Solar Energy And The Atmosphere Ppt

The three types are.

Solar energy and the atmosphere ppt.

Total energy received from the sun per unit time on a surface of unit area kept perpendicular to the radiation in space just outside the earth s atmosphere when the earth is at its mean distance from the sun. It cannot be controlled by any one nation or industry if wecan improve the technology to harness the sun s enormous power wemaynever face energy shortages again. Sources of energy ppt. It does not pollute or otherwise damage the environment.

Solar energy has great potential for the future. When it reaches the earth some is reflected back to space by clouds some is absorbed by the atmosphere and some is absorbed at the earth. It is an essential source of renewable energy and its technologies are broadly characterized as either passive solar or active solar depending. Solar energy is radiant light and heat from the sun that is harnessed using a range of ever evolving technologies such as solar heating photovoltaics solar thermal energy solar architecture molten salt power plants and artificial photosynthesis.

Because the intensity of solar radiation at earth s surface is so low these collectors must be large in area. Non conventional sources of energy are solar energy wind energy biomass energy ocean energy. The earth atmosphere energy balance is the balance between incoming energy from the sun and outgoing energy from the earth. Only about 7 of solar radiation is in the uv wavelengths.

Of the remaining solar energy about 19 percent is absorbed by the atmosphere and clouds and about 51 percent is absorbed. Figure 2 16 on the average of all the solar energy that reaches earth s atmosphere annually about 30 percent 30 100 is reflected and scattered back to space giving earth and its atmosphere an albedo of 30 percent. The highest energy ultraviolet does not reach the planet s surface at all. Solar constant isc solar constant isc.

Solar energy is free and its supplies are unlimited. Among the most common devices used to capture solar energy and convert it to thermal energy are flat plate collectors which are used for solar heating applications. A standard value of solar constant is 1353 τ𝑊 𝑚2. Of the solar energy that reaches the outer atmosphere uv wavelengths have the greatest energy.

Even in sunny parts of the world s temperate regions for instance a collector must have a surface. The second highest energy is also mostly stopped in the atmosphere.