SIST EN 1264-1:2021
(Main)Water based surface embedded heating and cooling systems - Part 1: Definitions and symbols
Water based surface embedded heating and cooling systems - Part 1: Definitions and symbols
This European Standard is applicable to water based surface embedded heating and cooling systems in residential, office and other buildings, the use of which corresponds to or is similar to that of residential buildings.
This European Standard applies to heating and cooling systems embedded into the enclosure surfaces of the room to be heated or to be cooled.
It also applies as appropriate to the use of other heating media instead of water.
Raumflächenintegrierte Heiz- und Kühlsysteme mit Wasserdurchströmung - Teil 1: Definitionen und Symbole
Die Normenreihe EN 1264 gibt Leitlinien für in Wohn- und anderen Gebäuden (z. B. Bürogebäuden, öffentlichen Gebäuden sowie Gewerbe- und Industriegebäuden) installierte raumflächenintegrierte Heiz- und Kühlsysteme und legt einen Schwerpunkt auf Systeme, die für den Zweck der thermischen Behaglichkeit installiert werden.
Die Normenreihe EN 1264 gibt Leitlinien für Heiz- und Kühlsysteme mit Wasserdurchströmung, die in die Raumumschließungsflächen des zu heizenden oder des zu kühlenden Raumes eingebettet sind. Sie legt ggf. auch die entsprechende Verwendung anderer Heizmittel als Wasser fest.
Die Normenreihe EN 1264 legt die Identifizierung standardisierter Produktmerkmale durch Berechnung und Prüfung der Wärmeleistung der Heizung für technische Spezifikationen und die Zertifizierung fest. Für das Design, den Bau und den Betrieb dieser Anlagen siehe EN 1264 3 und EN 1264 4 für die Typen A, B, C, D, H, I und J. Für die Typen E, F und G siehe Normenreihe EN ISO 11855.
Die in der Normenreihe EN 1264 festgelegten Systeme grenzen an den tragenden Untergrund der Umschließungsflächen des Gebäudes an und werden direkt oder mit Befestigungshalterungen angebracht. Die Normenreihe EN 1264 trifft keine Festlegungen für in abgehängten Decken montierte Deckensysteme mit einem auslegungsgemäßen offenen Luftspalt zwischen dem System und der Gebäudestruktur, der eine thermisch induzierte Umwälzung der Luft erlaubt. Die Wärmeleistung dieser Systeme kann nach der Normenreihe EN 14037 und EN 14240 bestimmt werden.
EN 1264 1 legt Systemtypen und Merkmale von raumflächenintegrierten Strahlheizungs- und kühlsystemen mit Wasserdurchströmung fest.
Systèmes de surfaces chauffantes et rafraîchissantes hydrauliques intégrées - Partie 1: Définitions et symboles
La série EN 1264 fournit des lignes directrices pour les systèmes de surfaces chauffantes et rafraîchissantes intégrées dans les bâtiments résidentiels et non résidentiels (par exemple, des bureaux, des bâtiments publics, commerciaux et industriels), et se concentre sur les systèmes installés à des fins de confort thermique.
La série EN 1264 fournit des lignes directrices pour les systèmes de surfaces chauffantes et rafraîchissantes intégrées dans les parois des pièces à chauffer ou à rafraîchir. Elle spécifie également l'utilisation de fluides caloporteurs autres que l'eau, le cas échéant.
La série EN 1264 spécifie les caractéristiques normalisées des produits en calculant et en mettant à l'essai l'émission thermique du chauffage pour les spécifications techniques et la certification. Pour la conception, la construction et le fonctionnement de ces systèmes, voir l'EN 1264-3 et l'EN 1264-4 pour les types A, B, C, D, H, I et J. Pour les types E, F et G, voir la série EN ISO 11855.
Les systèmes spécifiés dans la série EN 1264 sont fixés directement ou à l'aide de supports de fixation au plancher porteur des parois du bâtiment. La série EN 1264 ne spécifie pas les systèmes de plafond montés dans un plafond suspendu, dont l'entrefer ouvert conçu entre le système et la structure du bâtiment permet la circulation de l'air induite par la chaleur. L'émission thermique de ces systèmes peut être déterminée selon la série EN 14037 et l'EN 14240.
L'EN 1264-1 spécifie les types de systèmes et les caractéristiques des systèmes de surfaces chauffantes et rafraîchissantes hydrauliques intégrées.
