Window Shade Specifications

These are the Window Shade Specifications for our Solar Trends SunShades:

Total Solar Energy Visible Light Glare Rejection Total Solar Energy Rejected UV light Rejected
Transmitted Reflected Absorbed Transmitted “U” Factor Shading Coefficient
Bronze Silver Em 10% 67% 24% 8% 1.00 0.20 97% 92% 99.8%
Grey Silver EM 10% 61% 33% 8% 1.05 0.21 91% 82% 99%
Reflective Bronze 17% 33% 50% 10% 0.83 0.57 82% 73% 96%
Reflective Silver 7% 57% 36% 8% 1.00 0.23 90% 86% 86%
Reflective Smoke 17% 33% 50% 11% 0.83 0.57 78% 73% 96%
Medium Smoke 39% 9% 52% 37% 0.83 0.60 57% 51% 96%

Definitions:

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.