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A steel pipe, 5 m in length transmits superheated steam. Inner diameter of the pipe is 100 mm and the external diameter is 110mm. An insulation of thickness 30 mm is placed around the pipe. The steam inside the pipe is 500 °C and the external temperature is 20 °C. Find: a. Total thermal resistance (ER) The rate of heat transfer to the environment. b. h, for pipe interior = 60 W/m2K %3D h, for insulation exterior = 8 W/m?K %3D k = 60 W/m K for steel k= 0.030 W/m K for insulation 30 mm 110 mm 500 "C h-8 W/m K -100 mm h -60 W/m'K 20°C
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