风能计算器
使用风能计算器评估特定地点的风力发电潜力。输入平均风速和涡轮参数，计算可利用风能功率和年发电量kWh，评估风电项目的可行性和经济效益。
Annual Energy Production
1,295 MWh
Annual Energy Production vs Rotor Diameter
公式
How to Calculate Wind Energy Production
Wind turbine energy output depends on wind speed, rotor size, and efficiency.
Formula
Power (W) = 0.5 * Air Density * Swept Area * Wind Speed^3 * Efficiency
Swept Area = pi * (Diameter/2)^2
Annual Energy = Power * 8,760 hours * Capacity Factor
The Betz limit caps theoretical efficiency at 59.3%. Modern turbines achieve about 40% (Cp = 0.4). Capacity factor accounts for variable wind conditions.
计算示例
An 80m rotor wind turbine in 7 m/s average wind with 35% capacity factor.
- 01Swept area: pi * (80/2)^2 = 5,027 m2
- 02Theoretical power: 0.5 * 1.225 * 5,027 * 7^3 * 0.4 = 423,096 W = 423 kW
- 03Annual energy: 423 * 8,760 * 0.35 = 1,296 MWh
- 04Homes powered: 1,296 / 10.5 = 123 homes
常见问题
What is capacity factor?
Capacity factor is the ratio of actual energy produced to theoretical maximum if the turbine ran at full power 24/7. Onshore wind averages 25-45%, offshore 40-55%.
Why does wind speed matter so much?
Power scales with the cube of wind speed (speed^3). Doubling wind speed increases power 8x. This is why turbine siting is critical.
How tall are modern wind turbines?
Modern onshore turbines have hub heights of 80-120 meters and rotor diameters of 80-170 meters. Offshore turbines can exceed 260m total height.