Ploskovni sistemi za ogrevanje in hlajenje z vodo - 1. del: Definicije in simboli
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 1264-1:2021
01-julij-2021
Nadomešča:
SIST EN 1264-1:2011
Ploskovni sistemi za ogrevanje in hlajenje z vodo - 1. del: Definicije in simboli
Water based surface embedded heating and cooling systems - Part 1: Definitions and
symbols
Raumflächenintegrierte Heiz- und Kühlsysteme mit Wasserdurchströmung - Teil 1:
Definitionen und Symbole
Systèmes de surfaces chauffantes et rafraîchissantes hydrauliques intégrées - Partie 1:
Définitions et symboles
Ta slovenski standard je istoveten z: EN 1264-1:2021
ICS:
01.040.91 Gradbeni materiali in gradnja Construction materials and
(Slovarji) building (Vocabularies)
01.075 Simboli za znake Character symbols
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 1264-1:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN 1264-1:2021
---------------------- Page: 2 ----------------------
SIST EN 1264-1:2021
EN 1264-1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2021
EUROPÄISCHE NORM
ICS 01.040.91; 01.075; 91.140.10 Supersedes EN 1264-1:2011
English Version
Water based surface embedded heating and cooling
systems - Part 1: Definitions and symbols
Systèmes de surfaces chauffantes et rafraîchissantes Raumflächenintegrierte Heiz- und Kühlsysteme mit
hydrauliques intégrées - Partie 1: Définitions et Wasserdurchströmung - Teil 1: Definitionen und
symboles Symbole
This European Standard was approved by CEN on 12 April 2021.
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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1264-1:2021 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
3.1 System description . 5
3.2 Parameters of design . 6
3.3 Thermal output . 7
3.4 Surface temperatures . 9
3.5 Temperatures of the heating/cooling medium . 10
3.6 Flow rates . 12
3.7 Characteristic curves . 12
4 Symbols and abbreviations . 13
4.1 Symbols . 13
4.2 Abbreviations . 17
Annex A (normative) Types of embedded heating and cooling systems. 18
A.1 General . 18
A.2 Examples of Types . 19
Bibliography . 30
2
---------------------- Page: 4 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
European foreword
This document (EN 1264-1:2021) has been prepared by Technical Committee CEN/TC 130 “Space
heating appliances without integral heat sources”, 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 November 2021, and conflicting national standards
shall be withdrawn at the latest by November 2021.
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.
This document supersedes EN 1264-1:2011.
The main changes compared to the previous edition are listed below:
a) Clarification of Scope;
b) Improved wording;
c) Specification of the definition of embedded heating and cooling systems;
d) Expansion of the types of embedded heating and cooling systems;
e) Deletion, modification and addition of several terms and definitions;
f) Updated references.
EN 1264, Water based surface embedded heating and cooling systems, consists of the following parts:
— Part 1: Definitions and symbols;
— Part 2: Floor heating: Methods for the determination of the thermal output using calculations and
experimental tests;
— Part 3: Dimensioning;
— Part 4: Installation;
— Part 5: Determination of the thermal output for wall and ceiling heating and for floor, wall and ceiling
cooling.
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
---------------------- Page: 5 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
1 Scope
The EN 1264 series gives guidelines for surface embedded heating and cooling systems installed in
buildings, residential and non-residential (e.g. office, public, commercial and industrial buildings) and
focuses on systems installed for the purpose of thermal comfort.
The EN 1264 series gives guidelines for water based heating and cooling systems embedded into the
enclosure surfaces of the room to be heated or to be cooled. It also specifies the use of other heating
media instead of water, as appropriate.
The EN 1264 series specifies standardized product characteristics by calculation and testing the
thermal output of heating for technical specifications and certification. For the design, construction and
operation of these systems, see EN 1264-3 and EN 1264-4 for the types A, B, C, D, H, I and J. For the
types E, F and G, see the EN ISO 11855 series.
The systems specified in the EN 1264 series are adjoined to the structural base of the enclosure
surfaces of the building, mounted directly or with fixing supports. The EN 1264 series does not specify
ceiling systems mounted in a suspended ceiling with a designed open air gap between the system and
the building structure which allows the thermally induced circulation of the air. The thermal output of
these systems can be determined according to the EN 14037 series and EN 14240.
EN 1264-1 specifies system types and characteristics of water based surface embedded radiant heating
and cooling systems.
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 1264-2:2021, Water based surface embedded heating and cooling systems — Part 2: Floor heating:
Methods for the determination of the thermal output using calculations and experimental tests
EN 1264-4:2021, Water based surface embedded heating and cooling systems — Part 4: Installation
EN 1264-5:2021, Water based surface embedded heating and cooling systems — Part 5: Heating and
cooling surfaces embedded in floors, ceilings and walls — Determination of the thermal output
EN ISO 11855 (all parts), Building environment design — Design, dimensioning, installation and control of
embedded radiant heating and cooling systems
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:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4
---------------------- Page: 6 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.1 System description
For the definition of the different system types, see Annex A.
3.1.1
surface embedded heating and cooling system
heating or cooling installation embedded into the enclosure surfaces of the room which is adjoined to
the structural base of the enclosure surfaces of the building, directly mounted or with fixing supports,
without any open air gap consisting of circuits of pipes, circuit distributors, control equipment and
thermal diffusion layers
Note 1 to entry: The system can be embedded in the floor, wall or ceiling.
3.1.2
open air gap
designed air inclusions between the heated or cooled surface and the structural base of the building
which is large enough to enable thermally induced air circulation
Note 1 to entry: The designed open air gap supports the thermal exchange between the system and the room.
