Solar Thermal Heating For Schools

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How to deploy cost-effective solar thermal projects in k-6 schools.

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Solar Thermal Heating For Schools

  1. 1. Affordable Solar Thermal Energy for Schools American Solar, Inc. 05/15/09
  2. 2. • The basic question is not where can we get more energy, rather you should ask…. • What do we want energy for? • What are the end-uses we are trying to provide, such as comfort and light…? • How much energy…from what source will meet…end-use needs in the cheapest way?” © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  3. 3. The Largest Energy Need in U.S. is HEATING ENERGY USES IN RESIDENTIAL, COMMERCIAL, AND INDUSTRIAL BUILDINGS NON-HEATING LOADS Lighting Space Heating Cooling / Refrig 75°F Equipment Water Heating Others 120°F Clothes Drying Process Heat 140°F Boilers 90+°F HEATING LOADS Portions of all energy used in buildings and facilities, Source data: US Energy Information Administration © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  4. 4. Energy Uses in Schools 75°F Space heating and water heating require 120°F the most energy in schools © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  5. 5. So How Can Schools Meet Their Largest Energy Need? © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  6. 6. Solar Heating Solutions • Solar power to generate electricity • Solar heat to heat water or air • Solar heat to pre-heat boilers, heat pumps, AC reheat, etc. © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  7. 7. Technologies to Deliver Solar Heat • Solar panels – Basically appliances fastened on, in, or thru the roof – Electric Photovoltaic (PV) for electric heat – Thermal water – Thermal air • Built in to wall or roof – Conventional or specialized metal roofing or siding © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  8. 8. Basic types of solar roofing • Solar electric systems (PV)- – most expensive, least productive, least economical, holes in the roof • Solar water heating, – Less expensive, more productive, marginal economics, complicated plumbing, risk of freeze damage and leaks, holes in the roof • Solar air heating systems – Least expensive, productive, pays for re-roof in few years, least complicated, built as conventional, weather tight metal roofs, with no holes. – Simply pull heated air off the backside of a hot conventional metal roofing panel – Deliver heated air to the building for many uses, • heat air, heat water, heat equipment, etc. © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  9. 9. A Solar Heating Solution with Metal Roofing • Can use the building’s entire roof • Integrates with the building’s structure • Reduces roofing and re-roofing costs • Reduces energy use © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  10. 10. Metal Solar Roof Heat Recovery New, Replacement, or Existing • Low Slope (flat) and steep slope roofs preheat ventilation air by pulling air below metal roof panels • Conventional metal roof is a solar air heater • Install in new construction or replace an old, worn out roof • Varied colors and styles • Longer life than traditional roof materials – Typical Roof Life • Spray Foam = 12 years ; Asphalt Shingles = 15-25 years • Membrane & Built Up Roof = 17 years • Metal = 40 years © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  11. 11. Re-Roofing Worn Out Roofs • Re-Roofing often the largest single building maintenance expense • Metal re-roofs have lowest life cycle cost, but higher first cost • Metal re-roofs, built for solar heat recovery, can be lower first cost from tax & energy savings …. • Can be cash positive on day 1, with financing option. Solar re-roofing is the only re-roof that pays for the roof from energy & tax savings © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  12. 12. Solar Metal Re-roofing Projects • Solar metal re-roof over central portions of roof • Conventional metal panel roof retrofit over membrane • Vents and fans carried up through new roof or replace vents with shorter vents to fewer fans • Recover solar heated air from below metal roof for uses in varied uses in the building © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  13. 13. Re-Roofing Costs Compared Roof Type Installed Tax savings 5 Year Re-roof, 10 year cost per per sqft, incl Energy years savings /cost sqft depreciation savings Solar Metal $12 $6.50, in 6 $5-20 40 +$5-10 saved Air Heating years Roof pays for itself + Metal $10 $2.50, in 20 -39 -0- 40 -$9 expense years Membrane $7 $1.75, in 15 -0- 17 -$6 expense years Spray Foam $5 $1.25 in 10 -0- 15, recoat in -$6 expense years 5 & 10 Asphalt $4 $1.00 in 5 -0- 15 -$3 expense Shingle years 2007 © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  14. 14. Tax and energy savings for solar roofing • Tax savings- Federal tax law allows commercial owners of solar energy systems to – Deduct 30% of cost of system (roof), in first year, and… – Depreciate solar system in 6 years, vs 20-39 for normal roof. – Suitable for Public Private partnerships • Energy savings- Solar air heating systems generate ~$1- 4 dollars of energy savings per year for every square foot of surface. • Roofing savings- Metal roofs are best lifecycle cost to owner, -- now even better with solar air heat recovery © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  15. 15. Financing Options For Schools Purchasing Solar Roofs • Bond Financing – Purchase • Leasing – Purchase Arrangements • Energy Savings Performance Contracts • Solar Energy Investment Trust (SEIT) – Private ownership of solar energy system © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  16. 16. Buy the heat not the hardware! • No capital expense for owner • New roof may be included with solar re-roof • No maintenance for owner, – Contractor owns, maintains, and delivers heat – Contractor charges for heat and “roofing service” – Solar contractor takes the tax credits, – Contractor uses credits to lower costs to building owner • Credits can lower unit energy costs by 40% • Credits expire 2016 © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  17. 17. Solar energy looks better and does more than ever before! • New aesthetics - shapes & colors • New building integrated roofs & siding • New high performance, low cost air collectors • New solar applications • Tax breaks & financing for commercial & government users •Lowest cost roof •Lowest cost solar •Lowest cost energy © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com
  18. 18. Get Information on Solar Heating For Your Schools Visit our web site: http://www.americansolar.com/markets/schools.htm American Solar Inc ….simply heating air © American Solar, Inc. 2009 (703) 425-0923 www.americansolar.com

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