Dear scientists, I had very confusing Issue in my PHD on PV generation long term yield, how do use units of angle of incidence in degrees or in radians?
I used isotropic irradiation model:
I used long term radiation data from PVGIS european data base, the angles is in degrees. for DNI and DHI, all data are given on horizontal plan, from TMY data base, so I used the following transformation equations to get the total in plan radiation using all angles in degrees and take absolute of any cosine or sine result in negative, unfortunately the total in plan radiation is less than PVGIS results by more than 27% less than European commissioning simulation calculations.
Dear sir, In the site they have a map to relocate your position and to use all necessary adjustments and location issues , I discovered error in coding is that cos in matlab deal with radians, I use instead now Cosd which deal with degrees that makes my calculations 14% more than the EU calculations then I read in thier site that they use 14% system losses to overcome different losses like aging reflection soiling etc …. So if this 14% considered my calculations will be exact identical to the site , I appreciate your response and appreciate your help million of thanks dear sir
- Badges
- Science topic
- Similar topics
- Linguistics
- Composition Studies
- Publication