Buildings.HeatTransfer.Windows.Examples

Information

This package contains examples for the use of models that can be found in Buildings.HeatTransfer.Windows.

Package Content

Name	Description
BoundaryHeatTransfer	Test model for the heat transfer at the window boundary condition
FixedShade	Test model for the fixed shade model
Overhang	This example tests the window overhang model
SideFins	This example demonstrates the use of side fins for a window
Window	Test model for the window

Buildings.HeatTransfer.Windows.Examples.BoundaryHeatTransfer

Information

Parameters

Type	Name	Default	Description
Area	A	1	Window surface area [m2]
Real	fFra	0.2	Fraction of frame, = frame area divided by total area
Boolean	linearizeRadiation	false	Set to true to linearize emissive power
DoubleClearAir13Clear	glaSys2		Parameters for glazing system
SingleClear3	glaSys1
TripleClearAir13ClearAir13Clear	glaSys3		Parameters for glazing system
DoubleClearAir13Clear	glaSys		Parameters for glazing system

Modelica definition

model BoundaryHeatTransfer 
  "Test model for the heat transfer at the window boundary condition"
  extends Modelica.Icons.Example;
  parameter Modelica.SIunits.Area A=1 "Window surface area";
  parameter Real fFra=0.2 
    "Fraction of frame, = frame area divided by total area";
  parameter Boolean linearizeRadiation = false 
    "Set to true to linearize emissive power";

  Buildings.HeatTransfer.Windows.ExteriorHeatTransfer extCon(A=A, fFra=fFra,
    linearizeRadiation=linearizeRadiation,
    absIRSha_air=glaSys.shade.absIR_a,
    absIRSha_glass=glaSys.shade.absIR_b,
    tauIRSha_air=glaSys.shade.tauIR_a,
    tauIRSha_glass=glaSys.shade.tauIR_b,
    haveExteriorShade=glaSys.haveExteriorShade,
    haveInteriorShade=glaSys.haveInteriorShade,
    vieFacSky=0.5) "Exterior convective heat transfer";
  Modelica.Blocks.Sources.Constant TOut(y(unit="K"), k=273.15) 
    "Outside air temperature";
  Modelica.Blocks.Sources.Constant TRooAir(k=293.15, y(unit="K")) 
    "Room air temperature";
  Modelica.Blocks.Sources.Ramp uSha(duration=1, startTime=0) 
    "Shading control signal";
  Modelica.Blocks.Sources.Constant vWin(k=1) "Wind speed";
  Buildings.HeatTransfer.Sources.PrescribedTemperature TOuts 
    "Outside air temperature";
  Buildings.HeatTransfer.Sources.PrescribedTemperature TRAir 
    "Room air temperature";

