Karjalv Posted June 27, 2014 Share Posted June 27, 2014 Hi!I'm assisting in a university research related to incidence angle modifiers and dye-sensitized solar cells. We're deciding whether or not to use PVsyst in a simulation related to the research. My question is how is the IAM calculated for the different radiation components (Dp, Bp, Ap)? In the case of isotropic diffuse radiation, I think the effect of the IAM should be included in the same integral with which the Dp component is calculated. Or is the IAM factor calculated afterwards? I didn't find a mention in the help -file about this. I did found this: Incident "effective" energy calculation- Reading one hour data on the Meteo file (Horizontal global irradiation, temperature, eventuallydiffuse irradiation and wind velocity).- If not available, computes diffuse irradiation with the Liu-Jordan correlation model,- If necessary, applies the horizon correction on the beam component,=> defined variables at this stage: GlobHor, DiffHor, BeamHor, T Amb, WindVel .- performs the transposition (global, diffuse, albedo irradiations) in the collector plane, using eitherHay or Perez model according to user's preference.This is done using solar angles at the middle of the time interval, calculated from project's site (notthe site of the meteo file).With explicitely given meteo files (TMY or own measurements), this could give not very reliableresults at early morning or evening, if the time properties of the meteo file are not properly defined (legal orsun time), or if latitudes of the two sites is very different.=> defined variables at this stage: GlobInc, BeamInc, DiffInc, DiffSInc, AlbInc ,- applies the shading factor (if near shadings defined) on the beam component,- applies the IAM factor on the beam component.=> defined variables at this stage: GlobIAM, GlobShd, GlobEff, DiffEff ,This leads to the so-called "Effective incident energy", i.e. the irradiation effectively reaching the PV cellsurface. The bolded part gave me the impression that the IAM doesn't affect the diffuse component at all.I'd like to confirm this so I'll know if we can use PVsyst in the research.Thank you for your efforts!BR,Vilppu Link to comment Share on other sites More sharing options...
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