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## Glass and thermal insulation 2008

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**Glass and thermal insulation**2008 Technical Advisory Service**Thermal**Insulation Acoustic Insulation Solar Control Safety Aesthetic and decoration**Glass and thermal insulation**• Introduction • Convection, conduction and radiancy • Single glazing • Double glazing • Low e double glazing • Temperature of surface and comfort • AGC Flat Glass Europe range • Condensation • Calculation of the Ug-value of a glazing • Calculation of the Uw-value of a window • Regulation**Introduction**Heat high t° low t°**Introduction**20°C Necessary power ? 0°C P = S (m²) x DT (°C) x Ug (W/m² °C)**Glass and thermal insulation**• Introduction • Convection, conduction and radiancy • Single glazing • Double glazing • Low e double glazing • Temperature of surface and comfort • AGC range • Condensation • Calculation of the Ug-value of a glazing • Calculation of the Uw-value of a window • Regulation**Conduction, convection and radiancy**Conduction Convection Radiancy**Conduction, convection and radiancy**Heat loss Ug-value = (W/m².K) Temperature difference Outdoor temperature : Tout Indoor temperature : Tin Radiation Radiation Conduction Convection (and conduction) Convection (and conduction)**Conduction, convection and radiancy**Energy UV Light Short infra red Intensity(W/m²) 1.5 1.0 0.5 0 2500 280 380 780 0 Wavelength (nm)**Conduction, convection and radiancy**Solar spectrum : UV : 280 tot 380 nm 5% energy Light : 380 tot 780 nm 50% energy Short I.R. : 780 tot 2500 nm 45% energy**Conduction, convection and radiancy**Solar radiancy Radiators Close IR Radio waves Visible Long IR**Glass and thermal insulation**• Introduction • Convection, conduction and radiancy • Single glazing • Double glazing • Low e double glazing • Temperature of surface and comfort • AGC range • Condensation • Calculation of the Ug-value of a glazing • Calculation of the Uw-value of a window Regulation**Single glazing**4 glass = 1 W/(m K) alu = 160 W/(m K) insulating material 0,065 W/(m K) : thermal conductivity**Single glazing**19 mm Ug = 5,4 W/(m² K) 4 glass = 1 W/(m² K) insulator < 0,065 W/(m² K) Ug = 5,8 W/(m² K)**Single glazing**5,8 5,4**Single glazing**700 mm Ug = 1.1 W/(m² K)**Glass and thermal insulation**• Introduction • Convection, conduction and radiancy • Single glazing • Double glazing • High output double glazing • Temperature of surface and comfort • AGC range • Condensation • Calculation of the Ug-value of a glazing • Calculation of the Uw-value of a window • Regulation**Double glazing**glass = 1 W/(m² K) air = 0,025 W/(m² K) Ug = 5,8 W/(m² K) Ug = 2,9 W/(m² K)**Double glazing**2,9**Double glazing - composition**Thermobel Air Float Float Butyl Spacer Dryer Sealing**Double glazing - composition**• 2 glazings • Spacer • Gas • Dryer for absorbing humidity • Primary barrier of sealing (humidity) : • Butyl • Secondary barrier of sealing (sealing) : • Polyurethane • Silicone**Double glazing**Ar Kr Ug = 2,9 W/(m² K) Ug 2,6 W/(m² K)**Double glazing**Ug = 2,9 W/(m² K) Ug 2,0 W/(m² K)**Glass and thermal insulation**• Introduction • Convection, conduction and radiancy • Single glazing • Double glazing • Low edouble glazing • Temperature of surface and comfort • AGC range • Condensation • Calculation of the Ug-value of a glazing • Calculation of the Uw-value of a window • Regulation**Double glazing**Outside Inside UV, visible, short IR Long IR > 2500 nm**Double glazing**Long IR > 2500 nm en=0.89 en =0.89**Double glazing**• Glass is not transparent to long IR • Glass then absorbs the heat which tries to