EN ISO 11855-8:2023

Building environment design - Design, dimensioning, installation and control of embedded radiant heating and cooling systems - Part 8: Electrical heating systems (ISO 11855-8:2023)

This document specifies procedures and conditions to enable the heat flux in electrical surface heating systems to be determined relative to the medium differential temperature for systems. The determination of thermal performance electrical surface heating systems and their conformity to this document is carried out by calculation in accordance with design documents and a model. This enables a uniform assessment and calculation surface heating systems.
The surface temperature and the temperature uniformity of the heated surface, nominal heat flux density between electrical heated layer and space are given as the result.
The ISO 11855 series is applicable to water based embedded surface heating and cooling systems in residential, commercial and industrial buildings[1]. The methods apply to systems integrated into the wall, floor or ceiling construction without any open-air gaps. It does not apply to ceiling mounted panel systems with open air gaps which are not integrated into the building structure.
The ISO 11855 series also applies, as appropriate, to the use of fluids other than water as a heating or cooling medium. The ISO 11855 series is not applicable for testing of systems. The methods do not apply to heated or chilled ceiling panels or beams.
[1]  ISO 11855-7 can also be used for electrical heated embedded systems.

Umweltgerechte Gebäudeplanung - Planung, Auslegung, Installation und Steuerung flächenintegrierter Strahlheizungs- und -kühlsysteme - Teil 8: Elektrische Heizsysteme (ISO 11855-8:2023)

Dieses Dokument legt Verfahren und Bedingungen fest, welche die Bestimmung der Wärmestromdichte von elektrischen Flächenheizsystemen anhand der Temperaturdifferenz des Mediums für diese Systeme ermög
lichen. Die Bestimmung der thermischen Leistung von elektrischen Flächenheizsystemen und ihrer
stimmung mit diesem Dokument wird durch Berechnung nach den Planungsdokumenten und einem Modell vorgenommen. Dies ermöglicht eine einheitliche Bewertung und Berechnung von Flächenheizsystemen.
Als Ergebnis erhält man die Oberflächentemperatur, die Temperaturgleichmäßigkeit der beheizten Oberfläche sowie die Nenn-Wärmestromdichte zwischen der elektrisch beheizten Schicht und dem Raum.
Die NormenreiheISO11855 gilt für integrierte Flächenheiz- und -kühlsysteme mit Wasserdurchströmung in Wohn-, Gewerbe- und Industriegebäuden
1. Die Verfahren gelten für in Wände, Böden und Deckenkonstruktio
nen flächenintegrierte Systeme ohne offene Luftspalte. Sie gelten nicht für an der Decke montierte
teme mit offenen Luftspalten, die nicht in die Gebäudekonstruktion integriert sind.
Die NormenreiheISO11855 gilt gegebenenfalls auch für die Verwendung von anderen Flüssigkeiten als Wasser als Heiz- oder Kühlmedium. Die Prüfung von Systemen ist in der NormenreiheISO11855 nicht erfasst. Die beschriebenen Verfahren gelten nicht für beheizte oder gekühlte Deckenpaneele oder Träger und Balken.

Conception de l'environnement des bâtiments - Conception, dimensionnement, installation et contrôle des systèmes intégrés de chauffage et de refroidissement par rayonnement - Partie 8: Systèmes de chauffage électrique (ISO 11855-8:2023)

