Engineering :: Heat Transfer

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A sphere of radius 40 cm is lagged to a radius of 50 cm. The temperatures of outer and inner surfaces are 66?C and 235?C respectively. Thermal conductivity of logging per cm thickness is 0.7 kcal/m-hr?C. The rate of heat leakage will be

[A].	1.49 kcal/hr	[B].	298 kcal/hr
[C].	398 kcal/hr	[D].	500 kcal/hr
[E].	666 kcal/hr

Answer: Option B

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