Steam at 300 °C travels through a pipe covered with two layers of insulation. The first layer of insulation is 3 cm thick and the second layer is 5 cm thick. The pipe is made of steel (k = 58 W/m-K) and has an IDof 160 mm and an OD of 170 mm. Air at 50 °C flows over the pipe. The convection coefficients of the inside and outside flows are 30 and 5.8 W/m2 -K, respectively.
a. Draw an electrical schematic that is equivalent to the thermal network.
b. Identify assumptions applicable to this problem.
c. What is the equivalent or total thermal resistance?
d. Calculate the heat transfer