.BuildSysPro.BoundaryConditions.Solar.Utilities.CosI

Information

Function computing the cosine (cosI) of the angle of incidence at (t0 + t)

Hypothesis and equations

The function returns cosI[3] of the angle of incidence defined between the solar beam and surface normal. The output is of real type in the interval [0; 1]:

cosi = max(0,l*CosDir[1]+m*CosDir[2]+n*CosDir[3])

with:

• l=cos(s)
• m=sin(s)*sin(g)
• n=sin(s)*cos(g)

Bibliography

none

Instructions for use

none

Known limits / Use precautions

none

Validations

Validated function - Hassan BOUIA 03/2013

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Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : Hassan BOUIA, EDF (2013)
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Interface

function CosI
  input Modelica.Units.NonSI.Angle_deg azimut "Surface azimuth in degree";
  input Modelica.Units.NonSI.Angle_deg incl "Surface tilt in degree";
  input Real CosDir[3] "Sun's direction cosines";
  output Real cosi "Cosine of the angle of incidence";
end CosI;

Revisions

Hassan Bouia 03/2013 : Simplification de l'écriture et adaptation au nouveau modèle MeteoFile