SIST EN ISO 15758:2014
(Main)Hygrothermal performance of building equipment and industrial installations - Calculation of water vapour diffusion - Cold pipe insulation systems (ISO 15758:2014)
Hygrothermal performance of building equipment and industrial installations - Calculation of water vapour diffusion - Cold pipe insulation systems (ISO 15758:2014)
EN ISO 15758 specifies a method for calculating the density of the water vapour flow rate in cold pipe insulation systems, and the total amount of water diffused into the insulation over time. The calculation method presupposes that water vapour can only migrate into the insulation system by diffusion, with no contribution from airflow. It also assumes the use of homogeneous, isotropic insulation materials so that the water vapour partial pressure is constant at all points equidistant from the axis of the pipe. This International Standard is applicable when the temperature of the medium in the pipe is above 0 °C. It applies to pipes inside buildings as well as in the open air.
Wärmedämmung von haus- und betriebstechnischen Anlagen in Gebäuden - Berechnung der Wasserdampfdiffusion - Dämmung von Kälteleitungen (ISO 15758:2014)
Diese Norm legt ein Verfahren fest zur Berechnung der Wasserdampf-Diffusionsstromdichte in Dämmsystemen für Kälteleitungen und der durch die Dämmung über die Zeit aufgenommenen Wassermenge. Bei diesem Berechnungsverfahren wird davon ausgegangen, dass die Absorption von Wasserdampf durch das Dämmsystem nur durch Diffusion ohne Mitwirkung einer Luftströmung erfolgt. Ferner wird davon ausgegangen, dass homogene isotrope Dämmstoffe verwendet werden, so dass der Wasserdampfteildruck an allen Punkten, die von der Rohrachse einen gleichen Abstand haben, konstant ist.
Die Norm gilt für Rohre im Inneren von Gebäuden sowie im Freien, wenn die Temperatur des im Rohr befindlichen Mediums über 0 °C liegt
Performance hygrothermique des équipements de bâtiments et installations industrielles - Calcul de la diffusion de vapeur d'eau - Systèmes d'isolation de tuyauteries froides (ISO 15758:2014)
L'ISO 15758:2014 donne une méthode permettant de calculer la densité du flux de vapeur d'eau dans les systèmes d'isolation de tuyauteries froides, ainsi que la quantité totale d'eau diffusée dans l'isolation au cours du temps. La méthode de calcul suppose que la vapeur d'eau ne peut migrer dans le système d'isolation que par diffusion, sans aucune contribution d'un flux d'air. Elle suppose également l'utilisation de matériaux isolants homogènes et isotropes, de telle sorte que la pression partielle de vapeur d'eau soit constante en tout point équidistant de l'axe du tuyau.
L'ISO 15758:2014 s'applique lorsque la température du fluide circulant dans le tuyau est supérieure à 0 °C. Elle s'applique aussi bien aux tuyauteries situées à l'intérieur de bâtiments qu'à celles situées à l'air libre.
Higrotermalno obnašanje opreme stavb in industrijskih inštalacij - Izračun difuzije vodne pare - Sistemi za izoliranje hladnih cevi (ISO 15758:2014)
Standard EN ISO 15758 določa metodo za izračun gostote hitrosti pretoka vodne pare v sistemih za izoliranje hladnih cevi ter skupne količine vode, sčasoma difundirane v izolacijo. Metoda izračuna predpostavlja, da lahko vodna para v sistem za izoliranje preide samo z difuzijo, brez prispevka pretoka zraka. Predvideva tudi uporabo homogenih, izotropnih izolacijskih materialov, da je delni tlak vodne pare stalen na vseh točkah, enako oddaljenih od osi cevi. Ta mednarodni standard se uporablja, kadar je temperatura medija v cevi nad 0 °C. Uporablja se za cevi v stavbah in na prostem.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 15758:2014
01-september-2014
1DGRPHãþD
SIST EN 14114:2002
+LJURWHUPDOQRREQDãDQMHRSUHPHVWDYELQLQGXVWULMVNLKLQãWDODFLM,]UDþXQGLIX]LMH
YRGQHSDUH6LVWHPL]DL]ROLUDQMHKODGQLKFHYL ,62
Hygrothermal performance of building equipment and industrial installations - Calculation
of water vapour diffusion - Cold pipe insulation systems (ISO 15758:2014)
Wärmedämmung von haus- und betriebstechnischen Anlagen in Gebäuden -
Berechnung der Wasserdampfdiffusion - Dämmung von Kälteleitungen (ISO
15758:2014)
Performance hygrothermique des équipements de bâtiments et installations industrielles
- Calcul de la diffusion de vapeur d'eau - Systèmes d'isolation de tuyauteries froides (ISO
15758:2014)
Ta slovenski standard je istoveten z: EN ISO 15758:2014
ICS:
91.120.10 Toplotna izolacija stavb Thermal insulation
SIST EN ISO 15758:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 15758:2014
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SIST EN ISO 15758:2014
EUROPEAN STANDARD
EN ISO 15758
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2014
ICS 91.120.10; 91.140.01 Supersedes EN 14114:2002
English Version
Hygrothermal performance of building equipment and industrial
installations - Calculation of water vapour diffusion - Cold pipe
insulation systems (ISO 15758:2014)
Performance hygrothermique des équipements de Wärmedämmung von haus- und betriebstechnischen
bâtiments et installations industrielles - Calcul de la Anlagen in Gebäuden - Berechnung der
diffusion de vapeur d'eau - Systèmes d'isolation de Wasserdampfdiffusion - Dämmung von Kälteleitungen (ISO
tuyauteries froides (ISO 15758:2014) 15758:2014)
This European Standard was approved by CEN on 20 March 2014.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15758:2014 E
worldwide for CEN national Members.
