Question: A duct with a square cross-section (20 cm x 20 cm) covers electrical wires. A cooling air at 30C flows over the duct to

A duct with a square cross-section (20 cm x 20 cm) covers electrical wires. A cooling air at 30C flows over

A duct with a square cross-section (20 cm x 20 cm) covers electrical wires. A cooling air at 30C flows over the duct to keep the surface temperature at 65C. The velocity of the air is 200 m/min and the length of the duct is 1.5 m. Calculate the total power of the electrical wires.

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