blockTransmittedRadiation

Transmitted radiation through window

Extends from Buildings.HeatTransfer.Windows.BaseClasses.PartialRadiation.

Information

The model calculates the solar radiation through the window. The calculations follow the description in Wetter (2004), Appendix A.4.3.

The transmitted exterior radiation for window system includes:

  1. the transmitted diffusive radiation on unshaded part: AWin*(1-uSha)*HDif*tau(HEM)
  2. the transmitted direct radiation on no shade part: AWin*(1-uSha)*HDir*tau(IncAng)
  3. the transmitted diffusive radiation on shaded part: AWin*uSha*HDif*tauSha(HEM)
  4. the transmitted direct radiation on shaded part: AWin*uSha*HDir*tauSha(IncAng);

The outputs are QTraDif_flow = Part1 + Part3 and QTraDir_flow = Part2 + Part4.

References

Parameters

TypeNameDefaultDescription
Real[NSta]traCoeRooTransmitivity of the window glass for interior radiation without shading

Components

TypeNameDefaultDescription
Modelica.Blocks.Interfaces.RealOutput[NSta]QTraDif_flowTransmitted exterior diffuse radiation through the window. (1: no shade; 2: shade)
Modelica.Blocks.Interfaces.RealOutput[NSta]QTraDir_flowTransmitted exterior direct radiation through the window. (1: no shade; 2: shade)
Modelica.Units.SI.Power[NSta]QTraDifUns_flowTransmitted diffuse solar radiation through unshaded part of window
Modelica.Units.SI.Power[NSta]QTraDirUns_flowTransmitted direct solar radiation through unshaded part of window
Modelica.Units.SI.Power[NSta]QTraDifSha_flowTransmitted diffuse solar radiation through shaded part of window
Modelica.Units.SI.Power[NSta]QTraDirSha_flowTransmitted direct solar radiation through shaded part of window

Revisions

  • June 7, 2016, by Michael Wetter:
    Removed output QTra_flow and introduced instead QTraDif_flow and QTraDir_flow. This is for issue 451.
  • August 7, 2015, by Michael Wetter:
    Revised model to allow modeling of electrochromic windows. This is for issue 445.
  • March 13, 2015, by Michael Wetter:
    Changed initial algorithm to initial equation section to avoid a translation error in OpenModelica.
  • March 4, 2011, by Wangda Zuo:
    Remove the if-statement and integer function that can trigger events.
  • February 2, 2010, by Michael Wetter:
    Made connector uSha a conditional connector.
  • December 15, 2010, by Wangda Zuo:
    Separate transmittance and absorbance models from the window radiation model.
  • December 12, 2010, by Michael Wetter:
    Replaced record Buildings.HeatTransfer.Data.GlazingSystems with the parameters used by this model. This was needed to integrate the radiation model into the room model.
  • December 10, 2010, by Wangda Zuo:
    First implementation.