Question 3: (11 Marks) Steam at T1=320C flows in a cast iron pipe (k0=80W/mC) whose inner and outer diameters are D1=5cm and D2=5.5cm, respectively. The pipe is covered with Y3-cm-thick glass wool insulation with kw=0.05W/mC. Heat is lost to the surroundings at T2=5C by natural convection, with a combined heat transfer coefficient of h2=18W/m2C. Taking the heat transfer coefficient inside the pipe to be h1=60W/m2C. (a) Calculate the rate of heat loss from the steam per meter length of the pipe. (5 Marks) (b) Determine the temperatures T1,T2 and T3 of the inner, outer surfaces of the pipe wall and the outer surface of insulation. (6 Marks)