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DEER TRAIL - 06/29/2004 through 06/29/2005

LOCATION DETAILS
Latitude:
N 39° 41’ 50”
Longitude:
W 104° 2’ 24”
Township:
4 S
Range:
59 W
Section:
18
Elevation (ft.):
5,226
Tower Type:
NRG Tilt-Up
Tower Height:
20 m (65.6 ft)
Vane Offset (deg):
+15°
Direction Basis:
Unknown


DATA DETAILS

June 29, 2004 through June 29, 2005:

The anemometer tower was installed on June 29, 2004. The site was approximately 5 miles north of the town of Deer Trail. The tower was located in the southeast corner of pasture on high ground. A number of ravines and waterways exist in the area, as well as knolls. The landscape consists of a mixture of pasture and cultivated fields. 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
Deer_Trail_0666_2004_0715_0803.txt
Deer_Trail_0666_2004_0803_0824.txt
Deer_Trail_0666_2004_0924_1104.A04 Deer_Trail_0666_2004_0924_1104.txt
Deer_Trail_0666_2004_1104_1202.A04 Deer_Trail_0666_2004_1104_1202.txt
Deer_Trail_0666_2004_1202_0203.A04 Deer_Trail_0666_2004_1202_0203.txt
Deer_Trail_0666_2005_0203_0314.A05 Deer_Trail_0666_2005_0203_0314.txt
Deer_Trail_0666_2005_0314_0405.A05 Deer_Trail_0666_2005_0314_0405.txt
Deer_Trail_0666_2005_0405_0412.A05 Deer_Trail_0666_2005_0405_0412.txt
Deer_Trail_0666_2005_0412_0607.A05 Deer_Trail_0666_2005_0412_0607.txt
Deer_Trail_0666_2005_0607_0629.A05 Deer_Trail_0666_2005_0607_0629.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 +15 degrees to the wind vane data. This corrected data and wind resource summary report are available here:

From both the UND data, an analysis of the wind resource report was developed using Windographer 1.13. For this data, an offset of +15 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:
6/29/2004 0:00
Height above ground (m)
20
Data Set Ends:
6/30/2005 0:00
Mean wind speed (mph)
12.51
Data Set Duration:
12 months
Median wind speed (mph)
11.51
Length of Time Step:
10 minutes
Min wind speed (mph)
0
Elevation (ft.):
5,226
Max wind speed (mph)
49.97
Calm threshold (mph):
0
Mean power density (W/m²)
176
Wind Power Coefficients
Mean energy content (kWh/m²/yr)
1,539
Power Density at 50m:
258 W/m²
Energy pattern factor
1.915
Wind Power Class:
2 (Marginal)
Weibull k
2.011
Wind Shear Coefficients
Weibull c (mph)

14.10
Power Law Exponent:
0.14
1-hr autocorrelation coefficient
0.811
Surface Roughness:
0.01 m
Diurnal pattern strength
0.084
Roughness Class:
0.780
Hour of peak wind speed
22
Roughness Description:
Rough Pasture
Mean turbulence intensity
0.157
Standard deviation (mph)
6.47
Coefficient of variation (%)
51.7
Frequency of calms (%)
1.58
Actual observations
52,552
Missing observations
152
Data completeness (%)
99.7

 

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
12.51
18.74
3.1
1.42
12,425
18.9
Bergey Excel-S
6.7
10
20
12.51
8.87
1.4
1.53
13,387
15.3
Bergey XL.1
2.5
1
20
12.51
3.49
4.31
0.21
1,877
21.4
Southwest Skystream 3.7
3.7
1.8
20
12.51
16.36
0
0.4
3,512
22.3
Southwest Whisper 500
4.5
3
20
12.51
18.73
3.64
0.71
6,173
23.5
Northern Power NW 100/20
20
100
25
12.91
28.78
0
13.3
116,273
13.3
Vestas V47 - 660 kW
47
660
65
14.75
13.24
0.52
142
1,245,570
21.5
GE 1.5s
70.5
1,500
80.5
15.20
16.91
4.24
291
2,552,769
19.4
Vestas V80 - 2.0 MW
80
2,000
100
15.67
15.87
2.15
482
4,218,181
24.1
GE 2.5xl
100
2,500
110
15.88
11.65
5.28
678
5,938,270
27.1

 

 

 

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