A university campus has 300 classrooms and 600 faculty offices. The classrooms a

Question

A university campus has 300 classrooms and 600 faculty offices. The classrooms are equipped with 10 fluorescent tubes, each consuming120 W, including the electricity used by the ballasts. The faculty offices, on average, have half as many tubes. The campus is open 240 days a year. The classrooms and faculty offices are not occupied an average o h a day, but the lights are kept on. If the unit cost of electricity is$0.077/kWh, determine how much the campus will save a year if the lights in the classrooms and faculty offices are turned off during unoccupied periods. Cost savings = $/yr Round your answer to the nearest integer.

Explanation / Answer

Energy (consumption)/per day = [{300 x 10 x 120 + 600 x 5 x 120} x 24]/1000 kWh

=>E(c) saving /per day = [{300 x 10 x 120 + 600 x 5 x 120} x (24-5)]/1000 kWh

=>E(c) saving in a year = [{300 x 10 x 120 + 600 x 5 x 120} x 19 x 240]/1000 = 3283200 kwh

Cost of saving in a year = 3283200 x $0.077 = $252806

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