.Buildings.HeatTransfer.Windows.BaseClasses.AbsorbedRadiation

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

• Michael Wetter.
  Simulation-based Building Energy Optimization.
  Dissertation. University of California at Berkeley. 2004.

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.