What are the clean energy sources?
Release time:
2019-01-05
With the start of the "Blue Sky Defense War", more and more people are paying more and more attention to energy consumption and environmental pollution. Clean energy, that is, green energy, refers to energy that does not emit pollutants and can be directly used in production and life. , In today's world, the development of energy, energy and environment are issues of common concern to the whole world and all mankind. So what are the clean energy sources?
solar energy
Solar energy is both a primary energy source and a renewable energy source. It is rich in resources, free to use, does not require transportation, and does not cause any pollution to the environment. However, solar energy also has two main disadvantages: first, the energy flow density is low; second, its intensity cannot be maintained constant due to various factors (season, location, climate, etc.). These two major shortcomings greatly limit the effective utilization of solar energy.
Utilization technology: photothermal conversion - solar water heater, photoelectric conversion - solar photovoltaic cells, photochemical conversion - photosynthesis.
Geothermal Energy
Geothermal energy is renewable thermal energy from deep in the earth. It originates from the earth's molten magma and the decay of radioactive materials. Its utilization can be divided into two categories: geothermal power generation and direct utilization. Geothermal energy is renewable if the rate of heat extraction does not exceed the rate of replenishment. However, the distribution of geothermal energy is relatively scattered and difficult to develop.
Utilization technologies: direct combustion, thermochemical conversion, biochemical conversion.
wind energy
Wind energy is a non-polluting renewable energy with huge development potential, especially for coastal islands, remote mountainous areas with inconvenient transportation, vast and sparsely populated grassland pastures, as well as rural areas and frontiers that are far away from the power grid and will be difficult to reach in the near future. As a reliable way to solve the problem of production and living energy, it is of great significance. Even in developed countries, efficient and clean wind energy is receiving increasing attention.
Utilized technologies: water lifting, wind power generation, sails to aid navigation, and use of wind energy for heating.
Ocean Energy
Ocean energy refers to renewable energy attached to seawater. The ocean receives, stores and dissipates energy through various physical processes. This energy exists in the ocean in the form of tides, waves, temperature differences, salinity gradients, ocean currents, etc.
Utilization technologies: tidal power generation, wave power generation, seawater temperature difference power generation, salinity difference power generation, ocean current power generation.
Bioenergy
Biomass refers to various organisms produced by photosynthesis. Bioenergy is an energy form in which solar energy is stored in organisms in the form of chemical energy. It is a kind of energy with biomass as a carrier. It originates directly or indirectly from plants. of photosynthesis. Among various renewable energy sources, biomass is unique in that it is stored solar energy and is the only renewable source of carbon that can be converted into conventional solid, liquid and gaseous fuels.
Utilization forms: direct combustion, thermochemical conversion, biochemical conversion of hydrogen energy.
air energy
Air energy refers to the low-grade thermal energy contained in the air. It is a type of clean energy along with water energy, wind energy, solar energy, and tidal energy. The device that collects and utilizes air energy is called a heat pump, which is called air energy heat pump technology. , the fields involved include air-energy heat pump hot water field, air-energy heat pump heating field, air-energy heat pump drying field, etc. Usable equipment developed by air-energy heat pump technology include air-energy heat pump water heaters, air-energy heat pump heating equipment, air Energy heat pump dryer, etc.
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