ENERGY CONSERVATION = FISCALLY CONSERVATIVE A COMPARISON OF COMPACT FLUORESCENT AND INCANDESCENT BULBS BY JONI JOHNSON, PETERSBURG MAT STUDENT
LIGHTING_ENERGY_CONSERVATION
May 15, 2015
ED630 Assignment
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ENERGY CONSERVATION = FISCALLY CONSERVATIVEENERGY CONSERVATION = FISCALLY CONSERVATIVE
A COMPARISON OF COMPACT FLUORESCENT AND INCANDESCENT
BULBS
BY JONI JOHNSON, PETERSBURG MAT STUDENT
A COMPARISON OF COMPACT FLUORESCENT AND INCANDESCENT
BULBS
BY JONI JOHNSON, PETERSBURG MAT STUDENT
LIGHTINGLIGHTING
What type of light do you use in your home?
How much do you spend on lighting in your home?
If you could save, would you?
What type of light do you use in your home?
How much do you spend on lighting in your home?
If you could save, would you?
STUDY OBJECTIVESSTUDY OBJECTIVES
$$$$ = the fiscally conservative conservationist Having heard that compact fluorescent bulbs save energy, and having heard that they cost more money…
$$$$ = the fiscally conservative conservationist Having heard that compact fluorescent bulbs save energy, and having heard that they cost more money…
STUDY OBJECTIVESSTUDY OBJECTIVES
We set out to find1. The difference in kilowatt hour (kWh)
consumption between the two bulbs
2. The different in cost between the two bulbs
3. When, and if, over the life of the two bulbs the compact fluorescent would be more cost effective than the incandescent bulbs
We set out to find1. The difference in kilowatt hour (kWh)
consumption between the two bulbs
2. The different in cost between the two bulbs
3. When, and if, over the life of the two bulbs the compact fluorescent would be more cost effective than the incandescent bulbs
LIGHTINGLIGHTING The typical household averages an estimated 25, 40-watt incandescent light bulbs* Therefore we selected 40-watt bulbs as our base for this study
*(sampled from four integrated science students’ homes, so not representative)
The typical household averages an estimated 25, 40-watt incandescent light bulbs* Therefore we selected 40-watt bulbs as our base for this study
*(sampled from four integrated science students’ homes, so not representative)
STUDY METHODSSTUDY METHODS
To determine the difference in kWh consumption we: Searched the web to find a trustworthy source of
Lumens Watts (W) Bulb lifespan in hours
To determine the difference in kWh consumption we: Searched the web to find a trustworthy source of
Lumens Watts (W) Bulb lifespan in hours
STUDY METHODSSTUDY METHODS
To determine the difference in cost between the two bulbs we: Located the cheapest supplier for both bulb types
Contacted the Petersburg Utility for current kWh rates
To determine the difference in cost between the two bulbs we: Located the cheapest supplier for both bulb types
Contacted the Petersburg Utility for current kWh rates
STUDY METHODSSTUDY METHODS
To determine when the compact fluorescent would be more cost effective than the incandescent bulb we: Combined the above two methods and calculated away…
To determine when the compact fluorescent would be more cost effective than the incandescent bulb we: Combined the above two methods and calculated away…
LIGHTING RESULTSLIGHTING RESULTS
The 40-watt incandescent is slightly less bright than the 11-watt compact fluorescent 505 lumens compared to 660 lumens, respectively
The 40-watt incandescent is slightly less bright than the 11-watt compact fluorescent 505 lumens compared to 660 lumens, respectively
LIGHTING RESULTSLIGHTING RESULTS
The 40-watt bulb has an estimated lifespan of 1000 hours
The 11-watt compact fluorescent has an estimated lifespan of 15000 hours
The 40-watt bulb has an estimated lifespan of 1000 hours
The 11-watt compact fluorescent has an estimated lifespan of 15000 hours
RESULTS: CONSUMPTIONRESULTS: CONSUMPTION
KWH CONSUMPTION COMPARISON: per 1000 hours
The 40W incandescent bulb consumes 40 kWh
The 11W compact fluorescent bulb consumes 11 kWh
KWH CONSUMPTION COMPARISON: per 1000 hours
The 40W incandescent bulb consumes 40 kWh
The 11W compact fluorescent bulb consumes 11 kWh
RESULTS: CONSUMPTIONRESULTS: CONSUMPTION
Extrapolated over the lifespan of the compact fluorescent bulb (15000 hours)…
Extrapolated over the lifespan of the compact fluorescent bulb (15000 hours)…
