EN ISO 11855-3:2021

SLOVENSKI STANDARD
01-november-2021
Nadomešča:
SIST EN ISO 11855-3:2015
Načrtovanje notranjega okolja v stavbah - Vgrajeni sevalni ogrevalni in hladilni
sistemi - 3. del: Načrtovanje in dimenzioniranje (ISO 11855-3:2021)
Building environment design - Embedded radiant heating and cooling systems - Part 3:
Design and dimensioning (ISO 11855-3:2021)
Umweltgerechte Gebäudeplanung - Flächenintegrierte Strahlheizungs- und -
kühlsysteme - Teil 3: Planung und Auslegung (ISO 11855-3:2021)
Conception de l'environnement des bâtiments - Systèmes intégrés de chauffage et de
refroidissement par rayonnement - Partie 3: Conception et dimensionnement (ISO 11855
-3:2021)
Ta slovenski standard je istoveten z: EN ISO 11855-3:2021
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11855-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2021
EUROPÄISCHE NORM
ICS 91.040.01 Supersedes EN ISO 11855-3:2015
English Version
Building environment design - Embedded radiant heating
and cooling systems - Part 3: Design and dimensioning
(ISO 11855-3:2021)
Conception de l'environnement des bâtiments - Umweltgerechte Gebäudeplanung - Flächenintegrierte
Systèmes intégrés de chauffage et de refroidissement Strahlheizungs- und -kühlsysteme - Teil 3: Planung und
par rayonnement - Partie 3: Conception et Auslegung (ISO 11855-3:2021)
dimensionnement (ISO 11855-3:2021)
This European Standard was approved by CEN on 29 July 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 ISO 11855-3:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11855-3:2021) has been prepared by Technical Committee ISO/TC 205
"Building environment design" in collaboration with Technical Committee CEN/TC 228 “Heating
systems and water based cooling systems in buildings” the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2022, and conflicting national standards shall
be withdrawn at the latest by March 2022.
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 ISO 11855-3:2015.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN websites.
According to the CEN-CENELEC Internal Regulations, the national standards organizations 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.
Endorsement notice
The text of ISO 11855-3:2021 has been approved by CEN as EN ISO 11855-3:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 11855-3
Second edition
2021-08
Building environment design —
Embedded radiant heating and cooling
systems —
Part 3:
Design and dimensioning
Conception de l'environnement des bâtiments — Systèmes intégrés de
chauffage et de refroidissement par rayonnement —
Partie 3: Conception et dimensionnement
Reference number
ISO 11855-3:2021(E)
©
ISO 2021
ISO 11855-3:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 11855-3:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Radiant panel . 3
5.1 Floor heating systems . 3
5.1.1 Design procedure . 3
5.1.2 Heating medium differential temperature . 4
5.1.3 Characteristic curve . 4
5.1.4 Field of characteristic curves . 4
5.1.5 Limit curves . 4
5.1.6 Downwards thermal insulation . 5
5.1.7 Procedure for determining the design supply temperature of the heating
medium .10
5.1.8 Procedure for determining the design heating medium flow rate .13
5.1.9 Peripheral areas.14
5.2 Ceiling heating systems .14
5.2.1 General.14
5.2.2 Limit curves .14
5.2.3 Procedure for determining the design heating medium flow rate .15
5.3 Wall heating systems .15
5.3.1 General.15
5.3.2 Limit curves .15
5.3.3 Procedure for determining the design heating medium flow rate .15
5.4 Floor cooling systems . .16
5.4.1 Design procedure .16
5.4.2 Cooling medium differential temperature .16
5.4.3 Characteristic curve .17
5.4.4 Field of characteristic curves .17
5.4.5 Limit curves .17
5.4.6 Downwards thermal insulation .17
5.4.7 Procedure for determining the supply design temperature of cooling medium .17
5.4.8 Procedure for determining the design cooling medium flow rate .17
5.5 Ceiling cooling systems .17
5.6 Wall cooling systems .17
Annex A (normative) Thermal insulation for type A and C .18
Bibliography .19
ISO 11855-3:2021(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
...