SLIDE 1
Cardinal Glass Divisions
- FG: flat glass
- TG: tempered (safety) glass
- CG: coated glass (low-E)
- LG: laminated glass (safety & hurricane)
- IG: insulating glass (2 and 3 pane units)
Knowledge Seminar Series : High Performance Glass October 18, 2017 - - PowerPoint PPT Presentation
Knowledge Seminar Series : High Performance Glass October 18, 2017 - - PowerPoint PPT Presentation
Knowledge Seminar Series : High Performance Glass October 18, 2017 Jim Larsen Director, Technology Marketing Cardinal Glass Divisions FG: flat glass TG: tempered (safety) glass CG: coated glass (low-E) LG: laminated glass
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Winnipeg Glass Design Priorities
- Cold weather: Design for low U-Factor
– Reduce heat loss – Warmer glass surface at winter night
- Winter sun on South elevation
– Potential for passive design
- Summer sun on East & West elevations
– Beware discomfort due to overheat
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5 months below freezing
SLIDE 5
5 months below freezing
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Low-E units are warm on winter night. Clear glass is cool.
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Winter Sun: 8 hours of Daylight
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Summer Sun: 16 hours of Daylight
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High solar gain low-E is hot in sunlight
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Energy Terms
- U-Factor (heat loss)
- SHGC: Solar Heat Gain Coefficient
- VT: Visible Light Transmission
– Aesthetic (clarity, color) – Daylighting energy mostly in commercial
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Traditional Energy Solutions for Windows
- 1. Add layers to insulate glass
– Single, double, triple, etc.
- 2. Change frame material
– Metal, thermal break, wood/vinyl/fiberglass – Add warm-edge spacer
- 3. Add tinted or reflective glass
– Absorb sunlight with tinted glass – Reject with reflective glass
SLIDE 12
The Rule of Panes
Each layer of glass in a multi-pane unit adds approximately 1 “R” to the insulating value
(Inch-Pound R-Value)
Low-E coatings and gas fills displace layers
- f glass
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Lots of Panes
Single Pane ~ R1 Double Pane ~ R2 Triple Pane ~ R3 Quad Pane ~ R4 ……… “Octo-Pane” ~ R8
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“R2” Glass Window U ~ 0.50 (2.8)
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“R4” Glass Window U ~ 0.35 (2.0)
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Less “Pain” with Low-E
- Single Pane
~ R1
- Double Pane
~ R2
- Triple Pane
~ R3
- Quad Pane
~ R4
- 2 Pane + Low-E
~ R3
- 2P + Low-E + Argon
~ R4
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More Low-E and More Panes
- Single Pane
~ R1
- Double Pane
~ R2
- Triple Pane
~ R3
- Quad Pane
~ R4
- 2 Pane + Low-E
~ R3
- 2P+Low-E+Argon
~ R4
- Triple w/2 Low-E + Argon
~ R8
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Non-Metal Window U ~ 0.30 (1.7) 2 Pane + Warm Edge + Low-E + Argon
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Traditional Options for Solar Control Glass
Tinted
– Adds color to “body” of glass – Absorbs sunlight and re-radiates to exterior
Reflective
– Mirror appearance – Reflects sunlight out
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Clear Glass Window SHGC ~ 0.60
SLIDE 23
Window SHGC
SLIDE 24
The Solar Spectrum 45% 3% 52%
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2P Clear: Window SHGC ~ 0.6
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2P Tinted: Window SHGC 0.4 – 0.5
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A New Option for Solar Control Glass
Tinted
– Adds color to “body” of glass – Absorbs sunlight and re-radiates to exterior
Reflective
– Mirror appearance – Reflects sunlight out
Spectrally Selective Low-E
– Clear glass appearance with solar control – Reflects solar infrared (invisible to human eye)
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High Solar Gain Low-E: Window SHGC ~ 0.5
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Medium Solar Gain Low-E: Window SHGC ~ 0.3
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| Low-E | Clear Glass Med Solar | High Solar
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Low Solar Gain Low-E: Window SHGC ~ 0.2
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Dual Pane Insulating Glass
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High Solar Gain Low-E on Surface 3 = Hot in Sunlight!
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Triple Pane Insulating Glass
SLIDE 36
Triple Pane Coating Recommendations
- Avoid low-E on center pane (#3 or #4)
- Use high solar gain low-E on #5 for best
visible characteristics and lowered risk of thermal stress breakage
- Select High, Medium, or Low solar gain
low-E for #2 surface (orientation specific)
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