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Answer :
When we replace the 100 60-watt incandescent lamps with 100 15-watt fluorescent lamps, the energy savings for one month would be approximately 1,285.01 kWh.
What is the energy savings for one month?
When we are calculating the energy saving in a month, we have to compare the consumption of energy of the previous lamps to the new ones.
The consumption of energy in the old lamps is calculated as;
Power consumption per lamp = 60 watts
Number of lamps = 100
Hours of operation per day = 11
Days of operation per week = 6
Energy consumption per week = Power consumption per lamp * Number of lamps * Hours of operation per day * Days of operation per week
Energy consumption per week = 60 watts * 100 lamps * 11 hours/day * 6 days/week
Energy consumption per week = 396,000 watt-hours
The energy consumption of the new fluorescent lamps can be calculated as follows:
Power consumption per lamp = 15 watts
Number of lamps = 100
Hours of operation per day = 11
Days of operation per week = 6
Energy consumption per week = Power consumption per lamp * Number of lamps * Hours of operation per day * Days of operation per week
Energy consumption per week = 15 watts * 100 lamps * 11 hours/day * 6 days/week
Energy consumption per week = 99,000 watt-hours
Energy savings per week = Energy consumption per week (old) - Energy consumption per week (new)
Energy savings per week = 396,000 watt-hours - 99,000 watt-hours
Energy savings per week = 297,000 watt-hours
Let's multiply the weekly savings by 4.
Energy savings for one month = Energy savings per week * Number of weeks in a month
Energy savings for one month = 297,000 watt-hours * 4 weeks
Energy savings for one month = 1,285,010 watt-hours
Let's divide by 1000 to change the w-h to kw-h;
Energy savings for one month = 1,285,010 watt-hours / 1,000
Energy savings for one month = 1,285.01 kWh
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