Solar Energy – pages 453 and 454 and
http://www.eere.energy.gov/solar/
Solar Heating systems – ____________ and ___________
_________ system - uses an architectural design which enhances
the absorption of solar energy without mechanical power
- is used to reduce heating costs but must have a backup
system.
- uses roof overhangs to shade windows in the summer, and
- uses building materials that absorb heat energy
_________ system - requires mechanical energy through ________
and _____ to move air or water carrying heat to areas where heat is
stored.
- Energy is collected in a ___________ __________ __________
- They have been used in to heat homes but also solar
_______heaters, solar ________ heaters, and space heating
systems.
Photovoltaic Cells - A device made of _________ cells which
changes sunlight directly to_______ through the release of
electrons. This is active system.
- world’s fastest growing source of electricity - expanding
globally with some large scale plants and store excess
electricity by running pumps to create _____________
underground
- many uses (_______________________________
_____________________________________
_____________________________________.)
- it is being used more often on homes, building and many
other small scale operations.
CSP (________________
____________) – uses various systems to collect solar energy.
This also an active system
- converts the sun’s energy into ____________ which is then
used to generate ____________.
- there are three types of CSP technologies: __________,
________________, ____________
Solar Lighting
- __________________ collectors focus sunlit into a ________
________ system to illuminate buildings
- _________solar lighting combines collected light and is
adjusted by sensors. Known as hybrid lighting. Limited by
distance and weather.
Impacts of solar Energy
Pros
- No air pollution
- inexhaustible supply
- technologies are improving (especially photovoltaics)
- effective on a small scale
Cons
- lack of consistent sunlight in most areas
- Requires large areas to produce a lot of energy
- still too expensive to compete with fossil fuels in most cases but
photovoltaic prices are dropping
- difficult to store
Solar Energy – pages 453 and 454 and
http://www.eere.energy.gov/solar/
Solar Heating systems – Active and Passive
Passive system - uses an architectural design which enhances the
absorption of solar energy without mechanical power
- is used to reduce heating costs but must have a backup
system.
- uses roof overhangs to shade windows in the summer, and
- uses building materials that absorb heat energy
Active system - requires mechanical energy through pumps and
fans to move air or water carrying heat to areas where heat is
stored.
- Energy is collected in a flat plate collector
- They have been used to heat homes, but also solar
water heaters, solar pool heaters, and space heating systems.
Photovoltaic Cells - A device made of silicon cells which changes
sunlight directly to electricity through the release of electrons.
Considered an active system
- world’s fastest growing source of electricity - expanding
globally with some large scale plants and store excess
electricity by running pumps to create pressurized air
underground
- many uses (calculators, wristwatches, appliances,
satellites, space shuttles, and some road signs, and solar
lighting.) In some case like light a battery is charges during the
day.
- it is being used more often on homes, building and many
other small scale operations
CSP (concentrating solar power) – uses various systems to
collect solar energy. This is done at a large scale (power plant
level). Also considered an active system.
- converts the sun’s energy into heat which is then used to
generate steam to make electricity - power plants.
- there are three types of CSP technologies:
dish/engine, trough, power tower
Hybrid Solar lighting
http://www.explainthatstuff.com/hybrid-solar-lighting.html
- parabolic collectors focus sunlit into a fiber optic
system to illuminate buildings
- hybrid solar lighting combines collected light and is adjusted
by sensors
- limited by distance and the weather
Impacts of solar Energy
Pros
- No air pollution
- inexhaustible supply
- technologies are improving (especially photovoltaics)
- effective on a small scale
Cons
- lack of consistent sunlight in most areas
- Requires large areas to produce a lot of energy
- still too expensive to compete with fossil fuels in most cases but
photovoltaic prices are dropping
- difficult to store