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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
Posted: Sat May 21, 2022 5:07 pm
by answerhappygod
- 1 A Pipe Is Covered With Three Insulation Layers Where The Corresponding Thicknesses Are 50 Mm 80mm And 100mm And The 1 (38.85 KiB) Viewed 15 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/m²°C 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/m²°C. 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 13 mark] [3 mark) d. Temperature at each of the layers and at the outermost surface of the pipe.