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EEE463_Homework9_Solution_F07

# EEE463_Homework9_Solution_F07 - Solar radiation data are...

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Solar radiation data are available from the National Renewable Energy Laboratory (NREL) for various U.S. cities based on 30 years of measured data. You are to download the data for Phoenix from the National Solar Radiation Data Base (see http://rredc.nrel.gov/solar/ ); specifically, the 30-year (1961-1990) average of monthly solar radiation for each month. You are to graph the average monthly solar radiation for flat-plate collectors facing south at fixed tilts of 0°, latitude, and 90°, and two-axis tracking flat-plate collectors. In the end, you should have one plot with four curves versus the months of the year. Solution: Phoenix (WBAN 23183) 0 2 4 6 8 10 12 14 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Incident Solar (kW-hr/m²/day) 0° (flat) Lat (33.4°) 90° (vertical) 2-Axis

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Phoenix, July 21, Latitude Tilt, South Facing 0 200 400 600 800 1000 1200 200 300 400 500 600 700 800 900 1000 1100 1200 Time, AST (min) Solar Insolation (W/m²) Tracking Total Tilt Total (D+DS) Tilt Direct (D) Tilt Diffuse-Scatter (DS)
K.E. Holbert 10/13/2006 Phoenix Solar Insolation (kW·hr/m²·day) Horizontal (Flat) Vertical facing South Sun tracking
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