Solar Thermal Heating For Schools

Affordable Solar Thermal Energy
for Schools

American Solar, Inc.

05/15/09

• 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

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


Energy Uses
in Schools
75°F

Space heating
and water
heating require 120°F
the most energy
in schools


So How Can Schools Meet
Their Largest Energy Need?


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.


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


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.


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


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


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


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


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


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


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


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


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

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


Solar Thermal Heating For Schools

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