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

BS EN 674:2011

Glass in building. Determination of thermal transmittance (U value). Guarded hot plate method

Status : Current, Project Underway   Published : July 2011

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PDF

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HARDCOPY



This European 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. This European Standard 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 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. Furthermore energy transfer due to solar radiation is not taken into account. The procedure specified in this European Standard should generally only be considered when the calculation method detailed in EN 673 is inappropriate or unsuitable. The document for the calculation of the overall U value of windows, doors and shutters (see [3]) gives normative reference to the U value evaluated for the glazing components according to this standard. A vertical position of the glazing is specified. 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.




Standard NumberBS EN 674:2011
TitleGlass in building. Determination of thermal transmittance (U value). Guarded hot plate method
StatusCurrent, Project Underway
Publication Date31 July 2011
Normative References(Required to achieve compliance to this standard)EN 12898, ISO 8302:1991
Informative References(Provided for Information)EN ISO 13790, ISO 13790:2008, EN ISO 10211, EN 673, EN ISO 10077-1, EN 410, ISO 10211:2007, ISO 10077-1:2006
ReplacesBS EN 674:1998
International RelationshipsEN 674:2011
DescriptorsThermal measurement, Specimen preparation, Heat measurement, Multiple, Thermal transmittance, Heat transfer, Double glazing, Glazing, Testing conditions, Thermal resistance, Mathematical calculations, Construction systems parts, Test equipment, Glass, Test specimens, Sealed units, Reports, Thermal insulation
ICS81.040.20
Title in FrenchVerre dans la construction. Détermination du coefficient de transmission thermique, U. Méthode de l'anneau de garde
Title in GermanGlas im Bauwesen. Bestimmung des Wärmedurchgangskoeffizienten (U-Wert). Verfahren mit dem Plattengerät
CommitteeB/520/4
ISBN978 0 580 71595 2
PublisherBSI
FormatA4
DeliveryYes
Pages16
File Size497 KB
Price£130.00


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