Le présent document spécifie des modes opératoires et des conditions permettant de déterminer le flux thermique au sein de systèmes de chauffage électrique de surface par rapport à la température nominale du medium des systèmes. La détermination des performances thermiques des systèmes de chauffage électrique de surface et leur conformité au présent document sont déterminées grâce à des calculs réalisés conformément aux documents de conception et à un modèle. Cela permet une évaluation et des calculs uniformes concernant les systèmes de chauffage de surface.
Il en résulte la température des surfaces et l’uniformité de la température de la surface chauffée ainsi que la densité nominale de flux thermique entre la couche chauffée électriquement et les locaux.
La série ISO 11855 s’applique aux systèmes intégrés de chauffage et de refroidissement de surface à eau dans les bâtiments résidentiels, commerciaux et industriels[1]. Ces méthodes s’appliquent aux systèmes intégrés dans des constructions au mur, au sol ou au plafond sans ouverture à l’air libre. Elles ne s’appliquent pas aux systèmes de panneaux montés au plafond dotés d’ouvertures à l’air libre non intégrés dans la structure d’un bâtiment.
La série ISO 11855 s’applique également, le cas échéant, à l’utilisation de fluides autres que l’eau en tant que medium de chauffage ou de refroidissement. La série ISO 11855 ne s’applique pas à l’essai des systèmes. Ces méthodes ne s’appliquent pas aux panneaux ou poutres de plafond chauffés ou refroidis.
[1]  L’ISO 11855-7 peut également être utilisée pour les systèmes intégrés de chauffage électriques.

Načrtovanje notranjega okolja v stavbah - Zasnova, dimenzioniranje, vgradnja in kontrola vgrajenih sevalnih ogrevalnih in hladilnih sistemov - 8. del: Električni sistemi za ogrevanje (ISO 11855-8:2023)

Ta dokument določa postopke in pogoje za določevanje toplotnega toka v električnih ploskovnih sistemih za ogrevanje glede na temperaturno razliko medija v sistemih. Določevanje toplotne učinkovitosti električnih ploskovnih sistemov za ogrevanje in njihove skladnosti s tem dokumentom se izvaja z izračunom v skladu s projektno dokumentacijo in modelom. To omogoča
enotno oceno in izračun sistemov za površinsko ogrevanje.
Kot rezultat so podani temperatura površine in enakomernost temperature ogrevane površine, nazivna gostota toplotnega toka med električno ogrevano plastjo in prostorom.
Skupina standardov ISO 11855 se uporablja za vgrajene ploskovne sisteme za ogrevanje in hlajenje z vodo v stanovanjskih, poslovnih ter industrijskih stavbah1). Metode se uporabljajo za sisteme, vgrajene v stensko, talno ali stropno konstrukcijo brez odprtih vmesnih zračnih prostorov. Ne uporablja se za sisteme stropnih panelov
z odprtim vmesnim zračnim prostorom, ki niso vgrajeni v stavbno konstrukcijo.
Skupina standardov ISO 11855 se, kadar je to ustrezno, uporablja tudi, ko se ogrevalni ali hladilni medij namesto vode uporabljajo druge tekočine. Ta serija standardov ISO 11855 se ne uporablja za preskušanje sistemov. Metode se ne uporabljajo za ogrevane ali hlajene stropne plošče ali tramove.

General Information

• Status: Published
• Publication Date: 12-Dec-2023
• ICS: 91.040.01 - Buildings in general
• Technical Committee: CEN/TC 228 - Heating systems in buildings
• Drafting Committee: CEN/TC 228 - Heating systems in buildings
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 13-Dec-2023
• Due Date: 30-Aug-2025
• Completion Date: 13-Dec-2023
• Ref Project: SIST EN ISO 11855-8:2024 - Building environment design - Design, dimensioning, installation and control of embedded radiant heating and cooling systems - Part 8: Electrical heating systems (ISO 11855-8:2023)

