CLEI/EE 81c

Special Report

Personal Energy Use Audit

Special Thanks to Prof. Ali Shakouri &Oxana Pantchenko

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

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.

Special Report

Special ReportDue: 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.

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?

Calculations and AnalysisList of energy services and sources

Services Sources

Calculations and AnalysisList of energy services and sources

Services Sources

Water Heating Natural gas

Space Heating Natural gas

Lighting Electricity

…. ….

Calculations and Analysis Transportation (15 pts)Driving

Busses, Trains

Calculations and Analysis Transportation (15 pts)Driving

5 mi daily Scotts Valley to Santa Cruz10 mi * 4 days/week = 40 mi / weekCar: 30 miles / gallon 1.33 gallons = 5 L of gas / week35 MJ/L energy content 86 Octane gas35 MJ/L * 5 L = 175 MJ Carpool: 175 MJ / 2 = 87.5 MJ

Busses, Trains1.6 MJ / km for each passenger

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

ExampleJohan 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

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

ExampleJohan 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 / dayQ = 61.6 MJ/ weekEfficiency of Electric Water Heater is 0.7 to 0.8

61.6 MJ / 0.8 = 77 MJEfficiency of Gas Water Heater is 0.6 to 0.75

Electricity Usage (total 30 pts)

Appliance

#Power

(W)

Daily Usage

(h)

Daily Energy (Wh)

Weekly Energy (Wh)

Weekly Energy

(J)

Computer 1

Vacuum Cleaner

1

Electric Drill

1

Total

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

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.

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

Electricity Usage (total 30 pts)

Appliance

#Power

(W)

Daily Usage

(h)

Daily Energy (Wh)

Weekly Energy (Wh)

Weekly Energy

(J)

Computer 1 120

Vacuum Cleaner

1 1000

Electric Drill

1 600

Total

Electricity Usage (total 30 pts)

Appliance

#Power

(W)

Daily Usage

(h)

Daily Energy (Wh)

Weekly Energy (Wh)

Weekly Energy

(J)

Computer 1 120 3

Vacuum Cleaner

1 1000 0.14

Electric Drill

1 600 0.07

Total

Electricity Usage (total 30 pts)

Appliance

#Power

(W)

Daily Usage

(h)

Daily Energy (Wh)

Weekly Energy (Wh)

Weekly Energy

(J)

Computer 1 120 3 360

Vacuum Cleaner

1 1000 0.14 140

Electric Drill

1 600 0.07 42

Total 542 W*h

Electricity Usage (total 30 pts)

Appliance

#Power

(W)

Daily Usage

(h)

Daily Energy (Wh)

Weekly Energy (Wh)

Weekly Energy

(J)

Computer 1 120 3 360 2520

Vacuum Cleaner

1 1000 0.14 140 140

Electric Drill

1 600 0.07 42 42

Total 542 W*h

Electricity Usage (total 30 pts)

Appliance

#Power

(W)

Daily Usage

(h)

Daily Energy (Wh)

Weekly Energy (Wh)

Weekly Energy

(J)

Computer 1 120 3 360 2520 9.07 M

Vacuum Cleaner

1 1000 0.14 140 140 0.5 M

Electric Drill

1 600 0.07 42 42 0.15 M

Total 542 W*h 9.72 MJ

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?

Conclusion Compare your results to the data shown below.

Average Power Consumption (UK)

David MacKay, Sustainable Energy –Without the Hot Air

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