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If a customer replaces a 100 watt bulb with an 18 watt compact fluorescent bulb that lasts 5000 hours, how muc?
If a customer replaces a 100 watt bulb with an 18 watt compact fluorescent bulb that lasts 5000 hours, how much less coal (lbs)will be used to generate the electricity that is saved? Assume the electricity is generated with 33% efficiency and the energy content of the coal is 30 kJ/g.
Calculate energy savings over lifetime of bulb. Calcualte mass of coal saved, including estimate of efficiency.
** Each lamp runs for 5000 hours.
Energy in kWh
Bulb =100W/1000 * 5000 hrs = 500 kWH
CFL = 18W/1000 * 5000 hrs = 90kWH
Energy saving =500 - 90 = 410 kWH
Allow for 33% generated efficiency, 410/33 * 100 = 1242 42 kWH
1242 42 kWH = (1242 42 kWH * 3.6E6 /1000) kJ =4,472,727.273 kJ
4,472,727.273 kJ = 4,472,727.273 kJ / (30 * 1000) = 149.10kg
149.10kg = 149.01kg * 2.205 = 328.77lb.
The 100W CFL is about 22% eff , and supply efficiency of 33%,
Overall Eff = 0.22 * 0.33 *100 % = 7.26%
Please request clarification, if required.
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