Building environment design - Embedded radiant heating and cooling systems - Part 5: Installation (ISO 11855-5:2021)

This document establishes requirements for the installation of embedded radiant heating and cooling
systems. It specifies general and uniform requirements for the design and construction of heating
and cooling floors, ceiling and wall structures to ensure that the heating/cooling systems are suited
to the particular application. The requirements specified by this document are applicable only to the
components of the heating/cooling systems and the elements which are part of the heating/cooling
surface and which are installed due to the heating/cooling systems.
This document 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, but are not applicable to panel systems
with open-air gaps which are not integrated into the building structure.

Umweltgerechte Gebäudeplanung - Flächenintegrierte Strahlheizungs- und -kühlsysteme - Teil 5: Installation (ISO 11855-5:2021)

Dieser Teil der Normenreihe ISO 11855 legt Anforderungen für die Installation flächenintegrierter Strahlheizungs- und -kühlsysteme fest. Es werden allgemeine und einheitliche Anforderungen an die Auslegung und Konstruktion der Fußboden-, Decken- und Wandheiz- und -kühlsysteme bestimmt, um die Tauglichkeit der Heiz- bzw. Kühlsysteme für ihre jeweilige Anwendung zu gewährleisten. Die in diesem Teil der Normenreihe ISO 11855 beschriebenen Anforderungen sind nur für die Komponenten der Heiz- bzw. Kühlsysteme sowie für die Elemente, die Teil der Heiz- bzw. Kühloberfläche sind und im Zusammenhang mit dem Heiz- bzw. Kühlsystem installiert werden, anwendbar.
Die Normenreihe ISO 11855 ist für integrierte Flächenheizungs- und -kühlsysteme mit Wasserdurch-strömung in Wohn-, Gewerbe- und Industriegebäuden anwendbar. Die Verfahren gelten für in Wände, Boden- und Deckenkonstruktionen flächenintegrierte Systeme ohne offene Luftspalte. Flächensysteme mit offenen Luftspalten, die nicht in die Gebäudestruktur eingebunden sind, werden nicht von ihr erfasst.

Conception de l'environnement des bâtiments - Systèmes intégrés de chauffage et de refroidissement par rayonnement - Partie 5 : Installation (ISO 11855-5:2021)

Načrtovanje notranjega okolja v stavbah - Vgrajeni sevalni ogrevalni in hladilni sistemi - 5. del: Vgradnja (ISO 11855-5:2021)

General Information

Status
Published
Public Enquiry End Date
09-Aug-2020
Publication Date
07-Oct-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
21-Sep-2021
Due Date
26-Nov-2021
Completion Date
08-Oct-2021

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SLOVENSKI STANDARD
SIST EN ISO 11855-5:2021
01-november-2021
Nadomešča:
SIST EN ISO 11855-5:2015
Načrtovanje notranjega okolja v stavbah - Vgrajeni sevalni ogrevalni in hladilni
sistemi - 5. del: Vgradnja (ISO 11855-5:2021)

Building environment design - Embedded radiant heating and cooling systems - Part 5:

Installation (ISO 11855-5:2021)
Umweltgerechte Gebäudeplanung - Flächenintegrierte Strahlheizungs- und -
kühlsysteme - Teil 5: Installation (ISO 11855-5:2021)

Conception de l'environnement des bâtiments - Systèmes intégrés de chauffage et de

refroidissement par rayonnement - Partie 5 : Installation (ISO 11855-5:2021)
Ta slovenski standard je istoveten z: EN ISO 11855-5:2021
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
SIST EN ISO 11855-5:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 11855-5:2021
---------------------- Page: 2 ----------------------
SIST EN ISO 11855-5:2021
EN ISO 11855-5
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2021
EUROPÄISCHE NORM
ICS 91.040.01 Supersedes EN ISO 11855-5:2015
English Version
Building environment design - Embedded radiant heating
and cooling systems - Part 5: Installation (ISO 11855-
5:2021)

Conception de l'environnement des bâtiments - Umweltgerechte Gebäudeplanung - Flächenintegrierte

Systèmes intégrés de chauffage et de refroidissement Strahlheizungs- und -kühlsysteme - Teil 5: Installation

par rayonnement - Partie 5 : Installation (ISO 11855- (ISO 11855-5:2021)
5:2021)
This European Standard was approved by CEN on 30 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 11855-5:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 11855-5:2021
EN ISO 11855-5:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 11855-5:2021
EN ISO 11855-5:2021 (E)
European foreword

This document (EN ISO 11855-5:2021) 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 11855-5:2015.