  parameter Buildings.HeatTransfer.Data.GlazingSystems.DoubleClearAir13Clear glaSys2(
    shade=Buildings.HeatTransfer.Data.Shades.Gray(),
    UFra=2,
    haveInteriorShade=false,
    haveExteriorShade=false) "Parameters for glazing system";
  parameter Buildings.HeatTransfer.Data.GlazingSystems.SingleClear3 glaSys1(UFra=2);
  parameter Buildings.HeatTransfer.Data.GlazingSystems.TripleClearAir13ClearAir13Clear
    glaSys3(UFra=1) "Parameters for glazing system";
  parameter Buildings.HeatTransfer.Data.GlazingSystems.DoubleClearAir13Clear glaSys(
    shade=Buildings.HeatTransfer.Data.Shades.Gray(),
    UFra=1.5,
    haveExteriorShade=true,
    haveInteriorShade=false) "Parameters for glazing system";
 Buildings.HeatTransfer.Radiosity.IndoorRadiosity radIn(
    final linearize=linearizeRadiation, final A=A) "Indoor radiosity";
protected 
  Buildings.HeatTransfer.Radiosity.RadiositySplitter radShaOut 
    "Radiosity that strikes shading device";
public 
  Buildings.HeatTransfer.Windows.BaseClasses.ShadingSignal shaSig(haveShade=true) 
    "Conversion for shading signal";
  Buildings.HeatTransfer.Sources.PrescribedTemperature TRAir1 
    "Room air temperature";
  Buildings.HeatTransfer.Sources.PrescribedTemperature TRAir2 
    "Room air temperature";
  Buildings.HeatTransfer.Sources.PrescribedTemperature TRAir3 
    "Room air temperature";
  Modelica.Blocks.Sources.Constant QAbsSW_flow(k=0) "Absorbed solar radiation";
  Modelica.Blocks.Math.MultiSum sumJ(nu=2) 
    "Sum of radiosity from construction to room model";
equation 
  connect(uSha.y, extCon.uSha);
  connect(TOuts.port, extCon.air);
  connect(TRooAir.y, TRAir.T);
  connect(extCon.vWin, vWin.y);
  connect(TOuts.T, TOut.y);
  connect(shaSig.y,radShaOut. u);
  connect(radIn.JOut, radShaOut.JIn);
  connect(shaSig.u, uSha.y);
  connect(radShaOut.JOut_2, extCon.JInUns);
  connect(radShaOut.JOut_1, extCon.JInSha);
  connect(radIn.heatPort, TRAir.port);
  connect(TRooAir.y, TRAir1.T);
  connect(TRooAir.y, TRAir2.T);
  connect(TRooAir.y, TRAir3.T);
  connect(TRAir1.port, extCon.glaUns);
  connect(TRAir2.port, extCon.glaSha);
  connect(TRAir3.port, extCon.frame);
  connect(TOut.y, extCon.TBlaSky);
  connect(TOut.y, extCon.TOut);
  connect(radIn.JIn, sumJ.y);
  connect(extCon.JOutUns, sumJ.u[1]);
  connect(extCon.JOutSha, sumJ.u[2]);
  connect(QAbsSW_flow.y, extCon.QSolAbs_flow);
end BoundaryHeatTransfer;

Buildings.HeatTransfer.Windows.Examples.FixedShade

Information

This model tests window overhang and side fins. There are three instances of sha. The first instance models an overhang, the second models side fins and the third has neither an overhang nor a side fin.

Parameters

Type	Name	Default	Description
ParameterConstructionWithWindow	conPar[4]		Construction parameters
DoubleClearAir13Clear	glaSys		Glazing system

Modelica definition

model FixedShade "Test model for the fixed shade model"
  extends Modelica.Icons.Example;

  Buildings.HeatTransfer.Windows.FixedShade sha[4](final conPar=conPar,
    azi=conPar.azi,
    each lat=weaDat.lat) "Shade model";
  Buildings.BoundaryConditions.WeatherData.ReaderTMY3 weaDat(
    filNam="modelica://Buildings/Resources/weatherdata/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.mos");
  Buildings.BoundaryConditions.SolarIrradiation.DirectTiltedSurface HDirTil(
    lat=weaDat.lat,
    til=Buildings.HeatTransfer.Types.Tilt.Wall,
    azi=Buildings.HeatTransfer.Types.Azimuth.S) "Direct solar irradiation";
  Modelica.Blocks.Routing.Replicator H(nout=4) "Replicator";
  Modelica.Blocks.Routing.Replicator incAng(nout=4) "Replicator";
  parameter Buildings.Rooms.BaseClasses.ParameterConstructionWithWindow conPar[4](
    each til=Buildings.HeatTransfer.Types.Tilt.Wall,
    each azi=Buildings.HeatTransfer.Types.Azimuth.S,
    each A=20,
    each hWin=1.5,
    each wWin=2,
    each glaSys=glaSys,
    redeclare Buildings.HeatTransfer.Data.OpaqueConstructions.Insulation100Concrete200
      layers,
    ove(
      wR={0.1,0.1,0,0},
      wL={0.1,0.1,0,0},
      gap={0.1,0.1,0,0},
      dep={1,1,0,0}),
    sidFin(
      dep={0,1,1,0},
      gap={0,0.1,0.1,0},
      h={0,0.1,0.1,0})) "Construction parameters";

  parameter Buildings.HeatTransfer.Data.GlazingSystems.DoubleClearAir13Clear glaSys 
    "Glazing system";
equation 
  connect(weaDat.weaBus, sha[1].weaBus);
  connect(weaDat.weaBus, sha[2].weaBus);
  connect(weaDat.weaBus, sha[3].weaBus);
  connect(HDirTil.weaBus, weaDat.weaBus);
  connect(HDirTil.H, H.u);
  connect(HDirTil.inc, incAng.u);
  connect(incAng.y,sha. incAng);
  connect(H.y,sha. HDirTilUns);
  connect(weaDat.weaBus, sha[4].weaBus);
end FixedShade;

Buildings.HeatTransfer.Windows.Examples.Overhang

Information

This example demonstrates the use of the overhang model. It calculates the fraction of total window area that is exposed to the sun.

