Good day, sunshine!
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Good day, sunshine!
Please get out your solar handout from last class!
Please read the board!
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Why fossil fuels?
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Why NOT Fossil Fuels?
What are the drawbacks of using fossil fuels?
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Sustainable energy sources
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4 types of Solar power
Photovoltaics Concentrated
tower systems Passive and
active heating systems
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Photovoltaics
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How does it work?
Photovoltaic cells contain a semiconductor material – creates a flow of electrons (electricity!) when hit by light.
Batteries store electricity for cloudy days or nights.
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Discovery Green down town
Two arrays totaling 256 solar panels
how much is it generating RIGHT NOW????
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Ikea on I-10
3,388 panels Completed June
2012
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Solar arc in Japan
5,000 solar panels
500,000kWh of electricity
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Solar panels are great for remote locations – free standing systems
Customers don’t need to be connected to the grid
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Our electric “grid” = power plants connected to consumers
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Solar update!
US solar industry – record growth in 2012, 16,ooo,ooo panels installed in nation, record 76% growth
Texas is in the top 10 states for solar installation and has the “most untapped potential” for solar (still just .1%of electricity)
Module costs have dropped 60% last two years
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OTHER KINDS OF SOLAR POWER
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Concentrated solar towers! 2007 near Seville
624 mirror, 35-story tower Heat turns water to steam for turbines Power for 6,000 homes
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Ivanpah Solar Electric Generating System – Mojave desert California 5.5 square miles Power for140,000
homes Molten salt stores
heat to be released on demand – even at night.
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How it works
Light bounces off mirrors and is concentrated at top of tower.
Molten salt is pumped to top of tower where light heats it up
Molten salt is used to turn water to steam turbine generator electricity!
Connected to existing electric grid.
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Mirrors track sun’s movement
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Passive solar – heats air or water; no electricity
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• In winter when sun is low in sky, light enters, bounces, turns into heat which is trapped by the super-insulated windows and walls.
• In summer, wide roof overhang blocks sunlight, keeping house cool.
• Windows face south and west.
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Hudson Passive Project NY
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Villa Nyberg, Sweden
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Passivhaus, Germany
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Fablab house, Madrid Spain
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Crossways, UK
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Vogel House, Switzerland
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Active systems
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Water piping on roof warms water. (New Hampshire)
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Active systems
Can also be used to heat a house with radiators.
Water pipes on roof heat up.
Water brought down into heat exchanger in house which warms the shower water.
Cooled water pumped back to roof to warm up.
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Active system
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4th period homework
Tomorrow: building solar pizza box ovens!
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5th/6th period homework
Three questions for Mr. Morton of Texas Solar Outfitters.
Listen for the answers during tomorrow’s talk. Questions and answers turned in at the end of the period tomorrow for a grade.
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Solar giants
Germany! - requires solar installation on new buildings; gave tax rebates for homes installing photovoltaics.
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So what are the trade offs?
Benefits Disadvantages