Solar energy, generally refers to the radiant energy of sunlight, solar energy is a renewable source of energy, the broad sense of solar energy is the Earth's sources of many energies, such as wind energy, biomass energy, tidal energy, the potential energy of water and so on. The basic methods of solar energy utilization can be divided into four categories: light-heat utilization, light-electric utilization, light-chemical utilization, light-biological utilization. In the four types of solar energy utilization, light-heat conversion technology is the most mature, the most products, the cost is relatively low. Such as: Solar water heaters, water dryers, dryers, solar stoves, solar greenhouses, solar rooms, solar desalination devices, as well as solar heating and chillers. Solar photothermal power generation is more efficient than solar energy conversion in photovoltaic power generation, but it is not widely used.
In Photothermal conversion, the application of solar water heater is the most widely used, the most mature technology and the best economy. Photothermal utilization: It is the collection of solar radiant energy, which is used by converting it into heat energy through interaction with matter. At present, the most used solar collector, mainly flat type collector, vacuum tube collector and focus collector, such as 3 kinds. Solar power: The future large-scale use of solar energy is used to generate electricity.
There are two main ways to use solar power to generate electricity: ① light-thermal-electrical conversion. That is, the use of solar radiation generated by thermal power generation. It is generally used by solar collectors to convert the absorbed heat energy into working steam, and then steam driven gas turbines drive the generator to generate electricity.
The previous process is light-heat conversion, and the latter process is thermal-electrical conversion. ② Optical-Electrical conversion.
The basic principle is that the solar radiant energy should be converted directly into electrical energy by using the photovoltaic effect, and its base device is the solar cell.
Photochemical utilization: This is a light-chemical conversion method that uses solar radiant energy to decompose water directly into hydrogen production. Optical bioavailability: The process of converting solar energy into biomass through photosynthesis of plants. There are mainly fast growing plants (such as fuelwood forests), oil crops and giant seaweed.