.IBPSA.ThermalZones.ReducedOrder.RC.BaseClasses.splitFacVal

Information

Calculates the ratio of the surface areas of a wall to the total wall area, unless the area is zero. It subtracts the wall area AExt for first entry in AArray and AWin for second entry in AArray unless AArray[1] and/or AArray[2] are not zero. This is done separately for each orientation. Consequently, the function gives an nRow x nCol array back as output. Each row stands for one area in AArray and each column for one orientation in AExt and AWin. The function is used to calculate the split factors for IBPSA.ThermalZones.ReducedOrder.RC.BaseClasses.ThermSplitter.

For internal gains, the calculation is:

SplitFac_i = AArray[i] /ATot

whereby ATot is the sum of AArray. To perform this, AExt and AWin can just be set to vectors of zeros with length 1. For solar radiation through windows, the window and wall area with the same orientation as the incoming radiation should be subtracted as these areas cannot be hit by the radiation. This needs to be done separately for each orientation and for exterior walls and windows only, according to:

SplitFac_i,k = (AArray[i] - AExt[k]) /(ATot - AExt[k] -AWin[k])

and

SplitFac_i,k = (AArray[i] - AWin[k]) /(ATot - AExt[k] - AWin[k])

respectively. For all other walls, the equation is:

SplitFac_i,k = AArray[i] /(ATot - AExt[k] - AWin[k])

Interface

function splitFacVal
  input Integer nRow "Number of rows";
  input Integer nCol "Number of columns";
  input Modelica.SIunits.Area[:] AArray "Vector of areas";
  input Modelica.SIunits.Area[nCol] AExt "Vector of exterior wall areas";
  input Modelica.SIunits.Area[nCol] AWin "Vector of window areas";
  output Real[nRow, nCol] splitFacValues "Split factor values for ThermSplitter";
end splitFacVal;

Revisions

December 15, 2015 by Moritz Lauster:
First Implementation.

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