•This chart shows the effect of the UDA factor on a variety of average wind conditions.
•The numbers inside the chart show the wind speed at the turbine. Blue is poor, green is satisfactory and red is excellent.
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Roof Effect Multiplier is calculated as:
Wind Speed at Turbine/Wind Speed for Undisturbed Air.
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Average
Wind Speed MPH
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0.5
|
1
|
1.5
|
2
|
2.5
|
3
|
3.5
|
|
8
|
4
|
8
|
12
|
16
|
20
|
24
|
28
|
|
9
|
4.5
|
9
|
13.5
|
18
|
22.5
|
27
|
31.5
|
|
10
|
5
|
10
|
15
|
20
|
25
|
30
|
35
|
|
11
|
5.5
|
11
|
16.5
|
22
|
27.5
|
33
|
38.5
|
|
12
|
6
|
12
|
18
|
24
|
30
|
36
|
42
|
|
13
|
6.5
|
13
|
19.5
|
26
|
32.5
|
39
|
45.5
|
|
14
|
7
|
14
|
21
|
28
|
35
|
42
|
49
|
|
15
|
7.5
|
15
|
22.5
|
30
|
37.5
|
45
|
52.5
|
|
16
|
8
|
16
|
24
|
32
|
40
|
48
|
56
|
|
17
|
8.5
|
17
|
25.5
|
34
|
42.5
|
51
|
59.5
|
|
18
|
9
|
18
|
27
|
36
|
45
|
54
|
63
|
|
19
|
9.5
|
19
|
28.5
|
38
|
47.5
|
57
|
66.5
|
|
20
|
10
|
20
|
30
|
40
|
50
|
60
|
70
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