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 11855-5:2021 has been approved by CEN as EN ISO 11855-5:2021 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 11855-5:2021
---------------------- Page: 6 ----------------------
SIST EN ISO 11855-5:2021
INTERNATIONAL ISO
STANDARD 11855-5
Second edition
2021-08
Building environment design —
Embedded radiant heating and cooling
systems —
Part 5:
Installation
Conception de l'environnement des bâtiments — Systèmes intégrés de
chauffage et de refroidissement par rayonnement —
Partie 5: Installation
Reference number
ISO 11855-5:2021(E)
ISO 2021
---------------------- Page: 7 ----------------------
SIST EN ISO 11855-5:2021
ISO 11855-5:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 11855-5:2021
ISO 11855-5:2021(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

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

4 Symbols .......................................................................................................................................................................................................................... 1

5 Installation ................................................................................................................................................................................................................. 2

5.1 Floor heating and cooling systems ........................................................................................................................................ 2

5.1.1 General structural preconditions ...................................................................................................................... 2

5.1.2 Building layers, building components ........................................................................................................... 2

5.1.3 Leak test .................................................................................................................................................................................. 7

5.1.4 Initial heating up of the emission system ................................................................................................... 7

5.1.5 Floor coverings .................................................................................................................................................................. 8

5.2 Heating and cooling systems embedded in ceilings and walls ...................................................................... 8

5.2.1 General...................................................................................................................................................................................... 8

5.2.2 General structural preconditions ...................................................................................................................... 9

5.2.3 Insulation ............................................................................................................................................................................... 9

Annex A (informative) Corrosion prevention ...........................................................................................................................................10

Bibliography .............................................................................................................................................................................................................................11

© ISO 2021 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 11855-5:2021
ISO 11855-5:2021(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

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, 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).

This second edition cancels and replaces the first edition (ISO 11855-5:2012), which has been

technically revised.
The main changes compared to the previous edition are as follows:
— modified Clause 2 (Normative references) and the Bibliography;
— modified Clause 4 (Symbols);
— added a new subclause on vapour barrier and other layers (see 5.1.2.2);

— modified the subclause on insulating layers, perimeter insulating strip adding a new approach and

adding details for thermal resistance of insulating layer (see 5.1.2.3);

— added new subclauses on insulating layers for systems in new constructions (see 5.1.2.3.2) and in

refurbished systems (see 5.1.2.3.3);

— modified the subclauses on joints (see 5.1.2.8.3), leak test (see 5.1.3), initial heating up of the

emission system (see 5.1.4) and general structural preconditions (see 5.2.2);

— removed the subclause on maximum heating fluid flow temperatures (previously 5.2.4);

— improved wording and made editorial changes.
A list of all parts in the ISO 11855 series can be found on the ISO website.

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 2021 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 11855-5:2021
ISO 11855-5:2021(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 is applicable to water-based embedded surface heating and cooling systems

in buildings. The ISO 11855 series is applied to systems using not only water but also other fluids or

electricity 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.

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, control method of embedded systems, and input

parameters for the energy calculations.

