Thermodynamics 1

3. Consider a fan located in a 3 ft x 3 ft insulated square duct. Velocities at various points at the outlet are measured, and the average flow velocity is determined to be 22 ft/s. a) Taking the air density equal to 0.075 lbm/ft', estimate the minimum electric power consumption of the fan motor in Watt. b) With the same electric power consumption found previously, what would be the average flow velocity at the outlet, in ft/s, if the duct is not insulated and the rate of heat losses to the surrounding is foynd to be 15 W