Glass Performance
|
Code |
Description |
U-Value |
R-Value |
Solar Heat Gain |
Ultraviolet Blockage |
Visible Light Transmittance |
Clear |
Dual |
Dual panes of clear glass, no coatings and no Argon |
0.5 |
2.02 |
0.76 |
42% |
81% |
Tri |
Triple panes of clear glass, no coatings and no Argon |
0.32 |
3.15 |
0.68 |
42% |
74% |
Low E |
HS1 |
Dual panes of glass, one pane with Low E coating |
0.35 |
2.88 |
0.72 |
56% |
76% |
HS1A |
Dual panes of glass, one pane with Low E coating and Argon |
0.3 |
3.33 |
0.73 |
56% |
76% |
HS2 |
Tripane glass, one pane with Low E coating |
0.24 |
4.17 |
0.66 |
63% |
69% |
HS2A |
Tripane glass, one pane with Low E coating and Argon |
0.22 |
4.58 |
0.66 |
63% |
69% |
HS3 |
Tripane glass, two panes with Low E coating |
0.2 |
5 |
0.56 |
72% |
64% |
HS3A |
Tripane glass, two panes with Low E coating and Argon |
0.17 |
5.97 |
0.56 |
72% |
64% |
SunStop |
HS4 |
Dual panes of glass, one pane with SunStop coating |
0.29 |
3.44 |
0.39 |
70% |
62% |
HS4A |
Dual panes of glass, one pane with SunStop coating and Argon |
0.24 |
4.17 |
0.39 |
70% |
62% |
HS5 |
Tripane glass, one pane with SunStop coating |
0.22 |
4.57 |
0.37 |
75% |
57% |
HS5A |
Tripane glass, one pane with SunStop coating and Argon |
0.19 |
5.31 |
0.37 |
75% |
57% |
HS6 |
Tripane glass, two panes with SunStop coating |
0.16 |
6.31 |
0.3 |
86% |
43% |
HS6A |
Tripane glass, two panes with SunStop coating and Argon |
0.12 |
8.2 |
0.29 |
86% |
43% |
All performance is C.O.G. (centre of glass) ratings based on Vision v4.0 simulations. All C.O.G U- and R-values are based on ASHREA Winter Conditions. K-Values shown are based on approximate conversion from imperial R-Values [K=1(r/4.88].
U Value: is the total heat transfer out of a window (Btu/hr-sq ft-F or W/sq m- C) the lower the number the better the glass. U value is the inverse of R value. R= 1/u
R-Value: is the amount of heat retained by the window. The higher the number the better the glass.
Solar Heat Gain Coefficient: is the amount of solar radiation which enters the house through radiation. This is expressed as a dimensionless number between 0 and 1. It represents the heat gain through 3mm clear glass.
Visible Light Transmittance: measures how much of the visible light is entering the building through the glass. 1.0 would mean all of the light was getting through and 0 would mean none of it was getting in. Our atmosphere naturally filters out 5% of the visible light. Clear glass with no coatings lets in approx. 90% of visible light.
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