| Project: | Weather Tool |
| Component: | Data Conversion |
| Category: | bug report |
| Priority: | critical |
| Assigned: | rpict |
| Status: | active |
Description
1) Import hourly weather data form meteonorm in weather tool like described at:
http://squ1.org/wiki/WeatherTool/Tutorial_CSV
2) If you look in Edit Hourly Data you see that the values for the Direct and the Diffuse radiation are exact the same as in the meteonorm file.
3) If you calculate the Global Horizontal Radiation with: I_global = I_direct * sin(sunangle) + I_diffuse
you get the same values as Meteonorm provides.
4) If you export the Global Horizontal Radiation from weather tool, the values are much higher. The formula seems to be: I_global = I_direct * cos(sunangle) + I_diffuse. So there is a cosine instead of a sinus.
Is this only a bug in weather tool, or has ecotect the same issue and all calculations are wrong?
-rpict
well, it seems that this is
well, it seems that this is only affecting the WeatherTools save as .csv option.
In Ecotect the Global Horizontal Radiation is calculated correct and the data values are matching the meteonorm ones.
-rpict