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2024
Načrtovanje notranjega okolja v stavbah - Zasnova, dimenzioniranje, vgradnja in
kontrola vgrajenih sevalnih ogrevalnih in hladilnih sistemov - 8. del: Električni
sistemi za ogrevanje (ISO 11855-8:2023)
Building environment design - Design, dimensioning, installation and control of
embedded radiant heating and cooling systems - Part 8: Electrical heating systems (ISO
11855-8:2023)
Umweltgerechte Gebäudeplanung - Flächenintegrierte Strahlungsheiz- und -
kühlsysteme - Teil 8: Elektrische Heizsysteme (ISO 11855-8:2023)
Conception de l'environnement des bâtiments - Conception, dimensionnement,
installation et contrôle des systèmes intégrés de chauffage et de refroidissement par
rayonnement - Partie 8: Titre manque (ISO 11855-8:2023)
Ta slovenski standard je istoveten z: EN ISO 11855-8:2023
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 11855-8
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 91.040.01
English Version
Building environment design - Design, dimensioning,
installation and control of embedded radiant heating and
cooling systems - Part 8: Electrical heating systems (ISO
11855-8:2023)
Conception de l'environnement des bâtiments - Umweltgerechte Gebäudeplanung - Planung,
Conception, dimensionnement, installation et contrôle Auslegung, Installation und Steuerung
des systèmes intégrés de chauffage et de flächenintegrierter Strahlheizungs- und -kühlsysteme -
refroidissement par rayonnement - Partie 8: Systèmes Teil 8: Elektrische Heizsysteme (ISO 11855-8:2023)
de chauffage électrique (ISO 11855-8:2023)
This European Standard was approved by CEN on 3 November 2023.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11855-8:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11855-8:2023) 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 June 2024, and conflicting national standards shall be
withdrawn at the latest by June 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 11855-8:2023 has been approved by CEN as EN ISO 11855-8:2023 without any
modification.
INTERNATIONAL ISO
STANDARD 11855-8
First edition
2023-12
Building environment design —
Design, dimensioning, installation and
control of embedded radiant heating
and cooling systems —
Part 8:
Electrical heating systems
Conception de l'environnement des bâtiments — Conception,
dimensionnement, installation et contrôle des systèmes intégrés de
chauffage et de refroidissement par rayonnement —
Partie 8: Systèmes de chauffage électrique
Reference number
ISO 11855-8:2023(E)
ISO 11855-8:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 11855-8:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and subscripts . 2
4.1 Symbols . 2
4.2 Subscripts . . 2
5 Calculation procedure of the heat flux . 3
Annex A (informative) Calculation procedure for electrical heating systems .8
Bibliography . 9
iii
ISO 11855-8:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 205, Building environment design, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC
228, Heating systems and water based cooling systems in buildings, in accordance with the Agreement on
technical cooperation between ISO and CEN (Vienna Agreement).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
.
iv
ISO 11855-8:2023(E)
Introduction
The radiant heating and cooling system consists of heat emitting/absorbing, heat supply, distribution,
and control systems. The ISO 11855 series deals with the embedded surface heating and cooling system
that directly controls heat exchange within the space. It does not include the system equipment itself,
such as heat source, distribution system and controller.
The ISO 11855 series addresses an embedded system that is integrated with the building structure.
Therefore, the panel system with open air gap, which is not integrated with the building structure, is
not covered by this series.
The ISO 11855 series can be applied to systems that use not only water but also other liquids or
electricity as a heating or cooling medium.
The object of the ISO 11855 series is to provide criteria to effectively design embedded systems. To do
this, it presents comfort criteria for the space served by embedded systems, heat output calculation,
dimensioning, dynamic analysis, installation, operation, and control method of embedded systems.
The following is a summary of the ISO 11855 parts:
— ISO 11855-1 specifies the comfort criteria which should be considered in designing embedded
radiant heating and cooling systems, since the main objective of the radiant heating and cooling
system is to satisfy thermal comfort of the occupants.
— ISO 11855-2 provides steady-state calculation methods for determination of the heating and cooling
capacity.
— ISO 11855-3 specifies design and dimensioning methods of radiant heating and cooling systems to
ensure the heating and cooling capacity.
— ISO 11855-4 provides a dimensioning and calculation method to design Thermo Active Building
Systems (TABS) for energy-saving purposes, since radiant heating and cooling systems can reduce
energy consumption and heat source size by using renewable energy.
— ISO 11855-5 addresses the installation process for the system to operate as intended.
— ISO 11855-6 shows a proper control method of the radiant heating and cooling systems to ensure
the maximum performance which was intended in the design stage when the system is actually
being operated in a building.
— ISO 11855-7 presents a calculation method for the product specific input parameters for ISO 52031.
— ISO 11855-8 (this document) presents a calculation method for electrical heating systems.
v
INTERNATIONAL STANDARD ISO 11855-8:2023(
...