Comparison of kWh consumption: compact fluorescent (cf) vs. incandescent
0
100
200
300
400
500
600
700
1 3 5 7 9 11 13 15
hours in 1000's
kWh
cf
incandescent
RESULTS: CONSUMPTIONRESULTS: CONSUMPTION
Over the lifespan of the compact fluorescent bulb 15 incandescent bulbs have been used
600 kWh have been consumed by the incandescent bulb as opposed to 165 kWh by the compact fluorescent
Over the lifespan of the compact fluorescent bulb 15 incandescent bulbs have been used
600 kWh have been consumed by the incandescent bulb as opposed to 165 kWh by the compact fluorescent
RESULTS: COSTRESULTS: COST
COST $$$ The 40W incandescent bulb costs roughly $ 0.84/bulb
The 11W compact fluorescent bulb costs roughly $2.19/bulb
COST $$$ The 40W incandescent bulb costs roughly $ 0.84/bulb
The 11W compact fluorescent bulb costs roughly $2.19/bulb
RESULTS: COSTRESULTS: COST
With 15 incandescent bulbs lasting as long as 1 compact fluorescent…
$0.84*15 = $12.60 As opposed to $2.10
With 15 incandescent bulbs lasting as long as 1 compact fluorescent…
$0.84*15 = $12.60 As opposed to $2.10
RESULTS: COSTRESULTS: COST
FISCALLY SOUND
Between two and three 40W incandescent bulbs expire and the compact fluorescent pays for itself
FISCALLY SOUND
Between two and three 40W incandescent bulbs expire and the compact fluorescent pays for itself
COST: ENERGY CONSUMPTIONCOST: ENERGY CONSUMPTION
At the current 11.3 cents/kWh in Petersburg: Over 1000 hours
A 40W incandescent costs $4.52 A 11W compact costs $1.24
At the current 11.3 cents/kWh in Petersburg: Over 1000 hours
A 40W incandescent costs $4.52 A 11W compact costs $1.24
COST: ENERGY CONSUMPTIONCOST: ENERGY CONSUMPTION
With the purchase price of 0.84/bulb for the 40W incandescent
2.19/bulb for the 11W compact
The cost per 1000 hours = $5.36 using the 40W incandescent $3.43 using the 11W compact
With the purchase price of 0.84/bulb for the 40W incandescent
2.19/bulb for the 11W compact
The cost per 1000 hours = $5.36 using the 40W incandescent $3.43 using the 11W compact
FISCALLY AND ENVIRONMENTALLY CONSERVATIVE
FISCALLY AND ENVIRONMENTALLY CONSERVATIVE
Comparison of the cost to operate: compact fluorescent vs. incandescent
0
10
20
30
40
50
60
1 2 3 4 5 6 7 8 9 10
time in 1000 increments (hours)
cost ($)
cf
incandescent
FISCALLY AND ENVIRONMENTALLY CONSERVATIVE
FISCALLY AND ENVIRONMENTALLY CONSERVATIVE
Back to our estimated 25 bulbs per household…
Back to our estimated 25 bulbs per household…
FISCALLY AND ENVIRONMENTALLY CONSERVATIVE
FISCALLY AND ENVIRONMENTALLY CONSERVATIVE
Comparison: cost of compact fluorescent vs. incandescent bulbs
0
200
400
600
800
1000
1200
1400
1 2 3 4 5 6 7 8 9 10
time in 1000's (hours)
cost ($)
cf
incandescent
FISCALLY AND ENVIRONMENTALLY CONSERVATIVE
FISCALLY AND ENVIRONMENTALLY CONSERVATIVE
A household that currently uses 25, 40W incandescent bulbs Would save
$932!!!!
Over 10,000 hours of use
If they used compact fluorescent bulbs
A household that currently uses 25, 40W incandescent bulbs Would save
$932!!!!
Over 10,000 hours of use
If they used compact fluorescent bulbs
CONCLUSIONSCONCLUSIONS
In spite of the initial high purchase price Brighter compact fluorescent bulbs pay for themselves within one year
In spite of the initial high purchase price Brighter compact fluorescent bulbs pay for themselves within one year
CONCLUSIONS - SO SIMPLE?CONCLUSIONS - SO SIMPLE?
If you do not leave a compact fluorescent bulb on for at least five minutes
The lifespan decreases signficantly
If you do not leave a compact fluorescent bulb on for at least five minutes
The lifespan decreases signficantly
CONCLUSIONS - SO SIMPLE?CONCLUSIONS - SO SIMPLE?
Compact fluorescent bulbs contain small amounts of mercury They need to be disposed of at the proper facility
Such facility you’re not likely to encounter in Petersburg
Hmmm… A dilemma.
Compact fluorescent bulbs contain small amounts of mercury They need to be disposed of at the proper facility
Such facility you’re not likely to encounter in Petersburg
Hmmm… A dilemma.
referencesreferences
Jim Nelson, Petersburg Municipal Utility
www.energystar.gov/index.cfm?c=cfls.pr_cfls
http://energyhawk.com/lights/lights2.php
Jim Nelson, Petersburg Municipal Utility
www.energystar.gov/index.cfm?c=cfls.pr_cfls
http://energyhawk.com/lights/lights2.php