Note 2 to entry: Wall and ceiling systems can have air inclusions due to fixing supports, see Figure 1 a). These
are not regarded as open air gaps. These separated inclusions act as a thermal insulation without internal air
circulation.
a) b)
Key
1 structural base
2 insulation layer
3 heating/cooling panel
4 fixing supports
5 open air gap
6 suspension
Figure 1 — Example of a ceiling system without (a) and with (b) an open air gap
3.1.3
circuit
section of pipes connected to circuit distributor which can be independently switched and controlled
3.1.4
circuit distributor
common connection point for several circuits
5
---------------------- Page: 7 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.1.5
thermal diffusion device
component in contact with the pipe having a high thermal conductivity in order to improve the thermal
distribution
3.1.6
thermal diffusion layer
layer for transferring the thermal energy between the pipes and the surface and storing thermal energy
3.1.7
system insulation
insulation with the thermal resistance R to limit the heat loss of heating and cooling systems
λ,ins
Note 1 to entry: According to EN 1264-4:2021, Table 1 and Table 3.
3.1.8
supplementary heating equipment
additional heating facility, e.g. convectors, radiators with the additional required thermal output and
possibly with its own control equipment
3.1.9
emission system
part of the embedded heating and cooling system that carries out the thermal transfer in the room
Note 1 to entry: The thermal transfer can be positive (heating case) or negative (cooling case).
EXAMPLE Embedded radiant heating and cooling system.
3.2 Parameters of design
3.2.1
standard heat load in a floor heated room
Q
N,f
rate of heat loss from the building to the outside and to neighbouring rooms under standardized
conditions, depending on the regional climatic data, the location, its use and the thermal properties of
the building
Note 1 to entry: When calculating the standard heat load, the thermal output from the embedded heating
systems in the neighbouring room is not taken into account.
3.2.2
standard cooling load
Q
C,f
rate of heat input into the building from the external environment and neighbouring rooms under
standardized conditions and depending on the regional climatic data, location, its use and thermal
properties of the building
3.2.3
additional thermal output
Q
out
thermal output of supplementary heating equipment
Note 1 to entry: Q = Q − Q
out N,f F
6
---------------------- Page: 8 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.2.4
heating/cooling surface
A
F
surface area covered by the heating or cooling system, including a perimeter strip
Note 1 to entry: The width of the perimeter strip is generally half of one pipe spacing, but not exceeding 0,15 m.
3.2.5
furniture area
floor surface area not covered by a heating or cooling system, intended for permanent placement of
furnishings forming part of the building
3.2.6
peripheral area
A
R
floor surface heated to a higher temperature and generally an area of 1,0 m maximum in width along
exterior walls
Note 1 to entry: It is not an occupied area.
3.2.7
occupied area
A
A
area within the heated or cooled floor surface occupied for long periods
Note 1 to entry: In case of floor heating, it consists of the heating floor surface less the peripheral area.
3.2.8
standard indoor room temperature
ϑ
i
resultant indoor temperature defined as the average of the dry air temperature and the mean radiant
temperature
Note 1 to entry: The resultant temperature is considered as the relevant for thermal comfort assessment and
heat loss calculations. This internal temperature ϑ is used for the calculation method [5], [6].
i
3.2.9
regional dew point
ϑ
Dp,R
dew point specified depending on the climatic conditions of the region
3.2.10
design dew point
ϑ
Dp,des
dew point determined for the design
3.3 Thermal output
3.3.1
specific thermal output of floor heating systems
q
thermal output of floor heating systems divided by the surface area
7
---------------------- Page: 9 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.3.2
specific thermal output of embedded heating systems
q
H
thermal output of embedded heating systems divided by the surface area
3.3.3
specific thermal output of embedded cooling systems
q
C
thermal output of embedded cooling systems divided by the surface area
3.3.4
limit of specific thermal output of floor heating systems
q
G
specific thermal output at which the permissible maximum floor surface temperature is achieved
Note 1 to entry: In the case of floor heating, this means the maximum surface temperature ϑ within the
F,max
range of temperature distribution.
3.3.5
maximum limit of specific thermal output of floor heating systems
q
G,max
limit of specific thermal output of floor heating systems, calculated in accordance with the Basic
Characteristic Curve due to maximum floor surface temperature ϑ together with isothermal
F,max
surface temperature distribution
3.3.6
standard thermal output of floor heating systems
q
N
limit of specific thermal output of floor heating systems achieved without floor covering
3.3.7
standard specific thermal output of embedded heating systems
q
H,N
specific thermal output of embedded heating systems achieved with standard temperature difference
between heating medium and room
Note 1 to entry: For heating systems (other than floor heating), Δϑ = 10 K is valid.
H,N
3.3.8
standard specific thermal output of embedded cooling systems
q
C,N
specific thermal output of embedded cooling systems achieved with standard temperature difference
between room and cooling medium
Note 1 to entry: For cooling systems, Δϑ = 8 K is valid.
