The gas at an average temperature of 160 oC is carried through a steel (steel=46 W/m2.K) pipe with an inner diameter of 9.2 cm and an outer diameter of 11.0 cm. The pipe is first covered externally with insulation material with a thermal conductivity coefficient of k=0.0623 W/m.K in 4 cm thickness and then with another material with a thermal conductivity coefficient of k=0.047 W/m.K in 3 cm thickness. The individual convective heat transfer coefficient on the gas side inside the pipe is 63 W/m2.K, and the individual convective heat

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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The gas at an average temperature of 160 oC is carried through a steel (steel=46 W/m2.K) pipe with an inner diameter of 9.2 cm and an outer diameter of 11.0 cm. The pipe is first covered externally with insulation material with a thermal conductivity coefficient of k=0.0623 W/m.K in 4 cm thickness and then with another material with a thermal conductivity coefficient of k=0.047 W/m.K in 3 cm thickness. The individual convective heat transfer coefficient on the gas side inside the pipe is 63 W/m2.K, and the individual convective heat transfer coefficient on the atmospheric air side outside the pipe covered with insulation material is 37 W/m2.K. Since the temperature of the atmospheric air where the pipe is located is 23 oC; a) Calculate the heat transferred per unit pipe length, b) the interface temperatures between the layers.
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