Solar Energy.

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Presentation transcript:

Solar Energy

The Sun Mass ~ 2 x 1030 kg Diameter ~ 1 390 000 km Surface temp ~ 6000 C Power output ~ 3.8 x1026 W

How much of this power is available to us? Distance from Earth-Sun = 1.5 x 1011 m. Power received = Power of Sun 4πd2 This is a maximum power per square metre and although the atmosphere and Earth’s tilt diminishes some of this, there is still loads available.

Solar Cells Sometimes “photocells.” Made from Silicon Light energy absorbed Electrons freed from Silicon crystals Direct current

Pros and cons Pros Little maintenance except for keeping surface clean Remote locations Renewable source Strong, zero emissions. Cons Not terribly efficient Variable output according to season, latitude and cloud cover plus if dark… power = 0.

Solar cells are designed to work over quite a narrow band of wavelengths

Solar heating Curved shape means that maximum amount of heat energy reaches the pan! Sizzlin’!

Passive solar heating can warm water and lower energy bills