Solar Energy

Solar Energy

Solar Energy Oak Park High School Idea To Impact 2014 Alexis Cheney Dorinda Fong Kristen Bender Rachel Convey Laura Cruz- Which types of energy does the sun give us? Forms of Energy A quick review Thermal (heat) Electromagnetic

(light) Chemical (body functions) Other forms of energy include: Electrical Electrochemical Sound Potential Kinetic What Is Renewable Solar Energy? Solar energy-energy from the sun

Comes in the form of thermal (heat) and electromagnetic (light) energy Obtainable directly from the sun or indirectly from moving water, wind, and biomass Solar Energy Types and Uses TYPES Photovoltaic (PV) Crystalline Thin Film BIPV Roof Shingles Concentrated Solar Cookers

Mirror Utilities Systems Active Closed Loop Open Loop Passive ICS Thermosyphon USES Commercial, industrial or residential Transportation: cars, boats, planes Satellites Cool projects!

Crystalli ne Thin Film BIPV Solar Cookers Heliostats and Parabolic Trough Systems Solar Energy Closed Loop Thermosyphon Solar Heating Heating Water

Solar Heating Passive and Active Active solar heating system: absorbs energy from sun by pumping heat-absorbing fluid (water or anti-freeze) through special collectors Can be used to heat water Passive solar heating system: absorbs and stores heat directly from sun without pumps or fans

Ex: concrete, adobe, brick, stone store solar energy as heat then release it slowly during the day and night Solar Heating Advantages & Disadvantages PROS CONS

Free energy No CO2 emissions Quick installation Net energy Average active High passive Moderate cost Requires sun more than half the time Need heat storage system Maintenance & repair Unattractive asthetics

Solar Thermal Energy Central Receiver Systems: Power Tower & Heliostats Solar Thermal Energy Central Receiver Systems: Power Tower & Heliostats Heliostats (mirrors or reflectors) direct sunlight to receiver on collector tower Heat transfer fluid is pumped up the tower and heated by focused

solar energy High pressure steam turns turbine, generating electricity Solar Thermal Energy Solar Thermal Plant/Parabolic Trough Solar Thermal Energy Solar Thermal Plant/Parabolic Trough Note the differenc

e between heliostats & parabolic troughs reflectors) Sunlight hits the receiver (parabolic mirrors or Receivers direct the sunlight to receiver tube, which is filled with heat transfer fluid and is located at focal line of parabola Hot fluid transfers heat to water in heat exchanger The steam powers the turbine, generating electricity Solar Thermal Energy Advantages & Disadvantages PROS CONS

No CO2 emissions Quick construction Moderate environmental impact and net energy Reduced costs of turbine back-up

Low efficiency High cost Needs back-up system Requires large land plots May impact desert environment Solar Thermal Energy Solar Cooking! Utilizes Solar thermal energy cookers can reach 250F to 425F Anything

that is normally cooked in an oven can be put in a solar cooker Becoming You can build a solar cooker! popular and useful around the world Cook meals Sanitize medical devices

Clean and heat water No electricity required No pollution Solar Panels Parts of a PV System Photovoltaic Cellsemiconductor material generates voltage and current Module-cells wired together Array-One or more modules with hardware

Charge Controller-equipment regulates battery voltage Battery Storage-stores DC electrical energy Inverter-converts DC to AC to operate loads that require AC DC Loads-appliances, motors and equipment powered by direct current AC Loads-appliances, motors and equipment powered by alternating current Solar Panels Photovoltaic (PV) Solar System Focus PV systems transform the energy of light particles (photons) from the sun into electricity.

PV cells are made of silicon wafers which absorb the photons that hit it Cells are connected to make modules and arrays It can collect energy and Energy store it as electricity for cannot be later created or destroyed but it can be changed

into different forms. Solar Panels Technological Advances Increase efficiency- silicon Lower production costs Nanoparticles/Nano flakes Organic solar cells Solar films not from silicon Liquid solar array Solar Panels

Advantages & Disadvantages PROS CONS No CO2 emissions High net energy Quick installation Easy to move or expand Work in inclement weather Small environmental impact Last several decades

Low efficiency levels Need back-up Solar cell power plants take up large land plots Expensive DC convert to AC

Energy Usage in the United States Only 8% is renewable! Energy Usage in the United States More recent data Used the most: Natural Gas Used the least: Renewable energy which includes solar energy! Why is solar limited? People & Government Consumers: expensive pricing deters

buyers from long term benefits Economic perspective: unequal subsidies, overpricing Government: slowly willing to support in recent years, focus on broad concepts of clean energy and reducing funding to fossil fuel companies Resources: land, purifying elements is expensive Recent Events Renewable Energy Successes 2012 Doubled nations supply of renewable energy (43 gigawatts in 2009, 87 gigawatts in 2012) Allowed development of clean energy on public land to power 3 million homes (worth 13,000 megawatts) 2013

Spin Cell concept released, conical shape, tracking systems not needed 2014 State of Union Address: Obama promoted clean energy and reducing carbon pollution Go SEEK! Solar Energy Eco Knowledge Thank you for learning with us!

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