Solar Basic

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Solar Energy by B.Kondalarao

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• Diameter: 1.39E9 m (120 x greater than earth) • Distance from earth = 1.495E11 m (93 million miles) ± 1.7% • Powered by hydrogen fusion • Effective blackbody temperature of 5777 K Solar energy is the utilization of the radiant energy from the Sun.

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• Solar energy can be used for electrical production – Photovoltaic – Trough collectors – Power towers Direct Use of Solar Energy • What is the best use for solar energy? – Transportation – Electrical energy production – Space and water heating

Photoelectric effect : 

Photoelectric effect • Electromagnetic radiation can be viewed as photons – Each photon has energy E = h ν = h c / λ – Photons travel at speed c = λ ν • Photons having an sufficient energy can dislodge an electron from silicon (1.12 eV=1.794e-22 kJ) • The electron is accelerated by the electric field • If a circuit is provided a current will flow

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+ + + + + + + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - - - - - - - - - - - Load e- Solar radiation

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• Located in the Mojave desert in southern California • Ambient Temperatures Range from –10°C to 46°C • Average 340 Days of Sunshine Kramer Junction, CA

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View of 530MW plants at Kramer junction, CA

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Parabolic Trough Collectors

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Solar Power Towers

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Solar Power Towers

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ADVANTAGES:- Maintenance is easy. No pollution. Renewable energy. DISADVANTAGES:- • A significant fraction is reflected or absorbed by our atmosphere • Most of the energy falls on inaccessible Locations sun light available only in the day time. • Solar energy is diffuse so equipment to collect it is large and expensive.

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Thank you