Thermal and radiometric properties of glazing Method for direct measurement of U-value (thermal transmittance)

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-07-1990

Publisher

British Standards Institution

Foreword
Committees responsible
Method
1 Scope
2 Definitions
3 Symbols
4 Equipment
5 Conditions for test
6 Determination of measurements following calibration
Appendices
A Values to be used in U-value calculations
B Worked example of correction to standardized total
surface resistance
Figures
1 Location of test element in surround panel
2 Interpolation of total average surface resistances

Method for measuring the transmittance of the central area of single, double or multiple glazing using hot box apparatus complying with BS 874-3.1. The edge effect due to the thermal bridge through the spacer of double or multiple glazing is effectively eliminated by this method.

This Part of BS 6993 describes a method for measuring the U-value (thermal transmittance) of the central area of single, double or multiple glazing using hot-box apparatus complying with BS 874-3.1. The edge effect, due to the thermal bridge through the spacer of double or multiple glazing, is effectively eliminated in this method.

The method is designed to measure the U-value of the glazing alone, i.e. the glass (or alternative glazing material) and any enclosed air space, and the additional information required in the test reports of clause 8 and A.9 of BS 874-3.1:1987.

Appendix A specifies values to be used in the calculation of a U-value in accordance with BS 6993-1, when such a calculated value is to be compared with that obtained by direct measurement in accordance with this Part of BS 6993.

Appendix A gives a worked example, which illustrates the use of this Part of BS 6993.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.

Committee	B/540
DevelopmentNote	Supersedes 88/13482 DC (09/2005) Reviewed and confirmed by BSI, March 2013. (03/2013)
DocumentType	Standard
Pages	14
PublisherName	British Standards Institution
Status	Current

BS 874-2.1:1986	Methods for determining thermal insulating properties. Tests for thermal conductivity and related properties Guarded hot-plate method
BS 874-1:1986	Methods for determining thermal insulating properties Introduction, definitions and principles of measurement
BS 6993-1:1989	Thermal and radiometric properties of glazing Method for calculation of the steady state U-value (thermal transmittance)
BS 874-3.1:1987	Methods for determining thermal insulating properties. Tests for thermal transmittance and conductance Guarded hot-box method

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BS 6993-2:1990

Thermal and radiometric properties of glazing Method for direct measurement of U-value (thermal transmittance)

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