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1. How is the wind formed?
The energy of the wind mainly comes from solar energy. When the radiation of the sun heats the air on the earth, the earth's atmosphere is not heated uniformly. When the temperature is high, the air rises, so a low pressure is formed on the surface; where the temperature is low, the air drops and forms on the surface. High pressure. A pressure gradient is formed between the high pressure and the low pressure, and the air flows from the high pressure zone to the low pressure zone to form a horizontally moving wind.
2, the wind is classified according to strength, which level can be divided into?
You must have heard a similar statement in the weather forecast, "Bohai Wind 6~7 to 4~5". The "level" mentioned here is the classification of wind according to strength, and is called "Puffo wind level". It divides the wind into 13 levels from 0 to 12 according to the wind speed. The higher the number, the faster the wind speed and the greater the energy carried in the wind.
In order to facilitate the recording, people also gave names to the 13 grades of wind: 0 is no wind, 1 is soft wind, 2 is light wind, 3 is breeze, 4 is zephyr, and 5 is breeze. Level 6 is strong wind, level 7 is blast, level 8 is strong wind, level 9 is gale, level 10 is squally, level 11 is storm, and level 12 is hurricane.
3. What are the characteristics of wind energy?
Let's take a look at the characteristics of wind energy: First, the amount of wind energy is huge. 2% of the energy radiated by the sun into the earth is converted into wind energy, which is a very large number.
The wind energy on the earth is about 274 billion kilowatts, of which about 20 billion kilowatts can be used. How large is this? It is 10 times the total amount of water energy that can be developed and utilized on the earth! The energy that the world burns every year, Less than 1% of the Earth's energy is supplied to wind energy at the same time.
The place with the strongest wind energy is not limited to this. Wind energy is renewable and can be said to be inexhaustible. In addition, wind energy is a clean energy source, and the wind energy utilization technology that people use today does not cause air pollution.
However, the effective use of wind energy is not easy, and it is difficult for people to face it.
First, the wind power density is low, which means that although the wind energy is large, it is difficult to concentrate on. Why do we say that there is more wind energy, but it is not concentrated? If we use fossil energy, it is enough to mine a coal mine or an oil field; if we use water energy, it is enough to build a hydropower station in a suitable place. Wind energy is everywhere, and it is difficult to concentrate them on them. Therefore, it is necessary to select a wind farm site to form a large-scale utilization.
Second, the wind energy is unstable, a strong wind, a small wind, almost no rules, making it difficult to control.
Third, the distribution of wind energy is very uneven. It takes a lot of technical means to make good use of wind energy.
4. In which areas is China's wind energy mainly distributed?
To measure whether a local wind energy resource is rich, we often use the concept of “wind power densityâ€, and its unit is “watt/square meterâ€.
If we draw a lot of wind energy resources on the map of China, we will see a very interesting picture: the northwest, northeast, north, and southeast regions are rich in wind energy resources, and the wind resources are scarce in the Central Plains and southwest and southeast regions. .
The total technology exploitability of China's wind energy resources is 700 million to 1.2 billion kilowatts. Mengdong, Mengxi, Xinjiang Hami, Gansu Jiuquan, Hebei Bashang, Jilin West, Jiangsu Coastal, Shandong Coastal and other areas are the most abundant wind energy resources in China. The potential development of wind energy resources above the level of 50 meters is about 1.85 billion kilowatts. It accounts for 77.7% of the nation's onshore wind energy resources.
5. How do people use wind energy to generate electricity?
The basic principle of wind power is simply to convert the kinetic energy of wind into mechanical energy and then convert mechanical energy into electrical energy.
Specifically, when the wind blows over the wind turbine blade, a pressure difference is formed on the front and back surfaces of the blade, and the wind wheel is driven to rotate, and the kinetic energy of the wind is converted into the mechanical energy of the wind wheel. The generator rotates under the driving of the wind wheel to generate electricity, which converts mechanical energy into electrical energy. The equipment that achieves this energy conversion is a wind turbine.
The power of a wind turbine is an indicator of the power generation capacity of a wind turbine. The greater the power, the stronger the power generation capability. Before the wind turbine reaches the rated power, its output power is proportional to the cube of the wind speed, so the wind speed is a key factor of wind energy resources.
However, the energy extracted from the wind can only be 59.6% of it, and generally less than 40%.
How to effectively use wind energy and achieve wind power integration and consumption
“It is not necessary to say that the literati’s pen and the “Spring Breeze and the South Bank of the Green River†and the “Creek Pond Light Wind†are full of poetic and artistic style. The kites that provide information for human beings, the windmills that provide power and the sails are all effective for human use. The masterpiece of wind energy is a clean energy compared to traditional fossil energy. The best way to use wind energy is to convert wind energy into electricity. In this issue, we will talk about the characteristics of wind energy and how people use wind energy to generate electricity. of.