A similar example of an overhang model with more basic components is implemented in Buildings.HeatTransfer.Windows.BaseClasses.Examples.Overhang.

Modelica definition

model Overhang "This example tests the window overhang model"
  extends Modelica.Icons.Example;
  Buildings.BoundaryConditions.WeatherData.ReaderTMY3 weaDat(filNam="modelica://Buildings/Resources/weatherdata/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.mos") 
    "Weather data";
  Buildings.HeatTransfer.Windows.Overhang ove(
    dep=1.2,
    gap=0.1,
    hWin=1.0,
    wWin=1.0,
    azi=Buildings.HeatTransfer.Types.Azimuth.S,
    wR=0.1,
    wL=0.1,
    lat=weaDat.lat) "Calculates fraction of window area exposed to the sun";
  Buildings.BoundaryConditions.SolarIrradiation.DirectTiltedSurface HDirTil(
    lat=weaDat.lat,
    til=Buildings.HeatTransfer.Types.Tilt.Wall,
    azi=Buildings.HeatTransfer.Types.Azimuth.S) "Direct solar irradiation";
equation 
  connect(weaDat.weaBus, ove.weaBus);
  connect(HDirTil.weaBus, weaDat.weaBus);
  connect(HDirTil.inc, ove.incAng);
  connect(HDirTil.H, ove.HDirTilUns);
end Overhang;

Buildings.HeatTransfer.Windows.Examples.SideFins

Information

This example uses the window sidefin model to calculate the fraction of total window area exposed to the sun.

For a detailed description of the model, see Buildings.HeatTransfer.Windows.SideFins. A similar example of can be found in Buildings.HeatTransfer.Windows.BaseClasses.Examples.SideFins.

Modelica definition

model SideFins 
  "This example demonstrates the use of side fins for a window"
  extends Modelica.Icons.Example;
  Buildings.BoundaryConditions.WeatherData.ReaderTMY3 weaDat(filNam="modelica://Buildings/Resources/weatherdata/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.mos") 
    "Weather data";
  Buildings.HeatTransfer.Windows.SideFins fin(
    h=0.2,
    hWin=1.0,
    wWin=1.0,
    dep=0.5,
    gap=0.1) "Outputs fraction of window area exposed to the sun";
  Buildings.BoundaryConditions.SolarIrradiation.DirectTiltedSurface HDirTil(
    lat=weaDat.lat,
    til=Buildings.HeatTransfer.Types.Tilt.Wall,
    azi=Buildings.HeatTransfer.Types.Azimuth.S) "Direct solar irradiation";
equation 
  connect(weaDat.weaBus, fin.weaBus);
  connect(HDirTil.weaBus, weaDat.weaBus);
  connect(HDirTil.inc, fin.incAng);
  connect(HDirTil.H, fin.HDirTilUns);
end SideFins;

Buildings.HeatTransfer.Windows.Examples.Window

Information

This model demonstrates the implementation of a window model. On the left hand side is a model for the combined convective and radiative heat transfer on the outside facing side of the window. In the top middle is the window model, and below is a model that computes the solar radiation balance of the window. Output of the solar radiation balance model are the absorbed solar heat flow rates, which are input to the heat balance models. On the right hand side are models for the inside surface heat balance. As opposed to the outside surface heat balance models, these models are implemented using separate components for the radiative balance and for the convective balance. This has been done to allow separating radiation from convection, which is required when the room model is used with room air heat balance models that use computational fluid dynamics.

