Solar Panels made from photovoltaic cells ( PV). Simply broken-down photo means light and voltaic related to the production of electricity. Solar Photovoltaic (PV) technology enables the creation of electricity using light intensity. PV cells have at least two layers of semiconductors, one that's positively charged, and one is negatively charged. When the light shines on the semiconductor material the electric field across the junction between these two layers causes electric current to flow.
Solar energy is a good alternative to replace fossil fuel as the major energy source because solar power is renewable at absolutely no cost to supply energy infinitely. The world pollution is getting worse. Any effort that can reduce the pollution to the environment helps to save the earth. Solar panels can harness the energy from the sun and convert it to electricity. Therefore, the use of solar panels is environment friendly.
This beam collects Solar Energy and converts it into Electrical Energy. This concept is more advantageous than conventional methods. The SPS will be a central attraction of space and energy technology in coming decades. It is not a pollutant but more aptly, a man made extension of the naturally generated electromagnetic spectrum that provides
The Sun provide Earth with large amount of energy enough to power the great oceanic and atmospheric currents, the cycle of evaporation and condensation that bring fresh water in land and drives water flow, and the typhoon, hurricanes, and tornadoes that so easily destroy the natural and built landscape. Sunlight can be converted into electricity by exciting electrons in a solar cell. It can yield chemical fuel via natural photosynthesis in green plants or artificial photosynthesis in human engineered system. Concentrated or unconcentrated sunlight can produce heat for direct use or further conversion to electricity. Figure 1.1 shows the solar photons convert naturally into three forms of energy which are electricity, chemical fuel and heat.
Crystalline silicon is well known as solar grade silicon it is the most prevalent bulk material for solar cell. The bulk silicon is separated into multiple categories according to crystallinity and crystal size in the resulting ingot, ribbon or wafer. The concept of a p-n junction is entirely based on the cells. C-Si made of solar cells are made from wafers between 160 and 240 micrometers chunky, which make the first generation cell has high sustainable and it can demonstrate to collect the sun’s light very often. The commercially predominant PV technology, which includes materials such as polysilicon and monocrystalline silicon.
The Sun’s energy which radiates into the Earth’s surface and harnessed by solar cells are composed of broad spectrum of electro-magnetic (EM) waves combined together which form visible light that have different power densities depending on the wavelength of propagation. The particular region of operation for crystalline silicon solar cell is the visible spectrum. Particle nature of light Light consists of energy carrying quantum-mechanical particles called photon. The energy of photon is directly proportional to the frequency of propagation. Energy of photons can be calculated using the equation E = hc/ λ or E(eV) = 1.24 / λ(μm) which give results in electron volts.
1.1 Wind Energy System Wind is air in motion, it is due to uneven heating of earth surface by the sun rays. Since the earth surface consists of different types of land the water, it absorbs the sun heat at different rates. Wind energy is mainly used to generate electricity like earlier wind mills modern wind machines used blades to collect the winds Kinetic energy. 1.1.1 Advantages 1) The blades ere connect to shaft that turn on an electric generator to produce electricity. 2) Use of wind power to produce electricity on commercial scale has become the fastest growing energy technology.
The concentrating solar power plants are converting the sun’ energy into the high temperature heat. The other part of the concentrating solar power is converting the solar energy into heat while the other part converts the solar energy into electricity. The concentrating solar power plants with the large scale are used in concentrating the sunlight by reflection which is opposed to the sunlight refraction. The concentrating solar power is ranging from small kW to the hundreds of MW.The first concentrating solar power was used in California. Most of the concentrating solar power which was installed is
According to (Wikipedia.org 2014) the sun is the most important source of renewable energy available at this time. The sun provides energy for all living creatures on earth. For example, plants absorbs solar radiation from sunlight and converts it into stored energy for growth and development. This process is called photosynthesis.Solar energy is a light and heat from the sunlight collected and converted using a wide variety of technologies such as artificial photosynthesis, solar thermal electricity, solar architecture, solar heating device and solar photovoltaics. Scientists and engineers today works extremely hard to develop ways to utilize solar radiation or sunlight directly by converting it into useful heat or electricity.
Here, is it discussed about the off grid wind solar hybrid power system and how and why it can be taken into account in Sri Lanka is discussed in a nutshell at the latter part. Producing electricity using solar energy and wind energy? Solar energy: Solar energy is free and also it is the prime source of all the other energy sources and is unlimited. The heat generated by the Nuclear Fission on the sun is radiated onto the earth. This radiation carries a lot of energy which Tis about 10,000 times the energy