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

Status
Published
Public Enquiry End Date
02-Feb-2020
Publication Date
14-Jun-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Jun-2021
Due Date
12-Aug-2021
Completion Date
15-Jun-2021

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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.
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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

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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.
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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/
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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
---------------------- 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
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
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
out
thermal output of supplementary heating equipment
Note 1 to entry: Q = Q − Q
out N,f F
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SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.2.4
heating/cooling surface

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

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
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

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].

3.2.9
regional dew point
Dp,R
dew point specified depending on the climatic conditions of the region
3.2.10
design dew point
Dp,des
dew point determined for the design
3.3 Thermal output
3.3.1
specific thermal output of floor heating systems
thermal output of floor heating systems divided by the surface area
---------------------- Page: 9 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.3.2
specific thermal output of embedded heating systems
thermal output of embedded heating systems divided by the surface area
3.3.3
specific thermal output of embedded cooling systems
thermal output of embedded cooling systems divided by the surface area
3.3.4
limit of specific thermal output of floor heating systems

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
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

limit of specific thermal output of floor heating systems achieved without floor covering

3.3.7
standard specific thermal output of embedded heating systems
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
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
des

amount due to the room, calculated with the standard heat load, divided by the heating floor surface

area
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SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.3.10
maximum specific thermal output
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

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

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
C,Ld,des
standard cooling load divided by the cooling surface
3.3.14
design specific thermal output of cooling systems
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
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
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.

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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

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
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

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
H,N
standard value set at 10 K
3.5.5

design temperature difference between heating medium and room of floor heating systems

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
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

output q
max
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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
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
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

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
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

temperature drop of heating medium at a required specific thermal output q which is less than the

maximum specific thermal output q
max
3.5.12
temperature difference between room and cooling medium for cooling systems

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

C,N
standard value set at 8 K
3.5.14
inlet (flow) water temperature of cooling systems
C,in
inlet (flow) temperature of cooling water in a cooling circuit
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SIST EN 1264-1:2021
EN 1264-1:2021 (E)
3.5.15
design inlet (flow) water temperature of cooling systems
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
C,out
outlet (return) temperature of cooling water in a cooling circuit
3.5.17
design temperature difference between room and cooling medium
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
arithmetic mean of inlet (flow) and outlet (return) water temperature
3.5.19
temperature rise of cooling medium

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.
3.6 Flow rates
3.6.1
design heating water flow rate

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

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
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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

