Common use of Meteorology Clause in Contracts

Meteorology. Table 5-1 summarizes the meteorological measurements validated at 5-minute time resolution for the period 5/8/01-6/30/02. Parameters marked with an asterisk (*) were continuously measured (1 second frequency except barometric pressure and precipitation) with averaging to 5-minute intervals and calculations of 5-minute standard deviations performed by the datalogger. Parameter Units Sensor (all Climatronics) scalar mean wind speed at 10m* m/s 102083-G0-H0 anemometer vector wind speed at 10m m/s standard deviation of wind speed at 10m m/s unit vector wind direction at 10m* °N 102083-G0-H0 wind vane resultant vector wind direction at 10m °N ▇▇▇▇▇▇▇▇▇ standard deviation of wind direction at 10m deg ▇▇▇▇▇▇▇▇ sigma-theta at 10m deg temperature at 10 m* °C 100093 thermocouple standard deviation of temperature at 10m °C temperature at 2m* °C standard deviation of temperature at 2m °C temperature at 2m minus temperature at 10m °C standard deviation of temperature at 2m minus temperature at 10m °C relative humidity* % 102425 lithium chloride sensor standard deviation of relative humidity % solar radiation* W/m2 CM3 102318 pyranometer standard deviation of solar radiation W/m2 barometric pressure* hPa 102270-G3 barometer standard deviation of barometric pressure hPa total period precipitation* mm 100097-1-G0 tipping bucket maximum wind gust at 10m m/s 102083-G0-H0 anemometer time of maximum wind gust at 10m hh:mm CST wind direction of maximum wind gust at 10m °N 102083-G0-H0 wind vane Solar radiation was measured using a Climatronics CM3 102318 pyranometer and validated at 5-minute time resolution. The manufacturer-reported zero offset is less 15 W/m2 at 200 W/m2 thermal radiation. Using October – December 2002 hourly data, the average of the reported hourly standard deviation in solar radiation is 0.4 W/m2 for hours with negative solar radiation reported (nighttime conditions). Using three times this metric as a crude estimate for the MDL, the solar radiation MDL would be 1.2 W/m2. A DRI site audit in October 2002 included collocation of a continuously measuring ▇▇▇▇▇▇ Precision Spectral Pyranometer (PSP) which was installed near the site sensor with an exposure as close to that of the site sensor as possible. Nighttime data (1700 through 0500 CST) were excluded from the comparison since the sensors read zero within the measurement precision. Figure 5-1a shows the collocated hourly data. A reduced major axis regression yielded: Audit = (1.01 ± 0.02)× Site + (9.7 ± 7.3 W / m2 ) The slope us statistically indistinguishable form unity (95% CL) and the intercept is nearly zero compared to the typical range of daytime solar radiation. Collocated precision was 11.0 W/m2 (2.8%) for the 23 hours of daytime collocated data, which is less than the manufacturer-reported maximum zero offset of 15.0 W/m2 at 200 W/m2 thermal radiation. Barometric pressure was measured using a Climatronics 102270-G3 barometer and validated at 5-minute time resolution. The manufacturer-reported accuracy is less than ±0.1%. A DRI site audit in October 2002 included collocation of a continuously measuring Vaisala PBT101B Transducer. Figure 5-1b shows the collocated hourly data. A reduced major axis regression yielded: Audit = (0.98 ± 0.02)× Site + (23 ±14 The slope us statistically indistinguishable form unity (95% CL) and the intercept is nearly zero compared to the typical range of barometric pressure. Collocated precision was 1.6 mb (0.16%) for the 63 hours of collocated data, which is close to the manufacturer-reported accuracy of less than ±0.1%.