leave the building • In winter, when it is colder outside than inside, the major part ofthis absorptive energy is re-emitted towards outside**Low e double glazing**Heat LowE coating Ug = 2,9 W/(m² K) Ug = 1,4 to 2,0 W/(m² K)**Low e double glazing**Low emissivity coating : n=0.15 to 0.02 Long IR > 2500 nm en =0.89**Low e double glazing**UV, visible, short IR Long IR > 2500 nm en =0.89**Low e double glazing**• The low-e coating forces the reemission of the absorbed heat by glass towards the interior • I.e. that it behaves as a mirror which reflects the heat which tries to leave the building • On the other hand, it does not prevent the solar radiation frompenetrating in the building**Low e double glazing**• Physically : • Glass is opaque to long IR (ET = 0) • From where the result of a heating of glass and reemission • The low-e coating forces the reeimisson towards outside • = AE = 1 – TR – RE = 1 – RE • The lower is emissivity, the higher is the energy reemission towards the interior**Low e double glazing**Clear glazing : emissivity e = 0,89 Coatings : • pyrolithic low-e: e about 0,15 to 0,30 • Vacuum(magnetron): e about 0,02 à 0,1**Low e double glazing**e = 0,89 e = 0,15 e = 0,05**Double glazing with Warm Edge spacer**The metallic spacer (alu, steel, …) is replaced by a plastic spacer (eventually reinforced).**Double glazing with Warm Edge spacer**Advantages: • Improvement of the U-value of the frame (not the glazing) economy of energy • The surface temperature is more uniform better comfort Without Warm Egde With Warm Edge**Low e double glazing**In short : • Thickness of glass : insignificant • Gas (argon): small improvement • Low emissivity coatings Big improvement Low e double glazing • Warm-Edge spacer Improvement of the insulation of the frame**Double glazing**Ar Ug = 5,8 W/(m² K) Ug = 2,9 W/(m² K) Ug from 1,4 to 2,0 W/(m² K) Ug = 1,1W/(m² K) In short :**Triple glazing**Ar Kr Ar Kr Ug from 0,5 to 0,9 W/(m² K)**Thermal losses of a dwelling...**Roof : 20% Walls : 25% Ground : 20% Windows account for about 35% !**Glass and thermal insulation**• Introduction • Convection, conduction and radiancy • Single glazing • Double glazing • Low e double glazing • Temperature of surface and comfort • AGC range • Condensation • Calculation of the Ug-value of a glazing • Calculation of the Uw-value of a window • Regulation**Temperature of surface and comfort**20° 18,5° 17,3° 12,8° 5,6° 0° Thermobel Triple 4-15 ar-4 -15 ar-4Ug = 0,6 Planibel 4 mm Ug =5,8 Thermobel 4-12-4 mm Ug = 2,9 Thermobel Top N+ 4-15 ar-4 mm Ug = 1,1 Inside Outside**Glass and thermal insulation**• Introduction • Convection, conduction and radiancy • Single glazing • Double glazing • Low e double glazing • Temperature of surface and comfort • AGC range • Condensation • Calculation of the Ug-value of a glazing • Calculation of the Uw-value of a window • Regulation**1970 1980 1990 2000**1970 1980 1990 2000 Technology Dial Sputtering Lodelinsart Magnetron sputtering Lodelinsart / Tiel / Teplice Pyrolytic (Spray) Moustier Pyrolytic (CVD) Moustier Gold Thermoplus Single silver Thermobel (Plus, Top, Top N, Energy) Top N+, Top NT, Energy N Thermoplus Comfort K Glass Planibel G**AGC range – Thermobel**• Ug = 2,8 W/m²K • LT = 81 % - SF = 77 % • Dimensions max : 3210 mm x 6000 mm • Thicknesses : 4 to 19 mm • Processings : tempering, laminating, silk screening, bending**AGC range – Thermobel**Alternatives • Thermobel cross bars • Thermobel luxaclair**AGC range – Thermobel Top N+**• LT = 78 % - SF = 60 % • Top N+ (ar): Ug = 1,3 – 1,1 W/m²K • Dimensions max: 3210 mm x 6000 mm • Standard thicknesses: 4 - 5 - 6 - 8 - 10 - 12 mm • Processings: laminating