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?
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
Also, if you have insulated glass, put the film on the exterior side. (OK to
put on interior if you have single glass).
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.
I have nothing better to do today, so I'll explain this..
All energy radiation is electromagnetic , which has a periodicity to
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 )
so the higher temperature means that the "frequency" of the UV
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..
Well, I'm in Tasmania which is nothing like the mainland of Australia. Its
colder but greener and wetter here. The countryside reminds me of
travelling through Britain when I was a kid. We had a VERY cold autumn but
the winter has been quite mild. This is supposed to be the last month of it
now and the month where, if it's going to snow, it will. Instead my orchids
(outside) are about to burst into flower and the fruit trees and wattles are
looking spectacular. An early spring!
I just met a couple of very nice fellows that were from Tasmania. They came
all the way to Northern Indiana to attend an Industrialized Housing seminar.
(Looooooog trip, grin.) When they talked about Tasmania, you could tell they
loved the place. Early spring after a cold winter, there's nothing like it.
Were heading into fall, one night this week got down to 40F (but we have a
ways to go yet.)
Cheers from Indiana
Yep, I have an idea of what Indiana can be like, I lived in Southern
Michigan from 65 to 72, in the outer suburbs of Detroit. Used to go from
110F in summer to -10F in winter. Talk about a land of extremes!
Spent all my teenage years there, so consequently have a love of soul,
motown, hard rock, funk, etc.
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