DIN EN ISO 15758-2014 Hygrothermal performance of building equipment and industrial installations - Calculation of water vapour diffusion - Cold pipe insulation systems (ISO 15758 .pdf

1、September 2014 Translation by DIN-Sprachendienst.English price group 12No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).

2、ICS 91.140.01; 91.120.10!%:Iz“2233887www.din.deDDIN EN ISO 15758Hygrothermal performance of building equipment and industrialinstallations Calculation of water vapour diffusion Cold pipe insulation systems (ISO 15758:2014);English version EN ISO 15758:2014,English translation of DIN EN ISO 15758:201

3、4-09Wrme- und feuchtetechnisches Verhalten von haus- und betriebstechnischen Anlagen Berechnung der Wasserdampfdiffusion Dmmung von Klteleitungen (ISO 15758:2014);Englische Fassung EN ISO 15758:2014,Englische bersetzung von DIN EN ISO 15758:2014-09Performance hygrothermique des quipements de btiment

4、s et installations industrielles Calcul de la diffusion de vapeur deau Systmes disolation de tuyauteries froides (ISO 15758:2014);Version anglaise EN ISO 15758:2014,Traduction anglaise de DIN EN ISO 15758:2014-09SupersedesDIN EN 14114:2002-11www.beuth.deDocument comprises pagesIn case of doubt, the

5、German-language original shall be considered authoritative.2308.14 DIN EN ISO 15758:2014-09 2 A comma is used as the decimal marker. National 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” i

6、n collaboration with Technical Committee CEN/TC 89 “Thermal performance of buildings and building components” (Secretariat: SIS, Sweden). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (DIN Standards Committee Building and Civil Engineering), Working Committ

7、ee NA 005-56-10 AA Dmmarbeiten an technischen Anlagen. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 9346 DIN EN ISO 9346 ISO 12241 DIN EN ISO 12241 ISO 12572 DIN EN ISO 12572 ISO 13788 DIN EN ISO 13788 Amendments This standard differ

8、s from DIN EN 14114:2002-11 as follows: a) Clause 5: the alternative of using the annual mean temperature and vapour pressure has been deleted; only the monthly mean value is to be used; b) Subclause 6.3: the method of calculation has been changed such that the total amount of condensation water in

9、the whole pipe system is calculated based only on the outermost tangent to the saturation pressure; c) Subclause 6.3: Figure 1 has been modified; d) Annex A: Subclause A.3 has been added; e) Annex B: an explanation of the system with capacity for drying has been added; f) references 10 to 15 have be

10、en added to the Bibliography. Previous editions DIN EN 14114: 2002-11 DIN EN ISO 15758:2014-09 3 National Annex NA (informative) Bibliography DIN EN ISO 9346, Hygrothermal performance of buildings and building materials Physical quantities for mass transfer Vocabulary DIN EN ISO 12241, Thermal insul

11、ation for building equipment and industrial installations Calculation rules DIN EN ISO 12572, Hygrothermal performance of building materials and products Determination of water vapour transmission properties DIN EN ISO 13788, Hygrothermal performance of building components and building elements Inte

12、rnal surface temperature to avoid critical surface humidity and interstitial condensation Calculation methods DIN EN ISO 15758:2014-09 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 15758 May 2014 ICS 91.120.10; 91.140.01 Supersedes EN 14114:2002English V

13、ersion Hygrothermal performance of building equipment and industrial installations - Calculation of water vapour diffusion - Cold pipe insulation systems (ISO 15758:2014) Performance hygrothermique des quipements de btiments et installations industrielles - Calcul de la diffusion de vapeur deau - Sy

14、stmes disolation de tuyauteries froides (ISO 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 a

15、ny 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 langu

16、age 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

17、, 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 FO

18、R STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR 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 worldwide for CEN national Members. Ref. No. EN ISO 15758:2014 EWrme- und feuchte

19、technisches Verhalten von haus- und betriebstechnischen Anlagen - Berechnung der Wasserdampfdiffusion - Dmmung von Klteleitungen (ISO 15758:2014) Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms, definitions and symbols .5 4 Calculation formulae .7 4.1 General 7 4.

