Thermal energy generated by the electrical resistance of a 5-mm-diameter and 4-m long bare cable is dissipated to the surrounding air at 20°C. The voltage drop and the
electric current across the cable in steady operation are measured to be 18V and 5A,
respectively. Disregarding radiation, estimate the surface temperature of the cable.
Evaluate air properties at a film temperature of 70°C and 1 atm pressure.
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Given:
Thermal energy generated by electric resistance of cable
Diameter of cable
Length of cable
Voltage drop across the cable
Electric current across the cable
Surrounding temperature
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