Parameters

Type	Name	Default	Description
Area	A	1	Window surface area [m2]
Real	fFra	0.2	Fraction of frame, = frame area divided by total area
Boolean	linearize	false	Set to true to linearize emissive power
Angle	lat	0.34906585039887	Latitude [rad]
Angle	azi	0	Surface azimuth [rad]
Angle	til	1.5707963267949	Surface tilt [rad]
DoubleClearAir13Clear	glaSys

Connectors

Type	Name	Description
Bus	weaBus

Modelica definition

model Window "Test model for the window"
  extends Modelica.Icons.Example;
  parameter Modelica.SIunits.Area A=1 "Window surface area";
  parameter Real fFra=0.2 
    "Fraction of frame, = frame area divided by total area";
  final parameter Modelica.SIunits.Area AFra = fFra * A "Frame area";
  final parameter Modelica.SIunits.Area AGla = A-AFra "Glass area";
  parameter Boolean linearize = false "Set to true to linearize emissive power";
  parameter Modelica.SIunits.Angle lat=0.34906585039887 "Latitude";
  parameter Modelica.SIunits.Angle azi=0 "Surface azimuth";
  parameter Modelica.SIunits.Angle til=1.5707963267949 "Surface tilt";
  Buildings.HeatTransfer.Windows.Window window(
    A=A,
    fFra=fFra,
    glaSys=glaSys,
    linearize=linearize,
    til=til) "Window";
  Buildings.HeatTransfer.Windows.ExteriorHeatTransfer extCon(
    A=A,
    fFra=fFra,
    linearizeRadiation=linearize,
    absIRSha_air=glaSys.shade.absIR_a,
    absIRSha_glass=glaSys.shade.absIR_b,
    tauIRSha_air=glaSys.shade.tauIR_a,
    tauIRSha_glass=glaSys.shade.tauIR_b,
    haveExteriorShade=glaSys.haveExteriorShade,
    haveInteriorShade=glaSys.haveInteriorShade,
    vieFacSky=0.5) "Exterior convective heat transfer";
  Modelica.Blocks.Sources.Ramp uSha(duration=0.5, startTime=0.25) 
    "Shading control signal";
  Buildings.HeatTransfer.Sources.PrescribedTemperature TOuts 
    "Outside air temperature";
  Buildings.HeatTransfer.Sources.FixedTemperature      TRAir(T=293.15) 
    "Room air temperature";
  Buildings.HeatTransfer.Radiosity.IndoorRadiosity indRad(A=A) 
    "Model for indoor radiosity";
  Buildings.HeatTransfer.Sources.FixedHeatFlow fixedHeatFlow(Q_flow=0);
  parameter Buildings.HeatTransfer.Data.GlazingSystems.DoubleClearAir13Clear glaSys(
    shade=Buildings.HeatTransfer.Data.Shades.Gray(),
    haveExteriorShade=false,
    haveInteriorShade=true);
  Buildings.BoundaryConditions.SolarIrradiation.DirectTiltedSurface HDirTil(
    til=til,
    lat=lat,
    azi=azi);
  Buildings.BoundaryConditions.SolarIrradiation.DiffuseIsotropic HDifTilIso(
               til=til);
  Buildings.BoundaryConditions.WeatherData.ReaderTMY3 weaDat(
                                                        filNam=
        "modelica://Buildings/Resources/weatherdata/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.mos");
  Modelica.Blocks.Math.Gain HRoo(k=0.1) "Solar irradiation from room";
  Buildings.HeatTransfer.Windows.BaseClasses.WindowRadiation winRad(
    AWin=1,
    N=glaSys.nLay,
    tauGlaSol=glaSys.glass.tauSol,
    rhoGlaSol_a=glaSys.glass.rhoSol_a,
    rhoGlaSol_b=glaSys.glass.rhoSol_b,
    xGla=glaSys.glass.x,
    tauShaSol_a=glaSys.shade.tauSol_a,
    tauShaSol_b=glaSys.shade.tauSol_b,
    rhoShaSol_a=glaSys.shade.rhoSol_a,