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
A surface area of the occupied area
A surface area of the heating/cooling area
surface area of the peripheral area
a – parameters (calculated or taken from tables) for the calculation of
characteristic curves and depending on floor construction, i = B, D,
k, T, u, WL
B, B system-dependent coefficients for calculation of characteristic
W/(m ∙K)
curves
B system-dependent coefficient for calculation of limit curves
W/(m ∙K)
b – calculated factor for type B systems depending on the pipe spacing
c kJ/(kg∙K) specific heat capacity of water
D m external diameter of the pipe, including sheathing where
applicable
d m pipe external diameter
d m pipe internal diameter
d m external diameter of sheathing
f – factor to calculate limit curves for type A and type C systems,
depending on parameter s /T
equivalent heat transmission coefficient represented by the
W/(m ∙K)
gradient of characteristic curve
K – parameter of thermal diffusion devices for type B systems
L m width of thermal diffusion devices
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SIST EN 1264-1:2021
EN 1264-1:2021 (E)
Symbol Unit Quantity
m kg/s design heating medium flow rate
m – exponents for calculation of characteristic curves, i = D, T, u
n – exponent for the temperature difference of a characteristic curve
n – exponent for the temperature difference of a limit curve
Q W standard cooling load
C,f
W design thermal output of floor heating systems
Q W standard heat load of a floor heated room
N,f
Q W additional required thermal output
out
q specific thermal output of floor heating systems
W/m
q specific thermal output of the occupied area
W/m
q specific thermal output of embedded cooling systems
W/m
q designed specific cooling load
W/m
C,Ld,des
q standard specific thermal output of embedded cooling systems
W/m
C,N
q design specific thermal output of floor heating systems
W/m
des
q limit of specific thermal output
W/m
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
q maximum limit of specific thermal output of floor heating systems
W/m
G,max
q specific thermal output of embedded heating systems, excluding
W/m
floor heating
q standard specific thermal output of embedded heating systems,
W/m
H,N
excluding floor heating
q specific thermal output in rooms with q < q , operated at the
W/m
j max
same ϑ
V,des
q highest specific thermal output in circuits operated with the same
W/m
max
V,des
q standard thermal output of floor heating systems
W/m
q result for q , for proving of reproducibility precision
W/m
N,M,s N
specific thermal output of the peripheral area
W/m
q downward specific heat loss of floor heating systems
W/m
R thermal resistance of the heat flow meter plate
m ∙K/W
HFM
---------------------- Page: 16 ----------------------
SIST EN 1264-1:2021
EN 1264-1:2021 (E)
Symbol Unit Quantity
R upwards partial thermal transmission resistance of the floor
m ∙K/W
structure
R downwards partial thermal transmission resistance of the floor
m ∙K/W
structure
R thermal transfer resistance on the heating surface
m ∙K/W
R thermal transfer resistance on the surface of the back side of a wall
m ∙K/W
α,back
thermal transfer resistance on the floor above the ceiling heated
m ∙K/W
α,floor
room
R thermal transfer resistance on the ceiling under the floor heated
m ∙K/W
α,ceiling
room
R thermal resistance of floor covering
m ∙K/W
λ,B
effective thermal resistance of carped covering
R result for effective thermal resistance of carped covering, for
m ∙K/W
λ,B,M,s
proving of reproducibility precision
R thermal resistance of the ceiling construction below insulation
m ∙K/W
λ,ceiling
layer
R thermal resistance of thermal insulation
m ∙K/W
λ,ins
thermal resistance of plaster
m ∙K/W
λ,plaster
ΔR additional thermal transfer resistance compared with floor heating
m ∙K/W
s m in type B systems, the overall thickness of thermal insulation (see
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.

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oSIST prEN 1264-1:2020
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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

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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.
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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.
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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
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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
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
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
out
thermal output of supplementary heating equipment
Note 1 to entry: Q = Q − Q
out N,f F
3.3.4
heating/cooling surface

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

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.
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oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
3.3.7
occupied area
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

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].

3.3.9
regional dew point
Dp,R
dew point specified depending on the climatic conditions of the region
3.3.10
design dew point
Dp,des
dew point determined for the design
3.4
Thermal output
3.4.1
specific thermal output of floor heating systems
thermal output of floor heating systems divided by the surface area
3.4.2
specific thermal output of embedded heating systems
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
thermal output of embedded cooling systems divided by the surface area
3.4.4
limit of specific thermal output of floor heating systems

specific thermal output at which the permissible maximum floor surface temperature is achieved

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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
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

limit of specific thermal output of floor heating systems achieved without floor covering

3.4.7
standard specific thermal output of embedded heating systems
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
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
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
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

specific thermal output throughout the floor construction, to rooms beyond, the ground or cold void

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oSIST prEN 1264-1:2020
prEN 1264-1:2020 (E)
3.4.12
design thermal output of floor heating systems

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
C,Ld,des
standard cooling load divided by the cooling surface
3.4.14
design specific thermal output of cooling systems
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
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
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

average difference between the temperatures of the heating medium and the standard indoor room

temperature determined in a logarithmic equation
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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
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

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
H,N
standard value set at 10 K
3.6.5

design temperature difference between heating medium and room of floor heating systems

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
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

value of specific thermal output q
max
3.6.7

design temperature difference between flow of heating medium and room of floor heating

systems
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
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
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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

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
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

value of temperature drop of heating medium at a required value of specific thermal output q which is

less than maximum value of specific thermal output q
max
3.6.12
temperature difference between room and cooling medium for cooling systems

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

C,N
standard value set at 8 K
3.6.14
inlet (flow) water temperature of cooling systems
C,in
inlet (flow) temperature of cooling water in a cooling circuit
3.6.15
design inlet (flow) water temperature of cooling systems
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
...

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