Total Carbon Emissions saved by Project Light Switch

Today the form 4 chemistry class worked out how much CO2 we will save with Project Light Switch through a simple math process that YOU can do for YOUR school!

1. Its fairly simple, for the first step you need to find out how many bulbs you've replaced and their wattage per bulb, and assign them a name so that it is easier to work with. We went with A,B,C and D but your free to chose what you want.
   
2. Make a graph to make it easier to see and organize.

Bulbs # Replaced Watts saved per bulb Total Saved
A 7 40W 40W x 7 = 280W
B 25 90W 90W x 25 = 2250W
C 8 55W 55W x 8 = 440W
D 9 7W 7W x 9 = 63 W

Total: 49 192W 3033W

3. Now that you've completed your chart you need to find how long on average they are on for in a year. Our school day is about seven hours long plus about two hours of teachers and students working before and after school so we said 9 hours a day. Now not all of the light are used all day so we estimated that each one would be on for half of the day( 4.5 h/day).

4. After that you have to fine how many days the lights are used in the year. There is just 10 months to the school year, minus our two breaks, Christmas break being 3 weeks (0.75 months) and March break being ( 0.5 months). Now convert that to how many days it would be.

10 months - .75 months - .5 months
OR = 266.5 Days
304 days - 22.5 days - 15 days

5. Of course don't forget that we only attend school on the weekdays.

266.5 ( 5/7) = 190 Days

6. Convert that to hours.

Hours = 4.5h (hours on per day) x 190 days = 855

7. So from all of this we know know that we save 3033W running for 855 hours. Your almost there but for the web site we found to exactly calculate our
( www.carbonify.com/carbon-calculator.htm ) carbon emissions you need to find how much kilowatt hours because that is what the websites asks for.

3033W (855h) = 2 593 215 kWh per year Or to 2.59 million kWh

8. Find that number per month is...

2593215/12 = 216 101 kWh per month

9. Plug that into the website and we got...

1,944.909 total tons of CO2 annually

10. Change that to kilograms easily by multiplying 1,945 tons by how many kilograms are in a ton ( 907 ) and you get....

1 764 115 kg of CO2 !!!!!!!

11. And last but definitely not least CELEBRATE for doing a great job for the environment!