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"Utilization and Development of Energy" Energy and Life PPT Courseware 2
Humanity cannot live without energy
There are many types of energy. Coal, oil, natural gas, etc. are all substances buried underground that can provide energy. They are often called mineral energy.
Classification of energy
(1) Classify according to whether it is directly provided by nature
energy
Primary energy - energy directly provided by nature
(Coal, oil, wind, flowing water, etc.)
Secondary energy - energy produced from energy provided by nature
(gasoline, diesel, electricity, hydrogen energy, etc.)
(2) Classify according to whether it can be regenerated
energy
Renewable energy (water energy, wind energy, solar energy, biomass, etc.)
Non-renewable energy (coal, oil, natural gas, nuclear energy, etc.)
(3) Classification according to the perspective of energy utilization
Conventional energy - Energy that has been widely used
(vegetable fuels, coal, oil, natural gas, hydraulic power)
Unconventional energy sources - those that need to be developed before they can be widely used
(Solar energy, hydrogen energy, geothermal energy, tidal energy)
With the continuous development of human society, people's demand for energy is also constantly increasing.
At different stages of the development of human society, the proportions of various types of energy in total energy consumption are also different. Coal and oil account for a gradually decreasing share of total consumption due to pollution and non-renewability, while solar energy and nuclear energy gradually increase in total consumption due to their high energy and low pollution. As people's awareness of environmental protection increases, the proportion of clean energy will gradually increase.
Coal and oil are the two most widely used energy sources in the world.
Coal is formed by complex changes in woody plants buried underground.
Thinking: Our country is rich in coal resources, but they are mainly concentrated in the north. Do you know why?
In ancient times, northern my country had a warm and humid climate with dense forests. Due to crustal movements, a large number of lush plants were buried underground. After complex changes, coal was formed.
my country's coal resources are 1.5 billion tons. The exploitable life is only 20.6 years, which is much lower than the world average of 42.8 years.
Discussion: What are the advantages of nuclear power generation compared with coal power generation?
Since the fuel of nuclear power is nuclear fuel, the advantage compared to coal or oil is that there is no air pollution, no oil leakage and other problems. Its only drawback is the presence of radioactive contamination.
Solar radiation is the main source of energy on earth
The solar energy obtained on the earth every year is huge, evenly distributed, pollution-free, and is an inexhaustible renewable energy source.
There are three ways for humans to utilize solar energy: converting light energy into thermal energy, converting light energy into electrical energy, and converting light energy into chemical energy.
Thinking: What are the limitations of current solar energy applications?
The technology is complex, the equipment is expensive, it covers a large area, and it is greatly affected by weather and other factors, making large-scale utilization of solar energy still facing many difficulties.
Rational utilization and development of energy
Thinking: Why can’t hydrogen energy become a conventional energy source?
Advantages: high calorific value, no pollution, abundant resources (water)
Economics: It is necessary to produce large amounts of hydrogen from water. Currently, its development and utilization are restricted due to complex technology and high production costs.
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"Utilization and Development of Energy" Energy and Life PPT Courseware:
"Utilization and Development of Energy" Energy and Life PPT Courseware Teaching Objectives 1. Understand the relationship between energy, human survival and social development. 2. Know what energy is and its classification. 3. Know the significance of sustainable development. 4. Establish awareness of sustainable development and cultivate...