prEN ISO 11855-8

Building environment design - Design, dimensioning, installation and control of embedded radiant heating and cooling systems - Part 8: Electrical heating systems (ISO/DIS 11855-8:2022)

This part of ISO 11855 specifies procedures and conditions to enable the heat flow in water based and electrical surface heating and cooling systems to be determined relative to the medium differential temperature for systems. The determination of thermal performance of water based surface heating and cooling systems and their conformity to this part of ISO 11855 is carried out by calculation in accordance with design documents and a model. This should enable a uniform assessment and calculation of water based surface heating and cooling systems.
The surface temperature and the temperature uniformity of the heated/cooled surface, nominal heat flow density between water or electrical heated layer and space, the associated nominal medium differential temperature, and the field of characteristic curves for the relationship between heat flow density and the determining variables 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. 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.
Part 7 of the ISO 11855 series can also be used for electrical heated embedded systems.

Umweltgerechte Gebäudeplanung - Flächenintegrierte Strahlungsheiz- und -kühlsysteme - Teil 8: Elektrische Heizsysteme (ISO/DIS 11855-8:2022)

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/DIS 11855-8:2022)

Načrtovanje notranjega okolja v stavbah - Zasnova, dimenzioniranje, vgradnja in kontrola vgrajenih sevalnih ogrevalnih in hladilnih sistemov - 8. del: Električni sistemi za ogrevanje (ISO/DIS 11855-8:2022)

General Information

• Status: Not Published
• Publication Date: 18-Dec-2024
• 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: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 17-Apr-2023
• Due Date: 27-Dec-2024
• Completion Date: 17-Apr-2023
• Ref Project: oSIST prEN 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/DIS 11855-8:2022)

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 11855-8:2023
01-januar-2023
Načrtovanje notranjega okolja v stavbah - Zasnova, dimenzioniranje, vgradnja in

kontrola vgrajenih sevalnih ogrevalnih in hladilnih sistemov - 8. del: Električni

sistemi za ogrevanje (ISO/DIS 11855-8:2022)
Building environment design - Design, dimensioning, installation and control of

embedded radiant heating and cooling systems - Part 8: Electrical heating systems

(ISO/DIS 11855-8:2022)
Umweltgerechte Gebäudeplanung - Flächenintegrierte Strahlungsheiz- und -
kühlsysteme - Teil 8: Elektrische Heizsysteme (ISO/DIS 11855-8:2022)
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/DIS 11855-8:2022)
Ta slovenski standard je istoveten z: prEN ISO 11855-8
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
oSIST prEN ISO 11855-8:2023 en,fr,de

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

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oSIST prEN ISO 11855-8:2023
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oSIST prEN ISO 11855-8:2023
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11855-8
ISO/TC 205 Secretariat: ANSI
Voting begins on: Voting terminates on:
2022-11-25 2023-02-17
Building environment design — Design, dimensioning,
installation and control of embedded radiant heating and
cooling systems —
Part 8:
Electrical heating systems
ICS: 91.040.01
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 11855-8:2022(E)
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. © ISO 2022
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oSIST prEN ISO 11855-8:2023
ISO/DIS 11855-8:2022(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11855-8
ISO/TC 205 Secretariat: ANSI
Voting begins on: Voting terminates on:
Building environment design — Design, dimensioning,
installation and control of embedded radiant heating and
cooling systems —
Part 8:
Electrical heating systems
ICS: 91.040.01
This document is circulated as received from the committee secretariat.
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2022
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

NOT BE REFERRED TO AS AN INTERNATIONAL

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

IN ADDITION TO THEIR EVALUATION AS

or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,

TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: [phone]
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: [e-mail]
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 11855-8:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
© ISO 2022 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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oSIST prEN ISO 11855-8:2023
ISO/DIS 11855-8:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .............................................................................................................................................................................................................................. vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Symbols and abbreviations ......................................................................................................................................................................2

4.1 Symbols ......................................................................................................................................................................................................... 2

4.2 Subscripts ...................................................................... .............................................................................................................................. 2

5 Calculation procedure.................................................................................................................................................................................... 3

Annex A (informative) Calculation Procedure of Electrical Heating System ...........................................................8

Bibliography ................................................................................................................................................................................................................................ 9

iii
© ISO 2022 – All rights reserved
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oSIST prEN ISO 11855-8:2023
ISO/DIS 11855-8:2022(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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

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, Working

Group 8, Radiant heating and cooling systems.

ISO 11855 consists of the following parts, under the general title Building environment design — Design,

dimensioning, installation and control of embedded radiant heating and cooling systems:

— Part 1: Definition, symbols, and comfort criteria
— Part 2: Determination of the design and heating and cooling capacity
— Part 3: Design and dimensioning

— Part 4: Dimensioning and calculation of the dynamic heating and cooling capacity of Thermo Active

Building Systems (TABS)
— Part 5: Installation
— Part 6: Control
— Part 7: Input parameters for the energy calculation
— Part 8: Electrical heating systems

Part 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. Part 2 provides steady-state calculation methods for determination

of the heating and cooling capacity. Part 3 specifies design and dimensioning methods of radiant

heating and cooling systems to ensure the heating and cooling capacity. Part 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. Part 5 addresses the installation process for the system to operate as intended. Part 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

© ISO 2022 – All rights reserved
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oSIST prEN ISO 11855-8:2023
ISO/DIS 11855-8:2022(E)

building. Part 7 presents a calculation method for the product specific input parameters for ISO 52031.

Part 8 presents a calculation method for electrical heating systems.
© ISO 2022 – All rights reserved
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oSIST prEN ISO 11855-8:2023
ISO/DIS 11855-8:2022(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

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