Reflectivity of ALuminium Foils

[RKD89]

Can Anyone tell me the exact THERMAL reflectivity if aluminium foils used at home?

 

[Drakkith]

Have you tried a google search?

 

[A_Paradox]

Why do you want to know?

 

[RKD89]

i am thinking abt using them for a solar reflector ( parabolic dish)
n I Tried googling....wiki says it's abt 80-88%

 

[Dr Lots-o'watts]

i am thinking abt using them for a solar reflector ( parabolic dish)
n I Tried googling....wiki says it's abt 80-88%

That sounds about right. I doubt you can do better better for the cost. What you seem to be looking for is the "reflection spectrum" of aluminium, because the value depends on wavelength. By "thermal", you are practically referring to wavelengths that are greater than 800 nm (near to mid infrared).

The slighest crumble in the foil however will reduce the specular reflection. So if you want to direct the reflected light, you want to reduce crumbling to a minimum. Crumbling of foil turns it from a specular (mirror) reflecting surface to a diffuse (white) reflecting surface.

 

[RKD89]

That sounds about right. I doubt you can do better better for the cost. What you seem to be looking for is the "reflection spectrum" of aluminium, because the value depends on wavelength. By "thermal", you are practically referring to wavelengths that are greater than 800 nm (near to mid infrared).

The slighest crumble in the foil however will reduce the specular reflection. So if you want to direct the reflected light, you want to reduce crumbling to a minimum. Crumbling of foil turns it from a specular (mirror) reflecting surface to a diffuse (white) reflecting surface.

I have already tried d foil...works quite decent...
Of course the crumbling does result in some scattering...but in all it serves my applicaition
Thanx anyways