.
This document also does not apply to water-based heating and cooling systems in buildings and does not apply to directly buried district heating and district cooling pipes.
Energieeffizienzklassen für technische Dämmsysteme - Berechnungsmethoden
Dieses Dokument ist anwendbar für technische Dämmsysteme von betrieblichen Installationen in der Industrie und der technischen Gebäudeausrüstung, wie z. B. Rohrleitungen, Kanäle, Behälter, Geräte und eingebaute Komponenten,
Das Dokument legt Verfahren zur Klassifizierung der Energieeffizienz von Dämmsystemen für die oben genannten Komponenten mit einem Betriebstemperaturbereich von −30 °C bis 650 °C fest.
Das Dokument richtet sich an Anlagenbetreiber, Ingenieure von betrieblichen Installationen sowie an die beteiligten Auftragnehmer wie z. B. Anbieter für Dämmung und Rohrleitungsbau.
Die Auslegung von sicheren Oberflächentemperaturen für den Personenschutz sowie die Verhinderung von Kondensatbildung liegen außerhalb des Anwendungsbereichs dieses Dokuments.
Dieses Dokument ist nicht anwendbar für wasserbasierte Heizungs- und Kühlungssysteme in Gebäuden und auch nicht für direkt verlegte Fernwärme- und Fernkälteleitungen.
Classes d’efficacité énergétique pour les systèmes d’isolation technique - Méthodes et applications de calcul
Le présent document s’applique aux systèmes d’isolation technique des installations opérationnelles de l’industrie et du bâtiment, comme les conduits, les gaines, les réservoirs, les équipements et les composants intégrés.
Ce document spécifie des méthodes de classement de l’efficacité énergétique des systèmes d’isolation pour les composants susmentionnés, en tenant compte d’une plage de températures de fonctionnement allant de −30 °C à 650 °C.
Il s’adresse aux exploitants d’installations, aux ingénieurs au sein des installations opérationnelles, ainsi qu’aux entrepreneurs concernés comme les entrepreneurs spécialisés dans l’isolation et dans la tuyauterie.
La conception de températures de surface sûres pour la protection personnelle, ainsi que la prévention de la condensation, ne relève pas du domaine d’application du présent document.
Ce document ne s’applique pas non plus aux systèmes de chauffage et de refroidissement hydrauliques des bâtiments ni aux conduits de chauffage et de refroidissement urbains directement enterrés.
Razredi energijske učinkovitosti za tehnične izolacijske sisteme - Računska metoda in uporaba
Ta dokument zajema tehnične izolacijske sisteme operativnih instalacij v industriji in stavbnih sistemih, kot so cevi, kanali, posode, oprema ter vgrajene komponente.
Dokument vsebuje metode za razvrščanje energijske učinkovitosti izolacijskih sistemov za zgoraj omenjene komponente z delovnim temperaturnim območjem od –30 °C do 650 °C.
Namenjen je upravljavcem obratov, inženirjem operativnih instalacij ter vključenim izvajalcem, kot so izvajalci izolacije in vodovodnih napeljav.
Zasnova varnih površinskih temperatur za zaščito osebja ne spada na področje uporabe tega dokumenta. Ta dokument se prav tako ne uporablja za sisteme ogrevanja, hlajenja in prezračevanja v stavbah ter neposredno zakopane cevi za daljinsko ogrevanje in hlajenje.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2024
Razredi energijske učinkovitosti za tehnične izolacijske sisteme - Računska
metoda in uporaba
Energy efficiency classes for technical insulation systems - Calculation method and
applications
Heizungsanlagen und wassergeführte Kühlanlagen in Gebäuden -
Energieeffizienzklassen für technische Dämmsysteme - Berechnungsmethoden
Classes d’efficacité énergétique pour les systèmes d’isolation technique - Méthodes et
applications de calcul
Ta slovenski standard je istoveten z: EN 17956:2024
ICS:
91.120.10 Toplotna izolacija stavb Thermal insulation of
buildings
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17956
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2024
EUROPÄISCHE NORM
ICS 91.120.10
English Version
Energy efficiency classes for technical insulation systems -
Calculation method and applications
Classes d'efficacité énergétique pour les systèmes Heizungsanlagen und wassergeführte Kühlanlagen in
d'isolation technique - Méthodes et applications de Gebäuden - Energieeffizienzklassen für technische
calcul Dämmsysteme - Berechnungsmethoden
This European Standard was approved by CEN on 29 April 2024.
