Academics – Applied Heat : 2022/JUL/06
Question
Q6) A copper wire of diameter 5 mm carries an electric current, and EACH metre length generates 6.5 watts of heat. The surrounding air is at 12℃ and the surface heat transfer coefficient is 13 W/m2 K.
(a) Determine the temperature of the wire. (6)
(b) The wire is to be covered with insulation 1.5 mm thick and K = 0.1 W/mK.
The outer heat transfer coefficient may be assumed to remain the same.
Calculate the reduced temperature of the wire. (10)
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