> From: mix...@bigpond.com > Sent: Thursday, June 6, 2013 2:20:29 PM > You left out a possibility:- The gas.
I suspect it's pretty thin, relatively speaking , both as a target for futon absorption (a technical term, laymen don't have to use it [note 1]) and heat capacity (specific heat * mass). I think it's NAE-to-steel by futon, and then steel-to-nickel by radiation. I'm not sure that NAE-to-H by futon, and H-to-Ni by conduction would be much different. It's a constant-temperature thermal bath either way. A peek into the tube of the Penon version is equivalent to looking into the central cavity, which is in thermal equilibrium. I think that NAE-futon-Ni will make the Ni to hot. It may happen accidentally (OCCASIONAL craters seen on SEM's) but it's not the norm. ps I misread my own plot -- a 500C output has a 510C center --- except that I think that my thermal resistivity for ceramic is WAY too low -- The Penon picture shows the center red hot and the outside black. (Could be an emissivity difference too). [note 1] : From an ABC weatherperson. It's my current favorite phrase.