C,N
3.3.9
design specific thermal output of floor heating systems
q
des
amount due to the room, calculated with the standard heat load, divided by the heating floor surface
area
8
---------------------- Page: 10 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.3.10
maximum specific thermal output
q
max
highest q within q of specific thermal output in circuits operated at the same design flow
des G
temperature
3.3.11
downward specific heat loss of floor heating systems
q
u
specific thermal output throughout the floor construction, to rooms below, the ground or unheated
spaces
3.3.12
design thermal output of floor heating systems
Q
F
sum of thermal output based on output of each area in relation to the total room floor area
3.3.13
design specific cooling load
q
C,Ld,des
standard cooling load divided by the cooling surface
3.3.14
design specific thermal output of cooling systems
q
C,des
specific thermal output achieved with design average temperature difference between room and
cooling medium
3.4 Surface temperatures
3.4.1
maximum floor surface temperature
ϑ
F,max
maximum temperature permissible for physiological reasons, for calculation of the limit curves, which
may occur at a point on the floor in the occupied or peripheral area
Note 1 to entry: ϑ limits the thermal output. In this case the highest point surface temperature on the floor
F,max
need to be taken.
3.4.2
average surface temperature
ϑ
F,m
average temperature of the activated surface area for each circuit
3.4.3
average temperature difference between surface and room
difference ϑ − ϑ between the average temperature of the heating or cooling surface and the standard
F,m i
indoor room temperature
Note 1 to entry: This determines the specific thermal output for heating and cooling.
9
---------------------- Page: 11 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.5 Temperatures of the heating/cooling medium
In this standard series, the denotations medium and water are used as synonym.
3.5.1
temperature difference between heating medium and room
Δϑ
H
average difference between the temperatures of the heating medium and the standard indoor room
temperature determined in a logarithmic equation
Note 1 to entry: See EN 1264-2:2021, Formula (1).
3.5.2
limit temperature difference between heating medium and room
Δϑ
H,G
temperature difference between heating medium and room at which the permissible maximum floor
surface temperature is achieved
Note 1 to entry: Δϑ is determined by the specific thermal output q , see EN 1264-2:2021, Formula (21).
H,G G
3.5.3
standard temperature difference between heating medium and room for floor heating systems
Δϑ
N
limit temperature difference Δϑ between heating medium and room floor heating systems without
H,G
floor covering
Note 1 to entry: Δϑ is determined by the standard specific thermal output q .
N N
3.5.4
standard temperature difference between heating medium and room for heating systems with
the exception of floor heating
Δϑ
H,N
standard value set at 10 K
3.5.5
design temperature difference between heating medium and room of floor heating systems
Δϑ
H,des
temperature difference between heating medium and room taking into account the thermal resistance
of the chosen floor covering, at q
max
3.5.6
heating circuit design temperature difference between heating medium and room of floor
heating systems
Δϑ
H,j
temperature difference between heating medium and room with the thermal resistance of the chosen
floor covering, at a required specific thermal output q which is less than the maximum specific thermal
j
output q
max
10
---------------------- Page: 12 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.5.7
design temperature difference between flow of heating medium and room of floor heating
systems
Δϑ
V,des
temperature difference between flow of heating medium and room with the thermal resistance of the
chosen floor covering, at maximum specific thermal output q
max
3.5.8
design flow temperature of floor heating systems
ϑ
V,des
flow water temperature with the thermal resistance of the chosen floor covering, at maximum specific
thermal output q
max
Note 1 to entry: The flow temperature and the supply temperature are the same throughout the series EN 1264.
3.5.9
average temperature of heating medium
ϑ
H
calculated temperature deduced from the standard room temperature plus the temperature difference
between heating medium and room
3.5.10
temperature drop of heating medium
σ
difference between the flow and return temperatures of the medium
Note 1 to entry: The denotation σ is also used for the design value in case of q .
max
3.5.11
heating circuit design temperature drop of heating medium
σ
j
temperature drop of heating medium at a required specific thermal output q which is less than the
j
maximum specific thermal output q
max
3.5.12
temperature difference between room and cooling medium for cooling systems
Δϑ
C
average difference between the standard indoor room temperature and the cooling medium
temperature, determined in a logarithmic equation
Note 1 to entry: See EN 1264-3:2021, Formula (16).
3.5.13
standard temperature difference between room and cooling medium for cooling systems
Δϑ
C,N
standard value set at 8 K
3.5.14
inlet (flow) water temperature of cooling systems
ϑ
C,in
inlet (flow) temperature of cooling water in a cooling circuit
11
---------------------- Page: 13 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.5.15
design inlet (flow) water temperature of cooling systems
ϑ
C,in,des
permissible inlet (flow) temperature of cooling water, depending on design dew point
3.5.16
outlet (return) water temperature of cooling systems
ϑ
C,out
outlet (return) temperature of cooling water in a cooling circuit
3.5.17
design temperature difference between room and cooling medium
Δϑ
C,des
permissible average difference between room and cooling medium depending on permissible design
flow temperature and temperature rise of cooling medium
3.5.18
average temperature of cooling medium
ϑ
C
arithmetic mean of inlet (flow) and outlet (return) water temperature
3.5.19
temperature rise of cooling medium
σ
C
difference between outlet (return) and inlet (flow) temperature of the medium in a circuit
Note 1 to entry: The denotation σ is also used for the design value.
