1. A pipe is covered with three insulation layers where the corresponding thicknesses are 150 mm,250mm and 300mm and the respective thermal conductivities are 3.2 W/m°C, 2.1 W/m°C and 1.5W/m C. The length of the pipe is 3m. The inner side of the pipe which has a diameter of 300 mmis exposed to a hot gas at 1000 °C with convection coefficient of 50 W/m2°C and the temperatureof the inner side of the pipe surface is 800 °C. The air outside the pipe is at 25°C with a convectioncoefficient of 35 W/m2°C.a. Draw a schematic diagram which shows the heat transfer processb. Calculate the Heat transfer ratec. The overall heat transfer coefficient "U" of the system based on the inner piped. Temperature at each of the layers and at the outermost surface of the pipe.

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1. A pipe is covered with three insulation layers 250mm and 300mm and the respective thermal conductivities are 3.2 W/m-C, 2.1 W/m W/m C. The length of the pipe is 3m. The inner side of the pipe which has a diameter of is exposed to a hot gas at 1000 °C with convection coefficient of 50 W/m²°C and the tem of the inner side of the pipe surface is 800 °C. The air outside the pipe is at 25°C with a co coefficient of 35 W/m2°C. a. Draw a schematic diagram which shows the heat transfer process b. Calculate the Heat transfer rate . The overall heat transfer coefficient "U" of the system based on the inner pipe Temperature at each of the layers and at the outermost surface of the nine

1. A pipe is covered with three insulation layers 250mm and 300mm and the respective thermal conductivities are 3.2 W/m-C, 2.1 W/m W/m C. The length of the pipe is 3m. The inner side of the pipe which has a diameter of is exposed to a hot gas at 1000 °C with convection coefficient of 50 W/m²°C and the tem of the inner side of the pipe surface is 800 °C. The air outside the pipe is at 25°C with a co coefficient of 35 W/m2°C. a. Draw a schematic diagram which shows the heat transfer process b. Calculate the Heat transfer rate . The overall heat transfer coefficient "U" of the system based on the inner pipe Temperature at each of the layers and at the outermost surface of the nine

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

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1. A pipe is covered with three insulation layers where the corresponding thicknesses are 150 mm,
250mm and 300mm and the respective thermal conductivities are 3.2 W/m°C, 2.1 W/m°C and 1.5
W/m C. The length of the pipe is 3m. The inner side of the pipe which has a diameter of 300 mm
is exposed to a hot gas at 1000 °C with convection coefficient of 50 W/m2°C and the temperature
of the inner side of the pipe surface is 800 °C. The air outside the pipe is at 25°C with a convection
coefficient of 35 W/m2°C.
a. Draw a schematic diagram which shows the heat transfer process
b. Calculate the Heat transfer rate
c. The overall heat transfer coefficient "U" of the system based on the inner pipe
d. Temperature at each of the layers and at the outermost surface of the pipe.

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