1. Phys 150 Lecture 71 Please sit together in pairs: –Onyema and Jason –Alejandra and Jiayuan –Chris and Erica –Ryan and John W. –John F. and Dian –Walter and Michael –Max and Honglu –Amanda and Matt –Pauline and Lin –Jennifer and Anwen –Alexandra and Mengyue –David and Melissa –Abigael and Erich –Jake and Irfan Phys 150 Lecture 221

2. 12-Apr-2011 Phys 150 Lecture 222 Announcements Homework 11 is due on Sunday, April 28 at midnight. Final Exam is Tuesday, May 7, 7:00 -10:00 PM, in class. Covers Chapters 1-10 and Chapters 6, 25 from MacKay.

3. 12-Apr-2011 Phys 150 Lecture 223 i>clicker question Solar PV for all your home energy A.is OK but very expensive. B.would require PV panels that fill your roof and most of your yard. C.is practical today at a reasonable cost. D.may someday be practical at a reasonable cost. Phys 150 Lecture 233

4. 12-Apr-2011 Phys 150 Lecture 224 i>clicker question Solar PV for all your home energy A.is OK but very expensive. B.would require PV panels that fill your roof and most of your yard. C.is practical today at a reasonable cost. D.may someday be practical at a reasonable cost. Phys 150 Lecture 234

5. Equinox House, Urbana, IL 8.2 kW solar PV Installed cost: $36,000 – 30% = $25,200 Federal Tax Credit Phys 150 Lecture 235

6. Equinox House, Urbana, IL 8.2 kW solar PV LED lights Efficient appliances Phys 150 Lecture 236

7. Equinox House, Urbana, IL 8.2 kW solar PV LED lights Efficient appliances Phys 150 Lecture 237 Heat pump clothes dryer

8. Equinox House, Urbana, IL 12 inch styrofoam walls and ceiling (R=44) Phys 150 Lecture 238 Insulation

9. Equinox House, Urbana, IL Super sealed walls and ceiling (note tubes of caulk) Phys 150 Lecture 239 12 inch styrofoam walls and ceiling (R=44) Insulation

10. 12-Apr-2011 Phys 150 Lecture 2210 i>clicker question Equinox House is heated with A.a natural gas furnace B.an electric resistance heater C.an air-source heat pump D.a ground-source heat pump (geothermal) Phys 150 Lecture 2310

11. 12-Apr-2011 Phys 150 Lecture 2211 i>clicker question Equinox House is heated with A.a natural gas furnace B.an electric resistance heater C.an air-source heat pump D.a ground-source heat pump (geothermal) – overkill for Equinox house Phys 150 Lecture 2311

12. Equinox House, Urbana, IL Air source heat pump Energy recovery ventilation Heat pump water heater COP ≈ 2

13. 12-Apr-2011 Phys 150 Lecture 2213 i>clicker question How much energy does Equinox House use compared with an average Illinois house? A.10% B.20% C.30% D.40% Phys 150 Lecture 2313

14. 12-Apr-2011 Phys 150 Lecture 2214 i>clicker question How much energy does Equinox House use compared with an average Illinois house? A.10% B.20% C.30% D.40% Phys 150 Lecture 2314

15. Equinox House, Urbana, IL 8.2 kW solar PV Average energy use for Equinox House: 1 kW Average energy use for IL house: 1 kW + 4 kW Electricity Natural Gas

16. 12-Apr-2011 Phys 150 Lecture 2216 i>clicker question Equinox House also supplies electricity for A.a hybrid car B.an electric car C.a plug-in hybrid electric car D.a golf cart

17. 12-Apr-2011 Phys 150 Lecture 2217 i>clicker question Equinox House also supplies electricity for A.a hybrid car – can’t be externally charged B.an electric car (EV) – 9,000 miles/year C.a plug-in hybrid electric car (PHEV) – also a possibility D.a golf cart - yes, if you like PHEV (example: Chevy Volt) – electric car for short trips, gasoline engine (hybrid) for longer trips

18. Urbana, IL 10 kW solar PV Supplies all of home’s energy except for cooking Phys 150 Lecture 2418

19. Insulated Concrete Form R = 22

20. 20 Ground source heat pump (geothermal) COP ≈ 4 T= 55 F

21. Champaign, IL 1.4 kW solar PV Supplies 1/3 of home’s electricity Phys 150 Lecture 2421

22. 22 AC solar panel Microinverter

23. Champaign, IL 1.4 kW solar PV Supplies 1/3 of home’s electricity DIY cost: $3300 – 30% = $2300 Federal Tax Credit Phys 150 Lecture 2423