C
3.6 Flow rates
3.6.1
design heating water flow rate
m
H
mass flow rate in a heating circuit which is required to achieve the design specific thermal output
3.6.2
design cooling water flow rate
m
C
mass flow rate in a cooling circuit which is required to achieve the design specific thermal output
3.7 Characteristic curves
3.7.1
basic characteristic curve
curve displaying the relationship between the specific thermal output q and the average temperature
difference between the surface and the room (ϑ − ϑ ), and is applicable to all hot water floor heating
F,m i
systems
12
---------------------- Page: 14 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.7.2
field of characteristic curves
curves displaying the system-specific relationship between the specific thermal output and the required
temperature difference Δϑ for heating systems or Δϑ for cooling systems, for thermal resistance of
H C
various surface coverings
3.7.3
limit curves
curves representing the maximum heat output limits q and the temperature difference between the
G
heating medium and the room Δϑ for various floor surface coverings
H,G
4 Symbols and abbreviations
4.1 Symbols
The symbols of Table 1 are used in all parts of EN 1264.
Table 1 — Symbols used in all parts of EN 1264
Symbol Unit Quantity
2
A surface area of the occupied area
m
A
2
A surface area of the heating/cooling area
m
F
2
A
surface area of the peripheral area
m
R
a – parameters (calculated or taken from tables) for the calculation of
i
characteristic curves and depending on floor construction, i = B, D,
k, T, u, WL
2
B, B system-dependent coefficients for calculation of characteristic
W/(m ∙K)
0
curves
2
B system-dependent coefficient for calculation of limit curves
W/(m ∙K)
G
b – calculated factor for type B systems depending on the pipe spacing
u
c kJ/(kg∙K) specific heat capacity of water
W
D m external diameter of the pipe, including sheathing where
applicable
d m pipe external diameter
a
d m pipe internal diameter
i
d m external diameter of sheathing
M
f – factor to calculate limit curves for type A and type C systems,
G
depending on parameter s /T
u
2
K
equivalent heat transmission coefficient represented by the
W/(m ∙K)
H
gradient of characteristic curve
K – parameter of thermal diffusion devices for type B systems
WL
L m width of thermal diffusion devices
13
---------------------- Page: 15 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
Symbol Unit Quantity
m kg/s design heating medium flow rate
H
m – exponents for calculation of characteristic curves, i = D, T, u
i
n – exponent for the temperature difference of a characteristic curve
n – exponent for the temperature difference of a limit curve
G
Q W standard cooling load
C,f
Q
W design thermal output of floor heating systems
F
Q W standard heat load of a floor heated room
N,f
Q W additional required thermal output
out
2
q specific thermal output of floor heating systems
W/m
2
q specific thermal output of the occupied area
W/m
A
2
q specific thermal output of embedded cooling systems
W/m
C
2
q designed specific cooling load
W/m
C,Ld,des
2
q standard specific thermal output of embedded cooling systems
W/m
C,N
2
q design specific thermal output of floor heating systems
W/m
des
2
q limit of specific thermal output
W/m
G
2
q result for q in the case of R = 0,15, for proving of
W/m
G,M,s(Rλ;B = 0,15) G λ;B
reproducibility precision
2
q maximum limit of specific thermal output of floor heating systems
W/m
G,max
2
q specific thermal output of embedded heating systems, excluding
W/m
H
floor heating
2
q standard specific thermal output of embedded heating systems,
W/m
H,N
excluding floor heating
2
q specific thermal output in rooms with q < q , operated at the
W/m
j max
same ϑ
V,des
2
q highest specific thermal output in circuits operated with the same
W/m
max
ϑ
V,des
2
q standard thermal output of floor heating systems
W/m
N
2
q result for q , for proving of reproducibility precision
W/m
N,M,s N
2
q
specific thermal output of the peripheral area
W/m
R
2
q downward specific heat loss of floor heating systems
W/m
u
2
R thermal resistance of the heat flow meter plate
m ∙K/W
HFM
14
---------------------- Page: 16 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
Symbol Unit Quantity
2
R upwards partial thermal transmission resistance of the floor
m ∙K/W
o
structure
2
R downwards partial thermal transmission resistance of the floor
m ∙K/W
u
structure
2
R thermal transfer resistance on the heating surface
m ∙K/W
α
2
R thermal transfer resistance on the surface of the back side of a wall
m ∙K/W
α,back
2
R
thermal transfer resistance on the floor above the ceiling heated
m ∙K/W
α,floor
room
2
R thermal transfer resistance on the ceiling under the floor heated
m ∙K/W
α,ceiling
room
2
R thermal resistance of floor covering
m ∙K/W
λ,B
effective thermal resistance of carped covering
2
R result for effective thermal resistance of carped covering, for
m ∙K/W
λ,B,M,s
proving of reproducibility precision
2
R thermal resistance of the ceiling construction below insulation
m ∙K/W
λ,ceiling
layer
2
R thermal resistance of thermal insulation
m ∙K/W
λ,ins
2
R
thermal resistance of plaster
m ∙K/W
λ,plaster
2
ΔR additional thermal transfer resistance compared with floor heating
m ∙K/W
α
s m in type B systems, the overall thickness of thermal insulation (see
h
EN 1264-3:2021, Figure A.3)
s m in type B s
...
