|
Visible Light Transmitted |
It is the ratio of
visible solar energy (380 - 750nm) that passes through the glazing system to
the total visible light falling on the system. |
|
Visible Light Reflectance |
It is the total
percentage of visible light to be reflected by a glazing system that can be
seen visually. |
|
Total Solar Energy
Transmitted |
It is the ratio of the
total solar energy passing through a glazing system to the amount of total
solar energy falling on that glazing system. |
|
Total Solar Energy
Reflected |
This is the ratio of
the amount of the total solar energy directly reflected by the glazing
system to the amount of total solar energy falling on that glazing system. |
|
Total Solar Energy Absorbed |
The ratio of the amount
of total solar energy directly absorbed by the glazing system to the amount
of total solar energy falling on that glazing system. |
|
Ultraviolet Light
Transmitted |
This is the ratio of
solar energy (wavelength of 300 - 380nm) that is transmitted by a glazing
system to the total solar Ultraviolet energy falling on the glazing system.
Note: UV energy is not visible to human eye and is mainly responsible
for the degradation and de-coloration of organic matter, upholsteries,
colors etc. |
|
Total Solar Energy |
A sum of energy
transmitted, reflected and absorbed by the glazing system is known as total
solar energy (100%). |
|
Total Energy Rejected |
It is the percentage of
incident solar energy rejected by a glazing system equal to the solar
reflectance + a part of solar absorption which is re-radiated outward. |
|
'U' Factor |
U Factor is a measure of
the rate of heat conductivity of a glazing system, and it is independent of
solar radiation. When multiplied by the difference between indoor and
outdoor temperature in Fahrenheit, it gives the amount of heat in
BTUs/hour/square foot of glazing. Note that the greater the
temperature difference, the greater the U Factor, so it is important to use
the U Factors closely representing your conditions. |
|
Shading Coefficient |
The Shading Coefficient
is the ratio of the solar heat gain through a given glazing system to that
of a standard plane glass (1/8 inch or 3mm thickness) under the same test
condition. Lower the Shading Coefficient number betters the sun
control capability. |
