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An electric cable of 20 mm diameter is insulated with rubber, which is exposed to the atmosphere at 300 C. Calculate the most economical thickness of rubber insulation (k = 0.175 W/m.K). When cable surface temperature with and without insulation is at 700 C. Also calculate the percentage increase in heat dissipation and current carrying capacity when the most economical thickness is provided. Take the heat transfer W coefficient, h =9.3 m²K

An electric cable of 20 mm diameter is insulated with rubber, which is exposed to the atmosphere at 300 C. Calculate the most economical thickness of rubber insulation (k = 0.175 W/m.K). When cable surface temperature with and without insulation is at 700 C. Also calculate the percentage increase in heat dissipation and current carrying capacity when the most economical thickness is provided. Take the heat transfer W coefficient, h =9.3 m²K

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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An electric cable of 20 mm diameter is insulated with rubber, which is exposed to the atmosphere at 300 C. Calculate the most economical thickness of rubber insulation (k = 0.175 W/m.K). When cable surface temperature with and without insulation is at 700 C. Also calculate the percentage increase in heat dissipation and current carrying capacity when the most economical thickness is provided. Take the heat transfer W coefficient, h =9.3 m²K
Transcribed Image Text:An electric cable of 20 mm diameter is insulated with rubber, which is exposed to the atmosphere at 300 C. Calculate the most economical thickness of rubber insulation (k = 0.175 W/m.K). When cable surface temperature with and without insulation is at 700 C. Also calculate the percentage increase in heat dissipation and current carrying capacity when the most economical thickness is provided. Take the heat transfer W coefficient, h =9.3 m²K
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