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Steam at an average temperature of ?∞= 400°C flows through a steel pipe. The inner and...

Steam at an average temperature of ?∞= 400°C flows through a steel pipe. The inner and outer radii of the pipe are r1 = 4 cm and r2 = 4.5 cm, respectively, and the outer surface of the pipe is insulated with a layer of 50 mm thick-calcium silicate of thermal conductivity of k = 0.5 W/m.K, and is maintained at 350 °C. If the convection heat transfer coefficient on the inner surface of the pipe is h = 65 W/m2 ·K, the thermal conductivity of the pipe is k = 50 W/m.K.

a) Draw the equivalent thermal circuit of the system and express all resistances.

b) Determine the heat loss per unit length of the pipe.

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