Question
Download Solution PDFIn what form is solar energy is radiated from the sun?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Solar radiation:
Solar radiation is radiant energy emitted by the sun from a nuclear fusion reaction that creates electromagnetic energy. The spectrum of solar radiation is close to that of a black body with a temperature of about 5800 K. About half of the radiation is in the visible short-wave part of the electromagnetic spectrum. The other half is mostly in the near-infrared part, with some in the ultraviolet part of the spectrum.
- The units of measure are Watts per square meter.
- solar radiation has an intensity of approximately 1380 watts per square meter (W/m2). This value is known as the Solar Constant.
- At our latitude, the value at the surface is approximately 1000 W/m2 (1 kW/m2) on a clear day at solar noon in the summer months.
- The difference between this value and the Solar Constant is due to transmission loss to the atmosphere. The clear sky value is considerably less in the winter. Clouds can dramatically reduce this value by reflecting the solar radiation back out to space.
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