Repeat Problem 10.3 but with motors with

(a) 2 poles and

(b) 6 poles. Comment on the impact of the number of poles.

Problem 10.3

Determine the reduction in the annual energy costs due to staggered duty cycling of six identical fan motors, each rated at 20 hp and has 4 poles. The motor manufacturer specifies 20 minutes on and 10 minutes off as the minimum duty cycle. The utility monthly demand charge is $15/kW.