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Posted by Judanne on August 15, 2006, 7:29 pm
Hi all,
I've put some U.V. film on my southern (shaded) side of the house because of
glare from a metal colourbond fence some metres from the window. I was
wondering, if I put it on the northern windows (which I rely on for
supplementary heating during winter) will it also block the Infrared rays
that heat the slab?
Judanne
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Posted by PPS on August 16, 2006, 6:24 pm
It will block the most of the UV rays (that convert to IR after they pass
through the window). Personally I would not put the film on the north
windows.
Also, if you have insulated glass, put the film on the exterior side. (OK to
put on interior if you have single glass).
show/hide quoted text
> Hi all,
> I've put some U.V. film on my southern (shaded) side of the house because
> of glare from a metal colourbond fence some metres from the window. I was
> wondering, if I put it on the northern windows (which I rely on for
> supplementary heating during winter) will it also block the Infrared rays
> that heat the slab?
> Judanne
>
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Posted by Judanne on August 16, 2006, 10:46 pm
Thanks for that, it was something I had often wondered about. I didn't know
that UV converted to IR after passing through glass. Guess I'll just have
to build a solar pergola after all!
Solar pergola = pergola with many fixed louvres angled so that all the
winter sun comes through but the hottest sun is excluded in mid summer.
Allows rain and breezes to flow through, too.
Judanne
show/hide quoted text
> It will block the most of the UV rays (that convert to IR after they pass
> through the window). Personally I would not put the film on the north
> windows.
> Also, if you have insulated glass, put the film on the exterior side. (OK
> to put on interior if you have single glass).
>> Hi all,
>> I've put some U.V. film on my southern (shaded) side of the house because
>> of glare from a metal colourbond fence some metres from the window. I
>> was wondering, if I put it on the northern windows (which I rely on for
>> supplementary heating during winter) will it also block the Infrared rays
>> that heat the slab?
>> Judanne
>
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Posted by AndyS on August 17, 2006, 12:12 pm
Judanne wrote:
show/hide quoted text
> Thanks for that, it was something I had often wondered about. I didn't know
> that UV converted to IR after passing through glass. Guess I'll just have
> to build a solar pergola after all!
Andy comments:
I have nothing better to do today, so I'll explain this..
All energy radiation is electromagnetic , which has a periodicity to
the
electromagnetism called "frequency". Radio waves, radar, light
waves, infrared rays, UV rays are just electromagnetic radiation
at different frequencies.....
Any material, when intercepting rays of any frequency, can do
three things: 1 Reflect it away 2 Pass it thru 3 Absorb it
Usually it is a combination of all three.... UV film is mainly
#3 , absorption...
Anything absorbed, raises the temperature of the material.
As temperature increases, black body radiation ( aka infrared )
increases,
so the higher temperature means that the "frequency" of the UV
radiation
is retransmitted at infrared, which is a lower "frequency".
Ok, that's it on a 9th grade physics level.
I expect that nit-pickers, who didn't bother to post in the
first place, will attempt to find flaws in this explanation....
Good luck to them.... The explanation is accurate..
Andy
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Posted by Judanne on August 18, 2006, 7:33 am
Thank you very much. Never did 9th grade physics, so it is much
appreciated.
Judanne
show/hide quoted text
> Judanne wrote:
>> Thanks for that, it was something I had often wondered about. I didn't
>> know
>> that UV converted to IR after passing through glass. Guess I'll just
>> have
>> to build a solar pergola after all!
> Andy comments:
> I have nothing better to do today, so I'll explain this..
> All energy radiation is electromagnetic , which has a periodicity to
> the
> electromagnetism called "frequency". Radio waves, radar, light
> waves, infrared rays, UV rays are just electromagnetic radiation
> at different frequencies.....
> Any material, when intercepting rays of any frequency, can do
> three things: 1 Reflect it away 2 Pass it thru 3 Absorb it
> Usually it is a combination of all three.... UV film is mainly
> #3 , absorption...
> Anything absorbed, raises the temperature of the material.
> As temperature increases, black body radiation ( aka infrared )
> increases,
> so the higher temperature means that the "frequency" of the UV
> radiation
> is retransmitted at infrared, which is a lower "frequency".
> Ok, that's it on a 9th grade physics level.
> I expect that nit-pickers, who didn't bother to post in the
> first place, will attempt to find flaws in this explanation....
> Good luck to them.... The explanation is accurate..
> Andy
>
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> I've put some U.V. film on my southern (shaded) side of the house because
> of glare from a metal colourbond fence some metres from the window. I was
> wondering, if I put it on the northern windows (which I rely on for
> supplementary heating during winter) will it also block the Infrared rays
> that heat the slab?
> Judanne
>