An 0.2 m OD oxidized steel pipe at a surface temperature of 756 K passes through a large room in which the air and the walls are at 38°C. If the heat transfer coefficient by convection from the surface of the pipe to the air in the room is 28 W/(m² K), estimate the total heat loss per meter length of pipe.

GIVEN

• An Oxidized steel pipe passes through a large room
• Pipe outside diameter (D) = 0.2 m
• Pipe surface temperature (T_s) = 756 K
• Air and wall temperature (T_∞) = 38°C = 311 K
• Convective heat transfer coefficient (h_c) = 28 W/(m² K)

ASSUMPTIONS

• Steady state
• The walls of the room are black (????w = 1.0)
• The H₂O and CO₂ in the room air are negligible

Transcribed Image Text:

Room T= 311 K | D= 0.2 Plpe m T; = 765 K