Determine the heat lost by radiation per metre length of a 75 mm oxidised steel pipe at 327°C if (a)

Determine the heat lost by radiation per metre
length of a 75 mm oxidised steel pipe at 327°C if (a) located in a large room
with red brick walls at a temperature of 27°C, (b) enclosed in a 150 mm  150 mm red brick
walls at a temperature of 27°C. Emissivities of oxidised steel and red brick
are 0.79 and 0.93 respectively.

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