blockAbsorbedRadiation

Absorbed radiation by window

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

Information

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

The absorbed radiation by exterior shades includes:

  1. the directly absorbed exterior radiation: AWin*uSha*(HDir+HDif)*(1-tau-rho)
  2. the indirectly absorbed exterior radiantion from reflection (angular part): AWin*uSha*HDir*tau*rho(IncAng)*(1-tau-rho)
  3. the indirectly absorbed of exterior irradiantion from reflection (diffusive part): AWin*uSha*HDif*tau*rho(HEM)*(1-tau-rho)
  4. the absorbed interior radiation is neglected.

The output is absRad[2, 1]

The absorbed radiation by interior shades includes:

  1. the absorbed exterior radiation (angular part): AWin*uSha*HDir*alpha(IncAng)
  2. the absorbed exterior radiation (diffusive part): AWin*uSha*HDif*alpha(HEM)
  3. the absorbed interior radiation (diffusive part): AWin*uSha*HRoo*(1-tau-rho)

The output is absRad[2, N+2]

The absorbed radiation by glass includes:

  1. the absorbed radiation by unshaded part (diffusive part): AWin*(1-uSha)*(HDif*alphaEx(HEM)+HRoo*alphaIn(HEM))
  2. the absorbed radiation by unshaded part (angular part from exterior source): AWin*(1-uSha)*HDir*alphaEx(IncAng)
  3. the absorbed radiaiton by shaded part (diffusive part): AWin*uSha*(HDif*alphaExSha(HEM)+HRoo*alphaInSha(HEM))
  4. the absorbed radiation by shaded part (angular part from exterior source): AWin*uSha*HDir*alphaExSha(IncAng)

The output is absRad[1, 2:N+1] = Part1 + Part2; absRad[2, 2:N+1] = Part3 + Part4

References

Components

TypeNameDefaultDescription
Modelica.Blocks.Interfaces.RealInputHRooDiffussive radiation from room
Modelica.Blocks.Interfaces.RealOutput[NSta]QAbsExtSha_flowAbsorbed interior and exterior radiation by exterior shading device
Modelica.Blocks.Interfaces.RealOutput[NSta]QAbsIntSha_flowAbsorbed interior and exterior radiation by interior shading device
Modelica.Blocks.Interfaces.RealOutput[N,NSta]QAbsGlaUns_flowAbsorbed interior and exterior radiation by unshaded part of glass
Modelica.Blocks.Interfaces.RealOutput[N,NSta]QAbsGlaSha_flowAbsorbed interior and exterior radiation by shaded part of glass
Modelica.Units.SI.Power[2,N + 2,NSta]absRadAbsorbed interior and exterior radiation. (absRad[2,1,iSta]: exterior shading device, absRad[1,2 to N+1,iSta]: glass (unshaded part), absRad[2,2 to N+1,iSta]: glass (shaded part), absRad[2,N+2,iSta]: interior shading device) with iSta being the state of the (electrochromic) window

Revisions

  • October 22, 2016, by Michael Wetter:
    Added range for loop variable for JModelica.
    Made units of HRoo final.
    Removed unused protected constants k, Interior and Exterior.
  • August 7, 2015, by Michael Wetter:
    Revised model to allow modeling of electrochromic windows. This is for issue 445.
  • January 21, 2015, by Michael Wetter:
    Changed initial algorithm to initial equation section and removed dublicate assignments. This is required for OpenModelica.
  • October 17, 2014, by Michael Wetter:
    Added missing each keywords in parameter declarations.
  • March 4, 2011, by Wangda Zuo:
    Removed 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.
  • 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.