Solar Energy - Alternative Energy Engineering - Lecture Slides, Slides of Environmental Law and Policy

Download Solar Energy - Alternative Energy Engineering - Lecture Slides and more Slides Environmental Law and Policy in PDF only on Docsity! Solar Power II March 10, 2009 ME 496ALT – Alternative Energy 1 Solar Energy II Larry Caretto Mechanical Engineering 496ALT Alternative Energy March 10, 2009 2 Outline • Review last week • Concentrating solar power • Passive solar • Photovoltaics 3 4 Optimum Fixed Collector Tilt 5 Solar Irradiation by Month in Los Angeles (LAX) Average of Monthly 1961-1990 NREL Data for different collectors 0 1 2 3 4 5 6 7 8 9 10 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Month Irr ad ia tio n (k W h/ m2 /d ay ) Fixed, tilt=0 Fixed, tilt=L-15 Fixed, tilt=L Fixed,tilt=L+15 Fixed,tilt=90 1-axis,track,EW horizontal 1-axis,track,NS horizontal 1-axis,track,tilt=L 1axis,tilt=L+15 2-axis,track Notes: All fixed collectors are facing south The L in tilt = L means the local latitude (33.93oN) 6 Solar Power II March 10, 2009 ME 496ALT – Alternative Energy 2 7 8 9 Concentrating Solar Power • Concentrate solar beam to produce high temperature heat – Parabolic trough systems: long, U-shaped mirrors concentrate heat on oil line at focal point; heated oil used to generate steam – Dish-engine systems: like satellite antenna, concentrate solar power on external combustion engine at focus – Power tower receives solar energy from a series of mirrors to heat molten salts 10 Concentrating Solar Power II • Typically use “hybrid” systems that combine solar and fossil fuel heat sources • Heated materials (oil or molten salts) can be stored for heat generation later in day • Most applications for electric power production 11 http://www.energylan.sandia.gov/photo/photos/3081/308154d.jpg 12 Parabolic Troughs • http://www1.eere.energy.gov/solar/linear_concentrators.html Solar Power II March 10, 2009 ME 496ALT – Alternative Energy 5 25 26 27 28 29 30 Solar Power II March 10, 2009 ME 496ALT – Alternative Energy 6 31 32 33 34 35 36 Solar Power II March 10, 2009 ME 496ALT – Alternative Energy 7 37 38 39 40 41 42