20、2 Homogeneous insulation 7 4.3 Multi-layer insulation systems .8 4.4 Systems with capacity for drying .8 5 Boundary conditions .9 6 Calculation procedure .10 6.1 General 10 6.2 Calculation of rate of condensation in single homogenous insulation layer .10 6.3 Calculation of rate of condensation in mu

21、lti-layer insulation system .10 Annex A (informative) Examples .13 Annex B (informative) System with capacity for drying and experimental determination of evaporation rate from surface of wet wick fabric .15 Bibliography 19 DIN EN ISO 15758:2014-09 EN ISO 15758:2014 (E) 2 Foreword This document (EN

22、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 Stan

23、dard 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 o

24、f 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 countr

25、ies 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, Pola

26、nd, 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. DIN EN ISO 15758:2014-09 EN ISO 15758:2014 (E) 3 IntroductionIf the thermal insu

27、lation 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 inte

28、rstitial 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

29、 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 tr

30、ansfer 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 condense

31、d 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

32、 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.DIN EN

33、ISO 15758:2014-09 EN ISO 15758:2014 (E) 4 1 ScopeThis 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 wat

34、er 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 S

35、tandard 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 referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application

36、. 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 VocabularyISO 12241, Thermal i

37、nsulation for building equipment and industrial installations Calculation rulesISO 12572, Hygrothermal performance of building materials and products Determination of water vapour transmission propertiesISO 13788, Hygrothermal performance of building components and building elements Internal surface

38、 temperature to avoid critical surface humidity and interstitial condensation Calculation methods3 Terms, definitions and symbolsFor 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) app

39、ly.3.1exposed moist areasurface area of a capillary active fabric that is exposed to the ambient atmosphere3.2vapour retardermaterial with high resistance to the flow of water vapour3.3corrected water vapour diffusion equivalent air layer thicknessthickness of an imaginary plane layer with =1, and a

40、n area of Djwhich has the same diffusion resistance as the layer j with = jNote 1 to entry: See Formula (18).DIN EN ISO 15758:2014-09 EN ISO 15758:2014 (E) 5 Table 1 Symbols and associated unitsSymbol Quantity UnitaAeSurface area from which evaporation takes place per linear metre of the pipem2/mD0O

41、utside diameter of cold pipe mDjOutside diameter of j-th layer of an insulation system mDnOutside diameter of the outer layer of an insulation system mG Total moisture uptake over a period per linear metre of pipe refer to Formula (2)kg/mG Total moisture uptake over a period per linear metre of pipe

42、 kg/mP Actual atmospheric pressure PaP0Standard atmospheric pressure = 101 325 PaRvGas constant for water vapour = 461,5 J/(kgK)T Thermodynamic temperature KZflWater vapour resistance of one thin foil, cladding or skin per linear metre of pipemsPa/kgZjWater vapour resistance of j-th layer of an insu

43、lation system per lin-ear metre of pipemsPa/kgZPWater vapour resistance of insulation system per linear metre of pipe msPa/kgd Thickness of an insulation layer mfeEvaporation factor kg/(m2sPa)g Water vapour flow rate within the insulation per linear metre of pipe kg/(ms)gcRate of condensation per li

44、near metre of pipe kg/(ms)geEvaporation rate per linear metre of pipe kg/(ms)hcConvection heat transfer coefficient W/(m2K)p Partial water vapour pressure PapaPartial water vapour pressure of air PapsatSaturated water vapour pressure PasdWater vapour diffusion equivalent air layer thickness msdfWate

45、r vapour diffusion equivalent air layer thickness of foils mt Period of calculation (month or year) Month, yearx Distance m Water vapour permeability kg/(msPa)0Water vapour permeability of air kg/(msPa)d,jCorrected water vapour diffusion equivalent air layer thickness of layer jmd, jTotal corrected

46、water vapour diffusion equivalent air layer thickness from surface of cold pipe to the outside of layer jm Water vapour resistance factor 0Temperature of the medium in the pipe CaFor practical reasons, hours or days are often used instead of seconds as units of time.DIN EN ISO 15758:2014-09 EN ISO 1

47、5758:2014 (E) 6 4 Calculation formulae4.1 GeneralThe density of water vapour flow rate, g, through a material is calculated by the following formula:gpx=dd(1)where is the water vapour permeability of the material.The total moisture uptake during a period, G, is given byGgtt=d0(2)In calculations the

48、diffusion resistance factor, , is commonly used instead of the permeability:=0(3)where 0is the water vapour permeability of still air, which can be calculated from001810 083273=,PRTPTV(4)For approximate calculations, 0can be assumed to be constant in the temperature range under consideration; the following value can therefore be used:01020 10=, (5)4.2 Homogeneous insulationIn the case of a cold pipe with a single homogeneous layer of ins