J
john jardine
Guest
"Gene" <genes@wildblue.net> wrote in message
news:J400j.11$dG4.116851@news.sisna.com...
temperature. This is about 2kW electrical heat input for an hour. Springs to
mind therefore that an arc welding transformer would be ideal.
But ... from theory into the real world and you move into the tricky
subject of thermodynamics, which needs account taking of many other
environmental and material radiative/diffusion characteristics.
A finite element, 3D heat flow solver program, seems the only way to point
to some kind of real answer.
Or maybe if it's a class project, program something based on Fouriers law of
heat conduction but make a lot of simplifying assumptions.
news:J400j.11$dG4.116851@news.sisna.com...
You've about 250lbs of steel there, so in theory 6.8MJ will get it up toGood day, all.
Problem: Cause a sphere that is 6 feet in diameter and made of
0.05 inch thick plate steel (or other metal?) to reach a uniform skin
temperature
of 300F degrees by using 220 or 440VAC as a source?
First, is it possible?
(I'm sure there are better ways of doing this than making the entire
sphere a shorted heating element - but this question relates only to
whether
it's POSSIBLE, not practical.)
"IF" it's possible, what type of transformer would you use?
That is, what would the OUTPUT in volts, amps, watts, etc be -
assuming that you wanted the sphere to reach a uniform skin
temperature of 300F? Basically, we just want to "short-out" the
sphere & cause it to heat to 300F with AC or DC current - so
what's the transformer design
THANKS,
Gene
temperature. This is about 2kW electrical heat input for an hour. Springs to
mind therefore that an arc welding transformer would be ideal.
But ... from theory into the real world and you move into the tricky
subject of thermodynamics, which needs account taking of many other
environmental and material radiative/diffusion characteristics.
A finite element, 3D heat flow solver program, seems the only way to point
to some kind of real answer.
Or maybe if it's a class project, program something based on Fouriers law of
heat conduction but make a lot of simplifying assumptions.