Solar Energy Primer_15nov10

Solar Energy Primer_15nov10 - JSK2008 Solar Energy Primer...

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Unformatted text preview: JSK2008 Solar Energy Primer The Earths surface receives about 89 petawatts (89x10 15 W) of solar radiation (insolation) 100 mW/cm 2 AirMass1.5 conditions In one year, the total solar energy absorbed by Earth's atmosphere, oceans and land is approximately 3,850 zettajoules (10 21 J) More solar energy strikes the earth in 1 hr (4.3x10 20 J) than all the energy consumed on the planet in 1 yr (4.1x10 20 J in 2001) The world energy consumption rate was 13.5 terawatts (10 12 W) in 2001, and is expected to grow to 27 TW by 2050. The US consumption of total power (gas, electricity) was 3.34 TW in 2005. The US electricity consumption was about 0.7 TW (winter 2006- 2007) A half day of sunlight (in winter) striking the US (9x10 15 watts) can provide all the US energy for a year (29,000 TW-hr). 1 Solar Energy Primer Solar irradiance spectrum above atmosphere and at surface 2 JSK2008 Solar Energy Primer A newly established low band gap for indium nitride means that the indium gallium nitride system of alloys (In 1-x Ga x N) covers the full solar spectrum....
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Solar Energy Primer_15nov10 - JSK2008 Solar Energy Primer...

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