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Question
A spherical vessel of 0.5 m outside diameter is insulated with 0.2 m thickness of insulation of thermal conductivity 0.04 W/m degree. The surface temperature of the vessel is – 195 degree Celsius and outside air is at 10 degree Celsius. Determine heat flow
Options:
A .  – 47.93 W
B .  – 57.93 W
C .  – 67.93 W
D .  – 77.93 W
Answer: Option B
Answer: (b).– 57.93 W

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