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Old 09-25-2012, 11:37 AM
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Blas Blas is offline
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Conductive Heat Transfer through Aluminum with thickness 2 mm and temperature difference 200 C (382 F)
q / A = 250 (W/mK) 200 (C) / 2 10-3 (m) = 25000 (kW/m2)

Conductive Heat Transfer through Stainless Steel with thickness 2 mm and temperature difference 200 C (382 F)
q / A = 16 (W/mK) 200 (C) / 2 10-3 (m) = 1600 (kW/m2)

The emissivity coefficient - ε - indicates the radiation of heat from a 'grey body' according the Stefan-Boltzmann Law,
compared with the radiation of heat from a ideal 'black body' with the emissivity coefficient ε = 1.

Stainless Steel, weathered emissivity coefficient = 0.85
Stainless Steel, polished emissivity coefficient = 0.075

Way to technical for me, and while I have not personally confirmed the above technical information , I did stay at a Holiday Inn last night........
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