1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1745:2012Masonry and masonry products Methods for determiningthermal propertiesBS EN 1745:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementati
2、on of EN 1745:2012. It supersedes BS EN 1745:2002 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/519, Masonry and associated testing.A list of organizations represented on this committee can be obtained on request to its secretary.This publication d
3、oes not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012ISBN 978 0 580 71789 5 ICS 91.080.30; 91.120.10 Compliance with a British Standard cannot confer im
4、munity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 1745:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1745 April 2012 ICS
5、 91.080.30; 91.120.10 Supersedes EN 1745:2002English Version Masonry and masonry products - Methods for determining thermal properties Maonnerie et lments de maonnerie - Mthodes pour la dtermination des proprits thermiques Mauerwerk und Mauerwerksprodukte - Verfahren zur Bestimmung von wrmeschutztec
6、hnischen EigenschaftenThis European Standard was approved by CEN on 9 March 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 lists and
7、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 re
8、sponsibility 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,
9、 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 EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NOR
10、MUNG 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 1745:2012: EBS EN 1745:2012EN 1745:2012 (E) 2 Contents Page Foreword . 4Introduction 51 Scope 72 Normative references .
11、73 Terms, definitions and symbols 73.1 Terms and definitions . 73.2 Symbols . 93.3 Subscripts 104 Procedures to determine 10,dry, unit-values for solid masonry units and 10,dry,mor-values for mortars . 114.1 General . 114.210,dry, mat-values for solid masonry units and mortars 114.2.1 Model S1. Dete
12、rmination of 10,dry,unit-values from tabulated 10,dry,mat /net dry density relation 114.2.2 Model S2. Determination of 10,dry,unit-values based on 10,dry,mat /net dry density curve . 114.2.3 Model S3. Procedures to determine 10,dry,unit-values from determining the thermal transmittance (Umas) of mas
13、onry built from solid masonry units and mortar 134.3 Test methods and numbers of samples to be taken for the different models 145 Procedures to determine equivalent 10,dry,unit-values for masonry units with formed voids and composite masonry units . 145.1 General . 145.2 Calculation methods . 155.31
14、0,dry,unit-values of masonry units 155.3.1 Determination of 10,dry,unit-values from tabulated unit /matrelation . 155.3.2 Determination of 10,dry,unit-values based on calculation . 165.3.3 Model P5. Determination of 10,dry,unit-values from determining the thermal transmittance (Umas) of masonry buil
15、t from masonry units with formed voids or composite masonry units and mortar . 165.4 Test methods and numbers of samples to be taken for the different models 196 Moisture conversion . 197 Procedures to determine design thermal values (Rdesign,masor design, mas) for masonry built from masonry units a
16、nd mortar 207.1 General . 207.2 Rdesign,mas- or design,mas-values based on calculation 207.3 Rdesign,mas- or design,mas-values of masonry built from masonry units with formed voids or composite masonry units and mortar based on tabulated values . 217.3.1 Tabulated values . 218. Determination of the
17、thermal transmittance of masonry 239. Specific heat capacity. 2310. Rounding rules for -values for masonry 23Annex A (normative) Tabulated 10,dry,mat-values of materials used for masonry products 24Annex B (informative) Rdry,mas- or 10,dry,mas-values of masonry built from a range of masonry units co
18、ntaining formed voids . 35BS EN 1745:2012EN 1745:2012 (E) 3 Annex C (informative) Example of how to use the tables in Annex B 62Annex D (normative) Requirements for appropriate calculation procedures 64D.1 Capabilities of the program . 64D.2 Input data and results . 64D.3 Testing of the program accu
19、racy 65D.4 Reference cases 65Annex E (informative) Evaluation of conformity . 73Annex F (informative) Alternative procedure for the moisture correction of units with formed voids 75Bibliography . 76BS EN 1745:2012EN 1745:2012 (E) 4 Foreword This document (EN 1745:2012) has been prepared by Technical
20、 Committee CEN/TC 125 “Masonry”, the secretariat of which is held by BSI. 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 October 2012, and conflicting national standards shall be withdrawn at the
21、 latest by October 2012. 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 1745:2002. This document has been
22、 prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. The following is a list of significant technical changes since the last edition: addition of Figure 1 to show the procedures and calculation possibilities; editorial improvement; extension of A
23、nnex B; adaption of Annex E; addition of Annex F; deletion of Annex ZA. 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, Denma
24、rk, Estonia, Finland, 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. BS EN 1745:2012EN 1745:2012 (E) 5 Introduction This Eu
25、ropean Standard provides rules for the determination of dry and design thermal conductivity and thermal resistance values of masonry products and masonry. It describes how dry thermal values are determined. It also describes the correction methods to derive design values from a dry value. The dry va
26、lue is a characteristic of a masonry material, masonry unit or of masonry. On the basis of dry thermal conductivity values determination methods of design thermal values are given. Three procedures (model S1 S3) for the determination of dry thermal conductivity (10,dry,unit) of solid masonry units a
27、re described and five procedures (model P1 P5) for the determination of equivalent dry thermal conductivity (10,dry,unit) of masonry units with formed voids and composite masonry units are described, see Figure 1. For mortars according to EN 998-1 and EN 998-2, the models S1 S2 can be used. Addition
28、ally three procedures for the determination of thermal resistance are described. These procedures are: the use of tabulated R-values; the measurement of R-value; the numerical calculation of R-value. The following major types of masonry units are covered by this European Standard: solid masonry unit
