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Posted by Harbin on April 14, 2006, 4:08 am
 
Howdy Nick:
    Glass will trap infrared, so if you wanted to radiate heat into space, what
do you think would work best to isolate the panels from the ambient air, but
let the heat radiate through? Is there any type of glass that will let the
infrared
radiate into space, or would you have to use some kind of plastic?

--
SeeYaa:) Harbin Osteen KG6URO

This is YOUR future:
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Posted by Rod Speed on April 14, 2006, 5:00 am
 


You dont need to isolate them from the ambient
air if you want to get rid of heat at night.


By definition that isnt possible, its just the one source of infrared.


Best to have no glass at all.


Nope. Nothing is best.




Posted by clare at snyder.on.ca on April 14, 2006, 3:08 pm
 On Fri, 14 Apr 2006 15:00:36 +1000, "Rod Speed"


Check into "Low E" glass. It allows radiated energy through one way,
and blocks it the other. Definitely not 100 percent either direction,
but a significant improvement over straight glass. Can't remember
which side goes where, but if optimizing for AC in a warm climate, the
coating is on one surface, and if optimizing for heating in a cold
climate it goes on the other. Generally used on the inner surface of
one sheet of glass in a "sealed unit" of thermopane glass, and
GENERALLY argon filled.

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Posted by Solar Flare on April 14, 2006, 5:55 pm
 Low E is not made directional. It is made to block different
wavelengths of infrared more than others.

<clare at snyder.on.ca> wrote in message

ambient

infrared.

into space,

direction,

and y =


Posted by Loren Amelang on April 14, 2006, 7:18 pm
 On Fri, 14 Apr 2006 13:55:21 -0400, "Solar Flare"


My understanding is that "low emissivity" means just that - the
coating is not primarily a filter (though it does reduce transmission
of incoming radiant energy). The purpose of a low emissivity coating
is to reduce the heat re-radiated from the coated glass surface as a
result of the glass itself being hot.

In climates where you want to minimize summer cooling requirements,
you coat the second surface (counting from outside). The glass layer
that is touching the hot outdoor air then re-radiates less heat toward
the house. To minimize winter heat loss, you coat the third surface,
so the layer you've artificially heated doesn't radiate as much out
the window.

I've never seen an explanation of why you couldn't coat both
surfaces...  

But in the original case of maximizing heat loss, you'd want to coat
your radiator with a "high emissivity" coating, like black paint or
its higher-tech derivatives.

Loren

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