.Buildings.Fluid.SolarCollectors.BaseClasses.IAM

Information

Overview

This function computes the incidence angle modifier for solar insolation striking the surface of the solar thermal collector. It is calculated using Eq 555 in the EnergyPlus 7.0.0 Engineering Reference.

Notice

As stated in EnergyPlus7.0.0 the incidence angle equation performs poorly at angles greater than 60 degrees. This model outputs 0 whenever the incidence angle is greater than 60 degrees.

References

EnergyPlus 7.0.0 Engineering Reference, October 13, 2011.

Interface

function IAM
  input Modelica.Units.SI.Angle incAng "Incident angle";
  input Real B0 "1st incident angle modifer coefficient";
  input Real B1 "2nd incident angle modifer coefficient";
  output Real incAngMod "Incident angle modifier coefficient";
end IAM;

Revisions

• May 31, 2017, by Michael Wetter and Filip Jorissen:
  Change limits for incident angle modifier to avoid dip in temperature at shallow incidence angles.
  This is for issue 785.
• November 20, 2014, by Michael Wetter:
  Added missing protected keyword.
• May 22, 2012, by Wangda Zuo:
  First implementation.