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Glass: Building Envelope : 

Glass: Building Envelope Mumbai 30th June 2004 © Copyright Saint-Gobain Glass 2004

Structure: 

Structure Building Envelope: Why Glass? Features of glass Performance Day Lighting: Light Transmission Energy Saving: Reducing Heat Gain Types of products available in market Design Considerations Conclusion

Building Envelope: Why Glass?: 

Building Envelope: Why Glass? 1

Building Envelope: Why Glass?: 

Building Envelope: Why Glass? Blends interiors with exteriors: substantially improves the productivity of occupants Transparent: day light for the interiors Less load than traditional envelopes: lighter super structure thus lighter foundation Better performance on seismic loads: Higher stability

Building Envelope: Why Glass?: 

Building Envelope: Why Glass? Glass is an unique building material which combines both aesthetics & functional benefits

Features of Glass Performance: 

Features of Glass Performance 2

LIGHT TRANSMISSION: Percentage of incident light transmitted : 

LIGHT TRANSMISSION: Percentage of incident light transmitted Day Lighting: Light Transmission (LT) Incident Sun Light

Electromagnetic Spectrum at Terrestrial Level : 

Solar Thermal SUN Heated Bodies on Earth Energy Saving: Reducing Total Heat Gain Electromagnetic Spectrum at Terrestrial Level

Electromagnetic Spectrum at Terrestrial Level : 

Energy Saving: Reducing Total Heat Gain Electromagnetic Spectrum at Terrestrial Level TOTAL HEAT GAIN Heat Gain due to direct solar radiation Amount of heat Transferred due to temperature difference

Slide10: 

incident solar radiation 1# 2# reflected energy re-emitted energy re-emitted energy directly transmitted energy Heat gain due to Direct solar radiation directly + re-emitted energy = Solar Heat Gain Coefficient (SHGC)

Slide11: 

Area = 1 m2 T1 = 1oC T2 = 0oC U = 5.7 W/sqm K Amount of heat Transferred due to temperature difference U Value

Types of Products available: 

Types of Products available 3

Types of Products Available:: 

Types of Products Available: Clear Glass Body Tinted Glass Coated Glass Solar Control Coatings Low e Coatings Solar Control + Low e Coatings

Performance Range of Various Products:: 

Performance Range of Various Products: Note: Performance data of selected products shown for indicative purposes All combinations in double glazed unit with 12mm Air Gap and second glass as clear U value summer as per Ashrae, In all cases, 6mm glass with coating position Face 2

Types of coatings:: 

Best option would be a combination Types of coatings: On Line / Hard Coatings Off Line / Soft Coatings Temperable Soft Coatings

Design Consideration: 

Design Consideration 4

Slide17: 

Natural lighting / Venetian blinds Nature of building Glazing Area Vs Light Transmission : > 50% : LT: 15% to 20% > 20% but < 50%: LT: 20% to 30% < 20%: LT: 30% to 60% Day Lighting: Light Transmission (LT)

Slide18: 

Solar incident energy = 800 W Temperature differential = 20º C Solar Factor of glass is: 0.3 U Value of DGU : 3 240 Watts 60 Watts Total Heat Gain = 300 Watts Optimise Energy Performance

Reducing Heat Gain: Tropical Countries : 

Reducing Heat Gain: Tropical Countries U Value X Temperature difference Solar Factor X Amount of Solar Energy Incident Reducing: Solar Factor Optimise Energy Performance

Conclusion: 

Conclusion 4

Glass: Building Envelope: 

Glass: Building Envelope Indoor Environment Quality a. Glass helps in day lighting the interiors b. Glass helps in blending interiors with nature c. Studies prove that openness have an impact on productivity Materials & Resources a. Glass is recyclable b. No harmful byproducts of manufacture Energy & Atmosphere a. Solar Factor b. Double glazing c. Low e Innovation: self cleaning & noise control glasses

Thank You : 

Thank You reflective.glass@saint-gobain.co.in