Wednesday, April 11, 2007
HW #4, P5 - Minimum Insulation Thickness for a Hot Surface - 5 pts
A flat surface is covered with insulation with a thermal conductivity of 0.08 W/m-K. The temperature at the interface between the surface and the insulation is 300oC. The outside of the insulation is exposed to air at 30oC and the convection heat transfer coefficient between the insulation and the air is 10 W/m2-K. Ignoring radiation heat transfer, determine the minimum thickness of the insulation, in m, such that the outside surface of the insulation is not hotter than 60oC at steady-state.
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2 comments:
i have no idea when i should use the 60 degree and when i should use the 30degree.
chem:
Draw a picture. The air is at 30C and the outer surface of the insulation is at 60C. The inner surface of the insulation is at 300C. Life is a story problem and drawing a picture almost always helps.
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