29、s; masonry units with formed voids; composite masonry units. In Figure 1, the different models and procedures are illustrated. The design value of a product characteristic is the value determined for a specific application and for use in calculations. Design thermal values are determined, according
30、to the procedure given in this European Standard according to the intended application, environmental and climatic conditions, bearing in mind the purpose of this determination, such as: energy consumption; design of heating and cooling equipment; surface temperature determination; compliance with n
31、ational building regulations; consideration of non-steady state thermal conditions in buildings. BS EN 1745:2012EN 1745:2012 (E) 6 Figure 1 Determination of thermal properties of masonry units and masonry BS EN 1745:2012EN 1745:2012 (E) 7 1 Scope This European Standard specifies procedures for the d
32、etermination of thermal properties of masonry and masonry products. 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
33、, the latest edition of the referenced document (including any amendments) applies. EN 772-4, Methods of test for masonry units Part 4: Determination of real and bulk density and of total and open porosity for natural stone masonry units EN 772-13, Methods of test for masonry units Part 13: Determin
34、ation of net and gross dry density of masonry units (except for natural stone) EN 1015-10, Methods of test for mortar for masonry Part 10: Determination of dry bulk density of hardened mortar EN 1934, Thermal performance of buildings Determination of thermal resistance by hot box method using heat f
35、low meter Masonry EN 1936, Natural stone test methods Determination of real density and apparent density, and of total and open porosity EN 12664, Thermal performances of building materials and products Determination of thermal resistance by means of guarded hot plate and heat flow meter methods Dry
36、 and moist products of medium and low thermal resistance EN ISO 6946:2007, Building components and building elements Thermal resistance and thermal transmittance Calculation method (ISO 6946:2007) EN ISO 7345:1995, Thermal insulation Physical quantities and definitions (ISO 7345:1987) EN ISO 10211,
37、Thermal bridges in building construction Heat flows and surface temperatures Detailed calculations (ISO 10211) EN ISO 10456, Building materials and products Hydrothermal properties Tabulated design values and procedures for determining declared and design thermal values (ISO 10456) 3 Terms, definiti
38、ons and symbols For the purposes of this document, the following terms, definitions and symbols and those given in EN ISO 7345:1995 apply. 3.1 Terms and definitions 3.1.1 masonry assemblage of masonry units laid in a specified pattern and joined together with masonry mortar BS EN 1745:2012EN 1745:20
39、12 (E) 8 3.1.2 masonry product masonry units, masonry mortars, rendering and plastering mortars 3.1.3 solid masonry unit masonry unit containing no perforations except external indentations such as grip holes, grooves, etc. 3.1.4 masonry unit with formed voids masonry unit with a system of intention
40、ally formed voids 3.1.5 composite masonry unit masonry unit incorporating one or more layers of additional material to enhance performance 3.1.6 thermal value common term for either the thermal conductivity W/(mK) or the thermal resistance m2K/W 3.1.7 dry state state after drying under conditions st
41、ated in the relevant standards 3.1.8 dry thermal value value of a thermal property of a building material or product in a dry state determined according to this European Standard as a basis for the calculation of design thermal values Note 1 to entry: The dry thermal value can be expressed as therma
42、l conductivity or thermal resistance. 3.1.9 design thermal value value of a thermal property of a building material or product under specific external and internal conditions which can be considered as typical of the performance of that material or product when incorporated in a building component o
43、r building 3.1.10 masonry thermal conductivity value which is derived by dividing the thickness of a given masonry element by its thermal resistance excluding surface resistance 3.1.11 reference conditions set of conditions identifying a state of equilibrium selected as the base to which the thermal
44、 values of building materials and products are referred 3.1.12 equivalent thermal conductivity value derived by dividing the width of a masonry unit with formed voids or a composite masonry unit or masonry by its thermal resistance excluding surface resistance BS EN 1745:2012EN 1745:2012 (E) 9 3.2 S
45、ymbols The order of the indices for thermal values is temperature, condition and subject Symbol Quantity Unit10,dry,matthermal conductivity at an average temperature of 10 C in dry state for the material W/(m|K) 10,dry,masthermal conductivity at an average temperature of 10 C in dry state for the ma
46、sonry W/(m|K) 10,dry,morthermal conductivity at an average temperature of 10 C in dry state for the mortar W/(m|K) 10,dry,unitthermal conductivity at an average temperature of 10 C in dry state for the unit. For solid units the 10,dry, unit is the same as 10,dry, matand for units with formed voids a
47、nd composite units the 10,dry, unit is the equivalent thermal conductivity. W/(m|K) design,masdesign thermal conductivity for the masonry W/(m|K) design,mordesign thermal conductivity for the mortar W/(m|K) design,unitdesign thermal conductivity for the unit W/(m|K) i individual measured or calculat
48、ed thermal conductivity W/(m|K) Riindividual measured thermal resistance m2|K/W Rdry,masthermal resistance of masonry m2|K/W Rdesign,mas design thermal resistance of masonry m2|K/W Rsi, Rseinternal and external surface resistance m2|K/W Rt,masthe true thermal resistance of the masonry m2|K/W amorper
49、centage area of mortar joint in the measured masonry % aunitpercentage area of units in the measured masonry % d thickness of the masonry m T temperature K water vapour diffusion coefficient cpspecific heat capacity J/(kgK) l length of a masonry unit mm w width of a masonry unit mm hunitheight of a masonry unit mm BS EN 1745:2012EN 1745:2012 (E) 10 hmorthickne