    rhoShaSol_b=glaSys.shade.rhoSol_b,
    haveExteriorShade=glaSys.haveExteriorShade,
    haveInteriorShade=glaSys.haveInteriorShade);
  Buildings.BoundaryConditions.WeatherData.Bus weaBus;
protected 
  Modelica.Blocks.Math.Sum sumJ(nin=if glaSys.haveShade then 2 else 1) 
    "Sum of radiosity fom glass to outside";
public 
  Buildings.HeatTransfer.Windows.BaseClasses.ShadeRadiation intShaRad(
    thisSideHasShade=glaSys.haveInteriorShade,
    linearize=linearize,
    absIR_air=glaSys.shade.absIR_a,
    absIR_glass=glaSys.shade.absIR_b,
    tauIR_air=glaSys.shade.tauIR_a,
    tauIR_glass=glaSys.shade.tauIR_b,
    A=AGla) if 
     glaSys.haveShade "Interior shade radiation model";
public 
  Buildings.HeatTransfer.Windows.BaseClasses.ShadingSignal
                shaSig(haveShade=glaSys.haveInteriorShade) 
    "Conversion for shading signal";
protected 
  Buildings.HeatTransfer.Radiosity.RadiositySplitter
                              radShaOut "Radiosity that strikes shading device";
public 
  Buildings.HeatTransfer.Windows.InteriorHeatTransferConvective intShaCon(
    A=A,
    fFra=fFra,
    haveExteriorShade=glaSys.haveExteriorShade,
    haveInteriorShade=glaSys.haveInteriorShade) 
    "Model for interior shade heat transfer";
equation 
  connect(uSha.y, extCon.uSha);
  connect(uSha.y, window.uSha);
  connect(TOuts.port, extCon.air);
  connect(window.glaUns_a, extCon.glaUns);
  connect(window.glaSha_a, extCon.glaSha);
  connect(window.fra_a, extCon.frame);
  connect(extCon.JOutUns, window.JInUns_a);
  connect(extCon.JInUns, window.JOutUns_a);
  connect(extCon.JOutSha, window.JInSha_a);
  connect(extCon.JInSha, window.JOutSha_a);
  connect(fixedHeatFlow.port, indRad.heatPort);
  connect(winRad.QTra_flow,HRoo. u);
  connect(HRoo.y,winRad. HRoo);
  connect(HDifTilIso.H, winRad.HDif);
  connect(HDirTil.H, winRad.HDir);
  connect(HDirTil.inc, winRad.incAng);
  connect(winRad.QAbsGlaUns_flow, window.QAbsUns_flow);
  connect(winRad.QAbsGlaSha_flow, window.QAbsSha_flow);
  connect(weaDat.weaBus, weaBus);
  connect(weaBus, HDirTil.weaBus);
  connect(HDifTilIso.weaBus, weaBus);
  connect(TOuts.T, weaBus.TDryBul);
  connect(uSha.y, winRad.uSha);
  connect(weaBus.winSpe, extCon.vWin);
  connect(weaBus.TBlaSky, extCon.TBlaSky);
  connect(weaBus.TDryBul, extCon.TOut);
  connect(uSha.y, shaSig.u);
  connect(intShaRad.u, shaSig.y);
  connect(indRad.JOut, radShaOut.JIn);
  connect(radShaOut.JOut_1, intShaRad.JIn_air);
  connect(indRad.JIn, sumJ.y);
  connect(sumJ.u[2], intShaRad.JOut_air);
  connect(window.JOutUns_b, sumJ.u[1]);
  connect(intShaRad.JOut_glass, window.JInSha_b);
  connect(window.JInUns_b, radShaOut.JOut_2);
  connect(radShaOut.u, shaSig.y);
  connect(intShaRad.JIn_glass, window.JOutSha_b);
  connect(TRAir.port, intShaCon.air);
  connect(uSha.y, intShaCon.uSha);
  connect(intShaCon.TSha, intShaRad.TSha);
  connect(window.fra_b, intShaCon.frame);
  connect(window.glaUns_b, intShaCon.glaUns);
  connect(intShaCon.glaSha, window.glaSha_b);
  connect(intShaCon.QRadAbs_flow, intShaRad.QRadAbs_flow);
  connect(winRad.QAbsIntSha_flow, intShaRad.QSolAbs_flow);
  connect(winRad.QAbsExtSha_flow, extCon.QSolAbs_flow);
end Window;