BS 6993-2:1990
Current
The latest, up-to-date edition.
Thermal and radiometric properties of glazing Method for direct measurement of U-value (thermal transmittance)
Hardcopy , PDF
English
31-07-1990
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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.
| 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
|
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.
| 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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