DIN EN ISO 13788-2013 Hygrothermal performance of building components and building elements - Internal surface temperature to avoid critical surface humidity and interstitial conde.pdf

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1、May 2013 Translation by DIN-Sprachendienst.English price group 19No 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).ICS 91

2、.120.10; 91.120.30!%#vU“2008350www.din.deDDIN EN ISO 13788Hygrothermal performance of building components and buildingelements Internal surface temperature to avoid critical surface humidity andinterstitial condensation Calculation methods (ISO 13788:2012);English version EN ISO 13788:2012,English t

3、ranslation of DIN EN ISO 13788:2013-05Wrme- und feuchtetechnisches Verhalten von Bauteilen und Bauelementen Raumseitige Oberflchentemperatur zur Vermeidung kritischer Oberflchenfeuchte undTauwasserbildung im Bauteilinneren Berechnungsverfahren (ISO 13788:2012);Englische Fassung EN ISO 13788:2012,Eng

4、lische bersetzung von DIN EN ISO 13788:2013-05Performance hygrothermique des composants et parois de btiments Temprature superficielle intrieure permettant dviter lhumidit superficielle critique etla condensation dans la masse Mthodes de calcul (ISO 13788:2012);Version anglaise EN ISO 13788:2012,Tra

5、duction anglaise de DIN EN ISO 13788:2013-05SupersedesDIN EN ISO 13788:2001-11www.beuth.deDocument comprises 84 pagesIn case of doubt, the German-language original shall be considered authoritative.04.13DIN EN ISO 13788:2013-05 2 A comma is used as the decimal marker. National foreword This document

6、 (EN ISO 13788:2012) 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” (Secretariat: SIS, Sweden). The responsible German bod

7、y involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Working Committee NA 005-56-99 AA Feuchte. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 6946 DIN EN ISO 6946 ISO 934

8、6 DIN EN ISO 9346 ISO 10077-2 DIN EN ISO 10077-2 ISO 10211 DIN EN ISO 10211 ISO 10456 DIN EN ISO 10456 ISO 12572 DIN EN ISO 12572 ISO 13370 DIN EN ISO 13370 ISO 13790 DIN EN ISO 13790 ISO 15927-1 DIN EN ISO 15927-1 Amendments This standard differs from DIN EN ISO 13788:2001-11 as follows: a) Clause

9、7 “Calculation of drying of building components” has been added; b) Annexes ZA and ZB have been deleted; c) the standard has been revised in form and substance. Previous editions DIN 4108: 1952xx-07, 1960-05, 1969-08 DIN 4108-1: 1981-08 DIN 4108-3: 1981-08, 2001-07 DIN 4108-5: 1981-08 DIN EN ISO 137

10、88: 2001-11 DIN EN ISO 13788:2013-05 3 National Annex NA (informative) Bibliography DIN EN ISO 6946, Building components and building elements Thermal resistance and thermal transmittance Calculation method DIN EN ISO 9346, Hygrothermal performance of buildings and building materials Physical quanti

11、ties for mass transfer Vocabulary DIN EN ISO 10077-2, Thermal performance of windows, doors and shutters Calculation of thermal transmittance Part 2: Numerical method for frames DIN EN ISO 10211, Thermal bridges in building construction Heat flows and surface temperatures Detailed calculations DIN E

12、N ISO 10456, Building materials and products Hygrothermal properties Tabulated design values and procedures for determining declared and design thermal values DIN EN ISO 12572, Hygrothermal performance of building materials and products Determination of water vapour transmission properties DIN EN IS

13、O 13370, Thermal performance of buildings Heat transfer via the ground Calculation methods DIN EN ISO 13790, Energy performance of buildings Calculation of energy use for space heating and cooling DIN EN ISO 15927-1, Hygrothermal performance of buildings Calculation and presentation of climatic data

14、 Part 1: Monthly and annual means of single meteorological elements DIN EN ISO 13788:2013-05 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 13788 December 2012 ICS 91.060.01; 91.120.10 Supersedes EN ISO 13788:2001English Version Hygrothermal performance o

15、f building components and building elements - Internal surface temperature to avoid critical surface humidity and interstitial condensation - Calculation methods (ISO 13788:2012) Performance hygrothermique des composants et parois de btiments - Temprature superficielle intrieure permettant dviter lh

16、umidit superficielle critique et la condensation dans la masse - Mthodes de calcul (ISO 13788:2012) Wrme- und feuchtetechnisches Verhalten von Bauteilen und Bauelementen - Raumseitige Oberflchentemperatur zur Vermeidung kritischer Oberflchenfeuchte und Tauwasserbildung im Bauteilinneren - Berechnung

17、sverfahren (ISO 13788:2012) This European Standard was approved by CEN on 28 December 2012. 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

18、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 un

19、der 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

20、 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 COMIT EU

21、ROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 13788:2012: EContents PageForeword Introduction 1 Scope .2 Normativ

22、e references 3 Terms and definitions, symbols and units .3.1 Terms and definitions .3.2 Symbols and units 3.3 Subscripts 4 Input data for the calculations .4.1 Material and product properties .4.2 External boundary conditions .4.3 Internal boundary conditions .4.4 Surface resistances .5 Calculation

23、of surface temperature to avoid critical surface humidity 5.1 General 5.2 Determining parameters .5.3 Design for avoidance of mould growth, corrosion or other moisture damage.5.4 Design for the limitation of surface condensation on low thermal inertia elements .6 Calculation of interstitial condensa

