[Stoves] Black radiating surfaces

[Richard Stanley]

ref radient heat emissivity and reflectance,  I was wondering what  
the radient heat reflectance is within a cylinder such as that of the  
hollow core briquette. We just completed two short trainings here and  
I am again reminded of the tremendous effect of that glowing white to  
red core (1.25" dia x 3" height) inside what is otherwise leaves,  
grass and junk mail here..No where near as much glow with shorter  
heights of say 1 - 1.5 inches--or for that matter. It also remains  
true that with all its power the slightest --whispy covering of ash  
on the red surface nearly obliterates that effect.
Externally, that is, IR reflectance off stove walls of different  
colors  is well corroborated with what you are saying. Same  
briquettes in a copper colored stove walls reflect far less than same  
bqs in a black enameled (weber) stove wall.

Richard Stanley
State of Jefferson