[time-nuts] Double ovened 10811-60158 on ebay
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Sat Jul 12 17:43:11 EDT 2008
Mark Sims wrote:
> Remember that heat flow is proportional to the FOURTH power of the temperature difference. Insulation is generally a linear function. The combination makes thermal stabilization over even small ambient temperature ranges rather problematic.
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Nonsense.
The radiative transfer between 2 bodies at different temperatures is
proportional to the difference between the 4th powers of their absolute
temperatures.
However this requires a medium between the 2 bodies that is transparent
to the wavelenghts of interest and emissivity that is constant with
wavelength.
In a practical situation convection and conduction are also significant.
Conductive heat flow is proportional to the temperature difference
between the 2 bodies.
Bruce
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