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BS EN 675:2011

Current
Current

The latest, up-to-date edition.

Glass in building. Determination of thermal transmittance (U value). Heat flow meter method
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

30-06-2011

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Basic formula
5 Brief outline of the measuring procedure
6 Test apparatus
7 Calibration of the test apparatus
8 Dimensions of the specimens
9 Preparation of the specimens
10 Performance of the measurements
11 Evaluation of the results
12 Expression of results
13 Test report
Bibliography

Describes a measurement procedure to determine the thermal transmittance of glazing with flat and parallel surfaces.

This European Standard specifies a measurement procedure to determine the thermal transmittance of glazing with flat and parallel surfaces. For the purpose of this Standard, structured surfaces may be considered to be flat..

This European Standard applies to multiple glazing with outer panes which are not transparent to far infrared radiation (in the wavelength range 5μm to 50μm), which is the case for soda lime silicate glass products, borosilicate glass and glass ceramics. Internal elements can be far infrared transparent.

The procedure specified in this European Standard determines the U value (thermal transmittance) in the central area of glazing. The edge effects due to the thermal bridge through the spacer of an insulating glass unit or through the window frame are not included. Energy transfer due to solar radiation is also excluded.

The procedure specified in this European Standard should be considered only when the thermal transmittance of the glazing cannot be calculated in accordance with EN 673.

The determination of the thermal transmittance is performed for conditions which correspond to the average situation for glazing in practice.

NOTE Patterned glass is an example of a glass with a structured surface;

Committee
B/520
DevelopmentNote
Supersedes 92/12542 DC (08/2005)
DocumentType
Standard
Pages
18
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
DIN EN 675:2011-09 Identical
EN 675:2011 Identical
NEN EN 675 : 2011 Identical
I.S. EN 675:2011 Identical
NBN EN 675 : 2011 Identical
UNI EN 675 : 2011 Identical
NF EN 675 : 2011 Identical
SN EN 675 : 2011 Identical
NS EN 675 : 2011 Identical
UNE-EN 675:1998 Identical

ISO 10211:2017 Thermal bridges in building construction — Heat flows and surface temperatures — Detailed calculations
EN 673:2011 Glass in building - Determination of thermal transmittance (U value) - Calculation method
EN 410:2011 Glass in building - Determination of luminous and solar characteristics of glazing
EN 12898:2001 Glass in building - Determination of the emissivity
EN ISO 13790:2008 Energy performance of buildings - Calculation of energy use for space heating and cooling (ISO 13790:2008)
ISO 8302:1991 Thermal insulation — Determination of steady-state thermal resistance and related properties — Guarded hot plate apparatus
ISO 8301:1991 Thermal insulation Determination of steady-state thermal resistance and related properties Heat flow meter apparatus
EN ISO 10211:2017 Thermal bridges in building construction - Heat flows and surface temperatures - Detailed calculations (ISO 10211:2017)
ISO 10077-1:2017 Thermal performance of windows, doors and shutters — Calculation of thermal transmittance — Part 1: General
ISO 13790:2008 Energy performance of buildings Calculation of energy use for space heating and cooling
EN ISO 10077-1:2017 Thermal performance of windows, doors and shutters - Calculation of thermal transmittance - Part 1: General (ISO 10077-1:2017, Corrected version 2020-02)

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