What is the formula for calculating wind energy?

Introduction What is the formula for calculating wind energy? This formula is the famous “wind energy formula”: E=1/2 (ρtsυ3) where: ρ!——Air density (kg

What is the formula for calculating wind energy?

The above formula is the famous "wind energy formula":

E=1/2 (ρtsυ3)

In the formula: ρ!—— Air density (kg/ m 2);

υ——wind speed (m/s);

t——time (seconds);

S——transverse surface area (m2).

This is a formula often used in the use of wind energy. It can be seen from the wind energy formula that wind energy is mainly related to three factors: wind speed, area through which the wind passes, and air density. The relationship is as follows: (1) The size of wind energy (E) and the cube of wind speed (υ3) is proportional to. In other words, the main factor affecting wind power is wind speed.

(2) The magnitude of wind energy (E) is proportional to the area(s) crossed by the wind. For wind turbines, wind energy is directly proportional to the swept area of ​​the wind turbine rotor as it rotates. Given thatThe diameter of the wind turbine is generally used as the main parameter of the wind turbine, the size of wind power is proportional to the square of the diameter of the wind turbine.

(2) The magnitude of wind energy (E) is proportional to the density of air (ρ). Air density refers to the mass (in kilograms) of air contained per unit volume (m3). Therefore, when calculating wind energy, it is necessary to know the value of air density ρ. The ρ value of air density is related to air humidity, temperature and altitude and can be found from relevant information.

How many kilowatt hours of electricity a wind turbine can produce per hour

It depends on several factors

1 Wind turbine configuration

2. Wind situation

For example, if the diameter is 60 meters, when the wind speed is greater than 38 kilometers per hour, the power generation capacityElectricity can also reach 2,000 kilowatts

Generally speaking, level 3 winds are valuable for use. However, from an economic and reasonable point of view, wind speeds above 4 meters per second are suitable for electricity generation. According to measurements, a 55 kilowatt wind turbine has an output power of 55 kilowatts when the wind speed is 9.5 meters per second; when the wind speed is 8 meters per second, the power is 38 kilowatts when the wind speed is 6 meters; per second, only 16 kilowatts; and when the wind speed is 5 meters per second, it is only 9.5 kilowatts. It can be seen that the stronger the wind force, the greater the economic benefits.

As mentioned in the answer, only when the wind speed is greater than 4 meters/second can it have the value of generating electricity.

>The name of the enWind energy is equivalent to wind. speed and wave height at 10 meters on flat, open terrain. Terrestrial Physics Symptoms

Level meters/second kilometers/hour nautical miles/hour (meters)

0 Calm wind 0-0.2. <1 <1 - Calm, smoke going straight up

1 gentle wind0.3-1.5 1-5 1-3 0.1 Smoke can indicate wind direction

< p>2 Breeze 1.6-3.3 6-11 4-6 0.2 Leaves make a slight noise

3 Breeze 3.4- 5.4 12-19 7-10 0, 6 Leaves and twigs tremble

4 Zephyr 5.5-7.9 20-28 11-16 1.0 Dust and shredded paper rise and twigs tremble

5 Strong wind 8.0-10.7 29-38 17-21 2.0 Small branches swayed and there were small waves on the water

6 Strong wind 10.8-13.8 39-49 22-27 3.0 Large swaying branches and whirring power lines

7 Strong winds 13.9-17.1 50-61 28-33 4.0 The entire tree was shaking and it was difficult to walk against the wind

8 Strong winds 17.2-20.7 62-74 34-40 5.5 Branches broke and it was difficult to walk against the wind. Very strong resistance

9 Strong winds 20.8-24.4 75-88 41-47 7.0 Minor damage to buildings occurred

10 Strong winds 24.5 -28.4 89-102 48-55 9.0 Some trees were uprooted. Heavy damage to buildings

11 Storm 28.5-32.6 103-117 56-63 11.5 Rarely encountered, accompanied by significant damage

12 Hurricane 32.7?118?64 14.0< /p>

A megawatt-class wind turbine can produce approximately 1 kilowatt of electrical energy in one revolution.

A wind turbine is a device that converts wind energy into electrical energy. It mainly consists of blades, generators, mechanical components and electrical components. Composition of parts. According to the axis of rotation, wind turbines are mainly divided into two categories: horizontal axis wind turbines and vertical axis wind turbines. Currently, horizontal axis wind turbines occupy thedominant position in the market.

The principle of wind power generation is to use wind energy to drive the rotation of the blades of a wind turbine, and then use a speed multiplier to increase the rotation speed to to encourage the generator to produce electricity. According to current wind turbine technology, electricity production can begin at a breeze speed of around three meters per second (the breeze level).

Detailed information:

Small wind systems are very efficient, but they are not are not. just It consists of a generator head, but a small system with some technological content: wind turbine + charger + digital inverter. The wind turbine consists of a nose, a rotor, a tail and blades. Each part is important, and the functions of each part are as follows: The blades are used to receive wind energy.e and convert it into electrical energy through the nose; the tail allows the blades to always face the direction of the wind to obtain maximum wind energy; the rotor allows the nose to rotate flexibly to reach the tail has the function of adjusting the direction; the nose rotor is a permanent magnet and the stator winding cuts the magnetic lines of force to generate electrical power.

For a 1.5 MW wind turbine, the generator spins about 1,800 times per minute, generates 1,500 kilowatt hours of electricity per hour, and the turbine spins about 18 times per minute. This is directly related to the size of the unit. Generally speaking, level 3 winds are useful for use. However, from an economic and reasonable point of view, wind speeds above 4 meters per second are suitable for electricity generation.

According to measurements, a 55 kilowatt wind turbine has an output power of 55 kilowattswhen the wind speed is 9.5 meters per second; when the wind speed is 8 meters per second, the power is 38 kilowatts; wind speed When the wind speed is 6 meters per second, it is only 16 kilowatts; when the wind speed is 5 meters per second, it is only 9.5 kilowatts. It can be seen that the stronger the wind force, the greater the economic benefits.

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