A horizontal steel pipe of 50-mm diameter is maintained at 60°C in a large room where the air and wall temperature is at 25°C. The surface emissivity of steel is 0.8. If h c = 6.5 W/m 2 K, calculate...

A horizontal steel pipe of 50-mm diameter is maintained at 60°C in a large room where the air and wall temperature is at 25°C. The surface emissivity of steel is 0.8. If h_c
= 6.5 W/m²K, calculate the total heat lost by the pipe per unit length.