The ISO 11855 series consists of the following parts, under the general title Building environment

design — Embedded radiant heating and cooling systems:
— Part 1: Definitions, symbols, and comfort criteria
— Part 2: Determination of the design 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

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, this document, 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 input parameters to ISO 52031.
© ISO 2021 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 11855-5:2021
---------------------- Page: 12 ----------------------
SIST EN ISO 11855-5:2021
INTERNATIONAL STANDARD ISO 11855-5:2021(E)
Building environment design — Embedded radiant heating
and cooling systems —
Part 5:
Installation
1 Scope

This document establishes requirements for the installation of embedded radiant heating and cooling

systems. It specifies general and uniform requirements for the design and construction of heating

and cooling floors, ceiling and wall structures to ensure that the heating/cooling systems are suited

to the particular application. The requirements specified by this document are applicable only to the

components of the heating/cooling systems and the elements which are part of the heating/cooling

surface and which are installed due to the heating/cooling systems.

This document 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, but are not applicable to panel systems

with open-air gaps which are not integrated into the building structure.
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.

ISO 11855-1, Building environment design — Design, dimensioning, installation and control of embedded

radiant heating and cooling systems — Part 1: Vocabulary, symbols, and comfort criteria

ISO 11855-3, Building environment design — Design, dimensioning, installation and control of embedded

radiant heating and cooling systems — Part 3: Design and dimensioning
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 11855-1 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/
4 Symbols
For the purposes of this document, the symbols in Table 1 apply.
Table 1 — Symbols
Symbol Unit Quantity
D m External diameter of the pipe, including sheathing where used
Heating/cooling system can be work on heating mode, cooling mode or both.
© ISO 2021 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 11855-5:2021
ISO 11855-5:2021(E)
Table 1 (continued)
Symbol Unit Quantity
2 a
R m K/W Thermal resistance of the insulating layer of the heating/cooling system
λ,ins
s m Thickness of thermal insulation
ins
ϑ °C External design temperature
ϑ °C Maximum heating water flow temperatures
V,des,max
λ W/(m·K) Thermal conductivity of the thermal insulation layer
ins
q W/m Heat flow density at the surface
q W/m Outward heat flow density
In type B systems, thickness of thermal insulation from the outward edge of
s m
the insulation to the inward edge of the pipes (see Figure 2)
s m Thickness of the upper part of the slab
W m Pipe spacing
Heating/cooling system can be work on heating mode, cooling mode or both.
5 Installation
5.1 Floor heating and cooling systems
5.1.1 General structural preconditions

The installation of a hydronic floor heating and cooling system shall follow the previous installation

of any electrical, sanitary or other pipe facilities. The structure including the closure of all building

openings, e.g. windows and outer doors, shall be comple
...

SLOVENSKI STANDARD
oSIST prEN ISO 11855-5:2020
01-julij-2020
Načrtovanje okolja v stavbah - Vgrajeni hladilni in ogrevalni sistemi - 5. del:
Vgradnja (ISO/DIS 11855-5:2020)

Building environment design - Embedded radiant heating and cooling systems - Part 5:

Installation (ISO/DIS 11855-5:2020)
Umweltgerechte Gebäudeplanung - Flächenintegrierte Strahlheizungs- und -
kühlsysteme - Teil 5: Installation (ISO/DIS 11855-5:2020)

Conception de l'environnement des bâtiments - Systèmes intégrés de chauffage et de

refroidissement par rayonnement - Partie 5 : Installation (ISO/DIS 11855-5:2020)
Ta slovenski standard je istoveten z: prEN ISO 11855-5
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 11855-5:2020 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN ISO 11855-5:2020
---------------------- Page: 2 ----------------------
oSIST prEN ISO 11855-5:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11855-5
ISO/TC 205 Secretariat: ANSI
Voting begins on: Voting terminates on:
2020-06-09 2020-09-01
Building environment design — Embedded radiant heating
and cooling systems —
Part 5:
Installation

Conception de l'environnement des bâtiments — Systèmes intégrés de chauffage et de refroidissement par

rayonnement —
Partie 5: Installation
ICS: 91.040.01
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
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 11855-5:2020(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 2020
---------------------- Page: 3 ----------------------
oSIST prEN ISO 11855-5:2020
ISO/DIS 11855-5:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 11855-5:2020
ISO/DIS 11855-5:2020(E)
Contents Page

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

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

5 Installation ................................................................................................................................................................................................................. 2