SLOVENSKI STANDARD
oSIST prEN 1264-1:2020
01-januar-2020
Ploskovni sistemi za ogrevanje in hlajenje z vodo - 1. del: Definicije in simboli
Water based surface embedded heating and cooling systems - Part 1: Definitions and
symbols
Raumflächenintegrierte Heiz- und Kühlsysteme mit Wasserdurchströmung - Teil 1:
Definitionen und Symbole
Systèmes de surfaces chauffantes et rafraîchissantes hydrauliques intégrées - Partie 1:
Définitions et symboles
Ta slovenski standard je istoveten z: prEN 1264-1
ICS:
01.040.91 Gradbeni materiali in gradnja Construction materials and
(Slovarji) building (Vocabularies)
01.075 Simboli za znake Character symbols
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
oSIST prEN 1264-1:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN 1264-1:2020
---------------------- Page: 2 ----------------------
oSIST prEN 1264-1:2020
DRAFT
EUROPEAN STANDARD
prEN 1264-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2020
ICS 01.040.91; 01.075; 91.140.10 Will supersede EN 1264-1:2011
English Version
Water based surface embedded heating and cooling
systems - Part 1: Definitions and symbols
Systèmes de surfaces chauffantes et rafraîchissantes Raumflächenintegrierte Heiz- und Kühlsysteme mit
hydrauliques intégrées - Partie 1: Définitions et Wasserdurchströmung - Teil 1: Definitionen und
symboles Symbole
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 130.
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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1264-1:2020 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Symbols . 13
Annex A (normative) Types of embedded heating and cooling systems. 18
A.1 General . 18
A.2 Examples of Types . 19
Bibliography . 28
2
---------------------- Page: 4 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
European foreword
This document (prEN 1264-1:2020) has been prepared by Technical Committee CEN/TC 130 “Space
heating appliances without integral heat sources”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1264-1:2011.
This document, Water based surface embedded heating and cooling systems, consists of the following
parts:
— Part 1: Definitions and symbols;
— Part 2: Floor heating: Methods for the determination of the thermal output using calculations and
experimental tests;
— Part 3: Dimensioning;
— Part 4: Installation;
— Part 5: Determination of the thermal output for wall and ceiling heating and for floor, wall and ceiling
cooling.
The main changes with respect to the previous edition are listed below:
a) Clarified the scope;
b) Improved wording, especially the term “prove method”;
c) Specified the definition of embedded heating and cooling systems;
d) Expanded the types of embedded heating and cooling systems;
e) Deleted, modified and added of several terms and definitions;
f) Updated references.
3
---------------------- Page: 5 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
1 Scope
EN 1264 covers surface embedded heating and cooling systems installed in buildings, residential and
non-residential (e.g. office, public, commercial and industrial buildings) and focuses on systems
installed for the purpose of thermal comfort.
EN 1264 applies to water based heating and cooling systems embedded into the enclosure surfaces of
the room to be heated or to be cooled. It also applies as appropriate to the use of other heating media
instead of water.
EN 1264 applies to identify standardized product characteristics by calculation and testing the thermal
output of heating for technical specifications and certification. For the design, construction and
operation of these systems, EN ISO 11855 applies.
The systems covered in EN 1264 are adjoined to the structural base of the enclosure surfaces of the
building, mounted directly or with fixing supports. It does not cover ceiling systems mounted in a
suspended ceiling with a designed open air gap between the system and the building structure which
allows the thermally induced circulation of the air. The thermal output of these systems can be
determined according to ISO 18566, EN 14037 and EN 14240.
EN 1264-1 describes system types and characteristics of water based surface embedded radiant heating
and cooling systems.
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 1264-2, Water based surface embedded heating and cooling systems — Part 2: Floor heating: Methods
for the determination of the thermal output using calculations and experimental tests
prEN 1264-4:2019, Water based surface embedded heating and cooling systems — Part 4: Installation
EN ISO 11855, Building environment design — Design, dimensioning, installation and control of
embedded radiant heating and cooling systems
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:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
Surface embedded heating and cooling system
Note1 to entry For the definition of the different system types, see Annex A.
3.1.1
surface embedded heating and cooling system
heating or cooling installation embedded into the enclosure surfaces of the room which is adjoined to
the structural base of the enclosure surfaces of the building, directly mounted or with fixing supports,
without any open air gap consisting of circuits of pipes, circuit distributors, and control equipment
Note 1 to entry: The system can be embedded in the floor, wall or ceiling.
