A supply fan motor for an air handling unit of a variable air volume system is rated at 20 HP with 88% energy efficiency. The fan is operated during 5500 h/year according to the following load profiles:

(a) 100% load, 5% of the time

(b) 80% load, 40% of the time

(c) 60% load, 50% of the time

(d) 40% load, 5% of the time Determine the energy use savings associated with the installation of adjustable speed drive (ASD). Consider both the theoretical and the actual performance of the ASD. Estimate the energy cost savings if the electricity price is \($0.12/kWh.\) Determine the simple payback period of installing the VSD at a total cost of \($13,500.\)