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Wind Energy Technology Concepts
57.14%
1
Please read the document ‘Introduction to quiz’, which contains all the information you need to 1/1 point
solve the quiz questions.
Question 1.
What is the required rotor radius (blade length) of a fast-running horizontal-axis wind turbine?
© 60-70m
@® 70-80m
O 80-90m
© 90-100m
VY. conect
Given values
P=SMW=5-10°W
v= 10m/s
p= 1.225kgim>
We will use formula 1. P = 4 -p-4- V3 - C, respect to A.
From slides we can find values of C,
Cp = 0.45
P 5 = 2
yo Usrzasroras ~ 18140m
Wer
Now we can find rotor radius. 2.
3
What is the required rotor radius (blade length) of a slow-running horizontal-axis wind turbine with a
rotor of multiple blades?
© 60-70m
O 70-80m
© 80-90m
@® 90-100m
VY Correct
Given values
P=5MW=5-105W
v= 10mis
p= 1.225kgim*
We will use formula 1. P = «p+ A+ V>- C, respect to A.
From slides we can find values of C,
p 08 2
A= gscece = re oras = 27210m'
Ra 4 = ABE = 93m
What is the required swept area of a Darrieus wind turbine?
© 10000-15000m?
© 15000-20000m
@® 20000-25000m?
© 25000-30000m
VY. Conect
1/1 point
1/1 point Given values
P=SMW =5-10°W
v= 10mis
p= 1.225kgim*
We will use formula 1. P = 5 -p-A-V?- C, respect to A.
A= Te
From slides we can find values of C,
Gy =04
Calculate swept area
=P = sth 8 2
A> aspire ~ TaraasTooa ~ 20408m
4. What is the length of a blade of this Darrieus wind turbine assuming that the blades are shaped as. 0/1 point
circular arcs such that the swept area forms a circle?
© 80-120m
© 177217
© 243-280m
@ 401-450m
1 incorrect
From 3Q, we know that the A value is 20408”
To find the length of a blade, we need to find rotor radius using formula for R.
R=\/4
Now we can find the length of the blade using formula for L
5. What is the required area of the kite Agi if the lift coefficient is C,=1 and the glide ratio is 5? 1/1 point 6
What is the required area of the kite Agi ifthe lift coefficient is Cy:
© 331m
© 851m?
O 101m
@® 1904m?
© 563m"
© 1321m*
© 1863m?
@® 2204m*
SY Correct
Given values
P =SMW =5-10°W
v= 10mis
c=1
G
We will use formula 2, Cp = 4 + ite - Cy +
Gah
FOG.
Abite =
Use formula 1. in respect to A
A anrG
Insert the formula A in the formula for Agite
_ Gap
Akite > FaEpG PG,
And caleulate A yi
Adae = aastebioras ~ 204m?
and the glide ratio is 107
0/1 point 7,
1 Incorrect
Given values
P=SMW=5-10°W
= 10mis
We will use formula 2. C, = 4» 4u « C, - G? respect to $$A_{kite}.
= Gear
Aine = SPA
Use formula 1. in respect to A
Pp
A= apr
Insert the formula A in the formula for Ajie
Gane
Ante = EE GET
‘And caleulate Agire
What is the required length of a straight and rigid beam that vibrates with an amplitude of 10 m ina
plane perpendicular to the mean wind speed of 10 mis if you assume that the power coefficient is Cp
=0.1 and the machine must extract 5 MW? (peak-to-peak amplitude)
O 8m
O 82m
@ 816m
© 8163m
Vtncorect
G2 01. = apace l= aap
, change MW to W
0/1 point