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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17956:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions, symbols, units and abbreviated terms . 5
3.1 Terms and definitions . 5
3.2 Symbols, units and abbreviated terms . 6
3.2.1 Symbols and units used in this document (according to ISO) . 6
3.2.2 Abbreviated terms used in this document . 7
4 Calculation method for energy efficiency classes. 7
4.1 General . 7
4.2 Determination of the maximum allowed density of heat flow rate . 7
5 Application of energy efficiency classes . 11
5.1 General . 11
5.2 Selection of the energy efficiency performance of the insulation system . 11
5.3 Designing phase of the operational installation . 11
5.4 Dimensioning of the insulation system . 11
5.4.1 General . 11
5.4.2 Verification process for insulation systems . 12
5.4.3 Verification process for built-in components (valves, flanges, etc.) . 12
Annex A (informative) Example calculation – How to estimate the indicative space requirement
for an insulation system for a selected energy efficiency class . 13
A.1 Assumptions for the examples . 13
A.2 Calculation . 13
Annex B (informative) Example calculation – Dimensioning of a specified energy efficiency class
insulation system for pipes . 17
B.1 Assumptions for the examples (The same values as in Annex A) . 17
B.2 Insulation system consisting of a mineral wool pipe section . 18
B.3 Insulation system consisting of microporous insulation pipe sections and mineral wool
blankets . 18
Annex C (informative) Example calculation – Dimensioning of a specified energy efficiency class
insulation system for built-in components . 20
C.1 Assumptions for the examples (the same values as in Annex B) . 20
C.2 Insulation system consisting of mineral wool blankets . 20
Annex D (informative) Tabulated indicative space requirement for insulation per energy
efficiency class . 21
Annex E (informative) Tabulated maximum allowed linear density of heat flow rate per energy
efficiency class . 24
Annex F (informative) Ecological optimum . 27
Bibliography . 29
European foreword
This document (EN 17956:2024) has been prepared by Technical Committee CEN/TC 228 “Heating
systems and water-based cooling systems in buildings”, the secretariat of which is held by DIN.
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 2024, and conflicting national standards
shall be withdrawn at the latest by December 2024.
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, Türkiye and the
United Kingdom.
Introduction
In the past, technical thermal insulation systems have been primarily designed according to operational
requirements, e.g. personal protection or maximum permissible heat loss.
This document creates a uniform basis for insulating technical systems with a focus on the efficient use
of resources.
For this purpose, a classification method is defined for technical insulation systems. Depending on the
operating temperature of the system to be insulated and its basic geometric shape, the calculation
method for permissible heat flux and an indicative space requirement for the insulation system are
specified. Energy efficiency classes are derived by the maximum permissible heat flux.
This classification is intended to create a uniform communication platform for all those involved in the
operation as well as the engineering and installation of insulation systems in plant construction and
technical building equipment. The energy efficiency classes specify in a practical way the maximum heat
loss and the minimum space requirement without specifying a concrete insulation solution.
1 Scope
This document is applicable to technical insulation systems of operational installations in industry and
the building services, such as pipes, ducts, vessels, equipment and built-in components.
The document specifies methods for the energy efficiency classification of insulation systems for the
abovementioned components with an operational temperature range of −30 °C up to 650 °C.
The document addresses plant operators, engineers of operational installations, as well as the involved
contractors such as insulation contractors and pipefitting contractors.
The design of safe surface temperatures for personal protection, as well as the prevention of
condensation, is outside the scope of this document.
This document also does not apply to water-based heating and cooling systems in buildings and does
not apply to directly buried district heating and district cooling pipes.
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 12241, Thermal insulation for building equipment and industrial installations — Calculation rules
(ISO 12241)
3 Terms and definitions, symbols, units and abbreviated terms
For the purposes of this document, the following terms, definitions, symbols, units and abbreviated
terms apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1 Terms and definitions
3.1.1
operational installation
stationary technical installation inside or outside of buildings, which is used for and directly supports
the operational purpose
EXAMPLE Appliances, vessels, columns, tanks, steam generators, pipe systems, cold and hot water and
ventilation installations, etc.
3.1.2
insulation system
insulation material including all other constituent parts
EXAMPLE Cladding, vapour barrier, supporting structure, etc.
3.1.3
operating temperature
temperature at which an industrial installation is generally operated
Note 1 to entry: Also referred to as fluid temperature or medium temperature.
3.1.4
ecological optimum
ecological optimum for a best-case insulation system, dimensioned for minimum total greenhouse gas
emissions over the life cycle
Note 1 to entry: This concerns manufacture, use and disposal.
3.1.5
density of heat flow rate
flow of energy per unit of area per unit of time
Note 1 to entry: The unit for walls is watt per square metre (W/m ).
