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BURLINGTON - 06/07/2005 through 08/29/2006

LOCATION DETAILS
Latitude:
N 39° 17 ’ 24”
Longitude:
W 102° 15’ 4 ”
Township:
9 S
Range:
43 W
Section:
6
Elevation (ft.):
4,115
Tower Type:
NRG Tilt-Up
Tower Height:
20 m (65.6 ft)
Vane Offset (deg):
+0°
Direction Basis:
Unknown
Wind Explorer S/N:
0749


DATA DETAILS

June 7, 2005 through August 30, 2006:

The anemometer tower was installed on June 7, 2005. The site was approximately 1 mile southeast of the town of Burlington. The tower was situated in a large open area with cultivated fields on the north and east side of the tower. The terrain is flat with good exposure to south, east, and northeast winds. Trees and buildings about a mile to the north and northwest may impact the wind from these directions. All data was collected using an NRG #40 Anemometer and NRG #200 Wind Vane mounted on a tilt-up tower located on the landowner's property at a height of 20m. This equipment fed into an NRG Wind Explorer data logger. All data plugs were sent into the Governor's Energy Office and then to the University of North Dakota for analysis. All data plug files and text versions of these files are given below.

Raw Wind Data Files
NRG Data_Plug Files
Txt Files
Burlington_0749_2006_0116_0213.A06 Burlington_0749_2006_0116_0213.txt
Burlington_0749_2006_0213_0327.A06 Burlington_0749_2006_0213_0327.txt
Burlington_0749_2006_0327_0504.A06 Burlington_0749_2006_0327_0504.txt
Burlington_0749_2006_0504_0530.A06 Burlington_0749_2006_0504_0530.txt
Burlington_0749_2006_0530_0719.A06 Burlington_0749_2006_0530_0719.txt
Burlington_0749_2006_0719_0823.A06 Burlington_0749_2006_0719_0823.txt
Burlington_0749_2006_0823_0829.A06 Burlington_0749_2006_0823_0829.txt

It is important to note that these are the raw files without any compensation for offset. It is also important to note that the temperature was not recorded during this period.

For this data, UND applied an offset of +0 degrees to the wind vane data. This corrected data and wind resource summary report are available here:

From the UND data, an analysis of the wind resource report was developed using Windographer 1.13. For this data, an offset of +0 degrees was applied to the wind vane data. You can find the Windographer file below:

Wind Resource Summary

Highlights of the wind resource at this site for the entire data collection period are shown below:

Data Properties
Variable
Data Set Starts:
6/7/2005 0:00
Height above ground (m)
20
Data Set Ends:
8/30/2006 0:00
Mean wind speed (mph)
13.85
Data Set Duration:
14.8 months
Median wind speed (mph)
13.01
Length of Time Step:
10 minutes
Min wind speed (mph)
0
Elevation (ft.):
4,115
Max wind speed (mph)
56.38
Calm threshold (mph):
0
Mean power density (W/m²)
248
Wind Power Coefficients
Mean energy content (kWh/m²/yr)
2,169
Power Density at 50m:
364 W/m²
Energy pattern factor
1.923
Wind Power Class:
3 (Fair)
Weibull k
2.032
Wind Shear Coefficients
Weibull c (mph)

15.62
Power Law Exponent:
0.14
1-hr autocorrelation coefficient
0.849
Surface Roughness:
0.01 m
Diurnal pattern strength
0.088
Roughness Class:
0.780
Hour of peak wind speed
15
Roughness Description:
Rough Pasture
Mean turbulence intensity
0.154
Standard deviation (mph)
7.10
Coefficient of variation (%)
51.3
Frequency of calms (%)
1.07
Actual observations
64,512
Missing observations
144
Data completeness (%)
99.8

 

Windographer was used to match up the wind at this site with the performance curves of some common turbines of various sizes and various heights, allowing for losses of about 13%. The table below shows the results. For the larger turbines, the tower height was increased to account for the larger turbine blades - the wind resource was extrapolated to these higher heights. Keep in mind that the larger and the higher the turbine, the better the wind and the greater the output. But of course, as the tower heights and turbine sizes increase so does the cost.

Turbine
Rotor
Diameter
meters
Rotor
Power
kW
Hub
Height
meters
Hub
Height
Wind
Speed
mph
Time
At
Zero
Output
percent
Time
At
Rated
Output
percent
Average
Net
Power
Output
kW
Average
Net
Energy
Output
kWh/yr
Average
Net
Capacity
Factor
%
Bergey Excel-R
6.7
7.5
20
13.85
14.5
4.6
1.8
15,362
23.4
Bergey Excel-S
6.7
10
20
13.85
6.8
2.6
1.9
16,823
19.2
Bergey XL.1
2.5
1
20
13.85
2.8
6.7
0.3
2,324
26.5
Southwest Skystream 3.7
3.7
1.8
20
13.85
13.1
0
0.5
4,316
27.4
Southwest Whisper 500
4.5
3
20
13.85
14.4
5.7
0.9
7,516
28.6
Northern Power NW 100/20
20
100
25
14.29
22.6
0
17.1
150,174
17.1
Vestas V47 - 660 kW
47
660
65
16.33
10.3
1.5
176
1,544,554
26.7
GE 1.5s
70.5
1,500
80.5
16.83
13.6
6.9
365
3,193,430
24.3
Vestas V80 - 2.0 MW
80
2,000
100
17.35
12.6
4.2
588
5,152,216
29.4
GE 2.5xl
100
2,500
110
17.58
9.4
8.1
823
7,210,290
32.9

 

 

 

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