1. Energy Conservation February 8, 2011

2. Steve Wilson, MBA, CEM, CDSM, BEP The Energy Guy

4. How We Use Energy in Our Homes Heating & Cooling Water Heater Refrigerator Dish Washing 2% Clothes Washing Lighting Other: TV, VCR, Computer, DVD, chargers, video games, Etc. 45% 19% 7% 10% 6%11%

5. Climate Zone Ames is in climate zone 5.

6. Residential Building Code 2009 IECC – –(International Energy Conservation Code). CeilingR38 WallR20 FloorR30 BasementR10/13 SlabR10 (2 ft) CrawlspaceR10/13 Window U factor.35

7. Heat Transfer We lose heat from our homes in winter and gain it during summer HVAC equipment used to maintain comfort – –Replaces heat lost in winter and cools heat gained in summer Build to take advantage of the sun Use materials that resist heat transfer

8. Heat Loss/Gain How does a home lose/gain heat? – –Conduction Low levels of insulation Windows – –Convection Convection currents – –Drafts by windows – –Upstairs warmer than downstairs – –Radiation Warm home radiating heat to surrounding atmosphere and ground

9. Home Heat Loss 10% lost through floor (rim joist) 20% through windows and doors 25% lost through walls 35% lost through ceilings 10% lost through infiltration

10. Reducing Heat Loss From The Home Heat can be lost through many places at home. These include: – –Roof – –Walls – –Gaps around doors and windows – –Floors – –Windows

11. Reducing Heat Loss From The Home Insulate (conduction) – –Double pane windows, attic and wall Insulation – –Building materials Seal (convection) – –Caulk – –Weatherstrip Orient (radiation) – –Maximize winter solar gain – –Minimize summer solar gain

12. Windows Metal is a conductor, wood an insulator. – –Metal conducts heat away from your hands. Wood does not. – –The wood feels warmer than metal. Wood framed windows are better than metal.

13. Windows Cold air coming through cracks and gaps sinks and is warmed by the air in the room setting up a convection current.

14. Window Heat Loss About 10%-15% of a homes total energy is lost through windows Want to reduce loss through windows – –Install fewer windows – –Use multiple panes with an air space and low emittance coating to reflect infrared rays and a high solar gain coefficient to allow the sun’s heat in

15. Window Construction The window industry measures U-factor – –Measures the rate of heat transfer through the window – –Lower is better – –.35 is good Also solar heat gain coefficient – –Measures how well the window blocks heat from the sun – –Lower is better – –.32 is good Visible transmittance – –Measures how much light comes through the window – –Higher is better – –.51 is good Air leakage – –Measures air coming through the window – –Lower is better – –.2 is good

16. Insulation Types & R value: – –Fiberglass rolls3.14 – –Loose fill fiberglass2.2 – –Loose fill cellulose3.6 – –Extruded polystyrene5 – –Polyurethane6.25 – –Polyisocyanurate7.2 – –8” concrete block (whole)1.11 – –4” brick (whole).8 – –Plywood1.25 – –Drywall.9 – –Ashpalt shingles.44 – –Single pane window.91 – –Double pane window2.8 – –Triple pane window3.23 – –Air space1

17. Insulation How do you know if your insulation is working? – –Infrared camera – –Temperature gun

18. Preventing Air Leakage Caulk or foam all wall openings – –Plumbing, wiring, exhaust fans, etc. Caulk and weatherstrip windows and doors Caulk around recessed lighting and attic hatchway Caulk foundation, roof, and wall connections – –Maintain air exchange of 25%-35%

19. Air Leakage

21. Orientation Passive solar design – –Block summer sun but allow winter sun

22. West North East South

23. Green Materials Proven sustainability – –Clean manufacturing process – –High percentage of recycled content – –Ability to recycle at end of life – –Long product life cycle (lasts a long time) – –Made in sizes that produce less waste May come from design

24. Wall and Roof Color Dark exterior walls may help heat the home in winter but will make it harder to cool the home in summer Energy Star supports light colored roofs – –Reduce roof surface temp by 100ºF – –Lower cooling energy requirement by 15% Most homes have dark roofs – –Availability of materials – –We live in a heating dominated environment – –Some don’t understand the value of light colored roofs

25. Home Testing Home Energy Rating System (HERS) audit – –Score of 100 equals current energy code (2009 IECC) – –Score of 85 or lower qualifies as Energy Star Blower door testing can identify where air leaks are and determine overall home tightness

26. Payback We have to spend money in order to make our homes efficient Payback time compares the amount of money that we spend on materials to the amount of money that we save For example if we spend $2,000 on double pane windows and it saves us $100 a year it will be 20 years before we save as much money as we spent Must be considered against the budget Trade offs may be required

27. Web Sites www.state.ia.us/dnr/energy/MAIN/renewable www.BLM.gov/energy http://www.iccsafe.org/Pages/default.aspx www.doi.gov/greening/energy www.city.ames.ia.us/electricweb www.energy.iastate.edu www.eia.doe.gov www.fypower.org

28. Questions?