Definition of solar energy
Solar energy is defined as the energy resulting from converting sunlight into electricity through the use of photovoltaic solar cells. It is one of the most important renewable energy sources, and the fastest growing among them. As it promises a promising future in providing energy for various uses. Every site on Earth receives a quantity of sunlight throughout the year, but the amount of solar radiation that one spot receives varies from one place to another on the surface of the Earth, and that amount is called solar radiation, which is also known as photoelectric radiation. Where it is emitted from the sun in the form of light that solar energy technologies capture, and convert it into useful forms of energy.
when solar panels are exposed to sunlight, these cells absorb energy from sunlight, and this energy generates electric charges that move in response to an electric field internal in the cells which leads to the flow of electricity. This system consists of solar cells made of semiconductor materials, and when these materials are exposed to sunlight, the solar energy stimulates the electrons in the atoms of these The process of converting sunlight (photons) into electricity (voltage) is called the photoelectric effect. Concentrated solar energy systems: Solar energy systems depend on the use of mirrors and lenses to focus a large amount of sunlight on a small area, then the solar energy is converted into heat, and the concentrated solar energy system consists of 3 main units.
Solar field: The solar field converts solar energy into thermal energy.
Heat tank: It stores thermal energy by using molten salt as a heat storage medium.
Energy production unit: Electricity is generated in this unit using steam turbines that operate on steam generated from solar energy.
Solar heating systems Solar heating systems technologies use thermal energy from the sun to provide hot water and heating for residential, commercial and industrial facilities. These systems provide an alternative to using electricity or natural gas. These systems consist of three main elements: the main collector, insulated pipes, And a hot water tank, and these systems can include optional tools, such as: electronic control units, and a freezing protection system when needed, especially in areas with cold climates.These systems provide adequate internal temperature in two ways:
– Active solar heating method: the appropriate heat is provided in this way by circulating hot water or gas by means of a pump or fan.
– Passive solar heating method: This method allows heat to circulate inside buildings in a natural way without the use of external energy