Engineering, 20.02.2020 22:52 dondre54

Steam flowing through a long, thin-walled pipe maintains the pipe wall at uniform temperature of 500K. The pipe is covered with an insulated blanket (orange area in the schematic below). The outer surface of the blanket is exposed to air at 300K. The heat transfer coefficient of the air is assumed to be at 25W/m²/K. r = 50 mm -r2 = 100 mm -k = 0.25 W/m•K 1 Toh T3,1 = 500 K (a) Sketch the thermal circuit of the system. Label all pertinent nodes (using the preceding symbols) and the resistances. (10 pts) (b) What is the heat loss rate per unit length from the pipe? (10 pts) (c) What is the temperature of the outer surface of the blanket (Ts, 2)?

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