1. A pipe is covered with three insulation layers where the corresponding thicknesses are 50 mm, 80mm and 100mm and the

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1 A Pipe Is Covered With Three Insulation Layers Where The Corresponding Thicknesses Are 50 Mm 80mm And 100mm And The 1 (32.42 KiB) Viewed 10 times

1. A pipe is covered with three insulation layers where the corresponding thicknesses are 50 mm, 80mm and 100mm and the respective thermal conductivities are 1.15 W/m-C, 1.45 W/m C and 2.8 W/m°C. The inner side of the pipe which has a diameter of 30 cm is exposed to a hot gas at 1200 "C with convection coefficient of 50 W/m and the temperature of the inner side of the pipe surface is 900 °C. The air outside the pipe is at 25°C with a convection coefficient of 20 W/ mc. a. Draw a schematic diagram which represents the heat transfer process [1 mark) b. Calculate the Heat transfer rate 13 mark] c. The overall heat transfer coefficient "U" of the system based on the inner pipe [3 mark] d. Temperature at each of the layers and at the outermost surface of the pipe. 13 mark)