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SIST EN ISO 15758:2014
EN ISO 15758:2014 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 15758:2014
EN ISO 15758:2014 (E)
Foreword
This document (EN ISO 15758:2014) has been prepared by Technical Committee ISO/TC 163 “Thermal
performance and energy use in the built environment” in collaboration with Technical Committee CEN/TC 89
“Thermal performance of buildings and building components” the secretariat of which is held by SIS.
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 November 2014, and conflicting national standards shall be withdrawn
at the latest by November 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 14114:2002.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 15758:2014 has been approved by CEN as EN ISO 15758:2014 without any modification.
3
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SIST EN ISO 15758:2014
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SIST EN ISO 15758:2014
INTERNATIONAL ISO
STANDARD 15758
Second edition
2014-05-01
Hygrothermal performance of
building equipment and industrial
installations — Calculation of
water vapour diffusion — Cold pipe
insulation systems
Performance hygrothermique des équipements de bâtiments et
installations industrielles — Calcul de la diffusion de vapeur d’eau —
Systèmes d’isolation de tuyauteries froides
Reference number
ISO 15758:2014(E)
©
ISO 2014
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SIST EN ISO 15758:2014
ISO 15758:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014
All rights reserved. Unless otherwise specified, 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
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
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SIST EN ISO 15758:2014
ISO 15758:2014(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
4 Calculation formulae . 3
4.1 General . 3
4.2 Homogeneous insulation . 3
4.3 Multi-layer insulation systems . 4
4.4 Systems with capacity for drying . 4
5 Boundary conditions . 5
6 Calculation procedure . 6
6.1 General . 6
6.2 Calculation of rate of condensation in single homogenous insulation layer . 6
6.3 Calculation of rate of condensation in multi-layer insulation system . 6
Annex A (informative) Examples . 9
Annex B (informative) System with capacity for drying and experimental determination of
evaporation rate from surface of wet wick fabric .11
Bibliography .15
© ISO 2014 – All rights reserved iii
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SIST EN ISO 15758:2014
ISO 15758:2014(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. 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. 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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 163, Thermal performance and energy use in the
built environment, Subcommittee SC 2, Calculation methods.
This second edition cancels and replaces the first edition (ISO 15758:2004), which has been technically
revised. The main changes are the following:
— in Clause 5, b), the alternative of using annual mean temperature and vapour pressure has been
removed;
— the method of calculation given in 6.3 has been changed such that the total amount of condensation
water in the whole pipe system is calculated based only on the outermost tangent to the saturation
pressure, p ;
sat
— Figure 1 has been modified;
— the example given in A.3 has been changed;
— in Annex B, an explanation of the system with capacity for drying has been added;
— references have been added to the Bibliography.
iv © ISO 2014 – All rights reserved
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SIST EN ISO 15758:2014
ISO 15758:2014(E)
Introduction
If the thermal insulation of a cold pipe system is not completely water vapour tight, there will be a flow
of water vapour from the warm environment to the surface of the pipe, whenever the temperature of
the surface of the cold pipe is below the dew point of the ambient air. This flow of water vapour leads
to an interstitial condensation in the insulation layer and/or dew formation on the surface of the pipe
itself. Interstitial condensation may cause the insulation material to deteriorate and dew formation on
the surface of a metal pipe may cause corrosion over time. If the temperature is below 0 °C ice will be
formed and the methods of this standard will not apply.
In period, when the dew point of the ambient air is higher than the temperature of the outer surface of
the insulation, surface condensation will occur. This is dealt with in ISO 12241.
Different measures are available to control water vapour transfer and reduce the amount of condensation.
The following are normally applied:
a) Installation of a vapour retarder;
b) Use of insulation materials with a high water vapour resistance factor (low permeability);
c) Use of a vapour retarder and a capillary active fabric to continuously remove condensed water from
the pipe surface to the environment; see Annex B for an example.
Which protection measure is chosen depends on the ambient climate, the temperature of the medium in
the pipe and the water vapour diffusion resistance of the insulation layer. The success of any system is
strongly dependent on workmanship and maintenance. In any case anti-corrosion measures should be
applied to a metal pipe in severe conditions.
