1. Bringing Energy Into the Classroom Robert K. Kaufmann Boston University August 11, 2014 http://www.bu.edu/cees/people/faculty/kaufmann/index.html

2. Bringing Energy Into the Classroom - - Understanding energy - - Touch measures of energy efficiency - Building energy use - - A home energy audit - - How much energy do I use directly

3. What is Energy? Anything that has the ability to do work

4. Measuring Energy CalorieThe heat required to raise the temperature of one gram of water one degree Celsius

5. Reading Food Labels Ask students to bring in their favorite food

6. Human Body Temperature ‘Normal’ body temperature 37 o C Active Range 36 o C - 38 o C Stability Range 34 o C - 41 o C Critical thermal maximum 43 o C Critical thermal minimum 28 o C

7. So Let’s Do a Simple Calculation How much do you weigh? ________(kilograms) What is normal room temperature? ____ (degrees Celsius) What percentage of your body is water ______ (percentage 60M 55F) How many calories are needed to maintain each gram of your body __? How many calories do you need to eat ____?

8. Touch Measure of Energy Efficiency

9. Law of Conservation Matter is neither created nor destroyed in a physical or chemical transformation

10. Second Law of Thermodynamics In all energy conversion processes, energy loses its ability to do work and is degraded in quality

11. Energy In Equals Energy Out Energy In Work out Waste Energy (Heat) Machine Efficiency = Work out/Energy in

12. Energy Flows in Light Bulbs Electricity In Light Waste Energy (Heat) Light Bulb Efficiency = Work out/Energy in

13. Lightbulbs Incadescent bulb Compact Flourescent Halogen bulb

14. Light Bulb Efficiency

15. What Kind of Bulb to Buy? How much does the bulb cost? How much does electricity cost? How long does the bulb last? How often is the bulb on? What is the interest rate?

16. A Calculation? dollars/megalumen-hour=( initial-dollars+watts-consumed*dollars-per-kilowatt-hour*thousand-hours-lifetime) ( average-lumens * thousand-hours-lifetime / 1000 ) 60-watt incandescent bulb, 800 lumens, 1,000 hours lifetime, $1.00 initial cost: ( $1.00 + 60 * $0.10 * 1 ) / ( 800 * 1 / 1000 ) = ( $1.00 + $6.00 ) / 0.8 = $8.75 / megalumen-hour 15-watt CFL bulb, 800 lumens (680 average), 6,000 hours lifetime, $5.00 initial cost: ( $5.00 + 15 * $0.10 * 6 ) / ( 680 * 6 / 1000 ) = ( $5.00 + $9.00 ) / 4.08 = $3.43 / megalumen-hour

17. Building Energy Use

18. Daily Electricity Use

19. Weekly Electricity Use

20. Annual Electricity Use

21. Personal Energy Audit - - How much energy do you use to move around? - - How much energy do you use to heat your house ? - - How much energy do you use to cool your house?

22. Energy Used to Move Track how far you go each week by type of vehicle

23. Home Energy Audit Obtain Information - Electric Company (monthly bills) - Gas Company (monthly bills) - Oil Company (monthly bills) - - Weather Data (daily temperature) - Size of home (square meters)

24. Weather Data Heating Degree Days = 65 o F – Outside Temperature Cooling Degree Days = Outside Temperature – 65 o F

25. Measuring Energy Use Heating Degree Days or Cooling Degree Days per Month Energy Use per Month Slope = Energy Use HDD HDD

26. Comparisons