BS EN 1745:2020
$215.11
Masonry and masonry products. Methods for determining thermal properties
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 98 |
This document specifies methods for the determination of thermal properties of masonry and masonry products.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 10 | 1 Scope 2 Normative references |
| 11 | 3 Terms, definitions and symbols 3.1 Terms and definitions |
| 12 | 3.2 Symbols |
| 13 | 4 Determination of λ10,dry, unit –values for solid masonry units and λ10,dry,mor –values for mortars 4.1 General |
| 14 | 4.2 λ10,dry, mat –values for solid masonry units and mortars 4.2.1 Method S1. Determination of λ10,dry,unit –values from tabulated λ10,dry,mat /net dry density relationship 4.2.2 Method S2. Determination of λ10,dry,unit –values based on λ10,dry,mat /net dry density curve 4.2.2.1 General 4.2.2.2 Test specimens 4.2.2.3 Conditioning of specimens 4.2.2.4 Test measurement 4.2.2.5 Establishing a product related λ10,dry,mat /net dry density-curve |
| 16 | 4.2.3 Method S3. Determination of λ10,dry,unit –values from determining the thermal transmittance (Umas) of masonry built from solid masonry units and mortar 4.2.3.1 General 4.2.3.2 Testing procedure |
| 17 | 4.2.3.3 The determination of the λ10,dry,unit –value |
| 18 | 4.3 Test methods and numbers of samples to be taken 5 Determination of equivalent λ10,dry,unit -values for masonry units with formed voids and composite masonry units 5.1 General |
| 19 | 5.2 Calculation methods 5.3 λ10,dry,unit -values of masonry units with formed voids and composite units 5.3.1 Determination of λ10,dry,unit -values from tabulated λunit /λmat relationship 5.3.1.1 General 5.3.1.2 Application of Annex B 5.3.1.3 Method P1. Determination of λ10,dry,unit -values using Annex B using measured thermal conductivity of the masonry unit material 5.3.1.4 Method P2. Determination of λ10,dry,unit-values using Annex B using tabulated value from Annex A |
| 20 | 5.3.2 Determination of λ10,dry,unit-values based on calculation 5.3.2.1 General 5.3.2.2 Method P3. Determination of λ10,dry,unit –values using measured thermal conductivity of the masonry unit materials 5.3.2.3 Method P4. Determination of λ10,dry,unit –values using tabulated value from Annex A 5.3.3 Method P5. Determination of λ10,dry,unit –values from determining the thermal transmittance (Umas) of masonry built from masonry units with formed voids or composite masonry units and mortar 5.3.3.1 General 5.3.3.2 Testing procedure |
| 21 | 5.3.3.3 The determination of the λ10,dry,unit –value |
| 23 | 5.4 Test methods and numbers of samples to be taken |
| 24 | 6 Moisture conversion 6.1 General 6.2 Procedure A (for materials, mortar, solid masonry units and masonry): |
| 25 | 6.3 Procedure B (for masonry units with formed voids): 6.4 Procedure C (for composite masonry units): 7 Determination of design thermal values (Rdesign,mas or λdesign,mas) for masonry built from masonry units and mortar 7.1 General |
| 26 | 7.2 Rdesign,mas – or λdesign,mas –values based on calculation 7.2.1 Rdesign,mas – or λdesign,mas –values based on λdesign –values for the masonry units and the mortar 7.2.2 Rdesign,mas –or λdesign,mas –values using a numerical calculation method based on the design thermal conductivity of the materials used 7.3 Rdesign,mas – or λdesign,mas –values of masonry built from masonry units with formed voids and mortar based on tabulated values 7.3.1 Tabulated values |
| 27 | 7.3.2 Application of Annex B 7.3.3 Alternative application of Annex B |
| 28 | 7.4 Method S4/P6 Rdesign,mas – or λdesign,mas –values of masonry based on masonry testing 8 Determination of the thermal transmittance of masonry |
| 29 | 9 Specific heat capacity 10 Rounding rules for λ-values for masonry units and masonry |
| 30 | Annex A (normative)Tabulated λ10,dry,mat -values of materials used for masonry products |
| 40 | Annex B (informative)Rdry,mas – or λ10,dry,mas -values of masonry built from a range of masonry units containing formed voids |
| 80 | Annex C (informative)Example of how to use the tables in Annex B |
| 82 | Annex D (normative)Requirements for appropriate calculation procedures D.1 Capabilities of the program D.2 Input data and results |
| 83 | D.3 Testing of the program accuracy D.4 Reference cases D.4.1 Case 1: Calculation of thermal resistance R and thermal conductivity λ10,dry,unit of a masonry unit (vertically perforated unit) |
| 85 | D.4.2 Case 2: Calculation of thermal resistance Rdry,mas of masonry consisting of vertically perforated masonry units, bed joints with mortar layers and internal/ external plaster layers |
| 87 | D.4.3 CASE 3: Calculation of thermal resistance Rt of masonry consisting of masonry units, horizontal mortar layers, vertical mortar pockets and additional external insulation layer |
| 91 | Annex E (informative)Assessment and verification of constancy of performance |
| 93 | Annex F (informative)Alternative procedure for the moisture correction of units with formed voids |
| 94 | Annex G (informative)Simplified methodology for determining design moisture content of composite masonry units |
