Photothermal utilization
Its basic principle is to collect solar radiant energy and convert it into heat energy through the interaction with matter. At present, the most used solar energy collection devices are mainly four types of flat type collectors, vacuum tube collectors, ceramic solar collectors and focusing collectors. Solar thermal utilization is generally classified into low temperature utilization (<200 ° C), medium temperature utilization (200 to 800 ° C), and high temperature utilization (>800 ° C) depending on the temperature and use that can be achieved. At present, low-temperature utilization mainly includes solar water heaters, solar dryers, solar distillers, solar houses, solar greenhouses, solar air-conditioning refrigeration systems, etc. The medium-temperature utilization mainly includes solar cookers, solar thermal power generation concentrating collectors, etc. Solar furnace and so on.
solar energy generation
Clearing up new energy The future use of solar energy is used to generate electricity. There are many ways to use solar power to generate electricity. There are two main types that have been put into practical use.
1 light - heat - electricity conversion. That is, using the thermal energy generated by solar radiation to generate electricity. Generally, a solar collector is used to convert the absorbed heat energy into steam of the working medium, and then the steam driven gas turbine drives the generator to generate electricity. The former process is light-to-heat conversion, and the latter process is heat-to-electric conversion.
2 light-to-electricity conversion. The basic principle is to use the photovoltaic effect to convert solar radiant energy directly into electrical energy. Its basic device is a solar cell.
Photochemical utilization
This is a photo-chemical conversion method that uses solar radiation to directly decompose water to produce hydrogen. It includes photosynthesis, photoelectrochemistry, photochemical action, and photolysis.
Photochemical conversion is a process of converting into chemical energy by absorbing light radiation to cause a chemical reaction. The basic forms are photosynthesis of plants and the use of chemical changes in the storage of solar energy photochemical reactions.
Plants rely on chlorophyll to convert light energy into chemical energy, to achieve their own growth and reproduction. If you can reveal the mystery of photochemical conversion, artificial chlorophyll power generation can be realized. At present, solar photochemical conversion is actively exploring and researching.
Photobioutilization
The process of converting solar energy into biomass is achieved through photosynthesis of plants. At present, there are mainly fast-growing plants (such as firewood forests), oil crops and giant seaweeds.
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