The expected economic lifetime of an insulation system, assuming a maximum acceptable accumulated
moisture content, can be calculated using the methods in this standard.
© ISO 2014 – All rights reserved v
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SIST EN ISO 15758:2014
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SIST EN ISO 15758:2014
INTERNATIONAL STANDARD ISO 15758:2014(E)
Hygrothermal performance of building equipment and
industrial installations — Calculation of water vapour
diffusion — Cold pipe insulation systems
1 Scope
This International Standard specifies a method for calculating the density of the water vapour flow rate
in cold pipe insulation systems, and the total amount of water diffused into the insulation over time.
The calculation method presupposes that water vapour can only migrate into the insulation system
by diffusion, with no contribution from airflow. It also assumes the use of homogeneous, isotropic
insulation materials so that the water vapour partial pressure is constant at all points equidistant from
the axis of the pipe.
This International Standard is applicable when the temperature of the medium in the pipe is above 0 °C.
It applies to pipes inside buildings as well as in the open air.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 9346, Hygrothermal performance of buildings and building materials — Physical quantities for mass
transfer — Vocabulary
ISO 12241, Thermal insulation for building equipment and industrial installations — Calculation rules
ISO 12572, Hygrothermal performance of building materials and products — Determination of water
vapour transmission properties
ISO 13788, Hygrothermal performance of building components and building elements — Internal surface
temperature to avoid critical surface humidity and interstitial condensation — Calculation methods
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in ISO 9346, ISO 12572 and ISO 13788,
and the following terms, definitions and symbols (see Table 1) apply.
3.1
exposed moist area
surface area of a capillary active fabric that is exposed to the ambient atmosphere
3.2
vapour retarder
material with high resistance to the flow of water vapour
3.3
corrected water vapour diffusion equivalent air layer thickness
thickness of an imaginary plane layer with μ =1, and an area of πD which has the same diffusion
j
resistance as the layer j with μ = μ
j
Note 1 to entry: See Formula (18).
© ISO 2014 – All rights reserved 1
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SIST EN ISO 15758:2014
ISO 15758:2014(E)
Table 1 — Symbols and associated units
a
Symbol Quantity Unit
2
A’ Surface area from which evaporation takes place per linear metre of m /m
e
the pipe
D Outside diameter of cold pipe m
0
D Outside diameter of j-th layer of an insulation system m
j
D Outside diameter of the outer layer of an insulation system m
n
G Total moisture uptake over a period per linear metre of pipe [refer to kg/m
Formula (2)]
G’ Total moisture uptake over a period per linear metre of pipe kg/m
P Actual atmospheric pressure Pa
P Standard atmospheric pressure = 101 325 Pa
0
R Gas constant for water vapour = 461,5 J/(kg·K)
v
T Thermodynamic temperature K
Z’ Water vapour resistance of one thin foil, cladding or skin per linear m·s·Pa/kg
fl
metre of pipe
Z’ Water vapour resistance of j-th layer of an insulation system per lin- m·s·Pa/kg
j
ear metre of pipe
Z’ Water vapour resistance of insulation system per linear metre of pipe m·s·Pa/kg
P
d Thickness of an insulation layer m
2
f Evaporation factor kg/(m ·s·Pa)
e
g’ Water vapour flow rate within the insulation per linear metre of pipe kg/(m·s)
g’ Rate of condensation per linear metre of pipe kg/(m·s)
c
g’ Evaporation rate per linear metre of pipe kg/(m·s)
e
2
h Convection heat transfer coefficient W/(m ·K)
c
p Partial water vapour pressure Pa
p Partial water vapour pressure of air Pa
a
p Saturated water vapour pressure Pa
sat
s Water vapour diffusion equivalent air layer thickness m
d
s Water vapour diffusion equivalent air layer thickness of foils m
df
t Period of calculation (month or year) Month, year
x Distance m
δ Water vapour permeability kg/(m·s·Pa)
δ Water vapour permeability of air kg/(m·s·Pa)
0
σ Corrected water vapour diffusion equivalent air layer thickness of m
d,j
layer j
σ Total corrected water vapour diffusion equivalent air layer thickness m
d, j
from surface of cold pipe to the outside of layer j
μ Water vapour resistance factor —
θ Temperature of the medium in the pipe °C
0
a
For practical reasons, hours or days are often used instead of seconds as units of time.
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SIST EN ISO 15758:2014
ISO 15758:2014(E)
4 Calculation formulae
4.1 General
The density of water vapour flow rate, g, through a material is calculated by the following formula:
dp
g=−δ (1)
dx
where δ is the water vapour permeability of the material.
The total moisture uptake during a period, G, is given by
t
Gg= dt (2)
∫
0
In calculations the diffusion resistance factor, μ, is commonly used instead of the permeability:
δ
0
μ= (3)
δ
where δ is the water vapour permeability of still air, which can be calculated from
0
18, 1
0,083P T
0
δ = ⋅ (4)
0
RT
...
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