Solar Energy And The Atmosphere Ppt

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.

Solar energy and the atmosphere ppt.

Non conventional sources of energy are solar energy wind energy biomass energy ocean energy. 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. Burning of fossil fuels release a large amount of carbon dioxide gas which increases the temperature of the atmosphere and causes global warming green house effect. Solar energy is free and its supplies are unlimited.

Solar energy has great potential for the future. It is an essential source of renewable energy and its technologies are broadly characterized as either passive solar or active solar depending. Only about 7 of solar radiation is in the uv wavelengths. 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 second highest energy is also mostly stopped in the atmosphere. The three types are. Because the intensity of solar radiation at earth s surface is so low these collectors must be large in area. 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.

Solar constant isc solar constant isc. Of the solar energy that reaches the outer atmosphere uv wavelengths have the greatest energy. Of the remaining solar energy about 19 percent is absorbed by the atmosphere and clouds and about 51 percent is absorbed. It does not pollute or otherwise damage the environment.

Energy released from the sun is emitted as shortwave light and ultraviolet energy. Chapter 2 solar energy seasons and the atmosphere our solar system figure 2 1 earth s orbit perihelion closest to sun january 3 91 500 000 mi aphelion farthest at july 4 94 500 000 mi earth s energy budget figure 2 8 the electromagnetic spectrum sun radiates mostly shortwave some longwave energy earth radiates longwave energy solar and terrestrial energy figure 2 7 solar. Even in sunny parts of the world s temperate regions for instance a collector must have a surface. Sources of energy 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. 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.