SIST EN ISO 11855-5:2021
(Main)Building environment design - Embedded radiant heating and cooling systems - Part 5: Installation (ISO 11855-5:2021)
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
RELATIONS
Standards Content (sample)
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
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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
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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
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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
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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
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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 dimensioning3 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 designISO 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 applicationsEN 1254 (all parts), Copper and copper alloys — Plumbing fittings
DIN 4724, Kunststoff-Rohrleitungssysteme für Warmwasserheizung und Heizkörperanbindung —
Vernetztes Polyethylen mittlerer Dichte (PE-MDX)© ISO 2020 – All rights reserved 1
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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 abbreviationsSymbol 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 components5.1.2.1 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,insas 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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