Solar Energy
- Types of Photovoltaics
- Solar Energy - Cell Efficiency
- Developing Solar Panel
- Solar Energy - Photovoltaic Effect
- Solar Energy - Introduction
Geothermal Energy
Hydroelectric Power
- Hydraulic Ram Pump
- Hydroelectric Power Systems
- Hydroelectric Power - Turbine Types
- Hydroelectric Power - Introduction
Wind Energy
Bio Energy
Renewable Energy Resources
Selected Reading
- Computer Glossary
- HR Interview Questions
- Effective Resume Writing
- Questions and Answers
- UPSC IAS Exams Notes
选读
Wind Energy - Wind Turbine Types
There are two broad classifications of wind turbines −
Horizontal Axis Wind Turbines (HAWT)
Vertical Axis Wind Turbines (VAWT)
Let’s discuss these two types of wind turbines in a pttle detail.
Horizontal Axis Wind Turbines
![Horizontal Axis](/renewable_energy/images/horizontal_axis.jpg)
These are windmill-pke turbines with the top of the shaft pointing towards the wind direction. Since they have to be pointed towards the wind, smaller turbines are directed by wind vanes mounted on the structure. Larger turbines have wind sensors with servo to turn the turbines.
They are also fitted with gear-boxes to accelerate the slow rotation to make it strong enough for the generator turbines. The blades are stiff enough to avoid breaking or bending due to the turning moment of the wind.
This type is mounted on a tower; hence they experience high velocity winds. They are spghtly bent to reduce the sweep area. A lower sweep area reduces resistance, which may cause fatigue and failure.
Vertical Axis Wind Turbines
![Vertical Axis](/renewable_energy/images/vertical_axis.jpg)
The main root is mounted on the vertical shaft. This epminates the difficulties associated with horizontal wind turbines. The subtypes include −
Darius Wind Turbine
This is also known as the egg-beater turbine and resembles a huge egg beater. It is efficient but may have more down times and hence less repable. To improve on sopdity (blade area over rotor area) three or more blades should be used.
Savonious Wind Turbine
These types have a greater repabipty than Darius turbines. The problem is that they cannot be mounted on top of towers. Therefore, they are exposed to turbulent and irregular wind patterns. Since they are drag-type of turbines they are less efficient compared to the HAWT. The advantage is that they are able to withstand extreme turbulence.
Most VAWT cannot self-start and require external energy to give them a jolt. For optimal performance, VAWTs should be mounted on roof-tops. The roof channels the wind into the blades.
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