# Basic EE Question (Related to Energy Consumption)

1. Sep 15, 2014

### ronny2412

1. The problem statement, all variables and given/known data

You are an electrical engineer in a small manufacturing facility that uses an average energy consumption of 100 MW-hr/day to run the facility (365 days a year). Of this amount, 20% goes towards fluorescent lighting. The cost that the facility pays is costs \$0.21 kW-hr. You find a small company that has developed a new switch- ing power converter for supplying energy to the fluorescent lights. The converter allows a 25% reduction in energy consumption of this type of lighting.
(a) The facility would like to recover the costs of the project after 1 year, how much capital invest could you spend to upgrade and install the new power converters? You can ignore the effect of interest rates for the year!
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2. Relevant equations

3. The attempt at a solution
I first found the total energy consumed by the facility in one year.
Then I found the energy consumed by fluorescent light in 1 year & its cost.

Then I found the new consumption cost of the fluorescent light. (taking into account the 25% reduction).
I then found the TOTAL cost incurred by the facility with new config (inclusion of power converters)

After this I am stuck. I am pretty much unable to arrive on what the question asks you to find.