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281WINDOWS

281-530-8100
12999 Murphy Rd. Suite D-1
Stafford, Texas 77477

Showroom Hours:
Monday-Friday
9:00am-5:00pm
Saturday
10:00am-2:00pm
Closed Sunday
After hours by appointment only

Energy Star


 
Summer
Time
U-Value
Summer
Time
R-Value
Shading
Coefficient
Solar
Heat Gain
Coefficient
Visible
Light
Transmission
Coolness
Index
Ultraviolet
Light
Transmission
Relative
Heata Gain
Btu/Hr/ft
Clear Single Pane
1.03
0.97
1.00
0.89
90%
0.90
71%
214
Clear IG
0.55
1.82
0.89
0.78
81%
0.91
58%
188
Gray IG
0.55
1.82
0.73
0.62
55%
0.75
39%
151
Bronze IG
0.55
1.82
0.74
0.63
62%
0.84
42%
155
Sunglass IG
0.55
1.82
0.72
0.63
76%
1.06
52%
152
Low E IG
0.44
2.27
0.85
0.72
75%
0.88
47%
176
Evergreen TM IG
0.57
1.75
0.59
0.51
69%
1.17
23%
176
EnviroShield IG
0.30
3.33
0.47
0.33
72%
1.53
16%
98
EvergreenTM is a registered trademark of Libbey-Owens-Ford, Toledo, OH
EnviroShield is a registered trademark of Enlight Industries L.L.C. - Houston, TX
Sources: American Flat Glass, Cardinal CG, Libbey-Owens-Ford. Data based on 3/4" IG, DSB (1/8") Glass, and 1/2" airspace
U-Value
The amount of heat transmitted by the window. The lower the number, the more efficient the window in reducing winter and summer heating/cooling costs.
R-Value
Designates a window's resistance to heat flow. The number is the inverse of the U-Value, the higher the number, the more efficient the window in reducing winter and summer heating/cooling costs.
Shading Coefficient
The ratio of solar heat gain through a glazing to the solar heat gain through a single lite of 1/8" glass. The smaller the number, the better the glazing is at preventing solar gain. The shading coefficient is specific to normal incidence angle and is being phased out in favor of solar heat gain coefficient. The lower the number, the more efficient the window is at reducing summer cooling costs.
Solar Heat Gain Coefficient
Is the fraction of incident solar radiation entering the home through the windows. The lower the number, the better the window is at preventing solar gain -- critical at reducing summer cooling costs.
Cooling Index
Is the Visible Light Transmittance divided by the Shading Coefficient. It relates to the ability of glass to let light in but keep solar heat out, which helps reduce energy costs for both air conditioning and lighting. The greater the number, the better.
Visible Light Transmission
In the visible spectrum, (380 to 720 nanometers), the percentage of light that is transmitted through the glazing relative to the C.I.E. ( International Commission on Illumination ) standard observer.
Ultraviolet Light Transmission
The amount of ultraviolet light allowed to penetrate the glazing.
Relative Heat Gain
The total amount of heat gain through a glazing system at NFRC/ASHRAE specified summer conditions, incorporating the U-Value and the Solar Heat Gain Coefficient. The conditions are 230 Btu/hr/ft2 , outdoor temperature of 89 degrees F, and 7.5 mph wind. Expressed in terms of Btu/hr/ft2.

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