4
---------------------- Page: 6 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
3.1.2
open air gap
designed air inclusions between the heated or cooled surface and the structural base of the building
which is large enough to enable thermally induced air circulation
Note 1 to entry: The designed open air gap supports the thermal exchange between the system and the room
Note 2 to entry: Wall and ceiling systems can have air inclusions due to fixing supports, see Figure 1. These are
not regarded as open air gaps when the separated inclusions act as a thermal insulation without internal air
circulation.
Key
1 structural base / ceiling
2 insulation layer
3 heating/cooling panel
4 fixing supports
5 open air gap
Figure 1 — Open air gap
3.1.3
circuit
section of pipes connected to circuit distributor which can be independently switched and controlled
3.1.4
circuit distributor
common connection point for several circuits
3.1.5
thermal diffusion device
component in contact with the pipe having a high thermal conductivity in order to improve the thermal
distribution
3.1.6
thermal diffusion layer
layer for transferring the thermal energy between the pipes and the surface and storing thermal energy
3.1.7
system insulation
insulation with the thermal resistance R to limit the heat loss of heating and cooling systems
λ,ins
Note 1 to entry: According to prEN 1264 4:2019, Table 1 and Table 3
3.1.8
interior walls
partitions of rooms within dwellings or similar used room groups
5
---------------------- Page: 7 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
3.2
supplementary heating equipment
additional heating facility, e.g. convectors, radiators with the additional required thermal output and
possibly with its own control equipment
3.3
Parameters of design
3.3.1
standard heat load in a floor heated room
Q
N,f
rate of heat loss from the building to the outside and to neighbouring rooms under standardized
conditions, depending on the regional climatic data, the location, its use and the thermal properties of
the building
Note 1 to entry: When calculating the standard heat load, the thermal output from the embedded heating
systems in the neighbouring room is not taken into account.
3.3.2
standard cooling load
Q
C,f
rate of heat input into the building from the external environment and neighbouring rooms under
standardized conditions and depending on the regional climatic data, location, its use and thermal
properties of the building
3.3.3
additional thermal output
Q
out
thermal output of supplementary heating equipment
Note 1 to entry: Q = Q − Q
out N,f F
3.3.4
heating/cooling surface
A
F
area of surface covered by the heating or cooling system, including a perimeter strip whose width
should be half of one spacing, but not exceeding 0,150 m
3.3.5
furniture area
area of the floor surface not covered by a heating or cooling system, intended for permanent placement
of furnishings forming part of the building
3.3.6
peripheral area
A
R
floor surface heated to a higher temperature and generally an area of 1,0 m maximum in width along
exterior walls.
Note 1 to entry: It is not an occupied area.
6
---------------------- Page: 8 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
3.3.7
occupied area
A
A
area within the heated or cooled floor surface occupied for long periods
Note 1 to entry: In case of floor heating, it consists of the heating floor surface less the peripheral area.
3.3.8
standard indoor room temperature
ϑ
i
resultant indoor temperature defined as the average of the dry air temperature and the mean radiant
temperature
Note 1 to entry: The resultant temperature is considered as the relevant for thermal comfort assessment and
heat loss calculations. This value of internal temperature ϑ is used for the calculation method [1], [2].
i
3.3.9
regional dew point
ϑ
Dp,R
dew point specified depending on the climatic conditions of the region
3.3.10
design dew point
ϑ
Dp,des
dew point determined for the design
3.4
Thermal output
3.4.1
specific thermal output of floor heating systems
q
thermal output of floor heating systems divided by the surface area
3.4.2
specific thermal output of embedded heating systems
q
H
thermal output of embedded heating systems divided by the surface area
Note 1 to entry: For floor heating, index H is not used.
3.4.3
specific thermal output of embedded cooling systems
q
C
thermal output of embedded cooling systems divided by the surface area
3.4.4
limit of specific thermal output of floor heating systems
q
G
specific thermal output at which the permissible maximum floor surface temperature is achieved
7
---------------------- Page: 9 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
Note 1 to entry: In the case of floor heating, this means the maximum value of surface temperature ϑ
F,max
within the range of temperature distribution.
3.4.5
maximum limit of specific thermal output of floor heating systems
q
G,max
limit of specific thermal output of floor heating systems, calculated in accordance with the Basic
Characteristic Curve due to maximum floor surface temperature ϑ together with isothermal
F,max
surface temperature distribution
3.4.6
standard thermal output of floor heating systems
q
N
limit of specific thermal output of floor heating systems achieved without floor covering
3.4.7
standard specific thermal output of embedded heating systems
q
H,N
specific thermal output of embedded heating systems achieved with standard temperature difference
between heating medium and room
Note 1 to entry: For heating systems (other than floor heating), Δϑ = 10 K is valid.
H,N
3.4.8
standard specific thermal output of embedded cooling systems
q
C,N
specific thermal output of embedded cooling systems achieved with standard temperature difference
between room and cooling medium
Note 1 to entry: For cooling systems, Δϑ = 8 K is valid.
