CLEI/EE 81c Special Report Personal Energy Use Audit

1. The mission of this report is to make you aware of your energy use and how to use energy more efficiently, thus reducing you carbon footprint CLEI/EE 81cSpecial ReportPersonal Energy Use Audit Special Thanks to Prof. Ali Shakouri & OxanaPantchenko

2. Special Report The objective of this report is for students to get a full picture of the supply and demand of energy used in their daily life. While working on this report, students will • Identify all energy services and their energy sources • Obtain historical records of energy usage, • Determine the energy consumption for each service, • Analyze the information, • Draw conclusions and • Make recommendations.

3. Special Report Due: Tuesday, May 19th, 2011 at beginning of class. Report is to be written on paper Grading: 20% of your final grade Homework 25% Midterm 25% Energy Audit 20% Final 30% This is a revision of original estimate.

4. Special Report Outline • Abstract (10 pts) • Introduction (should include information about student) (10pts) • Calculations and Analysis • List of energy services and sources (10 pts) • Transportation (10 pts) • Hot water consumption (15 pts) • Electricity usage (kWh / day ) & (J / week) • Calculated from labels (5 pts) • Measured with “Kill a Watt”  (10 pts) • When appliances are on • When appliances are off • Total Carbon emission (5 pts.) • Conclusion (should include qualitative and quantitative analysis summary from previous section). Should answer following questions (25 pts) • Which energy services are the biggest energy users? • How would you expect energy use for each service to change though out the year? • Any surprises or noteworthy points? • From working on this project, would you now consider alternative energy sources for particular services? • From the calculations above, suggest a replacement for one of the high energy appliances?  • Would you now consider a habit or lifestyle change? • Compare your results to the data collected by David MacKay?

5. Calculations and AnalysisList of energy services and sources

6. Calculations and AnalysisList of energy services and sources

7. Calculations and Analysis Transportation (15 pts) Driving Busses, Trains

8. Calculations and Analysis Transportation (15 pts) Driving 5 mi daily Scotts Valley to Santa Cruz 10 mi * 4 days/week = 40 mi / week Car: 30 miles / gallon 1.33 gallons = 5 L of gas / week 35 MJ/L energy content 86 Octane gas 35 MJ/L * 5 L = 175 MJ Carpool: 175 MJ / 2 = 87.5 MJ Busses, Trains 1.6 MJ / km for each passenger

9. Hot Water Consumption (15pts) Heat Energy • Q = m x cp x (T 1 – T2) • cp : specific heat constant, 4190 J / kg C • T 1 : temperature of the hot water • T 2 : temperature of the cold water Example Johan uses 50 L of hot water per day from an electric hot water system. The water is heated from 18C to 60C. The heat energy contained in the water, Q = m x cp x (T 1 – T2) Efficiency of Electric Water Heater is 0.7 to 0.8 Efficiency of Gas Water Heater is 0.6 to 0.75

10. Hot Water Consumption (15pts) Heat Energy • Q = m x cp x (T 1 – T2) • cp : specific heat constant, 4190 J / kg C • T 1 : temperature of the hot water • T 2 : temperature of the cold water Example Johan uses 50 L of hot water per day from an electric hot water system. The water is heated from 18C to 60C. The heat energy contained in the water, Q = m x cp x (T 1 – T2) Q = 50 kg x 4190 x (60 C – 18C) Q = 8.8 MJ / day Q = 61.6 MJ/ week Efficiency of Electric Water Heater is 0.7 to 0.8 61.6 MJ / 0.8 = 77 MJ Efficiency of Gas Water Heater is 0.6 to 0.75

11. Electricity Usage (total 30 pts)

12. Electricity Usage (total 30 pts) Calculated from labels (15 pts)

13. Electricity Usage cont. • If an item operates on AC, use the following formula with an estimate of the power factor, Power = Voltage (V) x Current (A) x Power Factor • If the appliance contains a motor, then use 0.8 unless it is either very cheap or very small, then use 0.6 • If the appliance is some electronic item, (TV, battery charger), use 0.85 • If the appliance contains only heating element or light, then use 1.

14. Electricity Usage (total 30 pts) • Measured with “Kill a Watt” meter (15 pts) • When appliances are on • When appliances are off • Check out from TA or Tutorsat section or tutorials or fromProf. Vesecky at office hoursbeginning next week • You have 3 days to use it orover the weekend – otherswill be waiting so be quick. • Use of meter can be done in aday or two. • Missing Kill a Watt meters willbe charged to your studentaccount

15. Electricity Usage (total 30 pts)

16. Electricity Usage (total 30 pts)

17. Electricity Usage (total 30 pts)

18. Electricity Usage (total 30 pts)

19. Electricity Usage (total 30 pts)

20. Conclusion • Should include qualitative and quantitative analysis summary from previous sections • Should answer following questions (15 pts) • Which energy services are the biggest energy users? • How would you expect energy use for each service to change though out the year? • Any surprises or noteworthy points? • From working on this project, would you now consider alternative energy sources for particular services? • From the calculations above, suggest a replacement for one of the high energy appliances?  • Would you now consider a habit or lifestyle change?

21. Compare your results to the data shown below. Average Power Consumption (UK) Conclusion David MacKay, Sustainable Energy –Without the Hot Air

22. Help on Energy Audit • TA Erik Matlin in section meetings • Tutors Alex Swanson and Alyssa Gularte in small group tutorials and Prof. Vesecky at office hours • Written Energy Audit Guide on website. • This Slide Show guide