Wind Turnines Flashcards
1
Q
How do u calculate the kinetic energy of mass of air
A
Ke = 1/2 mv2
2
Q
What is the unit for ke
A
Joules
3
Q
What is meant by the betz limit ?
A
The maxximum proportion of energy that can be extracted by the wind
It is 59.3%
4
Q
What is the maxximum efficiency of a modern day wind turbine
A
Between 25-45%
5
Q
What is the equation for energy extracted from the wind
A
Pout = 1/2 p A v3 COP
6
Q
Explain the relationship between power output and swept area of a HAWT
A
the power output is directly proportional to the swept area
7
Q
State the relationship between a wind turbine and wind speed
A
The pout increases with wind speed as pout is directly proportional to v3
8
Q
How do u calculate the mass of a new turbine
A
Mn = Mo x (BLn/BLo)3
