The Concentric Blackbody Problem – Nick Stokes
Posted by Jeff Id on March 2, 2012
I have not had a chance to see Tallbloke’s guest post but Nick Stokes wrote a nice rebuttal to it. It discusses basic equations for a sphere in a sphere for blackbody calcs.
I’ve been arguing over at Tallbloke’s. It’s one of those posts where a sceptic does an elementary analysis and makes elementary errors which contradict “consensus” science. A new scientific discovery is announced. Being Galileos, they don’t have to check their work.
The sceptic here is Hans Jelbring. He looks at a simple problem, two concentric spheres without heat sources, and checks their radiation balance to find what the temperature difference should be. Consensus science says, of course, that there should be none, but he found one, and then spent time working out the resulting perpetual motion machine. I’m not sure what was the point of that, but Trenberth was mentioned.
I have sometimes done these analyses myself, being intrigued when what looks like a problem determined by geometry turns out to have a solution constrained by the Second Law of Thermodynamics (2LoT). Given the complexity, that can look like a miracle.