Fraunhofer Institute for Building Physics
Test facility for determination of Ug especially for existing glazings
| Measurement | Ug according to DIN EN 673 (thermal transmittance coefficient), based on analysis of filling gas or residual oxygen, thermal emissivity, construction of glazing |
| Standard | DIN EN 673 (alternative procedure to DIN EN 674, DIN EN 675) |
| Measurement object | multiple glazing with 2 to 5 individual panes, thermal insulation glazing, solar control glazing, post-control of already existing glazings |
Technical data
| Test specimen dimensions | Any dimensions |
| Analysis of filling gas | Determination of air, argon and krypton in the gap between the panes (0 to 100 %) by means of analysis of residual oxygen and thermal conductivity detector |
| Emissivity | 0.02 to 0.99 % |
| Ug |
0.3 to 3.0 W/(m²K) |
Special features
| Special dimensions | This procedure is particularly suitable for glazings, which doesn’t comply to standard parameters of measuring in the Hot Plate Apparatus or Hot Box |
| Installation | Due to the combination of calculation and measuring, the real mounting position can be considered by the calculation |
| Acceptance testing | Verification of the actual glazing quality during acceptance of construction |