A steam pipe 200-mm in diameter passes through a large basement room. The temperature of the pipe wall is 500°C, while that of the ambient air in the room is 20°C. Determine the heat transfer rate by convection and radiation per unit length of steam pipe if the emissivity of the pipe surface is 0.8 and the natural convection heat transfer coefficient has been determined to be 10 W/(m2 K).
GIVEN
FIND
- Heat transfer rate by convection and radiation per unit length of the steam pipe (q/L)
ASSUMPTIONS
- Steady state prevails
- The walls of the room are at the same temperature as the air in the room
- 
ASSUMPTIONS
- Steady state prevails
- The walls of the room are at the same temperature as the air in the room
- 
SKETCH
The net radiative heat transfer rate for a gray object in a blackbody enclosure is given
The convective heat transfer rate is given by
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