Photovoltaic system site analysis
The approximate center of the F-Lot parking lot has coordinates 39°57’12.88″ N latitude, 75°11’05.30″ W longitude. The coordinates are specified in degrees, minutes and seconds. Go to these coordinates in Google Earth (or equivalent). Investigate the site, identifying potential shading issues. Look south from the center of the lot, and at least 120° east and west of south to see where the potential problems are. The Google Earth’s view of the area may not include all of the new multi-story buildings to the south-east, such as the Evo tower. This is important, as these buildings will have a critical impact on morning sunlight.
Part 1. Perform a static shading analysis
1. Identify the critical features with the potential to generate shade on your solar array in F-lot. These are primarily local buildings. The best way to do this is visit the site and take your own data (see suggestions below) or use Solar Pathfinder data if it is available. Add the azimuth-altitude coordinates of the shading features to a spreadsheet table and graphically to December-June and June-December sun path diagrams generated using the F-lot latitude and longitude. 1. From my experience, take a lot of data points to get good results 2.See http://solardat.uoregon.edu/SunChartProgram.html, http:// www.builditsolar.com/SiteSurvey/site_survey.htm and http:// www.solarpathfinder.com/PF. It appears that the Theodolite iOS app ($5.99 App Store as of 1/18/16) will generate the azimuth/altitude data needed, but it has not been field-tested yet.
2. Add your static shading information to SAM 1. Investigate how shading information can be added to SAM 2. Follow the instructions in SAM Help (Photovoltaic Systems:Shading) to add your shading information 3. Verify the impact your shading input has using the monthly time-series profiles (with and without shading) in SAM.
Deliverables for Part 1 – These should be up on your group site by Tuesday, January 26 • Summary of goals and procedures in group Wiki • Azimuth-Altitude table of the edges of the shade-generating objects. Upload a properly documented spreadsheet file to your File Exchange. • Two sun path diagrams, each showing a line representing the shade-generating objects. Upload both diagrams to your File Exchange • SAM file with shading info in File Exchange. Include either “Week 2” or the date (DDMMYYYY) in the file title. • Side-by-side comparison of time-series monthly irradiance from SAM, with and without shading either in Wiki or File Exchange
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