A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation

A polished metal pipe 5 cm outside diameter and 370 K temperature at

1.	A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation
A.	11.04 W/m2 degree
B.	12.04 W/m2 degree
C.	13.04 W/m2 degree
D.	14.04 W/m2 degree
Answer» D. 14.04 W/m2 degree

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A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m<sup>2</sup> degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation
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