wrote:

... if the metal is a good conductor, eg steel with 50 Btu/h-ft-F, with
poor airfilm conductances on both sides, eg 5 Btu/h-F-ft^2, thinner steel
won't help much. How much, in this case, starting with 0.050" steel?

Heh, don't try to obfuscate the facts by spewing a bunch of calcs as
usual, trying to cover up...

It's 300-year-old physics :-) What's the answer to this simple problem?

Still no clue? Rewrite the steel conductivity as 50 Btu-ft/h-ft^2-F...

Still stuck? Try 600 Btu-inch/h-ft^2-F.

This is an extremely simple heatflow problem :-)

Nick