klerindias Posted March 14, 2013 Share Posted March 14, 2013 Hello,I imported data from PVGIS-SAF, PVGIS-Classic and from meteornom 6.I tried to do optimization of orientation for same geo localization: Berlin.And each tilt for each data is different why?PVGIS-CLASSIC:http://img832.imageshack.us/img832/8776/pvgisclassic.jpgPVGIS-SAF(1 deg azimuth but not influence on result):http://img203.imageshack.us/img203/1497/pvgissaf.jpgMETEONORM:http://img266.imageshack.us/img266/6007/meteornom601.jpg Link to comment Share on other sites More sharing options...
André Mermoud Posted March 19, 2013 Share Posted March 19, 2013 The transposition is highly dependent on the diffuse part. And the models for the diffuse are usually rather coarse. However the calculations in this tool are only meant for a quick evaluation when you are choosing an orientation. They are computed very quickly using a simplified algorithm based on the Montly meteo data (calculation of 3 average days for each month). Please don't use it for accurate evluations. The tool in "Tools" / "Transposition Factor" provides more accurate optimizations, evaluated on the basis of the hourly data, and for different conditions (different months, eventual horizon shading, etc). Link to comment Share on other sites More sharing options...
klerindias Posted April 23, 2013 Author Share Posted April 23, 2013 Hello, thanks for answer.But now i got new ones after i read your article.I did as you suggested Transposition Factor for Berlin.http://img89.imageshack.us/img89/4669/berlintf.jpgSo it showing optimum about 35.5 degree.Then i read about electrical shading effect and got like this:http://img442.imageshack.us/img442/8718/shelltiltoptimalization.jpgSo optimum should be about: 28-29 degree with pitch same like for 35.5 degree right?I dont exactly understand shading effect of cell 12.5 cm in 1 width, what it means?For landscape position, it means shade on all cells in one row so just 1 submodule shaded in half (10 cells/20 in submodule, 10 cells shaded in module)orFor portrait position, it means all submodules shaded so it would be like 2 cells/20 in submodule, 6 cells in module orsomething else?but still dont know which case it's estimating.my version is 5 and just using it from tool tab.Regards. Link to comment Share on other sites More sharing options...
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