24、tion 6.1 General 6.2 Principle .6.3 Limitation of sources of error . 146.4 Calculation . 146.5 Criteria used to assess building components 7 Calculation of drying of building components .7.1 General 7.2 Principle .7.3 Specification of the method 7.4 Criteria used to assess drying potential of buildi

25、ng components Annex A (informative) Internal boundary conditions .Annex B (informative) Examples of calculation of the temperature factor at the internal surfacetoavoid critical surface humidity 24Annex C (informative) Examples of calculation of interstitial condensation 28Annex D (informative) Exam

26、ple of the calculation of the drying of a wetted layer .38Annex E (informative) Relationships governing moisture transfer and water vapour pressure .Bibliography .4DIN EN ISO 13788:2013-05 EN ISO 13788:2012 (E) 2345555788881010111111111213131320202021212122414Foreword This document (EN ISO 13788:201

27、2) 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

28、 given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2013, and conflicting national standards shall be withdrawn at the latest by June 2013. Attention is drawn to the possibility that some of the elements of this document may b

29、e 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 ISO 13788:2001. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to

30、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, Rom

31、ania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 13788:2012 has been approved by CEN as a EN ISO 13788:2012 without any modification. DIN EN ISO 13788:2013-05 EN ISO 13788:2012 (E) 3 IntroductionMoisture transfer is a very comple

32、x process and the knowledge of moisture transfer mechanisms, material properties, initial conditions and boundary conditions is often limited. Therefore this International Standard lays down simplified calculation methods, which assume that moisture transport is by vapour diffusion alone and use mon

33、thly climate data. The standardization of these calculation methods does not exclude use of more advanced methods. If other sources of moisture, such as rain penetration or convection, are negligible, the calculations will normally lead to designs well on the safe side and if a construction fails a

34、specified design criterion according to this procedure, more accurate methods may be used to show that the design will pass.This International Standard deals with:a) the critical surface humidity likely to lead to problems such as mould growth on the internal surfaces of buildings,b) interstitial co

35、ndensation within a building component, in: heating periods, where the internal temperature is usually higher than outside; cooling periods, where the internal temperature is usually lower than the outside; cold stores, where the internal temperature is always lower than outside.c) an estimate of th

36、e time taken for a component, between high vapour resistance layers, to dry, after wetting from any source, and the risk of interstitial condensation occurring elsewhere in the component during the drying process.This International Standard does not cover other aspects of moisture, e.g. ground water

37、 and ingress of precipitation.In some cases, airflow from the interior of the building into the structure is the major mechanism for moisture transport, which can increase the risk of condensation problems very significantly. This International Standard does not address this issue; where it is felt

38、to be important, more advanced assessment methods should be considered.The limitations on the physical processes covered by this International Standard mean that it can provide a more robust analysis of some structures than others. The results will be more reliable for lightweight, airtight structur

39、es that do not contain materials that store large amounts of water. They will be less reliable for structures with large thermal and moisture capacity and which are subject to significant air leakage.DIN EN ISO 13788:2013-05 EN ISO 13788:2012 (E) 41 ScopeThis International Standard gives simplified

40、calculation methods for:a) The internal surface temperature of a building component or building element below which mould growth is likely, given the internal temperature and relative humidity. The method can also be used to assess the risk of other internal surface condensation problems.b) The asse

41、ssment of the risk of interstitial condensation due to water vapour diffusion. The method used does not take account of a number of important physical phenomena including: the variation of material properties with moisture content; capillary suction and liquid moisture transfer within materials; air

42、 movement from within the building into the component through gaps or within air spaces; the hygroscopic moisture capacity of materials.Consequently, the method is applicable only where the effects of these phenomena can be considered to be negligible.c) The time taken for water, from any source, in

43、 a layer between two high vapour resistance layers to dry out and the risk of interstitial condensation occurring elsewhere in the component during the drying process.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references

44、, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6946:2007, Building components and building elements Thermal resistance and thermal transmittance Calculation methodISO 9346, Hygrothermal performance of bui

45、ldings and building materials Physical quantities for mass transfer VocabularyISO 15927-1, Hygrothermal performance of buildings Calculation and presentation of climatic data Part 1: Monthly means of single meteorological elements3 Terms and definitions, symbols and units3.1 Terms and definitionsFor

46、 the purposes of this document, the terms and definitions given in ISO 9346 and the following apply.DIN EN ISO 13788:2013-05 EN ISO 13788:2012 (E) 5 3.1.1monthly mean temperaturemean temperature calculated from hourly values or the daily maximum and minimum temperature over a month3.1.2temperature f

47、actor at the internal surfacedifference between the temperature of the internal surface and the external air temperature, divided by the difference between the internal operative temperature and the external air temperature, calculated with a surface resistance at the internal surface Rsi:fRsisi eie

48、=Note 1 to entry: The operative temperature is taken as the arithmetic mean value of the internal air temperature and the mean radiant temperature of all surfaces surrounding the internal environment.Note 2 to entry: Methods of calculating the temperature factor in complex constructions are given in

49、 ISO 10211.3.1.3design temperature factor at the internal surfaceminimum acceptable temperature factor at the internal surface:fRsi,minsi,min eie=3.1.4minimum acceptable temperaturelowest internal surface temperature before mould growth may start3.1.5mean annual minimum temperaturemean of the lowest temperature recorded i

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