A lossless motor drives the fan shown in Fig. P12.40 at40 Hz. The power input to the

Chapter 12, Problem 12.40

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A lossless motor drives the fan shown in Fig. P12.40 at40 Hz. The power input to the motor is 40 amps at 440 volts. Forthe geometry shown, what is the discharge flow rate of air throughthe fan? Assume that the tangential component of the velocity leavingthe impeller is equal to that of the impeller at that point. Theexit air temperature T2 = 15 C.

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