Question 4. [40 marks] Steam flowing through a pipe that is covered with an insulating material that comprise of two different materials (A and B) as shown in Figure 2. If entire outer surface area is exposed to air for which h = 15 W/m2K and T. = 300 K, Determine: a) Sketch the thermal circuit of the system. (10 marks) b) Total heat loss from the pipe. (10 marks) c) Ts2/A. (10 marks) d) Ts 2B). (10 marks) 2 (Assume an infinite contact resistance in the interface between A and B, and the pipe wall temperature was uniform and maintained at Ts1 = 500 K 11 = 50 mm, 12 = 100 mm, ka = 4 W/m.K, and ke = 0.5 W/m.K). T- h TS2 KB Steam TS2) *TS1 B Figure 2: steam flowing in a pipe