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Que.  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 per m² based on inside area 
a.  – 63.79 W/m² 
b.  – 73.79 W/m² 
c.  – 83.79 W/m² 
d.  – 93.79 W/m² 
Correct Answer:– 73.79 W/m²

Apr :(February 26, 2020)
Pls explain

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