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Window Shade Specifications
| Total Solar Energy | Visible Light | Total Solar Energy Rejected | Ultraviolet Light Rejected | |||||
| Transmitted | Reflected | Absorbed | Transmitted | "U" Factor | Shading Coefficient | |||
| Bronze-Silver Embossed | 10% | 67% | 24% | 8% | 1.00 | 0.20 | 85% | 99.4% |
| Grey-Silver
Embossed |
10% | 61% | 33% | 8% | 1.05 | 0.21 | 82% | 99% |
| Reflective Bronze | 17% | 33% | 50% | 10% | 0.83 | 0.57 | 73% | 96% |
| Reflective Silver | 7% | 57% | 36% | 8% | 1.00 | 0.23 | 86% | 86% |
| Reflective Smoke |
17% | 33% | 50% | 11% | 0.83 | 0.57 | 73% | 96% |
| Medium Smoke |
39% | 9% | 52% | 37% | 0.83 | 0.60 | 51% | 96% |
Total Solar Transmittance
The ratio of the amount of total solar energy in the full solar
wavelength range (300-2,100 nanometers) that is allowed to pass
through a glazing system to the amount of total solar energy falling
on that glazing system. Value is usually expressed as a percent.
Total Solar Reflectance
The ratio of total solar energy which is reflected outward by the
glazing system to the amount of total solar energy falling on the
glazing system. On filmed windows this reflectance is a function of
the side of the film facing the window surface. Value is usually
expressed as a percent.
Total Solar Absorption
The ratio of the amount of total solar energy absorbed by a glazing
system to the amount of total solar energy falling on the glazing
system. Solar absorption is that portion of total solar energy
neither transmitted nor reflected. Since solar transmittance and
solar reflectance are measured directly, the following equation
should be used in calculating solar absorption. Solar absorption
=1.00 - (solar transmittance) - (solar reflectance)
Visible Light Transmittance
The ratio of the amount of total visible solar energy (380-780
nanometers) that is allowed to pass through a glazing system to the
amount of total visible solar energy falling on the glazing system.
Value is usually expressed as a percent. Glare is influenced by
visible light transmittance through a glazing system.
U-Factor
The overall heat transfer coefficient of the glazing system, U -Factor is
a measure of the heat transfer that occurs through the glazing
system, and its outer and inner surfaces. This value is a function
of temperature, and is expressed in BTU per square foot per hour per
degree Fahrenheit (BTU/ sq. ft./hr. degrees F). The lower the U-
Factor, the better the insulation qualities of the glazing system.
Shading Coefficient (SC)
The ratio of the solar heat gain through a given glazing system to
the solar heat gain under the same conditions for clear, un-shaded
double strength window glass (DSA). Shading coefficient defines the
sun control capability or efficiency of the glazing system.
Total Solar Energy Rejected
The percent of incident solar energy rejected by a glazing system
equals solar reflectance plus the part of solar absorption which is
reradiated outward.
Shade Cassette
Shade Cassette: Usually made of aluminum.
The shade is installed within the cassette unit protecting it on
three sides (top, front and back). The shade and cassette are
installed as one unit.
Shade cassettes are available at addition cost.
Shade cassettes are available at addition cost.