BS EN 674:2011 Glass in building. Determination of thermal transmittance (U value). Guarded hot plate method

Abbreviation
BS EN 674:2011
Valid from
31/07/2011

Information provider
British Standards Institution,
Author
British Standards Institution
European Standardization Organisations
Information type
British Standard,
Format
PDF, HARD COPY,


Description

This Standard specifies a measurement method to determine the thermal transmittance of glazing with flat and parallel surfaces. Structured surfaces, e.g. patterned glass, can be considered to be flat.

It applies to multiple glazing with outer panes which are not transparent to far infrared radiation, which is the case for soda lime silicate glass products, borosilicate glass and glass ceramics. Internal elements may be far infrared transparent.

The procedure specified in this 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. Furthermore energy transfer due to solar radiation is not taken into account.

The procedure specified in this Standard should generally only be considered when the calculation method detailed in EN 673 is inappropriate or unsuitable.

U values evaluated according to the present standard are used for product comparison as well as for other purposes, in particular for predicting:

  • heat loss through glazing;
  • conduction heat gains in summer;
  • condensation on glazing surfaces;
  • the effects of the absorbed solar radiation in determining the solar factor (see [1]).

Reference should be made to [4], [5], or other European Standards dealing with heat loss calculations for the application of glazing U values determined by this standard.

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

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BS EN 674:2011 Glass in building. Determination of thermal transmittance (U value). Guarded hot plate method

This document is CITED BY:

BS EN 674:2011 Glass in building. Determination of thermal transmittance (U value). Guarded hot plate method

Description

This Standard specifies a measurement method to determine the thermal transmittance of glazing with flat and parallel surfaces. Structured surfaces, e.g. patterned glass, can be considered to be flat.

It applies to multiple glazing with outer panes which are not transparent to far infrared radiation, which is the case for soda lime silicate glass products, borosilicate glass and glass ceramics. Internal elements may be far infrared transparent.

The procedure specified in this 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. Furthermore energy transfer due to solar radiation is not taken into account.

The procedure specified in this Standard should generally only be considered when the calculation method detailed in EN 673 is inappropriate or unsuitable.

U values evaluated according to the present standard are used for product comparison as well as for other purposes, in particular for predicting:

  • heat loss through glazing;
  • conduction heat gains in summer;
  • condensation on glazing surfaces;
  • the effects of the absorbed solar radiation in determining the solar factor (see [1]).

Reference should be made to [4], [5], or other European Standards dealing with heat loss calculations for the application of glazing U values determined by this standard.

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

View on Information Provider website
BS EN 674:2011 Glass in building. Determination of thermal transmittance (U value). Guarded hot plate method
Description

This Standard specifies a measurement method to determine the thermal transmittance of glazing with flat and parallel surfaces. Structured surfaces, e.g. patterned glass, can be considered to be flat.

It applies to multiple glazing with outer panes which are not transparent to far infrared radiation, which is the case for soda lime silicate glass products, borosilicate glass and glass ceramics. Internal elements may be far infrared transparent.

The procedure specified in this 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. Furthermore energy transfer due to solar radiation is not taken into account.

The procedure specified in this Standard should generally only be considered when the calculation method detailed in EN 673 is inappropriate or unsuitable.

U values evaluated according to the present standard are used for product comparison as well as for other purposes, in particular for predicting:

  • heat loss through glazing;
  • conduction heat gains in summer;
  • condensation on glazing surfaces;
  • the effects of the absorbed solar radiation in determining the solar factor (see [1]).

Reference should be made to [4], [5], or other European Standards dealing with heat loss calculations for the application of glazing U values determined by this standard.

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

View on Information Provider website
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BS EN 674:2011 Glass in building. Determination of thermal transmittance (U value). Guarded hot plate method

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