FALCON - 06/29/2005 through 06/26/2006
LOCATION DETAILS |
Latitude: |
N 38.9717° |
Longitude: |
W 104.61783° |
Township: |
12 S |
Range: |
65 W |
Section: |
25 |
Elevation (ft.): |
7,197 |
Tower Type: |
NRG Tilt-Up |
Tower Height: |
20 m (65.6 ft) |
Direction Basis: |
Unknown |
DATA DETAILS
June 29, 2005 through June 26, 2006:
The anemometer tower was installed on June 29, 2005. The site was approximately 2.5 miles north of the town of Falcon. 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.
The data plug data was then combined and processed by UND. This data and wind resource summary report that summarizes the data are available here:
Wind Resource Summary
From the UND data, an analysis of the wind resource report was developed using Windographer 1.13. For this data, no offset was applied to the wind vane data as no there was no indication what the offset was. In addition, the UND data was processed to remove the data where the UND data quality flag indicated suspect wind speed or direction data. Windographer was then used to add in synthetic data to these intervals
with suspect data. The Windographer files
(with and without the data quality analysis) and the text versions of the data from the Windographer analysis are given below:
Highlights of the wind resource using the Windogrpaher analysis with the synthetic data in place us suspect data at this site for the entire data collection period are shown below:
Data Properties |
Variable |
Data Set Starts: |
6/29/2005 0:00 |
Height above ground (m) |
20 |
Data Set Ends: |
6/27/2006 0:00 |
Mean wind speed (mph) |
11.66 |
Data Set Duration: |
12 months |
Median wind speed (mph) |
10.62 |
Length of Time Step: |
10 minutes |
Min wind speed (mph) |
0 |
Elevation (ft.): |
7,197 |
Max wind speed (mph) |
48.88 |
Calm threshold (mph): |
0 |
Mean power density (W/m²) |
149 |
Wind Power Coefficients |
Mean energy content (kWh/m²/yr) |
1,305 |
Power Density at 50m: |
211 W/m² |
Energy pattern factor |
2.131 |
Wind Power Class: |
2 (Marginal) |
Weibull k |
1.852 |
Wind Shear Coefficients |
Weibull c (mph) |
13.12 |
Power Law Exponent: |
0.126 |
1-hr autocorrelation coefficient |
0.796 |
Surface Roughness: |
0.01 m |
Diurnal pattern strength |
0.142 |
Roughness Class: |
0.78 |
Hour of peak wind speed |
14 |
Roughness Description: |
Rough Pasture |
Mean turbulence intensity |
0.197 |
Note: The wind power density and wind power class at 50m are projections of the data from 20m. A surface roughness of 0.01 meters was assumed for this projection. This is equal to that of a rough pasture. This value was then used this to calculate the roughness class and the power law exponent shown above.
|
Standard deviation (mph) |
6.55 |
Coefficient of variation (%) |
56.2 |
Frequency of calms (%) |
0.47 |
Possible records |
52,272 |
Valid records |
51,681 |
Suspect observations |
591 |
Data completeness (%) |
98.9 |
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 |
11.66 |
26.00 |
2.85 |
1.16 |
10,200 |
15.5 |
Bergey Excel-S |
6.7 |
10 |
20 |
11.66 |
12.41 |
1.62 |
1.28 |
11,200 |
12.8 |
Bergey XL.1 |
2.5 |
1 |
20 |
11.66 |
4.59 |
3.97 |
0.18 |
1,600 |
17.8 |
Southwest Skystream 3.7 |
3.7 |
1.8 |
20 |
11.66 |
21.82 |
0 |
0.33 |
2,800 |
18.1 |
Southwest Whisper 500 |
4.5 |
3 |
20 |
11.66 |
26.00 |
3.47 |
0.59 |
5,100 |
19.5 |
Northern Power NW 100/20 |
20 |
100 |
25 |
12.03 |
35.84 |
0 |
10.7 |
94,000 |
10.7 |
Vestas V47 - 660 kW |
47 |
660 |
65 |
13.75 |
18.38 |
0.57 |
116 |
1,020,200 |
17.6 |
GE 1.5s |
70.5 |
1,500 |
80.5 |
14.17 |
23.84 |
3.94 |
234 |
2,047,200 |
15.6 |
Vestas V80 - 2.0 MW |
80 |
2,000 |
100 |
14.6 |
21.82 |
2.28 |
396 |
3,467,000 |
19.8 |
GE 2.5xl |
100 |
2,500 |
110 |
14.8 |
16.23 |
4.71 |
558 |
4,884,300 |
22.3 |
|
/Wind_Speed_Profile_300.png)
/Wind_Rose_300.png)
/Seasonal_Wind_Speed_Profile_300.png)
/Daily_Wind_Speed_Profile_300.png)