5.1 Floor heating and cooling systems ........................................................................................................................................ 2

5.1.1 General structural preconditions ...................................................................................................................... 2

5.1.2 Building layers, building components ........................................................................................................... 2

5.1.3 Leak test .................................................................................................................................................................................. 9

5.1.4 Initial heating up .............................................................................................................................................................. 9

5.1.5 Floor coverings ...............................................................................................................................................................10

5.2 Heating and cooling systems embedded in ceilings and walls ...................................................................10

5.2.1 General...................................................................................................................................................................................10

5.2.2 General structural preconditions ...................................................................................................................10

5.2.3 Insulation ............................................................................................................................................................................11

5.2.4 Maximum heating fluid flow temperatures ...........................................................................................11

Annex A (informative) Corrosion prevention ...........................................................................................................................................12

Bibliography .............................................................................................................................................................................................................................13

© ISO 2020 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 11855-5:2020
ISO/DIS 11855-5:2020(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International

Standards adopted by the technical committees are circulated to the member bodies for voting.

Publication as an International Standard requires approval by at least 75 % of the member bodies

casting a vote.

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.

ISO 11855-5 was prepared by Technical Committee ISO/TC 205, Building environment design

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 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

building. Part 7 presents a calculation method for input parameters to ISO 52031.

iv © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 11855-5:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 11855-5:2020(E)
Building environment design — Embedded radiant heating
and cooling systems —
Part 5:
Installation
1 Scope

This part of ISO 11855 establishes requirements for the installation of embedded radiant heating and

cooling systems. It specifies general and uniform requirements for the design and construction of

heating and cooling floors, ceiling and wall structures to ensure that the heating/cooling systems are

suited to the particular application. The requirements specified by this part of ISO 11855 are applicable

only to the components of the heating/cooling systems and the elements which are part of the heating/

cooling surface and which are installed due to the heating/cooling systems.

This part of ISO 11855 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, but are not applicable to panel systems

with open-air gaps which are not integrated into the building structure.
2 Normative references

The following referenced documents are indispensable for the application 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.

ISO 10508:2006, Plastics piping systems for hot and cold water installations — Guidance for classification

and design

ISO 11855-1, Building environment design — Design, dimensioning, installation and control of embedded

radiant heating and cooling systems — Part 1: Vocabulary, symbols, and comfort criteria

ISO 15874 (all parts), Plastics piping systems for hot and cold water installations — Polypropylene (PP)

ISO 15875 (all parts), Plastics piping systems for hot and cold water installations — Crosslinked

polyethylene (PE-X)

ISO 15876 (all parts), Plastics piping systems for hot and cold water installations — Polybutene (PB)

ISO 15877 (all parts), Plastics piping systems for hot and cold water installations — Chlorinated poly(vinyl

chloride) (PVC-C)

ISO 21003-1, Multilayer piping systems for hot and cold water installations inside buildings — Part 1: General

ISO 22391 (all parts), Plastics piping systems for hot and cold water installations — Polyethylene of raised

temperature resistance (PE-RT)

EN 1057, Copper and copper alloys — Seamless, round copper tubes for water and gas in sanitary and

heating applications
EN 1254 (all parts), Copper and copper alloys — Plumbing fittings

DIN 4724, Kunststoff-Rohrleitungssysteme für Warmwasserheizung und Heizkörperanbindung —

Vernetztes Polyethylen mittlerer Dichte (PE-MDX)
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oSIST prEN ISO 11855-5:2020
ISO/DIS 11855-5:2020(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 11855-1 apply.

Note 1 to entry All terms and definitions in this part of ISO 11855 are consistent with ISO 7345, ISO 9229,

ISO 9288, ISO 9346 and ISO 16818.
4 Symbols and abbreviations

For the purposes of this document, the symbols and abbreviations in Table 1 apply.

