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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 = 25 W/m.K 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) T:24 (10 marks) d) Ts218) (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 T1 = 500 K, 11 = 30 mm, 12 = 90 mm, KA = 1.5 W/m.K, and ke = 0.25 W/m.K). T- h TS2 ko Steam TS2 TS1 B Figure 2: steam flowing in a pipe