BS 6993-1:1989
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Thermal and radiometric properties of glazing Method for calculation of the steady state U-value (thermal transmittance)
Hardcopy , PDF
01-02-2003
English
28-02-1989
Important note : Users cannot be edited or removed once added to your Multi user PDF.
Foreword
Committees responsible
Method
1 Scope
2 Definitions
3 Symbols
4 Basic equations
5 Basic material properties
6 Exterior and interior heat transfer coefficients
7 Standardized values
8 Accuracy
Appendices
A Emissivity
B Gas properties
C Heat transfer coefficients
D Examples of U-value calculation for standardized
values
Tables
1 Values of constant C and exponent n
2 Effective emissivity and inter-surface emittance for
one surface glass, one coated low-emissivity surface
3 Effective emissivity and inter-surface emittance for
two similarly coated low-emissivity surfaces
4 Hemispherical emissivity, epsilon h
5 Gas properties at 283 K mean
6 Exterior heat transfer coefficients
7 Interior heat transfer coefficients
Figure
1 Variation of U-value with normal emissivity of air
and argon filled glazing units of 6 mm glass
Method for calculating the U-value in the central area of single, double and multiple glazing with uncoated or two coated low-emissivity surfaces bounding the spaces.
| Committee |
B/540
|
| DocumentType |
Standard
|
| Pages |
14
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
| BS 6993-2:1990 | Thermal and radiometric properties of glazing Method for direct measurement of U-value (thermal transmittance) |
| BS 874-1:1986 | Methods for determining thermal insulating properties Introduction, definitions and principles of measurement |
| BS 874-3.1:1987 | Methods for determining thermal insulating properties. Tests for thermal transmittance and conductance Guarded hot-box method |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.