Light Transmission
Light transmission inside de tube depends on specular reflectance of coating material covering the inside of the tube and on the incidence angle of solar radiation.
|
Material
|
Total reflectance
|
Specular reflectance
|
|
Anodised aluminium
|
88 %
|
60 - 80 %
|
|
Enhanced aluminium
|
95 %
|
80 - 90 %
|
 |
95 %
|
91 - 92,5 %
|
 |
99,6 %
|
99 %
|