1. By: Wyatt Berlinic and Lyndon Chan

2. Outline Possible interpretations – Global – Home – University – Engineering Our interpretation – Focus on computers in the engineering building – Extrapolate this data to the rest of the campus. Chose this interpretation because we could make the measurements and do actual calculations.

3. What we did We purchased a blue planet EM100 energy meter from Canadian Tire We then sampled different computers around the Engineering Building for power consumption

4. Assumptions Computers with the same CPU and GPU consumed the same amount of power The computers are not used 70% of the time Power consumption would not increase by much when in use The cost of electricity is 10.61 cents/kWh

5. Power Measurements (Computers) Lab# of computersIdle Power/Computer (W)Total Lab Power (W) Alpha32511 632 Beta851408 Gamma1651816 Delta30511 530 Epsilon45512 295 Zeta1251612 Tau1451714 EE labs1279948 Total181---8 955 Xi lab could not be measured, as it is running on the servers

6. Power Measurements (Monitors) Each monitor uses about 35W of power when the computer is in use and when a screen saver is on. The monitors use almost no power when asleep. We measured 0W. We have counted 231 monitors in the Engineering labs, giving us a total of ~8 kW

7. Power Measurements (Totals) Lab# of desktopsIdle Power /desktop (W)Total Lab Power (W) Alpha321213 872 Beta886688 Gamma161211 936 Delta30862 580 Epsilon45863 870 Zeta12861 032 Tau141211 694 EE labs121141 368 Total181---17 040

8. Energy Use and Cost Time spanTotal Energy (kWh)Total Cost ($) 1 day (24h)40943 1 month (30d)12 2691 302 1 year (365d)149 27015 838 Time spanWasted Energy (kWh)Total Cost ($) 1 day (24h)28630 1 month (30d)8 588911 1 year (365d)104 48911 086

9. Comparison of Results A typical household uses an average power of 1kW 1 The computers here use as much power as nine households, and 17 households with monitors The total energy wasted in a year is equal to 119 100W light bulbs running all year round

10. Estimation of University Computers Estimated total number of computers on campus from Student Computing website Since the computers generally have one monitor, we estimate each computer to use 80W 68 labs X 20 computers per lab = 1360 total computers Total power 109 kW Yearly energy 953 088 kWh Yearly cost $101 123

11. Power Saving Recommendations Put computers to sleep 30 minutes after logging off Power usage in sleep mode is about 5W including monitors 2 In engineering, 96 561 kWh could be saved each year saving $10 245

12. Conclusions A large portion of the university’s power is wasted by leaving computers on all the time This wasted power can be mostly saved by sleeping computers when idle Remote desktop is important, so software could be added to wake sleeping computers

13. References [1] K. J. Cassidy (2005). What’s a Watt [Online]. Available: www.solartanic.com/index_022.htm [2] M. Bluejay (2011). How much electricity do computers use? [Online]. Available: michaelbluejay.com/electricity/computers.html