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Should radiation be included in our Heat sink calculations?

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Old   May 11, 2010, 08:09
Question Should radiation be included in our Heat sink calculations?
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We have an outdoor enclosure with an external finned heat that uses a sun shade and natural convention. Should we use the "include radiation" option that is avalible on most heat sink performance calculators?
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Old   May 11, 2010, 14:24
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Estimate the radiative heat transfer using differences between the quantities epsilon*sigma*temperature^4 where epsilon is the emissivity and sigma is the Stefan-Boltzman constant. Compare this result with the characteristic heat transfer due to natural convection. Decide whether ths contribution from radiation is small enough to neglect.
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