Energy From The Wind

Question 1

Describe the differences between HAWTs and VAWTs in regards to wind direction, speed and RPM

Answer 1

HAWT
* Wind Direction - Consistent
* Wind speed - High
* RPM - high

VAWT
* Wind direction - Any
* WInd speed - Low
* RPM - Low

Question 2

List the components of a wind turbine starting at the rotor

Answer 2

1. Blades
2. Hub
3. Low speed shaft
4. Gearbox
5. High speed shaft
6. Generator
7. Wind Vane and Anemometre
8. Tower and Nacelle

Question 3

Equation for Kinetic Energy

Answer 3

Ke = ½mv²

Question 4

Define what is meant by the Betz Limit and state the value

Answer 4

• The maximum amount of energy the winds Ke that can be converted into mechanical energy in a rotor
• Calculated to be 59.3%