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Variable Condition Pyrheliometer Comparisons

Variable Condition Pyrheliometer Comparisons. 11 th International Pyrheliometer Comparisons (IPC-XI) PMOD/WRC Tom Stoffel & Joe Michalsky 27 Sept – 15 Oct 2010. Acknowledgements. Afshin Andreas Ells Dutton Pete Gotseff Bev Kay Daryl Myers Don Nelson Ibrahim Reda Steve Wilcox

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Variable Condition Pyrheliometer Comparisons

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  1. Variable Condition Pyrheliometer Comparisons 11th International Pyrheliometer Comparisons (IPC-XI) PMOD/WRC Tom Stoffel & Joe Michalsky 27 Sept – 15 Oct2010

  2. Acknowledgements • Afshin Andreas • Ells Dutton • Pete Gotseff • Bev Kay • Daryl Myers • Don Nelson • Ibrahim Reda • Steve Wilcox • Radiometer Manufacturers

  3. Purpose • Working Group on Direct Solar Measurements: • Review commercially available windowed pyrheliometers relative to the BSRN goal of 3 W/m2 accuracy • Ells Dutton (US-NOAA, Chair) • Klaus Behrens (GER- DeutscherWetterdienst) • Patrick Fishwick (UK Met Office) • David Halliwell (Environment Canada) • Don Nelson (US-NOAA) • Tom Stoffel (US-NREL) • Steve Wilcox (US-NREL, VCPC Coordinator)

  4. Experiment Design Location: Solar Radiation Research Lab Golden, Colorado USA Measurement Reference: 3 All-Weather AHF Cavities (AWX) 1 Windowed AHF Test Instruments: 3 samples of each commercially available pyrheliometers. Data Collection: All readings were recorded in volts or ohms every 2 seconds, except the four cavities in W/m2 every 1 second

  5. VCPC Deployment

  6. VCPC 24 November 2008 – 1 September 2009 Data Elements 33 Pyrheliometer Signals 1 Ref Voltage (5mV) 1 Shorted Channel Wind Speed Wind Direction Air Temperature Relative Humidity Barometric Pressure Solar Zenith Angle

  7. VCPC 24 November 2008 – 1 September 2009 Data Elements 33 Pyrheliometer Signals 1 Ref Voltage (5mV) 1 Shorted Channel Wind Speed Wind Direction Air Temperature Relative Humidity Barometric Pressure Solar Zenith Angle Monthly Clear-Sky Comparisons with NREL Standard Group (Un-Windowed)

  8. VCPC Daily Maintenance (M-F & Sa?)

  9. VCPC Daily Maintenance (needed today!)

  10. VCPC 24 November 2008 – 1 September 2009

  11. VCPC 24 November 2008 – 1 September 2009 Daily Maintenance (M-F) Records

  12. VCPC 24 November 2008 – 1 September 2009 Joe’s Analyses…

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