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Electric current flows through a 10 mm diameter conducting rod, 1 m long. A rod with a surface temperature of 222 ° C is placed in an environment with a temperature of 25 ° C and is required to be covered with an insulation material with a heat conductivity coefficient of 1.4 W / mK. Since the heat transfer coefficient between the surface and the environment is 122 W / m2K; a) When coated with the said insulation material in 6 mm thickness, will the heat loss from the bar to the environment decrease compared to the uninsulated situation? Explain why it decreases or not. b) If the rod is covered with this insulation material in 55 mm thickness, how much does the heat loss decrease in%?

Electric current flows through a 10 mm diameter conducting rod, 1 m long. A rod with a surface temperature of 222 ° C is placed in an environment with a temperature of 25 ° C and is required to be covered with an insulation material with a heat conductivity coefficient of 1.4 W / mK. Since the heat transfer coefficient between the surface and the environment is 122 W / m2K; a) When coated with the said insulation material in 6 mm thickness, will the heat loss from the bar to the environment decrease compared to the uninsulated situation? Explain why it decreases or not. b) If the rod is covered with this insulation material in 55 mm thickness, how much does the heat loss decrease in%?

Elements Of Electromagnetics
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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Electric current flows through a 10 mm diameter conducting rod, 1 m long. A rod with a surface temperature of 222 ° C is placed in an environment with a temperature of 25 ° C and is required to be covered with an insulation material with a heat conductivity coefficient of 1.4 W / mK. Since the heat transfer coefficient between the surface and the environment is 122 W / m2K;
a) When coated with the said insulation material in 6 mm thickness, will the heat loss from the bar to the environment decrease compared to the uninsulated situation? Explain why it decreases or not.
b) If the rod is covered with this insulation material in 55 mm thickness, how much does the heat loss decrease in%?

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