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Q3 A Wire 12 mm in diameter is to be insulated to maximize its current carrying capacity. For certain reasons the outside diameter of insulation should be 36 mm, the heat transfer coefficient for the outer surface to be 12 w/m'C. what is the percentage would the insulation increase the energy carrying capacity of the wire Q4) A circumferential copper fins (1.5 cm long and 3mm thick) of rectangular profile are mounted on a 2.5 m tube having a diameter of 3 cm. The fins are exposed to convection environment at 22°C, with heat transfer coefficient 58 W/m?.°C. Determine the increase in heat transfer from the tube as a result of adding fins if the number of fins are 250. Thermal conductivity 386 W/m.°C , T°= 100 °C -1-

Q3 A Wire 12 mm in diameter is to be insulated to maximize its current carrying capacity. For certain reasons the outside diameter of insulation should be 36 mm, the heat transfer coefficient for the outer surface to be 12 w/m'C. what is the percentage would the insulation increase the energy carrying capacity of the wire Q4) A circumferential copper fins (1.5 cm long and 3mm thick) of rectangular profile are mounted on a 2.5 m tube having a diameter of 3 cm. The fins are exposed to convection environment at 22°C, with heat transfer coefficient 58 W/m?.°C. Determine the increase in heat transfer from the tube as a result of adding fins if the number of fins are 250. Thermal conductivity 386 W/m.°C , T°= 100 °C -1-

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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Q3 A Wire 12 mm in diameter is to be insulated to maximize its current carrying capacity. For certain reasons the outside diameter of insulation should be 36 mm, the heat transfer coefficient for the outer surface to be 12 w/m'C. what is the percentage would the insulation increase the energy carrying capacity of the wire Q4) A circumferential copper fins (1.5 cm long and 3mm thick) of rectangular profile are mounted on a 2.5 m tube having a diameter of 3 cm. The fins are exposed to convection environment at 22°C, with heat transfer coefficient 58 W/m?.°C. Determine the increase in heat transfer from the tube as a result of adding fins if the number of fins are 250. Thermal conductivity 386 W/m.°C , T°= 100 °C -1-
Transcribed Image Text:Q3 A Wire 12 mm in diameter is to be insulated to maximize its current carrying capacity. For certain reasons the outside diameter of insulation should be 36 mm, the heat transfer coefficient for the outer surface to be 12 w/m'C. what is the percentage would the insulation increase the energy carrying capacity of the wire Q4) A circumferential copper fins (1.5 cm long and 3mm thick) of rectangular profile are mounted on a 2.5 m tube having a diameter of 3 cm. The fins are exposed to convection environment at 22°C, with heat transfer coefficient 58 W/m?.°C. Determine the increase in heat transfer from the tube as a result of adding fins if the number of fins are 250. Thermal conductivity 386 W/m.°C , T°= 100 °C -1-
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