PROGRAM INFORMATION

WALSENBURG SOUTH

6/1/2010 through 6/7/2012

DATA DETAILS

June 1, 2010 through June 7, 2012:

This site used the 50m tower owned by the Colorado Energy Office that is intended for community wind projects. The anemometer tower was installed on June 1, 2010 and was removed on June 7, 2012.

Data was being collected using four (4) NRG #40 Anemometers and two (2) NRG #200P Wind Vanes, as follows:

• Anemometers
  1. 49.5 meters heading 300° on an NRG 43" offset standard boom
  2. 49.5 meters heading 215° on an NRG 43" offset standard boom
  3. 30.0 meters heading 260° on an NRG 43" offset standard boom
  4. 40.2 meters heading 258° on an NRG 43" offset standard boom
• Wind Vanes
  1. 48.5 meters heading 253° on an NRG 43" offset standard boom with the null point facing away from the tower
  2. 38.1 meters heading 150° on an NRG 43" offset standard boom with the null point facing away from the tower

There was also a temperature sensor at a height of 2.5 meters on a 6" boom, a voltmeter in the data logger box, and relative humidity at a height of 2 meters under the data logger box.

All sensors fed into an NRG Symphonie data logger. The certifications for the anemometers are as follows:

The data logger generated wind reports for each day. Using the Symphonie Data Retriever software, each day's data was complied into one large data file. A zipped file that contains all of the NRG data files and a text version of the aggregate data for all days are given below .

It is important to note that these raw files included the offsets for the wind vanes so no compensation is required.

Experienced users may also wish to download the site file used to process the raw data with the Symphonie Data Retriever software. You can find the site file here.

From this data, an analysis of the wind resource report was developed for entire data collection period using Windographer 2.46. No offset was applied to the wind vane data as none was needed. Since the data set contains data for two or more wind speed sensors at different heights above the ground, Windographer considered the wind shear relationship between different wind speed sensors to synthesize missing data for those wind speed sensors. A best fit using the power law profile was chosen to synthesize the data. Once the wind shear relation was chosen, a daily influence on the wind shear profile was considered so that in each time step where the wind speed is known at one height but not at a different height, Windographer estimated the unknown wind speed based on the best-fit wind shear profile for the appropriate hour of the day.

Using this data, an analysis of the wind resource report was developed using Windographer. For this analysis, a data quality analysis was performed on the data. This data was flagged for icing in two ways:

1. Any wind speed data (from any anemometer) where the wind speed was less than 1 m/s at a temperature less than 2°C for 4 hours or more was flagged and removed from the wind resource analysis calculations
2. Any wind direction data (from any wind vane) where the wind direction varied by less than 2 degrees at a temperature less than 2°C for 4 hours or more was flagged and removed from the wind resource analysis calculations .

The final summary report, the combined data files, and the Windographer files (with and without the data quality analysis) are given below:

• Walsenburg_South_3704_2010_0601_to_2012_0607_Summary_Report.pdf
• Walsenburg_South_3704_2010_0601_to_2012_0607_without_data_validation.windog
• Walsenburg_South_3704_2010_0601_to_2012_0607_without_data_validation.txt
• Walsenburg_South_3704_2010_0601_to_2012_0607_with_data_validation-flagged_data.windog
• Walsenburg_South_3704_2010_0601_to_2012_0607_with_data_validation-flagged_data.txt

Final Wind Resource Summary

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

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