Table 1 — Symbols and abbreviations
Symbol Unit Quantity
D m External diameter of the pipe, including sheathing where used
R m K/W thermal resistance of the insulating layer of the heating/cooling system
λ,ins
s m Thickness of thermal insulation
ins
ϑ °C external design temperature
ϑ °C maximum heating water flow temperatures
V,des,max
λ W/(m·K) Thermal conductivity of the thermal insulation layer
ins
q W/m Heat flow density at the surface
q W/m Outward heat flow density
In Type B systems, thickness of thermal insulation from the outward edge of
s m
the insulation to the inward edge of the pipes (see Figure 2)
s m Thickness of the upper part of the slab
W m Pipe spacing
5 Installation
5.1 Floor heating and cooling systems
5.1.1 General structural preconditions

The installation of a hot water floor heating and/or cooling system must follow the previous installation

of any electrical, sanitary and other pipe facilities. The structure as specified in 5.1.2.1, along with the

closure of all building openings, e.g. windows and outer doors, must be completed.

5.1.2 Building layers, building components
5.1.2.1 Supporting base

The supporting base shall be prepared in accordance with relevant standards. Any pipe work or

conduits shall be fixed and encased to provide a level base upon which thermal insulation and/or

acoustic insulation is added before laying the heating pipes. In this respect, the necessary structural

height shall be taken into account. Where service pipes are installed within the insulating layer, they

must be protected against temperature change in accordance with national regulations. If the external

doors and windows are not present before the installation of the radiant system, it is recommended to

close all windows holes, even with provisional systems (in order to avoid too high / low temperatures

and to limit the effect of the speed of the air). Walls plaster must be completed.

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oSIST prEN ISO 11855-5:2020
ISO/DIS 11855-5:2020(E)
5.1.2.2 Vapour barrier and other layer

Before install perimeter insulating strip and insulating layers, depending on the type of flooring (e.g

wood floor, resin floor, ..) and the system's boundary conditions (installation of floor system on the

ground, installation of floor system above unheated environment) must be evaluated the installation

of any other layers, for example vapour barrier or similar, in accordance with national regulations and

with relevant standards.
5.1.2.3 Insulating layers, perimeter insulating strip
5.1.2.3.1 Thermal resistance of insulating layers

The thermal resistance R of the insulating layers of the heating/cooling system shall be calculated

λ,ins
as reported in Table 2.
Table 2 — Thermal resistance of insulating layer
ins
R = (1)
λ ,ins
ins
R is the sum of all the layers
λ,ins
with λ < 0.1 W/(m·K) under the
ins
pipeline and over the structural
bearing. Layers must be continued
and have a certification of λ sup-
ins
plied by the manufacturer.
Figure 1 — Example of layers for the calculation of R - Type A and C
λ,ins
Key
1 Floor covering
2 Weight bearing and thermal diffusion layer
3 Thermal insulation
4 Acoustic insulation (if present))
5 Structural bearing
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oSIST prEN ISO 11855-5:2020
ISO/DIS 11855-5:2020(E)
Table 2 (continued)
R is the sum of all the layers
λ,ins
with λ < 0.1 W/(m·K) under the
ins
pipeline and over the structural
bearing. Layers must be continued
and have a certification of λ sup-
ins
plied by the manufacturer.
Figure 2. Type A and C. System with studs
Key
1 Floor covering
2 Weight bearing and thermal diffusion layer
3 Thermal insulation with studs
4 Acoustic insulation (if present)
5 Structural bearing
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oSIST prEN ISO 11855-5:2020
ISO/DIS 11855-5:2020(E)
Table 2 (continued)
sW⋅−Ds+⋅D
s = (2)
ins
R is the sum of all the layers
λ,ins
with λ < 0.1 W/(m·K) under the
ins
pipeline and over the structural
bearing. Layers must be continued
and have a certification of λ sup-
ins
plied by the manufacturer.
Figure 3. Type B
Key
1 Floor covering
2 Weight bearing and thermal diffusion layer
3 Thermal insulation
4 Acoustic insulation (optional)
5 Lightened screed (if present)
6 Structural bearing
R is the sum of all the layers
λ,ins
with λ < 0.1 W/(m·K) under the
pipeline. Layer
...

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