Examples. Economics and EROEI for Conservation and Solar Power Systems. Low Flow Shower Heads. Simplified Energy and Cost Analysis. For Low Flow Shower Heads Typical household can save 40% per shower, or 9 gallons. Assume water temperature in is 70° F and heated to 120 ° F.
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Economics and EROEI for Conservation and Solar Power Systems
$ payback is
Cost of Saved Energy=
This is less than 1/10th the electricity
Replace a standard A Lamp with a CFL Lamp.
A Lamp uses 75 Watts, $0.50
CFL Lamp uses 20 Watts, $15
Price of Electricity 8.4¢/kWh
A Lamp life 8 months (2/3 yr)
CFL Lamp life 10 years
Reduction in Energy Cost per year if lamp operates 3hr/day on 1,100hr/yr
Reduction in equipment cost
Levelized cost (CCE)
Effective discount rate, i =3%
Life Time, t=10 yr
Economics and Energy return on