3.1.6
linear density of heat flow rate
flow of energy per unit of length per unit of time
Note 1 to entry: The unit for cylindrical objects such as ducts is watt per metre (W/m).
3.1.7
average conditions
average values which are needed to calculate the heat loss of an insulation system throughout the year
Note 1 to entry: For example, ambient temperature and wind speed.
3.1.8
indicative space requirement for an insulation system
estimated insulation thickness based on a standard reference insulation material needed to achieve the
selected insulation energy efficiency class
3.2 Symbols, units and abbreviated terms
3.2.1 Symbols and units used in this document (according to ISO)
a width of the rectangular duct section m
b height of the rectangular duct section m
b , b , auxiliary energy efficiency class coefficients –
0 1
b , b
2 3
C energy efficiency class coefficient
e Euler’s number
D external pipe diameter/hydraulic diameter m
F overall conversion factor for thermal conductivity -
G geometry coefficient -
2.
h surface heat transfer coefficient for convection W/(m K)
c
2.
h surface heat transfer coefficient for radiation W/(m K)
r
K , K application coefficients –
1 2
λ design thermal conductivity W/(m⋅K)
D
q linear density of heat flow rate of an energy efficiency class X W/m
l,X
q density of heat flow rate of an energy efficiency class X W/m
X
S indicative space requirement for the insulation system with an energy m
I,X
efficiency class X
θ mean temperature °C
m
W material coefficient –
θ operating temperature (interior - medium) °C
i
θa ambient temperature °C
The following indices are used throughout this document:
X any of the energy efficiency classes A to F
3.2.2 Abbreviated terms used in this document
EEC energy efficiency class
4 Calculation method for energy efficiency classes
4.1 General
This document establishes, for a given application, the maximum allowed density of heat flow rate of an
insulation system per energy efficiency class. The theoretical background of the calculation method
developed in 4.2 is based on the definition of the ecological optimum extracted from the VDI 4610
Part 1:2018-01 and summarized in Annex F of this document.
The calculation method for energy efficiency classes also specifies the space requirements for the
designing phase of the operational installation to ensure enough space for the insulation system,
according to the selected energy class. This dimension is defined by the indicative space requirement
for insulation systems, S (Step 4 in Table 1 and Table 2).
I,X
For a quick indication of the space requirement covering a selected range of pipe/duct sizes and
temperatures, users of this document may refer to Annex D, Tables D.1 and D.2.
4.2 Determination of the maximum allowed density of heat flow rate
The energy efficiency classes go from A to G. The classes from A to F are defined by a maximum allowed
density of heat flow rate depending on the operating temperature as well as the geometry of the
component. Any solution with a density of heat flow rate higher than F is classified G.
For an installation with an operating temperature of exactly 15 °C, no energy efficiency class can be
defined as this value is used to define the application coefficients K and K .
1 2
Table 1 and Table 2 specify the workflow to obtain the maximum allowed density of heat flow rate of
an insulation system for the selected energy efficiency class:
Table 1 is to be used for applications in the operating temperature range from above 15 °C to 650 °C.
Table 2 is to be used for applications in the operating temperature range from −30 °C to below 15 °C.
Table 1 — Calculation steps to determine the maximum allowed density of heat flow
rate for the selected insulation energy efficiency class for applications in the operating
temperature range from above 15 °C to 650 °C
a
Pipes and round geometries Rectangular ducts Walls
with (Figure 1) with
Step 1:
22⋅ a+⋅ b
D
D=
Determine the
π
geometry
G= D
G= 1,22 m
coefficient, G
If G > 1,22 m then G = 1,22 m
Operating temperature range: 15 °
i
θ + 15
i
θ = in °C
Step2:
m
Calculate the
application
−−5 7 2 −10 3
coefficients,
W 0,,047 7+ 9 548⋅ 10⋅+θθ1,516⋅ 10⋅+ 3,723⋅ 10⋅θ
mm m
K K
1, 2
0,14⋅⋅W θ − 15
0,19
i
K = K =
1 2
G
G
b +⋅bK
bK⋅
2 32
C 0, 96+⋅be ⋅ K
X 01
Step 3:
Calculate the energy
where
efficiency class
(EEC) coefficient, C
X
b b b b are the auxiliary coefficients of the selected EEC X, from Table 3
0, 1, 2, 3
Step 4:
Calculate the
G
indicative space
SC=⋅− 1 in m
( )
IX, X
requirement for
insulation systems,
S
I,X
Step 5:
Pipes, round geometries, rectangular ducts
Calculate the
Walls
maximum allowed
W⋅−θ 15
density of heat flow i
2⋅πθ⋅ W⋅ − 15
i q =
X
q = in W/m
rate for the selected
S
l,X
IX,
2⋅ S
IX,
energy efficiency
ln 1+
in W/m
class X, D
q or q
l,X X
a
Note that this document uses the concept of hydraulic diameter – a commonly used term when handling flow
in non-circular tubes. The hydraulic diameter evaluates non-circular ducts as ducts of equivalent circular
diameter.