C,N
3.4.9
design value of specific thermal output of floor heating systems
q
des
amount due to the room, calculated with the standard heat load, divided by the heating floor surface
area
3.4.10
maximum value of specific thermal output
q
max
highest design value q within q of specific thermal output in circuits operated at the same design
des G
flow temperature
3.4.11
downward specific heat loss of floor heating systems
q
u
specific thermal output throughout the floor construction, to rooms beyond, the ground or cold void
8
---------------------- Page: 10 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
3.4.12
design thermal output of floor heating systems
Q
F
sum of thermal output based on output of each area in relation to the total room floor area
3.4.13
design value of specific cooling load
q
C,Ld,des
standard cooling load divided by the cooling surface
3.4.14
design specific thermal output of cooling systems
q
C,des
value of specific thermal output achieved with design value of average temperature difference between
room and cooling medium
3.5
Surface temperatures
3.5.1
maximum floor surface temperature
ϑ
F,max
maximum temperature permissible for physiological reasons, for calculation of the limit curves, which
may occur at a point on the floor in the occupied or peripheral area
Note 1 to entry: ϑ limits the thermal output. In this case the highest point surface temperature on the
F,max
floor need to be taken.
3.5.2
average surface temperature
ϑ
F,m
average temperature of the activated surface area for each circuit
3.5.3
average temperature difference between surface and room
difference ϑ − ϑ between the average temperature of the heating or cooling surface and the
F,m i
standard indoor room temperature
Note 1 to entry: This determines the specific thermal output for heating and cooling.
3.6
Temperatures of the heating/cooling medium
NOTE In this standard series, the denotations medium and water are used as synonym.
3.6.1
temperature difference between heating medium and room
Δϑ
H
average difference between the temperatures of the heating medium and the standard indoor room
temperature determined in a logarithmic equation
9
---------------------- Page: 11 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
Note 1 to entry: See prEN 1264-2:2019, Formula (1).
3.6.2
limit value of temperature difference between heating medium and room
Δϑ
H,G
temperature difference between heating medium and room at which the permissible maximum floor
surface temperature is achieved
Note 1 to entry: Δϑ is determined by the specific thermal output q , see prEN 1264-2:2019, Formula (20).
H,G G
3.6.3
standard temperature difference between heating medium and room for floor heating systems
Δϑ
N
limit value of temperature difference Δϑ between heating medium and room floor heating systems
H,G
without floor covering
Note 1 to entry: Δϑ is determined by the standard specific thermal output q .
N N
3.6.4
standard temperature difference between heating medium and room for heating systems with
the exception of floor heating
Δϑ
H,N
standard value set at 10 K
3.6.5
design temperature difference between heating medium and room of floor heating systems
Δϑ
H,des
value of temperature difference between heating medium and room taking into account the thermal
resistance of the chosen floor covering, at q
max
3.6.6
heating circuit design temperature difference between heating medium and room of floor
heating systems
Δϑ
H,j
value of temperature difference between heating medium and room with the thermal resistance of the
chosen floor covering, at a required value of specific thermal output q which is less than maximum
j
value of specific thermal output q
max
3.6.7
design temperature difference between flow of heating medium and room of floor heating
systems
Δϑ
V,des
value of temperature difference between flow of heating medium and room with the thermal resistance
of the chosen floor covering, at maximum value of specific thermal output q
max
3.6.8
design flow temperature of floor heating systems
ϑ
V,des
value of flow water temperature with the thermal resistance of the chosen floor covering, at maximum
value of specific thermal output q
max
10
---------------------- Page: 12 ----------------------
oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
Note 1 to entry: The flow temperature and the supply temperature are the same throughout the standard series
EN 1264.
3.6.9
average temperature of heating medium
ϑ
H
calculated temperature deduced from the standard room temperature plus the temperature difference
between heating medium and room
3.6.10
temperature drop of heating medium
σ
difference between the flow and return temperatures of the medium
Note 1 to entry: The denotation σ also is used for design value in case of q .
max
3.6.11
heating circuit design temperature drop of heating medium
σ
j
value of temperature drop of heating medium at a required value of specific thermal output q which is
j
less than maximum value of specific thermal output q
max
3.6.12
temperature difference between room and cooling medium for cooling systems
Δϑ
C
average difference between the standard indoor room temperature and the cooling medium
temperature, determined in a logarithmic equation
Note 1 to entry: See prEN 1264-3:2019, Formula (16).
3.6.13
standard temperature difference between room and cooling medium for cooling systems
Δϑ
C,N
standard value set at 8 K
3.6.14
inlet (flow) water temperature of cooling systems
ϑ
C,in
inlet (flow) temperature of cooling water in a cooling circuit
3.6.15
design inlet (flow) water temperature of cooling systems
ϑ
C,in,des
permissible inlet (flow) temperature of cooling water, depending on design dew point
3.6.16
outlet (return) water temperature of cooling systems
ϑ
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.