Xcel Energy Comanche Station Instrument Descriptions and Histories


Model Measurement
Notes (below)
Units Install
Date
Removal
Date
Current
SN
Current
CF
LI-200 Global Horizontal W/m2 06/20/2007 - PY55712 9.62 W/m2/mV
Measured using a LICOR LI-200 Pyranometer mounted on an Irradiance Inc. Rotating Shadowband Radiometer (RSR). RSR mounted on the roof of a 10 foot tall building; LI-200 sensor height is approx. 13 feet above ground level.
LI-200 Diffuse Horizontal W/m2 06/20/2007 - PY55712 9.62 W/m2/mV
Measured using the above LI-200, when RSR band rotates every 30-seconds and blocks the sun.
(calc) Direct Normal W/m2 06/20/2007 - - FD = 1.0
Calculated using Global and Diffuse measurement.
CS215 Dry Bulb Temperature and Relative Humidity oC 06/20/2007 - - N/A
Outside air temperature and relative humidity inside in a naturally aspirated radiation shield mounted approx. 12 feet above ground level on roof.
03001 Wind Speed and Wind Direction m/s 06/20/2007 - - 0.75 m/s/Hz+0.2m/s
355 o/mV
Measured by an RM Young 3-cup anemometer and vane is mounted 10 meters above ground level on tower. Peak Wind Speed is also recorded, which is the maximum 5-sec anemometer reading during the 1-minute interval.
TB4 Precipitation Gauge (tipping bucket) mm 06/20/2007 - - 0.254 mm/count
The Hydrological Services TES525 tipping bucket precipitation gauge is mounted approx. 11 feet above ground level on the roof. The accumulated daily precipitation is also recorded.
(calc) Est. Pressure mBar 06/20/2007 - - -
The station pressure is calculated by the RSR datalogger program. This estimation is based on the site elevation and air temperature.
(calc) Zenith Angle o 06/20/2007 - - -
Solar zenith angle calculated by RSR datalogger program.
(calc) Azimuth Angle o 06/20/2007 - - -
Solar azimuth angle calculated by RSR datalogger program.
(calc) Airmass - 06/20/2007 - - -
Airmass (optical) and airmass (pressure corrected) calculated by RSR datalogger program.
- RSR Battery Voltage V 06/20/2007 - - -
The RSR Battery powers the datalogger and the shadowband, it is charged by a PV panel.
- CR1000 Temperature oC 06/20/2007 - - -
Temperature of CR1000 datalogger panel.
(calc) Direct Normal (Bird Estimated) W/m2 07/24/2007 - - -
Estimated Direct Normal using the Bird Clear Sky Model
Notes:
  • Data Sample rate is every 5 seconds with 1-minute average output.
  • The CR1000 is a table based operating system, data is converted from table to array format after datacollection, also any non-numeric values are converted to -99999.
  • The datalogger program runs using greenwich mean time (GMT), data is converted to Mountain Standard Time (MST) after datacollection.

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