"Solar Energy" Energy and Sustainable Development PPT Courseware 5

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"Solar Energy" Energy and Sustainable Development PPT Courseware 5

The growth of animals and plants and human activities cannot be separated from the sun. This glowing fireball has existed for 5 billion years. Do you know about the sun? Can humans obtain the energy they need from the sun, which is 150 million kilometers away from the earth?

1. The sun - a huge nuclear furnace

The sun is 150 million kilometers away from the earth, its diameter is about 110 times that of the earth, its volume is 1.3 million times that of the earth, its mass is 330,000 times that of the earth, and its core temperature is as high as 15 million degrees Celsius.

Inside the sun, hydrogen nuclei fuse at ultra-high temperatures, releasing huge amounts of nuclear energy. Hydrogen bomb explosions are happening every moment in the core of the sun, and the sun is like a huge "nuclear furnace."

The surface temperature of the sun is about 6000°C. The sun has been "burning" stably for nearly 5 billion years and can continue to "burn" for another 5 billion years.

2. The sun is a treasure house of human energy

Only one 500 millionth of the energy radiated outward by the sun is transmitted to the earth, and less than half of it is received by the earth. Sunlight has been shining on our earth for 5 billion years. The solar energy accumulated by the earth during these 5 billion years is the source of most of the energy we use today.

The solar energy that shines on the earth is very huge. The solar energy that shines on the earth in about 40 minutes is enough to support the energy consumption of human beings around the world for a year. It can be said that solar energy is truly inexhaustible and inexhaustible energy.

2. The sun is a treasure house of human energy

Only about one billionth of the energy radiated outward by the sun is transmitted to the earth.

Indirect utilization of solar energy

Coal - the food of contemporary industry

Petroleum - the blood of contemporary industry

Natural gas - the cleanest chemical energy

Combustible ice - a new energy source for the future

Biomass energy - a promising green energy

Solar energy is the most basic energy source on earth

Whether it is biomass energy, wind energy, or hydraulic, temperature difference and tidal energy, they are all forms of conversion of solar energy. The energy contained in fossil fuels also comes from the solar energy absorbed and utilized by living organisms in ancient times.

3. Utilization of solar energy

There are two main ways to directly utilize solar energy.

1. photothermal conversion

Use collectors to collect energy from sunlight to heat water and other substances. Realized the conversion of solar energy into internal energy.

2. Photoelectric conversion

Solar cells convert solar energy into electricity;

It is widely used in aviation, aerospace, transportation, communications and other fields.

4. Advantages and Disadvantages of Solar Energy

1. Advantages of solar energy

① Universality: Solar energy is widely distributed and easy to obtain.

②Cleanliness: Using solar energy is safe and does not pollute the environment

③Large quantity: Solar energy is very huge

④Permanence: Solar energy is inexhaustible and inexhaustible

2. Disadvantages of solar energy

①Unstable: changes with seasons and time, and is affected by weather conditions

②Weak intensity: The actual solar radiation power projected onto the earth's surface is small, and a large receiving area and collection and conversion equipment are required.

③Discontinuous: Every place can only receive solar radiation during the day

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For more information about the "Energy and Sustainable Development of Solar Energy" PPT courseware, please click the Energy and Sustainable Development ppt Solar Energy ppt tag.

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Update Time: 2024-11-14

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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