EN 1264-1:2021

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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.

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

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.
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/
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
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
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
flo
...