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which metal for best reflectance of solar heat?

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Posted by phlegmatico on August 14, 2005, 7:53 am
Solar insolation has a spectrum of wavelengths.

And different metals have different reflectances at various

in an application requiring REFLECTANCE of solar insolation, which
metallization will reflect away, the most solar thermal gain? Gold,

I prefer to avoid silver because it requires heavy to remediate
tarnishing.... or is it so good that the maintenance effort is worth

How close does plain old aluminum foil come to the others?

I know that there is range of reflectance materials commercially sold;
they might eventually be chosen. In the mean time, I'm curious about
the above questions.

Posted by Full Name on August 14, 2005, 3:03 pm
On 14 Aug 2005 00:53:13 -0700, phlegmatico@yahoo.com wrote:

Posted by CWatters on August 14, 2005, 7:36 pm

or more ordinary materials (scroll down)

Posted by Uncle Al on August 14, 2005, 7:36 pm
 phlegmatico@yahoo.com wrote:

Depends on your wavelength window.  Pull a CRC Handbook and look it up
- "Optical Properties of Metals and Semiconductors"  Aluminum is tops
in the UV to visible, gold edges it out as you go deeper into the IR.

Uncle Al
 (Toxic URL! Unsafe for children and most mammals)

Posted by Autymn D. C. on August 15, 2005, 2:02 am
 You forget copper.

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