Step two: Calculate the energy saved by all the schools computer turned off two hours earlier 72.128 kWh (from Step one) x 143 (# of computers in this school) = 10,314.3 kWh: This the energy saved per year saved when 143 computers are used 2 hours/day less. Step three: Now, let’s calculate the cost savings for this school 11,314.3 kWh saved (from Step 2) x $ .125 kWh (cost per kWh) = $1,289.29 What could your school do with an extra $1,300.00? Sometimes money talks! How would the environment benefit? What is the energy used by our school’s computers and printers? How many computers are in our school? How many printers are in our school? Does our school have a procedure for shutting down computers and printers at the end of the day? What time do our computers shut down automatically? Are people shutting down the computers when they leave the building? Are people shutting down the printers when they leave the building? How much energy would be saved if all the Step one: Calculate energy saved by turning computers and printers in the school were turned off one computer and one printer two hours off two hours earlier than the automatic shut down early. time? For one Computer : (81 W x ___ hours a day Data to use for calculations: beyond school x 184 number of days) divided Watts used by each computer 81 W by 1,000 (convert W to kW) = ________kWh Watts used by each printer 115 W For One Printer: (115 W x ___hours a day
Step two: Calculate the energy saved by all the schools computer turned off two hours earlier 72.128 kWh (from Step one) x 143 (# of computers in this school) = 10,314.3 kWh: This the energy saved per year saved when 143 computers are used 2 hours/day less. Step three: Now, let’s calculate the cost savings for this school 11,314.3 kWh saved (from Step 2) x $ .125 kWh (cost per kWh) = $1,289.29 What could your school do with an extra $1,300.00? Sometimes money talks! How would the environment benefit? What is the energy used by our school’s computers and printers? How many computers are in our school? How many printers are in our school? Does our school have a procedure for shutting down computers and printers at the end of the day? What time do our computers shut down automatically? Are people shutting down the computers when they leave the building? Are people shutting down the printers when they leave the building? How much energy would be saved if all the computers and printers in the school were turned off two hours earlier than the automatic shut down time? Data to use for calculations: Watts used by each computer 81 W Watts used by each printer 115 W Step one: Calculate energy saved by turning off one computer and one printer two hours early. For one Computer : (81 W x ___ hours a day beyond school x 184 number of days) divided by 1,000 (convert W to kW) = ________kWh For One Printer: (115 W x ___hours a day
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