Environmental IR Radiation Entering Ground Equipment 1

[Tunalover]

Guys:
For the IR heat absorbed from a terrestrial environment (but NOT including sunlight), how can I prove/show that the emittance and absorptance of a particular painted or unpainted metal surface are equal for that IR spectrum? I know it involves Kirchoff's Law but Kirchoff's Law is much more than just α=ε (true only for gray bodies).

ElectroMechanical Product Development
(Electronics Packaging)
UMD 1984
UCF 1993

 

[IRstuff]

Seriously? I thought it was so obvious, but apparently not:

https://www.photonics.com/EDU/emissivity/d3826

https://www.photonics.com/EDU/radiant_emittance/d6531

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

http://www.eng-tips.com/forumlist.cfm

 

[Tunalover]

IRStuff I thought you were going to provide a source for your definition of "emittance". "Radiant emittance" is not "emittance".

ElectroMechanical Product Development
(Electronics Packaging)
UMD 1984
UCF 1993