|
Method of Heat (Energy) Transfer
There are three main mode of heat transfer,
namely
Radiation, Conduction
and
Convection.
(See Diagram below)
Radiation:
Heat transfer through space
Conduction:
Heat transfer through glass
Convection:
Heat transfer by winds
How Film Works by Reducing Heat Gain
Total Solar Energy is either Reflected,
Absorbed or Transmitted
All of which equal 100%. The diagram
below illustrate how high tech film can
reject heat.
Medium Density Film Parameter
|
Solar Transmittance |
22% |
|
Solar Reflectance |
43% |
|
Solar Absorptance |
35% |
|
Visible Light Transmission |
28% |
|
Visible Light Reflectance |
44% |
|
U-Factor |
1.05 |
|
Ultralviolet Transmittance (Less
Than) |
1% |
|
Shading Coefficient |
0.36 |
|
Total Solar Energy Rejected |
68% |
Calculating Solar Energy Reductions
Solar Heat Rejection
(SC*1 of Glass) - (SC#1 of Glass with Film)
= 0.94 - 0.36
= 62%
SC*1 of Glass
0.94
Heat Loss Reduction
(U-Value of Glass) - (U-Value of Glass
with Film) =
1.11 - 1.05 =
5%
U-Value of Glass
1.11
Glare Reduction
(VL Trans.*2 of Glass) - (VL Trans. *2 of
Glass with Film) =
88% - 28% =
68%
VL Trans. *2 of Glass
88%
UV Reduction
(UV Trans. *3 of Glass) - (UV Trans. *3
of Glass with Film) =
68% - 1% =
99%
UV of Glass
68%
|
Legend |
|
|
SC*1 |
Shading Coefficient |
|
VL Trans.*2 |
Visible Light Transmission |
|
UV Trans. *3 |
Ultraviolet Light Transmission |
|