=
=
Table 2 — Calculation steps to determine the maximum allowed density of heat flow
rate for the selected insulation energy efficiency class for applications in the operating
temperature range from −30 °C to below 15 °C
Pipes and round geometries Rectangular Walls
a
with ducts
(Figure 1) with
Step 1: D
22⋅ a+⋅ b
Determine the
D=
π
geometry
coefficient, G
G= D
G= 1,22 m
If G > 1,22 m then G = 1,22 m
Operating temperature range: −30°≤CCθ < 15 °
i
θ + 15
i
θ = in °C
Step2:
∆m
Calculate the
application
−−4 8 2 −10 3
coefficients,
W 0,,035 5+ 1 17⋅ 10⋅θθ+ 4, 85⋅ 10⋅ + 5,58⋅ 10⋅θ
∆∆mm ∆m
K K
1, 2
0,06⋅⋅W θ − 15
0,1
i
K = K =
1 2
G
G
Step 3: b +⋅bK
bK⋅
2 32
C 0, 96+⋅be ⋅ K
X 01
Calculate the
where
Energy Efficiency
Class (EEC) b b b b are the auxiliary coefficients of the selected EEC X, from Table 3,
0, 1, 2, 3
coefficient, C e is Euler’s number
X
Step 4:
Calculate the
G
indicative space
SC=⋅− 1 in m
( )
IX, X
requirement for 2
insulation systems,
S
I,X
Step 5:
Pipes, round geometries, rectangular ducts
Calculate the
Walls
maximum allowed
W⋅−θ 15
density of heat flow i
2⋅πθ⋅ W⋅ − 15
i q =
X
q =
in W/m
rate for the selected
S
l,X
IX,
2⋅ S
IX,
energy efficiency
ln 1+
in W/m
class X, D
q or q
l,X X
a
Note that this document uses the concept of hydraulic diameter – a commonly used term when handling
flow in non-circular tubes. The hydraulic diameter evaluates non-circular ducts as ducts of equivalent
circular diameter.
=
=
Table 3 gives the auxiliary EEC coefficients for the selected energy efficiency class X to be used in Table 1
and Table 2, Step 3.
Table 3 — Auxiliary EEC coefficients
Energy efficiency
b b b b
0 1 2 3
class (EEC)
A 0,732 0 –0,147 5 0,357 3 0,012 6
B 0,605 2 –0,136 2 0,342 9 0,010 2
C 0,500 6 –0,122 4 0,327 8 0,007 6
D 0,403 7 –0,105 9 0,310 6 0,004 7
E 0,325 5 –0,090 4 0,293 7 0,002 3
F 0,260 8 –0,076 9 0,276 9 0,000 3
For a quick indication of the maximum allowed linear density of heat flow rate, covering a selected range
of pipe/duct sizes and temperatures, users of this document may refer to Annex E, Tables E.1 and E.2.
Key
1 flange connections
a width of the rectangular duct section
b height of the rectangular duct section
Figure 1 — Dimensions of a rectangular duct
5 Application of energy efficiency classes
5.1 General
The classification is intended to inform asset owners about the energy efficiency level of their insulation
systems. Once the energy efficiency class is selected, it also simplifies the workflow from the general
planning of the operational installation to the execution of the insulation work. The architect or
planning engineer shall ensure that the spatial conditions allow for the selected energy efficiency class
which can then be implemented (and even improved) using appropriate insulation systems for pipes,
ducts, equipment, and built-in components. The insulation contractor is responsible for the
dimensioning and the proper execution of the insulation.
5.2 Selection of the energy efficiency performance of the insulation system
The asset owner or operator specifies the level of energy conservation of the insulation system by
selecting the insulation energy efficiency class.
5.3 Designing phase of the operational installation
It is crucial that the space requirements of the selected energy efficiency class are known in an early
design phase.
This standard defines in Step 4 of Table 1 and Table 2, the so-called indicative space requirements for
an insulation system and its selected energy efficiency class, S . The S information gives an orientation
I,X I,X
about how much sp
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...