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-   -   Should radiation be included in our Heat sink calculations? (http://www.cfd-online.com/Forums/main/75991-should-radiation-included-our-heat-sink-calculations.html)

MWz May 11, 2010 08:09

Should radiation be included in our Heat sink calculations?
 
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?

Jade M May 11, 2010 14:24

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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